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

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