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在冷庫制冷系統中，蒸發器、冷凝器、冷庫壓縮機和節流閥，是制冷系統中必不可少的四大件，這當中蒸發器是輸送冷量的設備，制冷劑在蒸發器中吸收被冷卻物體的熱量實現制冷。

In the cold storage refrigeration system, evaporators, condensers, refrigerators and throttle valves are four essential parts of refrigeration system. Evaporators are devices that transmit cold quantities. Refrigerants absorb heat from cooled objects to achieve refrigeration in evaporators.

在冷庫內，按照制冷原理將制冷壓縮機、制冷設備、閥門及控制器等用無縫鋼管連接成完整的制冷裝置，形成一個封閉系統。在制冷壓縮機的作用下，使制冷劑在系統內發生相變(蒸發吸熱)而不斷循環，以冷間及食品溫度達到制冷的目的。而這個系統就是冷庫的制冷系統。

In the cold storage, according to the refrigeration principle, the refrigeration compressor, refrigeration equipment, valves and controllers are connected into seamless refrigerating devices by seamless steel tubes, forming a closed system. Under the action of refrigeration compressor, the refrigerant will undergo phase change (evaporation and heat absorption) in the system, and it will circulate continuously, so that the cooling room and food temperature will achieve the purpose of refrigeration. And this system is the refrigeration system of the cold storage.

節流閥對制冷劑起節流降壓作用、同時控制和調節流入蒸發器中制冷劑液體的數量，并將系統分為高壓側和低壓側兩大部分。

The throttle valve throttled and throttled the refrigerant, controlled and regulated the amount of refrigerant liquid flowing into the evaporator, and divided the system into two parts: the high side and the low side.

冷凝器是放出熱量的設備，將蒸發器中吸收的熱量連同壓縮機功所轉化的熱量一起傳遞給冷卻介質帶走。

The condenser is the equipment to release the heat, which passes the heat absorbed in the evaporator together with the heat transferred from the compressor work to the cooling medium.

實際冷庫制冷系統中，除上述四大件之外，還有一些輔助設備，如電磁閥、分配器、干燥器、集熱器、易熔塞、壓力控制器等部件組成，它們是為了提高運行的經濟性，可靠性和安全性而設置的。

The cold storage refrigeration system, in addition to the above four parts, there are some auxiliary equipment, such as solenoid valves, dispensers, dryers, heat collector, fusible plug, pressure controller and other components, they are in order to improve the economic operation, reliability and safety setting.

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