Question on wind to electricity convertion from exhuast fans

See previous thread

http://cr4.globalspec.com/thread/5196/Generating-Electricity-from-Exhaust-Fans

Yeah I can't say that would work out too well either. But the fact of the matter is that at least it would be something too strive for if they fail they fail at least it was tried.. If you don't try you fail anyway.

To strive to recuperate energy is a great goal, it's a matter of choosing a plausible approach. Adding load to a ventilation system is simply not an efficient way.

If it were, you could connect two fans in series, run one using the electricity generated by the other and collect the extra energy. Sounds good?

Heat recuperation or a better designed ventilation system to lessen, or modulate upon need, the exhaust volume...may be better experiments to explore.

YES!!

www.VentDepot.com

Item USETE-001

Call Anthony Delgado or Julio Delgado at 1-888-514-1516

The USETE-001 is an exhaust vent driven by outside wind to suck out attic air by the venturi effect. I does not make or use electricity

The post originator was looking for a means to generate electricity by intercepting some of the downstream energy from an exhaust fan.

Incredible how many people are still looking for a free meal!...

Wangito

Exhaust Fan generating electricity!!!!!!!

Think of the driving power required to run the fan to run a step-up gear box.

Personally, I feel it will be wastage of too much for a gain of a very little.

From what you are saying it would be like me trying to run an outboard motor on a boat with a riding lawn mower motor and do it all with hydrogen right? Well it can be done and will. I will DO IT!

Adsolutely agree - this is definitely a no-win situation. Bear in mind that not everything that looks feasible on paper will work in the real world. Much better to focus your attention and budget on making the fan itself more efficient, with a higher efficiency motor, variable speed drive and additional sensors and controls. Clean filters more regularly too. You will save much more energy than you could ever re-coup with the generator idea.

However it is feasible to extract heat energy from exhaust air. You could simply have an incoming air heat exchange (assuming of course you want to heat the incoming air!). We have used reverse cycle heat pumps to heat a building's hot water but placed the external units in the extract air exhaust airflow (not too close to cause loss of extract efficiency). Effectively you are scavenging some of the otherwise wasted heat.

The great thing about hot water is that you need it all year round.

The only thing that may even be plausible is regenerating or reclaiming the heat.

otherwise I agree with the other postings.

Thank you for your comments.