HVAC Handbook HVAC Design Brief (Singapore)

Project: Commercial Complex @ Bangalore HVAC Design Brief

Architects 1 Entask Consultancy Services (P) Ltd.

COMMERCIAL COMPLEX @ SARJAPUR ROAD, BANGALORE

HVAC DESIGN BRIEF

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INDEX OF CONTENTS

SL.NO.

DESCRIPTION

PAGE NUMBER

5.0 HVAC

5.1 GENERAL

3

5.2

SCOPE OF HVAC WORKS 4 - 5

5.3

DESIGN CRITERIA AND DESCRIPTION 6

5.4

CODES AND STANDARDS 7 9

5.5

HVAC DESIGN CONDITIONS 10

5.6

PROJECTED HVAC REQUIREMENT 11

5.7

EQUIPMENT DETAILS 12 25

5.8

SCHEMATIC DIAGRAMS 26

5.9

ELECTRICAL LOAD LIST 27

5.10

HEAT LOAD CALCULATION LIST 28 - 29

5.1 GENERAL




THIS DOCUMENT BRIEFS ON THE HVAC SYSTEM ADOPTED FOR COMMERCIAL COMPLEX @ SARJAPUR

ROAD, BANGALORE.

COMMERCIAL COMPLEX is a Commercial Complex Development of built up area of approx. 7.67 lakh

Sq.ft. with three Office blocks, Parking, other common areas and utilities. It is proposed to design

the total infrastructure facility for the schedule of areas.

The schedule of areas is as follows.

SL. NO. DESCRIPTION

APPROX. AREA (Sq. ft) PURPOSE

1 LOWER BASEMENT 2 87,995.0 Car Parking & STP

2 LOWER BASEMENT 1 87,995.0 Car Parking

3 UPPER BASEMENT 87,995.0 Car Parking

4 GROUND FLOOR 1,10,407.0 Offices, Toilets, Electrical Rooms & Lobby

5 FIRST FLOOR 43,710.0 Offices, Toilets, Electrical Rooms & Lobby

6 SECOND FLOOR 43,710.0 Offices, Toilets, Electrical Rooms & Lobby

7 THIRD FLOOR 43,710.0 Offices, Toilets, Electrical Rooms & Lobby

8 FOURTH FLOOR 43,710.0 Offices, Toilets, Electrical Rooms & Lobby

9 FIFTH FLOOR 43,710.0 Offices, Toilets, Electrical Rooms & Lobby

10 SIXTH FLOOR 43,710.0 Offices, Toilets, Electrical Rooms & Lobby

11 SEVENTH FLOOR 43,710.0 Offices, Toilets, Electrical Rooms & Lobby

12 EIGHTH FLOOR 43,710.0 Offices, Toilets, Electrical Rooms & Lobby

13 ROOF 43,399.0 HVAC Plant area & Open Terrace

TOTAL AREA

7,67,471.0

NOTE: ABOVE TABULATION SUBJECT TO CHANGE BASED ON REVISION OF ARCHITECT DRAWINGS PROJECT DESIGN BRIEF

COMMERCIAL COMPLEX is a Commercial Complex Development of overall carpet area for air

conditioning works out to be 2.93 lakhs Sq. ft. excluding toilets and common areas like staircases

etc.

5.2 SCOPE OF HVAC DESIGN & WORKS




SCOPE OF HVAC DESIGN

Chilled water central plant design consisting of Hybrid combination of Chillers, Pumping system, Hydronic Pressure maintaining equipments, Chemical dosing system, Condenser ckt for Heat rejection by Cooling towers and to generate Chilled water which can deliver the desired Airside Temperature of 23+/- 1 DEG C. on the Low side.

Chilled water & Condenser water pumping design with use of Variable frequency drive for

Secondary chilled water pumps.

Chilled water, Condenser water & Condensate drain piping network with routing.

Space allocation of AHU and CSU Units for all the Floors showing Scheme Drawing of all usable spaces like OFFICE blocks and etc.

Common area Air Conditioning scheme.

Appropriate Fresh air distribution of to the Office AHUs to maintain Indoor Air quality.

BTU Metering and Tenant Billing system Design for enabling billing for End users based on

actual consumptions.

Forced Ventilation system design for Toilets - 16 ACPH and for Sewage Treatment Plant.

Ductless Ventilation system for Basement floors CAR parking @ 04 ACPH for Normal mode, 08 ACPH for Pollution mode and 30 ACPH for Fire Modes.

Air Pressurization system for escape routes in the Basement levels - Staircase and Lobby.

IBMS system integration of all HVAC Equipments and Control elements.

SCOPE OF HVAC WORKS The central Heating, Ventilation and Air-Conditioning (HVAC) system shall comprise of following:

a) HIGH SIDE EQUIPMENT

Design of the equipment based on the data furnished in the document.

