Abstract
In order to make it possible to measure the clo value in various postures, we are studying the measurement method using the human body. Our previous researches showed that clo value measured with the human body is less than that measured with a “constant temperature control”-type thermal manikin. In our previous experiments, human body changes its skin temperature in response to the amount of clothing or changes in the temperature to maintain heat loss, while a “constant temperature control”-type thermal manikin changes its heat loss in response to the temperature or amount of clothing. Human body reaction is similar to “constant heat dissipation” -type thermal manikin. In order to improve the clo value measurement method using the human body, clo value of same clothing by thermal manikin which changed control method to “constant temperature” and “constant heat dissipation” were measured. Relational expressions of thermal insulation of clothes measured by different control methods were shown.
Highlights
Background and purpose of study1.1 Necessity of clo value of different postureClo value is one of the six factors of thermal environment, along with air temperature, humidity, airflow, radiation and metabolic rate, and it is very important for thermal environment assessment
It is inevitable that clo values measured using a human body exhibiting body temperature adjustment are lower than those measured using a “constant temperature control”-type thermal manikin
The surface temperature of the constant temperature thermal manikin remained almost constant at the set temperature of 33°C, regardless of the amount of clothing and the room temperature
Summary
1.1 Necessity of clo value of different posture. Clo value is one of the six factors of thermal environment, along with air temperature, humidity, airflow, radiation and metabolic rate, and it is very important for thermal environment assessment. Clo value is largely determined by heat resistance of the air among the fibers of clothes and the air beneath clothes. The thickness of the air layer underneath the clothes changes depending on the posture. Our previous studies [1,2,3] have reported that clo value differs depending on the posture. Japanese people do sit on chairs at home but adopt various postures such as sitting cross-legged on the floor. The knowledge of clo value for different postures is essential for the assessment of thermal environment of Japanese houses
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