Exothermic Windshield Defroster? Suggestions for a device to de-ice? Answered
Thinking about how to make a device that will automatically defrost my car windscreen about half an hour or so before I get in the car.
I'm pretty sure the huge power consumption of heating elements disqualifies them from this project since it'll be battery powered and I don't much want to fill my car with batteries!
The second idea was to use a homemade burning laser, but I think that was just my evil scientist side popping up and was easily pushed down with arguments such as "it'll be way to complicated" and "it might blind someone".
My next idea was to use some kind of exothermic reaction and pass the heat on to the windshield either by direct contact or through some convection heat sink/fan combo.
1) Does this sound remotely feasible? If not, any better ideas?
2) What reactants would be suitable? The reaction has to produce enough heat over a long enough period to warm up and defrost at least a decent chunk of the windscreen without cracking the glass in the process (I know military MRE's produce heat enough to cook with for about 12 mins). Also the fewer messy reaction products the better (no filling my car up with poisonous gasses please!)
3) Has this been attempted anywhere else? Do you have details or a link? (couldn't find anything after a quick google search)
4) Why didn't my question appear after I tried to post it the first time? Does it have to be moderated first and am I going to look a bit silly when the question appears twice tomorrow?