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

David S Eldridge DSE at grummanbutkus.com
Mon Mar 17 13:58:54 PDT 2008


The system selection does self-regulate to some degree based on the
predominant conditions in any particular location, climate and energy
prices.  I think it probably hits the mark much more than it misses in
Vermont, although you have found an exception.

 

As you mention, a project putting in PSZ-HP in Vermont is probably not
anywhere close to using Appendix G.  I doubt very many LEED projects in
that region end up taking the electric heating path, most will be on the
natural gas side.  Are you seeing many geothermal projects in the area?

 

Someday, if geothermal heat pumps became the conventional type of
system, then a revision to the standard would definitely be in order.

 

Obviously it would be misleading to tell your client that they are
saving that much money per year, you may want to perform some
intermediate system selection for that purpose.

 

David

 

 

 

From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Karen
Walkerman
Sent: Monday, March 17, 2008 2:09 PM
To: Keith Swartz
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.



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