Sr00 Std Swo Hva Rep 0001

Sabic Riyadh Compound ProjectSt t P j t N 12706 00Stantec Project No. 12706.00

Cooling and HVAC System Options Report SR00-STD-SWO-HVA-REP-0001

06th S b 201206th September 2012

Sabic Riyadh Compound Kingdom of Saudi Arabia

Page 1

Table of Contents

1.0 Introduction 2

2.0 Discussion 3

3.0 Recommendations 11

Appendices

Appendix A Cooling and HVAC System Options Sketches

Appendix B Advantages and Disadvantages

Appendix C CAPEX and OPEX Comparisons

Appendix D Cooling Load and Cooling Tower Make-Up Water Estimates


Page 2

1.0 Introduction

Stantec has been requested to provide a Cooling and HVAC System Options Report (Report)

for the SABIC Riyadh Compound Project.

The Report reviews various feasible cooling and HVAC system options serving the residential

and non-residential components of Phase 1 and Phase 2, discusses their respective

advantages and disadvantages, makes CAPEX and OPEX comparisons and also provides

preliminary estimates on the cooling load and cooling tower make-up water, and makes

recommendations with supporting documentation included in the appendices.

The Report was submitted as a DRAFT Report for information purposes on September 3,

2012.

The FINAL Report is being submitted as part of the Building Services Concept Design for

review, comment and SABIC approval of the cooling and HVAC system recommendations and

which will form the design basis for the cooling and HVAC system and further specific and

detailed reviews.

(The criticality and operational prioritization of the building types / critical buildings will be

discussed and agreed with SABIC separately. At present, Stantec understands that

emergency cooling provisions could be provided for at a maximum of 24 hours continuous

operation to critical buildings.)


Page 3

2.0 Discussion

2.1 Cooling and HVAC System Options

Stantec has reviewed the following cooling and HVAC system options:

OPTION 1: Residential and Non-Residential – Water Cooled Chillers

OPTION 2: Residential and Non-Residential – DX

OPTION 3: Residential – Water Cooled Chillers

Non-Residential – DX

OPTION 4: Residential – DX

Non-Residential – Water Cooled Chillers

OPTION 5: Residential – DX

Non-Residential – DX

Schools – Air Cooled Chillers

XXX: Residential and Non-Residential – Air Cooled Chillers – Not Reviewed

XXX: Residential and Non-Residential – District Cooling – Not Available

Stantec has not reviewed air cooled chillers to provide cooling to the entire site as the space

requirements to implement the same would significantly reduce the usable site and also

impact masterplanning, and Stantec has not reviewed District Cooling as we understand that

existing chilled water provisions are not available at the site.

Please refer Appendix A for sketches indicating the residential and non-residential

components to Phase 1 and Phase 2, and sketches indicating the cooling and HVAC system

options.


Page 4

2.1.1 OPTION 1

OPTION 1 considers water cooled chillers to provide cooling to the residential and non-

residential components of Phase 1 and Phase 2. (Centralized.)

Water Cooled Chillers

Approximately 23,300 TR will be required in total to provide air conditioning to Phase 1 and

Phase 2, respectively.

Phase 1: 12,600 TR

Phase 2: 10,700 TR

The cooling system could either comprise independent / hydraulically decoupled chilled

water systems or a common chilled water system as necessary to facilitate construction

staging of Phase 1 and Phase 2. As such, the cooling system could be located to 2 x 75m x

35m independent Chiller Plantrooms or to a common 75m x 70m Chiller Plantroom with

cooling towers located to the roof level(s) of the Chiller Plantroom(s).

Chilled water will be provided by 10 x 2,500 TR centrifugal chillers, 10 x 3,125 THR cooling

towers, a 4,100 m3/day cooling tower make-up water storage tank, and chilled water will be

reticulated to the site via an n+1 primary-secondary hydraulically decoupled pumping

arrangement via a 1000mm diameter chilled water ring main at (say) 4.5 ºC and returned at

(say) 13.5 ºC. Heat exchangers and tertiary pumps will be provided as required to protect

the cooling system.

Emergency chilled water provisions could be provided to prioritized building types / critical

buildings for (say) 24 hours continuous operation. This will require a cooling tower make-up

water storage tank, and electrical generator and diesel fuel provisions.

Key advantages and disadvantages associated with OPTION 1 are highest CAPEX and high

OPEX / high owning expenditure. It also has the highest space requirements which reduces

usable site which consequently impacts masterplanning.

Considering the aforementioned and the low availability of potable water on site for the cooling

tower make-up water, OPTION 1 is excluded as a feasible cooling and HVAC system option

recommendation.


Page 5

The advantages and disadvantages associated with OPTION 1 are outlined in Appendix B

and the CAPEX and OPEX comparisons are outlined in Appendix C. (Stantec has

coordinated with the Quantity Surveyor on the CAPEX and OPEX comparisons.)

Refer appendices for additional supporting documentation.

2.1.2 OPTION 2

The SABIC Scope of Work – Concept, Feed and Detail Design Scope dated 1 August 2012

Clause 5.4 HVAC reads as follows:

“Architect / Engineer shall consider using packaged HVAC systems for the buildings. Split

units may be considered for small residential loads.”

OPTION 2 considers direct expansion (DX) to provide cooling to the residential and non-

residential components of Phase 1 and Phase 2. (De-centralized.)

DX Approximately 23,300 TR will be required in total to provide air conditioning to Phase 1 and

Phase 2.

Phase 1: 12,600 TR

Phase 2: 10,700 TR

VRV / split air conditioning systems will provide air conditioning to the Villas of Phase 1 and

Phase 2, and roof top packaged units (packaged units) and VRV / split air conditioning

systems will provide air conditioning to the Apartments and non-residential components of

Phase 1 and Phase 2.

Emergency cooling provisions could be provided to prioritized building types / critical

buildings. This will require electrical generator and diesel fuel provisions.

Key advantages and disadvantages associated with OPTION 2 are lowest CAPEX and low

OPEX / lowest owning expenditure. It also has low space requirements which increases

usable site.


Page 6

Considering the aforementioned, OPTION 2 is considered as a feasible cooling and HVAC

system option.


and the CAPEX and OPEX comparisons are outlined in Appendix C.


2.1.3 OPTION 3

OPTION 3 considers water cooled chillers to provide cooling to the residential components

of Phase 1 and Phase 2, and also considers DX to provide cooling to the non-residential

components of Phase 1 and Phase 2. (Centralized and de-centralized, respectively.)

Water Cooled Chillers Approximately 20,900 TR will be required in total to provide air conditioning to Phase 1 and

Phase 2, respectively.

Phase 1: 11,300 TR

Phase 2: 9,600 TR

As per OPTION 1, the cooling system could either comprise independent / hydraulically

decoupled chilled water systems or a common chilled water system as necessary to facilitate

construction staging of Phase 1 and Phase 2. As such, the cooling system could be located

to 2 x 75m x 35m independent Chiller Plantrooms or to a common 75m x 70m Chiller

Plantroom with cooling towers located to the roof level(s) of the Chiller Plantroom(s).


towers, a 3,700 m3/day cooling tower make-up water storage tank, and chilled water will be

reticulated to the site via an n+1 primary-secondary hydraulically decoupled pumping

arrangement via a 1000mm diameter chilled water ring main at (say) 4.5 ºC and returned at

(say) 13.5 ºC. Heat exchangers and tertiary pumps will be provided as required to protect

the cooling system.


Page 7




DX

Approximately 2,400 TR will be required in total, and packaged units and VRV / split air

conditioning systems will provide air conditioning to Phase 1 and Phase 2.

Phase 1: 1,300 TR

Phase 2: 1,100 TR



Key advantages and disadvantages associated with OPTION 3 are medium CAPEX and

lowest OPEX / low owning expenditure. It also has high space requirements which reduces

usable site which consequently impacts masterplanning. (Similar to OPTION 1.)

Considering the low owning expenditure and not-with-standing the low availability of potable

water on site for the cooling tower make-up water, OPTION 3 is considered as a feasible

cooling and HVAC system option.



Please refer appendices for additional supporting documentation.

