Steady wind pressures on solar collectors on flat-roofed buildings

Radu, Adrian; Axinte, Elena; Theohari, Christina

doi:10.1016/0167-6105(86)90046-2

Cited by 57 publications

(22 citation statements)

References 2 publications

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“…In this respect, SWHs are rapidly becoming an integral part of worldwide measures to combat the effects of climate change. Previous studies [1,2] found that the wind loads on solar collectors are significantly reduced by the sheltering effect of the first row of collectors and of the building itself. For a residential SWH (an inclined solar collector with a horizontal water storage tank), normal to the direction of smooth uniform wind, the study by Chung et al [3,4] demonstrated that localized wind loads at a tilt angle of 15-30 deg.…”

Section: Introductionmentioning

confidence: 99%

Wind Loads of Solar Water Heaters: Wind Incidence Effect

Chou

Chung

Chang

2014

Journal of Aerodynamics

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For applications of solar thermal energy, solar water heaters (SWHs) are becoming common. In this study, the effect of a crosswind on the aerodynamic characteristics of residential (an inclined flat plate with a horizontal cylinder) and large-scale SWHs (an inclined flat plate only) is experimentally investigated. The tests are conducted in a low speed wind tunnel and the relative wind direction with respect to the test model, , ranges from 0 to 135 deg. Measurements of the mean and fluctuating pressures are presented. These results demonstrate that higher suction and fluctuating pressure are observed near the upwind corner, particularly for the test case of = 30 deg.

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Section: Introductionmentioning

confidence: 99%

Wind Loads of Solar Water Heaters: Wind Incidence Effect

Chou

Chung

Chang

2014

Journal of Aerodynamics

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“…Some authors, e.g., Chevalier and Norton [4], measured the moments as well, but the data is limited: the pitch (overturning) moment has not been reported. Radu et al [5] determined wind force coefficients on solar collector arrays mounted on a typical five-story building. Kopp et al [6] measured the loading on PV arrays in a wind tunnel that simulated the atmospheric boundary layer and the building on which the array was mounted.…”

Section: Introductionmentioning

confidence: 99%

Forces and Moments on Flat Plates of Small Aspect Ratio with Application to PV Wind Loads and Small Wind Turbine Blades

2015

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Abstract:To improve knowledge of the wind loads on photovoltaic structures mounted on flat roofs at the high angles required in high latitudes, and to study starting flow on low aspect ratio wind turbine blades, a series of wind tunnel tests were undertaken. Thin flat plates of aspect ratios between 0.4 and 9.0 were mounted on a sensitive three-component instantaneous force and moment sensor. The Reynolds numbers varied from 6 × 10 4 to 2 × 10 5 . Measurements were made for angles of attack between 0° and 90° both in the free stream and in wall proximity with increased turbulence and mean shear. The ratio of drag to lift closely follows the inverse tangent of the angle of incidence for virtually all measurements. This implies that the forces of interest are due largely to the instantaneous pressure distribution around the plate and are not significantly influenced by shear stresses. The instantaneous forces appear most complex for the smaller aspect ratios but the intensity of the normal force fluctuations is between 10% and 20% in the free-steam but can exceed 30% near the wall. As the wind tunnel floor is approached, the lift and drag reduce with increasing aspect ratio, and there is a reduction in the high frequency components of the forces. It is shown that the centre of pressure is closer to the centre of the plates than the quarter-chord position for nearly all cases.

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“…Studies have been performed to estimate wind loads on PV panels and solar collectors. Radu et al (1986) studied wind loads on arrays of solar collectors on the flat roof of a five storey building. Dominance of lift on the solar collectors for any wind direction was observed since the flow separated at the leading edge of the roof and did not reattach.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Wind Loading on Photovoltaic Panels

Jubayer¹,

Hangan²

2012

Structures Congress 2012

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In this study, 3D unsteady Reynolds-Averaged Navier-Stokes (RANS) simulation is performed to predict the wind loading on a set of ground mounted photovoltaic (PV) panels immersed in atmospheric boundary layer. Attention has been given to proper modeling of inlet profiles, boundary conditions and turbulence model constants to minimize stream-wise gradients between the inlet and incident profiles. Distributions of pressure coefficients on top and back surfaces of the panel are investigated. Force and torque coefficients are also reported and the effect of Reynolds number on these coefficients is also discussed.

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Steady wind pressures on solar collectors on flat-roofed buildings

Cited by 57 publications

References 2 publications

Wind Loads of Solar Water Heaters: Wind Incidence Effect

Wind Loads of Solar Water Heaters: Wind Incidence Effect

Forces and Moments on Flat Plates of Small Aspect Ratio with Application to PV Wind Loads and Small Wind Turbine Blades

Numerical Simulation of Wind Loading on Photovoltaic Panels

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