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Comments on Saturday 18 July 2009:
Boiling up a single roobois teabag in a lot of water, for the making of iced tea, it strikes me that I'm using quite a lot of stovetop heat inside an air-conditioned house. There's a lot of waste heat, and then a lot more power wastage to get that waste heat out of the house.

Another observation from today, the seat in the car is bloody hot.

Combined observations that give me an idea; I want a pot with a black cast iron exterior and stainless steel interior, and a glass shell that goes over it, which would be good for making anything that requires a medium heat for a long time, like casseroles or vats of iced tea, just by leaving them outside in the climate of Florida. (Or, in the future, the climate of a tropical island.)

There are already solar cooker plans, but those all involve reflectors that would make it more awkward to use. Also, a glass shell over the top and perhaps a rubber ring that it rests on would keep ants and mosquitos from getting at the container (though I suppose boiling temperature and a lid would keep them off pretty well too). [20:23]

maxor
Why not just make sun tea? Known in most of the US and made by just putting a couple of tea bag's (string out) in the top of a juice bottle with the label off. Retrieve when you come home from work. place in fridge. At the same time get out yesterdays from the fridge drink all night. Rinse repeat.

RavenBlack
I have, but actually boiling changes the flavour and gets more out of the teabag (as well as, conceptually, meaning you could make it with bad water).

Wally
Or perhaps you could invest in an inductive cooktop… You could heat an iron plate inside a thermos vessel, and retain 100% (barring losses to various processes of thermodynamics, I in no fashion endorse or suggest any endevour which would violat causality or the conservation of energy) of the generated heat towards it's intended purpose. Then again, I live in a climate with minimal available solar insolation, and "waste" heat is a valuable commodity much of the year.
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