Experimental investigation of heat transfer and fluid flow behavior of packed bed solar thermal energy storage system having spheres as packing element with pores

•The performance of spheres having pores as packing element is reported.•The effect of D/d, D/t and Re on the Nu and f has been investigated.•Overall energy balance is also investigated in terms of thermo-hydraulic parameter. Packed bed storage system is one of the viable options of solar thermal en...

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