A study of life cycle conversion efficiency and CO₂ role in the pyramid shape solar stills – Comparative analysis

The comparative analysis of the Conventional Pyramid Still (CPS) with the Shaded Pyramid Still (SPS) is fabricated and experimented in estimating the carbon dioxide (CO₂) emission and embodied energy. The single basin square pyramid shape solar still is used for experiments. The daily production of distilled water was measured from both the still for the analysis. The cumulative yield from the CPS is 2.6 kg/day, and SPS is 1.7 kg/day. The outcome of the investigation shows that the CO₂ emission and embodied energy was decreased in CPS as compared with SPS and energy production factor, Life Cycle Conversion Efficiency (LCCE), CO₂ mitigation, and Carbon credit was increased in the CPS compared with the SPS. The LCCE for CPS was 30.39%, and for SPS was 19.98% at 30 years life. Similarly, the CO₂ mitigation for CPS was 20.07 tons and for SPS was 13.19 tons. The distilled water can be sold at Rs. 23.28 per kg for CPS and Rs. 22.67 per kg for SPS and the payback year of both the still were 0.52 and 0.82 years, respectively concerning carbon credit for the expected life year of still is 30 years.