A food storage chamber requires a refrigeration system of


A food storage chamber requires a refrigeration system of 15-ton capacity operating at an evaporator temperature of -8°C and a condenser temperature of 30°C. Refrigerant ammonia (R-717) is used and the system operates at saturated conditions. Determine:

(a) C.O.P.

(b) Refrigerant flow rate

(c) Rate of heat removed by the condenser.

Repeat problem, with the refrigerant subcooled by 5°C before entering the expansion valve, and the vapor superheated by 6°C.

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