A heat pump with refrigerant 134a is used maintain a house at 25 °C by absorbing heat from a geothermal water source at 60 °C at a rate of 0.065 kg/s. The geothermal water exits the evaporator at 40 °C. The refrigerant leaves the expansion valve as a saturated mixture at 12 °C with a quality of 15%. After passing through the evaporator, the refrigerant exits as saturated vapor as 12 °C. The compressor uses 1.6 kW of power.
a) What is the rate of heat supply from the water?
b) What is the mass flow rate of the refrigerant?
c) What is the actual heat pump COP for this system?
d) What is the maximum possible heat pump COP for a system operating between the two reservoirs?