Composite design and thermal comfort evaluation of safety helmet with phase change materials cooling

Abstract

Higher temperature and humidity will adversely affect the thermal comfort of helmet users. In order to improve the comfort level of the helmet and obtain an optimal cooling helmet model, four kinds of helmet models were established by using phase-change material (PCM) heat-absorbing cooling technology and fan cooling technology. Through the air conditioning system, the working states of four kinds of helmet models in the thermal environment of 30? were simulated, and the thermal comfort of four kinds of helmet models was evaluated. The results show that: high temperature environment is an important factor affecting the cooling effect of fan helmet (b) fan, Under high temperature environment, the helmet with fan cooling technology has a certain cooling effect in the early stage, but after 30 minutes, the cooling effect becomes worse and worse. Under high temperature environment, PCM safety helmet (c) has a good cooling effect, but poor ventilation results in the excreted sweat clinging to the scalp and hair, resulting in a poor user experience. There are defects in using phase-change material (PCM) heat absorption cooling technology or fan cooling technology alone. The helmet (d) combines PCM heat absorption cooling technology with fan cooling technology, so that the cooling effect and internal thermal environment stability of the helmet are the best, and the thermal sensation of human body is the best. Therefore, the helmet (d) is an optimal design model.

Peltier Elements-based Human Brain Hypothermia Treatment

“…The practical results were conducted within a climatic environment where the temperature of 30°C decreased when wearing the helmet and jacket to 22°C. Hu et al [26] suggested a cooling helmet dedicated to the head. The study's objectives were to design a cooling helmet suitable for workers and people.…”

Design and thermal performance evaluation of a new solar air collector with comprehensive consideration of five factors of phase‐change materials

“…PCMs have thermal characteristics of heat absorption at high temperature and heat release at low temperature 15 . Accordingly, PCMs have been widely used for building heating, 16 solar energy utilization, 17 and agricultural production 18 .…”

“…PCMs have thermal characteristics of heat absorption at high temperature and heat release at low temperature. 15 Accordingly, PCMs have been widely used for building heating, 16 solar energy utilization, 17 and agricultural production. 18 Some scholars have attempted to combine PCMs with solar air collectors and use the thermal characteristics of PCMs to carry out heat peak migration aimed at ultimately extending the heat release time of solar air collectors to meet the building users' continuous heating needs.…”

Phase change material for football helmet cooling system

“…Helmet cooling with PCM is widely considered as an inexpensive, compact, reliable and simple solution to implement [15,16,17,18,19].…”

“…Many researchers have investigated the effectiveness of using PCM cooling techniques for motorcycle helmets, safety, and construction helmets [15,16,17,18,19]. But there is not much literature on using PCM cooling techniques for football helmets.…”