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4. Explain briefly the principle of a heat pump. What is meant by coefficientof performance?

4. Explain briefly the principle of a heat pump. What is meant by coefficientof performance?

Grade:11

1 Answers

Arun
25750 Points
6 years ago
A low temperature waste heat flow can be upgraded to useful high temperature heat with the use of a heat pump. Among the different types of heat pumps that have been developed, the mechanical heat pump is the most widely used. Its operating principle is based on compression and expansion of a working fluid, or so called `refrigerant`. A heat pump has four main components: evaporator, compressor, condenser and expansion device. The refrigerant is the working fluid that passes through all these components. In the evaporator heat is extracted from a waste heat source. In the condenser this heat is delivered to the consumer at a higher temperature level. Electric energy is required to drive the compressor and this energy is added to the heat that is available in the condenser. The efficiency of the heat pump is denoted by its COP (coefficient of performance), defined as the ratio of total heat delivered by the heat pump to the amount of electricity needed to drive the heat pump.

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