[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 cj at enersave.ca
Sat Aug 4 09:35:09 PDT 2012

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:

At 11:46 AM 02/08/2012, D'Angelo, Joseph wrote:
>Content-class: urn:content-classes:message
>Content-Type: multipart/alternative;
>         boundary="----_=_NextPart_001_01CD70C6.0662EB3E"
>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: 
>Warm regards,
>The information contained in this email message may be confidential. 
>If you are not the intended recipient, any use, interference with, 
>disclosure or copying of this material is unauthorised and 
>prohibited. Although this message and any attachments are believed 
>to be free of viruses, no responsibility is accepted by Informa for 
>any loss or damage arising in any way from receipt or use thereof. 
>Messages to and from the company are monitored for operational 
>reasons and in accordance with lawful business practices.
>If you have received this message in error, please notify us by 
>return and delete the message and any attachments. Further 
>enquiries/returns can be sent to postmaster at informa.com
>Taylor & Francis Group is a trading name of Informa UK Limited, 
>registered in England under no. 1072954
>Bldg-sim mailing list
>To unsubscribe from this mailing list send  a blank message to 

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
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/bldg-sim-onebuilding.org/attachments/20120804/219de9a7/attachment-0001.htm>

More information about the Bldg-sim mailing list