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Indexed by:会议论文

Date of Publication:2009-01-01

Included Journals:EI、CPCI-S、Scopus

Volume:2

Page Number:833-840

Key Words:Local Thermal Sensation; Non-uniform environment; Weighting factor

Abstract:With the growth of building energy consumption, new approaches to improve thermal comfort have been constantly proposed, such as floor air supply system, task-ambient air conditioning, etc, whose applications also resulted in non-uniform indoor thermal environments. Therefore, research on non-uniform thermal environment not only has strong application significance, but also can reveal the principles of human thermal responses. Through subjective survey, explorative investigations on human responses are performed when single body part is thermally stimulated. Cooling airflow is sent to 7 body parts respectively. Overall 93 samples are tested. Because of the obvious multicollinearity of thermal sensation among body parts, principal component regression approach is proposed for the first time, so as to obtain principal components under different experimental conditions. By regression and analysis of principal components, weighting factors of the 7 body parts are gained. The results show that weighting factors are unaffected by ambient or local air temperatures. However, different characteristics of trunk and limb are clearly seen. Prediction model on overall thermal sensation is obtained based on the weighting factors. Excellent agreement is shown between predictions and measurement. The model shows that the weighting factors of local thermal sensation on the overall thermal sensation are fixed values, and little difference is among the values of different body parts.