maxopus
Guest
a curiosity: I have been wondering for a long time, what is the performance or efficiency of a microwave system? Are microwave ovens more efficient than electric resistors?
If I say so, I'm moving.
If I say so, I'm moving.
Tequila
Guest
Who are you talking about? of the aviator or of the master of the barbecue?:biggrin:
maxopus
Guest
Let's see if he answers... if I tell you, take away the surprise effect
p.s.:
I read that a magnetron has a yield of just over 60%.
p.s.:
I read that a magnetron has a yield of just over 60%.
Fulvio Romano
Guest
I sketch an answer "bottom - up", also not to remove the taste to max to discover the knowledge of its mysterious reference. . .
the thermal performance of a resistance oven is 100%. There is nothing with a higher performance, of course, because from electric to thermal is the maximum degradation of energy. the performance of a transformation is less than the thermal losses, but if the transformation is thermal...the "losses" are null.
from this point of view the performance of a microwave oven is lower.
But this is math, now let's get the engineer's hat back.
You want to heat the water pot. you do not care about the performance of resistance, but the total performance, including the losses of the insulating, the ability to transfer energy to food and blah blah blah. As mentioned, we try a "bottom - up" approach, you have a 2500w microwave and a 2500w electric oven. Put the water pot. This bubbles in five minutes in the microwave and in twenty minutes in the electric one, ergo, the overall performance of the microwave is better.
Please check the times, because I made them up, but I hope I didn't go too far.
the thermal performance of a resistance oven is 100%. There is nothing with a higher performance, of course, because from electric to thermal is the maximum degradation of energy. the performance of a transformation is less than the thermal losses, but if the transformation is thermal...the "losses" are null.
from this point of view the performance of a microwave oven is lower.
But this is math, now let's get the engineer's hat back.
You want to heat the water pot. you do not care about the performance of resistance, but the total performance, including the losses of the insulating, the ability to transfer energy to food and blah blah blah. As mentioned, we try a "bottom - up" approach, you have a 2500w microwave and a 2500w electric oven. Put the water pot. This bubbles in five minutes in the microwave and in twenty minutes in the electric one, ergo, the overall performance of the microwave is better.
Please check the times, because I made them up, but I hope I didn't go too far.
Tequila
Guest
What are you doing here:biggrin: !!! Did you start writing the documentation of robots?? If you don't remember I'll send you back to this thread.. :biggrin: http://www.cad3d.it/forum1/showthread.php?t=31830&page=2apart from this I agree, with the microwave the food warms up/hearts in less time than in the normal oven even if electric, this because in the microwave the water molecules contained in the drinks foods etc. are shaken as the example of the pot, if I put a cup of water (also milk or coffee) in the microwave in 1 minute is more than hot while on the other it takes more time, so also for me the microwave.
Fulvio Romano
Guest
Of course... if I put a gold in the microwave oven, after half a day it is still at room temperature.
and anyway, before criticizing... take a ride on the forum!:finger:
and anyway, before criticizing... take a ride on the forum!:finger:
Tequila
Guest
true, I forgot to say that it is only good for foods/drinks/human beings where there is a percentage of water. If you heat only the cup is just wasted electricity.
I didn't criticize, it was just a joke, I actually put the faces...
maxopus
Guest
I could not be wrong
Tequila
Guest
Okay, like I said... I only saw now that you opened the thread "the humble servant", only that from my intervention to your there were just 5 minutes of difference :biggrin: :mixed:
MBT
Guest
we are making a comparison that is possible only in part, because microwave by definition "works" only with foods that have a watery, lipid or glucose base. a carbonized food, for example, would not be conveniently heated by the microwave. a metal reflects microwaves.
magnetron performance is actually low. we say that a classic microwave with 900w of "microwave" power absorbs an electric 1500w. 60% of return is more or less respected.
what makes the difference (and convenience) is the use time of microwave.
as rightly points out fulvio, a conventional oven takes time to warm up and time to heat the content. in the microwave this does not happen, so at the end of the accounts it is still beneficial despite the performance.
magnetron performance is actually low. we say that a classic microwave with 900w of "microwave" power absorbs an electric 1500w. 60% of return is more or less respected.
what makes the difference (and convenience) is the use time of microwave.
as rightly points out fulvio, a conventional oven takes time to warm up and time to heat the content. in the microwave this does not happen, so at the end of the accounts it is still beneficial despite the performance.
MBT
Guest
Who is the master of bbq????
MBT
Guest
He's warming up.
has a percentage of moisture and lipids and sugars that absorb microwaves.
a piece of burnt cake would not warm up (or however to an irrisoria extent). .
maxopus
Guest
It's right on the water I care about
MBT
Guest
Now I understand...It's right on the water I care about
bhe, as I wrote you above, the comparison becomes complicated.
microwave makes little, but it acts directly in the "heart" of matter, dramatically reducing intervention times.
One thing must be said at the disadvantage of microwave.
being electromagnetic waves, you have to shield them. In fact, microwave is a pharaoh cage with a magnetron inside.
I don't think it works well for continuous processes.
and to protect the operator not enough a bit of caowool or a sticker "hot surfaces, do not touch!"
19marco77
Guest
but do they heat up even if they are empty?
I thought they only warmed up for thermal conduction resulting from the content. . .MBT
Guest
He... maybe! :biggrin:
I'm just a little more than a loser! :redface:
Tequila
Guest
Yes, they heat up first for the heat released from its content, but being also these materials with a minimum aqueous percentage not entirely evaporated inside them, if these are "microwave heating" if empty, increase the temperature even if it is difficult to feel it at the touch.but do they heat up even if they are empty?
ps: if you cook the microwave egg, use the special egg container if you don't want to throw all the microwave in the bottle.
MBT
Guest
generally you...but do they heat up even if they are empty?
but if the material is poor (moisture residual) or with contents that absorb microwaves, they heat themselves
known easily
if the cup is of good quality, when you use it to heat a liquid you will find the hot liquid, the lukewarm cup (for conduction) but the cold handle
if the handle is hot.... :frown: