A desiccant-enhanced evaporative air conditioner: Numerical model and experiments
A desiccant-enhanced evaporative air conditioner: Numerical model and experiments
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DOI：
10.1016/j.enconman.2012.08.007
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发表时间：
2013
影响因子：
10.4
通讯作者：
J. Woods;E. Kozubal
中科院分区：
文献类型：
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作者：
J. Woods;E. Kozubal
本文介绍了一种新型液体干燥剂空调的建模和实验结果，该空调由液体干燥剂除湿机和间接蒸发冷却器两级组成。每个级是通道对的堆叠，其中通道对是用薄塑料板与排气通道隔开的过程风道。在第一阶段，液体干燥剂薄膜排列在工艺空气通道上，通过多孔疏水膜从空气中除去水分。蒸发水膜润湿排气通道的表面并将液体干燥剂的蒸发焓转移到排气气流中，冷却干燥剂并使出口湿度降低。第二级是一个逆流间接蒸发冷却器，它虹吸并使用从第二级流出的一部分冷干空气作为蒸发汇。本文的目的是：(1)给出每个阶段的流体热数值模型，(2)给出每个阶段的原型实验结果，(3)比较模型和实验结果。在不同的入口温度和湿度、工艺和排气流量、干燥剂浓度和流量范围内，对原型机进行了多次实验。该模型预测实验误差在±10%以内。
This article presents modeling and experimental results on a recently proposed liquid desiccant air conditioner, which consists of two stages: a liquid desiccant dehumidifier and an indirect evaporative cooler. Each stage is a stack of channel pairs, where a channel pair is a process air channel separated from an exhaust air channel with a thin plastic plate. In the first stage, a liquid desiccant film, which lines the process air channels, removes moisture from the air through a porous hydrophobic membrane. An evaporating water film wets the surface of the exhaust channels and transfers the enthalpy of vaporization from the liquid desiccant into an exhaust airstream, cooling the desiccant and enabling lower outlet humidity. The second stage is a counterflow indirect evaporative cooler that siphons off and uses a portion of the cool-dry air exiting the second stage as the evaporative sink. The objectives of this article are to (1) present fluid-thermal numerical models for each stage, (2) present experimental results of prototypes for each stage, and (3) compare the modeled and experimental results. Several experiments were performed on the prototypes over a range of inlet temperatures and humidities, process and exhaust air flow rates, and desiccant concentrations and flow rates. The model predicts the experiments within ±10%.