Abstract

This work investigates the evenness of fabric drying in a household heat pump tumble dryer. The evenness of drying was defined as the standard deviation of the fraction of water, evaporated from each fabric item. Drying experiments were performed according to the IEC 61121 standard, which was also followed to determine quantities and types of cotton fabric items (towels, pillowcases and sheets) within each load. Regression analysis was performed to develop models for evenness of drying as a function of load mass and drum speed. Similarities between the tumble dryer energy efficiency parameters and the evenness of drying were analyzed. A high level of agreement was determined between responses of energy efficiency, drying time and evenness of drying to changes in drum speed. Effects of load mass were however more complex and were reflected in a non-linear response of evenness of drying to changes in load mass – the best evenness of drying could be obtained at 2 kg load, followed by 6 kg and 4 kg load. Load composition was determined as an important factor affecting the evenness of drying. At larger loads, a sheet or a pillowcase in average contributed more to the un-evenness of drying than a towel. The presence of sheets and probably the ratio of sheets to other item types in the load were determined as the most probable factors that negatively affected the evenness of drying.

摘要

这项工作调查了家用热泵滚筒烘干机中织物干燥的均匀度。干燥均匀度被定义为从每件织物中蒸发的水份的标准偏差。根据 IEC 61121 标准进行干燥实验，并确定每个负载中棉织物物品（毛巾、枕套和床单）的数量和类型。进行回归分析以开发作为负载质量和滚筒速度函数的干燥均匀度模型。分析了滚筒烘干机能效参数与烘干均匀度的相似性。在能量效率、干燥时间和干燥均匀度对滚筒速度变化的响应之间确定了高度的一致性。然而，负载质量的影响更为复杂，并反映在干燥均匀度对负载质量变化的非线性响应中——在 2 kg 负载下可以获得最佳干燥均匀度，其次是 6 kg 和 4 kg 负载。负载组成被确定为影响干燥均匀度的重要因素。在较大的负载下，平均而言，床单或枕套比毛巾更容易导致干燥不均匀。纸张的存在以及可能在负载中纸张与其他物品类型的比率被确定为对干燥均匀度产生负面影响的最可能的因素。在较大的负载下，平均而言，床单或枕套比毛巾更容易导致干燥不均匀。纸张的存在以及可能在负载中纸张与其他物品类型的比率被确定为对干燥均匀度产生负面影响的最可能的因素。在较大的负载下，平均而言，床单或枕套比毛巾更容易导致干燥不均匀。纸张的存在以及可能在负载中纸张与其他物品类型的比率被确定为对干燥均匀度产生负面影响的最可能的因素。