Air conditioner evaporator is a kind of evaporator. The role of the air conditioner evaporator is to use the liquid cryogenic refrigerant to easily evaporate under low pressure, transform it into steam and absorb the heat of the cooled medium to achieve the purpose of refrigeration. It relies on a fan to force the air in the warehouse to flow through the cooling pipes in the box for heat exchange to cool the air, thereby reducing the temperature of the warehouse. Then Ford Focus AC Condenser Supplier will introduce to you in detail what the car air conditioner evaporator is called.
Depending on the type of cooling medium, the evaporator can be divided into two categories:
(1) An evaporator that cools a liquid refrigerant. Used to cool liquid refrigerants-water, brine or ethylene glycol solution. Such evaporators are commonly used in horizontal evaporators, vertical tube evaporators and spiral tube evaporators.
(2) Evaporator for cooling air. This type of evaporator has cooling pipes and coolers.
VOLVO S80 Auto AC Evaporator
1. Horizontal evaporator
Its structure is basically similar to the horizontal shell and tube condenser. It can be divided into shell and tube evaporator and dry evaporator according to the liquid supply method. Horizontal shell and tube evaporators are widely used in closed brine circulation systems. Its main features are: compact structure, good contact between liquid and heat transfer surface, and high heat transfer coefficient. However, it needs to be filled with a large amount of refrigerant, and the liquid column will have a certain effect on the evaporation temperature. And when the brine concentration decreases or the brine pump stops for some reason, the brine may be frozen in the tube. If the refrigerant is Freon, it is difficult for the lubricating oil dissolved in Freon to return to the compressor. In addition, it is necessary to stop working during cleaning. The main difference between a dry Freon evaporator is that the refrigerant flows inside the tube and the refrigerant flows outside the tube. The throttled Freon liquid enters the evaporator from the lower part of the end cap on one side, and is drawn out from the upper part of the end cap after several processes. The refrigerant continuously evaporates as the tube flows, so a part of the wall surface is occupied by the vapor. , Its heat transfer effect is not as good as the full liquid type. However, it has no effect of liquid column on evaporation temperature, and the return of oil is better due to the higher Freon flow rate (≥4m / s). In addition, because the tube is filled with a large amount of refrigerant, the risk of freezing is reduced. The refrigerant charge in this evaporator only needs 1/2 ~ l / 3 or less of the full liquid type, so it is called "dry evaporator".
2.Riser tube evaporator
The common point of the riser and spiral evaporators is that the refrigerant evaporates in the tube. The entire evaporator tube group is immersed in a container (or pool or tank) filled with refrigerant. In order to ensure that the refrigerant is in the container, Cycling at a certain speed, the box is welded with longitudinal partitions and equipped with a spiral mixer. The flow rate of the refrigerant is generally 0.3-0.7m / s to enhance heat transfer.
These two types of evaporators can only be used in open circulation systems, so the refrigerant must be non-volatile, usually salt water and water. If salt water is used, the evaporator tube is easily oxidized, and the salt water is easy to absorb moisture and reduce the concentration. These two evaporators can directly observe the flow of the refrigerant and are widely used in brine refrigeration systems using ammonia as the refrigerant.
Well, today the VOLVO S80 Auto AC Evaporator supplier introduces the car air-conditioning evaporator what is called here, I do not know after listening to my introduction, do you have a deeper understanding of what is the car air-conditioning evaporator? I hope the introduction of the editor will be helpful to everyone.