Title: Preparation of Co₃O₄-H₂O nanofluid and application to CR-60 concentrating solar collector

Authors: T.V.R. Sekhar; Ravi Prakash; Gopal Nandan; M. Muthuraman

Addresses: Department of Mechanical and Automation Engineering, Amity University, Uttar Pradesh, Noida, 201303, India ' Department of Mechanical and Automation Engineering, Amity University, Uttar Pradesh, Noida, 201303, India ' Department of Mechanical and Automation Engineering, Amity University, Uttar Pradesh, Noida, 201303, India ' NTPC Limited, Noida, 201301, India

Abstract: Co₃O₄-H₂O solution along with surfactant is subjected to magnetic stirring and ultra-sonication at 60°C. The obtained homogenous dispersant was divided into four samples of varying volume fractions 0.1vol% to 0.4vol%.Each sample was filled in a metered tank and recirculated in a closed loop solar thermal collector. The setup was subjected to incident solar flux with an average value of 650 W/m².At a constant fluid flow of 4LPM, the heat transfer coefficient was evaluated for different volume fractions of nanofluid. The obtained values are compared with the values for water as the working fluid. It was observed that at 0.4vol% of nanofluid and 60°C fluid temperature, the heat transfer coefficient increased by 8% when compared to the values for water.

Keywords: cobalt oxide; CR 60; nanofluid; solar thermal.

DOI: 10.1504/PIE.2017.091296

Progress in Industrial Ecology, An International Journal, 2017 Vol.11 No.3, pp.227 - 246

Received: 16 May 2017
Accepted: 27 Nov 2017
Published online: 23 Apr 2018 *

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