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How about a household hot water heater that uses microwaves to heat the water faster? If it was fast enough, the tank could even be smaller. Not sure about efficiency compared to a standard hot water heater using induction coils. Any thoughts?
Tankless Water Heaters
http://www.tankless-water-heater.com/
Not microwave, but your water is hot when you want it. [Worldgineer, Oct 04 2004, last modified Oct 21 2004]
(?) Microwave Water Heater
http://www.pmengine...,2732,96706,00.html
claims 99.9% efficiency [FarmerJohn, Oct 04 2004, last modified Oct 21 2004]
Microwave Water Heater
http://www.pulsar-at.com
[books97301, Feb 01 2006]
[link]
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I am aware of the tankless heaters. Just wondering if microwaves would be faster or more efficient than convential electric tank heaters. |
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"faster": a heating coil can put as much heat as you want into the water, limited only by electric energy provided and surface area of the coil (to avoid boiling). |
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"more efficient": An electric heating element converts electricity to heat at an efficiency of 100%. An electric tankless hot water heater is about 99.5% efficient, probably due to heat lost through the walls of the device. |
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Ok. Hardly baked then. I admit defeat. |
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That's what I thought, but in a different way. Check out microwave home heating. |
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If your water is hot, why do you want to heat it? |
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In general an electric kettle is more efficient than a microwave for boiling water. This is probably due to the element in the kettle being completely submerged in water and most of the energy produced being put into the water. In the case of a microwave only a percentage of the waves are actually hitting the water. In the case of a microwave water heater, however, I would expect that the water tank would be full and that all the waves would hit the water and you'd end up with similar efficiencies. |
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The microwave water heater will also be able to heat on demand as it can heat the water quick enough that you don't have the standby losses associated with a typical water heater. |
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In addition it should also have the advantage that there is no heating coil to corrode and as a heating coil corrodes the efficiency of the coil - in terms of time to heat and energy required to heat - goes down - probably due to heating up all the corrosion on the coil. |
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Mircowaves are radio waves having frequency where water molecules resonate. The microwave heater transmits these waves inside a shielded box to minimize interference outside the heater.There is no reason the transmitter can't be introduced into a water stream to make hot water on the fly.The problem will be power. |
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How much are the losses from a large,
well-insulated tank of hot water? I'm
guessing they are very small. |
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Plus, in all but warm climates, any
efficiency improvements in appliances just
mean you need to run your home-heating
system that bit more. |
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