The influence of temperature alternation on the air side pressure drop and heat transfer performance of copper tube copper fin evaporator and copper tube aluminum fin evaporator was experimentally studied. The experimental results show that the air side pressure drop of the new copper tube copper fin evaporator is greater than that of the new copper tube aluminum fin evaporator, but after temperature alternation, the air side pressure drop of the two evaporators is almost the same, with the same long-term pressure drop characteristics;
Temperature fluctuations can lead to a decrease in heat transfer performance between copper tube copper fin evaporators and copper tube aluminum fin evaporators, with the greatest reduction observed at an air flow rate of 400m3/h. Aluminum fin evaporators experience a decrease of 1091.5W, while copper fin evaporators experience a decrease of 704.8W; Compared with before temperature alternation, the heat transfer coefficient of copper fin evaporator decreased by 8.1%~25.2%, and the heat transfer coefficient of aluminum fin evaporator decreased by 10.6%~40.7%. The copper tube copper fin evaporator has better long-term characteristics.
Heat pipe technology is a new type of heat transfer technology. In recent years, heat pipe heat exchangers have been widely used due to their high efficiency, high thermal conductivity, and good isothermal properties. Based on the given technical parameters, this article designs and develops a gas-liquid finned tube heat exchanger, explains the basic structure and working principle of the heat exchanger, and introduces the selection and design of the main structure of the heat exchanger.