A vapour compression-refrigerating machine is comprised of the following components connected to each other through ‘refrigerant flowing pipes’. Each component is performing different operation or process on the refrigerant. After undergoing these processes in different components, the refrigerant returns to its original state. Thus the refrigerant undergoes a cycle of processes and this cycle is called vapour compression cycle.
It is mechanical equipment run by electric motor or petrol/diesel engine. Its main function is to suck the low pressure and low temperature vapours of refrigerant coming from evaporator and compresses it to high pressure, high temperature vapours. In this way, it also pumps the refrigerant through the system.ii. Condenser.It is fitted after the compressor in the ‘refrigerant flowing line’. It is a type of heat exchanger. It is simply a bundle of pipes surrounded by any cooling medium, i.e., air or water. High pressure high temperature vapours coming from compressor flows inside the pipes of condenser and loose their latent heat to surrounding air or water through the large area of wall of pipes. On loosing heat, the high-pressure refrigerant vapours convert to high-pressure liquid.
iii. Receiver
It is simply a metallic tank fitted after the condenser. It is generally used only in large refrigeration plants where quantity of refrigerant is large. Its purpose is only to store the high-pressure refrigerant liquid coming from condenser.
iv. Expansion Device
It is fitted after the receiver and before the evaporator or evaporating coil. Its construction is such that it allows the high pressure refrigerant to flow through a narrow opening which offers resistance to flow and maintains pressure differential.Thus its function is to decrease the pressure of refrigerant liquid while flowing from receiver to evaporator and allows it to expand. Sometimes it also controls the flow.As soon as the pressure is reduced, saturation point also lowers down than the refrigeration temperature required and liquid is partially vapourized cooling the rest of liquid from condenser temperature to evaporator temperature. This low temperature liquid then enters the evaporator.
v. Evaporator/Evaporating Coil
It is again a type of heat exchanger in the shape of a bundle of pipes. It is situated in the refrigerated space. The low pressure liquid from expansion valve flows through the bundle of pipes called evaporating coil and while evaporating absorbs its latent heat from the surrounding air of refrigerated space through the wall of pipes. As the evaporating coil produce cold it is also called cooling coil.
It is mechanical equipment run by electric motor or petrol/diesel engine. Its main function is to suck the low pressure and low temperature vapours of refrigerant coming from evaporator and compresses it to high pressure, high temperature vapours. In this way, it also pumps the refrigerant through the system.ii. Condenser.It is fitted after the compressor in the ‘refrigerant flowing line’. It is a type of heat exchanger. It is simply a bundle of pipes surrounded by any cooling medium, i.e., air or water. High pressure high temperature vapours coming from compressor flows inside the pipes of condenser and loose their latent heat to surrounding air or water through the large area of wall of pipes. On loosing heat, the high-pressure refrigerant vapours convert to high-pressure liquid.
iii. Receiver
It is simply a metallic tank fitted after the condenser. It is generally used only in large refrigeration plants where quantity of refrigerant is large. Its purpose is only to store the high-pressure refrigerant liquid coming from condenser.
iv. Expansion Device
It is fitted after the receiver and before the evaporator or evaporating coil. Its construction is such that it allows the high pressure refrigerant to flow through a narrow opening which offers resistance to flow and maintains pressure differential.Thus its function is to decrease the pressure of refrigerant liquid while flowing from receiver to evaporator and allows it to expand. Sometimes it also controls the flow.As soon as the pressure is reduced, saturation point also lowers down than the refrigeration temperature required and liquid is partially vapourized cooling the rest of liquid from condenser temperature to evaporator temperature. This low temperature liquid then enters the evaporator.
v. Evaporator/Evaporating Coil
It is again a type of heat exchanger in the shape of a bundle of pipes. It is situated in the refrigerated space. The low pressure liquid from expansion valve flows through the bundle of pipes called evaporating coil and while evaporating absorbs its latent heat from the surrounding air of refrigerated space through the wall of pipes. As the evaporating coil produce cold it is also called cooling coil.
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