REFRIGERATORS AND HEAT PUMPS

Heat Pump

A refrigerator is the Cloze (1): of a heat engine

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Refrigerator is also called as heat pump

Working of a Heat Pump

Heat Engine is reversible

In a Heat Pump, the working substance extracts heat Q₂ from the Cloze (1): at temperature T₂ , some external work W is done on the Cloze (2): and heat Q₁ is released to the Cloze (3): at temperature T₁

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Heat pumps transfer heat from cold body to a hot body by the expense of mechanical energy

Completing the cycle in Heat Pump

A refrigerant is a working fluid used in the refrigeration

(a) sudden Cloze (1): of the refrigent from high to low pressure which cools it and converts it into a vapour-liquid mixture

(b) absorption by the cold fluid of heat from the region to be Cloze (2): converting it into vapour

(c) heating up of the vapour due to Cloze (3): done on the system

(d) release of heat by the vapour to the surroundings, bringing it to the initial state

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Chlorofluorocarbons are most commonly used as the refrigerant in heat pumps

Coefficient of performance ( α ) and Efficiency (η)

Question

Identify the correct statements

Answers

Option 1

By definition, efficiency can never exceed One

Option 2

Coefficient of performance ( α ) can be greater than One

Option 3

The coefficient of performance can be infinite

Option 4

In a heat engine, heat cannot be fully converted to work

Option 5

Refrigerator cannot work without some external work done on the system

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Solution

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