[Bldg-sim] Space Cooling Energy Consumption with GSHP

David S Eldridge DSE at grummanbutkus.com
Tue May 13 15:13:37 PDT 2008


As far as cooling energy goes, what are your design case cooling EIR with the geothermal system, and your baseline case cooling EIR for the air-to-air selections?

Is the heat pump fan power parameter the same in both cases, and modeled separately from the cooling energy?

David


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 4:53 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
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