2.1.4 OPTION 4

OPTION 4 considers DX to provide cooling to the residential components of Phase 1 and

Phase 2, and water cooled chillers to provide cooling to the non-residential components of

Phase 1 and Phase 2. (De-centralized and centralized, respectively.)


Page 8

DX

Approximately 20,900 TR will be required in total.

Phase 1: 11,300 TR

Phase 2: 9,600 TR

As per OPTION 2, VRV / split air conditioning systems will provide air conditioning to the

Villas of Phase 1 and Phase 2, and packaged units and VRV / split air conditioning systems

will provide air conditioning to the Apartments of Phase 1 and Phase 2.




Approximately 2,400 TR will be required to provide air conditioning to Phase 1 and Phase 2,

respectively.

Phase 1: 1,300 TR

Phase 2: 1,100 TR

The cooling system will be located to a common 35m x 35m Chiller Plantroom located

between Phase 1 and Phase 2 with cooling towers located to the roof level of the Chiller

Plantroom.


towers, a 450 m3/day cooling tower make-up water storage tank, and chilled water will be

reticulated to the site via an n+1 primary-secondary hydraulically decoupled or an n+1

variable speed primary pumping arrangement via a 350mm diameter chilled water ring main

at (say) 4.5 ºC and returned at (say) 13.5 ºC.





Page 9

Key disadvantages associated with OPTION 4 are high CAPEX and highest OPEX / highest

owning expenditure. Also, DX has low space requirements which increases usable site, and

the water cooled chillers will require approximately 25% of the OPTION 1 space requirements.

Considering the aforementioned, OPTION 4 is excluded as a feasible cooling and HVAC

system option.




Considering the aforementioned, OPTION 4 is excluded as a cooling and HVAC system option

recommendation.




2.1.5 OPTION 5

OPTION 5 considers DX to provide cooling to the residential and non-residential

components of Phase 1 and Phase 2, and air cooled chillers to provide cooling to the

schools of Phase 1 and Phase 2. (De-centralized.)

DX

Approximately 21,900 TR will be required in total to provide air conditioning to Phase 1 and

Phase 2 excluding the schools.

Phase 1: 11,900 TR

Phase 2: 10,000 TR

As per OPTION 2, VRV / split air conditioning systems will provide air conditioning to the

Villas of Phase 1 and Phase 2, and packaged units and VRV / split air conditioning systems


Page 10

will provide air conditioning to the Apartments and non-residential components of Phase 1

and Phase 2.



Air Cooled Chillers

Approximately 1,400 TR will be required in total with air cooled chiller capacities ranging

from 250 TR to 450 TR to provide air conditioning to the schools of Phase 1 and Phase 2.

Phase 1: 600 TR

Phase 2: 800 TR

All chillers will be local / located to the roof level of each school.

Chilled water will be provided by 4 x (say) 500 TR high efficiency screw chillers appropriately

de-rated at high ambient conditions, and chilled water will be reticulated to each school via

an n+1 variable speed primary pumping arrangement via a 250mm diameter chilled water

dropper at (say) 6.0 ºC and returned at (say) 12.0 ºC.

Emergency cooling provisions could be provided to prioritized schools or components

thereof. This will require electrical generator and diesel fuel provisions.

Key advantages and disadvantages associated with OPTION 5 are low CAPEX and medium

OPEX / medium owning expenditure. It also has the lowest space requirements which

increases usable site as the air cooled chillers serving the schools are located to above roof

level.

Considering the aforementioned, OPTION 5 is considered as a cooling and HVAC system

option recommendation.





Page 11

3.0 Recommendation

In the discussion above, Stantec has reviewed OPTIONS 1, 2, 3, 4 and 5 and based on the

same, OPTIONS 2, 3 and 5 are considered as feasible cooling and HVAC system options.

OPTION 2 provides the lowest CAPEX and low OPEX and hence, is the reference for final

review of the feasible cooling and HVAC system options.

OPTIONS 1 and 4 have been excluded owing to CAPEX and OPEX considerations.

3.1.1 Comparing OPTION 2 and OPTION 3

A distinct advantage of delivering chilled water to the villas is that the typical noise

associated with condensing units is removed from the villa common spaces, and relocated to

a central location where noise is not a concern.

The higher OPEX associated with OPTION 3 can be absorbed by higher utility charges to

the tenant, essentially negating the increase in costs.

A concern with the centralized approach for chilled water is that the chilled water ring main /

distribution loop provides a single point of failure for the cooling to all villas. In the

conventional DX system, one failure equates to one villa being without air conditioning. In

the chilled water approach, one failure equates to all villas being without air conditioning. In

the peak of Summer when the temperature is at approximately 46 degrees, a failure of the

cooling system would be well noticed by all occupants. Furthermore, maintenance to any

part of the chilled water ring main may require that all villas be without cooling for a period.

Also, the low availability of potable water on site for the cooling tower make-up water

associated with OPTION 3 is a negative consideration.

Stantec considers the lack of resilience / reliability associated with OPTION 3 a negative

consideration / makes OPTION 3 less attractive.


Page 12

3.1.2 Comparing OPTION 2 and OPTION 5

In our experience, the ventilation standard of ASHRAE 62-2007, requires a significant

percentage of outside air to be provided to the school / classroom spaces. The large

percentage of outside air, when considered with extreme ambient / weather conditions of

Riyadh, Kingdom of Saudi Arabia, may limit the effectiveness of conventional DX equipment

to perform the required cooling. Although our review considers conventional DX equipment,

the actual layout of the classroom spaces may require more significant control strategies to

manage the extreme weather conditions or part load conditions.

Alternatively, a chilled water system for a school could be readily adapted to both partial load

conditions and extreme weather conditions, assuming that the fresh air system is pre-

conditioned prior to mixing with the return air.

Although the chilled water system for the schools may require additional CAPEX and

increased costs in the yearly maintenance / OPEX, Stantec is confident that OPTION 5

would provide the appropriate comfort conditions to the schools under all weather conditions

throughout the year.

3.1.3 Cooling and HVAC System Recommendation

With regard to the comparisons between OPTION 2 and OPTION 3 and OPTION 2 and

OPTION 5, Stantec recommends OPTION 5.

OPTION 5 provides for resilience / reliability to all villas and the non-residential components

of Phase 1 and Phase 2, and also provides confidence that the appropriate comfort

conditions would be provided to the schools under all weather conditions throughout the

year.

If the additional OPEX associated with OPTION 5 could be / are passed on to the end-user

through increased tuition / school costs, then the additional initial investment for resilience /

reliability only represents an increase of SAR11,815,850 (CAPEX OPTION 5 – CAPEX

OPTION 2), or an increase of less than 1% (0.6%) of the OPTION 5 owning expenditure of

the cooling and HVAC system.

Furthermore, OPTION 5 will provide flexibility for the site during the entire life cycle of the

project.


Appendix A Cooling and HVAC System Options Sketches

Phase 1 and Phase 2 – Residential and Non-Residential

Option 1

Option 2

Option 3

Option 4

Option 5


Appendix B Advantages and Disadvantages

Cooling System

VRV, Split Air Conditioning and Chilled Water FCU Systems

Packaged, VAV and CAV AHU Systems

9/5/2012

Chilled Water System Type System Description Advantages Disadvantages Comments

Greater redundancy and opportunity to "load-share" across site as centralized

Requires cooling towers, condenser water circuits and chemical treatment, and respective controls and associated roof level space for cooling towers

Highest operating efficiency Requires cooling tower make-up water storage provisions / tank with make-up water connection

Centralized chilled water system, maintenance less challenging compared to de-centralized chilled water systems

Maintenance and large component replacement / access challenging

More reliable / fewer breakdowns likely as generally requires more maintenance

Impacts masterplan space planning

Larger capacity chillers, i.e. Fewer water-cooled chillers required compared to air-cooled chillers

Possible plume effect Plume reduction technologies are available to reduce plume effect

Suitable for larger cooling loads Legionella bacteria risk or possible algae growthCooling tower fans are likely to be more quiet compared to air-cooled chiller Longer lead times

SABICSABIC RIYADH COMPOUNDCHILLED WATER SYSTEM - ADVANTAGES AND DISADVANTAGES

REVISION A

OPTION 1

RESIDENTIAL AND NON-RESIDENTIAL - WATER COOLED CHILLERS (CENTRALIZED)

Refer Section 2.1.1 OPTION 1 for description of OPTION 1 and refer Appendix B for advantages and disadvantages of AHUs and FCUs. OPTION 1 considers water cooled chillers to provide cooling to the residential and non-residential components of Phase 1 and Phase 2. (Centralized.)


