[Bldg-sim] Appendix G: G3.1.1.1 Purchase heat

[Kristin Field]

Xiaowei,

It's my understanding that both the Baseline and the Proposed models will both have purchased heat if that's what the Proposed Design has.

Kristin


***************************************************************
Kristin M. Field, EI
Energy Analysis Group
Architectural Energy Corporation
2540 Frontier Ave., Suite 201
Boulder, CO  80301
303.444.4149




>>> "Xu, Xiaowei" <xiaowei.xu at ny.fk.com> 2/13/2008 3:58 PM >>>

Hi, All
I have a question about the purchased heat.
I looked at the standard 2004 Appendix G3.1.1.1 Purchased Heat. 
It is said: For systems using purchased hot water or steam, hot water or steam costs shall be based on actual utility rates, and on-site boilers shall not be modeled in the baseline building design.
 
However in Standard 2004 User Manual, about the purchased heat, it is said: 
Purchased Heat (§ G3.1.1.1) For proposed building systems using purchased hot water or steam, the baseline building shall use the same hot water or steam source as used for the proposed building, but with on-site boilers. Costs shall be based on actual utility rates for the purchased steam or hot water.
 
So which one is correct? Definitely, for the baseline case, using the on-side boiler or not would bring a huge difference to the energy consumption for the heating and hot water because of the boiler efficiency curve. Has anyone had this problem before? Thanks a lot. 
 
 
Xiaowei Xu
Engineer          
 FLACK + KURTZ
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New York, NY 10017
 
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xiaowei.xu at ny.fk.com
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