[bldg-sim] Using Sea / Lake Water as Condenser Water

[Mike Tillou]

You are pretty limited in what you can do here.
 
The Lake/Well condenser water option is only for heat pumps and not for
water cooled chillers.
 
The obvious problem with using a cooling tower and simply setting the
fan energy to zero is you don't get to take advantage of the improved
chiller performance as a result of using colder condenser water.  
 
One work around might be: 
 
Assuming the lake/well is going to supply a pretty constant condenser
water temperature, say 55-60F.  You could try setting up a condenser
loop that always supplies water at a constant temperature say 85F using
a cooling tower with fan energy set to zero.  To capture the improved
performance of the chiller modify the chiller performance curves so that
the performance at 85F matches the expected performance with the
lake/well water at 55F-60F.    
 
This approach should give you a reasonable answer if you calibrate it
correctly.

Michael Tillou, PE 
ETC Group, Inc - Energy Engineering for a Sustainable Future 


	-----Original Message-----
	From: bldg-sim at gard.com [mailto:bldg-sim at gard.com] On Behalf Of
Jaya Mukhopadhyay
	Sent: Wednesday, November 29, 2006 5:59 PM
	To: bldg-sim at gard.com
	Subject: [bldg-sim] Using Sea / Lake Water as Condenser Water
	
	
	We are proposing a system  which uses sea water as condenser
water thus eliminating the use of a cooling tower. I am trying to model
this system in eQuest. 
	The following are the errors which I get on running the program:
	1) The program throws up an error asking for a primary cooling
equipment when I simply run the 'Lake Water' option for the condenser
water loop.
	 2) The program does not accept the 'Lake water' option for the
condenser water loop when run along with a cooling tower the program. I
receive an incompatibility message.
	Is there a way I can model such an arrangement? 
	If not!
	Is there a way in which I can trick the program to simulate such
an arrangement?
	Any help and/or advice would be greatly appreciated.
	Thank you
	Jaya Mukhopadhyay

	
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