Introduction to the study of warmer dummy and protective clothing comfort, safety evaluation

The protective clothing consists of a particular material compared to ordinary clothing, and its fastening system has innovative, and the design of protective clothing is unique. Evaluating the comfort and use performance of the protective clothing system is of great significance, and more and more standard test methods use a warm body fake person who is as large as the real person to test the performance of the protective clothing system. Thermostat dummy is used to evaluate fire resistance and sealing of different types of protective clothing. 1-5 In addition, the warm body dummy is also used to evaluate the effectiveness of the individual liquid cooling suit and protective clothing. 6 Heaters have been used by many researchers to measure thermal resistance of clothing systems and evaporation impedance. These two resistance values are used to predict the biophysical model of thermal comfort or thermal stress when wearer engaged in a particular environment. The nearest development trend of the warm body dummy focuses on the simulated human body specific heating site, such as head, hand, foot, calf, etc. to more accurately evaluate the thermal efficiency of helmets, gloves or even finger gloves and footwear materials. 7 It is worth mentioning that the warmers do not simulate the human body with physiological significance, it is a thermal metering device, its body size and shape are similar to ordinary people, and after heating, the body surface temperature simulates local and average of the human body Surface temperature, but they don't respond to the changes in the environment or clothing like human beings. This paper first classizes the warm body dummy; secondly, the thermal resistance and evaporation impedance of the protective clothing are measured based on the warm clothing, respectively, to characterize the comfort and safety of the protective clothing.

1 Warm fake person's classification of warm body dummy can be divided into two categories:

1.1 Multi-segment heating fake people

Most hemoon dummy composed of multi-segments that are controlled by temperature and measurement systems (although their purpose is to quantify the whole Conversion performance), the surface temperature of all segments can be controlled at the same temperature level (34 ° C), or the surface temperature of the segment is different, the temperature of the limbs is lower than the head and the torso. This warm body dummy can give relative thermal losses of each segment under certain environmental conditions, measuring the thermal resistance value of each segment and evaporation impedance value. However, most of the multi-segment heating fake people have internal heat transfer from a certain segment to another, and there is heat through the segments in the clothing layer (these will affect the accuracy of local resistance). . In addition, for multi-section warp fake people, there have been two different methods of calculating the thermal resistance of clothing: 1 overall method. First, the heat loss of each segment is first, and each segment body surface temperature is weighted, each segment surface area is sumued, and then the total thermal resistance of the garment is calculated.

2 Local Method. First calculate the thermal resistance of each segment of the clothing, and then weighted the total thermal resistance of the garment according to the body surface area of each segment of the warmer dummy. 7 The local method often gives a higher thermal resistance, since the thermal resistance distribution of the clothing is uneven, the thermal resistance obtained by local method is large. 8-9 When a certain sectionSegment, such as the abdomen, relatively hot in addition to other segments, the heat loss will be low or close to zero, resulting in too high of the measured partial thermal resistance, then the total thermal resistance of the local method is high.