I need to test glare and daylighting conditions in a model that is about 3x3m and 1m high . Unfortunately my university doesn't have an artificial sun, is there other alternative methods? or does anyone know if I there are private labs that have artificial sun around Houston, Texas, or even anywhere in the US that I can use for few days?
Have you considered ujsing the real sun? If you can,. take the model outside and measure what really happens. The only thing thst is`crucially important is to ensrue that external obtructions and reflecting surfaces match those of the actual site.
Of course, you get only the sun positions that occur on the days you are measuring. This may be enough to answer the questions you are asking in the research. Alternatively, by rotating and tilting a (small) model you can simulate any sun position, and if the illumination is strong sunlight the relative error from ian ncorrect sky luminance distribution is often very small.
I like Peter Tregenza's answer. With the size of your model, even using a slide projector or similar mostly-collimated source from quite a distance will result in some diverging of the light. Rotating and tilting gives you additional leverage beyond what you will experience when you bring it outside, but of course the sun bever stopsn moving so you are limited in the number of observations/measurements you can make at a time.
Peter and John, thank you so much for your help. I can take the model outside for testing. Although, I won't be able to tilt it because it has many dynamic pieces that are being moved by motors or linear actuators and I don't want to risk having pieces fall off the model. I might just depend on computer simulations.
Dear Mehdi I apologize for the delayed response. I'll definitely contact Prof. Lechner. Thank you so much!
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