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QS. An air-conditioner with a power input of 1.5 kW is working as a refrigerator (B-3) or as a heat pump (B' 4). It maintains an office at 20C year round which exchanges 0.5 kW per degree temperature difference with the atmosphere. There is a range of the outside temperatures for which this unit is sufficient a) Write the expressions that define the coefficient of performance (COP) for a refrigerator (B) and a heat pump (B) b) Calculate the maximum outside temperature the unit can work as a refrigerator/air cooler c) Calculate the minimum outside temperature the unit can work as a heat pump/heater (4 marks) (8 marks) (8 marks)
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