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TH10Set11 - Problem Set 11 PS11 due Monday June 14 PS11-1...

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Problem Set 11, PS11 due Monday June 14 4-255 Air is stored in a 10,000 ft 3 salt dome at 500 kPa and 400 K is used at times of high electric demand to drive a turbine generator. For turbine exit conditions of 100 kPa and 300 K determine the amount of work done by the turbine during the period when the salt dome pressure drops from 500 kPa to 300 kPa. Consider both the turbine and cave to be adiabatic. PS11-1 5-109 Waste heat is rejected at 80 F from a Carnot heat engine which receives 700 Btu/ min of heat at a temperature of 1700 F. A refrigerator which receives heat at 20 F and rejects heat at 80 F uses the entire output of the heat engine. Determine a) the maximum rate at which heat is absorbed by the refrigeration machine and b) the total amount of heat rejected at 80 F. PS11-2 .96 kg of R-134a is used to execute a Caront refrigeration cycle in the liquid-vapor region. The maximum absolute temperature of the cycle is 1.2 times the minimum absolute temperature. The net work input to the cycle is 22 kJ . During the heat rejection process the refrigerant changes from a saturated vapor to a saturated liquid.
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