| The energy consumption of buildings has been a problem that has plagued the world for many years,and the total energy consumption of heating,ventilation and air conditioning has always played a dominant role in the energy consumption of buildings.How to realize the "open source and reduce expenditure" of buildings and how to better integrate solar energy and buildings has become the focus of people's attention.The purpose of this paper is to improve the SST,a new type of embedded heat collecting element designed by predecessors,which has a special geometric shell in accordance with the equation,and can realize the selective absorption of outdoor solar radiation and reduce building energy consumption.In the previous work and practical engineering use we found that the existing SST structure does not produce obvious energy saving effect,and the main factor causing this phenomenon is that the geometric size of SST is too small,while too large geometric size will lead to the acceleration of indoor and outdoor heat transfer,but increase the building energy consumption.Therefore,the most appropriate size of SST is the focus of this paper.Moreover,it is intended to improve the existing SST unit and propose a new SST structure in this paper,which can accelerate the production of SST,reduce the cost and better integrate with the building.In order to study the correlation between geometric size and SST energy saving efficiency,this paper first established SST units of various sizes through Solid Works,and used ANSYS CFX software to simulate its heat and mass transfer in typical winter and summer seasons.The optimal solution was selected,that is,the opening size was 105mm×105mm,and the length was 90 mm SST size for further experimental verification.In order to verify the simulation results,verify the reliability of the simulated heat and mass transfer results.The mold of SST was made,a new SST structure was obtained through extrusion molding processing,and the experimental table was built.By simulating the specific meteorological parameters outside,experiments were conducted to verify the SST simulation results.By some additional means of detection.We obtained a series of experimental data from the infrared imaging software and the infrared thermograph.By comparing with the experimental values,we obtained the following results:(1)starting from the opening size of 115 mm,each time the SST opening size is reduced by 10 mm,its internal temperature field and velocity field are changing.With the decrease of size,the air domain inside SST changed from two large vortices to one vortex.In addition,it can be seen from the temperature field that the heat transfer gradually changed from convective heat transfer to heat conduction,and the distribution of the temperature layer changed from the horizontal temperature layer in the middle of SST to gradually vertical.(2)start from the SST opening size of 115 mm,and build the model every 10 mm.The external temperature was 35? and the indoor temperature was 26?.It was found that the heat flux lost by the cold wall surface reached the minimum when the opening size was 105 mm,that is,the SST size was 105mm×105mm×90mm,and the above conclusion was further verified by the working conditions in winter.(3)in the multiple sets of data measured by the infrared thermometer and thermal imager,we found through observation and comparison that the variation trend of the experimental data was very similar to the simulated value.Although there was some error,it was considered to be within an acceptable range through careful and reasonable analysis.In this paper,SST units of different sizes are simulated by experiments,and the most suitable size is obtained.Under this size,SST achieves the highest energy saving efficiency,and the size matches the building modulus,which is convenient to use in a large number of buildings.The paper has 65 pictures,15 tables,and 87 references... |
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