Vapour Compression Cycle

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ACKNOWLEDGEMENT

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Many people have provided direction, technical information, advice at …show more content…

Vapor-compression refrigeration
2. Vapor-absorption refrigeration

1.1.1 Vapour Compression Cycle:

The thermodynamics of the cycle can be analyzed on a diagram as shown. In this cycle, a circulating refrigerant such as Freon enters the compressor as a vapor.
From point 1 to point 2, the vapor is compressed at constant entropy and exits the compressor as a vapor at a higher temperature, but still below the vapor pressure at that temperature.
From point 2 to point 3 and on to point 4, the vapor travels through the condenser which cools the vapor until it starts condensing, and then condenses the vapor into a liquid by removing additional heat at constant pressure and temperature.
Between points 4 and 5, the liquid refrigerant goes through the expansion valve (also called a throttle valve) where its pressure abruptly decreases, causing flash evaporation and auto-refrigeration of, typically, less than half of the liquid.

Figure-1.1 Vapor Compression Cycle

That results in a mixture of liquid and vapor at a lower temperature and pressure as shown at point 5.
The cold liquid-vapor mixture then travels through the evaporator coil or tubes and is completely vaporized by cooling the warm air (from the space being refrigerated) being blown by a fan across the evaporator coil or …show more content…

They produce their cooling effect via the "Reverse-Rankine" cycle, also known as 'vapor-compression'.

1.1.4 Design Formulation:
Flow and Capacity Calculations
1. For air conditioning applications, the common design conditions are 44oF supply water temperature and 2.4 gpm/ton. The temperature change in the fluid for either the condenser or the evaporator can be described using the following formula:
Q = W × C × ΔT .... 1
Where
Q = Quantity of heat exchanged (Btu/hr)
W = flow rate of fluid (USgpm)
C = specific heat of fluid (Btu/lb- oF)
ΔT = temperature change of fluid (oF )
2. Assuming the fluid is water, the formula takes the more common form of:
Load (Btu/hr) = Flow (USgpm) × (oFin - oFoutt) × 500 …. 2
Or
Load (tons) = Flow (USgpm) × (oFin - oFout)/24

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