SpecialProblems36-38

SpecialProblems36-38 - The system operates using R-134a....

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Special Problems for ME 200 – Fall 2009 Special Problems 36, 37, and 38 Due Friday, December 4, 2009 SP36: In an ideal reheat cycle, steam enters the high-pressure turbine at 30 bar and 500 C. After expansion to 5 bar in the high-pressure turbine, the steam is reheated back to 500 C and expanded in the low-pressure turbine to condenser pressure of 0.1 bar. Saturated liquid exits the condenser. The net power output of the cycle is 100 MW. (a) Determine the thermal efficiency (%) of the cycle. (b) How much mass flow rate of steam (kg/s) is required in the cycle? (c) Calculate the rate of heat transfer (MW) in the condenser. (d) Show all the processes in the cycle on T-s diagram. SP37: Measured pressure and temperature data for a vapor-compression refrigeration system is shown on the figure below.
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Unformatted text preview: The system operates using R-134a. (a) Determine the coefficient of performance for this refrigeration system. (b) What is the isentropic efficiency (%) of the compressor? (c) Show all the processes in this refrigeration cycle on T-s diagram. SP38: An ideal vapor-compression heat pump operates between an evaporator temperature of C and condenser pressure of 9 bar. Refrigerant 134a leaves the evaporator as saturated vapor and enters the expansion valve as saturated liquid. The heat pump is used to supply 1000 kJ/min of heat to a high-temperature region. (a) What is the coefficient of performance of this heat pump cycle? (b) Determine the temperature ( C) at the exit of the compressor. (c) How much power input (kW) is required to drive the compressor?...
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