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In an air conditioner, Refrigerant R 22 enters an expansion valve at 20 bar and saturated liquid, and leaves at 2.5 bar. The refrigerant undergoes a throttling process in the expansion valve. After leaving the valve, the refrigerant is in a saturated vapor state. The mass flow rate through both devices is 0.05 kg/s. You can assume that there is no pressure drop in the evaporator and that kinetic energy changes are negligible.The following information is required:a) Schematic and sketch of the entire process on a T v diagram.b) Set of assumptions to analyze the problem.c) The temperatures T1 and T2 of the refrigerant at all states, in °C.d) The quality x of the refrigerant at the exit of the expansion valve.e) The heat transfer Qevap, in kW, in the evaporator.f) Comment on the sign of the heat transfer and why this device functions as a chiller for the surroundings. Justify your answer.
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| Question Text | In an air conditioner, Refrigerant R 22 enters an expansion valve at 20 bar and saturated liquid, and leaves at 2.5 bar. The refrigerant undergoes a throttling process in the expansion valve. After leaving the valve, the refrigerant is in a saturated vapor state. The mass flow rate through both devices is 0.05 kg/s. You can assume that there is no pressure drop in the evaporator and that kinetic energy changes are negligible.The following information is required:a) Schematic and sketch of the entire process on a T v diagram.b) Set of assumptions to analyze the problem.c) The temperatures T1 and T2 of the refrigerant at all states, in °C.d) The quality x of the refrigerant at the exit of the expansion valve.e) The heat transfer Qevap, in kW, in the evaporator.f) Comment on the sign of the heat transfer and why this device functions as a chiller for the surroundings. Justify your answer. |
| Updated On | Feb 11, 2025 |
| Topic | All Topics |
| Subject | Physics |
| Class | Class 12 |