Approximately 23,300 TR will be required in total to provide air conditioning to Phase 1 and Phase 2, respectively.

Ph 1 12 600 TR condenser fans, located at distance from most of siteSay 20 year life cycle for water-cooled chillers with scheduled maintenance as located in Plantroom

AHU condensate recovery not feasible owing to site arrangement / horizontal distancesHighest CAPEX Coordinated with Quantity SurveyorHigh OPEX

Lowest CAPEX Coordinated with Quantity Surveyor

Lowest OPEX

Same advantages as OPTION 2 Same disadvantages as OPTION 2

Phase 1: 12,600 TRPhase 2: 10,700 TR

OPTION 2

RESIDENTIAL AND NON-RESIDENTIAL - DX (DE-CENTRALIZED)

Refer Section 2.1.2 OPTION 2 for description of OPTION 2 and refer Appendix B for advantages and disadvantages of pacjkaged and VRV / split air conditioning units.

OPTION 2 considers direct expansion (DX) to provide cooling to the residential and non-residential components of Phase 1 and Phase 2. (De-centralized.)

DX

Approximately 23,300 TR will be required in total to provide air conditioning to Phase 1 and Phase 2.

Phase 1: 12,600 TRPhase 2: 10,700 TR

OPTION 3

RESIDENTIAL - WATER COOLED CHILLERS (CENTRALIZED)NON-RESIDENTIAL - DX (DE-CENTRALIZED)

Refer Section 2.1.3 OPTION 3 for description of OPTION 3 and refer Appendix B for advantages and disadvantages of FCUs, and packaged and VRV / split air conditioning units.

OPTION 3 considers water cooled chillers to provide cooling to the residential components of Phase 1 and Phase 2 and also considers DX to

Medium CAPEX Coordinated with Quantity SurveyorLow OPEX

Same advantages as OPTION 2 Same disadvantages as OPTION 2

residential components of Phase 1 and Phase 2, and also considers DX to provide cooling to the non-residential components of Phase 1 and Phase 2. (Centralized and de-centralized, respectively.)


Approximately 20,900 TR will be required in total to provide air conditioning to Phase 1 and Phase 2, respectively.

Phase 1: 11,300 TRPhase 2: 9,600 TR

DX

Approximately 2,400 TR will be required in total, and packaged units and VRV / split air conditioning systems will provide air conditioning to Phase 1 and Phase 2.


Refer 2.1.4 OPTION 4 for description of OPTION 4 and refer Appendix B for advantages and disadvantages of VRV / split air conditioning units, and AHUs and FCUs.

OPTION 4 considers DX to provide cooling to the residential components

OPTION 4

RESIDENTIAL - DX (DE-CENTRALISED)NON-RESIDENTIAL - WATER COOLED CHILLERS (CENTRALIZED)

High CAPEX Coordinated with Quantity SurveyorHigest OPEX

of Phase 1 and Phase 2, and water cooled chillers to provide cooling to the non-residential components of Phase 1 and Phase 2. (De-centralized and centralized, respectively.) DX

Approximately 20,900 TR will be required in total.



Approximately 2,400 TR will be required to provide air conditioning to Phase 1 and Phase 2, respectively.


Chilled Water System Type System Description Advantages Disadvantages Comments

Low CAPEX Medium OPEX

Coordinated with Quantity Surveyor

No Legionella bacteria risk or algae growth Lower energy consumption efficiency at higher ambient temperaturesGenerally shorter lead times Requires more emergency generators to achieve emergency chiller water

provisionsDecentralized chilled water system, maintenance more challengingReduced redundancy and opportunity to "load-share" across site as de-centralizedPlantroom space without roof covering / screeningSay 15 year plant life with scheduled maintenance, and plant exposed to abrasive air environmentNoisier at higher ambient temperature, and may require acoustic treatment to reduce noise / noise local to schoolsCondenser coil performance likely to derate faster compared to cooling tower labyrinth systemSuitable for smaller applicationsLess reliable / more breakdowns likely

Refer 1.1.1 OPTION 5 for description of OPTION 5 and refer Appendix B for advantages and disadvantages of VRV / split air conditioning units, and AHUs and FCUs.

OPTION 5 considers DX to provide cooling to the residential and non-residential components of Phase 1 and Phase 2, and air cooled chillers to provide cooling to the schools of Phase 1 and Phase 2. (De-centralized.)

DX

Approximately 21,900 TR will be required in total to provide air conditioning to Phase 1 and Phase 2 excluding the schools.

Phase 1: 11,900 TRPhase 2: 10,000 TR

Air Cooled Chillers

Approximately 1,400 TR will be required in total with air cooled chiller capacities ranging from 250 TR to 450 TR to provide air conditioning to the schools of Phase 1 and Phase 2.

Phase 1: 600 TRPhase 2: 800 TR

OPTION 5

RESIDENTIAL - DX (DE-CENTRALIZED)NON-RESIDENTIAL DX (DE-CENTRALISED)SCHOOLS - AIR COOLED CHILLERS (DE-CENTRALIZED)

Same advantages as OPTION 4 Same disadvantages as OPTION 5 Not considered as a feasible OPTIONSpace requirements to implement would significantly reduce usable site and also impact masterplanning

Lowest CAPEX Existing chilled water provisions are not available on site Lowest OPEX

Centralized independent / hydraulically decoupled or common chilled water systems serving Phase 1 and Phase 2 to facilitate construction staging. Approximately 23,300 TR required in total.

Phase 1: 12,600 TRPhase 2: 10,700 TR

55 x (say) 500 TR High efficiency screw chillers derated at high ambient conditions. n+1 pumps to variable speed primary pumping arrangement. Emergency chilled water and power / diesel provisions for (say) 24 hours continuous operation to prioritized building types / critical buildings.

XXX

RESIDENTIAL AND NON-RESIDENTIAL - DISTRICT COOLING (CENTRALIZED)

Centralized independent / hydraulically decoupled or common chilled water systems serving Phase 1 and Phase 2 to facilitate construction staging. Approximately 23,300 TR required in total.

Phase 1: 12,600 TRPhase 2: 10,700 TR

Energy Transfer Station(s) (ETS) located near district cooling mains pipework accommodating heat exhangers and n+1 primary-secondary hydraulically decoupled pumping arrangement. ETS(s) would be designed to temperature and pressure drop requirements as per district cooling

XXX

RESIDENTIAL AND NON-RESIDENTIAL - AIR COOLED CHILLERS (CENTRALIZED)

to temperature and pressure drop requirements as per district cooling provider requirements.

9/5/2012

HVAC System Type System Description Advantages Disadvantages Comments

Lower installation cost Higher CAPEX Highest CAPEX depending on site infrastructure and scale, being confirmed with QS

Stand-alone HVAC system, higher reliability as dependent on electrical system only, and emergency cooling provisions by emergency power provisions only

Higher OPEX compared to FCUs if FCUs are served by water cooled chillers but comparable OPEX if chilled water system is air-cooled

For larger VRV HVAC systems, gradual / modular transfer of VRV HVAC system electrical loads to emergency generators possible and should result in lower emergency generator CAPEX and OPEX

Say 10 to 15 year life cycle for outdoor air-cooled condensing units as exposed to environment, and say 15 year life cycle for indoor fan coil units may result in mismatched life cycles of outdoor air-cooled condensing and indoor fan coil units

Local operation and control on heating and cooling simultaneously if 3 pipe Increased electrical works as compressor is local to outdoor air-cooled

VRV system comprises outdoor air-cooled condensing units, indoor fan coil units / evaporators, refrigerant pipework (2 or 3 pipe system), power and control cables, and local operation and control / centralized operation and control

