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pressor at 400 kPa as a saturated vapor at a rate of 80 L/min COP, (b) the maximum COP, and (c) the minimum volume and leaves at 1200 kPa and 70°C. Determine (a) the actual and lights amounts to 900 W. The refrigerant enters the com- gains heat through the walls and the windows at a rate of 250 kJ/min while the heat generated by the computer, TV, ing the waste heat to the outdoor air at 34°C. The room working fluid is used to keep a room at 23°C by reject- 6-108 An air-conditioner with refrigerant-134a as the flow rate of the refrigerant at the compressor inlet for same compressor inlet and exit conditions. Answers. a he (b) 26.9, (c) 12.9 L/min 1.2 MPa 70°C Condenser Expansion valve Compressor 400 kPa Evaporator sat. vapor

pressor at 400 kPa as a saturated vapor at a rate of 80 L/min COP, (b) the maximum COP, and (c) the minimum volume and leaves at 1200 kPa and 70°C. Determine (a) the actual and lights amounts to 900 W. The refrigerant enters the com- gains heat through the walls and the windows at a rate of 250 kJ/min while the heat generated by the computer, TV, ing the waste heat to the outdoor air at 34°C. The room working fluid is used to keep a room at 23°C by reject- 6-108 An air-conditioner with refrigerant-134a as the flow rate of the refrigerant at the compressor inlet for same compressor inlet and exit conditions. Answers. a he (b) 26.9, (c) 12.9 L/min 1.2 MPa 70°C Condenser Expansion valve Compressor 400 kPa Evaporator sat. vapor

Elements Of Electromagnetics
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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**Problem 6-108** An air-conditioner with refrigerant-134a as the working fluid is used to keep a room at 23°C by rejecting the waste heat to the outdoor air at 34°C. The room gains heat through the walls and the windows at a rate of 250 kJ/min while the heat generated by the computer, TV, and lights amounts to 900 W. The refrigerant enters the compressor at 400 kPa as a saturated vapor at a rate of 80 L/min and leaves at 1200 kPa and 70°C. Determine (a) the actual COP, (b) the maximum COP, and (c) the minimum volume flow rate of the refrigerant at the compressor inlet for the same compressor inlet and exit conditions. **Answers:** (a) 4.33, (b) 26.9, (c) 12.9 L/min **Diagram Explanation** The diagram illustrates a refrigeration cycle with the following components: 1. **Compressor**: The refrigerant enters as a saturated vapor at 400 kPa and exits at 1.2 MPa and 70°C. The compressor requires work input (\( W_{\text{in}} \)). 2. **Condenser**: The refrigerant releases heat (\( \dot{Q}_H \)) to the surroundings. 3. **Expansion Valve**: This is where the pressure drops as the refrigerant enters the evaporator. 4. **Evaporator**: The refrigerant absorbs heat (\( \dot{Q}_L \)) from the indoor air, providing the cooling effect. Arrows in the diagram indicate the flow direction of the refrigerant, and heat exchange points are marked accordingly.
Transcribed Image Text:**Problem 6-108** An air-conditioner with refrigerant-134a as the working fluid is used to keep a room at 23°C by rejecting the waste heat to the outdoor air at 34°C. The room gains heat through the walls and the windows at a rate of 250 kJ/min while the heat generated by the computer, TV, and lights amounts to 900 W. The refrigerant enters the compressor at 400 kPa as a saturated vapor at a rate of 80 L/min and leaves at 1200 kPa and 70°C. Determine (a) the actual COP, (b) the maximum COP, and (c) the minimum volume flow rate of the refrigerant at the compressor inlet for the same compressor inlet and exit conditions. **Answers:** (a) 4.33, (b) 26.9, (c) 12.9 L/min **Diagram Explanation** The diagram illustrates a refrigeration cycle with the following components: 1. **Compressor**: The refrigerant enters as a saturated vapor at 400 kPa and exits at 1.2 MPa and 70°C. The compressor requires work input (\( W_{\text{in}} \)). 2. **Condenser**: The refrigerant releases heat (\( \dot{Q}_H \)) to the surroundings. 3. **Expansion Valve**: This is where the pressure drops as the refrigerant enters the evaporator. 4. **Evaporator**: The refrigerant absorbs heat (\( \dot{Q}_L \)) from the indoor air, providing the cooling effect. Arrows in the diagram indicate the flow direction of the refrigerant, and heat exchange points are marked accordingly.
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