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Forum discussion

NC-2009 EAp2:Minimum Energy Performance

Baseline heating set-point when no heating system exists

Ricardo Sá

Director of Sustainability

Edifícios Saudáveis Consultores (503 910 767)

LEEDuser Basic Member

79 thumbs up

Project location :

April 17, 2015

According to ASHRAE 90.1 (2007) Table G3.1 - 10 c, "where no heating systems exist, HVAC system shall be assumed to be electric". Considering a space that has a cooling system but not a heating system, can you please clarify: 1) which shall be the "virtual" heating set-point for these spaces? 2) in the particular situation of a factory where the space temperature is allowed to fluctuate down to 10ºC, can the "virtual" heating system be adjusted (because good thermal comfort levels are not expected)?

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Marcus Sheffer

LEED Fellow

7group / Energy Opportunities

LEEDuser Expert

4454 thumbs up

Fri, 04/17/2015 - 13:45

Adding systems that do not exist in the design is required for both heating and cooling. The easy work around is to set the temperature in the space so that the system never comes on. As long as you have the same temperature in both models this is allowed. So adding a system that does not exist is just a waste of time. What I do is tell the reviewer that I am aware of this work around and therefore did not go to the effort required to model the system. The end result is the same so the reviewer should accept it.

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