Optimization Experiment of PCM on Thermal Environment inside Safety Helmet

Abstract

In the process of physical state or molecular structure transformation, phase change materials can absorb the heat in the environment, and release the heat to the environment when necessary, so as to achieve the purpose of controlling the ambient temperature. Therefore, phase change materials are widely used in building energy saving, solar energy utilization, agricultural production and other fields. In this study, based on the thermal characteristics of phase change material (PCM) in high temperature and heat release in low temperature, four kinds of safety helmet models were established by using PCM patch. Through the air conditioning system, the working states of four kinds of helmet models in 30 ℃ and 16 ℃ thermal environments are simulated respectively. The temperature and humidity values of four kinds of safety cap models in different environments are measured by multi-channel temperature measuring instrument and temperature and humidity measuring instrument. Through comparative analysis: PCM Safety Helmet (c) has the effect of cooling and moisturizing at high temperature, and has the effect of thermal insulation at low temperature; in high temperature environment, the internal temperature of fan Safety Helmet (b) is higher, and the internal thermal environment is chaotic, so its cooling effect is poor; the cooling effect of Safety Helmet (d) in high temperature environment is not obvious.