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Phase-change materials are used in an experimental investigation to asses potential solar still's desalination productivity. To our knowledge, there are few studies that compare the effect of different PCMs in enhancement of productivity of solar still. This study examines how various thermo-physical characteristics (Latent heat, melting temperature and specific heat) of three phase change materials affect the improvement in productivity for single-slope solar stills. Vaseline (petroleum jelly-melting point 39 °C), soy wax (melting point 52 °C), and paraffin wax (melting point 67 °C) were the three PCMs that were tested during summer and spring seasons. Kairouan city, Tunisia, located at latitude 35°40′41″ North, longitude 10°05′46″ East, and an elevation of 65 m above sea level is where the experiments were conducted in March and June 2023. The findings demonstrated that the energy storage of a phase change materials (PCM) inside the single-slope solar still (SSSS) caused the desalination process to last longer. It was found that the use of 1.8 kg of PCM in addition to the internal reflector might increases total production for soy wax by 124.74 % and 51.91 %, by 110.68 % and 45.72 % for Vaseline, and paraffin by 103.18 % and 43.35 % in spring and summer respectively. The findings demonstrate that the performance of the solar still can be effectively enhanced by using PCM that have a melting-temperature of 52 °C. Soya wax has the benefits of being both inexpensive and very productive. To confirm the feasibility of these systems, an economic analysis was carried out. One liter of distilled water generated with SSSW, SSPW and SSV costs $0.041, $0.044 and $0.044 respectively instead of $0.045 with a standard solar still (CSS).

The two-dimensional magnetohydrodynamics incompressible flow of nanofluid about a stretching surface is investigated with the existence of viscous dissipation and Joule heating. Moreover, the impact of the convective condition and mass suction is applied with the viscous nanofluid containing copper nanoparticles and the base fluid water. The similarity variables have been employed to transform the coupled nonlinear partial differential equations into the ordinary differential equations and the numerical scheme bp4c is implemented for the further analysis of the solution. The diverse results of temperature, skin friction coefficient, velocity, and the Nusselt number according to numerous parameters have been shown graphically. It appears that the Nusselt number and the skin friction reduces, which is caused by the enhancement of both Hartman number and nanoparticles concentration. Moreover, the fluid temperature surges with the growth of Biot number, and Eckert number whereas the growth of nanoparticles concentration and suction parameter diminishes the velocity and temperature profile. The inclusion of a significant quantity of nanoparticles in the base fluid increases the density of the corresponding nanofluids and accordingly the temperature of the coupled nanoparticles in the base fluids can be modified. Hence, nanofluids build an outstanding performance in electronic components appliances and other electrical devices. The existing research is further effective in refrigerators for stabilizing their rate of cooling.