Answer Happy

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Р II. Refrigerators and Air-Conditioners 1. For any closed system that operates in a cyclic process we have learned that the change in internal energy of the gas will be zero, (AU = 0). Thus, if we apply the first law of thermodynamics AU = Q - W we can determine that the net amount of work done on the gas will remove heat from the gas. This input of mechanical energy will allow heat to be V removed from "colder" objects and rejected to "warmer" objects. Show the direction of the energy flow on the diagram below indicating the value QH, Qc and W for a typically cooling device. List the equation used to relate these three energies as well as the equation for the thermal COP of cooling devices. Hot Reservoir tQui Work = QH- Qc o Ť Qc Thermal COP = Cold Reservoir QHT Qc -W ő l3 Question: What does the term "thermal C.O.P." stand for? Can this value be greater than 1.0? Does the term COP have any units? Question: How do you rewrite the equation for the COP of the refrigerator/air-conditioner if it operates on the Carnot cycle? Question: Many refrigerators and air-conditioners are rated in value called an E.E.R. (energy efficiency ratio.) What is different about this term compared to the C.O.P. of these devices? (Are there specific units for measuring the EER of a device?)