Procurement of materials within the battery limits as per the schedule given by Owner /

Project Managers.

Manufacturing as per standards & details furnished in the specifications.

Assembly.

Testing in Shop before delivery.

Inspection.

Insurance up to handing over.

Packing & Forwarding.

Transportation.

Installation at Site as per the schedule given by Owner/ PROJECT MANAGERS.

Submission of method statements for execution.

Commissioning in the presence of specialized agency (manufacturers representative).




Performance Guarantee run.

Handing over.

b) LOW SIDE WORKS

Design of the equipment based on the data furnished in the document.

Procurement of materials within the battery limits as per the schedule given by Owner /

Project Managers.

Manufacturing as per specifications mentioned in the document.

Assembly at Site.

Commissioning.

Testing of all equipment as per the list attached in the document.

Performance Guarantee run.

Handing over.

Supply of various equipment as per the relevant Specification & Drawings, unloading, receiving, inspection, storing, transportation to work site, handling, assembling, cleaning, mechanical erection, assisting main contractor in associated civil works which are required for ac system, Installation, alignment, testing and commissioning and handing over in working condition of all items covered in the BOQ.

5.3 DESIGN CRITERIA & DESCRIPTION FRESH AIR




AS PER ASHRAE 62 N Ideal air conditioning equipment should sanities cool, heat, humidify/dehumidify, evenly distribution air through the area and all; cost effectively. The world focus has shifted from the environment to Invironment. This is a new terminology, being used increasingly to focus on the Indoor Air Quality (IAQ) and its effect on human health. While the outdoor environment continues to be of concern, the indoor environment is receiving increased attention as more information has become available on the presence and effect of indoor contaminants.

ASHRAE 62-1989 IAQ STANDARD: "VENTILATION FOR ACCEPTABLE INDOOR AIR QUALITY"

From the above chart it clearly states that 20 cfm / person is the desired rate of fresh air to

maintain good INDOOR AIR QUALITY (IAQ).

DESIGN ASSUMPTIONS OCCUPANCY - 80 sqft / person on built up area i.e. as per Architects area summary sheet FRESH AIR - 20 cfm / person LIGHTING LOAD - 1.5 watts /sqft EQUIPMENT LOAD - 225 watts / Computer set GLAZING - Double Glazing STP WATER REQUIRED FOR WATER COOLED CHILLERS - 30 KLD of Make-up water 5.4 CODES & STANDARDS




Basically Air-conditioning system design shall be done as per latest ASHRAE Standards. Also other applicable Standards which shall be considered as guidelines are mentioned as under:-

AMERICAN SOCIETY FOR HEATING, AIR CONDITIONING & REFRIGERATION ENGINEERS

(ASHRAE)

FRESH AIR AS PER ASHRAE STANDARDS

IS WHERE EVER APPLICABLE

SMACNA STANDARDS FOR SHEET METAL DUCTING

UL STANDARDS FOR FIRE DAMPERS

NBC STANDARDS WHERE EVER APPLICABLE

ECBC STANDARDS

The installation shall conform in all respects to ASHRPROJECT MANAGERS / Indian Standard Code of Practice for Air conditioning Installation, tender specifications and drawings. In case of discrepancy among specifications, drawings and other documents, the specifications take precedence over all other documents. In case of discrepancy between specification, drawings etc., & Codes & Standards, the tenderer shall assume the more stringent of the two. CODES & STANDARDS Air Conditioning Equipment IS 659 Safety Code for air conditioning IS 660 Safety Code for mechanical refrigeration IS 3615 Glossary of terms used in refrigeration & air conditioning IS 5111 Testing of refrigeration compressors IS 7896 Data for outside design conditions for air conditioning IS 10617 Hermetic Compressors (Part-I, II & III) IS 11338 Thermostats for use in refrigeration, air conditioners etc. SP 7 National Building Code (Group 4) IS 3615 Glossary of terms used in refrigeration and air conditioning IS 7896 Outside design data condition for AC design is for summer months Noise & Vibration IS 2264 Preferred frequencies for acoustical measurements. IS 3483 Code of practice for noise reduction IS 3932 Sound level meter for general purpose use. IS 9736 Glossary of terms applicable to acoustics in buildings. IS 9901 Measurement of sound insulation in buildings & building elements IS 9876 Guide to the measurement of air borne acoustical noise & evaluation of its effects on man. IS 10423 Personal sound exposure meter. IS 11446 Measurement of air borne noise emitted by compressors units intended for outdoor use. IS 12710 Glossary of terms used in acoustic emission testing. IS 4758 Methods of measurement of noise emitted by machines IS 14280 Mechanical vibration balancing shaft and fitment key convention IS 12065 Permissible limits of noise level for rotating electrical machines.




