Purpose

In the present work, the thermal insulation characteristics of multilayered mittens were studied in different airflow conditions.

Design/methodology/approach

In this study, the thermal behavior of four groups of mittens consisting of one two-layer and three three-layer mittens containing nonwoven wadding materials with various weights and thicknesses was investigated during the exposure to airflows with different speeds. In order to evaluate the correlation between the heat transfer rates of different mittens with the human perception of cold, a set of pair-comparison tests was performed using Thurstone's law of comparative judgment.

Findings

The analysis of the results revealed that by an increment in the weight and the thickness of the wadding material, the thermal protection performance of mittens improves. Moreover, in the presence of airflow and by increasing its speed, due to the forced convective heat loss, the outer surface temperature of the mittens decreases and therefore the conductive heat transfer rate rises. This fact leads to the transfer of higher quantity of body warmth to the environment and thus feeling of coldness. According to the results, there was a proper correlation between the subjective perception of cold and the heat transfer rate of mittens. The statistical analysis of the results clarified that the effect of mitten's structural parameters and the airflow speed on the thermal protection behavior of mittens are significant at the confidence range of 95%.

Originality/value

Mitten is one of the important personal protective clothing, especially in cold environments. Thus, the thermal resistance of them has a prominent role in the protection of the hands and fingers from cold and frostbiting.

中文翻译：

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考虑气流速度的多层手套的隔热性能评估

目的

在目前的工作中，研究了多层手套在不同气流条件下的隔热特性。

设计/方法/方法

在这项研究中，研究了四组连指手套在暴露于不同速度的气流期间的热行为，该四组连指手套由一层两层和三层三层连指手套组成，这些连指手套含有不同重量和厚度的无纺填料。为了评估不同手套的传热速率与人类对冷的感知之间的相关性，使用瑟斯通的比较判断定律进行了一组配对测试。

发现

结果分析表明，通过增加填充材料的重量和厚度，手套的隔热性能得以改善。此外，在气流的存在下并通过增加其速度，由于强制对流热损失，连指手套的外表面温度降低，因此导热率提高。这一事实导致大量的身体温暖转移到环境中，从而带来寒冷感。根据结果​​，对寒冷的主观感觉与手套的传热率之间存在适当的相关性。结果的统计分析表明，手套的结构参数和气流速度对手套的热保护行为的影响在置信度为95％时显着。

创意/价值

连指手套是重要的个人防护服之一，尤其是在寒冷的环境中。因此，它们的热阻在保护手和手指免受寒冷和冻伤方面具有重要作用。