Air-to-Air Heat Pump
The Air to Air Heat Pump equipment library member simulates the performance of the compressor, condenser, and evaporator in a heat pump system. If modeling a Packaged Terminal Heat Pump, which includes the supply fan, the Air to Air Heat Pump is considered a Heat Pump Component within its library member. Otherwise the Air to Air Heat Pump itself can be added to the system diagram of a new airside system (e.g. Single Duct VAV System) and modeled as one heat pump serving multiple spaces. In this case a fan equipment library member would also need to be added to the system diagram in Configure Systems.
The Air to Air Heat Pump houses a collection of performance curves in the Curve Tab which represents operation at the various speed levels. These curves are generated from Reference Unit catalog data and can include up to 10 speeds of operation. The rated conditions for obtaining the capacities, COPs, and SHRs are at an indoor dry bulb temperature of 80˚F (26.67˚C), wet bulb temperature of 67˚F (19.44˚C), and a condenser entering air temperature of 95˚F (35˚C).
The Rated Cooling Capacity and Rated Cooling Airflow Rate on the Product tab are the actual design cooling capacity and airflow rate present per the input building model. These rated capacities and airflows are used to determine the corresponding capacities and airflows at the various speed levels in simulation.