Pipe & Fittings IS 638 Gaskets IS 1239 Mild steel tubes & fittings IS 5822 Code of practice laying of electrically welded steel pipes for water supply. Pump & Valves IS 778 Copper alloy gate, globe & check valves for water works purposes. IS 4854 Glossary of terms for valves and their parts. IS 5312 Swing check type non return valves. IS 8092 Code for inspection of surface quality of steel castings for valves, fittings & other piping components. IS 12969 Method of test for quality characteristic of valves. IS 13095 Butterfly valves for general purposes. Refrigerant Gas & Lubricants IS 1447 Method of sampling and test for lubricants. IS 4578 Lubricating oils for refrigeration machinery IS 10609 Refrigerants Number Designation Sheet Metal Works IS 277 Galvanized Steel sheet IS 513 Cold rolled low carbon steel sheets. Thermal Insulation IS 334 Glossary of terms relating to bitumen & tar IS 3069 Glossary of terms, symbols & units relating to thermal insulation materials IS 3144 Mineral wool thermal insulation Methods of tests IS 3346 Method of determination of thermal conductivity of thermal insulation materials IS 4671 Expanded polystyrene for thermal insulation purposes International Standards SMACNA HVAC Systems Duct Design SMACNA HVAC Air duct leakage test manual SMACNA HVAC duct construction standards Metal & flexible SMACNA Rectangular duct construction SMACNA Round duct construction SMACNA Energy conservation guidelines. SMACNA Energy recovery equipment and systems, air to air ANSI-UL-555-1985 Fire dampers ANSI Scheme for identification of piping system SMACNA HVAC Systems Testing, adjusting & balancing CTI Acceptance test code for water cooling towers, mechanical draft, natural draft, fan assistant type evaluation of results and thermal testing of wet and dry cooling towers as per CTI-ATC-105- 1990 CTI Code of measurement of sound from cooling towers as per CTI- ATC-128 ANSI / AMCA Laboratory methods for testing fans for rating as per ANSI / AMCA 210 UL Fire dampers as per ANSI-UL-555




ASME Scheme for identification of piping system as per ANSI / ASME A- 13.1 Drawings, Specifications and deviations The drawings and specifications lay down minimum standards of equipment and workmanship. Should the tenderer wish to depart from the provisions of the specifications and drawings either on account of manufacturing practice or for any other reasons, he should clearly draw attention in his tender to the proposed points of departures and submit such complete information, Drawings and specifications will enable the merits of the deviations to be fully appreciated. In the absence of any such deviation list, it will be deemed that the tenderer is fully satisfied with the intents of the specifications and the drawings and their compliance with the statutory provisions and local codes. All deviations or departures not brought out to the notice shall be disregarded. Units of Measurement HVAC design documents will generally use inch-Pound (IP) Units. In those instances where both SI and IP units are listed, the IP units take precedence of cooling and heating load calculations and equipment specification. The following listing indicates common application of Units of Measurement for HVAC Design Documents.

DUCTWORK SIZE : Millimetres OR Inches

PIPE SIZE : Millimetres OR Inches

AREA : Square feet OR Square meters

VELOCITY : Feet per minute OR Meter per Second

TEMPERATURE : Degrees F OR Degrees C

FAN/DUCT PRESSURE : Pascals (Pa) OR Inches of W.C. PUMP PRESSURE : Meters OR Feet of Liquid - Water

AIR FLOW RATE : Cubic Feet/Minute - CFM OR Litres/Second - LPS

LIQUID FLOW RATE : Gallons/Minute - GPM OR Litres/Second - LPS

5.5 HVAC DESIGN CONDITIONS




INSIDE & OUTSIDE CONDITIONS: LOCATION: SITE LOCATION - BANGALORE GEOGRAPHICAL LOCATION - 12.58 DEG N ALTITUDE - 921 M ABOVE MEAN SEA LEVEL

The outside and inside conditions for the desired facility shall be designed based on below

mentioned parameters:

INSIDE CONDITIONS: OFFICE BLOCKS 1) Dry Bulb Temperature - 23 +/- 1 DEG C.

2) Relative Humidity - Less than 60%

The air conditioning system for the Commercial Complex facility shall be designed to cater for the

Comfort cooling application only.

