The liquid refrigerant coming out from condenser through expansion valve is passed through coiled tube and gets evaporated and the vapor thus formed in evaporator is sucked by the compressor. The motor and compressor both are separate units and are coupled with a common shaft for power transmission. Between points 4 and 5, the saturated liquid refrigerant passes through the expansion valve and undergoes an abrupt decrease of pressure. As air comes in contact with the condenser tubes, it picks up heat from the refrigerant and thus the temperature of air increases. (b) It must regulate the flow of refrigerant to the evaporator. It has a smaller size for the given capacity of refrigeration. The Vapor Compression Refrigeration Cycle. The heat energy required to change the liquid refrigerant into gas is obtained from air or water surrounding evaporator coil. A small diameter tube can offer the same restrictive effect as the small orifice produces. [10, 11] But practically a refrigeration system has to work under transient conditions. The condensation process occurs at essentially constant pressure. Multi-Stage: In the case of a Refrigeration system very low-pressure refrigerant vapors (Evaporator pressure) are to be compressed to very high-pressure refrigerant vapors (Condenser pressure). The other end of the feeler bulb is connected with the expansion valve through a small capillary tube. Function Of This valve is to Supply a proper amount of refrigerant to the evaporator after reducing its, pressure considerably so that the refrigerant may take sufficient amount of heat from the. The figure shows the basic components of a vapor compression refrigeration system. For small capacity plant, capillary tube is used as an expansion device. Before uploading and sharing your knowledge on this site, please read the following pages: 1. Introduction to Slotting Machine : Vapor compression refrigeration system consists of the following important components: 1. The valve actually creates a pressure difference between condenser pressure and evaporator pressure. Thus, the evaporator coils are always dry. Compressors are classified into three major types: The compressor in which vapor refrigerant is compressed by the reciprocating (back and forth) motion of the piston in a cylinder is known as reciprocating compressor. An expansion valve is a component in refrigeration and air conditioning systems that controls the amount of refrigerant flow into the evaporator thereby controlling the superheat at the outlet of the evaporator. In a vapour compression refrigeration unit, the refrigerant undergoes phase changes which is one of the many refrigeration cycles and is the most widely used method for air-conditioning of buildings and auto mobiles. Due to frictional resistance offered by a small diameter tube, the pressure drops down to evaporator pressure. 1. Components of Vapour Compression Refrigeration System: The figure above consists of the following five essential parts, those are: Compressor; Condenser; Receiver; Expansion Valve; Evaporator The system in which a liquid refrigerant gets evaporated inside the evaporator cooling coil and the fluid to be cooled is passed over the surface of cooling coil is known as direct expansion system (Fig. While passing through the compressor, the heat-laden gas is raised from low to high pressure, thereby raising its temperature. Function Of This valve is to Supply a proper amount of refrigerant to the evaporator after reducing its pressure considerably so that the refrigerant may take sufficient amount of heat from the refrigerating space during evaporation. If the receiver is not used in small capacity plant, the expansion valve is placed in between condenser and evaporator directly. Refrigeration has been accomplished in a variety of ways over the course of history, but vapor-compression refrigeration systems (VCRS) have become the preferred option thanks to their efficiency and reliability. The function of automatic expansion valve is similar to thermostatic expansion valve. Through there are many cycles, yet the following are important from the subject point of view: 1. In a large air conditioning system, water or brine is chilled in an evaporator and the chilled fluid is circulated through a copper or steel tube. There are three main types of expansion devices: A small diameter tube of certain length is called capillary tube. to raise the pressure of the refrigerant and provide the primary force to circulate the refrigerant. Such a system is called indirect system. Figures 6.3(a) and 6.3(b) show a single-stage single-acting reciprocating open-type compressor in the simplest form. refrigerated space into the vaporizing refrigerant. The Capacity of a Compressor is determined by its Mass Flow rate (Lb/Min) and not by Volume Flow(CFM). A refrigeration system can also be used as a heat pump, in which the useful output is the high-temperature heat rejected at the condenser. Refrigeration The components of a vapour-compression refrigeration cycle: a compressor, condenser, expansion valve, and evaporator. It is very much suitable for dry type of evaporator. It also maintains a continuous flow of the refrigerant through the system. The figure shows the basic components of a vapor compression refrigeration system. The high-pressure liquid refrigerant is again returned to be admitted through the expansion valve to the evaporator, and the vaporization takes place at low pressure. The air- cooled condenser is suitable for small-capacity plants such as domestic fridge, window air conditioner. Account Disable 12. This is … The wires act as fins to enhance heat transfer rate. The vapor compression refrigeration system is nowadays used for all purposes. Working principle of Vapour Compression Cycle. An expansion valve which is also known as throttle valve is a device to reduce the pressure and temperature of the liquid refrigerant before it is supplied to the evaporator where refrigerant gets evaporated. Condenser 3. Cycle with wet vapor after compression. Volumetric efficiency of compressor increases, 4. From the receiver it passes through an expansion valve where the pressure is reduced sufficiently to allow the vaporization of liquid at a low temperature of about -10°C.Â. Save my name and email in this browser for the next time I comment. Water is continuously supplied through the shell and chilled water comes out at the other end of the shell. All the important details are covered here. Hence, the condensing temperature will be higher in an air-cooled condenser than that in a water-cooled condenser. 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