SABICSABIC RIYADH COMPOUNDVRV, SPLIT AIR CONDITIONING AND CHILLED WATER FCU SYSTEMS - ADVANTAGES AND DISADVANTAGES

REVISION A

DX - Variable Refrigeration Volume System (VRV)

system installed or either heating or cooling if 2 pipe system installed,individual temperature control

condensing units

Centralized operation and control possible from centralized BMS Maintenance requires specialist / complex technologyAllows for full metering of power consumption Limited suppliersRequires power, controls, condensate drainage and outdoor air provisionsHigher quality assurance as reduced builders worksFault finding / diagnostics is simplePlantrooms not required / outdoor air-cooled condensing units easily located to roof level or floor level Single outdoor condensing unit can serve several indoor unitsModern solutionLower noiseShort lead timesLocal operation and control on heating and cooling, heat pump options for heating

Higher OPEX compared to FCUs if FCUs are served by water cooled chillers

Medium CAPEX depending on site infrastructure and scale

Single outdoor condensing unit can serve several indoor units (multi-split) Refrigeration tube pipe lengths are limitedComparible CAPEX to FCUs considering infrastructure and scaleLower CAPEX compared to VRV systemSmall size and flexibility for zoning individual roomsSimilar advantages to VRV systemLower CAPEX as chilled water from central / decentralized chilled water system

Higher installation cost Lowest CAPEX depending on site infrastructure and scale

Lower OPEX if chilled water system is water-cooled but comparable OPEX is chilled water system is air-cooled

Requires chilled water system and chilled water distribution system reticulated from site infrastructure

Chilled Water - Chilled Water Fan Coil Unit System (FCU) FCU system comprises indoor fan coil units, local run-out chilled water pipework served from central / decentralized chilled water system, power and control cables, and local operation and control / centralized operation and control

DX - Split Air Conditioning System Split air conditioning system comprises outdoor air-cooled condensing units, indoor fan coil units / evaporators, refrigerant pipework, power and control cables, and local operation and control / centralized operation and control

Local operation and control on heating and cooling, individual temperaturecontrol

Lower reliability as dependent on electrical and chilled water systems, andemergency cooling provisions requires emergency power and chilled water provisions

Centralized operation and control possible from centralized BMS Does not allow for full metering of power consumptionSay 15 year life cycle for indoor fan coil unit as not exposed to envirnoment Requires power, controls, condensate drainage and outdoor air provisions

as well as chilled waterReduced electrical works as only fan and controls are local Fault finding / diagnostics is less simpleMaintenance does not require a specialist / simple and understood technology

May require acoustic treatment

Proven and common solutionShort lead timesNumerous suppliers

9/5/2012

HVAC System Type System Description Advantages Disadvantages Comments

Stand-alone HVAC system, higher reliability as dependent on electrical system only, and emergency cooling provisions by emergency power provisions only

Higher CAPEX Being confirmed by QS

Centralized operation and control possible from centralized BMS Higher OPEX compared to VAV and CAV AHUs if they are served by water cooled chillers but comparable OPEX if chilled water system is air-cooled

Requires greater electrical infrastructure to the building compared to VAV and CAV AHUs

Allows for full metering of power consumptionRequires power, controls, condensate drainage and local outdoor air provisions

Say 10 to 15 year life cycle as exposed to environment

Fault finding / diagnostics is simple as diagnostics interface available Increased electrical works as compressor is local to outdoor air-cooled condensing units

DX - Packaged Unit (PU) AHU System Packaged Unit AHU system comprises outdoor air-cooled condensing units and indoor fan coil units / evaporators combined / packaged into a single unit

SABICSABIC RIYADH COMPOUNDPACKAGED, VAV AND CAV AHU SYSTEMS - ADVANTAGES AND DISADVANTAGES

REVISION A

Plantrooms not required / located to roof level or floor level Maintenance of compressors requiredNo refrigerant pipework Smaller compared to VAV and CAV AHUs resulting in more AHUs, suitable

for smaller applicationsLower noise Visible from adjacent buildings unless screenedShort lead times Serves smaller zonesSimilar advantages to VRV and split air conditioning systemsLower CAPEX compared to packaged AHUs Higher CAPEX with an expected short pay-back period compared to FCUs

or CAV AHUsHigher CAPEX depending on site infrastructure and scale / chilled water provisions, being confirmed with QS

Lower OPEX and higher energy consumption efficiency Higher installation costGreater airborne infection control Maintenance requires controls specialist Relative pressure regime can be maintained space-to-space and department-to-department

More complex controls

Improved air quality as return air is returned to AHU for UV sterilization and filtration

Larger shaft and ceiling space requirements

Appropriate filtration at AHU being EU3 (panel) and EU8 (bag) or greater if required

Reduced reliability as a single point of failure Single point of failure could be mitigated by appropriate equipment selection

Centralized HVAC system Reduced roof level or floor level space dependant on location of AHU Plantrooms

Departments or buildings can be isolated or "turned down" / set back when not occupied

AHUs have possibly longer lead times

Centralized operation and control possible from centralized BMS Increased local structural loading as heavier / largerIndividual temperature control if VAV Requires chilled water provisionsImproved air distribution over FCU located in bulkhead / hotel-type arrangement

Similar life cycle to packages AHUs unless located in an enclosed AHU Plantroom

Chilled Water - Variable Air Volume (VAV) and Constant Air Volume (CAV) AHU System

VAV and / or CAV AHUs located to either central roof level AHU Plantrooms / enclosures or decentralized satellite floor level Plantrooms with supply and return air ducted to / from floor levels

Central maintenance of AHU without disruption to occupied space when carrying out maintenanceMinimal hydronic equipment located in occupied spaceNoise located to roof level and at distance from occupied spaceVAV boxes approximately equal in flow capacity to fan coil units Cheaper condensate recovery opportunitiesRequires less electrical infrastructure at the buildingLarger compared to packaged AHUs resulting in fewer AHUs


Appendix C CAPEX and OPEX Comparisons Quantities Estimates – PRELIMINARY

Option 1

Option 2

Option 3

Option 4

Option 5

9/5/2012

RESIDENTIAL

# AHUs FCUs (TR)

NON-RESIDENTIAL

# AHUs FCUs(LPS)

RESIDENTIAL

# PUs VRV / Split Unit(TR)

NON-RESIDENTIAL

# PUs VRV / Split Unit(LPS)

RESIDENTIAL

# AHUs FCUs (TR)

NON-RESIDENTIAL


RESIDENTIAL


NON-RESIDENTIAL

# AHUs FCUs(LPS)

RESIDENTIAL


NON-RESIDENTIAL


SCHOOLS

# AHUs FCUs (LPS)

2.5 5000 2.0 2500 2.5 2500 2.0 5000 2.0 2500 7500

Unit Type A 1305.1 - 1631.4 - 1305.1 - 1631.4 - 1631.4 - - 12 hour occupancy

Unit Type B 253.4 - 316.8 - 253.4 - 316.8 - 316.8 - - 12 hour occupancy

Unit Type C 336.0 - 420.0 - 336.0 - 420.0 - 420.0 - - 12 hour occupancy

Unit Type D 886.8 - 1108.5 - 886.8 - 1108.5 - 1108.5 - - 12 hour occupancy

Unit Type E 874.2 - 1092.8 - 874.2 - 1092.8 - 1092.8 - - 12 hour occupancy

Boys School 6 3 12 7 12 7 6 3 4 2 12 hour occupancy

CommentsBuilding Type

SABIC

PHASE 1 (SAUDI)

