The condenser maintenance of the four components of the chiller unit explains that any condenser equipped with a chiller will gradually degrade its performance over time. As a result, the condensing pressure of the system will be higher than the condensing pressure during normal operation. In order not to degrade the condenser, the condenser needs to be regularly maintained.
The condensers used in the cabinet chillers are mainly air-cooled condensers and water-cooled condensers. According to the type of condenser to clean, the way to clean the scale is not the same, here is to explain the two commonly used condenser maintenance:
1, air-cooled condenser is based on the air as a cooling medium, because the air often dust, some of the dust will be bonded to the condenser fins on the outer surface, a long time, will make the condenser cooling effect worse, Especially where the environment is harsh, it should be cleaned regularly. The cleaning method is: simple dust can be blown clean with compressor air, etc. If there is more dirt, non-corrosive cleaning agent should be used to clean the heat pipe and fins to achieve the purpose of improving heat dissipation.
2. For water-cooled condensers, the main problem is to remove scale. The cleaning cycle depends on the quality of the water. Poor water quality (such as landscape and deep well water) is cleaned at least once a year. The water quality is good and can be cleaned once every 2 to 3 years.
A small water-cooled chiller is equipped with a jacket-type water-cooled condenser that can be pickled. The specific method of operation is to remove the condenser and release the accumulated water, and then inject 10% of dilute sulfuric acid solution into the chamber until the outlet of the outlet has a solution. Diluted sulfuric acid can stay in the condenser for 20 to 30 minutes before being released. This is repeated two or three times. Finally, the connecting pipe for the cooling water pipe and the condenser is installed, and the cooling water valve is opened for 10 to 20 minutes. The anti-scaling and cleaning work is finished.
The condenser heat transfer process of the four components of the chiller is explained: We often refer to the refrigeration heat exchangers of the chillers, which mainly refer to the condensers and evaporators. They are the two major parts of the four major refrigeration components and directly affect the system. The ability and efficiency of heat absorption and heat release. Both the condenser and the evaporator involve phase change heat transfer, which is a feature of these two types of refrigeration heat exchangers. In addition, some refrigeration systems have intercoolers, supercoolers, etc., and their principles are similar to those of ordinary heat exchangers.
For cooling water towers used with chillers, it is an indispensable water cooling device for large-scale centralized refrigeration systems. Although it cannot be considered as a refrigerating heat exchanger, it does participate in heat exchange. We have also included it in this category.
So, what is the heat transfer process? In a chiller refrigeration system, the high-temperature, high-pressure refrigerant vapors entering the condenser are condensed into liquid by the ambient air or cooling water; the low-temperature refrigerant liquid entering the evaporator is sucked from the surrounding air or the brine. Heat and gasification, so that a certain area of â€‹â€‹the temperature drop, to achieve the purpose of refrigeration. The process of transferring heat between the refrigerant and the surrounding fluid through the pipe wall becomes a heat transfer process.
According to the form of the solid wall, there are mainly three kinds of heat transfer processes in the commonly used refrigeration equipment (such as screw chiller, cryogenic chiller, chiller, and industrial chiller), that is, through the flat wall heat transfer process, through the round tube The heat transfer process and the heat transfer process through the Le wall.
1, flat wall heat transfer: When the heat transfer wall is a flat plate, or can be approximated as a flat wall (when the ratio of the pipe diameter and the pipe wall is large, the pipe wall can be approximately flat), heat from One side of the high-temperature liquid passes through the wall to the other side of the cryogenic fluid, forming a heat transfer through the flat wall.
2. Circular tube heat transfer: In the condenser and evaporator of the refrigeration system, copper and steel heat transfer tubes are widely used, so heat transfer through the tube is very common.
3. Heat transfer from Le wall: It can be seen from the heat transfer equation that the heat transfer amount per unit time increases not only with the increase of the heat transfer coefficient, but also with the increase of the heat transfer surface. When the heat transfer coefficient is increased to a certain degree and it is difficult to increase it, the heat transfer amount can be increased by increasing the heat transfer denomination, and it is usually processed on the heat exchange wall by processing a lew or fin.
Johnson Machinery Tips: In the industrial chiller refrigeration system, compressors, evaporators, condensers, and throttling devices are indispensable for the refrigeration system. The condenser is a device that emits heat and vaporizers. The heat absorbed in the compressor is transferred to the cooling medium together with the heat converted by the compressor's work. It is responsible for one of the important roles of the refrigeration system. Once the performance is reduced, it directly affects the cooling capacity of the chiller. Therefore, the condenser is maintained once a year. necessary.