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Can anyone tell me where I could find out how many btuhs a foot of finned tubing will absorb. Im not looking for how many it will give out (prox 550 per foot)

Im looking to run finned tubing in an area in an effort to absorb heat from the surrounding air to raise the temp of the liquid, maybe from a starting temp of 35F to maybe 45-50F


  • Jean-David Beyer
    Jean-David Beyer Member Posts: 2,666
    You must know the temperature difference ...

    ... between inside and outside of the finned tube. If the tube were in a room at 180F, and the water in the tube were at 65F, you could expect the same 550 BTU/hr/ft. But of course the room is not that hot. All this assumes one gallon per minute.

    With water at around 50F and a room temperature of 165F, you would get the same.

    I have a chart for some Slant/Fin that gives out 570BTU/hr/ft at 115F difference. At 45F difference it puts out about 150 BTU/hr/ft.

    So to get 50F water out, you would need a room temperature of 95F.
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