Thermodynamic modeling and performance analysis of newly conceptualized Double basin concentric tubular solar still

With the increasing demand for clean and fresh drinking water, there is a growing interest and necessity for the development of water distillation systems that incorporate green technologies. In light of this, the present research work focuses on the thermodynamic modelling and analysis of a newly conceptualized design called Double Basin Concentric Tubular Solar Stills (DBCTSS). The present investigation considers essential thermodynamic performance parameters that are applicable to any solar-based water distillation system. These parameters include the glass cover temperature, basin water temperature, basin temperature, daily yield of freshwater distillate, modified convective, evaporative, and radiative heat transfer coefficients, cumulative yield, energy efficiency, and exergy efficiency. The research investigates the individual and combined effects of the upper basin and lower basin effect by using performance perimeters. The results demonstrate that both the first and second basin effects affirm the superiority of the proposed DBCTSS design. The total yield achieved by this system is 6.424 kg/m², which represents a 51.86% increase compared to the experimental work conducted on a conventional tubular solar still that utilizes sand as the energy storage material (CTSS with sand). Furthermore, the maximum thermal efficiency for the first and second basin effects is found to be 60.053% and 37.48%, respectively. Similarly, the exergy efficiency values are determined to be 5.092% and 2.1%, respectively.