Research On The Heating Characteristics Of Farmhouses And Their Impact On Indoor Air Environment In The Miao Settlements In Guizhou

Located in a subtropical monsoon climate zone,Guizhou is a province with many ethnic groups.Among them,the total number of Miao people accounted for nearly half of the total number of Miao people in the country.Most of the Miao residents in Guizhou live in the Miao and Dong Autonomous Prefecture in Southeast Guizhou.Due to the clustering of residents and the relatively lagging local economic development,the traditional villages in the Miao settlements are relatively intact,and most of the residents still retain their traditional lifestyles.At present,the research on the settlements of the Miao people has attracted the attention of the government and many scholars,but most of them are carried out from the direction of architecture,art,tourism,etc.,and there are few researches on heating characteristics and indoor air environment.Based on the Miao ethnic settlements in Guizhou,this paper selects a typical traditional village in Danzhai County,Qiandongnan Miao and Dong Autonomous Prefecture,in a typical Miao settlement area as the research object,investigates the heating characteristics and indoor air environment of farm houses in Miao settlements,and analyzes local farm houses in the heating season.The characteristics of indoor air environment,explore the impact of different local farm house heating methods on the indoor air environment,and provide data foundation and technological support for heating improvement in Miao settlements.The first part is the heating characteristics and the status quo of indoor air environment.On the one hand,we used questionnaire surveys to investigate 100 typical farm houses in Guizhou's Miao settlements,and analyzed the heating characteristics of local farm houses from the perspectives of heating methods,heating costs,thermal comfort,safety,and convenience.On the one hand,the indoor air environment of 100typical farm houses investigated by the actual on-site inspection.The results show that the heating methods commonly used in local farm houses are divided into three types:stove,brazier and electric stove.The stove is the heating method with the highest thermal comfort,and the electric stove is the heating method with the lowest heating cost,the most convenient and the safest.Among the 100 farm houses surveyed,93%of the farm houses had indoor PM_2.5 concentrations exceeding 0.035 mg/m³,and 73%of the farm houses had indoor TVOC concentrations exceeding 0.6 mg/m³.The second part is the influence of heating on the indoor air environment.From the aforementioned 100 typical farm houses,40 households were selected as the research objects to carry out indoor air environment detection before and during heating,and the air quality index method was used to evaluate the indoor air environment of local farm houses.The results show that the comprehensive index before heating is 1.57,indicating that the indoor air environment is level IV,and the comprehensive index during heating is 3.49,showing that the indoor air environment is level VI.The analysis of indoor air environment before and after heating under different heating methods found that the composite index of using stove,brazier,and electric stove increased by0.67,2.90,and 0.97,respectively.The above analysis shows that the heating of local farm houses has a significant impact on the indoor air environment.Among the three heating methods,the use of brazier heating has the most significant impact on the indoor air environment.The third part is the comprehensive evaluation of the heating methods of farm houses.Select indoor air environment,heating cost,thermal comfort,safety,convenience,etc.as evaluation indicators,combined with analytic hierarchy process to build a comprehensive evaluation system for heating methods.On this basis,the constructed evaluation system is used to comprehensively evaluate the three main heating methods in the survey area.The results show that the weight values of the stove,brazier,and electric stove are respectively 1.374,0.386,and 1.236,which are more suitable for local farm houses.The heating method is stove and electric stove.