Solid desiccant dehumidification systems offer an effective and energy-efficient alternative for deeply dehumidifying air. Desiccant coated heat exchangers (DCHEs), a type of solid desiccant dehumidification system, have garnered attention due to their ability to eliminate adsorption heat and thereby enhance dehumidification capacity, unlike desiccant wheels that perform adiabatic dehumidification. This study introduces a silica gel coated cross-flow DCHE equipped with a circulating blowing loop for deep dehumidification applications. A two-dimensional numerical model is developed to simulate deep dehumidification behavior of the DCHE. Parametric analysis is performed to explore the dehumidification characteristics under various conditions, setting different volume fractions ω of blowing loop air. Results indicate that the DCHE can effectively reduce the moisture content of humid air to a deep dehumidification threshold of 6.2 g/kg. Additionally, dehumidification capacity can be increased by incorporating a circulating blowing loop. The influence of process air velocity, cooling air velocity, process air humidity ratio, regeneration air temperature and air channel length on the dehumidification performance are analyzed, focusing on metrics such as minimum outlet air humidity ratio Ya1,ad,out_min, effective deep dehumidification time teff, moisture removal capacity MRC and dehumidification coefficient of performance DCOP. It is determined that the regeneration air temperature should be raised to 80 °C to ensure deep dehumidification, and an air channel length of 0.2 m is optimal.

中文翻译：

---

具有循环吹气回路的硅胶涂层错流换热器的深度除湿特性


固体吸附除湿系统为深度除湿空气提供了一种有效且节能的替代方案。干燥剂涂层换热器 （DCHE） 是一种固体干燥剂除湿系统，与执行绝热除湿的干燥剂轮不同，它们因其能够消除吸附热从而提高除湿能力而受到关注。本研究介绍了一种硅胶涂层的错流 DCHE，该 DCHE 配备了用于深度除湿应用的循环吹灰回路。开发了一个二维数值模型来模拟 DCHE 的深度除湿行为。进行参数分析以探索各种条件下的除湿特性，设置不同吹扫回路空气的体积分数 ω。结果表明，DCHE 可有效将潮湿空气中的水分含量降低至 6.2 g/kg 的深度除湿阈值。此外，可以通过加入循环吹灰回路来提高除湿能力。分析了工艺风速、冷却风速、工艺风湿度比、再生风温度和风道长度对除湿性能的影响，重点关注最小出口风湿度比 Ya1，ad，out_min、有效深度除湿时间 teff、除湿能力 MRC 和除湿性能系数 DCOP 等指标。确定再生空气温度应升高到 80 °C 以确保深度除湿，空气通道长度为 0.2 m 为最佳。