湿热地区运行参数对波纹翅片管换热器性能的影响研究

Research on influences of operational parameters on the performance of wavy finned-tube heat exchanger in hot and humid regions

鉴于波纹翅片管换热器热湿工况运行优化缺少指南,建立了某9排管空气-水逆流式波纹翅片管换热器的传热除湿数学模型,利用MATLAB编程开展仿真,试验验证了仿真结果之后,在广州和杭州2种湿热气候条件下,探究了水流速度、风速以及进口水温对换热器换热、除湿性能的影响规律。结果显示:风速对换热量影响最大,进口水温对除湿量影响最大;在相同的水温、水速和风速下运行,在广州换热量与除湿量分别比在杭州高23.7%~44.1%和33.5%~64.3%,且几乎不随风速变化而变化,随水温降低高出的比例线性增大。并且,还给出了其在两地运行达到额定换热能力所应采取的各运行参数的区间。

To provide sufficient guidelines for optimizing operational parameters of wavy finned-tube heat exchanger under different thermal and moisture loads,a set of mathematical model was established to solve the heat transfer and dehumidification problem of a 9-row tube air-water counterflow wavy finned-tube heat exchanger.By using Matlab programming,the simulations were conducted and results were validated by experimental data at first.Then,the influence rules of water flow rate,wind speed,and inlet water temperature on heat transfer and dehumidification performances of the heat exchanger were explored under the weather conditions of Guangzhou and Hangzhou.The results show that wind speed has the greatest impact on heat exchange capacity,but inlet water temperature has the greatest impact on dehumidification capacity.Under the same water temperature,water speed and wind speed,the heat exchange and dehumidification capacities in Guangzhou were 23.7%~44.1%and 33.5%~64.3%higher than those in Hangzhou,respectively.And they almost did not vary with the change of wind speed,but increased linearly with the decrease of water temperature.The proper ranges of various operational parameters that should be taken to achieve the rated heat exchange capacity were proposed for operating in Guangzhou and Hangzhou.