内部冷却干燥剂轮的性能研究,Applied Energy

干燥剂轮通常用于对空调系统中的空气进行除湿以减少能耗。这项研究的目的是设计，测试和分析新型管壳式内部水冷式干燥剂轮的性能。新车轮的供应部分使用了冷却水，以将除湿过程从几乎绝热转变为几乎等温。我们进行了一系列实验以研究车轮的性能，并使用实验结果验证了数学模型。然后将该模型用于研究修改对基础设计的影响，包括更改热交换管内干燥剂层的数量以及管的尺寸和数量。我们还分析了水温和流速对车轮除湿和温度升高的影响。我们的结果表明，仅在换热管内不超过两个干燥剂层的情况下，即可实现等温除湿性能。更多的层减少了最内层的空气与冷却水之间的热传递。较低的冷却水入口温度导致较低的空气出口湿度和温度。对于入口温度为30°C，绝对湿度为16.3 g / kg的工艺空气和入口温度为50°C，绝对湿度为16.3 g的再生空气，要达到等温除湿，需要约24°C的冷却水温度/公斤。

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Desiccant wheels are commonly used to dehumidify air in air-conditioning system to reduce the energy consumption. The objective of this study was to design, test and analyse the performance of a novel tube-shell, internally water-cooled desiccant wheel. Cooling water was used in the supply section of the new wheel to shift the dehumidification process from nearly adiabatic to nearly isothermal. We conducted a series of experiments to investigate the wheel’s performance and used the experimental results to validate a mathematical model. The model was then applied to investigate the influence of modifications to the base design, including changing the number of desiccant layers inside the heat-exchange tubes, and the size and number of tubes. We also analysed the influence of water temperature and flow rate on both dehumidification and temperature rise across the wheel. Our results show that isothermal dehumidification performance can be achieved, but only with no more than two desiccant layers inside the heat-exchange tubes. More layers reduced heat transfer between the air in the innermost layers and the cooling water. Lower cooling water inlet temperatures led to lower air outlet humidity and temperature. A cooling water temperature of approximately 24 °C was required to achieve isothermal dehumidification for process air with inlet temperature of 30 °C and absolute humidity of 16.3 g/kg and regeneration air with the inlet temperature of 50 °C and absolute humidity of 16.3 g/kg. This corresponds to a 48% improvement in dehumidification performance (the maximum absolute humidity change between inlet and outlet process air) compared with a conventional adiabatic desiccant wheel while using super-adsorbent polymer as the desiccant material.