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Reducing thermal imbalances and flow nonuniformity in solar collectors through the selection of free flow area ratio

García-Guendulain, Juan M. ; Riesco-Ávila, José M. ; Picón-Núñez, Martín

Energy (Oxford), 2020-03, Vol.194, p.116897, Article 116897 [Periódico revisado por pares]

Oxford: Elsevier Ltd

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Título:
Reducing thermal imbalances and flow nonuniformity in solar collectors through the selection of free flow area ratio
Autor: García-Guendulain, Juan M. ; Riesco-Ávila, José M. ; Picón-Núñez, Martín
Assuntos: Computational fluid dynamics ; Conservation equations ; Cross-sections ; Diameters ; Flat plates ; Flat-plate solar collectors ; Flow distribution ; Flow maldistribution ; Free flow ; Free flow area ratio ; Mathematical models ; Model accuracy ; Nonuniformity ; Numerical models ; Pressure drop ; Solar collector networks ; Solar collectors ; Stress concentration ; Temperature effects
É parte de: Energy (Oxford), 2020-03, Vol.194, p.116897, Article 116897
Descrição: The effect of the riser to header diameter ratio and total cross-sectional area ratio on the flow distribution and thermal performance of flat-plate solar collectors is investigated. An analytical model based on the mass and momentum conservation equations is developed to determine the pressure drop and flow distribution in flat plate collectors. A numerical model is also developed to the assess the thermal effects of flow maldistribution. The accuracy of both models is verified against comparison with experimental measurements taken from the open literature. The use of the models is then extended to cover the flow distribution in solar collector networks. It is found that for laminar and turbulent conditions, cross-sectional area ratios and diameter ratios equal or lower than 0.75 and 0.25 respectively, minimize flow nonuniformity and reduce thermal imbalances. The results can be used for design purposes. •Influence of free flow area parameters on flow maldistribution in flat plate solar collectors is studied.•Tube to header total free flow area ratio and diameter ratio are shown to have a major impact on flow non-uniformity.•Results provide design recommendations for the reduction of flow maldistribution.•Recommended free flow area and diameter ratios apply to both single and networks of solar collectors.
Editor: Oxford: Elsevier Ltd
Idioma: Inglês

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Reducing thermal imbalances and flow nonuniformity in solar collectors through the selection of free flow area ratio

García-Guendulain, Juan M. ; Riesco-Ávila, José M. ; Picón-Núñez, Martín

Oxford: Elsevier Ltd

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