Experimental Study On Natural Convection Of High Porosity Porous Medium During Ice Storage

The technology of ice storage is not energy conservation technology, but it caneffectively adjust electric power load,which is imbalanced at day and night.Thus,it can playan important role in shifting peak load and balancing electric load.National energymacroscopic efficiency will also be enhanced. On the other hand,different electric priceswhich is implemented by our country government can create economic benefits for users.Due to its large aperture, high porosity, high surface area and high thermalconductivity etc., the metal skeleton porous medium material not only can be used in heatexchange, chemical reaction and building energy conservation, but also can be widely used ingeneral industrial field and new and high technology fields.If the skeleton of the porous medium is metal or high thermal conductivity coefficientsolid, there will be a certain temperature difference in its adjacent space point between porousmedium skeleton and fluid. That is to say, it is not at thermal equilibrium condition. In thiscase, there will be two energy equations, one in fluid area and the other in solid skeleton area.Copper net which is of high thermal conductivity coefficient can strengthen heat transfereffect, therefore,this paper experimentally studys on heat transfer law of natural convectionbetween copper net and water through using local non-thermal equilibrium model.Byanalyzing refrigerant temperature, refrigerant flow, the thickness of porous medium andporous medium porosity,we can draw the conclusion that average volume heat transfercoefficient between porous medium solid skeleton and water can be improved by reducingrefrigerant temperature,increasing refrigerant flow, reducing the thickness of porous media orincreasing the porosity of porous medium in the range of this experiment.At last, heat transferexperiment criterion correlations is fitted according to the calculation results of the...