There are a large number of Industrial Evaporator Coils in the industry, of which the evaporator used in the refrigeration system is one of them. The evaporator is a very important part of the four major components of refrigeration. The low-temperature condensed liquid passes through the evaporator, exchanges heat with the outside air, vaporizes and absorbs heat, and achieves the effect of refrigeration.

According to the operating pressure, the evaporator is divided into three types: normal pressure, pressurized, and depressurized. According to the movement of the solution in the evaporator, there are 1. Circulation type. The boiling solution passes through the heating surface many times in the heating chamber, such as the central circulation tube type, the hanging basket type, the external heating type, the Levin type, and the forced circulation type. 2. One-way type. The boiling solution passes through the heating surface once in the heating chamber without circulating flow and then discharges the concentrated liquid, such as rising film type, falling film type, stirring film type, and centrifugal film type, etc. 3. Direct contact type. The heating medium directly contacts the solution to transfer heat, such as a submerged combustion evaporator. During the operation of the evaporation device, a large amount of heating steam is consumed. In order to save heating steam, a multi-effect evaporation device and a steam recompression evaporator can be used. Evaporators are widely used in the chemical, light industry, and other sectors.

The vaporizer and volatile inhalation anesthetics used in medicine are all liquid at room temperature. The evaporator can effectively evaporate the volatile anesthetic liquid into a gas, and can accurately adjust the concentration of the anesthetic vapor output. The evaporation of anesthetics requires heat, and the temperature around the vaporizer is the main factor that determines the evaporation rate of volatile anesthetics. Contemporary anesthesia machines widely use temperature-flow compensation type evaporators, that is, when the temperature or fresh airflow changes, the automatic compensation mechanism can keep the volatile inhalation anesthetic evaporating speed constant, so as to ensure that the inhalation anesthetic leaves the evaporator. The output density is stable. Because different volatile inhalation anesthetics have different physical characteristics such as boiling points and saturated vapor pressures, evaporators are medicine-specific, such as enflurane evaporators, isoflurane evaporators, etc., which cannot be used interchangeably. The evaporator of modern anesthesia machines is mostly placed outside the anesthesia breathing loop, connected to it with a separate oxygen gas flow, and the vaporized inhalation anesthetic vapor is mixed with the main gas flow before being inhaled by the patient.