Afood department is kept at 2128c by a refrigerator in an environment at 308c. the total heat gain to the food department is estimated to be 3300 kj/h and the heat rejection in the condenser is 4800 kj/h. determine the power input to the compressor, in kw and the cop of the refrigerator.

2.2

Explanation:

= Heat rejection in the condenser = 3300 kJ/h

= Heat gain to the food department = 4800 kJ/h

Power output is given by

COP of a refrigerator is given by

The COP of the refrigerator is 2.2

find the surface area of the sphere to the nearest square unit. use a calculator.

a. 254 in.2

b. 64 in.2

c. 127 in.2

d. 1,018 in.2