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[BLDG-SIM] Major disagreement on Chiller Performance Curves in DOE-2.1E and DOE-2.2

Title: Major disagreement on Chiller Performance Curves in DOE-2.1E and DOE-2.2
The easy way to settle that is to create a spreadsheet that uses the coefficients.  You can get them from the .bdl file if you enter DIAGNOSTIC COMMENTS .. right before your chiller instructions.  Interestingly enough, that's what I was doing this morning.  I have attached my spreadsheet.  Please excuse that it is not ready for distribution.  Just something I was playing with.
 
The coefficients are for DOE-2.2 and do include upgrades since the mid '70s that DOE-2.1E uses.  The VFD coefficients are new.
 
As you can see, kW/ton does change with temperatures.
 
If you want FIXED condenser water temperature and chilled water temperature (the default), do not turn on the resets.  Condenser water (and maybe chilled water) will still drift with what the equipment can do.
 
Mike
-----Original Message-----
From: postman@xxxxxxxx [mailto:postman@xxxxxxxx]On Behalf Of Aulbach, John
Sent: Wednesday, October 15, 2003 1:23 PM
To: BLDG-SIM@xxxxxxxx
Subject: [BLDG-SIM] Major disagreement on Chiller Performance Curves in DOE-2.1E and DOE-2.2

I am having a "friendly" disagreement with a colleague on what chiller curves to ask for from a manufacturer to input into DOE-2 (could be either 2.1E or 2.2). We both agree that the infamous ARI point for a 100% load should be input. But the curves are where we disagree.

Is the Default DOE-2 curve for % Power versus % Tons the ARI curve with the allowable reduction in condenser water temperature, or is it based on the FIXED 85°F entering condenser water and FIXED 44°F leaving chilled water ALL the way down the curve?

Therefore, when I am given a chiller with a variable speed drive installed, what parameters should I ask for in such a Power/Tons to be FIXED ???





John R. Aulbach, PE, CEM
Project Engineer
Sempra Energy Solutions
555 West Fifth Street
Mail Location 27F3
Los Angeles, CA 90013
Tel: (213) 244-8551 Cell (213) 219-4875
 

"Sempra Energy Solutions is not the same company as SDG&E/ SoCalGas, the Utilities.  Sempra Energy Solutions is not regulated by the California Public Utilities Commission, and you do not have to buy Sempra Energy Solutions products or services to continue to receive quality regulated service from the Utilities."  

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Attachment: DOE Chiller Coefficients.xls
Description: MS-Excel spreadsheet