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I've always thought that the following was true but posts in another thread lead me to believe I might have a fundamental misunderstanding. The other thread was a different topic and I didn't want to hijack it, so here's my question.
What I THOUGHT was true but am not now sure about: an object is the only thing inside a room. It's magically off the floor so no conduction and I've sucked all the air out of the room, so no convection. The body is at 300 degrees Kelvin. All the surfaces of the room are at 350 degrees kelvin. My belief has been that the body radiates and the walls radiate and because the walls are hotter, they radiate MORE, so the net result is that the body absorbs some head from the walls and it gets hotter and the walls get cooler. By exactly what amounts is not relevant.
What I gathered from the other thread is that the only radiation is the NET radiation. That is, in this situation, the body does not radiate at all. The walls radiate until both the walls and the object are the same temperature.
I'd appreciate it if someone who knows what they're talking about, as I apparently don't, could clarify this for me.
Thanks
What I THOUGHT was true but am not now sure about: an object is the only thing inside a room. It's magically off the floor so no conduction and I've sucked all the air out of the room, so no convection. The body is at 300 degrees Kelvin. All the surfaces of the room are at 350 degrees kelvin. My belief has been that the body radiates and the walls radiate and because the walls are hotter, they radiate MORE, so the net result is that the body absorbs some head from the walls and it gets hotter and the walls get cooler. By exactly what amounts is not relevant.
What I gathered from the other thread is that the only radiation is the NET radiation. That is, in this situation, the body does not radiate at all. The walls radiate until both the walls and the object are the same temperature.
I'd appreciate it if someone who knows what they're talking about, as I apparently don't, could clarify this for me.
Thanks