The standard states that where the proposed building's HVAC system includes a water loop heat pump that supplies conditioned air to a thermal block or conditioned water to a hydronic loop, the reference building's HVAC system for that thermal block shall be selected using Table 8.4.4.8.A.
However, in this case the reference building's HVAC system for that thermal block or for the thermal blocks supplied by the hydronic loop shall be an air-source heat pump described in Table 8.4.4.14.
A series of NECB specific air source heat pumps have been provided in the ApacheHVAC NECB systems library:
Figure 4: NECB Heat Pumps
The part load performance of these heat pumps have been compiled based on the data provided in Table 8.4.4.22.E.
The user will have to manually assign these to the reference model in cases where it is applicable. The auxiliary heating source and type will also have to be assigned by the user based on the guidance provided in NECB-2011 section 8.4.4.14.
