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Unformatted text preview: Problem Set 14, PS14 due Monday June 21 6-116 Oil enters a well insulated heat exchanger at 170 C at a flow rate of 10 kg/sec and is cooled by water. The water flows at a rare of 4.5 kg/sec and is heated from 20 C to 70 C. The specific heat of the oil is 2.3 kJ/kg C. Determine a) the exit temperature of the oil and b) the rate of entropy generation in the heat exchanger. 6-153 A two stage compressor operates with an inlet temperature of 27 C and compresses .02 kg/sec of air from 100 kPa to 900kPa. The pressure ratio of the two stages are equal and both stages are isentropic. Air is cooled to the inlet temperature between stages. Determine the power required to operate the compressor. Compare the result with the compression taking place in a single stage. 6-178 Air at 100 kPa and 27 C enters the evaporator of a window air conditioner at a flow rate of 6 m 3 /min. Refrigerant R134a enters the evaporator at 120 kPa, a quality of .3 and a flow rate of 2 kg/min .The outside surfaces of the air conditioner are insulated....
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- Summer '08