• Abhishek Bhushan Pandey
• Neha Kumari
• Dr. Pankaj Jain

Solar energy is one of the cleaner forms of renewable energy resources. The conventional solar collector is a well established technology which has various applications such as water heating, space heating and cooling. However, the thermal efficiency of these collectors is limited by the absorption properties of the working fluid, which is very poor for typical conventional solar flat plate collector. Recently usage of nanofluids, which is basically liquid - nanoparticle colloidal dispersion as a working fluid has been found to enhance solar flat plate collector thermal efficiency maximum by 20 percent. A nanofluid is the suspension of nanoparticles in a base fluid. Nanofluids are promising fluids for heat transfer enhancement due to their anomalously high thermal conductivity. At present, there is significant discrepancy in nanofluid thermal conductivity data in the literature. In this paper we study, a detailed literature review about the thermal conductivity of nanofluids is performed. Experimental studies are discussed in terms of the effects of some parameters such as particle volume fraction, particle size, and temperature on the thermal conductivity of nanofluids. Enhancement mechanisms proposed to explain nanofluid thermal conductivity are also summarized and associated thermal conductivity models are explained. Predictions of some thermal conductivity models are compared with the experimental data and discrepancies are indicated.

Aluminium Oxide, Thermal Efficiency, DWCNT, MWCNT, Volume Fraction.

"IMPROVING HEAT TRANSFER EFFICIENCY WITH HELP OF NANOFLUIDS", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.6, Issue 1, page no.206-210, January-2019, Available :http://www.jetir.org/papers/JETIR1901325.pdf

"IMPROVING HEAT TRANSFER EFFICIENCY WITH HELP OF NANOFLUIDS", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.6, Issue 1, page no. pp206-210, January-2019, Available at : http://www.jetir.org/papers/JETIR1901325.pdf