管翅式交叉流重力热管背板换热性能试验研究

Experimental study on heat transfer performance of fin-tube cross-flow gravity heat pipe backplanes

介绍了重力热管背板系统的工作原理,试验研究了不同管径管翅式交叉流重力热管背板的换热性能差异。结果表明:在本文对比测试工况下,改进的7小管径换热器的换热性能满足现有9.52管径换热器的换热要求,且可节约材料成本12.9%;在实际应用中,背板供液过冷度和出气过热度建议均控制在0.5~1.5℃之间,供液和出气温差建议控制在1~2℃之间;重力热管背板系统换热量未达到换热极限时,通过降低冷凝单元供水温度和提高背板回风温度均可有效提升换热量。

In this paper,the working principle of the gravity heat pipe backplane system is presented,and the differences in heat transfer performance of the fin-tube cross-flow gravity heat pipe backplane with different pipe diameters are experimentally studied.The results show that under the comparative test conditions in this paper,the heat transfer performance of the improved 7 small tube-diameter heat exchanger can meet the heat transfer requirements of the existing 9.52 tube-diameter heat exchanger,and the material cost can be saved by 12.9%.In practical application,it is recommended that the temperature of the liquid supply subcooling and the gas outlet superheat of the backplane should be controlled between 0.5℃and 1.5℃,and the temperature difference between liquid supply and gas outlet should be controlled between 1℃and 2℃.When the heat transfer capacity of the gravity heat pipe backplane system does not reach the heat transfer limit,the heat transfer rate can be effectively improved by reducing the water supply temperature of the condensing unit and increasing the return air temperature of the backplane.