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Enhancement of heat transfer on flat-plate solar collector applied to water heating with active recirculation system by passive technique

Abstract

Heating water for domestic and industrial environments is an activity that requires a higher amount of thermal energy, supplied either from burning gas/biomass or direct use of electricity. Nowadays, these conventional methods have greater resistance to their growth in response to inexorable increase of society demand. Therefore, the solar energy has emerged as a suitable renewable energy source for this application type, requiring permanent technology development on solar collector regarding its thermal efficiency in order to meet the application requirements. Overall, the main goal of this research project is provide the numerical simulation and optimization of enhancement of heat transfer on flat-plate solar collector applied to water heating with active system and indirect single-phase flow, by longitudinal vortex generators (type delta-winglet and rectangular-winglet). Currently, twisted taped device is a widely passive technique applied to enhancement the heat transfer inside the circular tubes used in flat-plate solar collector. Although this passive technique provides significant increase of heat transfer its high pressure drop penalty is a concern for pump system. On the other hands, longitudinal vortex generator applied on flat-plate solar collector is a promising alternative since its main characteristics is to provide significant increase of heat transfer on downstream with low pressure drop penalty. (AU)

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
SILVA, FELIPE A. S.; JUNIOR, LUIS; SILVA, JOSE; KAMBAMPATI, SANDILYA; SALVIANO, LEANDRO. Parametric optimization of a stamped longitudinal vortex generator inside a circular tube of a solar water heater at low Reynolds numbers. SN APPLIED SCIENCES, v. 3, n. 8 AUG 2021. Web of Science Citations: 0.
DA SILVA, FELIPE A. S.; DEZAN, DANIEL J.; PANTALEAO, ALUISIO V.; SALVIANO, LEANDRO O. Longitudinal vortex generator applied to heat transfer enhancement of a flat plate solar water heater. APPLIED THERMAL ENGINEERING, v. 158, JUL 25 2019. Web of Science Citations: 0.
DEZAN, DANIEL JONAS; YANAGIHARA, JURANDIR ITIZO; JENOVENCIO, GUILHERME; SALVIANO, LEANDRO OLIVEIRA. Parametric investigation of heat transfer enhancement and pressure loss in louvered fins with longitudinal vortex generators. INTERNATIONAL JOURNAL OF THERMAL SCIENCES, v. 135, p. 533-545, JAN 2019. Web of Science Citations: 2.

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