Performance Study Of Energy Supply System Combined With The New Rural Green Building

With the quickening of urbanization in our country, rural high energy consumption, the low level of indoor thermal comfort, low utilization of rural renewable energy resources, all these are facing severe challenges. On the other hand, existing the integration of renewable energy technology and rural construction application is limited caused by many problems. Therefore, a new type of renewable energy technology which is advanced, applicable, available integration with rural construction, and can meet the demands of farmers’multi-level that is significant. The topic main research contents and results are as follows:(1) Constructed a set of energy supply system combined with the new rural green building. Combined with farmers’living habits, use solar energy and biomass as energy input to built a set of energy supply system which combined with a30m2new rural green building. The energy supply system can efficiently and cost-effectively meet the demand of farmers’living hot water, gas and heating energy.(2) The key factors effected on system performance. By multiple variable regression analysis it is concluded that the ambient temperature, the amount of dust and solar collector sets daily heat effect on the relatively average daily efficiency. In Summer, the ambient temperature increases1℃, the relatively average daily efficiency increases0.003on average; the amount of dust increase1g, the relatively average daily efficiency reduces0.013on average; the solar collector sets daily heat increases1MJ, the relatively average daily efficiency increases0.003on average. In winter, the ambient temperature increases1℃, the relatively average daily efficiency increases0.006on average; the amount of dust increase1g, the relatively average daily efficiency reduces0.146on average; the solar collector sets daily heat increases1MJ, the relatively d average aily efficiency increase0.002on average. The amount of dust influence on the relatively average daily efficiency is greater than the others and the influence of the amount of dust in winter is more significantly than in summer. Hot water lasted four days in the solar water heater tank under winter condition, compared with having dust in the collector’s surface, the hot water temperature of dust free is higher14.5℃than the having one.(3) Studied on the thermostatic digester temperature-controlled by solar energy’s production gas performance. During the winter test cycle, the lowest ambient temperature is-19.9℃, the fermentation temperature in digester is still26-27℃, the average content of CH4is50.8%and the average daily biogas production is1.400m3. Therefore, when the ambient temperature is close to-20℃under extreme conditions, the thermostatic digester temperature-controlled by solar energy can still continuous and stable production biogas. By multiple variable regression analysis it is concluded that the hot water temperature, the fermentation temperature in digester and the ambient temperature effect on the biogas production. The hot water temperature increases1℃, the biogas production increases0.055m3on average. The fermentation temperature in digester increases1℃, the biogas production increases0.163m3on average. The ambient temperature increases1℃, the biogas production increases0.071m3on average.(4) Economic benefit assessment of energy supply system combined with the new rural green building. Compared with the traditional rural building, the new rural green building saves2.2tons of standard coal and RMB￥3186every year, reduces emission8.1tons of carbon dioxide, the payback period of investment of the enforced cost is5.9years.The innovation of subject lies in:built a set of energy supply system combined with a new rural green building and studied the key factors effected on system performance.