What is the purpose of suction and makeup air in a centrifugal compressor when it is used as a refrigeration unit?
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I have never worked on a refrigeration unit before; a compressor simply has an inlet and an outlet. But in a refrigeration unit, there is also a process of evacuating air and filling it with air – what is the purpose of this?
I don’t know what your refrigerator looks like, but the general working principle is that the refrigerant (a liquid used for cooling) turns from liquid to gas in the evaporator; the evaporator releases cold energy (cooling the gas or liquid for use). The gasified refrigerant then enters the compressor where it is pressurized, raising the temperature at which it can be liquefied again. The compressed cold gas is sent to the condenser, where it is turned into a liquid using normal-temperature water. Under pressure, it passes through a filter, a dryer, and a throttle valve before reaching the evaporator. It circulates in order to cool the gas or supply liquid to the user. Home air conditioners all work on the same principle. It’s just outdoor air cooling with cold air indoors. I’m not sure if this is what needs to be explained; it’s just for reference.
The vaporization of that liquid requires heat absorption. At the vapor-liquid equilibrium point, continuous extraction of vapor leads to more refrigerant vaporization, which in turn absorbs more heat; therefore, it is necessary to replenish the liquid. The compressed gas then turns back into liquid under the action of the condenser, and this cycle repeats to achieve cooling