Assessment Of Stagnation Temperature And Thermal Efficiency In Conventional And Evacuated Tube Integrated Solar Stills

Abstract

The present study conducts a comprehensive investigation into the thermal characteristics of a solar device by examining evacuated tubes, determining their stagnation temperature, and evaluating the thermal performance of both conventional and evacuated tube–integrated solar desalination systems. The measurements carried out on the evacuated tube confirmed that its physical parameters complied with standard specifications. The stagnation temperature analysis indicated that the evacuated tube could achieve temperatures adequate for effective heating of the working fluid under operating conditions. The Stagnation temperature of triple layer absorptive coating evacuated tube and nano triple layer absorptive coating evacuated tube were found to be 40.0% and 45.5% respectively. Experimental evaluation of the desalination systems showed thermal performance values of 14.0% for the conventional system and 16.6% for the evacuated tube with nano absorptive triple layer coating integrated system. It could be concluded that the evacuated tube integrated solar desalination system would be utilized to match the demand and supply of fresh water in application sectors due to its improved thermal gain, elevated yield of distillate and enhanced thermal performance.