Consider a two-stage cascade refrigeration system operating between the pressure limits of 1.6 MPa and 140 kPa with refrigerant-134a as the working fluid. Heat rejection from the lower cycle to the upper cycle takes place in an adiabatic counterflow heat exchanger where the pressure in the upper and lower cycles are 0.4 and 0.6 MPa, respectively. In both cycles, the refrigerant is a saturated liquid at the condenser exit and a saturated vapour at the compressor inlet, If the mass flow rate of the refrigerant through the lower cycle is 0.4 kg/s, determine the COP of this refrigerator.
USE THE REFRIGERANT TABLE
MODULE :
QUESTION 4
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Consider a two-stage cascade refrigeration system operating between the pressure limits of 1.6 MPa and 140 kPa with refrigerant-134a as the working fluid. Heat rejection from the lower cycle to the upper cycle takes place in an adiabatic counterflow heat exchanger where the pressure in the upper and lower cycles are 0.4 and 0.6 MPa, respectively. In both cycles, the refrigerant is a saturated liquid at the condenser exit and a saturated vapour at the compressor inlet, If the mass flow rate of the refrigerant through the lower cycle is 0.4 kg/s, determine the COP of this refrigerator.
NOTE: Your answer should be in 2 decimal places and do not include SI units in your answer when puting it in the answer box
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