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walk-in cooler throttling device
walk-in cooler throttling device
throttling device, also known as expansion mechanism, is installed after the walk-in cooler condenser, and the high pressure refrigerant liquid from the condenser flows through the throttling device. Lower and then enter the evaporator. The throttling device of the refrigeration device not only realizes the refrigerant liquid throttling process, but also has the following two functions: one is to separate the high-pressure part and the low-pressure part of the refrigerating machine, and to prevent gas from flowing between the high and low pressures; It is to control the liquid supply of the evaporator to keep an appropriate amount of liquid in it, so that the heat exchange area of the evaporator is fully functional. Because the throttling device has no external power output, that is, the concept of inefficiency, it is generally only based on the above two functions to judge its characteristics. Through the adjustment of the throttling device, the refrigerant has a certain degree of superheat when it leaves the evaporator, thereby ensuring that the refrigerant liquid does not enter the compressor. When the fluid flows through the throttling device, because the time is very short, it can be regarded as an adiabatic process. After throttling, the liquid becomes a gas-liquid two-phase, in which the content of vapor accounts for 10% to 30% of the total refrigerant mass flow. The vapor produced by liquid throttling is saturated vapor, also known as flash vapor, to distinguish it from saturated vapor produced by liquid during endothermic phase change. There are many types of throttling devices, which can be divided into the following five types according to the liquid supply adjustment method of the throttling mechanism: manual expansion valve, float control valve, thermal expansion valve, electronic expansion valve and capillary tube. The first two of these five types have been gradually eliminated due to the difficulty in achieving automatic control. Capillary tubes are generally used in small walk-in coolers, but a new type of throttling short tube is gradually replacing capillary tubes and is beginning to be used in walk-in coolers around 40kW. The throttling element and other controllers form a flow regulation system, which will be described in detail in the subsequent control section.
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