关键词: 板式冷凝器, 气液分离, 强化传热, 压降, 换热系数

Abstract: 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 coefficient 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．

Key words: plate condenser, liquid-vapor separation, enhanced heat transfer, pressure drop, heat transfer coefficient