[Bldg-sim] Chiller Efficiency

[James Hansen]

Finding, say, a 500-ton centrifugal chiller with a rated COP of 7.625
(6.1 required by ASHRAE * 1.25) is not going to be an easy task.

 

I think you should look at finding a chiller whose annual energy
consumption is 25% less than an ASHRAE 90.1 chiller (ie 25%
"better")...that's a much more reasonable expectation, given
frictionless bearings, VFDs, etc.

 

GHT Limited
James Hansen, PE, LEED AP

Senior Associate

1010 N. Glebe Rd, Suite 200

Arlington, VA  22201-4749

703-338-5754 (Cell)

703-243-1200 (Office)

703-276-1376 (Fax)

www.ghtltd.com <http://www.ghtltd.com/> 

 

 

From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of amit
bhansali
Sent: Thursday, March 25, 2010 12:56 PM
To: Kimball, Matthew
Cc: bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] Chiller Efficiency

 

Well, the baseline COP are measured at standard testing conditions. So i
am not debating the fact the COP would be constant. I just needed to
know that what does increase in 25% efficiency actuallu mean. I
personally thought having a chiller whose kw/ton was lower than that
recommended  by ASHRAE 90.1 would be good. Needed to confirm that.

 

Thanks  for the input

On 25 March 2010 11:51, Kimball, Matthew <Matthew.Kimball at jacobs.com>
wrote:

Maybe you can tell me what the COP of a chiller means then, given that
it varies with load, how do you come up with a single COP for a chiller?
Or is it just the average COP given the operating conditions that the
chiller experiences?  Or are you talking about the integrated part load
value?  

 

But yes, however you define the efficiency, (COP, EER, or Power/Ton), I
am geussing that the load removed per unit of input will have to
increase by 25%.

 

Matthew Kimball

 

 

________________________________

From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of amit
bhansali
Sent: Thursday, March 25, 2010 11:49 AM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] Chiller Efficiency


Hi Bldg-Sim Community,

I had a confusion that you all might be help out.

When someone says that they want a chiller with 25% more efficiency than
the baseline dictated by ASHRAE 90.1, does it mean the COP should be 25%
greater?
-- 
Thanks

Sincerely,
Amit Bhansali, M.S. , EIT
Command Commissioning, LLC
8410, Sterling St
Irving, TX  75063 

www.command-cx.com <http://www.command-cx.com/> 

Please do not print this e-mail unless necessary

 

 

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-- 
Thanks

Sincerely,
Amit Bhansali, M.S. , EIT
Command Commissioning, LLC
8410, Sterling St
Irving, TX  75063 

Office :(972)-929-1199 (Ext:328)
Mobile: (+1)972-207-5180
            (+1)405-312-1047

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Please do not print this e-mail unless necessary


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