Research On Evaluation Index Of "Physiologically Adjustable Area"

With the improvement of living standards,more and more people are pursuing the thermal comfort of the indoor environment,and people are overly dependent on the comfortable environment created by the technology of heating and cooling.Therefore,the domestic and foreign scholars of HVAC and related fields have gradually focused on the thermal comfort and thermal neutrality of the building environment.However,while people focus on thermal comfort,there are few studies on the positive effects of their physiological functions on the environment.The function of the body’s thermal physiological regulation is negligible in the comfort area and dominates the discomfort area.Thus there should be an area which is psychologically acceptable and where human thermal regulation functions appropriately during the transition from comfort to discomfort.And this area is named"physiological adjustable area"in this article.It is not a medical concept,but a control range of the thermal environment parameters related to physiological adjustment and psychological adaptation.Since the"physiological adjustable area"is a cross boundary area between comfort and discomfort,the existing evaluation indicators should not be used directly in the region.Therefore,the focus of this paper is to explore the coupling relationship between the parameters of the indoor thermal environment,and its influence on psychological subjective evaluation and physiological objective adjustment.Through the combination of theoretical equation and experimental test,the empirical formula is obtained and the indexes suitable for the evaluation of thermal environment in this area are formed.Through theoretical analysis,the relationship between human heat load(TL)and environmental parameters is obtained,and Predictive Satisfaction Vote(PSV)is proposed as an evaluation index of"physiological adjustable area".Because human body heat load TL reacts the degree of human deviation from comfort,it is assumed that there is a function relationship PSV=f(TL)between PSV and TL.The TL was determined through the environmental parameters set in the experimental conditions,and the satisfaction voting of the experimental conditions was obtained by subjective questionnaire.The empirical formula was obtained by mathematical method.In the experimental design,9 working conditions are selected in summer,and 10working conditions are selected in winter.The experimental data were analyzed by ORIGIN85,SPSS21.0 and EXCEL2013,and the following conclusions were obtained.(1)With the change of environmental parameters,there is significant difference in satisfaction voting.Satisfaction voting is reasonable in the"physiological adjustable area",which is a small cross border area.(2)The thermal load of human body is edited by MATLAB software,and the environment parameters and human parameters are replaced by the set working conditions,and the heat load of the human body is obtained.Fitting satisfaction voting and TL,and the fitting formula of the two seasons of winter and summer were:Y=4.64+3.19X,R~2=0.96,Y=5.45+3.79X,R~2=0.99.It is found that the satisfaction vote has a strong correlation with the heat load of the human body.(3)The body’s sense of cold and hot stimulation is asymmetrical.Thus the winter and summer heat load and human satisfaction fitted different formula,and get the two seasons of winter and summer forecast satisfaction assessment results.The effectiveness of Predictive Satisfaction Vote in the non-heating-air-conditioning building environment is tested.The measured and predicted satisfaction of the winter and summer seasons are different in the non-air-conditioned building environment.Therefore,it is concluded that PSV does not apply to the natural ventilation building environment.It is only applicable to the air-conditioning or heating building environment.And it is only applicable to the human body heat load range of 5.45 to 17.26 W/m~2.