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

[Leonard Sciarra]

remember, appendix G was designed to capture the typical building in the
typical state across all climate zones.
 

 

                                                    
Leonard Sciarra, AIA, LEED(r) ap
Associate
312.577.6580  Direct
312.456.0123  Main
leonard_sciarra at gensler.com <mailto:leonard_sciarra at gensler.com> 
                                                     
Gensler
30 West Monroe
Suite 400
Chicago, Illinois 60603
USA 

 

________________________________

From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Andrew
Chiasson
Sent: Monday, March 17, 2008 6:36 PM
To: Karen Walkerman
Cc: bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] FW: LEED system selection for GSHP


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



________________________________

	Date: Mon, 17 Mar 2008 15:09:26 -0400
	From: kwalkerman at gmail.com
	To: kswartz at ecw.org
	CC: bldg-sim at lists.onebuilding.org
	Subject: Re: [Bldg-sim] FW: LEED system selection for GSHP
	
	Thanks 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(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?
		
		~Karen~
		

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	-- 
	Karen Walkerman
	Second Law Consulting
	802-238-0980
	kwalkerman at gmail.com 


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