----- Original Message ----- From: "Jinx" > Proposed 1000m stack in Mildura, Victoria, Australia Yowee!!! 3200' stack???!!!! Won't the Greenies love that! (Waaaaaaaaahhhhhh! it's obstructing our view!!! Call the Waaaaaaaaaaahhhhhmbulance [with apologies to The Kid]!!!!!) Sounds really cool! > 5km diameter plastic canopy, 35degC temperature differential > between bottom and top of stack causing 15m/s airflow through > the turbines That's 30+ mph! Lots of energy there! Any predictions as to how much energy they'll be able to actually extract from that? I bet it's a lot! > An article in Silicon Chip 7/2002 says that a pilot scheme with a > 195m stack and 240m diameter greenhouse in Manzanares, Spain > ran for 7 years from 1982-89 producing 50kW of power Not bad for pretty reliable free energy! I think these would have a huge advantage over photovoltaic cells because you can still generate considerable energy on even a cloudy day, since they rely on temp differences rather than on absolute energy input. - Robert -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body