Numerical Heat Transfer, Part A: Applications ( IF 2 ) Pub Date : 2021-06-23 , DOI: 10.1080/10407782.2021.1940061 Wen-Ken Li, Chun-Han Li, Chung-Yuan Lee, Bing-Bing Wang, Wei-Mon Yan
Abstract
The ambient air with the excessive moisture needs to be dehumidified for a comfortable environment using air conditioning. The planar membrane-based dehumidifier (PMD) is a potential technology to remove moisture in humid air. The performance of PMDs with different operating conditions is evaluated via numerical simulations with focuses on influences of the flow channel geometry, i.e. aspect ratio (AR) of width over height, on the dehumidification performance firstly. The result discloses channels with AR = 2 have the best coefficient of performance (COP). Thus, three-dimensional dehumidifiers are simulated to further understand the physical mechanism of air dehumidification. Finally, an in-depth parametric analysis is carried out with emphasis on the influence of governing parameters on PMD performances, such as dehumidification rate (DR), dew point approach temperature (DPAT), pressure drop (ΔP), and COP. The results show that enhancing mass flow rates leads to an ascending tendency of DR, DPAT, and ΔP, but a descending tendency of COP. Increasing the inlet temperature of dry side results in the reduction of both DR and DPAT, but the increase in ΔP, resulting in the deterioration of the COP. Additionally, the counterflow PMD always has better dehumidification performance than parallel one for various governing parameters.
中文翻译:
平面膜除湿机传热传质数值分析
摘要
需要使用空调对湿度过高的环境空气进行除湿,以获得舒适的环境。基于平面膜的除湿机 (PMD) 是一种去除潮湿空气中水分的潜在技术。通过数值模拟评估了不同操作条件下PMD的性能,重点是流道几何形状,即宽度与高度的纵横比(AR)对除湿性能的影响。结果表明,AR = 2 的信道具有最佳性能系数 (COP)。因此,模拟三维除湿机以进一步了解空气除湿的物理机制。最后,进行了深入的参数分析,重点是控制参数对 PMD 性能的影响,例如除湿率 (DR)、P ) 和 COP。结果表明,提高质量流量导致DR、DPAT和ΔP呈上升趋势,而COP呈下降趋势。增加干侧入口温度导致DR和DPAT均降低,但ΔP增加,导致COP变差。此外,对于各种调节参数,逆流PMD总是比并联PMD具有更好的除湿性能。