Hello all, I can't find the baseline minimum outdoor air temperature for DX heating coils? At what temperature should I cut out the compressor and have the electric resistance heating coil take over?
Are you referring to Baseline modeling e.g. systems 2 and 4? If yes, according to G3.1.3.1 it is 4oC. However, if you are going for LEED 4.1 thus 90.1-2016, then they added that the heat pump needs to keep operating when the electric resistance operates.
Hi thank you so much for your response. I'm working on LEED v4.0, which is ASHRAE-2010. Yes, the baseline is system 2 and 4. Section G3.1.3.1 has changed. In the 2010 version it says,
G3.1.3.1 Heat Pumps (Systems 2 and 4). Electric air-source heat pumps shall be modeled with electric auxiliary heat. The systems shall be controlled with multistage space thermostats and an outdoor air thermostat wired to energizeauxiliaryheatonlyonthelastthermostatstageandwhenout-door air temperature is less than 40°F.
Asked: 2024-11-19 10:54:20 -0600
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Last updated: Nov 20
