Explain the application of second law of thermodynamics to refrigerator. State any three functions of steam condenser.

Explain the application of second law of thermodynamics to refrigerator. State any three functions of steam condenser. 
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According to Clausius‘s statement “ heat cannot flow itself from cold body to a hot body without help of external agency”

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REFERIGERATOR is shown in the figure with cold body (T2) and hot body (atmosphere) (T1). A refrigerator is a device which maintains the temperature of cold body below the surrounding temp. The amount of heat taken from cold body which is to be cooled is Q2. For doing this work , external energy is required to the refrigerator. So heat rejected to atmosphere Q1= Q2 + W.

As per the statement of Statement of Second Law of Thermodynamics, it is observed that refrigerator operates between the two different temperatures in a cyclic manner. It also extracts the heat from cold body only (storage space) and does the equivalent amount of work as shown.

In a full cycle of a refrigerator, three things happen: 1. Heat is absorbed from cold body, the heat can be called Q2. 2. Some of the energy from that input heat is used to perform work (W). 3. The rest of the heat is rejected to hot body (Q1). An performance of the refrigerator can be calculated as: Efficiency = Q1 / work W So it is cleared that the external energy is required to absorb heat from cold body and to reject it to hot body. 

Function of condenser: 1) To maintain a very low back pressure so as to obtain the maximum possible energy from steam and thus secure a high efficiency. 2) To condense the steam and reuse it to supply as pure feed water to the hot well from where it is pumped back to the boiler. 3) To remove of air and non-condensable gases

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