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The structure of the horizontal shell and tube type condenser is basically similar to that of the liquid supplying method, which can be divided into two kinds of shell and tube evaporator and dry type evaporator. Horizontal shell and tube evaporator are widely used in closed brine circulation system. Its main features are: compact structure, liquid and heat transfer surface contact, high heat transfer coefficient. But it needs to be filled with a large number of refrigerant, the liquid column on the evaporation temperature will have a certain impact. And when the concentration of Saline Brine Pump for reducing or stopping, saline frozen in tube. If the refrigerant freon, lubricating oil is difficult to return the dissolved Freon compressor. Also need to stop working when cleaning. The main difference is that the dry evaporator freon refrigerant flow in the tube, and the refrigerant flow in tube. After throttling liquid Freon from one side of the end cover of the lower into the evaporator, through the upper part of the process from the rear end cover leads to the refrigerant in the tube with flow and continuous evaporation, so the wall is part of vapor occupied. Therefore, its heat transfer effect as full of liquid. But it has no effect on the evaporation temperature of the liquid column, and because the Freon velocity is high (more than 4m/s), while the oil well. In addition, because the tube is filled with a refrigerant, thereby slowing the danger of freezing. The refrigerant in the evaporator to the full liquid type 1/2 to l/3 or less, so it is called "dry evaporator".