h a l f b a k e r yGuitar Hero: 4'33"
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Some simple binary indicator on a kettle that says that it's still hot from a recent boil, and switching it on would only result in immediately boiling again.
Not as complex as a thermometer or temperature readout, just a simple thing that says whether or not it's worth boiling the kettle (if it's
a multi-user kettle, the previous account might have just boiled it, for all you know).
Or paint, similar to this
http://www.motorcyc...ory=NEWS_OTHER-NEWS
[Ling, Oct 31 2005]
[link]
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You can get little liquid crystal thermometers that stick onto stuff; often used on fishtanks. I suspect they're available in a range of granularities. You would want one that only distinguishes between "> 90 degrees" (or whatever characterises "still hot") and "< 90 degrees". |
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Since most of the world is concerned with energy saving this would be a very good idea. It could be done with a floating density...um...thingy (I used to know what the were called but I have forgotten) but this may stop working over time. Electronic components are expensive if they are designed to be used at temperatures over 100C. |
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Ian, I have also seen coloured crayons that change colour according to temperature. You could check temperature stratification if required. One could get a child to spend an entertaining half hour, legally scrawling all over it. |
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I think a temperature indicator, even something passive such as angel suggests, is the way to go. Some drinks require boiling water, some require water that is below boiling. |
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How much energy are we talking about saving here? A 2000W 10 second burst every now and then? |
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If the device saves you 20kJ every day, your temperature readout will pay for itself in ~35 years. |
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