太阳能再生屋面通风除湿床动态再生效果模拟分析

Dynamic simulation analysis of the regeneration performance of a solar-powered ventilated roof desiccant bed

室内湿环境显著影响着人体的舒适和健康,传统的建筑除湿方式往往存在着能耗高、结构复杂、维护成本大的问题。鉴于此,提出了一种屋面通风除湿床,分析了其再生阶段的热湿传递过程,建立了其动态传热传质数值模型并进行了再生过程动态特性模拟研究,为其实际应用提供理论参考。通过比较含湿量、有效再生时间、再生率等指标,分析了高低太阳辐射场景下该除湿床的再生特性。结果表明,在相同的硅胶涂覆厚度下,高太阳辐射工况(平均654.0 W/m^(2))下除湿床的稳态含湿量低于低太阳辐射工况(平均305.4 W/m^(2))的稳态含湿量。太阳辐射强度对除湿床再生有强化作用,高太阳辐射工况下再生率为57.3%,高于低太阳辐射工况下的再生率52.6%。高太阳辐射工况下,再生过程前3 h内再生量平均为8.31 g,随后的3 h内再生量平均仅有0.30 g,这表明天气良好的情况下3 h基本可以完成除湿床的再生。

Human comfort and health are significantly affected by indoor humid environments.Traditional dehumidification methods in buildings often have the problems of high energy consumption,complex structures,and high maintenance costs.Given this,a ventilated roof desiccant bed was proposed in this paper.The heat and moisture transfer process during its regeneration phase was analyzed,a dynamic numerical model for heat and mass transfer was established,and a dynamic characteristics simulation study of the regeneration process was conducted,providing theoretical reference for its practical application.By comparing indicators such as moisture content,effective regeneration time,and regeneration rate,the regeneration characteristics of the desiccant bed under high and low solar radiation scenarios were analyzed.The results indicate that,under the same thickness of silica gel coating,the steady-state moisture content of the desiccant bed under high solar radiation conditions(average 654.0 W/m^(2))is lower than that under low solar radiation conditions(average 305.4 W/m^(2)).The intensity of solar radiation enhances the regeneration of the desiccant bed,with a regeneration rate of 57.3%under high solar radiation conditions,higher than 52.6%under low solar radiation conditions.Under high solar radiation conditions,the average regeneration amount within the first 3 hours is 8.31 g,and only 0.30 g in the subsequent 3 hours,indicating that the regeneration of the desiccant bed can be basically completed within 3 hours in good weather.