Sounds like a great opportunity for an Elecraft-branded Stirling engine turning 
a small fan:

https://youtu.be/Qshc2yWKq2A

John AE5X
http://ae5x.blogspot.com/
 

 Usually the situation where people do 
> not use fans is when they are operating portable and don't want to 
> waste the power or have extra stuff to pack/set up
____________________________________________________________
Police Urge Americans to Carry This With Them at All Times
The Observer
http://thirdpartyoffers.juno.com/TGL3131/5949c037661ea40372c42st04vuc
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