Open AccessStudy on human responses under different CO2 concentration and illuminance in underground refuge chamber
Author(s) -
Zhijun Tu,
Geng Song,
Yong Li
Publication year - 2020
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/510/5/052026
Subject(s) - illuminance , daylight , human health , ventilation (architecture) , chemistry , environmental science , zoology , medicine , optics , physics , biology , meteorology , environmental health
Due to insufficient ventilation and absence of daylight, underground confined environment will be dim and occurred with high CO 2 concentration. It is essential to clarify the combined effects of high CO 2 concentration and illuminance on human responses in confined spaces. Twenty-four subjects were exposed to different combinations of illuminance and CO 2 concentrations in an underground climate chamber, with thermal responses, physiological responses and acute health symptoms being investigated. Results show that: at CO 2 level of 12,000ppm, heart rate (HR), diastolic blood pressure (DBP) and ratings of acute health symptoms (dizziness, agitation and depression) increased significantly when illuminance level was up to 500 lux. However, no similar results were observed at a CO 2 concentration of 8000 ppm. Additionally, thermal sensation votes (TSV) increased significant with increasing illuminance level, regardless of CO 2 concentration being 8000 or 12,000 ppm. Similar result was obtained for the change of thermal comfort votes (TCV) at CO 2 level of 12,000 ppm. However, TCV result for illuminance level of 100 and 500 lux did not show a significant difference at CO 2 concentration of 8000 ppm. This indicated that the combined effects of illuminance and high CO 2 concentration lead to different human responses.