The effect of forced convection and PCM on helmets' thermal performance in hot and arid environments
المؤلف | Ghani, Saud |
المؤلف | ElBialy, Esmail Mohame Ali Ahmed |
المؤلف | Bakochristou, Foteini |
المؤلف | Mahmoud, Seifelislam |
المؤلف | Gamaledin, Ahmad |
المؤلف | Rashwan, Mohammed Mohammed |
تاريخ الإتاحة | 2021-02-08T09:14:54Z |
تاريخ النشر | 2017 |
اسم المنشور | Applied Thermal Engineering |
المصدر | Scopus |
الملخص | Safety helmets are essential Personal Protecting Equipment (PPE) in all industrial and construction sites. When temperature and humidity levels are high, users' thermal comfort is adversely affected. This paper examines the utilization of forced convection and Phase Changing Material (PCM) to control the thermal comfort of helmet users. An experimentally validated three-dimensional Computational Fluid Dynamics (CFD) model of an industrial helmet and a human head was utilized to assess the helmet thermal performance under different harsh working environments. The standard k-? turbulence model was used to investigate the helmet cooling performance and to assess the user's thermal comfort at different ambient conditions. Energy and mass conservation equations were implemented in the calculation. The effect of solar radiation, forced convection and PCM integration at different incident wind speeds on the helmet's thermal performance was assessed. The effect of sweating on mass and heat transfer of the modeled human head skin was examined. Results concluded that forced convection decreased the maximum temperature on the helmet outer surface by about 10 C. The PCM embedded in the helmet proved to prolong the thermal comfort period. Findings highlighted that the heat generated from the head is the dominant factor affecting the melting time of the PCM. |
راعي المشروع | This publication was made possible by the award [QUEX-CENG-ASPIRE-11/12-7] from the Aspire Zone Foundation, Doha, Qatar. The statements made herein are solely the responsibility of the authors. |
اللغة | en |
الناشر | Elsevier Ltd |
الموضوع | Cooled helmets and safety helmets Forced convection Phase Change Material (PCM) Thermal comfort |
النوع | Article |
الصفحات | 624-637 |
رقم المجلد | 111 |
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