The question concerns the design of emergency generator placed inside a proposed building. The exhaust flue must be placed inside the walls extending up to the top of the building. Because of a long equivalent length of the exhaust flue(about 40-50 FT and bends), the calculated pressure loss exceeds that suggested for the generator. One solution is to increase the size of the flue by making it rectangular and long on one side instead of circular to reduce the friction loss. However, I read that the the velocity must exceed a certain velocity to keep the diesel residue from falling out. Another is to place an expensive fan at the top of the building to draw the exhaust gas out, as they do with hospitals. Are these the only options? The generator is 200 kw.
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