Simultaneous performance factors for combined multifunctional ground-source heat pumps
Ground-source heat pumps can simultaneously or alternately supply space heating or cooling and domestic hot water with high energy effi ciency. They may have different output capacities and performance factors depending on operating modes. A combined, multifunctional ground-source heat pump for simultaneous space heating (with direct condensing radiant fl oor or air coil) and cooling (with air coil), and domestic hot water heating (with desuperheater) has been developed at Hydro-Québec Research Institute’s LTE Laboratory. For this brine-to-refrigerant/air heat pump designed for the eastern Canadian cold climate, simplifi ed testing and simultaneous performance factors calculation methods based on the ASHRAE 137 standard are proposed.