Experimental and Analytical Examination in Solid Sensible Cylindrical Heat Storage Block Consisted of Ferronickel Slag

Using ferronickel slag as heat storage medium, low cost solid sensible heat storage system for concentrating solar thermal power generation plant has been considered. Effects of ferronickel slag mix on amount of heat storage of mortar block specimen using ferronickel slag as a fine aggregate are evaluated. It has been shown that amount of heat storage increases as volume fraction of ferronickel slag increases in heat storage test. On the other hand, it has been shown that variation of amount of heat storage with volume fraction of ferronickel slag differs between numerical results in steady state and those in unsteady state in numerical calculations based on theoretical analysis. The reason is explained by variations of specific heat capacity and thermal conductivity in the block with volume fraction of ferronickel slag. Variation of amount of heat storage in the block in unsteady state with volume fraction of ferronickel slag has been clarified.