REVISION A

OPTION 5RESIDENTIAL - DX

NON-RESIDENTIAL DXSCHOOLS - AIR COOLED CHILLERS

SABIC RIYADH COMPOUND

OPTION 1RESIDENTIAL AND NON-RESIDENTIAL - WATER COOLED CHILLERS

OPTION 2DX


NON-RESIDENTIAL - WATER COOLED CHILLERS

QUANTITIES ESTIMATES - PRELIMINARY

OPTION 3RESIDENTIAL - WATER COOLED CHILLERS

NON-RESIDENTIAL - DX

Boys School 6.3 - 12.7 - 12.7 - 6.3 - - 4.2 12 hour occupancy

Girls School - 9.8 - 19.7 - 19.7 - 9.8 - - 6.6 12 hour occupancy

Town Center - 2.7 - 5.4 - 5.4 - 2.7 - 5.4 - 16 hour occupancy

Men Recreation Center - 2.4 - 4.8 - 4.8 - 2.4 - 4.8 - 16 hour occupancy

Women Recreation Center - 2.1 - 4.2 - 4.2 - 2.1 - 4.2 - 16 hour occupancy

Juma Mosque - 3.6 - 7.2 - 7.2 - 3.6 - 7.2 - 16 hour occupancy

Local Mosques - 2.0 - 3.9 - 3.9 - 2.0 - 3.9 - 16 hour occupancy

Town Center Mosques - 1.4 - 2.7 - 2.7 - 1.4 - 2.7 - 16 hour occupancy

Labor Accommodation 27.0 - 33.8 - 27.0 - 33.8 - 33.8 - - 12 hour occupancy

Security Gate House 3.0 - 3.8 - 3.0 - 3.8 - 3.8 - - 24 hour occupancy

Total 3685 30 4607 61 3685 61 4607 30 4607 28 11

RESIDENTIAL

# AHUs FCUs (TR)

NON-RESIDENTIAL

# AHUs FCUs(LPS)

RESIDENTIAL


NON-RESIDENTIAL


RESIDENTIAL

# AHUs FCUs (TR)

NON-RESIDENTIAL


RESIDENTIAL


NON-RESIDENTIAL

# AHUs FCUs(LPS)

RESIDENTIAL


NON-RESIDENTIAL


SCHOOLS

# AHUs FCUs (LPS)

2.5 5000 2.0 2500 2.5 2500 2.0 5000 2.0 2500 7500

Unit Type A 66.5 - 83.2 - 66.5 - 83.2 - 83.2 - 12 hour occupancy

Unit Type B 271.0 - 338.8 - 271.0 - 338.8 - 338.8 - 12 hour occupancy

Unit Type C - - - - - - - - - - OMITTED FROM SCOPE

Unit Type D (All Units) 90.6 - 113.2 - 90.6 - 113.2 - 113.2 - 12 hour occupancy

Comments



PHASE 1 (EXPAT)





Building Type


OPTION 2DX

yp ( ) p y

Unit Type E (All Units) 64.3 - 80.4 - 64.3 - 80.4 - 80.4 - 12 hour occupancy

Unit Type F-1 167.0 - 208.8 - 167.0 - 208.8 - 208.8 - 12 hour occupancy

Unit Type F-2 160.8 - 201.0 - 160.8 - 201.0 - 201.0 - 12 hour occupancy

Kindergarten (Boys and Girls) - 0.7 - 1.4 - 1.4 - 0.7 - 1.4 - 12 hour occupancy

Club House / Recreation Center - 2.1 - 4.2 - 4.2 - 2.1 - 4.2 - 16 hour occupancy


Total 822 3 1027 6 822 6 1027 3 1027 6 0

RESIDENTIAL

# AHUs FCUs (TR)

NON-RESIDENTIAL

# AHUs FCUs(LPS)

RESIDENTIAL


NON-RESIDENTIAL


RESIDENTIAL

# AHUs FCUs (TR)

NON-RESIDENTIAL


RESIDENTIAL


NON-RESIDENTIAL

# AHUs FCUs(LPS)

RESIDENTIAL


NON-RESIDENTIAL


SCHOOLS

# AHUs FCUs (LPS)

2.5 5000 2.0 2500 2.5 2500 2.0 5000 2.0 2500 7500

Unit Type A 1412.5 - 1765.6 - 1412.5 - 1765.6 - 1765.6 - - 12 hour occupancy

Unit Type B 391.7 - 489.6 - 391.7 - 489.6 - 489.6 - - 12 hour occupancy

Unit Type C 581.1 - 726.4 - 581.1 - 726.4 - 726.4 - - 12 hour occupancy

Unit Type D 772.6 - 965.8 - 772.6 - 965.8 - 965.8 - - 12 hour occupancy

Unit Type E 676.8 - 846.0 - 676.8 - 846.0 - 846.0 - - 12 hour occupancy

Boys School - 8.5 - 17.1 - 17.1 - 8.5 - - 5.7 12 hour occupancy

Girls School - 12.0 - 24.0 - 24.0 - 12.0 - - 8.0 12 hour occupancy


OPTION 2DX







Comments

PHASE 2

Building Type

Town Center - 1.2 - 2.4 - 2.4 - 1.2 - 2.4 - 16 hour occupancy

Men Recreation Center - 2.3 - 4.5 - 4.5 - 2.3 - 4.5 - 16 hour occupancy

Women Recreation Center - 2.0 - 3.9 - 3.9 - 2.0 - 3.9 - 16 hour occupancy

Local Mosques - 3.4 - 6.8 - 6.8 - 3.4 - 6.8 - 16 hour occupancy


Total 3837 29 4796 59 3837 59 4796 29 4796 18 14

PHASE 1 (SAUDI) 3685 30 4607 61 3685 61 4607 30 4607 28 11

PHASE 1 (EXPAT) 822 3 1027 6 822 6 1027 3 1027 6 0

PHASE 1 - Total 4507 33 5634 66 4507 66 5634 33 5634 34 11

PHASE 2 - Total 3837 29 4796 59 3837 59 4796 29 4796 18 14

Total 8344 62 10430 125 8344 125 10430 62 10430 51 24



RESIDENTIAL

# PUs VRV / Split Units

NON-RESIDENTIAL

# AHUs FCUs

Comments

TOTALS

RESIDENTIAL

# PUs VRV / Split Unit

RESIDENTIAL




SCHOOLS

# AHUs FCUs

Phase

NON-RESIDENTIAL

# PUs VRV / Split Unit

RESIDENTIAL

# AHUs FCUs

NON-RESIDENTIAL

# AHUs FCUs

NON-RESIDENTIAL


RESIDENTIAL

# AHUs FCUs

NON-RESIDENTIAL



OPTION 2DX



OPTION 1 OPTION 2 OPTION 3 OPTION 4 OPTION 5

RESIDENTIAL AND NON-RESIDENTIAL - WATER COOLED CHILLERS DX RESIDENTIAL - WATER COOLED CHILLERS

NON-RESIDENTIAL - DXRESIDENTIAL - DX


RESIDENTIAL - DXNON-RESIDENTIAL DX

SCHOOLS - AIR COOLED CHILLERS

SAR / Unit 4500000 0 4500000 2300000 950000

SAR 45000000 0 40500000 4600000 3800000

SAR / Unit 2530000 0 2530000 1300000 0

SAR 25300000 0 22770000 2600000 0

SAR / Unit 660000 0 660000 350000 230000

Allows for supply and installation including electrical requirements

ParametersCooling and HVAC System Options

Water - Cooling Towers

SABIC

Comments


9/5/2012REVISION A

Water - Chillers Allows for supply and installation including electrical requirements to water cooled and air cooled chillers

1. CAPITAL EXPENDITURE ESTIMATE - CAPEX

COOLING AND HVAC SYSTEM OPTIONS - CAPEX AND OPEX COMPARISONS - PRELIMINARY

SAR / Unit 660000 0 660000 350000 230000

SAR 6600000 0 5940000 700000 920000

SAR / Unit 1250000 0 1250000 350000 0

SAR 6250000 0 5000000 700000 0

SAR / Unit 1250000 0 1250000 720000 0

SAR 12500000 0 11250000 1440000 0

SAR

SAR

23040000

43550000

0

Allows for OPTION 1: 4,000m of 500mm diameter branch pipework from mains to outside villas and non-residential buildings at SAR5,000/m installed + 1,110 villas x SAR5,000/villa for run-out pipework from branch pipework to inside villas including meters + 24 non-residential buildings x SAR750,000/building for run-out pipework from branch pipework to floor levels inside non-residential buildings including meters / OPTION 2: - / OPTION 3: 3,500m of 500mm diameter branch pipework from mains to outside villas at SAR5,000/m installed + 1,110 villas x SAR5,000/villa for run-out pipework from branch pipework to inside villas including meters / OPTION 4: 1,000m of 400mm diameter branch pipework from mains to outside non-residential buildings at SAR4,000/m installed + 24 non-residential buildings x SAR 750,000/building for run-out pipework from branch pipework to floor levels inside non-residential buildings including meters /

