Empirical correlations to predict the performance of the dehumidifier using liquid desiccant in heat and mass transfer
Empirical correlations to predict the performance of the dehumidifier using liquid desiccant in heat and mass transfer
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DOI：
10.1016/j.renene.2005.08.029
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发表时间：
2006-08
期刊：
影响因子：
8.7
通讯作者：
X. Liu;K. Qu;Y. Jiang
中科院分区：
文献类型：
--
作者：
X. Liu;K. Qu;Y. Jiang
除湿器是液体除湿空调系统的重要部件之一，需要其每小时的性能来预测系统的年能耗。模型复杂性和所需的计算机时间通常不允许使用基于微分元素的模型。为了估计除湿机的逐小时性能，本研究提出了一种简化方法，其中采用焓和湿效率作为描述除湿机传热传质性能的指标。根据相应的实验结果，通过焓差、湿度差、空气和干燥剂流量来表达焓和湿度有效性的经验相关性。给出了横流式填料除湿机的经验相关性，计算值与实验结果之间的平均绝对差值分别为6.3%和6.0%，其中热效率和湿效率的差异主要在±20%以内。文献中提供的逆流除湿机也显示出良好的一致性。
Dehumidifier is one of the essential components in liquid desiccant air-conditioning system, whose hourly performance is required to predict the annual energy consumption of the system. Model complexity and the required amount of computer time usually do not permit the use of models based on a differential element. In order to estimate the hour-by-hour performance of dehumidifier, a simplified approach is proposed in the present study, in which enthalpy and moisture effectiveness are adopted as indexes to describe the heat and mass transfer performances of the dehumidifier. Empirical correlations of enthalpy and moisture effectiveness are expressed by enthalpy difference, moisture difference, air and desiccant flow rate, based on corresponding experimental results. Empirical correlations are given for a cross-flow packed dehumidifier, the average absolute differences between the calculated values and the experimental findings are 6.3% and 6.0% for enthalpy effectiveness and moisture effectiveness, respectively, with discrepancies mainly within ±20%. Good agreements are also shown for counter-flow dehumidifiers available in literatures.