الفهرس 
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Abstract
The present work shared with an effort in the world interest of solar energy storage as sensible and or latent heat of fusion.
Some solar energy parameters at the site (El-MINIA Province ) were assessed and used for application in conjun-ction with TES.
LMPA were studied for their storage potential in relation to their constitution.
The increasing percentage of Ei was found to increase the rate of cooling in the liquid phase and transient region accompanied with decreased rate in the solid phase.when Bi was kept constant, the pb increase resulted in ahigher rate of cooling both in the liquid and transient regions, too Eut the reverse was observed in the solid phase. The latent heat of fusion of the LMPA used behaved in an analogous trend as that found for cooling rates when parcentage of Bi was considered .
In compar-ison with water as a TES medium , more than double the TES-capacity can be realised by LMPA when temperature was increased to 100c.
Morevar, capacity of LMPA is as much as 1.5 times that of Glauler,s salt.
Investigating some local clays for their sensible-heat storage capacity revealed that they are superior to sand in this respect due to their lower cooling rates.
Tebben and marazic clays gave the highest heat storage capacity with specific heats of 5-4.4 j/gm c and cooling rates of 0.5-1.8c/min.
The kana clay ranked the lowest in TES giving aspecific heat of 1.11 j/gm c. and the highest in the rate of cooling (3.8 c/min) Abou-korcas vlay gave intermediate properties . these results were obtained through the study of the thermodynamic proberties of the used clays asp-ecially by DTA and DSC methods.