Application And Research Of Clean Energy In North Farmhouse Under Energy Saving Reform

The poor thermal performance of rural buildings and the serious pollution of bulk coal combustion is practical problems that are eagerly resolved.The poor thermal performance of rural buildings and the serious pollution of bulk coal combustion is practical problems that are eagerly resolved.To solve these two problems,this paper analyzes the present situation of rural building envelope structures and the common heating methods for farmers in northern China.It was found that the enclosure structure of most rural houses did not adopt insulation measures and required energy conservation.Heating systems commonly used by rural households include coal stoves,condolences,soil heating,etc,and some of the more affluent villages use a centralized heating system for biogas or straw gasification.These systems still have various problems to be improved.In order to improve the thermal performance of farmer households,atypical farmer in Xiaoyi County,Shanxi Province,is measured for the thermal performance of the building envelope and made energy-saving improvements.Before the energy-saving transformation,the typical farmer was simulated and analyzed with EnergyPlus software.The result show that the transformation could save 60% of heating energy.Before the energy-saving transformation,the actual measured values of the heat transfer coefficients of walls,windows,and roofs were 2.3 times,1.43 times,and 2.11 times of the national requirements limit,respectively.And the actual measured values of the heat transfer coefficients of walls,windows,and roofs after energy saving decreased by72.7%,61.59%,and 64.99%.After the energy-saving renovation,the performance of each envelope structure can meet the requirements of the country.The actual statistics of the unit temperature difference before and after the transformation of biomass fuel consumption saved 66.74%,indicating that the energy-saving reformation has achieved very good results,and the accuracy of the EnergyPlus model.In order to resolve the serious pollution problem of bulk coal burning,the clean energy heating system is put forward in actual comparison operation and simulation.The heating system of the biomass solid fuel stove and the traditional small-scale coal-fired boiler has actually operated after the above-mentioned typical farmers have been transformed.EnergyPlus was used to simulate and analyze heating system combined by the biomass and solar in the other typical farmer house in Lvliang.In terms of thermal comfort,thebiomass solid-molding fuel furnace single operating system and the solar and biomass combined heating system have indoor average temperatures of 17.39℃and 17.18℃,respectively;PMV values are always within ±0.5;PPD values means that more than 90% of people are satisfied with thermal comfort.Although the indoor average temperature can reach the design temperature of14.52 ℃,the amplitude of coal-fired boiler system is so large that the coldest temperature can be as low as 10.36℃.At this point,the PMV value is-1.18,and37% of the people are not satisfied with the thermal environment.It recommends that the relevant specifications should increase the calculated northern rural residential interior design temperature from 14℃ to 16℃.In terms of economy,the annual cost of biomass solid fuel stove heating system is the smallest,which is 2079.39 yuan,followed by coal-fired boilers,2543.80 yuan.The annual value of the joint heating system is the highest,ranging from2432 yuan to 3255 yuan,while its operating cost is 1023 yuan.If government subsidizes the joint heating system,it would be better promoted.In terms of environmental protection,the joint heating system is the best and the coal-fired boiler is the worst.In summary,the biomass solid fuel stove is suitable for promotion in northern rural areas,and the biomass and solar energy combined heating system is suitable for promotion in richer northern rural areas.This article provides corresponding reference data for energy-saving reconstruction and clean heating reform of northern rural households.