This is a natural heater by the sun. While parabola curves are utilised for making sun-beams focused at air conduits, the sphere can store and circulate warmed airs in its inside. Each parabola's axis directs toward the sun along its movement at a specific date, which refers to "Phototropism" of natural plants. The definition of the accurate azimuth of the sun is completely owing to <a href="http://tedngai.net/experiments.html" target=" _blank">the incident solar definition by Prof. Ngai.</a> A C.F.D. simulation is utilised for the analisys of its performance depending on parametrical settings.
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