According to the survey, the structure of the cooler was optimized and improved, and the thermal performance of the heat exchanger before and after the improvement was tested using the platform-heat exchanger performance test bench. Two methods for enhancing the heat transfer performance of the cooler are proposed:
One is to design a heat exchanger (evaporator) fin tube that is easy to frost under low temperature conditions to be a variable pitch fin structure, which increases the heat transfer area of the fins inside the tube and increases the flow rate of the gas flow inside the tube.
The other is to design the equal-pitch internal threaded tube of the heat exchanger under the air conditioning condition as a variable pitch internal threaded tube to increase the disturbance of the airflow in the tube and improve the heat transfer coefficient. The thermal performance of the heat exchanger improved by these two methods was calculated. The results show that the heat transfer coefficient is increased by 98% and 382%, respectively.
At present, the most common and widely used at home and abroad is the partition wall type. The design and calculation of other types of coolers are often borrowed from the partition wall heat exchanger. Research on heat exchangers has focused on how to improve their heat transfer performance.
Post time: Aug-20-2022