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Harvesting Solar Energy by Means of Charge-Separating Nanocrystals and Their Solids
Published on: August 23, 2012
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Improved solar still productivity using PCM and nano- PCM composites integerated energy storage.
G Murali1, P Ramani2, M Murugan3
1Department of Mechanical Engineering, Koneru Lakshmaiah Education Foundation, Green Fields, Vaddeswaram, Guntur, Andhra Pradesh, 522502, India. muralinitt@gmail.com.
Scientific Reports
|July 6, 2024
Summary
Nano Phase Change Materials (NPCM) significantly boost solar still productivity and efficiency. Adding aluminum oxide nanoparticles to paraffin wax in copper tubes increased daily water production by over 60% and efficiency by nearly 70%.
Area of Science:
- Materials Science and Engineering
- Renewable Energy Technologies
- Thermal Engineering
Background:
- Solar stills are crucial for freshwater generation, but their efficiency is often limited by thermal performance.
- Phase Change Materials (PCM) can store latent heat, improving thermal energy management in solar devices.
- Nanoparticle integration into PCM (NPCM) offers potential for enhanced thermal properties and solar still performance.
Purpose of the Study:
- To investigate the impact of Phase Change Material (PCM) and nano Phase Change Materials (NPCM) on solar still productivity.
- To evaluate the thermal performance enhancement using aluminum oxide (Al2O3) nanoparticles dispersed in paraffin wax (PW) as a latent heat storage (LHS) medium.
- To quantify the improvements in daily production and overall efficiency of a solar still incorporating NPCM.
Main Methods:
- Four experimental scenarios were tested: a conventional solar still, a still with PCM, and two stills with NPCM (0.75% and 2% Al2O3 nanoparticle concentrations).
- PCM and NPCM were contained within 12 copper tubes submerged in 1 mm of water in the solar still basin.
- Thermal properties of NPCM were analyzed using Differential Scanning Calorimetry (DSC); performance was evaluated under local Indian weather conditions.
Main Results:
- The addition of Al2O3 nanoparticles enhanced the specific heat capacity and latent heat of fusion (LHF) of the paraffin wax.
- Solar stills utilizing NPCM demonstrated significantly higher daily production and efficiency compared to the conventional and PCM-only stills.
- The highest NPCM concentration (2% Al2O3) resulted in a 60.37% increase in overall productivity and a 68.29% improvement in overall efficiency.
Conclusions:
- Incorporating NPCM, particularly with higher nanoparticle concentrations, is an effective strategy for enhancing solar still performance.
- NPCM improves thermal energy absorption and release during the phase change process, leading to increased freshwater output.
- This study highlights the potential of NPCM as a viable solution for improving the efficiency and productivity of solar desalination systems.
