What Is an Evaporator?

The evaporator is a very important part of the four major pieces of refrigeration. The low-temperature condensed liquid passes through the evaporator to perform heat exchange with the outside air, and vaporizes and absorbs heat to achieve the effect of refrigeration.

1. Divided by evaporation:
Natural evaporation: That is, the solution evaporates at a temperature lower than the boiling point, such as sea salt. In this case, because the solvent only vaporizes on the surface of the solution, the solvent vaporization rate is low.
Boiling evaporation: The solution is heated to the boiling point and allowed to evaporate in the boiling state. This is basically the case for industrial evaporation operations.
2. Divided by heating method:
Direct heat source heating is an evaporation process in which fuel and air are mixed, and the high-temperature flame and smoke generated by combustion are sprayed directly into the evaporated solution through a nozzle to heat the solution and vaporize the solvent.
The indirect heat source heats the walls of the container to the evaporated solution. I.e.
The calculation of the evaporation area of the ice bank evaporator is the same as that of other cold room evaporators. It can also be selected according to the net area of the ice storage. Generally, the evaporation area is 0.6 ~ 0.7m2 based on one square meter. The temperature of the ice storehouse should be determined according to the type of ice stored. The temperature of the ice storehouse storing brine ice should be -4 ° C, and the temperature of the ice storehouse storing broken ice should be -18 ~ -15 ° C. When designing the piping of the refrigeration system, it should be considered that the ice storage can still cool down when the ice machine is not in production. The defrost method of the evaporator can be manual defrost.
When the evaporator is installed, there is no need to install wall pipes for the ice bank with a building net height of less than 6m, but the top row of pipes must be scattered and distributed. Sheet tube to prevent stacking and icing type crash. [2]
Fault name
phenomenon
the reason
elimination method
Evaporation pressure is too low
The difference between the evaporation temperature and the outlet temperature of the refrigerant increases
1.Insufficient refrigerant charge
Additional
1. Leak detection of the evaporator is often performed. Leakage is a common failure phenomenon of evaporators. Pay attention to leak detection frequently during use.
1.The effect of frost on the refrigeration system
Evaporation is a unit operation that uses a heating method to heat a solution containing a nonvolatile solute to a boiling state, to vaporize and remove a portion of the solvent, and thereby increase the concentration of the solute in the solvent. There are several occasions in which evaporation is applied in industrial production:
1. Concentrate the dilute solution to make the product directly or reprocess the concentrated solution (such as cooling crystallization) to make solid products, such as the concentration of electrolytic caustic soda solution, the concentration of sugar aqueous solution and the concentration of various fruit juices.
2. Concentrate the solution and recover the solvent at the same time, such as the concentrated debenzene of organophosphorus pesticide benzene solution, the evaporation of alcohol extract in Chinese medicine production, etc.
3. In order to obtain pure solvents, such as desalination.
In short, in the chemical industry, food industry, pharmaceutical and other industries, evaporation operations are widely used. [2]
Rising film evaporator

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