A water cooler using refrigerant R-134a works on condensing and evaporating temperatures of 26 C and...
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A water cooler using refrigerant R-134a works on condensing and evaporating temperatures of 26 °C and
2 °C respectively. The refrigerant leaves the evaporator as wet vapor and is only dry at the end of the
isentropic compression and there is no undercooling in the condenser. The average output of cold water
is 100 kg/h cooled from 26 "C and 6 °C. If the efficiency of the water cooler is 20% of the heat removed
from the refrigerated space while the mechanical efficiency of the compressor and the electrical motor
are 85% and 90% respectively. Take the C, of water as 4.187 kJ/kg.K.
a) Draw the T-s and p-h diagram of the cycle refrigeration cycle.
b) The quality of the refrigerant vapor at the exit of the evaporator and all the enthalpy values,
c) The mass flow rate of the refrigerant,
d) The coefficient of performance (COP) of the refrigerator, and
e) The power rating of the motor required to drive the compressor.