[Equest-users] District Heating and District Cooling

Lam, Linda linda.lam at wspfk.com
Wed Feb 4 11:20:28 PST 2009


Thanks Matt,
 
I was confused by the line right after the lines you quoted for me, on page 7: "The DES central plant itself shall always be modeled as a total, entire unit." 
 
Unfortunately I don't think we have a part load curve for the CUP yet.  Do you have a sense of how off my energy use will be?  I'm guessing the default PL curve for Electric Centrifugal Chiller is on the conservative side...
 
Best,
Linda
 
Linda Lam, LEED® AP
WSP Flack + Kurtz
405 Howard Street, Suite 500
San Francisco, CA 94105
Direct: 415.402.5813
Main Tel: 415.398.3833
Fax: 415.433.5311
website: http://www.wspfk.com
vCard: http://vcards.wspfk.com/vcardloader.php?filename=flackkurtz-linda-lam-wspfk-com-1227040073.vcf
image: <http://vcards.wspfk.com/usercard.php?filename=flackkurtz-linda-lam-wspfk-com-1227040073.png>   
 

________________________________

From: Matthew Dubrovich [mailto:mdubrovich at emcengineers.com] 
Sent: Wednesday, February 04, 2009 11:13 AM
To: Lam, Linda; equest-users at lists.onebuilding.org
Subject: RE: [Equest-users] District Heating and District Cooling



Linda, 

 

Page 7 of the LEED document instructs you to "use a virtual heating plant with the same seasonal heating efficiency of the entire upstream DES heating system" and goes on to say that it is permissible to model part load conditions.  There is similar wording for the CHW plant.  You don't need to use the actual capacities of the plants or the attached loads, just the actual efficiencies (and an estimate of the part load curve possibly).  Which is much simpler than trying to account for everything else attached to the plant.

 

 

Matt Dubrovich, P.E.

LEED AP

Project Engineer

 

EMC Engineers, Inc.

www.emcengineers.com <http://www.emcengineers.com/> 

Making buildings work.  Better.

(303) 974-1200

(303) 974-1217 - direct

(303) 974-1239 (fax)

 

Confidentiality Notice: This message and any materials attached are confidential, and are intended solely for the use of the addressee. If you are not the intended recipient, be advised that unauthorized use, disclosure, copying, or distribution is strictly prohibited. If you received this message in error please notify the sender and destroy your copy immediately. 

 

From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Lam, Linda
Sent: Wednesday, February 04, 2009 9:19 AM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] District Heating and District Cooling

 

All,

 

I am trying to model a building that will have chilled water and hot water supplied by a Central Utility Plant.  According to the attached "Required Treatment of District Thermal Energy in LEED-NC version 2.2 (May 28,2008)", there will be 4 models required.  The first set of 2 with purchased CHW and HW.  The second set of 2 with the entire CUP modeled in the Proposed case and a boiler/chiller plant autosized for the Baseline case.  

 

If that reasoning is correct, then how do I account for the energy used by the other buildings using the CUP?  Do I add it on as Process Energy on my Chilled Water and Hot Water loops? How do I calculate the load on the Condenser Water loop? What if I don't know what the loads in the other buildings are?

 

Thank you in advance!

Linda

 

  Linda Lam, LEED® AP
WSP Flack + Kurtz
405 Howard Street, Suite 500
San Francisco, CA 94105
Direct: 415.402.5813
Main Tel: 415.398.3833
Fax: 415.433.5311
website: http://www.wspfk.com
vCard: http://vcards.wspfk.com/vcardloader.php?filename=flackkurtz-linda-lam-wspfk-com-1227040073.vcf
image: <http://vcards.wspfk.com/usercard.php?filename=flackkurtz-linda-lam-wspfk-com-1227040073.png>   

 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20090204/b92007d9/attachment-0002.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: image/png
Size: 266 bytes
Desc: image001.png
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20090204/b92007d9/attachment-0002.png>


More information about the Equest-users mailing list