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## A Practical Application Of The Stefan-Boltzmann Law

The Stefan-Boltzmann law has to do with the radiation of dark bodies, Wein’s law and other concepts related to heat radiation (infrared) and other types of electromagnetic radiation, among other abstract concepts. All of this is well documented and can be viewed online.

This article is about a simple, completely new application used to keep your enchiladas (I mean your food) warm:

Ceramic microwaveable HEAT RETENTIVE PLATE or heat retention plate what do you prefer?

What happens if you seal a disk of microwave-efficient material in a compact microwave-safe cavity such as ceramic and heat it in a 1200 Watts microwave oven for say… one minute?:

That projection disc will be very hot and will glow in the infrared wavelengths (if it is too hot (like red heat) it will glow in the visible part of the electromagnetic spectrum. Fortunately we can control the preheating time).

Now let’s say that the disk that I will call the heater is in small contact with the walls of the pipe (separated by pointed heads), if the hole is sealed while it is hot it will create a semi vacuum, so the heat loss will be mainly. in terms of radiation because a semi vacuum will reduce heat loss by conduction.

Now, since the hole is so tight, part of the heater’s radiation will be reflected and the inside of the hole (or interior) will reach a temperature very close to the temperature of the “hot body” (heater). ).

According to the Stefan-Boltzmann formula, the power dissipated is equal to the output multiplied by Stefano’s constant, multiplied by the area, multiplied by – here’s the good part – the temperature difference of the heater removes the surrounding heat, both to the fourth power (in Kelvin degrees).

Bottom line:

The temperature difference has a large load (or weight) in the formula because it is to the fourth power. Heater radiation will be prevented, If this heat storage device is included in the design of the ceramic plate, your food will stay hot.

The heater discharge and absorption coefficient of the pipe walls can also be adjusted for better control.

How to keep the plate from cracking due to thermal damage is another story I solved the problem. For more information see HEAT RETENTIVE PLATES online.

Anyway, I invented them.

Juan J. Ramirez

El Paso, TX

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