Temperature inside an enclosure
Temperature inside an enclosure
(OP)
Hi,
I have a setup with a hollow steel pipe and a heat source attached to it on its outer surface. The hollow steel pipe has another pipe centralized inside it & it is also sealed off from both ends. A heat flux is provided on the outer surface of the outer pipe to raise its temperature to 200 F.
If I understand this correct, the heat will be transferred to the ID of the outer tube by conduction and then the ID of the outer tube will radiate heat onto the inner tube. Also natural convection will keep the air moving and mixing.
Now, is it possible that the radiation and convection effects can raise the temperature of the inner tube above 200 F? If yes, then what is the driving cause for this? The radiation effects or maybe a rise in pressure due to heat?
Thanks,
Mike
I have a setup with a hollow steel pipe and a heat source attached to it on its outer surface. The hollow steel pipe has another pipe centralized inside it & it is also sealed off from both ends. A heat flux is provided on the outer surface of the outer pipe to raise its temperature to 200 F.
If I understand this correct, the heat will be transferred to the ID of the outer tube by conduction and then the ID of the outer tube will radiate heat onto the inner tube. Also natural convection will keep the air moving and mixing.
Now, is it possible that the radiation and convection effects can raise the temperature of the inner tube above 200 F? If yes, then what is the driving cause for this? The radiation effects or maybe a rise in pressure due to heat?
Thanks,
Mike





RE: Temperature inside an enclosure
What are the ends like? How is the centralization achieved?
RE: Temperature inside an enclosure
This actually happened during our test. The inner tube temp was actually greater (210 F) than the outside tube temperature (200 F). I can't imagine what would cause this.
RE: Temperature inside an enclosure
Do you have any fluid with sharp variations in velocity flowing in the inner tube?
RE: Temperature inside an enclosure
You can ask the same question however you want, but the result is the same; you cannot get something hotter that your source using passive means.
If you can repeatably do this, you need to patent it and sell it as a perpetual power source.
TTFN
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RE: Temperature inside an enclosure
Did you mount TCs on outer pipe? Or, the temp on outer pipe was based on hearsay and assumptions based on experience or something?
Where was the test conducted? In shade, during a rain, in bright sunlight? Look at everything.
In short, IRstuff is right.