Preparation And Characterization Of Light Conductive Thermal Storage Concrete

The type of thermal storage solar building with thermal storage walls can maximumly absorb and store solar energy,which reduces indoor temperature fluctuations.However,its thermal storage capacity is limited and light-proof,resulting in inadequate indoor lighting.In order to solve these problems,light conductive-thermal storage concrete is developed in this paper.It solves the above disadvantages of normal building material and plays a significant role in promoting thermal storage solar buildings.Paraffin /LDPE/ graphite from stabled phase change materials are prepared by melt blending in this paper with low temperature paraffin as phase change materials,low density polyethylene(LDPE)as carrier material,and graphite powder as heat conduction materials.Analysis the performance of from stabled phase change materials by differential scanning calorimetry(DSC)test and scanning electron microscopy(SEM)test.The preparation of phase change thermal storage mortar is added from stabled phase change materials to cement mortar by direct mixing method.Make sure the best ratio of phase change thermal storage mortar based on the mechanical properties test,DSC test and SEM test.Finally,mix light conductive material with phase change thermal storage mortar to prepare light conductive thermal Storage concrete,then test its mechanical properties.Prepare light conductive-thermal storage concrete trombe wall,and apply it to thermal storage solar building model to test its Energy saving effect.The main research results are as follows:(1)Use paraffin / LDPE / graphite composite prepare stable phase change materials.When the ratio of paraffin and low density polyethylene(LDPE)is 6:4,Graphite accounts for 4% of the mass of paraffin and LDPE,the PCM latent thermal loss rate is the smallest,and the phase change temperature is highest,and phase change temperature is closest to the paraffin.(2)By direct mixing method,combine PCM and cement mortar to prepare phase change thermal storage mortar.When the content of the phase change material is 40% of the cement quality,the latent thermal of phase change thermal storage mortar is highest,strength is equal to the strength of ordinary clay brick.In the 24 h up-down temperature recycling,the minimum temperature of phase change thermal storage mortar is 0.8? higher than that of cement mortar,and its minimum temperature time delay 30 minutes.(3)Uniformly arrange the light conductive resin material into the cement mortar to prepare light conductive concrete.When the light conductive material shape is rectangular and the light transmitting area is 25%,the 28 d compressive strength of light conductive concrete is highest,up to 58.9MPa.(4)Combine phase change thermal storage mortar and light conductive materials to prepare light conductive-thermal storage concrete.The flexural strength and compressive strength of28 d are 2MPa and 16.2MPa,respectively.And the early strength development of light conductive-thermal storage concrete is quick,the compressive strength of 7d can reach 94.6%that of 28 d.Through the up-down temperature recycling test for model,it's found that the lowest indoor temperature of the light conductive-thermal storage type solar house is 1 ?higher than light conductive thermal storage type solar house,and 4.6? higher than ordinary solar house.The temperature fluctuation range of the light conductive-thermal storage solar house is 2.7? lower than that of the light conductive solar house,and 10.2? lower than that of the ordinary solar house.The application of light conductive-thermal storage concrete in trombe wall with transparent effect not only saves energy but significantly reduces the indoor temperature fluctuations,which plays an important role in improving the stability of the indoor thermal environment.