Thermal Comfort Study And Economic Analysis Based On Heating Assisted By Seat In Rural Area

In recent years,the "coal to electricity" project has been widely used in clean heating in northern rural areas.However,for rural families with weak economic conditions,the annual heating cost is still high,and the cost can only be reduced by reducing the indoor temperature.Therefore,auxiliary heating has become an effective means of heating in rural residential environment.In this paper,a low power seat auxiliary heating method is proposed,and its feasibility in rural areas is discussed by studying the thermal comfort of human body under this heating method.Specific research contents are as follows.(1)Under three experimental conditions of 14,16 and 18℃,selecting healthy university students,who are the subjects of male-female,through the questionnaire survey to obtain subjects’ local and overall thermal sensation,overall thermal comfort and thermal acceptability,at the same time record the body skin temperature,compared steady-state thermal response of the body before and after the seat heating.The experiment lasted for two months(from November 1 to December 31,2020).It was found that using seat heating in a cold environment can effectively improve the skin temperature and thermal sensation of various parts of the body,improve thermal comfort,reduce the dissatisfaction rate of thermal environment,and improve the human body’s adaptability to a cold environment.At the same time,it was found that the more the experimental environment temperature deviates from the comfortable environment,the more obvious the improvement of human thermal response.(2)According to the multicollinearity of thermal sensation in various parts of the human body,principal component analysis was used to carry out dimensionality reduction analysis,and the influence weight of thermal sensation in various parts of the body on the overall thermal sensation in seat heating in a cold environment was obtained.Found between human body and body weight of the thermal sensation,of which each part of the body(after forearm,arm,back,thigh,calf and foot)weight was relatively close to the influence of thermal sensation,forehead thermal sensation for a minimum proportion,back,hips and chest,the proportion of thermal sensation was opposite bigger.The thermal sensation of each part acted on the overall thermal sensation.(3)The relationship among the three thermal indexes of overall thermal sensation,thermal comfort and thermal acceptability was discussed.It was found that in a uniform thermal environment,the three indexes wree closely related,while in a non-uniform thermal environment,the thermal sensation was separated.The inhomogeneity of thermal sensation was the cause of this phenomenon.By introducing the average skin temperature and the overall thermal sensation for the fitting analysis,a comprehensive prediction and evaluation model combining the subjective thermal response and objective physiological indicators was obtained,which proved that the prediction effect was good(R2=0.903),and could be used to predict the thermal comfort of seat heating under steady condition.(4)Based on the research results of production and living and dress habits of the northern rural residents,took Liuduandi Village,Qingxu County,Taiyuan City as an example,to use the seat-assisted air source heat pump heating(indoor temperature setting for 14℃)with the separateair source heat pump heating(indoor temperature setting for urban residential heating standard 18℃),analysis was made on the economy,It was found that the seat-assisted air source heat pump heating method saved 28.4% energy and 28.9% operating cost compared with the air source heat pump heating method without auxiliary heating.