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

Keith Swartz kswartz at ecw.org
Mon Mar 17 11:32:51 PDT 2008



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



Keith Swartz, PE, LEED(r) 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 <http://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 PM
To: bldg-sim at lists.onebuilding.org
Subject: [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?


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