Problem 7-2 - Example 7-2 A heat pump with an ideal...

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Example 7-2 A heat pump with an ideal compressor operates between 0.2 MPa and 1 MPa. R134a flows through the system at a rate of 0.3 kg/s. The heat pump is used to heat a home that loses heat to the environment at a rate of 180,000 Btu/hr. Refrigerant leaves the compressor as a subcooled liquid. a) Draw a T-s diagram b) Find the temperature of R134a leaving the condenser c) Find the rate of heat transfer in the evaporator, in kW d) Find COP Solution: b) The first law for the condenser is () 23 HR Qm h h =− ± ± To find h 2 , use the second law on the compressor: 12 s s =
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1 kJ entropy(R134a, 200, 1) 0.9377 kg K sP x == = = 22 kJ enthalpy(R134a, 1000,
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This note was uploaded on 04/07/2008 for the course MANE 4010 taught by Professor Kaminski during the Spring '08 term at Rensselaer Polytechnic Institute.

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Problem 7-2 - Example 7-2 A heat pump with an ideal...

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