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3-D NUMERICAL SIMULATION OF HEAT TRANSFER ENHANCEMENT IN A RECEIVER TUBE OF SOLAR PARABOLIC TROUGH COLLECTOR WITH TWISTED−TAPE INSERTS AND MWCNT-NANOFLUID

DOI: 10.1615/ICHMT.2014.IntSympConvHeatMassTransf.250
pages 347-358

Shahrzad Ghadiri-Jafarbeigloo
Energy Department Materials and Energy Research Centre, Emam Khomeini Blvd, Meshkin Dasht, Karaj, Iran

Mohammad Hossein Abedini-Saniji
Mechanical Engineering Department Shiraz University, Shiraz, Iran

Seyed Amir Hossein Zamzamian
Solar Energy Group, Energy Department, Materials and Energy Research Center (MERC), Karaj, Iran

Mahmood A. Yaghoubi
School of Mechanical Engineering, Shiraz University, P. O. Box 71348-51154, Shiraz, Iran; Academy of Science, I.R. Iran

Аннотация

For a concentrated solar power's collector (CSP), having high convection's heat transfer coefficient is a major factor for optimum energy transfer from sun to heat transfer fluid. In this investigation, heat transfer enhancement of multi-walled carbon nanotube (MWCNT)/heat transfer's oil nanofluid in the receiver tube of a solar parabolic trough that equipped with the typical twisted-tape (TT) studied numerically. Twisted-tape generates swirling flow and make the flow more turbulent and enhance heat transfer rate between the heat transfer fluid and inner surface of receiver tube. Threedimensional numerical simulation is made with three different volume fractions of 0.05%, 0.1% and 0.2% and twisted-tape with twist ratio (TR=y/w) of 2.67 that y is twist length and w is tape width. Flow regime is turbulent and non-uniform solar wall heat flux is assumed as thermal boundary conditions. Absorbed solar radiation on receiver and glass tubes are determined for the noon hour of the first day of summer by SolTrace software. Results show significant enhancement in Nusselt number (Nu) and pressure drop (ΔP) for the tube with TT insert and MWCNT nanofuid, comparing with plain tube without nanofluid.

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