4.5 Article

Evaluation of thermal and evaporative resistances in cricket helmets using a sweating manikin

期刊

APPLIED ERGONOMICS
卷 45, 期 2, 页码 300-307

出版社

ELSEVIER SCI LTD
DOI: 10.1016/j.apergo.2013.04.011

关键词

Sports helmet; Thermal comfort; Sweating manikin

资金

  1. Albion Hat and Cap Co. Pty. Ltd.

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The main objective of this study is to establish an approach for measuring the dry and evaporative heat dissipation cricket helmets. A range of cricket helmets has been tested using a sweating manikin within a controlled climatic chamber. The thermal manikin experiments were conducted in two stages, namely the (i) dry test and (ii) wet test. The ambient air temperature for the dry tests was controlled to similar to 23 degrees C, and the mean skin temperatures averaged similar to 35 degrees C. The thermal insulation value measured for the manikin with helmet ensemble ranged from 1.0 to 1.2 do. The results showed that among the five cricket helmets, the Masuri helmet offered slightly more thermal insulation while the Elite helmet offered the least. However, under the dry laboratory conditions and with minimal air movement (air velocity = 0.08 +/- 0.01 ms(-1)), small differences exist between the thermal resistance values for the tested helmets. The wet tests were conducted in an isothermal condition, with an ambient and skin mean temperatures averaged similar to 35 degrees C, the evaporative resistance, R-et, varied between 36 and 60 m(2) Pa W-1. These large variations in evaporative heat dissipation values are due to the presence of a thick layer of comfort lining in certain helmet designs. This finding suggests that the type and design of padding may influence the rate of evaporative heat dissipation from the head and face; hence the type of material and thickness of the padding is critical for the effectiveness of evaporative heat loss and comfort of the wearer. Issues for further investigations in field trials are discussed. (C) 2013 Elsevier Ltd and The Ergonomics Society. All rights reserved.

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