Allows for heat exchangers and tertiary pumps to OPTIONS 1 and 4 / minor local costs per non-residential building

23040000 88500

22000000 3000000Water - Chilled Water Buildings Pipework 0 23050000

Water - Primary Chilled Water Pumps

Water - Secondary Chilled Water Pumps

Water - Condensor Water Pumps

Water - Chilled Water Mains Pipework 12656000

SAR / Unit 10780 0 10780 0 0

SAR 89948320 0 89948320 0 0

SAR / Unit 90000 0 0 90000 140000

SAR 5580000 0 0 5580000 3360000

SAR / Unit 0 15370 0 15370 15370

SAR 0 160309100 0 160309100 160309100

SAR / Unit 0 57000 57000 0 57000

SAR 0 7125000 7125000 0 2907000

3700000 0

Allows for storage of 24 hours cooling tower make-up water

Water - Chilled Water Mains Pipework allows 38% for installation of burried chilled water mains pipework for OPTIONS 1, 3 and 4

300000 0

0 0 0 0

SAR

SAR

SAR

2460000 0 2220000

15750000 0 15750000Builders Work - Chilled Water Plantroom

inside non residential buildings including meters / OPTION 5: local chilled water pipework to each school from air cooled chillers serving 4 schools x SAR750,000/school including meters

To be confirmed by Quantity Surveyor

Allows for supply and installation of outdoor VRV units of capacity 2.0 TR with 3 indoor VRV units

0

Air - Fan Coil Units

Air - Air Handling Units

Air - Variable Refrigeration Volume Units / Split Air Conditioning Units

Builders Work - Chilled Water Mains Pipework

Air - Packaged Units

Builders Work - Cooling Tower Make-up Water Storage Tank

SAR 275978320 167434100 246593320 214585100 174384600

SAR 96592412 117203870 95197722 142473455 122069220

Allows for supply and installation of gen-sets, transformers, ACB, ATS and cabling at 35% of mechanical system total for water cooled chilled water systems and AHUs and FCUs (requires smaller capacity electrical infrastructure at chillers and on site and smaller run-out cables to site as AHUs and FCUs only require electrical power to fans and controls), and 70% for air cooled chilled water systems and packaged and VRV units (requires larger capacity electrical infrastructure at chillers and on site and larger run-out cables to site as packaged and VRV units require electrical power to compressors, fans and controls), % benchmarked from previous projects

To be confirmed by Quantity Surveyor

SAR 0 0 0 0 0 Excluded from CAPEX

SAR 372,570,732 284,637,970 341,791,042 357,058,555 296,453,820 Based on NEA costing of OPTIONS and assumptions indicated above

100.0% 76.4% 91.7% 95.8% 79.6% OF OPTION 1 - (87,932,762) (30,779,690) (15,512,177) (76,116,912) LESS THAN OPTION 1

Electrical System Total

Diesel Fuel System

CAPEX TOTAL

Mechanical System Total

11,815,850

Parameters OPTION 1 OPTION 2 OPTION 3 OPTION 4 OPTION 5 Comments

Years 15 15 15 15 15

ASHRAE life cycle estimates for maintained water cooled chilled water systems could be approximately 25 years and for air cooled chilled water systems could be approximately 20 years, KSAs abrasive sand / dusty air environment is a key life cycle degregation and derating consideration, ASHRAE life cycle estimate is assumed to reduce by approximately 5 years, for CAPEX and OPEX comparison allow 15 years for water and air cooled chilled water systems, and also 15 years for chilled water equipment items (AHUs and FCUs) and DX equipment items (packaged and VRV units)

Quantity 10 0 9 2 4

Tons of Refrigeration - Total 23300 0 20900 2400 1400 Refer COOLING LOAD ESTIMATE, 1,600kW / - / 1 600kW / 800kW / 650kW

kW / Ton R 0.75 0.00 0.75 0.75 1.50Best HFC-134a centrifugal chiller at 0.55 kW / Ton R at full load and ARI conditions, partial load to be considered

SAR / kW.Hour 0.26 0.26 0.26 0.26 0.26 Refer DYNAMIC ENERGY AND WATER SOLUTIONS

Cooling and HVAC System Options

Water - Chillers

2. OPERATIONAL EXPENDITURE ESTIMATE - OPEX - 15 YEAR LIFE CYCLE

Life Cycle of Chilled Water System

SAR / Hour 4544 0 4076 468 546 All chillers operational

Quantity 10 0 9 2 0

kW 150 0 150 60 0

SAR / kW.Hour 0.26 0.26 0.26 0.26 0.26

SAR / Hour 390 0 351 31 0 All cooling towers operational

Quantity 10 0 9 2 4

kW 75 0 75 45 40

SAR / kW.Hour 0.26 0.26 0.26 0.26 0.26

SAR / Hour 195 0 175.5 23 42

Quantity 5 0 4 2 0

kW 200 0 200 55 0

SAR / kW.Hour 0.26 0.26 0.26 0.26 0.26

SAR / Hour 260 0 208 29 0

Quantity 10 0 9 2 0

kW 200 0 200 75 0

SAR / kW.Hour 0.26 0.26 0.26 0.26 0.26

SAR / Hour 520 0 468 39 0

Quantity (m3 / Day) 4100 0 3700 450 0Refer COOLING TOWER MAKE-UP WATER ESTIMATE for diversified cooling tower make-up water demand

Water - Secondary Chilled Water Pumps

Water - Primary Chilled Water Pumps

Water - Condenser Water Pumps

Water - Cooling Towers

Quantity (m3 / Hour) 171 0 154 19 0

SAR / m3 6.00 6.00 6.00 6.00 6.00 As per DYNAMIC ENERGY AND WATER SOLUTIONS

SAR / Hour 1025 0 925 113 0

Quantity 8344 0 8344 0 0

kW 0.5 0 0.5 0 0

SAR / kW.Hour 0.26 0.26 0.26 0.26 0.26

SAR / Hour 1085 0 1085 0 0

Quantity 62 0 0 62 24

kW 40 0 0 40 55

SAR / kW.Hour 0.26 0.26 0.00 0.26 0.26

SAR / Hour 645 0 0 645 343

Quantity 0 10430 0 10430 10430

kW 0 3 0 3 3

SAR / kW.Hour 0.26 0.26 0.26 0.26 0.26

SAR / Hour 0 8135 0 8135 8135

Quantity 0 125 125 0 51

kW 0 20 20 0 20

SAR / kW.Hour 0.26 0.26 0.26 0.26 0.26

SAR / Hour 0 650 650 0 265

Air - Fan Coil Units

Air - Air Handling Units

Air - Variable Refrigeration Volume Units / Split Air Conditioning Units

Air - Packaged Units

Water - Undiversified Cooling Tower Make-up Water Demand - PEAK

SAR / Hour 0 650 650 0 265

SAR / Annum = SAR / Hour * 8760 Hours / Annum 75888055 76960104 69534427 83070204 81743064

% 75% 75% 75% 75% 75%

SAR / Annum 56916041 57720078 52150820 62302653 61307298

6.5% 6.5% 6.5% 6.5% 6.5% % of CAPEX total

24217098 18501468 22216418 23208806 19269498

SAR / Annum 81133139 76221546 74367238 85511459 80576796

% 5% 5% 5% 5% 5% Assumed OPEX Escalation / Annum

SAR 1,750,736,599 1,644,751,478 1,604,738,176 1,845,214,457 1,738,731,523 Allows for 15 year life cycle, and based on assumptions indicated above and typical power requirements

94.9% 89.1% 87.0% 100.0% 94.2% OF OPTION 4 (94,477,858) (200,462,979) (240,476,281) - (106,482,934) LESS THAN OPTION 4

Maintenance and Consumables

Diversified OPEX Total

SAR / Annum

OPEX Total / Annum - YEAR 1

Undiversified OPEX Total

Operational Diversity

OPEX TOTAL

OPEX Escalation / Annum


SAR 372,570,732 284,637,970 341,791,042 357,058,555 296,453,820 -

SAR 1,750,736,599 1,644,751,478 1,604,738,176 1,845,214,457 1,738,731,523 -

SAR 2,123,307,331 1,929,389,448 1,946,529,218 2,202,273,012 2,035,185,343 Allows for 15 year life cycle, and based on assumptions indicated above and typical power requirements

