[Bldg-sim] FW: LEED system selection for GSHP

[Andrew Chiasson]

Why not choose a heat pump with a boiler and cooling tower as the baseline?


Date: Mon, 17 Mar 2008 15:09:26 -0400From: kwalkerman at gmail.comTo: kswartz at ecw.orgCC: bldg-sim at lists.onebuilding.orgSubject: Re: [Bldg-sim] FW: LEED system selection for GSHPThanks for all the comments.  This is for LEED EA Credit 1.  The system has no fossil fuel supplementation, so PSZ-HP it is.  The poor baseline benefits the project in terms of LEED points, however, this leads to something I've been thinking...Why not use the same baseline for all buildings?  Or at least make baseline system selection appropriate for different climate zones.  This baseline would make choosing electric resistance heat look somewhat reasonable in this climate.  Use of electric resistance heat is actually no longer legal in the state of Vermont for commercial construction.~Karen~
On Mon, Mar 17, 2008 at 2:32 PM, Keith Swartz <kswartz at ecw.org> wrote:



Karen,
 
I agree with your interpretation -- the system would be 4-PSZ-HP – assuming you are using the 2004 edition of ASHARE 90.1. The User's Manual states that if the heating energy source for the proposed building is electricity, then the heating energy source for the baseline building has to be electricity too. This system would not actually be used in Wisconsin either. Fortunately for me, the utility programs that I model for allow me to use "engineering judgment" (common sense), so I can use a realistic system for the baseline. But if you have to go by the book, then 4-PSZ-HP it is! I can see how this could overstate the savings for a ground-source heat pump system in a cold climate like ours.
 

Sincerely,
Keith Swartz, PE, LEED® AP
Energy Center of Wisconsin
455 Science Drive
Suite 200
Madison, WI 53711
 
Phone: 608-238-8276 ext. 123
Fax:     608-238-0523
www.ecw.org
The Energy Center of Wisconsin is an independent, nonprofit organization that seeks solutions to energy challenges.




From: Karen Walkerman [mailto:kwalkerman at gmail.com] Sent: Friday, March 14, 2008 12:36 PMTo: bldg-sim at lists.onebuilding.orgSubject: [Bldg-sim] LEED system selection for GSHP
 
Hello friends,Anyone know what the BASELINE system should be if the design system is a ground source heat pump?  I have a non-residential building, 3 floors and < 75,000 square feet.  The design system type is groundsource heat pump, which leads to system 4-PSZ-HP, which nobody would ever choose for this climate (Burlington, VT).Any thoughts?~Karen~_______________________________________________Bldg-sim mailing listhttp://lists.onebuilding.org/listinfo.cgi/bldg-sim-onebuilding.orgTo unsubscribe from this mailing list send  a blank message to BLDG-SIM-UNSUBSCRIBE at ONEBUILDING.ORG-- Karen WalkermanSecond Law Consulting802-238-0980kwalkerman at gmail.com 
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