OUTDOOR DESIGN CONDITION:

SUMMER

DRY bulb temp 35.6 DEG C WET bulb temp 25.6 DEG C RH-45 %

MONSOON

DRY bulb temp 27.8 DEG C

WET bulb temp 25.6 DEG C RH -82 %

WINTER DRY bulb temp 14.4 DEG C WET bulb temp 12.2 DEG C RH -78 %

5.6 PROJECTED HVAC REQUIREMENT IN TR




Sl.No.Floor

ReferenceDescription of

Application Carpet Area

AC (sq ft) Occupancy

TR as per Heatload

CFM Fresh Air

Block-A - Office 10,092.9 126 52.86 24,997 2,523 Block-B - Office 9,716.3 121 49.80 23,394 2,429 Block-C - Office 16,043.2 201 81.13 37,952 4,011








9 Eighth Floor Block-A - Office 5,433.8 68 25.01 11,332 1,358

293,780.6 3,672.26 1,491.52 698,561 73,445 Grand Total

Sixth Floor7

Seventh Floor8

Third Floor

5 Fourth Floor

Fifth Floor6

SUMMARY OF AC TONNAGE LOADS PURVANKARA COMMERCIAL COMPLEX PROJECT, SARJAPUR ROAD, BANGALORE

Ground Floor

First Floor

Second Floor

1

2

3

4

The overall AC load estimate works out to be about 1492.0 TR and by applying the diversity, it is proposed to install 1300.0TR of air conditioning plant. A centralized air conditioning system is proposed with a hybrid combination of AIR COOLED SCREW CHILLERS of 300TR x 3nos. + 200TR x 2nos. WATER COOLED SCREW CHILLERS with Chilled & Condenser water Pumping system, Hydronic Pressure maintaining equipments, Chemical dosing system and Condenser ckt for Heat rejection by Cooling towers.

5.7 EQUIPMENT DETAILS




HVAC SYSTEM PROPOSED

Based on the data furnished in the Design Basis, the air conditioning area for the Building works out about 2,93,780Sq.ft. excluding toilets and common areas like staircases etc. As such, the capacity of the air conditioning plant required works out to around 1492.0TR. Applying the diversity factor of 0.87, it is proposed to install 1300.0TR of air conditioning plant. A centralized air conditioning system is planned with a hybrid combination of AIR COOLED SCREW CHILLERS of 300TR x 3nos. + 200TR x 2nos. WATER COOLED SCREW CHILLERS with Chilled & Condenser water Pumping system, Hydronic Pressure maintaining equipments, Chemical dosing system and Condenser ckt for Heat rejection by Cooling towers. v The chilled water plant consisting of Water cooled chillers system shall utilize treated water

generated from the STP for make up water requirement. v The pumping system shall comprise of Primary, Secondary and Condenser water pumps.

v Secondary pumping system shall be with Variable speed pumps with VFD application to

save energy during diversified load. v The chilled water generated shall be metered by means of BTU METERS.

v The overall make up water required for Water cooled plant of 400TR capacities is around

30 KLD which is fed from the treated STP water. v The chiller plant shall be placed in the Terrace of the building. The Water cooled chillers

and pumping system shall be housed inside a closed roof. v The reason for a combination of chillers is as per the loading pattern and difference in DB

(Dry bulb) and WB (WET bulb) is very marginal, Hence chillers without VFD are envisaged. SYSTEM DESCRIPTION The overall load is generated by Centralized chilled water plant which is housed in the Terrace of the building. The chilled water generated shall be distributed to each floor by means of variable speed pumping system. The centralized chilled water generation plant consists of the following equipments: CHILLERS On-going performance verification of chiller capacity and power input is by means of certified computerized selection output to assure the owner of specified performance in accordance with the latest version of ARI Standard 550/590 and EUROVENT STANDARDS. All chillers that fall within the scope of the certification program have an ARI certification label at no cost to the owner. Equipment covered by the ARI certification program include all water-cooled centrifugal and screw water chilling packages rated up to 2000 tons (7,000kW) for 60 hertz service at ARI standard rating conditions, hermetic or open drive, with electric driven motor not exceeding 5000 volts, and Cooling water (not glycol). For 50 hertz application the capacity range covered is 200 to 1,000 tons (700 to 3500 kW). Published certified ratings verified through testing by ARI include: v Capacity, tons (kW) v Power, kW/ton (COP) v Pressure drops, ft. of water (kPa)




v Integrated Part Load Value (IPLV) or Non-Standard Part Load Value (NPLV) As part of the ARI certification program, ARI has computer selection program used to select and rate chillers. The certified computer program version number and issue date for all manufacturers is listed in the ARI Directory of Certified Applied Air-Conditioning Products available on www.ari.org. ARI Standard 550/590-98 for Centrifugal or Screw Water - Chilling Packages and associated manuals define certification and testing procedures and tolerances of all units that fall within the application rating conditions. DESIGN PARAMETERS FOR CHILLER SELECTION The standard rating conditions are: Leaving chilled water temperature ...........................44F Evaporator waterside field fouling allowance ............0.0001 Chilled water flow rate ............................................2.4 gpm/ton Entering condenser water temperature .....................85F Condenser waterside field fouling allowance.............0.00025 (for Water cooled chillers) Condenser water flow rate .....................................3.0 gpm/ton (for Water cooled chillers)

