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I think there's a saturated solution of sodium acetate inside. The metal clickie causes the solution to crystallize, which happens to happen exothermically. (IANAchemist)
Can I use sodium acetate to heat my energy passive home (which I will build soon) by heating it at day in Trombe wall and discharging it at night?
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Someone downmodded you because you messed up your units. It's 4.184 joules per gram Kelvin . Meaning it stores that much energy for each dress of heat you add to it. If you take water from near freezing to boiling that's 100 degrees of storage - meaning 418.4 joules per gram - which is much more reasonable. And there is no reason you have to stop at boiling. Storing something at 500 degrees is not impractical, so ass…
And that's a big part of my question... given that in the abstract water can store any amount of heat (between absolute 0 and the point at which we can no longer call it "water" due to being a plasma of some form), what exactly does it mean for this material to be able to store 4 times as much? I'm sure there's an answer, because I'm sure the journalist got that number from somewhere, but I lack the connections to kn…
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Surely a microwave oven is not 100% efficient in converting the input electrical energy into output heat in the object to be heated? I'm not sure how near 100% it is.
Hey good question. Kitchen microwaves: ~64% – http://en.wikipedia.org/wiki/Microwave_oven#Heating_efficien...