Answered: A heat engine is operating on a Carnot…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. A commercial refrigerator with refrigerant-134a as the working fluid is used to keep the refrigerated space at -30°C by rejecting its waste heat to cooling water that enters the condenser at 18°C at a rate of 0.28 kg/s and leaves at 26°C. The refrigerant enters the condenser at 1.2 MPa and 65°C and leaves at 42°C. The inlet state of the compressor is 60 kPa and -34°C and the compressor is estimated to gain a net heat of 420 W from the surroundings. The heat exchanger loses no heat to the environment. 26°C 42°C Condenser Expansion valve Evaporator OL Water 18°C 1.2 MPa 65°C Oin W in Compressor 60 kPa -34°C Determine the COP of the refrigerator. (You must provide an answer before moving on to the next part.) The COP of the refrigerator is 1.824 >
NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. A commercial refrigerator with refrigerant-134a as the working fluid is used to keep the refrigerated space at -30°C by rejecting its waste heat to cooling water that enters the condenser at 18°C at a rate of 0.28 kg/s and leaves at 26°C. The refrigerant enters the condenser at 1.2 MPa and 65°C and leaves at 42°C. The inlet state of the compressor is 60 kPa and -34°C and the compressor is estimated to gain a net heat of 420 W from the surroundings. The heat exchanger loses no heat to the environment. 26°C 42°C ↑ 4 Condenser Expansion valve Evaporator QL Water 18°C 1.2 MPa 65°C ↑gin Win Compressor 60 kPa -34°C Determine the theoretical maximum refrigeration load for the same power input to the compressor. The theoretical maximum refrigeration load for the same power input to the compressor is KW.
NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. A commercial refrigerator with refrigerant-134a as the working fluid is used to keep the refrigerated space at -30°C by rejecting its waste heat to cooling water that enters the condenser at 18°C at a rate of 0.28 kg/s and leaves at 26°C. The refrigerant enters the condenser at 1.2 MPa and 65°C and leaves at 42°C. The inlet state of the compressor is 60 kPa and -34°C and the compressor is estimated to gain a net heat of 420 W from the surroundings. The heat exchanger loses no heat to the environment. 26°C 42°C Expansion valve 4 Condenser ↓ Evaporator Water 18°C QL 1.2 MPa 65°C Qin W in Compressor 60 kPa -34°C Determine the quality of the refrigerant at the evaporator inlet. (Take the required values from saturated refrigerant-134a tables.) (You must provide an answer before moving on to the next part.) The quality of the refrigerant at the evaporator inlet is

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A heat engine is operating on a Carnot cycle and has a thermal efficiency of 59.41 percent. The waste heat from this engine is rejected to a nearby lake at 62.67 F at a rate of 809.32 Btu/min. Determine the temperature (R) of the source. (Use 2 decimal places for the final answer.)