[Bldg-sim] Space Cooling Energy Consumption with GSHP

Demba Ndiaye demba.ndiaye at setty.com
Wed May 14 06:05:25 PDT 2008


Thomas, 

 

You should definitively have more savings than that, even if there is
the pump energy. 

One first thing to check: the efficiency of GSHP should be much higher
than that of air-source heat pumps in both heating and cooling modes. 

 

______________

Demba Ndiaye

________________________________

From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Tom Butler
Sent: Tuesday, May 13, 2008 5:53 PM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] Space Cooling Energy Consumption with GSHP

 

I am modeling an apartment style dormitory for a project in Atlanta, GA.
Each of the 45 units is served by its own heat pump, along with a few
zones for public areas. For an energy efficiency grant application I
have compared the designed system, a ground source heat pump, with an
air source heat pump prescribed by 90.1. Other than the systems, the
models are identical. 

The energy use for space cooling is significantly higher for the GSHP
system (24,000 kWh vs. 17,000 kWh). Because the power required to run
pumps offsets the savings in heating energy, this destroys the rationale
for spending the extra money on the Ground Source Heat Pump, as well as
our chances of receiving the grant.

Has any one encountered this issue? 

 

Thanks 

tb 

Thomas Butler, LEED AP 
Direct Phone 404-253-1435 | Direct Fax 404-253-1335 

LORD, AECK & SARGENT ARCHITECTURE
Responsive Design * Technological Expertise * Exceptional Service 
www.lordaecksargent.com <file:///\\www.lordaecksargent.com>  

 

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