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Conclusions and Recommendations 5.1 Conclusions for Experimental Study of LHTESS with Paraffin Wax The use of latent heat of PCMs in thermal energy storage holds great importance. The first part of the thesis evaluated the performance of a helical coil latent heat energy storage unit with paraffin wax as a phase change material. The charging and discharging characteristics were examined under different operational conditions. The following conclusions are drawn from the results of the experiments: 1) Among the operating parameters, HTF inlet temperature had the greatest effect on the charging time of the storage unit. The increase of the HTF inlet temperature from 70°C to 75°C resulted in a reduction in charging time by 35%. The HTF flow rate also had a substantial influence on decreasing the charging time up to 21% when it was increased from 0.5 to 4 L/min. 2) The charging and discharging tests revealed that natural convection is the main heat transfer mechanism after the onset of melting during charging while conduction dominates the solidification of PCM during discharging. Hence, discharging tests took much longer to complete than the charging tests due to the poor conduction heat transfer within paraffin wax. 3) Switching the flow direction from upward to downward did not show a significant effect on either charging or discharging time. Running the tests at high flow rates resulted in uniform temperature along the heat exchanger coil. Therefore, the flow direction becomes insignificant for the current length of the helical coil heat exchanger. 73PDF Image | THERMAL ENERGY STORAGE USING PARAFFIN WAX
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