energy efficiency
energy efficiency
There are some heating devices that were used in our lives, such as microwave oven, electromagnetic oven electronic heating oven and gas oven, but do you know the order of energy efficiency?
Re: energy efficiency
Hi.
As all you mention are ovens, the efficiencies are all 100%, all the power fed to them is converted to heat.<p>Their insulation can change facts as to where the heat is first directed, but after all, all energy goes to heat. For cooking efficiency, it is matter of how well the insulation avoids heat losses to the ambient.
The case of burning fuels, can deviate if combustion is not complete, and the amount lost in the exhaust chimney.<p>Miguel
As all you mention are ovens, the efficiencies are all 100%, all the power fed to them is converted to heat.<p>Their insulation can change facts as to where the heat is first directed, but after all, all energy goes to heat. For cooking efficiency, it is matter of how well the insulation avoids heat losses to the ambient.
The case of burning fuels, can deviate if combustion is not complete, and the amount lost in the exhaust chimney.<p>Miguel
- Abolish the deciBel ! -
Re: energy efficiency
When you consider that you've already lost around seventy percent of your origional energy before electricity gets to you I think the gas fired appliance has a big advantage.
Since the microwave heats the food more than the oven and surroundings it is probably the most efficient of the electric ovens.
Since the microwave heats the food more than the oven and surroundings it is probably the most efficient of the electric ovens.
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Re: energy efficiency
Disregarding the inefficiencies of generating electrical energy since it isn't your problem (and getting that natural gas or propane to you isn't exactly the model of perpetual motion) --<p>IF your conventional electric oven had perfect insulation and didn't have that vent for the moisture that baking drives out of the foods, it should be 100% efficient. Actually, with no insulation, a big vent, the door cracked open and a Thanksgiving turkey inside, it's still 100% efficient, since all the electrical current is converted to heat.<p>The gas oven is less efficient, for part of the converted energy is light as well as heat. And then there's the issue of whether or not the gas (butane, propane, natural gas, whatever) completely burns since it may not receive all the oxygen it needs to do so. In addition, the actual chemical reaction of burning (usually because of the lack of sufficient oxygen) doesn't always produce the "perfect" byproducts and you end up with carbon dioxide, carbon, carbon monoxide, etc.<p>The microwave oven has a transformer -- not 100% efficient; a magnetron -- not 100% efficient; associated support electronics -- not 100% efficient; a "cavity" that'll always have some leakage -- not 100% efficient; a waveguide of sorts -- not 100% efficient. No, a microwave oven isn't necessarily efficient. It is fast, however. Compared to a conventional oven, it's usually less-costly to operate simply because of all the heat that the conventional oven loses, amplified by the longer cooking times. But a microwave around our house is suitable only for warming leftovers, thawing hamburger meat, heating up the butterscotch and maple syrups and popping Orville's best. For true COOKING, the microwave stays off.<p>Dean
Dean Huster, Electronics Curmudgeon
Contributing Editor emeritus, "Q & A", of the former "Poptronics" magazine (formerly "Popular Electronics" and "Electronics Now" magazines).
R.I.P.
Contributing Editor emeritus, "Q & A", of the former "Poptronics" magazine (formerly "Popular Electronics" and "Electronics Now" magazines).
R.I.P.
- Dave Dixon
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Re: energy efficiency
Hi Dean,
I've seen the heating element on an electric stove glow (produce
light). Does that drop the percentage just a hair? Sorry... I just couldn't resist!!
Dave<p>[ October 12, 2004: Message edited by: Dave Dixon ]</p>
I've seen the heating element on an electric stove glow (produce
light). Does that drop the percentage just a hair? Sorry... I just couldn't resist!!
Dave<p>[ October 12, 2004: Message edited by: Dave Dixon ]</p>
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