Q2: A refrigerator with refrigerant-134a as the working fluid is used to maintain a space at...

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Q2: A refrigerator with refrigerant-134a as the working fluid is used to maintain a space at 15C by rejecting heat to ambient air at 20C. R-134a enters the compressor at 100 kPa and -20C and leaves at 40C. The refrigerant leaves the condenser at 800 kPa as a saturated liquid. The heating load (QH) is 9.05 kW. No pressure drops occur inside the condenser and the evaporator (i.e., P2 = P3 and P = P4). Determine: 1. the mass flow rate (m). 2. The cooling rate (QL). 3. The COP of the system. 4. The COP max of the system. Note: TL-15C and TH = 20C 3 Condensor Throttling valve Compressor Evaporator Figure 1: Schematic diagram of problem 2 2 Q2: A refrigerator with refrigerant-134a as the working fluid is used to maintain a space at 15C by rejecting heat to ambient air at 20C. R-134a enters the compressor at 100 kPa and -20C and leaves at 40C. The refrigerant leaves the condenser at 800 kPa as a saturated liquid. The heating load (QH) is 9.05 kW. No pressure drops occur inside the condenser and the evaporator (i.e., P2 = P3 and P = P4). Determine: 1. the mass flow rate (m). 2. The cooling rate (QL). 3. The COP of the system. 4. The COP max of the system. Note: TL-15C and TH = 20C 3 Condensor Throttling valve Compressor Evaporator Figure 1: Schematic diagram of problem 2 2