Thermal Comfort Comprehensive Evaluation And Application Based On The Physiological Parameters

Higher demand for health, comfortable indoor environment appears with thedevelopment of society, and energy consumption of air conditioner is also increasedyear by year. Therefore, researchers pay more attention to the evaluation of thermalcomfort indoor environment. In this thesis, thermal comfort evaluation and applicationwere researched based on body thermal response of physiological parameters (surfacetemperature and surface impedance).20young college students (male and female,10each) were the subjects in the artificial climate indoor experiment. Quantitative analysiswas made through a thermal comfort questionnaire survey on the basis of results gotfrom heat and moisture parameters of the environment, surface temperature and surfaceimpedance.The influences of environmental operation temperature Top on thermal comfort(psychology), surface temperature and surface impedance (physiological parameter)were analyzed.And then with a simple distance method, thermal comfort and sweatingsense in the partial thermal environment were discriminated utilizing the mean surfacetemperature and average surface impedance. Furthermore, a comprehensive evaluationof thermal comfort model was established in this paper with partial least-squareregression method and the corresponding thermal comfort comprehensive evaluationsoftware was developed.The research work of this dissertation can be summarized as follows:①The influence of the operation temperature Top on thermal comfort(psychology), surface temperature and surface impedance (physiological parameter)was studied.1) Operation temperature Top shows significant influence on subjective thermalsensation, thermal comfort and the vote for sweating sense, which has a good linearrelationship when Top is in [28.6，32.4]℃.2) Operation temperature Top shows a significant impact on surface temperature,and there is a good linear relationship when Top is in [26.7，30.5]℃. The rate ofincrease in surface temperature slows down when Top is over30.5℃due to sweating.3) The influence of operation temperature Top on surface impedance is significant,and there is a good linear relationship when Top is in [28.6.，32.4]℃, in respect that thesurface impedance decreases while operation temperature rises.4) The average surface temperature of the male students MST was higher than female under the same operation temperature, and this difference decreases with theincrease of the environmental operation temperature. When the environmental operationtemperature rises above30.5℃, this difference becomes very small and graduallydisappears.②Discrimination and analysis of thermal comfort were researched using DistanceDiscrimination method, which was based on surface temperature.In the relatively hot indoor environment, there are2thresholds among3thermalcomfort, the threshold between thermal neutral （I）and thermal comfort（II）is34.38℃; the threshold between thermal comfort （II） and thermal uncomfortableness （III）is34.83℃, which is the threshold between comfort and uncomfortableness as well.③A comprehensive evaluation of thermal comfort model was established in thispaper with partial least-square regression method.A comprehensive evaluation of thermal comfort model was established in thispaper with partial least-square regression method, when we considered that the impactof operation temperature Top, mean surface temperature MST, and mean surfaceimpedance MSI on thermal comfort is a typical multicollinearity problem. thermalsensation vote (TSV) can be better evaluated and predicted by using this model, andalso the influence factor of Top、MST and MSI on thermal sensation vote (TSV) can bereflected.④The development of thermal comfort evaluation software.The corresponding thermal comfort comprehensive evaluation software wasdeveloped, which greatly facilitated its practical application. Through the software, theenvironment operation temperature, the mean surface temperature MST, and the meansurface impedance MSI and so on can be easily computed, to make a comprehensiveevaluation on thermal comfort, which make convenience for the thermal comfortexperiments and theoretical analysis.