Economics at your fingertips  

Experimental studies on heat transfer and friction factor characteristics of twist inserted V-trough thermosyphon solar water heating system

A. Saravanan, J.S. Senthilkumaar and S. Jaisankar

Energy, 2016, vol. 112, issue C, 642-654

Abstract: Experimental investigations of friction factor and thermal performance of V-trough thermosyphon solar water heater with helical twisted tapes of various twist ratios (Y = 3, 4, 5 & 6) have been performed and presented. Experimental trials were made under same operating conditions and results were compared with plain tube V-trough (PVT) solar water heater and also with plain tube flat plate (PFP) solar water heater. Experimental data for the PVT solar water heater is compared with the fundamental equations and found the discrepancy of ±15.06% and ±3.91% for Nusselt number and friction factor respectively. Results show that PVT collector offers better thermal performances when compared to PFP collector. It is due to the increase in solar concentration by the use of additional reflecting surfaces in solar collector. Moreover the usage of helical twisted tape creates the swirl flow inside the riser tube, which in turn increases the thermal performance and pressure drop. The minimum twist ratio 3 offers 19.01% higher thermal efficiency when compared to plain V-trough collector. Empirical correlations have been developed for Nusselt number and friction factor to match the experimental results and deviation fall within ±10.3% and ±6.74% respectively.

Keywords: V-trough; Reflector; Convective heat transfer; Swirl flow; Friction factor (search for similar items in EconPapers)
Date: 2016
References: View references in EconPapers View complete reference list from CitEc
Citations View citations in EconPapers (1) Track citations by RSS feed

Downloads: (external link)
Full text for ScienceDirect subscribers only

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link:

Access Statistics for this article

Energy is currently edited by Henrik Lund and Mark J. Kaiser

More articles in Energy from Elsevier
Bibliographic data for series maintained by Dana Niculescu ().

Page updated 2018-07-07
Handle: RePEc:eee:energy:v:112:y:2016:i:c:p:642-654