Air conditioners operate on the same principle as refrigerators.Consider an air

Question

Air conditioners operate on the same principle as refrigerators.Consider an air conditioner that has 7.00 kg of refrigerant flowing through its circuiteach cycle. The refrigerant enters the evaporator coils in phaseequilibrium, with 54.0 % of its mass as liquid and the rest asvapor. It flows through the evaporator at a constant pressure andwhen it reaches the compressor 95% of its mass is vapor. In each cycle, howmuch heat Qc is absorbed by the refrigerant while itis in the evaporator? The heat of vaporization of the refrigerantis 1.50105 J/kg..

Explanation / Answer

Mass of liquid entering evaporator = 7 * .54 = 3.78 kg Mass of liquid entering compressor = 7 * .05 = .35 kg Mass of liquid evaporated = 3.78 - .35 = 3.43 kg Heat required to evaporate Qc = 3.43 * 1.5 * 10E5 =5.14 * 10E5 J

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