Science and Technology for the Built Environment ( IF 1.9 ) Pub Date : 2021-03-30 , DOI: 10.1080/23744731.2021.1885901 Yanlin Ren 1 , Chunmei Guo 1 , Jian Lv 1 , Jixiang Xu 2 , Sihang Dong 1 , Dandong Meng 3 , Xuejian Ma 1 , Shiwei Guo 4
The film wetted area is a significant factor affecting the heat and mass transfer of liquid desiccant. In this article, a mathematical model with wetness coefficient of cross-flow energy recovered indirect evaporative cooling (ERIEC)-assisted liquid desiccant dehumidifier (LDD) based on a finite-element method was developed to predict the effect of wetness coefficient on the plate heat exchanger (PHE) effectiveness and dehumidification efficiency, taking into account the thermal resistance and incomplete wetting of liquid film. In addition, an experimental system of a cross-flow ERIEC-assisted LDD was established to validate the model; the validation of the model demonstrated good agreement with the experimental data to within 10%. With this model, increasing the wetness coefficient from 0.1 to 1, the PHE effectiveness gradually increased from 3.7% to 39.1% and the dehumidification efficiency increased gradually from 3.5% to 35.2%. This meant that the nonwetting or partial wetting of liquid film hindered the dehumidification performance. Therefore, a novel TiO2 super-hydrophilic coating was applied to raise the wetness coefficient and improve the dehumidification performance. Within the experimental range, spraying a super-hydrophilic coating (1% nanosized TiO2 solution) in the primary channel of the dehumidifier could increase the PHE effectiveness and dehumidification efficiency by 2.5–5% and 5–30%, respectively.
中文翻译:
改进喷嘴和表面湿度的错流能量回收间接蒸发冷却 (ERIEC) 辅助液体干燥剂除湿机 (LDD) 的实验研究
薄膜润湿面积是影响液体干燥剂传热传质的重要因素。在本文中,基于有限元方法开发了具有横流能量回收间接蒸发冷却 (ERIEC) 辅助液体干燥剂除湿机 (LDD) 湿度系数的数学模型,以预测湿度系数对板式热量的影响。换热器 (PHE) 效率和除湿效率,同时考虑到热阻和液膜的不完全润湿。此外,还建立了横流ERIEC辅助LDD实验系统对模型进行验证;模型的验证表明与实验数据的一致性在 10% 以内。使用该模型,将湿度系数从 0.1 增加到 1,PHE 的有效性从 3 逐渐增加。7%~39.1%,除湿效率从3.5%逐渐提高到35.2%。这意味着液膜的不润湿或部分润湿阻碍了除湿性能。因此,一种新型的 TiO2.采用超亲水涂层,提高润湿系数,改善除湿性能。在实验范围内,在除湿机主通道喷涂超亲水涂层(1%纳米TiO 2溶液)可使PHE效率和除湿效率分别提高2.5-5%和5-30%。