COP of a Heat Pump Used for Home Heating
At steady-state, a house loses 10 kW of heat to the surroundings when the outdoor temperature is 0oC and the indoor temperature is 22oC. This energy must be replaced by a heat pump that uses R-134a as the working fluid.
Assume evaporator effluent is a saturated vapor and the condenser effluent is a saturated liquid. Assume the compressor has an isentropic efficiency of 85%.
a.) Determine the operating pressures for the evaporator and condenser that provide at least a 10oC driving force for heat exchange at the inlet and outlet of the evaporator and the condenser.
b.) Calculate the mass flow rate of the R-134a, the power requirement of the compressor and the COP of the heat pump.