分液型板式冷凝器强化冷凝换热的实验研究

Experimental Study on Enhanced Heat Transfer Characteristics of Plate Condenser with Liquid-Vapor Separation

创新设计了可以实现中间排液功能的分液型板式冷凝器。该冷凝器中间位置设置分液口,可以加快排液速度,减小附着在板片上的冷凝液膜的厚度,降低蒸气与板片之间液膜的导热热阻,从而增大板式冷凝器的相变传热系数。将分液型板式冷凝器与常规板式冷凝器进行了性能对比实验。通过10个不同测试工况的实验结果发现,在同等初始条件下,与常规板式冷凝器相比,分液型板式冷凝器工质侧冷凝换热系数提高了8.3%~51.6%,总换热系数提高了7.6%~38.3%,总压降减小了2.6%~11.4%。该实验结果验证了分液型板式冷凝器可以实现强化换热和减小压降的目的,但也由于分液造成第二冷凝区工质流量的减少,而使分液型板式冷凝器总换热量与常规板式冷凝器总换热量大致相等,并无明显增加。

A new type of plate condenser which can discharge condensate in the middle was designed.The drain port was set in the middle of the condenser,which can speed up the drainage,reduce the thickness of the condensate film attached to the plate,reduce the thermal resistance of the liquid film between the vapor and the plate,and increase the phase change heat transfer coefficient of the plate condenser.The performance of the liquid-vapor separation plate condenser(LVSPC)was compared with that of the conventional plate condenser(CPC).The experimental results of 10 different test conditions show that,under the same initial conditions,compared with the CPC,the condensation heat transfer coefficient of the LVSPC is increased by 8.3%~51.6%,the total heat transfer coeffi-cient is increased by 7.6%~38.3%,and the total pressure drop is reduced by 2.6%~11.4%.The experimental results proved that the LVSPC can achieve the purpose of enhancing heat transfer and reducing pressure drop.However,due to the decrease of working fluid flow in the second condensing area,the total heat transfer of the LVSPC is approximately equal to that of CPC,and there is no obvious increase.