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misseylaLv10
10 Jul 2022
An ammonia ice plant operates between a condenser temperature of 35°C and
evaporator of -15°C. It produces 10 metric tons of ice per day from water at 30°C to ice at
-5°C. Assuming simple saturation cycle, determine the horsepower of the motor if the
adiabatic efficiency of the compressor n = 0.85 and mechanical efficiency n = 0.95. The
specific heat of ice is 2.094 kJ/kg-°C and the latent heat is 335 kJ/kg. From the table for
ammonia the following enthalpies are: condenser entrance = 1703 kJ/kg, exit = 366.1 kJ/kg;
compressor entrance = 1443.9 kJ/kg, exit = 1703 kJ/kg.
An ammonia ice plant operates between a condenser temperature of 35°C and
evaporator of -15°C. It produces 10 metric tons of ice per day from water at 30°C to ice at
-5°C. Assuming simple saturation cycle, determine the horsepower of the motor if the
adiabatic efficiency of the compressor n = 0.85 and mechanical efficiency n = 0.95. The
specific heat of ice is 2.094 kJ/kg-°C and the latent heat is 335 kJ/kg. From the table for
ammonia the following enthalpies are: condenser entrance = 1703 kJ/kg, exit = 366.1 kJ/kg;
compressor entrance = 1443.9 kJ/kg, exit = 1703 kJ/kg.
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