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Question 5 (15 marks) Consider a two-stage cascade refrigeration system operating between the pressure limits of 100 kPa and 1 MPa with refrigerant-134a as the working fluid. Heat rejection from the lower cycle to the upper cycle takes place in an adiabatic heat exchanger where the pressure in the lower and upper cycles are 0.4 and 0.5 MPa, respectively. In both cycles, the refrigerant is a saturated liquid at the condenser exit and a saturated vapor at the compressor inlet. If the mass flow rate of the refrigerant through the lower cycle uoen (mb) is 0.1 kg/s a. fill in the blank spaces, 4 marks State b. sketch the cycle on P-h diagram c. the mass flow rate of the refrigerant through the upper cycle d. the coefficient of performance e. the second law efficiency of the cycle. 2 marks 3 marks 3 marks 3 marks Hint: use saturation temperatures in the evaporator and condenser as T, and Th

thermodynamics

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