Abstract This paper presents a framework of exergy analysis to evaluate the performance of the condensing dehumidification and the desiccant wheel dehumidification. The performance of two dehumidification methods are compared for pure dehumidification purposes based on proposed dehumidification systems that undertake only the latent load. An air-source heat pump is adopted in the dehumidification systems to serve as the cold and heat source. Based on thermodynamic perfectibility theory and the laboratory experiment of the desiccant wheel, the power requirements and exergy efficiency of the two dehumidification methods are analyzed and compared under 17 sets of operating conditions. The coefficient of performance of the heat pump in the condensing dehumidification system is 2–3 times higher than in conventional air-conditioning systems. Environmental factors that influence the performance of each dehumidification method are identified. The performance of condensing dehumidification is affected mostly by the humidity ratio of indoor air, whereas the outdoor air temperature has a minor impact. The humidity ratio difference between indoor and outdoor air is the most influential factor in the desiccant wheel dehumidification, followed by the outdoor air temperature. Under the operating conditions examined in the present study, the condensing dehumidification shows 3–4 times higher exergy efficiency than the desiccant wheel dehumidification. Therefore, the condensing dehumidification should be preferred over the desiccant wheel dehumidification for typical indoor dehumidification applications.

中文翻译：

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除湿系统的火用分析：冷凝除湿与除湿轮除湿的比较

摘要 本文提出了一个火用分析框架来评估冷凝除湿和干燥剂轮除湿的性能。基于仅承担潜在负荷的拟议除湿系统，比较两种除湿方法的性能以实现纯除湿目的。除湿系统采用空气源热泵作为冷热源。基于热力学完善性理论和除湿轮的室内实验，分析比较了两种除湿方式在17组工况下的功率需求和火用效率。冷凝除湿系统中热泵的性能系数比传统空调系统高2-3倍。确定了影响每种除湿方法性能的环境因素。冷凝除湿的性能主要受室内空气湿度比的影响，而室外空气温度的影响较小。室内外空气的湿度比差异是干燥剂轮除湿影响最大的因素，其次是室外空气温度。在本研究中检查的操作条件下，冷凝除湿显示出比干燥剂轮除湿高 3-4 倍的火用效率。因此，对于典型的室内除湿应用，冷凝除湿应优于干燥剂轮除湿。冷凝除湿的性能主要受室内空气湿度比的影响，而室外空气温度的影响较小。室内外空气的湿度比差异是干燥剂轮除湿影响最大的因素，其次是室外空气温度。在本研究中检查的操作条件下，冷凝除湿显示出比干燥剂轮除湿高 3-4 倍的火用效率。因此，对于典型的室内除湿应用，冷凝除湿应优于干燥剂轮除湿。冷凝除湿的性能主要受室内空气湿度比的影响，而室外空气温度的影响较小。室内外空气的湿度比差异是干燥剂轮除湿影响最大的因素，其次是室外空气温度。在本研究中检查的操作条件下，冷凝除湿显示出比干燥剂轮除湿高 3-4 倍的火用效率。因此，对于典型的室内除湿应用，冷凝除湿应优于干燥剂轮除湿。室内外空气的湿度比差异是干燥剂轮除湿影响最大的因素，其次是室外空气温度。在本研究中检查的操作条件下，冷凝除湿显示出比干燥剂轮除湿高 3-4 倍的火用效率。因此，对于典型的室内除湿应用，冷凝除湿应优于干燥剂轮除湿。室内外空气的湿度比差异是干燥剂轮除湿影响最大的因素，其次是室外空气温度。在本研究中检查的操作条件下，冷凝除湿显示出比干燥剂轮除湿高 3-4 倍的火用效率。因此，对于典型的室内除湿应用，冷凝除湿应优于干燥剂轮除湿。