Eur. Phys. J. Plus (2022) 137: 86
https://doi.org/10.1140/epjp/s13360-021-02157-6

Regular Article

Impact of new multiple twisted tapes on treatment of solar heat exchanger

¹ Department of Mechanical Engineering, Babol Noshirvani University of Technology, Babol, Iran
² Renewable Energy Systems and Nanofluid Applications in Heat Transfer Laboratory, Babol Noshirvani University of Technology, Babol, Iran
³ Department of Civil and Environmental Engineering, University of Pittsburgh, Pittsburgh, PA, USA

^a mohsen.sheikholeslami@nit.ac.ir
^c mbarzegarg@yahoo.com

Received: 10 February 2021
Accepted: 8 November 2021
Published online: 3 January 2022

Abstract

This study investigates the nanofluid turbulent flow due to the presence of helical tapes in solar flat plate collectors. The influence of various twisted tap (TT) and inlet velocity on the thermal efficiency and Darcy factor value of the nanofluid flow is evaluated. Furthermore, the effect of nanoparticle shape on thermal efficiency of solar heat exchanger is studied. The results imply that more mixing occurs in larger values of TT_n and Re. Although augmenting TT_n results in higher pressure loss, thermal efficiency improves with the rise of TT_n. According to achieved outcomes, using twisted tapes notably improves the Nu. As the shape of the nanoparticles changes from spherical to blade form, the heat transfer enhances about 12.12% in solar heat exchanger. Performance (η) augments with rise of shape factor and with changing from sphere to blade shape, η augments about 17.26%. Increase of power of pump makes η to decrease about 9.06%. Utilizing more number of tapes causes η to decline about 2.27%. Increasing inlet velocity and number of tapes leads to augment of Nu about 264.12% and 3.19%.