[Bldg-sim] Fast computer graphics techniques for calculating direct solar radiation on complex building surfaces - a paper from the official IBPSA Journal, the Journal of Building Performance Simulation

[Chris Jones]

That is a very interesting paper.  The use of B-Splines is 
particularly of interest as I worked on a program for designing ships 
hulls with my old friend Rolf Oetter at the University of Victoria.

We used B-Splines and knots in a similar fashion.  That was ages ago 
and program is widely in use:
http://www.bclocalnews.com/businessexaminer/vancouver_island/people/28425484.html?period=W&mpStartDate=05-18-2012



At 11:46 AM 02/08/2012, D'Angelo, Joseph wrote:
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>Direct solar radiation has a major influence on a building's thermal 
>behaviour. Current simulation engines are not up to the challenge of 
>accurately modelling solar gains for buildings with complex or 
>curved geometry and buildings sited in dense urban areas. Accurate 
>thermal performance prediction for buildings in early stages of 
>design is hindered by excessive computation time and incompatibility 
>between architectural models and building energy simulation 
>software. This paper proposes using a combination of modern computer 
>graphics rendering techniques and parametric B-spline interpolation 
>methods to quickly and accurately calculate solar gains over a full 
>year based on sparse data with a continuous interpolation method. 
>These new procedures accommodate complex building geometries and 
>intricate shadow patterns and can accelerate shading calculations by 
>several orders of magnitude. Faster calculations allow studies to be 
>made at the early stages of design when modifications can have the 
>greatest impact on a building's thermal behaviour.
>Authors: Nathaniel L. Jones, Donald P. Greenberg & Kevin B. Pratt
>
>Read the full paper here: 
><http://www.tandfonline.com/doi/abs/10.1080/19401493.2011.582154>http://www.tandfonline.com/doi/abs/10.1080/19401493.2011.582154
>
>Warm regards,
>
>Joe
>
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Christopher Jones, P.Eng.
Suite 1801, 1 Yonge Street
Toronto, ON M5E1W7
Tel. 416-203-7465
Fax. 416-946-1005
email cj at enersave.ca
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