Question

A commercial refrigerator with refrigerant -134a as the working fluid is used to keep the refrigerated space at -30C by rejecting its waste heat to cooling water that enters the condenser at 18C at a rate of 0.25 kg/s and leaves at 26C. The refrigerant enters the condenser at 1.2 MPa and 65C and leaves at 42C. The inlet state of the compressor is 60 kPa and -34C and the compressor is estimated to gain a net heat of 450 W from the surroundings. Determine
a. the quality of the refrigerant at the evaporator inlet,



b.the refrigeration load,



c. the COP of the refrigerator, and



d. the theoretical maximum refrigeration load for the same power input to the compressor.

Answer 1

Answer:

a. the quality of the refrigerant at the evaporator inlet, x = 0.487

b.the refrigeration load, 5.46 kw

c. the COP of the refrigerator, 2.24

d. maximum refrigeration load 12.43 kw

Explanation:

Answer 2

Answer:

a) 0.487

b) refrigeration load = 5.46w

c) cop = 2.24

d)ref load max = 12.43kw

Explanation:

Answer 3

A commercial refrigerator with refrigerant-134a as the working fluid is used to
keep the refrigerated space at -30°C by rejecting its waste heat to cooling water
that enters the condenser at 18°C at a rate of 0.25 kg/s and leaves at 26°C. The
refrigerant enters the condenser at 1.2 MPa and 65°C and leaves at 42°C.
The inlet state of the compressor is 60 kPa and -34°C and the compressor is
estimated to gain a net heat of 450 W from the surroundings. Determine (a) the
quality of the refrigerant at the evaporator inlet, (b) the refrigeration load, (c) the
COP of the refrigerator, and (d) the theoretical maximum refrigeration load for the
same power input to the compressor.