Could you please teach me some concepts about thermal radiation?
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I have a few concepts to ask you.: 1. Hemispheric space 2. Solid angle 3. Effective air layer thickness 4. Envelope 5. Equivalent cold plane, etc. Can any prawn explain it in simpler terms?
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Hemispheric space: dA radiates in all directions above it. If a hemisphere is made above, all the radiant energy emitted by dA will pass through this hemispheric space, so we call the space above dA a hemispheric space. Solid angle: The part of the space surrounded by a cone is called a "solid angle". The solid angle is measured by the area intercepted by the cone surface with the apex of the cone as the center and the spherical surface with radius 1. The unit of measurement is called "solid radian". Shell: the package of the thermal radiation source, which seals the gas with thermal radiation capability into the shell. Equivalent: scientifically and technically refers to a certain quantity corresponding to a certain standard quantity, such as chemical equivalent, thermal work equivalent, and TNT equivalent of a nuclear device. Equivalent cold plane: The corresponding number of cold planes compared with the standard cold plane. Effective air layer thickness: The thickness of the air layer with thermal radiation capability in thermal radiation