What is the efficient operating temperature of Teflon heat exchanger?

Teflon heat exchangers are widely used in waste heat recovery and thermal systems. In order to obtain economic benefits, it is necessary to participate in the optimal design of heat exchangers. Teflon heat exchangers can recover heat energy, but increase investment and operating costs. The optimal design of Teflon heat exchangers is not unified and recognized. More practices are to adopt multiple heat transfer efficiency units (E-NTU) methods.

The temperature of the heat exchanger depends on the process conditions. Although we hope to increase the heat transfer and heat transfer temperature and pressure intensity, the medium temperature is too high or too low. Scaling, precipitation and crystallization may occur, but the heat transfer deteriorates. At the same time, the choice of medium temperature has an important impact on the selection of wall materials and thermal compensation requirements. It is not worth pursuing high efficiency and economy.

The hot end temperature is not less than 20°C, the cold end temperature difference is not less than 5°C, the initial temperature of the cooler or condenser of the coolant should be higher than the freezing point of the liquid to be cooled, the condensation of non-condensable gases, the final temperature of the coolant is lower than the dew point temperature of the condensing gas by 5°C, and the air outlet and inlet of the hot fluid should be no less than 20°C. The air cooling temperature. These indicators can be calculated technically and economically. Of course, these indicators should be considered comprehensively according to different occasions and purposes.

The evaluation of Teflon heat exchangers should be based on technical and economic analysis and comprehensive consideration, such as technology, economy, safety, manufacturing, installation, operation and maintenance, and material requirements. In particular, the improvement projects of energy-saving heat exchangers should pay attention to the technical and economic indicators such as heat exchanger efficiency, equipment investment, and operating costs of the heat transfer coefficient K under the same pressure conditions. On a comparable basis, such evaluation has a universal guiding significance.