It is planned to test them on Friday.
Nicely engineered unit had black surface with holes and undersupports to encourage updrafts....
Discussion- Would heat production be increased if solar collector portion was made of material with a higher specific heat capacity than air- fox example, filled aluminum cans filled with water, painted flat black? Water has a capacity of about 4 Joule/deg C/gm vs about 1 Joule/deg/gm for air.
Air Density: A cubic meter of air at 40 degrees C has a mass of about 1.100 kg, vs about 1.170 kg at 25 degrees C. So a solar updraft chimney containing a cubic meter of air might press upwards with a force of about 70 grams. According to the Betz limit, the maximum efficiency for a turbine is 59%, so the most force that could be captured is about 42 grams.
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