Question

A geothermal heat pump is used in winter for space heating by getting heat from the ground at 15 °C. The working fluid in the heat pump is R134a. The compressor inlet is at 400 kPa and the compressor exit is at 2 MPa and 60 C. The mass flow rate of the refrigerant is 0.1 kg / s and the temperature difference in the air flow in the condenser section is 12 C. The refrigerant is subcooled to 15 C at the throttling valve inlet. The specific heat of water is 4200 /kgk and the specific heat of air is 1000 kJ /kg. Calculate

a . The compressor power

b . The refrigerant temperature at the hot water tank exit

c . The evaporator cooling load

d . The condenser heat rate

e. The air mass flow rate

f. The compressor isentropic efficiency

Answer 1

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