Question

Consider a two-stage cascade refrigeration system working between the pressure limits of 1.2 MPa and 200 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 MPa and 0.5 MPa, respectively. In both cycles, the refrigerant is saturated liquid at the condenser exit and a saturated vapor at the compressor inlet, and the isentropic efficiency of the compressor is 80 %. If the mass flow rate of the refrigerant through the lower cycle is 0.25 kg/s, Evaluate (a) the mass flow rate of the refrigerant through the upper cycle Blank 1. Calculate the answer by read surrounding text. kg/s, (b) the rate of heat removal from the refrigerated space Blank 2. Calculate the answer by read surrounding text. kW & power input to a cascade cycle Blank 3. Calculate the answer by read surrounding text. kW, and (c) the COP of this refrigerator Blank 4. Calcul

Answer 1

Answer:

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Answer 2

Answer:

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