여름철/겨울철 실내 표준온도에서 다양한 시트 조건에 따른 온열감성 조사

Abstract

This paper evaluates the thermal sensitivity through the investigation of objective indicators such as brain wave(EEG), pulse waves(PPG), and skin temperature as well as subjective surveyings such as thermal sensation vote (TSV), comfort sensation vote(CSV), concentration level vote(CLV) under various rest conditions standard and extreme temperature conditions during summer/winter. When comparing the results of brain waves, pulse waves, skin surface temperature, subject survey, and concentration level during summer, the use of cold water cooling seats activated Theta and Alpha waves as the brian waves of subjects. The use of the cold water cooling seat was also provided the comfort resting conditions in consideration of analysis result of LF/HF and stress, increasing SDNN, RMSSD, and survey of subjective questions. Therefore, the use of cold water cooling seat, which can provide direct local cold heat transfer rather than air ventilation seat using indoor air, is judged to be a more desirable way to provide a stable rest environment for the subjects. When comparing the results of brain waves, pulse waves, skin surface temperature, subject survey, and concentration level during winter, the use of hot water heating seat during resting provided a stable rest environment for the subjects through activation of Theta wave and reduction of LF/HF. However, the stress index showed a slight increase in the use of electric heating seat and hot water heating seat compared to that using the basic seat. It is judged that local direct hot heat transfer provided hot condition to subjects, thus the subject's stress index increased slightly. As a result of the subject questionnaires, the use of the electric heating seat and hot water heating seat provided an appropriately pleasant environment to the subjects. In addition, the result of analysis of attention concentration test showed high concentration level when using the electric heating seat. In this study, the thermal sensitivity was evaluated through subjective and objective analysis under various rest conditions in summer and winter, and the stability condition according to the rest method was defined by attention concentration test after a short break. This study can contribute to make an effective rest environment to the men during learning, driving and work.