In the heat transfer process of a plate heat exchanger, the greater the total thermal resistance, the more critical it is to take measures to enhance the heat transfer effect by improving the equipment's heat transfer coefficient. In fact, the value of the heat transfer coefficient of a plate heat exchanger is determined by the magnitude of the total thermal resistance in the heat transfer process: the lower the heat transfer coefficient of the plate heat exchanger, the poorer its heat transfer effect.
To enhance the heat transfer efficiency of plate heat exchangers and thereby improve their heat transfer coefficient, a variety of enhanced components and strengthening measures have been developed at home and abroad. These mainly include the use of threaded tubes, transverse ribbed tubes, converging-diverging tubes, large-lead multi-start grooved tubes, and integral double-sided spiral finned tubes in plate heat exchangers, as well as the addition of turbulators inside the heat exchange tubes of plate heat exchangers to enhance in-tube heat transfer. Among these methods, the use of turbulator inserts in the heat exchange tubes of plate heat exchangers to strengthen heat transfer has been applied in industry for many years. This method can significantly increase the total heat transfer coefficient of plate heat exchangers, greatly save their heat transfer area, reduce equipment weight, and conserve large amounts of metal materials. Its numerous advantages have attracted increasing attention. However, such enhancement cannot be unlimited-expanding the heat transfer area and increasing the heat transfer temperature difference are often restricted by factors such as site space, equipment conditions, capital investment, and actual effectiveness.
Currently, the main direction of technical evaluation for enhanced heat transfer in plate heat exchangers is how to improve the effect of enhanced heat transfer by controlling the value of the plate heat exchanger's heat transfer coefficient. The most widely used technology to increase the heat transfer coefficient of plate heat exchangers today is the addition of turbulator inserts in their heat exchange tubes. Through the action of these turbulator inserts, the partial thermal resistances in the heat transfer process of the plate heat exchanger are significantly reduced, ultimately achieving an increase in its heat transfer coefficient. During the operation of a plate heat exchanger, its total thermal resistance is the sum of various partial thermal resistances. Therefore, to change the heat transfer coefficient, it is necessary to analyze each partial thermal resistance in the heat transfer process. How to control each partial thermal resistance in the heat transfer process of a plate heat exchanger is the key to determining its heat transfer coefficient.
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