[Radiance-general] HDR Sky Camera @ LBNL's Flexlab

[Santiago Torres]

Hi German,

There is some interesting work on simulation based controls for daylighting from the TU Wien. See here:
http://www.ibpsa.org/proceedings/BS2005/BS05_0693_700.pdf
http://www.ibpsa.org/proceedings/BS2005/BS05_1163_1170.pdf

Santiago



From: CHI-German Molina [mailto:gmolina at hdlao.com]
Sent: 2014年6月28日 5:38
To: Radiance general discussion
Subject: Re: [Radiance-general] HDR Sky Camera @ LBNL's Flexlab

Wow, I have been thinking on doing this for a while... although I have no idea where to start from.

Is it possible to calculate the Daylight Coefficients of the building; and use the HDR image to generate sky vectors and calculate different options for optimizing daylighting?

I am picturing a computer that, every 5 minutes, calculate the sky vector, computes the interior lighting conditions, and simulates the different lighting options performing a whole-building lighting control with no photo sensors. Even more, maybe a whole neighborhood could use the same camera. Nonsense?

Thanks for sharing!

2014-06-27 0:59 GMT-04:00 Joe Smith <the.oat.cracker at gmail.com<mailto:the.oat.cracker at gmail.com>>:
Hi, Andy, thanks for sharing LBNL's sky mapping experiment!

Can you kindly advice on resources that elaborate on how to use HDR sky image for daylight simulation? Does it involve specifying the HDR image, rather than a "skyfunc", as the material identifier for the sky geometry? How is the pixel value of a given point on the HDR image converted to luminance value of the corresponding position on the sky?

Thanks!
- Joe

Andrew McNeil <amcneil at lbl.gov<mailto:amcneil at lbl.gov>>于2014年6月27日星期五写道：

Hi Everyone,

LBNL has installed an HDR sky camera at our new FLEXLAB site: http://flexskycam.lbl.gov. I've uploaded sample data, including hdr images and csv datafiles, recorded by the camera for three days over the past week( clear, partly cloudy and overcast). We're happy to share more data with other researchers and daylight practitioners (but we don't have much to offer yet).

The images can be mapped to a Radiance sky for simulation under real sky conditions. I have not used the sky HDR images yet, myself, so if anybody uses them successfully please report back and share what you've done!

Questions about the camera hardware and capabilities should be directed to Chris Humann at Terrestrial Light.

Best,
Andy

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Germán Molina L.
Ingeniero Trainee
Hunter Douglas Chile S.A.
Celular +569 89224445


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