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3.3 Summary This chapter presented the performance of a helical coil latent heat thermal energy storage unit under different operational conditions. Charging and discharging processes were studied by varying the HTF flow rate, HTF inlet temperature and flow direction of HTF. It can be concluded that inlet temperature has a greater impact on the charging time compared to the HTF flow rate. The charging time was reduced by 35% when the inlet HTF temperature was increased from 70 to 75°C. Increasing the flow rate from 0.5 to 4 L/min also reduced the charging time of the storage by 21%, whereas the same effect did not result in any reduction in discharging time. It was found that switching the inlet HTF position from the bottom to the top of the container did not lead to a significant change in charging time. Higher recovery efficiency was achieved at higher flow rates during discharging. A poor heat transfer rate stemming from the low thermal conductivity of the paraffin wax was responsible for the long charging/discharging times. Discharging processes were much longer than charging processes since only conduction exists as the main mode of heat transfer. Overall, it was seen that heat transfer enhancement techniques are desired to reduce lengthy charging/discharging times. In the following chapter, the dispersion of highly conductive nanoparticles for heat transfer improvement is proposed as a solution to this problem. 50PDF Image | THERMAL ENERGY STORAGE USING PARAFFIN WAX
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