Energy-efficient sorption-based gas clothes dryer systems

Ahmadi Masoud; Gluesenkamp Kyle R.; Bigham Sajjad

摘要

Standard electric resistance and fuel-driven dehydration technologies exhibit a maximum coefficient of performance of well below 1 mainly due to enthalpy losses associated with the air leaving the dehydration system. To improve energy efficiency, condensing dryer systems condense the moisture captured from a product in a closed loop air circulation cycle. Existing condensing dehydration systems including heat pump dryers, however, need to significantly cool the air to achieve dehumidification. The added cooling and subsequent heating to return the air to a desired drying temperature consume substantial energy and thus reduce drying performance. Here, an innovative sorption-based gas dehydration system is proposed to overcome barriers deteriorating energy efficiency in existing gas, electric, or heat pump dryer systems. Decoupling latent and sensible loads, the system employs a liquid-desiccant solution to directly capture air humidity, thereby allowing circulation of the air in a closed loop to achieve high drying energy efficiency. In other words, the system captures waste latent heat from the moisture produced during the dehydration process and reuses it to improve energy efficiency. This study focuses on a comprehensive quasi-steady-state thermodynamic modeling of the proposed sorption-based dehydration concept employed for a gas clothes dryer application to predict transient response and overall drying performance (i.e., time and energy metrics). The analysis indicates the proposed sorption-based gas clothes dryer system can deliver a specific moisture extraction rate of 1.71 kg of water per kWh (i.e., a combined energy factor of 3.167 kg (6.98 lbm) of dry cloth per kWh) with a drying time of 44 min. This is a 112% energy improvement compared with state-of-the-art gas clothes dryers exhibiting a combined energy factor of 1.50 kg (3.3 lbm) of dry cloth per kWh. The technology pursued here can potentially be employed as a platform for many fuel-driven equipment to take advantage of available waste thermal energy in the environment instead of simply burning a fuel.

机译：标准电阻和燃料驱动的脱水技术表现出良好的良好性能系数，主要是由于与脱水系统相关的空气相关的焓损失。为了提高能量效率，冷凝干燥系统将从产品中捕获的水分压缩在闭环空气循环循环中。然而，包括热泵干燥器的现有冷凝脱水系统需要显着冷却空气以实现除湿。添加的冷却和随后的加热以将空气返回到所需的干燥温度消耗大量能量，从而降低干燥性能。在此，提出了一种创新的基于吸附的气体脱水系统，以克服现有气体，电动或热泵干燥系统中的能量效率恶化的障碍。去耦潜伏和明智的载荷，该系统采用液体干燥剂溶液直接捕获空气湿度，从而允许空气循环在闭环中以实现高干燥能效。换句话说，该系统从脱水过程中产生的水分捕获废物潜热，并重新使用以提高能量效率。本研究侧重于综合对准稳态热力学建模的拟议的基于吸附的脱水概念，用于燃气干衣机应用，以预测瞬态响应和整体干燥性能（即时间和能量度量）。该分析表明，所提出的吸附剂型气体烘干机系统可以每千瓦时提供1.71千克水的特定水分提取率（即，每千瓦时的干布为3.167kbm（6.98磅）的组合能源因子），干燥时间44分钟。与最先进的气体烘干机相比，这是112％的能量改进，其每千瓦时展出1.50千克（3.3LBm）干布的组合能源因子。这里追求的技术可能是许多燃料驱动设备的平台，以利用环境中可用的废热能量而不是简单地燃烧燃料。

Energy-efficient sorption-based gas clothes dryer systems

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