[Bldg-sim] Campus Chillers

[Vikram Sami]

Also - if you're doing this for LEED documentation and the project was
registered AFTER May 28th 2008, you will need to comply with the
modeling protocols in this document:

 

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

 

 

Otherwise, the best way to do this is to get the rates (as James has
described below) and set up a steam meter and utility rate based on the
rate. Make sure that the chilled water rate calculated takes into
account the cooling tower loads as well. 

 

Lastly - you will find that when you model the chilled water rates, your
utility bills probably go down (or they should), while your energy use
goes up.  I had a similar issue and was confused, until it was pointed
out to me that the cooling energy reported in the BEPU report is
actually the space cooling load and not the actual energy. In reality,
if you have a campus chiller that runs at 0.65 kW/ton and with cooling
tower energy (pumps fans etc) it goes up to 0.75 kW/ton, then you need
to factor that in to get the actual cooling energy. Keep in mind - you
only need to factor in the heat rejection energy (cooling tower fans &
pumps) - not the chilled water loop energy - that should already be
modeled. If your COP of the system - chiller+heat rejection is 4 (for
simplicity), then your actual cooling load is 1/4th the reported load. 

 

Hope this helps

Vikram Sami, LEED AP 
Direct Phone 404-253-1466 | Direct Fax 404-253-1366 

LORD, AECK & SARGENT ARCHITECTURE
1201 Peachtree Street NE, Suite 300, Atlanta, GA 30361 
Responsive Design * Technological Expertise * Exceptional Service 
Please visit our new website | www.lordaecksargent.com
<file:///\\www.lordaecksargent.com\> 

P Think GREEN before you print.

 

 

From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of James V.
Dirkes II P.E.
Sent: Monday, December 29, 2008 11:17 AM
To: 'Gregg Liddick'; bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] Campus Chillers

 

Dear Gregg,

 

With some luck, the campus will know how they've derived the ton-hr
billing rate and you could apply those unit rates and overhead factors
to your single building.  Much of the time,  though, the billing rates
are "seat of the pants"-based or were developed long ago by people who
no longer work there.....  Good luck!

 

The Building Performance Team
James V. Dirkes II, P.E., LEED AP
1631 Acacia Drive NW
Grand Rapids, MI 49504
616 450 8653

 

 

 

________________________________

From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Gregg
Liddick
Sent: Monday, December 29, 2008 10:54 AM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] Campus Chillers

I'm trying to figure out a way to model utility rates using a campus
chiller.  The building is billed by the ton of chilled water used.  If
anyone can help me find a way to do this it would be greatly
appreciated.

 

Best Regards,

 

Gregg Liddick, LEED(r) AP

 

The Epsten Group, Inc.

429 Edgewood Avenue

Atlanta GA 30312

Phone: 404-577-0370  ext. 102

Fax: 404-577-1739

gliddick at theepstengroup.com

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