Air cooled screw chiller Air cooled screw chillers, which are largely used in the comfort cooling industry, the chiller package shall consist of compressor-motor units, condenser coils, condenser fans, chiller, receiver, refrigerant piping & fittings, refrigerant feeding devices, valves, strainer, liquid moisture indicator, suction line insulation, first charge of oil & gas, starter panel & Micro-processor panel etc., all the components being mounted on welded steel base frame; the base frame, structural profiles & panels made of galvanized sheet steel (GSS) shall be protected with primary coating & finished with acrylic paint. The Chillers shall be suitable for outdoor installation; in other words, no weather protection of any kind by way of wall or roof is contemplated. The starter panel shall be suitable for outdoor application & shall confirm IP - 55 grade of protection. The panel shall incorporate main disconnect switches & fuses for individual motors, contactors, over load relays, single phase preventers, under/ over voltage trip, on/off push buttons, auto manual switches to facilitate automatic operation through DDC System or for manual operation to facility for remote starting & stopping of chiller packages, auxiliary contactors, etc. if any required.




Water cooled screw chiller

Water cooled screw chillers, which are also largely used in the comfort cooling industry, the unit shall be completely factory assembled and wired in a single package complete with screw compressor(s), cooler, condenser, starting control, safety and operating controls, refrigerant piping & fittings, refrigerant feeding devices, valves, strainer, liquid moisture indicator, suction line insulation, first charge of oil & gas, starter panel & Micro-processor panel etc,. The unit shall be constructed from heavy gauge galvanized steel and steel "C" channel with built-in skid and lifting holes. Evaporator Evaporator shall be direct expansion, shell and tube type. The shell is fabricated from seamless carbon steel pipe, with finned copper tubes and tube sheets of heavy gauge carbon steel. The c o o l e r s h a l l b e i n s u l a t e d w i t h c l o s e d c e l l f o a m e d r u b b e r i n s u l a t i o n . Condensers Condensers shall be shell and tube type and the condensers shall have removable heads on both ends for tube cleaning and servicing. The condensers shall be leak tested at working pressure and include relief valves and purge valves. Compressor The overall compressor design shall include a suction cooled motor, integral lubrication system utilizing compressor pressure differential and semi-hermetic design. The casing is to be constructed from a high strength iron casting. An electric crankcase oil heater shall be provided to maintain the proper oil temperature when the system is not in operation. COOLING TOWER SYSTEM INDUCED DRAFT CROSS FLOW TYPE COOLING TOWERS WITH LOW NOISE AND CTI APPROVED




DESIGN CRITERIA Cooling tower thermal performance shall be certified by the Cooling Tower Institute in accordance with CTI Certification Standards STD-201 label at no cost to the owner. The cooling towers shall be of Cross flow, Induced-draft vertical discharge type, in rectangular single or multi-cell configuration complete with Motor, Fan, Hand rails, Ladder and other accessories etc. and designed with high efficiency drift eliminators to meet current environmental standards and guidelines for microbial control. It should be possible to hook up to BMS. The distribution system shall be gravity-feed type fitted with removable target nozzle to ensure equal water distribution over the fills. Drift eliminators shall be efficient enough to effectively limit drift loss to no more than 0.005% of the designed flow rate.

Storage capacity that needs to be planned for make up water should be at least one day consumption. PUMPING SYSTEM

Pump

The chilled water generated by the chiller plant shall be pumped to the respective floor AHUs units and load cells by means of secondary pumping system. The Chilled Water Pump Sets shall be back-pull out design fitted with variable frequency drive (VFD) for Secondary system. The pump shall be complete with ribbed cast iron casing, double shrouded single entry radial flow bronze impeller, mechanical seal, bearing bracket incorporating 2 nos. roller bearings, shaft, longer coupling, coupling guard, flanged connections for discharge and suction, purge /air vent/test cocks, etc Regulatory requirements of Pumps

Conform to Health/Life Safety Code for Public Schools

Conform to International Mechanical Code

Conform to BOCA National Building Code

Conform to BOCA National Fire Protection Code

Conform to State of Illinois Plumbing Code

Conform to National Electric Code NFPA 70

Conform to Illinois Accessibility Code

Conform to applicable ANSI/HI standards

Products: Listed and classified by Underwriters Laboratories, Inc. as suitable for the

purpose specified and indicated.




DESIGN REQUIREMENTS The power ratings of the pump motor shall be larger of the following:

The maximum power required by the pump from zero discharge to zero head.

110% of the power required at the duty point.

