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Numerical and experimental performance analysis of rotary desiccant wheels

机译：旋转式干燥剂轮的数值和实验性能分析

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摘要

In air-conditioning field, a dehumidification has become increasingly important for human health and comfort especially in hot and humid climates. However, a conventional mechanical dehumidification with a vapor compression refrigerator has some problems. Therefore, much attention has been paid recently to a desiccant air-conditioning system as an alternative to the conventional system. In this paper, we focus on a rotary desiccant wheel which is the main component of the desiccant air-conditioning system and develop and validate the mathematical model by comparison with experimental results. The validation is conducted under various operating conditions. The mathematical model discussed in this paper includes, for example, the entrance region effect in air channel, detailed diffusion phenomenon in porous solid. In experiments, effects of the regeneration air temperature, air superficial velocity, wheel thickness and wheel rotational speed on the desiccant wheel performance are investigated. In addition, the temperature and humidity distribution at the outlet of the desiccant wheel are measured. As a result, an average relative error between the predicted and the measured humidity ratio difference distribution is 3.3% and temperature difference distribution 10.8%. Moreover, the effect of the regeneration air inlet temperature, the air superficial velocity, wheel thickness and wheel rotational speed on the desiccant wheel performance are clarified and the predicted results are totally in good agreement with the measured results.
机译：在空调领域，除湿对于人类健康和舒适性变得越来越重要，特别是在炎热和潮湿的气候下。然而，利用蒸气压缩式制冷机的常规机械除湿具有一些问题。因此，近来作为干燥剂空调系统的替代品，备受关注。在本文中，我们将重点放在作为干燥剂空调系统主要部件的旋转干燥剂轮上，并通过与实验结果进行比较来开发和验证数学模型。验证是在各种操作条件下进行的。本文讨论的数学模型包括，例如，空气通道中的入口区域效应，多孔固体中的详细扩散现象。在实验中，研究了再生空气温度，空气表观速度，车轮厚度和车轮转速对干燥剂车轮性能的影响。另外，还测量了干燥剂轮出口处的温度和湿度分布。结果，预测的和测量的湿度比差异分布之间的平均相对误差为3.3％，温度差异分布为10.8％。此外，阐明了再生空气入口温度，空气表观速度，轮厚和轮转速对干燥剂轮性能的影响，预测结果与实测结果完全吻合。

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