The refrigeration cycle is made up of 5 main components which will be explained in this essay. There are many different factors that allow refrigeration to work. We will also look at the basic principles of refrigeration, how the refrigeration cycle works, and types of heat transfer. First, I'll discuss exactly what happens on the low pressure and low temperature side of the refrigeration system. The refrigerant flows through the expansion valve which regulates the flow of refrigerant between the high and low sides. The cold, low-pressure liquid then goes to the evaporator where the heat from the internal air is absorbed and turns the liquid into a gas. The hot, low-pressure gas then moves to the compressor where it is then compressed into a hot, high-pressure gas. Next, the refrigerant moves to the next side of the refrigeration cycle, which is the high-pressure side. The refrigerant leaves the compressor as a high-temperature, high-pressure gas and then moves to the condenser. In the condenser the hot gas is condensed back to the liquid state and its heat is released to the outside air. The refrigerant then moves from the condenser to the expansion valve where the amount of flow is limited and lowers the pressure as the refrigerant leaves the expansion valve. There are three different ways heat can be transferred, namely conduction, convection and radiation. Radiation is heat transfer that involves the absorption of heat, such as the sun producing heat and the Earth absorbing heat. The second is conduction, which is the process of transferring heat through metal. an example of this would be heating one end of a metal pipe and the other end of the pipe will start to get hotter. Finally there is convection, which is the transfer of heat… to the center of the paper… heat. The tube within the tube is constructed by placing a tube inside a second tube. The shell and tube condenser uses cold water in the tubes and feeds the hot refrigerant and condenses the refrigerant when it comes into contact with the tubes. The evaporative condenser uses open spray or poured water to cool a condenser. The metering device of a refrigeration unit regulates the flow of refrigerant to the evaporator and divides the high-pressure side from the low-pressure side of the system. The capillary tube is usually made of a predetermined length of tube having a small internal diameter. A thermostatic expansion valve doses the refrigerant based on different temperatures and pressures. The type that works in response to evaporator pressure is called an automatic expansion valve. Refrigerant lines transport refrigerant liquid and vapor between system components.