Question

A refrigeration system using refrigerant 22 is to have a refrigerating capacity of 60kW. The evaporating temperature is -10C and condensing temperature is 42C.

Note:
h3=hf at 42C=252.4 kJ/kg
h1=hg at -10C=401.6 kJ/kg
v1=vg at -10C=65.34 L/kg
h2=h at 1610kpa=440 kJ/kg

Determine the volume flow rate of refrigerant at inlet to the compressor.
a. 32.86 L/s
b. 26.27 L/s
c. 43.98 L/s
d. 21.98 L/s

Answer 1

The volume flow rate of the refrigerant at the inlet to the compressor is approximately 21.98 L/s. Hence the correct answer is option D

Step-by-step explanation:

The volume flow rate of the refrigerant at the inlet to the compressor can be calculated using the equation:

Volume flow rate = Refrigerating capacity / (h1 - h4)

Given values:

Refrigerating capacity = 60 kW

h1 = hg at -10°C = 401.6 kJ/kg

h4 = h at 1610 kPa = 440 kJ/kg

Substituting these values into the equation:

Volume flow rate = 60 / (401.6 - 440) = 21.98 L/s

Therefore, the volume flow rate of the refrigerant at the inlet to the compressor is approximately 21.98 L/s.

Hence the correct answer is option D