Study On Methods Of Building Integrated Solar Air Heating System Intelligent Operation And Optimization Of Tcm Thermal Mass

For a long time, room temperature instability has been a technical problem of restricting the promotion of passive solar building.Fully exploiting the limited solar resources, building highly efficient solar collection, storage and transmission systems, is an important way to improve the overall thermal performance of solar architecture. Solar collection, transport, storage are essential three parts of passive solar building, also has an interaction. For passive solar building, reasonable heat transport control strategy of the collector is the key to ensure an efficient comfortable indoor environment, the indoor air temperature changes along with out air temperature considering the building envelope thermal characteristics has crucial significance to determine adaptive control of collector coupled with thermal mass.In this paper, research about heat transfer and heat storage was carried out on a big enough experimental platform which can passively collect solar energy.In the experiment, a self-developed intelligent system was employed to control heat collectors and a new kind of material called TMC was employed to control temperature. According to the experiment, we build a physical model with EnergyPlus, and then analyzed the best working form of heat collectors coupling TCM. The conclusions have both theoretical significance and application value in improving the performance of passive solar buildings and generalizing solar buildings. The main contents and achievements are as follows:Firstly, under the different conditions of solar irradiance, the conclusion was drew that the function correlation between mass flow rate and temperature difference between inlet and outlet Based on the analysis of the function, the strategy of intelligent control was got:there is a critical solar irradiance of the heat collector, if the solar irradiance is higher than the criticality, the supplied heat Q is a increasing function of mass flow rate m, in this case, the fan should shift to its highest gear; on the contrary, there is a optimum value m to get the maximal Q, in this case, the fan gear should shift according to current heat supply until Q doesn’t change.Secondly, the visual experimental platform was employed to study the relationship between the speed of air which heat collector blow in and the efficient heat collecting space, the conclusion was drew that the efficient heat collecting space doesn’t depend linearly on the air speed and the air speed is4.3m/s based on the maximal efficient heat collecting space. Thirdly, through the experiment method, quantitatively and qualitatively analyze how TCM effect the thermal environment of passive solar building, the stability of the envelope, energy consumption of the building and thermal comfort, the results show that:while heating, the arrangement form of TCM has little effect on indoor temperature but can enhance the heat stability of the north wall and ceiling. While not heating, TCM can restrain the fluctuation of the indoor temperature; In this case, if placing more TCM on east and west walls, it will be better for the stability of envelop enclosure. If keeping the heating quantity at a certain value and increase the area of envelop enclosure which has a relatively high heat transfer coefficient, the energy consumption will decrease. TCM can increase the average radiation temperature while not heating. Placing TCM on the walls and ceiling can reduce the nonuniform radiation by20%comparing with the buildings that have no TCM.Fourthly,"equivalent thickness" is proposed to deal with the discontinuous layout of TCM. During heating period, d>0.015m, room temperature is positively related to the d. D<0.015m, the negavative correlation between room temperature and d also can be found. During the period without heating, the regulation function of TCM increases with the increase of d. The worse the weather, the stronger the regulation function. According to the analysis of surface heat storage coefficient, the effective heat storage layer thickness can be determined as0.04m.Fifthly, the objective function can be defined accroding to the the minimum total heat transfer of passing through the envelope, with the total of TCM as the constraint conditions, mathematical model of optimization problems has been established. Through optimization, The best distribution ratio of each envelope was got:TE:TW:TS:TE:TC:TF=1.1:1.1:1:1.13:1.17:1.2.Sixthly, according to the mult-variable linear return analysis and partial correlation analysis, the notable factors that influence indoor air temperature of heat collector coupled with TCM can be ranked as the followings:the mass flow rate of the collector m> solar irradiance G>layout density pc, mathematical model has been established in order to improve the lowest temperature of the indoor air as the optimizing objective. Rule of Optimization: Approprite air supply velocity and equivalent thickness can be selected according to the heat supply of the collector and heat release of TCM. According to the optimization result, the self-adaptive regulation district of passive solar building.