[Trace-users] Campus Chilled Water vs 90.1 Baseline Chiller

[Beaton, Christine]

Martin:
Per the attached document (see link), for LEED, you will have to do a
Step 1 model where you compare your building design to the baseline with
both as purchased chilled water so you wouldn't be comparing a chiller
to purchased chilled water.  Then, in the Step 2 model, you would
compare your chiller (campus system, district cooling, whatever) to an
ASHRAE chiller.  This amends Appendix G.

http://www.usgbc.org/ShowFile.aspx?DocumentID=4176

-Christine


-----Original Message-----
From: trace-users-bounces at lists.onebuilding.org
[mailto:trace-users-bounces at lists.onebuilding.org] On Behalf Of Steve
Mettlach
Sent: Wednesday, January 20, 2010 4:00 PM
To: trace-users at lists.onebuilding.org
Subject: Re: [Trace-users] Campus Chilled Water vs 90.1 Baseline Chiller

When you are modeling purchased chilled water, you are basically setting
up a chiller with a COP equal to one.  So if you are comparing a
baseline building with a chiller (COP equal to 4.9), you can expect the
purchased chilled water energy to be 4.9 times greater than the
purchased chilled water energy for an equivalent cooling load.

Steve Mettlach



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Today's Topics:

   1. Campus Chilled Water vs 90.1 Baseline Chiller (Snarski, Marty)


----------------------------------------------------------------------

Message: 1
Date: Wed, 20 Jan 2010 13:51:49 -0600
From: "Snarski, Marty" <msnarski at shwgroup.com>
To: <trace-users at lists.onebuilding.org>
Subject: [Trace-users] Campus Chilled Water vs 90.1 Baseline Chiller
Message-ID:
	<078AC5207CEDE145A8C7C74FFB3975A070F783 at DALEXC1.shwgroup.com>
Content-Type: text/plain; charset="us-ascii"

Hello, all.

 

I'm working on a DD-level Energy Model, and am having some trouble with
the results.

 

My Design Building will use campus chilled water, and campus steam.
I've modeled those per the instructions in the TRACE User Manual.

 

My Baseline Building is a System 7, and is therefore modeled with a
chiller (screw-chiller >150, <300 tons), and a boiler.

 

The overall cooling loads for the  two alternatives are:

Baseline: 548.1 tons

Design: 393.1 tons

 

On the PRM Summary, however, the Space Cooling energy is coming up at:

Baseline: 765.0 (10^6 Btu/yr)

Design: 3659.7 (10^6 Btu/yr)

 

It seems to me there should be an energy savings with chilled water,
over the chiller.  At any rate, it seems strange to me that there'd be
an increase of Cooling Energy of 5 times, to meet a smaller load.

 

Might anyone have any suggestions?

 

Thanks!

 

 

Martin Snarski   LEED(r) AP 
Mechanical Engineer 



 



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