Energetic and exergetic performance of PCM incorporated ETC integrated solar still under forced mode
Keywords:
Active solar still, Phase change material, Energy, Exergy, IrreversibilityAbstract
The incorporation of phase change material (PCM) enhances the productivity of the solar still as well as makes it continuously operative during low sunshine/night time. This study analyzes the performance of single slope solar still incorporated with paraffin wax as a PCM beneath the basin liner and further integrated with an evacuated tube collector under forced convection. The results have revealed that under similar climatic conditions, PCM-incorporated solar still improves the productivity by 30% compared to the system without PCM, yielding 5.064 kg/day using 15 kg PCM at 0.03 m water depth and flow rate of 0.06 kg/s. The overall energetic and exergetic efficiencies have been found to be 39.56% and 4.05%. Irreversibility has been seen as a function of the intensity of available radiations during the daytime and is crucial at basin liner and, minimum at PCM. Moreover, at night, basin water has the highest irreversibility of ~78% (~30.0 W/m2), while PCM is at a minimum of ~2.0 W/m2. The effect of wind velocity has revealed an increase in energy efficiency by ~3%, reaching a maximum of 44.03% at an optimal speed of 3.0 m/s, while exergy efficiency decreased by ~11%. The increase in PCM and basin water mass has reduced the performance, reaching a maximum of 15 kg paraffin wax for a given water depth.
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