Introduction of DYJ series industrial chiller refrigeration heat exchanger and analysis of its heat transfer process

Refrigeration heat exchangers are essential components in industrial chillers, primarily condensers and evaporators. These two elements are among the four main parts of a refrigeration system and play a critical role in determining the system's ability to absorb and release heat efficiently. Both the condenser and evaporator involve phase change processes, which is one of the key characteristics of refrigeration heat exchangers. In addition to these, some systems also include intercoolers or subcoolers, which function similarly to standard heat exchangers. In water-cooled chiller systems, cooling towers are widely used as essential equipment for large-scale centralized cooling. While they are not classified as refrigeration heat exchangers, they still participate in the heat exchange process and are therefore worth mentioning. So, what exactly is the heat transfer process in an industrial chiller? In a refrigeration cycle, high-temperature and high-pressure refrigerant vapor enters the condenser, where it is condensed into liquid by air or cooling water. On the other side, low-temperature refrigerant liquid enters the evaporator, absorbing heat from the surrounding air or brine and turning into vapor. This process lowers the temperature of a specific area, achieving the desired cooling effect. The transfer of heat between the refrigerant and the surrounding fluid through the tube wall is known as the heat transfer process. There are three main types of heat transfer processes commonly found in refrigeration equipment such as screw chillers, air-cooled chillers, water-cooled chillers, and low-temperature chillers: 1. **Flat Wall Heat Transfer**: When the heat transfer surface is a flat plate or can be approximated as one (for example, when the ratio of pipe diameter to thickness is large), heat moves from the high-temperature side through the wall to the low-temperature side. 2. **Round Tube Heat Transfer**: In condensers and evaporators, numerous copper or steel tubes are used, making round tube heat transfer a common occurrence in refrigeration systems. 3. **Finned Wall Heat Transfer**: According to the heat transfer equation, the rate of heat transfer increases with both a higher heat transfer coefficient and a larger heat transfer area. When it becomes difficult to increase the coefficient further, the heat transfer capacity can be enhanced by increasing the surface area, often achieved through finning or adding fins to the heat exchange surface. Shenzhen Dongyuejin Chiller Factory has dedicated production workshops for evaporators and condensers. All heat exchangers are manufactured using high-quality externally threaded copper tubes. They feature a high-strength sealing structure and excellent sealing performance, enhancing the heat exchange capability of the system. These units are compatible with various refrigerants, including HCFCs, HFCs, R22, and others. For more information about chillers, visit: [Shenzhen Chiller Factory](http://) Source: [Hardware Business Network Information Center](http://news.chinawj.com.cn)

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