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

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

From: "Mike Tillou" <miket@xxxxxxxxxx>

Date: Thu, 30 Nov 2006 10:58:55 -0700

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

Title: Message

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@xxxxxxxx [mailto:bldg-sim@xxxxxxxx] On Behalf Of Jaya Mukhopadhyay
Sent: Wednesday, November 29, 2006 5:59 PM
To: bldg-sim@xxxxxxxx
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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