10.1% 100.0% 0.9% 14.1% 5.5% OF OPTION 2

193,917,882 - 17,139,770 272,883,563 105,795,894 MORE THAN OPTION 2


- HIGHEST CAPEXHIGH OPEX

LOWEST CAPEXLOWEST OPEX

MEDIUM CAPEXLOW OPEX

HIGH CAPEXHIGHEST OPEX

LOW CAPEXMEDIUM OPEX

Allows for 15 year life cycle, and based on assumptions indicated above and typical power requirements

PAY-BACK

OWNING TOTAL

Chilled Water System Options

Cooling and HVAC System Options

OPEX TOTAL

CAPEX TOTAL

3. OWNING EXPENDITURE ESTIMATE - 15 YEAR LIFE CYCLE

4. SIMPLE PAY-BACK PERIOD ESTIMATE - 15 YEAR LIFE CYCLE

q

Option Serves Equipment Description / Unit TR / THR Totals Quantity Units Unit Cost Installed Cost Total Unit Cost(AED)

Total Installed Cost (AED) Comments

Chillers (4.5 - 13.5) 2500 Tons 23300 10 3,900,000.00 4,500,000.00 39,000,000.00 45,000,000.00

Cooling Towers (5 Delta T) 3125 THR 29125 10 2,200,000.00 2,530,000.00 22,000,000.00 25,300,000.00

Water Storage Tank Size of 4100 m^3 - 1 2,460,000.00 - 2,460,000.00 No equipment to be purchased

Chilled Water Pumps - Primary 220 LPS - 11 570,000.00 660,000.00 6,270,000.00 7,260,000.00

Chilled Water Pumps - Secondary 440 LPS - 5 1,090,000.00 1,250,000.00 5,450,000.00 6,250,000.00

Cooling Tower Pumps 490 LPS - 11 1,090,000.00 1,250,000.00 11,990,000.00 13,750,000.00

Chiller Plantroom 75m x 70m in area - 1 15,750,000.00 - 15,750,000.00 No equipment to be purchased

Chilled Water Ring Main Pipes at 1000mm in diameter and 3600m long - 3600 4,650.00 6,400.00 16,740,000.00 23,040,000.00

FCUs 2.5 TR per unit - 8344 8,460.00 10,780.00 70,590,240.00 89,948,320.00

AHUs 5000 LPS per unit - 62 76,150.00 90,000.00 4,721,300.00 5,580,000.00

VRV 2.0 TR per unit 23300 10430 12,350.00 15,370.00 128,810,500.00 160,309,100.00 Use VRV

Split Air Conditioning Units 2.0 TR per unit - 10430 12,350.00 15,370.00 128,810,500.00 160,309,100.00 VRV or split air conditioning units

Packaged Units 2500 LPS per unit - 125 48,300.00 57,000.00 6,037,500.00 7,125,000.00

Chillers (4.5 - 13.5) 2500 Tons per unit 20900 9 3,900,000.00 4,500,000.00 35,100,000.00 40,500,000.00

Cooling Towers 3125 THR per unit 26125 9 2,200,000.00 2,530,000.00 19,800,000.00 22,770,000.00

Water Storage Tank Size of 3700 m^3 - 1 2,220,000.00 - 2,220,000.00 No equipment to be purchased

Chilled Water Pumps - Primary 220 LPS - 10 570,000.00 660,000.00 5,700,000.00 6,600,000.00

Chilled Water Pumps - Secondary 440 LPS - 5 1,090,000.00 1,250,000.00 5,450,000.00 6,250,000.00

Cooling Tower Pumps 490 LPS - 10 1,090,000.00 1,250,000.00 10,900,000.00 12,500,000.00


Chilled Water Ring Main Pipes at 1000mm in diameter and 3600m long - 3600 4,650.00 6,400.00 16,740,000.00 23,040,000.00

FCUs 2.5 TR per unit - 8344 8,460.00 10,780.00 70,590,240.00 89,948,320.00

DX to Non-Residential Components of Phase 1 and Packaged Units 2500 LPS per unit - 125 48,300.00 57,000.00 6,037,500.00 7,125,000.00

VRV 2.0 TR per unit - 10430 12,350.00 15,370.00 128,810,500.00 160,309,100.00 Use VRV


Chillers (4.5 - 13.5) 1250 Tons per unit 2400 2 2,000,000.00 2,300,000.00 4,000,000.00 4,600,000.00

Cooling Towers 1550 THR per unit 3000 2 1,130,000.00 1,300,000.00 2,260,000.00 2,600,000.00

Water Storage Tank Size of 450 m^3 - 1 300 000 00 - 300 000 00 No equipment to be

SABICSABIC RIYADH COMPOUND PROJECT

OPTIONS 1 to 5

9/5/2012

REVISION A

NEA COST ESTIMATES OF OPTIONS

1Chilled Water to Residential and Non-Residential Components of Phase 1 and Phase 2

2DX to Residential and Non-Residential Components of Phase 1 and Phase 2

3

Chilled Water to Residential Components of Phase 1 and Phase 2

DX to Residential Components of Phase 1 and Phase 2

Water Storage Tank Size of 450 m 3 - 1 300,000.00 - 300,000.00 purchased

Chilled Water Pumps - Primary 115 LPS - 3 300,000.00 350,000.00 900,000.00 1,050,000.00

Chilled Water Pumps - Secondary 115 LPS - 3 300,000.00 350,000.00 900,000.00 1,050,000.00

Cooling Tower Pumps 250 LPS - 3 630,000.00 720,000.00 1,890,000.00 2,160,000.00


Chilled Water Ring Main Pipes at 350mm in diameter and 2800 long - 2800 3,300.00 4,520.00 9,240,000.00 12,656,000.00

AHUs 5000 LPS per unit - 62 76,150.00 90,000.00 4,721,300.00 5,580,000.00

VRV 2.0 TR per unit - 10430 12,350.00 15,370.00 128,810,500.00 160,309,100.00 Use VRV


Packaged Units 2500 LPS per unit - 51 48,300.00 57,000.00 2,463,300.00 2,907,000.00

Air Cooled Chillers (6 - 12) 500 Tons per unit 2000 4 830,000.00 950,000.00 3,320,000.00 3,800,000.00

Chilled Water Pumps 75 LPS - 8 195,000.00 230,000.00 1,560,000.00 1,840,000.00

Chilled Water Riser / Dropper Pipes at 250mm in diameter and height of school long - 30 2,160.00 2,950.00 64,800.00 88,500.00

AHUs 7500 LPS per unit - 24 118,000.00 140,000.00 2,832,000.00 3,360,000.00

4Chilled Water to Non-Residential Components of Phase 1 and Phase 2

5

DX to Residential and Non-Residential Components of Phase 1 and Phase 2

Chilled Water to Schools


Appendix D Cooling Load and Cooling Tower Make-Up Water Estimates

Cooling Load Estimates – PRELIMINARY

Cooling Tower Make-Up Water Estimates – PRELIMINARY

9/5/2012

Unit GFA Total GFA Supply Air Cooling Load Rate Cooling Load Estimates

(m2) (m2) (7.5LPS/m2) (m2/TR) (TR)

Unit Type A 413 158 65254 - 20.0 3263

Unit Type B 384 33 12672 - 20.0 634

Unit Type C 454 37 16798 - 20.0 840

Unit Type D 439 101 44339 - 20.0 2217

Unit Type E 470 93 43710 - 20.0 2186

Boys School 4,225 1 4225 31690 18.0 235

Girls School 6,550 1 6550 49125 18.0 364

Town Center 1,800 1 1800 13500 18.0 100

Men Recreation Center 1,600 1 1600 12000 18.0 89

Women Recreation Center 1,400 1 1400 10500 18.0 78

Juma Mosque 2,400 1 2400 18000 15.0 160

Local Mosques 1,300 1 1300 9750 15.0 87

Town Center Mosques 900 1 900 6750 15.0 60

Labor Accommodation 1,350 1 1350 - 20.0 68

Security Gate House 150 1 150 - 20.0 8

Total - 432 204448 151315 19.7 10386


(m2) (m2) (7.5LPS/m2) (m2/TR) (TR)

