Experimental Thermal Performance Investigation of Evacuated Tube Solar Collector Using Nanoparticals under Cold Climatic Conditions

In this article experimental investigation of thermal performance of evacuated tube solar collector using nanoparticles under cold conditions investigated. The experimental performed under metrological condition of Bangalore, Karnataka, India. In experimentation three water based nanofluid namely aluminium oxide $(\mathrm{A}1_{2}\mathrm{O}_{3})$, Graphine oxide (GO) and strontium Carbonate $(\mathrm{S}_{r}\mathrm{A}\mathrm{D}-\mathrm{O})$ were used. The nanparticales with low concentration (mass basis) of 30, 60 and 90 mg were mixed with base fluid of water. A series of experiments were conducted to evaluate the thermal performance of evacuated tube. The average thermal efficiency of evacuated tube was found to be about 15.47%, 16.07% and 16.40% for 30 mg concentration of $\mathrm{A}1_{2}\mathrm{O}_{3}$, strontium Carbonate $(\mathrm{S}_{r}\mathrm{A}\mathrm{D}-\mathrm{O})$ and graphene oxide water based nanofluids, for 60 mg it was found to be 15.94%, 16.49% and 16.83%, similarly for 90 mg it was observed to be 16.32%, 17.40% and 17.57%, respectively. The results concludes that graphene oxide with 90 mg concentration gives better performance when compared with other combination of nanofluids. Further, it was observed that 90 mg graphene oxide based nanofluid gives about 12.36% improved thermal efficiency when evacuated working with water.