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The refrigerator

# The refrigerator - The refrigerator A refrigerator is a...

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The refrigerator A refrigerator is a device that causes heat to flow from a cold place to a warm place. Another formulation of the second law of thermodynamics states that " It is not possible for heat to flow from one body to another body at a higher temperature with no other change taking place " The performance of a refrigerator is specified by the coefficient of performance K 19.4. The Carnot Cycle An example of a series of processes which would create a reversible engine is the carnot cycle. One full cycle consists of two isothermal and two adiabatic processes. The initial situation is specified by a volume V a , a pressure p a , and a temperature T a . The gas is confined in a cylinder by a piston which has weight on top. Step 1 : the system is in contact with a high temperature reservoir. Thus, T a = T H . Part of the weight of the piston is removed. As a result the gas will expand; its volume will increase from V a to V b and its pressure will decrease. During this process a total heat equal to Q H is extracted from the reservoir. Since the temperature of the gas is kept constant at T

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The refrigerator - The refrigerator A refrigerator is a...

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