Help!! Mini-Solar Updraft Tower I need to design and build a "miniature" solar updraft tower and generate the maximum power possible. The only constraints are that there will be a 500W lamp placed 1ft from the ground and 1ft from the chimney oriented at a 45 deg angle. My question is basically about what materials should be used and if the collector area should be 360deg around the chimney or just a section because the light source is fixed? All this while minimizing COSTS. For the collector area I'm thinking of using a clear plastic so that light can come in without problems to create a greenhouse effect. For the baseplate I think I will use wood with a reflective surface like aluminum foil on top so that it does not absorb too much energy, because I'm not looking for a capacitance effect. For the chimney I'm still looking for accessible materials with low surface roughness. Should the chimney be a thermal conductor or an insulator?? And what method can I use to determine the diameter and height of it. I think I should balance the losses due to pipe friction while maximizing the pressure difference but how can I if I have no idea of the velocity of the air inside the chimney? (Should I just assume certain values?) Any ideas and comments are welcome, THANKS!!