逆流式气-气换热器的设计与性能试验

介绍了一种逆流式气-气换热器的结构、设计及工作过程，并利用数值计算与现场试验的方法对该换热器进行了性能测试。该气-气换热器采用聚丙烯（PP）塑料材料作为换热片，流体方向为逆流式换热。数值方法计算结果表明，换热器换热量与风量呈正相关关系，换热效率随热端风量的增大而提高：热端风量为4 475 m3/h时，换热效率为0.55～0.75；热端风量为7 800 m3/h时，换热效率为0.6～0.8。性能测试的结果表明，该换热器的实际换热效率与数值计算的换热效率基本吻合：热端风量为4 475 m3/h时，实测值为0.45～0.7；热端风量为7 800 m3/h时，实测值为0.65～0.9。因此，该PP逆流式气-气换热器具有很好的换热性能。

Design and performance test of a counter flow gas-gas heat exchanger

A gas-gas heat exchanger (GGHE) was designed and its working process was introduced in this paper. Based on the numerical method, a commercial prototype of GGHE was worked out and manufactured, and its performance was tested. Polypropylene (PP) plastic material was used to make the heat transfer fins and the counter flow of hot and cold gases in GGHE was achieved. The calculation results showed that there was a positive correlation between the quantity of heat-transfer and air volumes, and the efficiency of heat-transfer increased with rise of hot air volume as well. The calculated heat-transfer efficiency was 0.55-0.75, 0.6-0.8 when hot air volume was 4 475 , 7 800 m3/h, respectively. Meanwhile the efficiency of measured heat-transfer was 0.45-0.7, 0.65-0.9 while hot air volume was 4 475, 7 800 m3/h, respectively. The experimental values matched with calculated ones, this indicated that the PP GGHE had good heat-transfer performance and the design of GGHE was reasonable.