Enhanced Productivity of Parabolic Solar Still Using -Mno2 Nano Particles

Abstract

Parabolic solar still of area 0.25m2 is designed using mild steel and its enhanced productive yield with -MnO2 nanoparticles had been analyzed. Microwave assisted solution method have been used to synthesis α-MnO2 nanoparticles. XRD analysis of prepared -MnO2 nanoparticles size is found to be 35 nm. FTIR revealed the chemical composition and interaction of functional groups of MnO2 nanoparticles. SEM image shows the aggregates are mostly particles with random shapes. HRTEM image confirms the average particle size was around 35 nm. From the optical study it is inferred that the energy band gap value as 2.69 eV and the conductivity of prepared nanoparticles is found to be in the order of 10-7 S cm-1. Thermal stability of synthesized MnO2 nanoparticle has been analyzed with the help of TG study. Electrical conductivity of MnO2 have is in the order of 2.35×10 -7 Scm-1 as calculated from AC impedance spectroscopy. Heat Transfer phenomena under internal and external transfer modes along with thermophysical properties such as thermal conductivity, dynamic viscosity, density and latent heat of distillate yield is calculated. Instantaneous efficiency of parabolic solar still without and with MnO2 nanoparticles are found to be in the range of 11.52% to 40.71% and 10.94% to 46.32%. Similarly, overall efficiency is found to be 30.01% and 35.27%. The distillate productivity is mainly depended on the thermal parameters such as saturated vapor pressure and latent heat is observed as 8762 J/Kg, 9510 J/Kg, 2391875 Pa and 2388435 Pa for parabolic still in two modes of study.