Fast computer graphics techniques for calculating direct solar radiation on complex building surfaces

Jones, Nathaniel L.; Greenberg, Donald P.; Pratt, Kevin

doi:10.1080/19401493.2011.582154

Cited by 30 publications

(11 citation statements)

References 11 publications

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“…Similar to our approach OpenGL has been successfully employed for the accurate computation of direct solar radiation on building surfaces of complex shape at high speeds [23]. Compared to previous implementations [16,35] we gain a striking speedup of three orders of magnitude.…”

Section: Introductionmentioning

confidence: 91%

Numerical simulation of radiative heat transfer in indoor environments on programmable graphics hardware

Kramer

Gritzki

Perschk

et al. 2015

International Journal of Thermal Sciences

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Section: Introductionmentioning

confidence: 91%

Numerical simulation of radiative heat transfer in indoor environments on programmable graphics hardware

Kramer

Gritzki

Perschk

et al. 2015

International Journal of Thermal Sciences

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“…Jones, Greenberg and Pratt [16], in a study of the advantages of computer graphics rendering methods compared with analytical methods, show errors on incident beam radiation and the corresponding computing time when the frequency of the representative days (7, 14 and 28 days) and the angle of discretization are changed. Error values of 5% (for 7 days and 1 • ) and 55% (for 28 days and 20 • ) were found.…”

Section: Introductionmentioning

confidence: 99%

Effect of Sky Discretization for Shading Device Calculation on Building Energy Performance Simulations

et al. 2020

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The calculation of sunlit surfaces in a building has always been a relevant aspect in building energy simulation programs. Due to the high computational cost, some programs use algorithms for shading calculation for certain solar positions after discretization of hemispherical sky. The influence of the level of discretization on the estimation of incident direct radiation on building surfaces, as well as on the required computational times, are studied in this work. The direct solar energy on a window for a year, with simulation time steps of five minutes, has been simulated by using an algorithm based on Projection and Clipping Methods. A total of 6144 simulations have been carried out, varying window sizes, window orientations, typologies of shading devices, latitudes and discretization levels of the hemispherical sky. In terms of annual incident solar energy, the results show that maximum error values are about 5% for a low level of angular discretization. Errors up to 22% in hourly incident solar energy have been estimated for some of the configurations analysed. Furthermore, a great number of configurations show errors of shading factor on a window of up to 30%, which could be most relevant in studies of natural lighting. The study also shows that the improvement achieved by the most accurate discretization level implies an increase in computational cost of about 30 times.

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“…Moreover, the technique may demand a high computational time (sometimes prohibitive), when dealing with geometries with a 1 <https://domus.pucpr.br/>. large number of polygons (JONES; GREENBERG; PRATT, 2012;ROCHA et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

“…Differently from those methods, pixel counting (PxC), that has already been recognised as a powerful technique for external solar shading calculations due to its efficiency to simulate complex architectural models with low computational costs (YEZIORO;SHAVIV, 1994, JONES;GREENBERG;PRATT, 2012;ROCHA et al, 2017) can also be easily extended to be used on interior surfaces. Thus, the technique has been implemented in Domus 1 , which is a user-friendly software for whole-building hygrothermal and energy simulation, developed by the Thermal Systems Laboratory at the Pontifical Catholic University of Parana -PUCPR HENRIQUE, 2003).…”

Section: Introductionmentioning

confidence: 99%

Domus method for predicting sunlit areas on interior surfaces

2018

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This pilot study aims to analyze the solar radiation transmission, daylight performance and glare reduction probability of complex shape solar control devices, developed with parametric modeling and digital fabrication. As methodology, initially the Rhinoceros3D+Grasshopper digital tools suite was used for the parametric modeling of solar control devices. Performance evaluations were performed by computational simulation and measurements in prototypes. For the simulations, the Diva-for-Rhino and Ladybug plug-ins were used. For the measurements, through digital fabrication, a prototype used for glare evaluations through HDR photographs was made. As main results, the solar control devices contributed to the control of solar radiation admission, better daylight distribution and glare reduction in the indoor analysis environment, confirming the reliability of the methodological procedures employed. It is important to highlight the effects of depth and inclination of the devices analyzed, respectively on the daylight distribution and selectivity in the admission of solar radiation between winter and summer. Finally, the shading masks show that despite all the development of modeling and simulation tools, the simple understanding of the solar geometry is still essential for the adequate performance of the solar control devices.

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Fast computer graphics techniques for calculating direct solar radiation on complex building surfaces

Cited by 30 publications

References 11 publications

Numerical simulation of radiative heat transfer in indoor environments on programmable graphics hardware

Numerical simulation of radiative heat transfer in indoor environments on programmable graphics hardware

Effect of Sky Discretization for Shading Device Calculation on Building Energy Performance Simulations

Domus method for predicting sunlit areas on interior surfaces

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