Unit Type A 277 12 3326 - 20.0 166

Unit Type B 242 56 13552 - 20.0 678

Unit Type C - - - - - -

SABIC

PHASE 1 (SAUDI)

REVISION A


COOLING LOAD ESTIMATES - PRELIMINARY

CommentsBuilding Type # Units

PHASE 1 (EXPAT)

Comments# UnitsBuilding Type

yp

Unit Type D (All Units) 4,528 1 4528 - 20.0 226

Unit Type E (All Units) 3,214 1 3214 - 20.0 161

Unit Type F-1 232 36 8352 - 20.0 418

Unit Type F-2 201 40 8040 - 20.0 402

Kindergarten (Boys and Girls) 465 1 465 3490 18.0 26

Club House / Recreation Center 1,400 1 1400 10500 18.0 78


Total - 149 42952 13990 19.9 2158


(m2) (m2) (7.5LPS/m2) (m2/TR) (TR)

Unit Type A 413 171 70623 - 20.0 3531

Unit Type B 384 51 19584 - 20.0 979

Unit Type C 454 64 29056 - 20.0 1453

Unit Type D 439 88 38632 - 20.0 1932

Unit Type E 470 72 33840 - 20.0 1692

Boys School 5,688 1 5688 42655 18.0 316

Girls School 8,013 1 8013 60095 18.0 445

Town Center 800 1 800 6000 18.0 44

Men Recreation Center 1,500 1 1500 11250 18.0 83

Women Recreation Center 1,300 1 1300 9750 18.0 72

Local Mosques 2,250 1 2250 16875 15.0 150


Total - 453 211385 146625 19.8 10703

PHASE 2

Building Type Comments# Units

Total GFA Cooling Load Rate Cooling Load Estimates

Cooling Load Estimate

RESIDENTIAL


NON-RESIDENTIAL


NON-RESIDENTIAL -SCHOOLS

(m2) (m2/TR) (TR) (TR) (TR) (TR)

PHASE 1 (SAUDI) 204448 19.7 10386 9214 573 599

PHASE 1 (EXPAT) 42952 19.9 2158 2054 104 0

PHASE 1 - Total 247400 19.7 12544 11268 677 599

PHASE 2 - Total 211385 19.8 10703 9592 350 761

Total 458785 19.7 23246 20860 1027 1360

Comments

TOTALS

Phase

REVISION A

1. COOLING TOWER SELECTION INPUTS

Chillers

SABIC


9/5/2012

COOLING TOWER MAKE-UP WATER ESTIMATE - PRELIMINARY

OPTION 1 - RESIDENTIAL AND NON-RESIDENTIAL - WATER COOLED CHILLERS (CENTRALIZED)

Selection Trane PRELIMINARY

Quanity 10

Capacity (Tons R / Chiller) 2500 INCLUDING 2 X 1,250 TR CHILLERS

Total Capacity (Tons R) 25000 87921

Cooling Towers

Selection BAC PRELIMINARY

Quantity 10

Cells / Tower 2

Capacity (Tons R / Tower) 1250 4396

Capacity (Tons HR / Tower) 3125 10990 25%

Condenser Water Flow (US gpm / Tower) 6913 436

Total Condenser Water Flow (US gpm) 69126 4361

T Water In (F) 105.8 41.0 BAC

T Water Out (F) 95.0 35.0 BAC

T Wet Bulb (F) 86.0 30.0 BAC

1 l/s 15.85 US gpm

1l 0 264 US g1l 0.264 US g

Operational Day (Hours) 24 1440

Emergency Chilled Water Provisions (Days) 1 PRELIMINARY

2. OPERATIONAL DIVERSITY

Operational Diversity 75% PRELIMINARY CONSERVATIVE

3. EVAPORATION, BLEED AND DRIFT Induced Draft: 0.1% - 0.3% of Total Condenser Water Flow

With Drift Eliminators: 0.01% of Total Condenser Water Flow

T in (F) T out (F) V Poor Poor Medium Good V Good Selection

Total Evaporation 69126 4361 105.8 95 0.001 746.6 47.1 - - - - - - - - - - - - As per BAC

Total Bleed - - - - - - 3.0 4.0 5.0 6.0 7.0 4.0 249 15.7 - - - - - -

Total Drift 69126 - - - - - - - - - - - - - 0.01% 6.9 0.4 - - -

Undiversified - PEAK - - - - - - - - - - - - - - - - - - 1002 63.2 -

Bleed (US gpm)

Number of Cycles Based On Water QualityEvaporation (US gpm)

Flow (US gpm)

Undiversified Cooling Tower Water Losses (All Cooling Towers)

Range Evaporation (l/s)

Cp / Hv Factor = 1 / 1000Flow (l/s) Drift

(l/s)Bleed (l/s)

Drift (US gpm) CommentsDrift % Total

(l/s)Total

(US gpm)

Diversified - AVERAGE - 752 47.4

4. DIVERSIFIED COOLING TOWER MAKE-UP WATER DEMAND 5. COOLING TOWER MAKE-UP WATER STORAGE TANK DIMENSIONS - BASED ON DIVERSIFIED COOLING TOWER MAKE-UP WATER DEMAND

Cooling Tower Water Losses (All Cooling Towers)

Total (Imp gpm)

Total (US gpm)

Total (l/s)

Total (Imp gal)

Total (US gal)

Total (m3) Comments Item L (m) W (m) H (m)

Diversified - 1 DAY - - - 901384 1082517 4098 - Dimensions 30.0 30.4 4.5

Comments

Tank height = H + 1m minimum air gap to slab required

REVISION A


Chillers

SABIC


9/5/2012

OPTION 3 - RESIDENTIAL - WATER COOLED CHILLERS (CENTRALIZED)



Quanity 9

Capacity (Tons R / Chiller) 2500


Cooling Towers


Quantity 9

Cells / Tower 2








1 l/s 15.85 US gpm

1l 0 264 US g1l 0.264 US g









Total Bleed - - - - - - 3.0 4.0 5.0 6.0 7.0 4.0 224 14.1 - - - - - -

Total Drift 62214 - - - - - - - - - - - - - 0.01% 6.2 0.4 - - -


Drift (l/s)

Total (US gpm)

Total (l/s) CommentsEvaporation

(l/s)

Number of Cycles Based On Water Quality Bleed (US gpm)

Bleed (l/s) Drift % Drift

(US gpm)Undiversified Cooling Tower Water Losses

(All Cooling Towers)Flow

(US gpm) Flow (l/s)Range Cp / Hv Factor

= 1 / 1000Evaporation

(US gpm)




Total (Imp gpm)

Total (US gpm)

Total (l/s)

Total (Imp gal)

Total (US gal)



Comments


REVISION A


Chillers

SABIC


9/5/2012

OPTION 4 - NON-RESIDENTIAL - WATER COOLED CHILLERS (CENTRALIZED)



Quanity 2

Capacity (Tons R / Chiller) 1250


Cooling Towers


Quantity 2

Cells / Tower 2








1 l/s 15.85 US gpm

1l 0 264 US g1l 0.264 US g









Total Bleed - - - - - - 3.0 4.0 5.0 6.0 7.0 4.0 25 1.6 - - - - - -

Total Drift 6913 - - - - - - - - - - - - - 0.01% 0.7 0.0 - - -


Drift (l/s)

Total (US gpm)

Total (l/s) CommentsEvaporation

(l/s)

Number of Cycles Based On Water Quality Bleed (US gpm)

Bleed (l/s) Drift % Drift

(US gpm)Undiversified Cooling Tower Water Losses

(All Cooling Towers)Flow

(US gpm) Flow (l/s)Range Cp / Hv Factor

= 1 / 1000Evaporation

(US gpm)




Total (Imp gpm)

Total (US gpm)

Total (l/s)

Total (Imp gal)

Total (US gal)



Comments


Date post:	27-Oct-2014
Category:	Documents
Upload:	mohammed-algendy
View:	27 times
Download:	1 times

Sr00 Std Swo Hva Rep 0001

Documents