| 摘要: |
| 介绍了一种椭圆型套管-管翅式蒸发式冷凝器，通过搭建的蒸发式冷凝器性能测试实验系统，研究该蒸发式冷凝器在不同循环水配比、不同地区环境以及“风冷”、“水冷”、“蒸发冷凝”和“全工况”4种不同运行模式下的传热传质性能与运行特性的变化规律。结果表明：在相同条件下“全工况”模式的热流密度高于“风冷”和“蒸发冷凝”两种模式，而“水冷”模式由于其传热面积远小于其它模式，所以其热流密度最高；“全工况”模式在保持配风量及循环水总量一定的条件下，热流密度随循环水配比的增大而先增大后减小，喷淋水与冷却水的流量最佳配比为2∶5；“全工况”模式在严寒干燥地区、寒冷地区以及夏热冬暖地区的总热流密度分别为5 879.64 、3 964.28 及2 933.05 W/m2，因此不同地区环境运行的传热性能相差较大，该冷凝器“全工况”模式在空气干燥的地区，喷淋冷却水温度范围为13~18 ℃运行时传热性能较优。在相同的条件下，“蒸发冷凝”模式的水膜传质系数高于“全工况”模式，且两者均随喷淋密度的增大先增大后减小。 |
| 关键词: 蒸发式冷凝器 椭圆型套管-管翅式换热器 传热传质性能 运行特性 实验分析 |
| DOI： |
| Received:March 07, 2023Revised:May 20, 2023 |
| 基金项目:陕西省自然科学基础研究计划项目（2023-JC-YB-473）和西部绿色建筑国家重点实验室开放基金项目（LSKF202314）资助。 |
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| Experimental Study of Heat and Mass Transfer Performance of Annular Elliptic Finned Tube Evaporative Condenser |
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Li Hanlin1, Gu Yaxiu1, He Yuefei1, Liu Liwen2
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| (1.School of Civil Engineering, Chang’an University;2.Shanxi Country Garden Real Estate Development Co., Ltd.) |
| Abstract: |
| This study introduces an annular elliptical finned-tube evaporative condenser. The heat and mass transfer performance and operation characteristics of the evaporative condenser under different circulating water ratios, different regional environments, and four different operating modes are determined by the experimental system of the evaporative condenser, in which the air-cooled, water-cooled, evaporative-cooled, and full working modes are studied. The results show that the heat flux of the "full working" mode is higher than that of the "air-cooled" and "evaporative-cooled" modes under the same conditions; the "water-cooled" mode has the highest heat flux because its heat transfer area is much smaller than that of other modes. Under the "full working" mode with a fixed air volumetric flow rate and the total amount of circulating water, the heat flux increases first and then decreases with the increase in the water circulating ratio, where the best flow rate ratio between spray water and cooling water is 2:5. The total heat flux of the "full working" mode in dry cold areas, cold areas, and hot summer and warm winter areas is 5 879.64 W/m2, 3 964.28 W/m2, and 2 933.05 W/m2, respectively. Hence, the heat transfer performance of the "full working" mode varies significantly in different regions, and the "full working" mode of the condenser has better heat transfer performance when the spray and cooling water temperature ranges from 13 to 18 ℃. Under the same conditions, the mass transfer coefficient of the water film in the "evaporative-cooled" mode is higher than that in the "full working" mode, which of both modes increases and then decreases with the increase of the spray density. |
| Key words: evaporative condenser annular elliptic finned tube heat exchanger heat and mass transfer performance operating characteristic experimental analysis |
