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

[Karen Walkerman]

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
>
> 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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