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The evaporator is an important part of the four major components of refrigeration. The low-temperature condensed liquid passes through the evaporator to exchange heat with the outside air, vaporizes and absorbs heat, and achieves the effect of refrigeration. The evaporator is mainly composed of a heating chamber and an evaporation chamber. The heating chamber provides the liquid with the heat required for vaporization, and promotes the liquid to boil and vaporize; the vaporization chamber completely separates the gas-liquid two phases. 1. According to evaporation method: Natural evaporation: that is, the solution evaporates at a temperature lower than the boiling point, such as sea water, in this case, because the solvent only evaporates on the surface of the solution, the solvent evaporation rate is low. Boiling Evaporation: The solution is heated to the boiling point and evaporated in a boiling state. Industrial evaporation operations are basically of this type. 2. According to heating method: Direct heat source heating is an evaporation process in which the fuel is mixed with air, and the high-temperature flame and flue gas generated by the combustion are directly sprayed into the evaporated solution through the nozzle to heat the solution and vaporize the solvent. The indirect heat source heats the wall of the container to the solution being evaporated. That is, the heat transfer process carried out in the dividing wall heat exchanger. 3. According to operating pressure: It can be divided into atmospheric, pressurized and reduced pressure (vacuum) evaporation operations. Obviously, for heat-sensitive materials, such as antibiotic solutions, fruit juices, etc., it should be carried out under reduced pressure. High-viscosity materials should be heated by a pressurized high-temperature heat source (such as heat transfer oil, molten salt, etc.) for evaporation 4. According to the number of points: It can be divided into single-effect and multi-effect evaporation. If the secondary steam generated by evaporation is

The variable air volume air conditioner has a cold water coil. Hot water coils are also required for hot and cold single air duct systems and variable air volume systems that need to consider winter preheating. The selection and check calculation of the cooling and heating coils are generally carried out by the air conditioner manufacturer using computer programs. The designer only needs to provide the technical parameters of the selected air conditioner: the inlet and outlet air parameters of the coil; the inlet and outlet water temperatures; , water side resistance requirements and the arrangement position of the coil in the air conditioner. (1) The inlet and outlet air parameters of the coil are the basis for the selection and check calculation of the coil, and are determined by the design calculation. Considering the design margin of the variable air volume air conditioning system and the terminal device, the air supply temperature margin of 0.5~1.0℃ should be considered on the basis of satisfying the design requirements for the outlet air temperature of the coil. (2) The temperature of the inlet and outlet water of the coil is also called the water temperature difference of the coil. It is determined according to the form of cold and heat sources and the type of air conditioner. For variable air volume air conditioning systems, when considering the temperature difference between supply and return water, the following factors should also be noted: 1) The temperature difference between the inlet and outlet water of the fan coil unit is generally small; 2) The temperature difference between the inlet and outlet water of the fresh air conditioner is generally large; 3) When the air volume of the variable air volume air conditioning system is small, the temperature difference between the inlet and outlet water of the coil will also decrease. In order to avoid the phenomenon of large flow and small temperature difference, for the cooling coil, especially for the system with large temperature difference, the water