700= DN700
185= heat exchange area 185m2.
25= The outer diameter of the heat exchange tube is 25mm.
2=2 passes (tube pass)
In industrial production, in order to meet the needs of industrial process, it is often necessary to carry out various ways of heat conversion, such as heating, cooling, evaporation and condensation. A heat exchanger is a device used to realize the above heat exchange and transfer. Through various devices, heat is transferred from the fluid with higher temperature to the fluid with lower temperature to meet the needs of the production process. The plastic heat exchanger widely used in heat exchangers is a fluoroplastic heat exchanger with strong corrosion resistance. Dupont Company of the United States was successfully manufactured and commercialized for the first time in 1965. China has also invested a lot of money and manpower in the research and development of fluoroplastic heat exchangers. 1985, Zhengzhou University of Technology successfully developed the process of "PTFE (F-4 for short) tube sheet expansion joint-pressure-limited heating welding", which solved the key technology of the connection between fluoroplastic pipe and tube sheet. Subsequently, various types of domestic fluoroplastic heat exchangers have been put into practical production and application, and good results have been achieved. At present, the fluoroplastic heat exchanger has developed from a single manufacturer's on-demand production to a series production with enterprise standards to control the finalized design. There are many differences between traditional heat exchangers and fluoroplastic heat exchangers. For example, the common metal heat exchanger has the defects of easy corrosion and the change of heat transfer coefficient caused by the change of dirt layer thickness. Heat exchangers made of nonmetallic materials have some disadvantages, such as fragility, large volume and low efficiency. Heat exchangers made of precious and rare metal materials are difficult to popularize and apply because of their high price. Fluoroplastic heat exchanger can make up for these defects to a great extent. Friction heater is a kind of heat exchanger, also known as heat exchanger. This "heater" is connected to the heating pipe, and there is no gas or electricity. The high-temperature hot water of the heating exchanges heat with the tap water in the equipment, and the hot water can be used continuously.