21 December 2007

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.