What Is a Condensing Unit?

The condensation coefficient is the condensation of gas or liquid when it is cold. For example, water vapor turns to water when it is cold, and water turns to ice when it is cold. The lower the temperature, the faster the condensation speed and the better the effect. In chemical production, it is generally relatively easy to obtain, so low-cost water or air is used as the condensing medium. After the condensation operation, the temperature of water or air will rise, and direct discharge will cause thermal pollution. Condensation and evaporation are two physical processes with opposite effects.

Condensation is a process that causes the temperature of a hot object to change and usually refers to the process of changing a substance from a gaseous state to a liquid state. Condensation and evaporation are two unit operations with opposite effects.

In chemical production, the equipment to achieve cooling and condensation is usually a wall heat exchanger. Common cooling and condensing media are cold water, brine, and so on. In general, the cooling effect achieved by cold water is not lower than 0 ° C; the cooling effect of brine with a concentration of about 20% is -15 ~ 0 ° C. Cooling and condensing operations are easily overlooked in chemical production. In fact, it is very important and seriously affects safety in production. ^[1]

The condensation process is mainly divided into two types, one is called film condensation, and the other is called drop condensation.

1.Film condensation

The condensate can well wet the wall surface and form a continuous liquid film on the wall surface. The condensation process only occurs at the interface between the liquid film and the vapor. The vaporization phase change enthalpy released by condensation must pass through this liquid film. To the cooling wall, this condensation is called

A condenser is a device that condenses vapor into a liquid. During the condensation process, the vapor transfers heat to the coolant. A variety of condensers are often used in petrochemical processes, of which the most widely used in the two-phase flow heat transfer condensation process, such as condensation of gas distillate at the top of the distillation column, condensation of water vapor, refrigerant vapor Condensation etc. The main equipment involved in the condensation process are: shell and tube condensers, air coolers, plate condensers and spiral plate condensers.

The process of vapor condensation can also be used to heat or evaporate the coolant, so it can be called a condenser, evaporator, reboiler or heater according to the different purposes of the heat exchange process. ^[2]