Effect of cooling vest on heat and humidity transfer of stab-resistant body armor

Abstract

In order to quantitatively study the heat and moisture transfer performance of SRBA and improve the thermal comfort of SRBAꎬ a thermal manikin was used to measure and analyze thermal insulation and evaporative resistance of cooling vestꎬ SRBA and both stacks at different temperatures (25ꎬ 30ꎬ 40 °C) and humidity (40%ꎬ 55%ꎬ 70%). It is found that the thermal insulation changes at the three temperatures measured as SRBA> both stacks > cooling vestꎬ and the evaporative resistance follows this characteristic above 30 °Cꎬ that the higher the temperature isꎬ the greater the effect of the cooling vest on the heat transfer efficiency of the SRBA will beꎬ and that the thermal insulation can be reduced by up to 46􀆰 75% and the evaporative resistance can be reduced up to 82􀆰 97%. The results show that at higher ambient temperature ( > 30 °C)ꎬ the cooling vest can effectively reduce the thermal insulation and evaporative resistance of the SRBA and improve the heat and moisture transfer efficiencyꎬ and that the influence of the cooling vest on the heat and moisture transfer of the SRBA changes with the ambient temperatureꎬ humidity and design characteristics.