Heat Exchange And Refrigeration Equipment

Heat exchange and refrigeration equipment is mainly concerned with the realization of heat exchange between fluid media at different temperatures, such equipment in refrigeration and air conditioning, HVAC, chemical, petroleum, power, food and many other industrial sectors occupy an important position.

It is mainly based on heat exchange, that is, heat transfer from hot fluid to cold fluid through some medium or wall. According to the principle and method of heat exchange of cold and hot fluids, these devices can be basically divided into three categories: wall type, hybrid type and regenerative type. In the field of refrigeration and air conditioning, HVAC, etc., it mainly involves mixed heat exchangers and inter-wall heat exchangers, of which the inter-wall heat exchanger is the most used.

1.Wall heat exchanger
also known as surface heat exchanger, it uses a metal wall (tube wall and plate wall) to separate the cold and hot fluids for heat exchange, and the heat transfer process is completed through the convection heat exchange between the metal wall and the fluid and the thermal conductivity of the wall. There are many structural types of inter-wall heat exchangers, including shell tube type, finned tube type, sleeve type, plate fin type, spiral plate and plate type.
2.Hybrid heat exchanger
relies on the direct contact of cold and hot fluids for heat transfer, this heat transfer method avoids the heat transfer wall and the dirt thermal resistance on both sides, as long as the contact between the fluids is good, there is a larger heat transfer rate.

1.Condenser
In a refrigeration system, the condenser is a device for the high-temperature refrigerant to transfer heat to the cooling water through the wall. There are many types of condensers, such as shell and tube condensers, tube condensers, etc., which are widely used in large central air-conditioning water-cooled units, ammonia refrigeration systems, etc.
2.Evaporator
Evaporator is a device that vaporizes refrigerant and absorbs heat. In a full-liquid evaporator, the refrigerant is vaporized through a wall facing the brine to absorb heat. Evaporator also has a variety of structural forms, such as finned tube evaporator, spiral tube evaporator and so on.

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