Pumps of a particular category shall be identical and shall be suitable for parallel operation with equal load division. Components of identical pumps shall be interchangeable.

Pump Logic Controller (should be fully compatible to hook up to BMS / Chiller Plant Management System)

The technologic pump logic controller assembly shall be listed by and bear the label of Underwriters Laboratory, Inc. (UL)

The Equipment should be able to hook up to chiller plant management system (BMS) via

software integration either in ASHRAE Backnet / RTU Modbus Protocol. Necessary hardware / software for integration should be part of scope.

The controller shall be specifically designed for variable speed pumping applications.

The controller shall function to proven program that safeguards against damaging

hydraulic conditions including: Pump flow surges Hunting End of curve System over pressure

The pump logic controller shall be capable of receiving up to two discrete analog inputs from zone sensor / transmitter as indicated on the plans. It will then select he analogue signal that has deviated the greatest amount from its set point. This selected signal will used as the command feedback input for a hydraulic stabilization function to minimize hunting. Each input signal shall be capable of maintaining a different set point value. Controller shall be capable of controlling up to three pumps in parallel.

The pump logic controller shall be capable of accepting an additional analog input for a

flow sensor. This input shall serve as the criteria for the end of curve protection algorithm.

The pump logic controller shall be self-prompting. All messages shall be displayed in plain English. The operator interface shall have the following features:

a) Multi-fault memory and recall last 10 faults and related operational data.

b) Red fault light, yellow warning light and Green power on light.

c) Soft-touch membrane keypad switches.

The pump logic controller shall be of a high end type i.e., all the parameters available

on the logic control panel should be able to monitor / controlled from the remote location and should housed in a NEMA 1 Enclosure.




The display shall have four lines, with 20 characters on three lines and eight large characters on one line. Actual pump information shall be displayed indicating pump status. VARIABLE FREQUENCY DRIVE ENABLED SECONDARY PUMPS have been adopted for PROPOSED COMMERCIAL COMPLEX FOR RAMKY.

Secondary pumping would enable Substantial energy savings due to partial load profile during off peak hours. Adjustable Frequency Drive

The adjustable frequency drives shall be pulse width modulation (PWM) type,

microprocessor controlled design.

VFD Shall is Danfoss VLT 6000 Series / ABB ACH 550 Series only.

The AFD, including all factory-installed options, be tested to UL standard 508. The AFD

also meets C-UL and is CE marked and builds to ISO 9001 standards.

The AFD shall be housed in a NEMA 1 enclosure. AFF with plastic enclosure shall not be

acceptable.

The AFD shall employ an advanced sine wave approximation and voltage vector control to

allow operation at rated motor shaft output speed with no derating. This voltage vector

control shall minimize harmonics to the motor to increase motor efficiency and life.

Power factor shall be near unity regardless of speed or load.

The VFD shall have balanced DC link reactors to minimize power line harmonics. VFDs

without a DC link reactor shall provide a 3 % impedance line reactor.

Input and output power circuit switching can be done without interlocks or damage to the

VFD.




BASEMENT DUCTLESS VENTILATION SYSTEM

Car Park Ventilation System for Upper Basement, Lower Basement 1 and 2

Height (m)

Area (m2)

Volume (m3)

Upper Basement 3.9 6,783 26,454

Lower Basement 1 3.1 6,894 21,372

Lower Basement 2 2.9 7,283 21,120

Car park details

The car parking comprises of three Basement Floor cars parking with entrance & exit openings.

The fresh air coming from the ramps of the Lower Ground level to the Upper Basement is sufficient.

Incase of Lower Basement 1 and 2 the fresh air from the ramps are not sufficient and hence supply air fans are required for lower basements 1 and lower basement 2.

The Car Park system if designed for 04 for Normal mode, 08 ACPH for Pollution mode and 30 ACPH for Emergency mode.

Upper Basement (Air Changes per Hour - ACPH): Normal Mode : 4 (ACPH) X 26,454 / 1.7 = 62,250 CFM Pollution mode : 8 (ACPH) x 26,454 / 1.7 = 1,24,500 CFM Fire mode : 30 (ACPH) x 26,454 / 1.7 = 4,66,830 CFM Lower Basement 1 (Air Changes Per Hour - ACPH): Normal Mode : 4 (ACPH) X 21,372 / 1.7 = 50,285 CFM Pollution mode : 8 (ACPH) x 21,372 / 1.7 = 1,00,570 CFM Fire mode : 30 (ACPH) x 21,372 / 1.7 = 3,77,145 CFM Lower Basement 2 (Air Changes Per Hour - ACPH): Normal Mode : 4 (ACPH) X 21,120 / 1.7 = 49,700 CFM Pollution mode : 8 (ACPH) x 21,120 / 1.7 = 99,400 CFM Fire mode : 30 (ACPH) x 21,120 / 1.7 = 3,72,720 CFM Since the car park is envisaged to have a common extract shaft, we have considered the following. Extract Fan Selections for Upper Basement, Lower Basement 1 and 2: We have taken a DIVERSITY FACTOR that fire will happen in Single basement only. Hence, the system is designed for Emergency mode in the Largest Basements i.e. 30 ACPH (1st Basement) - 4,66,830 CFM which also ensures 8 ACPH during Normal mode in all 3 basements. No. of Extract shaft : 4 No. No. of Fans in each shaft : 3 Nos Total No. of Extract Fans : 4 x 3 = 12 Nos. Capacity of each Extract fan : 4,66,830 / 12 = 39,000 CFM @ 25 mm WC.




