A heat pump uses 120 kJ of electrical energy to move heat and delivers 200 kJ of heat to a room. What is the coefficient of performance (COP) of the heat pump?

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Multiple Choice

A heat pump uses 120 kJ of electrical energy to move heat and delivers 200 kJ of heat to a room. What is the coefficient of performance (COP) of the heat pump?

The key idea is that the coefficient of performance (COP) for a heat pump is the useful heat delivered to the room divided by the electrical energy put in. Here, the room receives 200 kJ of heat while the input energy is 120 kJ, so COP = 200/120 ≈ 1.67. This means about 1.67 kJ of heat are delivered for every 1 kJ of electrical energy used. Could mention that a COP greater than 1 is typical for heat pumps because they move heat rather than convert all energy to heat. With the given numbers, the COP is about 1.67, matching the option around 1.67.

The key idea is that the coefficient of performance (COP) for a heat pump is the useful heat delivered to the room divided by the electrical energy put in. Here, the room receives 200 kJ of heat while the input energy is 120 kJ, so COP = 200/120 ≈ 1.67. This means about 1.67 kJ of heat are delivered for every 1 kJ of electrical energy used. Could mention that a COP greater than 1 is typical for heat pumps because they move heat rather than convert all energy to heat. With the given numbers, the COP is about 1.67, matching the option around 1.67.

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