The evaporator
author: supermarket refrigerated showcase category: commercial refrigeration Views: 574Time: 2016-08-22
in commercial refrigeration The evaporator
in commercial refrigeration is another heat exchange device in the commercial refrigeration refrigeration system. It is a heat exchanger that absorbs heat by refrigerant at low temperatures. In the evaporator, the refrigerant liquid boils at a lower temperature, transforms into vapor, and absorbs the heat of the object or medium to be cooled. Therefore, the evaporator is a commercial refrigeration refrigeration system that produces and outputs cold energy. According to the characteristics of the cooled medium, the evaporator can be divided into two categories: cooling liquid refrigerant and direct cooling air. Various types of evaporators have different types, characteristics and application ranges.
The following describes the structure and working characteristics of several commonly used evaporators.
cooling liquid refrigerant evaporator
shell and tube horizontal evaporator Its structure is simple, the structure of this evaporator is basically similar to the horizontal condenser. When working, the shell should be filled with a considerable amount of refrigerant liquid, and its static liquid level is generally 70% to 80% of the shell diameter, so it is also called a flooded evaporator, and the evaporated vapor is drawn from the upper part. The inlet and outlet of the refrigerant (water or salt water) are set on the same end cover. The refrigerant flows in from below the commercial refrigeration, flows back and forth through the evaporator tube and end cover many times, and then flows out from above. The shell and tube horizontal evaporator has a dirt collector at the lower part of the shell to discharge the deposited lubricating oil and other sundries from it. The ammonia evaporator tube is a seamless steel tube, and the Freon evaporator mostly uses a finned copper tube, and some use a copper smooth tube. In addition, for the shell and tube horizontal evaporator used for Freon, measures must be taken to drain the lubricating oil from the evaporator and return it to the compressor crankshaft for commercial refrigeration. The shell and tube horizontal evaporator has a compact structure and good heat transfer performance. When salt water is used as the refrigerant for commercial refrigeration, the evaporator can realize the closed circulation of the salt water system. It not only has a simple system, but also reduces the corrosion of the salt water to the system pipeline and equipment. However, the shell and tube horizontal evaporator has a large refrigerant charge, and the hydrostatic pressure has a greater influence on the evaporation temperature, and when it is used in Freon, certain oil return measures need to be taken. Therefore, in Freon refrigeration systems, shell and tube dry evaporators will gradually be used instead of shell and tube horizontal evaporators.
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