Study On Solar Heating And Heat Storage System For Solar Buildings

Solar energy is a form of renewable energy,which is widespread and clean.But solar radiation is affected by season and weather.So,it's a reasonable choice to combine solar energy collection with heat storage in solar buildings.This paper includes 5 works as following:(1) We design and develop a solar collection-heating-heat storage system handed on wall.We designed its structure,tested its functional properties.The heating efficiency,thermal storage efficiency were calculated.They are 36.3%,20.7% respectively.The average temperature of the experimental room is about 4℃higher in daytime and 2.5℃higher in nighttime than the ordinary room.(2) We design and build a solar wall whose structure and principle is similar to solar air collector.We designed its structure,tested its functional properties.The results show that in winter of Zhenjiang Jiangsu Province,in sunny daytime,the average heat flux can reach 923W which is above the heat load of the solar building (910W).the average temperature of the experimental solar building can reach 18℃which is 4℃higher than the contrasted room.(3) Using the software of FLUENT,numerical simulation study is carried out to solar collection-heating-heat storage system handed on wall and solar wall.The results show that there are areas where the velocity of air is very low or even still which hinder the thermal exchange between the heat storage cell and hot air in them.(4) Then we design a new type of heat storage box which can make up the defects of the solar collection-heating-heat storage system handed on wall.We also design a new type of solar wall whose appearance is similar to shutters.The new solar wall solves several problems which commonly exist in the traditional solar wall.(5) Finally,we do a lot of experiment to study the thermal performance of glauber salt and analyse theoretically the results of the experiment.The results show that glauber salt's heat-conducting property is good,phase change temperature is appropriate and thermal capacity is great.But there are supercooling and phase separation phenomenas in the process of phase change.If mix glauber salt with nucleator and thickener in the experiment,the phenomenas will disappear.