4-pipe Chillers & Repat Hospital Case Study€¦ · Repat Case Study Issues • No proper cooling...

transcript

Welcome to tonight’s AIRAH TAS Division Technical Seminar

4-pipe Chillers & Repat Hospital Case Study

This event is proudly sponsored by

4-pipe Chillers & Repat Hospital Case Study

Welcome Tonight’s Presenters:

Julian Cook – COVA, AIRAH TAS President (Consultant)Giulio Martinelli – Eurothermal (Supplier)

Chris Wright – TCM (Contractor)

Topics

• 4-pipe Chiller Operation• Repat Hospital Case Study• Site Visit

4-Pipe Chillers

Giulio Martinelli - Eurothermal

Multifunctional units

What are multifunctional units?

Where should multifunctional units be installed?

Why are multifunctional units an efficient solution?

HEATING EXCHANGER

COOLING EXCHANGER

BUILT-INPUMPS

ANTI-ICING CIRCUIT SCROLL

COMPRESSORS

COILS CONTROLLER

Polyvalent units are air/water hybrid systems used for simultaneous generation of hot and cold water.

The system is designed to allow excess in either cooling or heating to be discharged via the air-cooled heat exchanger (coils).

Multifunctional units can produce :

- only cooling

- only heating

- heating & cooling simultaneously

MULTIFUNCTIONAL UNITS

Cooling

Heating

No Requests

TYPICAL INSTALLATIONS

Jan Feb Mar Apr may Jun Jul Aug Sep Oct Nov Dec

SUMMER

WINTER

SUMMER

The ideal installation for multifunctional units are buildings with inhomogeneous heating and cooling load such as:

- Buildings with extensive glass surfaces and double sun exposure

- Hospitals- Hotels- Shopping centers- School- Art centers- Sport centers

Cooling

Heating

No Requests

SUMMER

WINTERSUMMER- Need of GAS

- Co2, Nox etc discharge- High Opex- Installation of two

systems- Low efficiency

- Higher hot water temperature production 80 C

Traditional installations

The boiler produces the hot water while the chiller produces the cold water.

Built-in electrical heaters are used for heating purposes while the cold water is produced by the chiller, thus, a less efficient solution.

CHILLER + BOILER OR EL. HEATERS

Cooling

Heating

No Requests

CHILLER + HEAT PUMPS

SUMMER

WINTER

SUMMER

- High Capex- High Opex- High Installation cost - Large plantroom space

needed

- Medium efficiency solution

- No need for gas

Medium efficiency solution

The heat pump produces the hot water while the chiller produces the cold water. This solution does not maximise efficiency and has high installation and running costs.

Cooling

Heating

No Requests

SUMMER

WINTER

SUMMER

By far the most cost-efficient and effective solution

A single unit automatically controls heating and cooling set points maximising the efficiency in any season resulting in low installation and running costs.

- Low Opex- Low Capex- Hign Efficiency - Single unit installation- No need of Gas- temp production (55 C )

MULTIFUNCTIONAL

- Higher l/kw ratio compared to CH+HP

2,30 4.,40

3.703,60

4,602,0

EFFICIENCY INDICES COMPARISON

6,80 8,90

8,208,00

9,006,70

2,30 4,20

3,503,40

4,502,0

ANALYSIS POINT

BUILDING LOAD DEMAND

50 % COOLING 50 % HEATING

MULTIFUNCTIONALCHILLER 50 % + HEAT PUMP 50 %CHILLER 50 % + EL. HEATER

WITH 1 KW OF ELECTIRCITY, WE PRODUCE 8.66 KW OF LOAD ( HEATING + COOLING)

WITH 1 KW OF ELECTIRCITY, WE PRODUCE 4.16 KW OF LOAD ( HEATING+ COOLING )

WITH 1 KW OF ELECTIRCITY, WE PRODUCE ONLY 2.6 KW OF LOAD ( HEATING+ COOLING

23C AMBIENT TEMPERATURE

2,30 4.,40

3.703,60

4,602,0

AUTUMN WINTERSUMMER

UP TO 40%ENERGY SAVINGS

ALL YEAR ROUND SAVINGS WITH MULTIFUNCTIONAL TECHNOLOGY

SPRING SUMMER

Thank you for your attention

Case Study - Design

Julian Cook - COVA

Repat Case Study

Peacock Building Hospital• Lower Ground Palliative Care “Whittle Ward”• Ground Admin / Rehab• L1 New Ward• L2 Ward• L3 WardOther miscellaneous buildings

Repat Case Study

Existing System• 2 x 1200 kW Electrode Boilers• 1 x Tempered air AHU

– Heat Recovery Heat Pumps for cooling

• 1 x Double Duct AHU– L2 + other specific areas– Heating only

• Under-window Radiators on floors

Repat Case Study

Issues• No proper cooling• Poor zoning • Very high energy usage

– Electric Boilers– 86 kL of hot water storage– Rooftop “spa”

• Original plant age, maintenance & reliability– Boilers, Chiller, Controls, Pipe blockages

Repat Case Study

Design Challenges• Improve thermal comfort• Rectify Zoning

– Minimise re-heat/re-cool

• Maintain comfort throughout duration• Concurrent L1 Ward Project• Setup building for next 25+ years

Repat Case Study

Zoning DiagramYellow = Temp AirGreen = AC AHUBlue = Exhaust

Repat Case Study

Existing Plant

Repat Case Study

Repat Case Study – Install

Construction Challenges• Maintain comfort throughout duration

– Planned for Summer– Delays resulted in Winter changeover– Temporary Gas Boiler

• Concurrent L1 Ward Project– Staging, site access

• Infection Control Requirements

Installation Challenges

- Changing over a hospital heating system in the early stages of Winter.-Lifting out the two 35,000 litre storage tanks each weighing 45 tonnes.

- Starting up the system and commissioning with a 30% load.- Two floor upgrade projects running simultaneously with the plant upgrade, two

Consultants and two Contractors but smooth sailing.- Using a new Heat Pump Chiller supplier with a new simultaneous Heating / Cooling Technology, PIC Valves throughout the Secondary Hydraulic Systems

Chris Wright - TCM

Repat Case Study

2/01/2019 12/01/2019 22/01/2019 1/02/2019 11/02/2019 21/02/2019 3/03/2019 13/03/2019 23/03/2019 2/04/2019

l Effi

TER 10 per. Mov. Avg. (TER)

Total Efficiency Ratio (TER)

Before & After Energy

Thanks…

Please join us for the site visit to the hospital

Special thanks again to BlueBox for sponsoring this event

4-pipe Chillers & Repat Hospital Case Study€¦ · Repat Case Study Issues • No proper cooling...

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