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Unformatted text preview: H mh2 h3 0.05270.22 86.78 9.172 kW c) The coefficient of performance is Q
7.354 4.045 COPR L Win 1.818 Problem 4 (10 points) A refrigerator uses refrigerant‐134a as the working fluid and operates on an ideal vapor‐
compression refrigeration cycle between 0.12 and 0.7 MPa; however, the cycle has been modified to include an isentropic turbine instead of a throttle. The mass flow rate of the refrigerant is 0.05 kg/s. Show the cycle on a T‐s diagram with respect to saturation lines. If an isentropic turbine replaces the throttling valve, determine the percentage increase in the COP and in the rate of heat removal from the refrigerated space. Answers: 30% and 4% Solution The T‐s diagram becomes T
P2 = 0.7 MPa
wout 2 win P1 = 0.12 MPa...
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This homework help was uploaded on 03/02/2014 for the course CHEM 1010 taught by Professor Staff during the Spring '08 term at Utah State University.
- Spring '08