217. 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 nc = 0.85 and mechanical efficiency nm = 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.

A. 17.68 hp B. 18.61 hp C. 15.5 hp D. 21.9 hp