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Storage Efficiency Experimental energy storage efficiency was also determined by finding the instantaneous energyinputs/outputstothestorageusingequations(3)and(4).Theinlet(π )andoutlet temperature (π ) readings of the HTF, which were recorded every 20 s (βπ‘), were used in π the calculations. πΆπ,π»ππΉ and πΜ π»ππΉ stand for the specific heat capacity and mass of the HTF, respectively. π π π’ππππππ π πππππ£ππππ ΓπΆ π₯(π βπ) (3) =βπ‘ΓπΜ π»ππΉ π,π»ππΉ ππ π = βπ‘ Γ πΜ π»ππΉ Γ πΆ π,π»ππΉ π₯(π β π ) (4) π ππ The recovery efficiency of the storage, π, can also be determined. The ratio of recovered energy from the PCM storage during discharging to the supplied energy to the PCM storage during charging yields the overall recovery efficiency of the storage, which is defined as follows; π = ππππππ£ππππ (5) ππ π’ππππππ The recovery efficiency of the storage ranged between 35-62% for the specified discharging flow rates. The highest efficiency was found at a discharging flow rate of 2 L/min, while the lowest efficiency was determined to be 35% for 0.5 L/min. This accounts for the dynamic release of the energy stored in the wax at a higher flow rate. It should be noted that calculations did not consider the heat losses from the storage container to the surrounding environment. ππ 49PDF Image | THERMAL ENERGY STORAGE USING PARAFFIN WAX
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