Each Extract Fan Shaft Size : 6 X 2 Metres. For Lower Basement 1: No. of Supply shaft : 2 Nos. No. of Supply Fans / Shaft : 2 Nos. Total No. of Supply Fans : 2 x 2 = 4 Nos Capacity of Supply fan : 20,000 CFM 25 mm WC. Supply Fan Shaft Cut Out Size : 3.25 X 2 Metres. For Lower Basement 2: No. of Supply shaft : 2 Nos. No. of Supply Fans / Shaft : 2 Nos. Total No. of Supply Fans : 2 x 2 = 4 Nos Capacity of Supply fan : 20,000 CFM 25 mm WC. Supply Fan Shaft Cut Out Size : 3.25 X 2 Metres. Jet Fan and Extract Fan System Description:

PPM Level ACPH Jet Fan Total No. of Extract Fans 12 Nos.

0-25 ppm 4 Off 4 Fans will operate

25 ppm 8 Low Speed 8 Fans will operate

Emergency Mode 30 High Speed All 12 Fans will operate

0-25 ppm: When the CO level in the car park is between 0-25 ppm the Jet Fan are in the Off mode, 4 Nos. of Extract fans will be running to achieve 4 ACPH in all 3 Basements. > 25 ppm: When the CO level in the car park is greater than 25 ppm the Jet Fans will be operated at Low speed and 8 Nos. of extract fans will be running to achieve 8 ACPH in all 3 Basements. Emergency mode: During the emergency mode the Jet Fans will be operated at full speed, 12 Nos. of extract fans will be running to achieve 30 ACPH in the Basement where smoke is to be removed quickly.




Extract Fan Selections for Parking Upper Basement, Lower Basement 1 and 2:

Note: The Extract Fans are designed for 300 Degree C for one hour BEFORE CFD ANALYSIS AFTER CFD ANALYSIS AND JETFAN POSITIONING Our Ref: TAP/CP/B/2007/ 098 Dt: 06 / 10 / 2007

Units Specifications

Qty. Nos 12

Duty Volume CFM 39,000

Static Pressure mmWC 25

Selected Model HT 125 JM / 40 /6 / 9 / 25

Blower Type Axial Fan

Fan Diameter mm 1250

No of Blades 9

Fan Casing Long

Absorbed Shaft Power KW 10.74

Shaft RPM RPM 960

Recommended High Temperature Motor Single Speed KW 15 KW / 6pole

Sound Level @ 3 Metres Dba 76




Supply Fan Selections Lower Basement 1:

Note: the Supply fans are designed for 50 Degree C

Units Specifications Qty. Nos 2



Selected Model 100JM / 40 / 6 / 9 / 32



No of Blades 9

Fan Casing Long


Shaft RPM RPM 960

Recommended Motor Single Speed KW 7.5 KW / 6 Pole


Sound Level after Silencer Dba 60




Supply Fan Selections Lower Basement 2:

Units Specifications Qty. Nos 2



Selected Model 100JM / 40 / 6 / 9 / 32



No of Blades 9

Fan Casing Long


Shaft RPM RPM 960

Recommended Motor Single Speed KW 7.5 KW / 6 Pole


Sound Level after Silencer Dba 60




SPECIFICATIONS FOR JET FANS

Technical Data / Technical specifications of the JET THRUST FAN UNIT offered

Qty required : Upper Basement+Lower Basement 1+Lower Basement 2 =23+23+24 = 70 Nos.

Jet fans are with silencers & mounting assembly

JETFAN

Sound level is measured at 1.5-meter distance in reference value in parking areas

Note: The jet fans are designed for 300 Degree C for one hour Overall system description: The vehicle entrance & exit ramps shall be utilized as the main source of fresh air into the car

park for First Basement. It is proposed the extract points are located as shown on the marked drawing enclosed to you in

separate mail. The location of these extract points have been chosen to ensure the best distribution of the inlet airflow as possible and suitability for a system comprising of Jet Fan units as per the geometry of the Car Parking Area.

