[Bldg-sim] high CWLT chiller performance curves

[Peter Simmonds]

Martin, let me try and understand your question a little better.

For different evaporator leaving temperatures you could simply contact
the manufacturers or as many have simply map the chiller as a
traditional Carnot cycle and deduce the efficiency from the
calculations.

I wrote a paper in 93 which is published in ASHRAE transactions dealing
with chilled beams and chiller efficiencies associated with running
chillers at say 13C-15C.

The only problem in the real world is that we often require at least 6C
for air handling units and to have a dedicated chiller for chilled
ceilings is a little extravagant. We usually run the chillers at 6C, but
at variable speed with of course variable evaporator flow. Bungane
Melamakulu and I wrote a paper on chiller efficiency for the IBPSA
conference in Colorado.

I do not wish this reply to seem as many replies that we have done this
before, but does this answer you question?

 

Peter Simmonds Ph.D.
Senior Associate, Advanced Technology Group

IBE Consulting Engineers
14130 Riverside Drive Suite 201
Sherman Oaks, CA 91423
p:   (818) 377-8220 ext. 246
f:    (818) 377-8230
m:  (818) 219-1284

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________________________________

From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Martin
Belusko
Sent: Thursday, January 08, 2009 3:15 PM
To: 'bldg-sim at lists.onebuilding.org'
Subject: [Bldg-sim] high CWLT chiller performance curves

 

Hi

 

I am looking for some chiller performance curves at elevated evaporator
temperatures for chilled ceiling systems in commercial buildings.
Manufacturers provide data up to 9 deg. C exit temperatures but not up
to 15 deg. C.  Ideally COP values at different evaporator, condenser and
load would be ideal for a water cooled chiller.

 

Regards

 

Dr. Martin Belusko

Research Engineer

Sustainable Energy Centre

University of South Australia

ph: +61 8 8302 3767

fx: +61 8 8302 3380

 

 

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