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NC-2009 EAp2: Minimum Energy Performance

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System 7: selection of heating system

November 6, 2013

Roberto Oshiro Gama

LEEDuser Basic Member

November 6, 2013

I,m working on a project were the proposed building has 2 ground water heat pumps with total capaciyt approx. 2300 kW. According to ASHRAE G3.1.1 should I select the system 7, fossil fuel boiler for the baseline and in table 6.8.1 there is a equivalent heat pump.
Should I really select fossil fuel boiler for the base line or select an equivalent ground water heat pump?
thank you for your help.

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Marcus Sheffer

LEED Fellow
7group / Energy Opportunities

LEEDuser Expert

5909 thumbs up

November 6, 2013 - 9:36 am

If you have electric heat you would select a baseline system from the electric column in Table G3.1.1A. This would result in a system 8 assuming the same building area and # of floors.

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Roberto Oshiro Gama

LEEDuser Basic Member

November 6, 2013 - 10:54 am

but the heating system is convered by heat pump 50% and district heating 50%.
Should I calculate energy save differentlly for the fraction of from heat pump and from district heating?

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Marcus Sheffer

LEED Fellow
7group / Energy Opportunities

LEEDuser Expert

5909 thumbs up

November 6, 2013 - 11:23 am

If it is a hybrid system then a system 7 is right.

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