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# HW_21 - a COP b The rate of heat supplied to the evaporator...

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Homework Assignment 5 1. A refrigerator uses R-134a as the working fluid and operates in an ideal vapor- compression refrigeration cycle between 0.16 and 0.6 MPa. The mass flow rate of the refrigerant is 0.10 kg/s. a. Show the cycle on a T-s diagram. b. Determine the rate of heat removal from the refrigerated space c. The power input to the compressor d. The rate of heat rejection to the environment e. The COP 2. A heat pump operates on the ideal vapor-compression refrigeration cycle and uses refrigerant-134a as the working fluid. The condenser operates at 1400 kPa and the evaporator at 320 kPa. The compressor power is 25 kW.
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Unformatted text preview: a. COP b. The rate of heat supplied to the evaporator 3. Use the attached EES code to study the effect of evaporator pressure on evaporator temperature, compressor power, heat removed from refrigerated space, heat rejected to warm environment, and COP. Alter evaporator pressure from 0.1 MPa to 0.5 MPa in 0.05 MPa increments. 4. Problem 3 demonstrates that increasing compressor power improves cycle performance. What physical limitation prohibits engineers from increasing the evaporator pressure? Due Friday August 6 th , 2010 10:00AM...
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