실내온도와 CO₂농도가 주관적반응과 작업수행도에 미치는영향

Influence of Indoor Temperature and CO₂ Level on Subjective Response and Work Performance

The purpose of this study was to investigate influence of indoor temperature and CO₂ level on occupants’ subjective response and work performance. A series of experiments were conducted at a controlled climate chamber. In the climate chamber, indoor temperature was controlled in three levels of 24℃, 26℃ and 28℃, and CO₂ concentration in two levels of low (under 1,000ppm) and high (over 1,000ppm). The levels were combined into six experimental conditions. Twelve female university students were selected as subjects among volunteers. During each of 40-minute experiment sessions in the climate chamber, the subjects were asked to fill out a questionnaire regarding subjective response and work performance. The questionnaire was developed by the preliminary experiment and the researcher based on existing studies. The questions on subjective response consisted of thermal sensation, evaluation on indoor temperature, humidity sensation and air quality sensation. The work performance questions included arrangement of syllable, arithmetic operation and figure matching. The results are summarized as follows. First, neutral point by thermal sensation was 26.9℃, and neutral point by evaluation on indoor temperature was 25.5℃. CO₂ level was found to have no significant influence on the subjects’ air quality sensation. It was found that there was no interaction effect of indoor temperature and CO₂ level on subjective responses. Second, the subjects tended to show the best work performance in arrangement of syllable and figure matching at 26℃ and in arithmetic operation at 24℃. Indoor temperature and work performance were found to have significant relationship. CO₂ level was found to have no influence on the subjects’ work performance. It was found that there was no interaction effect of indoor temperature and CO₂ level on work performance.