Cedric Chang wrote:
> I want to build the following invention for a client.  There is no  
> NDA.  A air mover of some sort forces air up a tube and out some jets  
> on the windshield/windscreen of a car/truck.  The air is heated via  
> compression and possibly an electric heater.  The hot air defrosts  
> the WS and melts thin coatings of ice.
>
> The "Hottie" as I am calling it, is powered from an Auxillary  Lead  
> Acid Battery that is charged by the vehicle alternator.  When the  
> engine is not running , the Hottie can still defrost the glass  and  
> also heat the WS wipers.  I plan to put a set of jets across the top  
> of the WS, anchored and shaped so they offer little wind resistance.   
> The battery will disconnect when it is out of SOA. ( Safe Operating  
> Area )  Optionally, the Hottie may turn the wipers on if snow/sleet  
> falls and keep the WS free of snow accumulation.  Even when the  
> vehicle is unoccupied.
>
> There will sensors ( don't know what yet ) that will detect the WS is  
> fogged or iced.
>
> The main vehicle battery will not be discharged.  Everything will fit  
> in the engine compartment.
>
> Has anyone suggestions for the air mover ?
>
> cc
>   
You could use heated air from the manifold when the engine is running to 
the save energy otherwise used to heat the air while the engine is running.

Experimentation  with a  computer  style  fan  may  work.

or use water that has antifreeze non corrosive (salt?)  agent and 
recycle the water :-)

Roy


 
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