Study On Thermal Performance Of Active And Passive Combined Solar Greenhouse In Qinghai Province

With the continuous development of China's economy,urbanization rate increased year by year,energy consumption was a rapid upward trend.According to statistics,the current building energy consumption accounts for about one-third of the total energy consumption of society.Therefore,the development of more effective means of building energy efficiency is imperative.The solar energy as a renewable resource,and its combination with the building,to achieve the integration of solar energy building is an effective means of building energy efficiency.Qinghai Province is China's solar energy rich areas.Based on the combination of solar energy and the Kang body in the farmhouse of the region,the active heating system of solar Kang is formed and coupled with the Tromble wall and the direct benefit window solar passive heating technology to form a new type of solar heating system The Based on the application of solar energy,this paper has carried on the experimental test,the simulation research and the theoretical calculations to the main passive combined solar greenhouse.The main contents are as follows:First of all,for the solar Kang active heating technology and Tromble wall passive heating technology in the application of solar energy in the greenhouse,including solar Kang alone running at night,solar Kang night running and Tromble wall during the day running coupling,solar Kang and Tromble wall running during the day coupling,solar Kang alone running all day and set the Tromble wall alone during the day and other five models of the test program,and the five models of the test results include the average indoor temperature,Kang surface temperature and so on were analyzed and compared.The results show that the solar Kang all day operation and the Tromble wall during the daytime operation of the coupling mode,the best indoor heating effect,the average outdoor temperature of-13.39? case,the experimental room average temperature of 5.86 ? the highest The temperature can reach 14.04 °C,Kang surface temperature up to 34.20 ?,compared with the control,the average daily temperature is higher 8.35 ?.The results of the test provide a reference for energy efficiency analysis of solar greenhouse.Secondly,the corresponding numerical simulation model of the experimental room is established.The coupling model of the solar Kang running day and the Tromble wall is simulated,and the correctness of the numerical simulation model is verified according to the measured data.Then,the solar Kang was run separately,and the Tromble wall was run separately and the coupling model was simulated numerically.The influence of the solar Kang system and the Tromble wall system on the indoor thermal environment was analyzed by the simulation results of the temperature field.Thirdly,through the simulation,it can be seen that the indoor thermal environment is influenced by the solar Kang system and the Tromble wall system,and the heat transfer characteristics of the two are analyzed theoretically.Combined with the results of the analysis and experimental data show that solar Kang on the indoor radiation heat slightly more convection heat transfer.The heat transfer of the Tromble wall system to the indoor heat is greatly influenced by outdoor radiation.Based on the results of the calculation of heat transfer between solar Kang and Tromble wall,the optimal mode is that the solar Kang is running and the Tromble wall is operated in the daytime.In the same day,the solar energy can save the standard coal 2.725kg,can reduce the emissions of carbon dioxide 6.732kg,sulfur dioxide 0.055kg,dust 0.027kg,saving electricity 8.37 yuan,to achieve solar energy rate of 64.2%.