Common data for Question 01 & 02
A refrigerator based on ideal vapour compression cycle operates between the temperature limits of –200C and 400C. The refrigerant enters the condenser as saturated vapour and leaves as saturated liquid. The enthalpy and entropy vapour At these temperatures are given in the table below.
|
Temp (0C)
|
$h_{f}$
(kJ/kg)
|
$h_{g}$
(kJ/Kg)
|
$s_{f}$
(kJ/kg)
|
$s_{g}$
(kJ/kg K)
|
|
-20
|
20
|
180
|
0.07
|
0.7366
|
|
40
|
80
|
200
|
0.3
|
0.67
|
- If refrigerant circulation rate is 0.025 kg/s, the refrigeration effect is equal to
(a) 2.1 kW (b) 2.5 kW
(c) 3.0 kW (d) 4.0 kW
2. The COP of the refrigerator is
(a) 2.0 (b) 2.33
(c) 5.0 (d) 6.0