Dear all,

I am modelling a hospital which is required to use System 7 in the baseline building. My question is about the heating source it should use. In the proposed model, I use an air-to-water heat pump to pre-heat the hot water, which then goes to a heat exchanger which uses heat from a District Energy System to warm up the water to the setpoint temperature. Therefore, the HVAC system in the proposed model is a hybrid.

I am not sure about the heating source in the baseline model. Should it be a fossil fuel boiler as suggested in Table G3.1.1.B? Or should it use the same source as the proposed model as noted in Section G3.1.3.2? And if this was the case, which of the two sources I have in the proposed model should I use, electricity or district heating?

Thank you all for your help!