No. Description Unit Technical details

1 Nozzle Dia Mm 350 mm

2 Air Flow M3/sec 0.9/1.8 m3/sec @ 4 / 2 Pole

3 Capacity of Fan Cfm 1905 / 3810 Cfm

4 Tip Velocity m/s 16

5 Phase Ph 3

6 Voltage V 420

7 Frequency Hz 50

8 Revolution RPM 1420 /2840RPM

9 Ampere A 0.63 / 2.38 @ 4 / 2 Pole

10 Sound Level dB (A) 53 / 65 @ 4 / 2 Pole

11 Weight Kg 80

12 Power Consumption KW 0.1 KW / 1.0 KW @ 4 / 2 Pole

13 Rated Motor Power Kw 0.14 KW / 1.1 KW @ 4 / 2 Pole

14 Depth of Unit Mm 455 mm

15 Thrust Nm 8/32




Extract grilles would be located at high level. In case of main power failure the Extract Fans shall be provided with alternate source of power. All of the fans will be controlled via PLC based control panel separately for each Basement. The

logic shall be arrived separately for pollution mode and emergency mode separately. An interlink will need to be provided to allow communication between panels and also the BMS.

For the Pollution mode it is proposed that the extract fans in all Basements Floor are operated

to provide 8 ACPH. It is suggested that a Carbon Monoxide (CO) detection system is provided to control the background ventilation rate depending on car park usage and detected levels of CO. Details of a suitable detection head for this application can be provided if required. The type of detector that would be recommended is an analogue type detector with a 4-20mA signal. This will allow for detection of varying levels of CO, typically in the ranges 0-30, 30-50, >50 PPM where the frequency of supply to the main fans can be adjusted accordingly via the main control panel.

Jet Fan units would be installed at ceiling level and positioned accordingly within the car park to provide the best distribution of the inlet air flow as possible.

The final installed locations of the Jet fans and mode of operation of these fans would be

determined at the time of the detailed design in which techniques of Computational Fluid Dynamics (CFD) will be used to model the air movement with the car park. A more detailed description of the CFD to be carried out can be provided upon request.

Control equipment:

(8+8+8) 24 Nos. for basement floor On / off type carbon monoxide (CO) detection. With CO detection in place the ventilation system would run on demand during peak periods when there is highest car park activity. The benefit of this over the conventional approach is ventilating all the time at 6 ACPH will be seen in reduced operating costs and noise levels. Incoming electrical supply Dual Incomer

CO GAS DETECTOR KEY ELEMENTS OF DESIGN IN VIEW TO ACHIVE ENERGY SAVINGS:

System with combination of Air cooled and Water cooled screw chillers. Chillers with R-134a Eco-friendly Refrigerant gas. Variable speed Pumping to save energy during diversified loads of Offices. Use of IBMS system to run the system efficiently by close monitoring and trends.




ENERGY CONSERVATION AND ENVIRONMENTAL CONCERN WITH THE INCREASE IN DEMAND OF ENERGY CONSUMPTION, I.E ELECTRICITY, THE

AVAILABILTY OF POWER BECOMES A MAJOR CONCERN.

SINCE THE CONSUMPTION OF POWER IS DIRECTLY RELATED TO GENERATION USING FOSSIL

FUELS, ITS EVIDENT THAT IT IS HARMFUL TO THE ENVIRONMENT. HENCE THE DESIGN ADOPTED FOR THIS COMMERCIAL COMPLEX IS IN VIEW OF NOT ONLY

ATTAINING MAXIMUM DEMAND POWER FOR HVAC TO BE ECONOMISED, BUT ALSO TO HAVE

ENERGY EFFICIENT SYSTEM.

APPROVED MAKES OF MATERIALS

AIR / WATER COOLED CHILLERS

COOLING TOWERS

AHUS / CSUS / FCUS TFAS

PRIMARY & CONDENSER WATER PUMPS

SECONDARY PUMPS

CLOSED LOOP EXPANSION TANK

AIR SEPERATOR / AUTO AIRVENT

MS PIPE

BUTTERFLY VALVES

PRESSURE INDEPENDENT BALANCING CUM CONTROL VALVES

Y STRAINER / SUCTION GUIDE

NON RETURN VALVE

PPRESSURE GAUGE & THERMOMETER

RPUF INSULATION

INLINE FANS

GI SHEET

GRILLES & DIFFUSERS / VCD / FIRE DAMPER

CLOSED CELL NITRILE RUBBER INSULATION




5.8 SCHEMATIC DIAGRAMS HEAT LOAD SUMMARY

The overall AC load estimate works out to be about 1492.0 TR and by applying the diversity, it is proposed to install 1300.0TR of air conditioning plant.


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