[BLDG-SIM] LEED ECB Question - System 6 Components

[Jeff Haberl]

Don't forget that your simulation will require at least 4 loops to select the number oif chillers, type of chiller, and efficiency. Similar issues are involved with the boiler DHW, pumps and fans. You can find a paper that gives some guidance on the procedure we have developed behind the Texas emissions calculator at ecalc.tamu.edu, go to the public tab under reports, and select the ICEBO paper on the commercial building. Even with this approach DOE-2's autosizing remains probnlematic when using pre-calculated weighting factors and SC/U-values for windows (versus Windows 5). Another tricky issue is the zoning, which can drift in and out of minimum VSD requirements for fans in 90.1-1999. 

Jeff
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Jeff S. Haberl, Ph.D., P.E.............................jhaberl at esl.tamu.edu

Professor......................................................Office Ph: 979-845-6507

Department of Architecture.......................Lab Ph: 979-845-6065 

Energy Systems Laboratory.......................FAX: 979-862-2457 

Texas A&M University..............................77843-3581

College Station, Texas, USA.......................URL: www-esl.tamu.edu

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-----Original Message-----
From: BLDG-SIM at gard.com
To: BLDG-SIM at gard.com
Sent: Tue Apr 18 14:21:13 2006
Subject: [BLDG-SIM] LEED ECB Question - System 6 Components

I am looking for some guidance from ASHRAE 90.1 modelers.  I have a couple of projects in Chicago where the proposed system is comprised of ground loop-coupled water-to-air heat pumps.  My question is regarding compliance with ASHRAE 90.1-1999 ECB method (the projects are to be LEED v2.1 certified).  I am using eQuest v3.55.  Given that we are using the ground loop and this is a non-residential multi-zone project, I have to use the ECB Budget System 6 (constant volume Water-source heat pumps with DX cooling and boiler heating) as the Budget System.  That seems straight forward, except that I am not sure how to handle heat rejection from the condenser/DX coil on the heat pumps for a small building given the limited guidance in 90.1-1999.  
 
In most cases I would use a cooling tower for heat rejection from the condenser loop as the Budget System.  Has anyone had successfully proposed using a cooling tower/fluid cooler for  the ECB Budget System 6 for a relatively small system (less than 12 tons of cooling load) with the USGBC?  It seems like overkill to me to use cooling tower with an additional pump and head loss, and the percent of energy saved over the GLHP system reflects that.  I know that Appendix G's Budget System in my case would be a packaged HP with an air-cooled condenser for rejection.  But I want to find out if there is any precedent for the heat rejection for 90.1-1999's Budget System 6.  Any help you could give me would be great.
 
Patrick Dolan
Serena Sturm Architects, Ltd.
3351 Commercial Ave.
Northbrook, IL  60062
847-564-0370, ext. 24 voice
847-205-5089, fax
 
 


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