Will this work?

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Jgreenwell

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Induction generator for a high rise building.

http://g5server.net/blog/?p=20

This is a link to my blog, it has a diagram of what I'm considering. I'm looking for feedback, good or bad. I do know that Dr. Nakamatsu has patented parts of this concept but not all of it. If the physics work, it could be a great way to produce electricity locally.
 
the chimney would take up too much floorspace in the building. the thing could never pay for itself. lose the boiler and go with a gas fired turbin cogeneration setup providing electricity and use the waste heat for hot water and an absorbtion chiller for cooling.
 
Look up 'stack effect', and figure out how much pressure differential you get in this arrangement.

I believe that you would need a _very_ tall chimney to make this work.

I did this calc once for the waste heat and exhaust from a heat treating furnace, for exactly this reason: extract the excess energy from the exhaust stream. It made for a very tall and expensive chimney.

-Jon
 
According to the calculations a 1000 foot tall chimney produces a significant amount of CFM. Using the boiler exhaust to superheat the air causes a turbo effect and if the chimney is smaller at the top the velocity is increased. Still seems feasible to produce power this way. The chimney does take up lease space but if the electricity is free?

The 1997 ASHRAE Fundamentals handbook gives the following relationship:

Q = 60 * Cd * A * sqrt(2 * g * (Hn - Hb) * ((Ti - To) / Ti))

where

Q = flow rate in cfm,
Cd = 0.65 (for unobstructed openings),
A = opening area, square feet,
Ti = indoor temp (Rankine),
To = outdoor temp (Rankine),
Hn = height of "neutral pressure point" (for simple systems, assume
1/2 way between top and bottom openings).
Hb = height of bottom opening
g = gravity.

To calculate flow rate, fill in the boxes below.
Area:square feet. 625
Height difference:feet. 1000
Indoor Temperature:F. 200
Outdoor Temperature:F 70
Flow Rate:CFM. 2737000

For a more complete discussion of this, and especially of unusual situations, please see the discussion in the ASHRAE Fundamentals handbook.
 
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