We often talk about the refrigeration heat exchangers of industrial chillers, mainly condensers and evaporators, which are two of the four major components of refrigeration, directly affecting the ability and efficiency of the system to absorb and release heat. Water-cooled chiller|Air-cooled chiller|Screw-type chiller|Low-temperature chiller-industrial chiller refrigeration heat exchanger introduction and heat transfer process analysis: We often talk about the industrial chiller refrigeration heat exchanger, mainly refers to condensation And evaporators, which are two of the four major components of refrigeration, directly affecting the ability and efficiency of the system to absorb and release heat. Both the condenser and the evaporator involve phase change heat transfer, which is a major feature of both refrigeration heat exchangers. In addition, some refrigeration systems also have intercoolers, subcoolers, etc., the principle is similar to the general heat exchanger.
For the cooling towers used in water-cooled chillers, it is an indispensable water-cooling equipment for large-scale centralized refrigeration systems. Although it is not a refrigeration heat exchanger, it does participate in heat exchange, and we also summarize it.
So, what is the heat transfer process? In industrial chiller refrigeration systems, high temperature, high pressure refrigerant vapor entering the condenser is condensed into liquid by air or cooling water in the surrounding environment; low temperature refrigerant liquid entering the evaporator is from ambient air or brine. It absorbs heat and vaporizes, so that the temperature of a certain area is lowered to achieve the purpose of refrigeration. The process of transferring heat between the refrigerant and the surrounding fluid through the tube wall becomes a heat transfer process.
According to the form of solid wall, there are three main heat transfer processes in common refrigeration equipment (such as screw chillers, air-cooled chillers, water-cooled chillers, low-temperature chillers, open chillers), that is, through flat walls. Heat transfer process, heat transfer through the tube, and heat transfer through the 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 diameter of the round pipe to the pipe wall is large, the pipe wall can be approximated as a flat wall), the heat is from The high temperature liquid on one side passes through the wall to the low temperature fluid on the other side, forming heat transfer through the flat wall.
2. Round tube heat transfer: In the condenser and evaporator of the refrigeration system, a large number of copper and steel heat transfer tubes are used, so heat transfer through the round tube is very common.
3. Heat transfer of the Le-wall: It can be seen from the heat transfer equation that the heat transfer 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 extent and it is difficult to increase it, the heat transfer amount can be increased by increasing the heat transfer denomination, usually by processing the fins or fins on the heat exchange wall.
Shenzhen Dongyuejin chiller factory has independent evaporator and condenser production workshops. All heat exchangers are made of high quality externally threaded copper tubes. They have high-strength sealing structure and excellent sealing performance, which increases the heat exchange of the unit. Capability, high absorption and exothermic efficiency, and HCFC, HFC, R22 or other types of refrigerant can be used together.
Shenzhen chiller factory: http://
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