Heat transfer from uninsulated tank 1

[chemstar]

Hi!
Can anyone lead me in the right direction to determine the heat loss from an unisulated cylindrical heavy oil tank 36 m diamter and 16 m height? The calculation involves evaluating at maximum wind velocity of 100 mi/hr. The goal is trying to maintain 50 degree C oil in 10 degree C outside temp with max wind velocity.
I assume that the forced convection term would be the most important in evaluating the 100 mi/hr wind, but my calcs don't seem reasonable.
Can anyone help?
I appreciate all leads!

Thanks

 

[TD2K]

The 100 mph would be a reasonable criteria for designing the foundations but I think it's unreasonable to use that for heat loss purposes.

15, 20 or even 30 mph, depending on your area and typical range of wind speeds, would seem a lot more reasonable to me.

You need to estimate the inside film coefficient for the oil to the tank metal wall which I assume would be in natural circulation. You then calculate the outside film coefficient with the wind effect, calculate the effective overall heat transfer coefficient and estimate the heat loss.

 

[BigInch]

Sounds completely unreasonable. Get the nearest weather station data that has wind speeds. They'll have the average for the year. Trick is finding it. I've seen it somewhere, try NOAA if you're in the US or the UN Environmental Program if elsewhere

Maybe its here,

http://www.grid.unep.ch/data/data.php?category=atmosphere

or here,

http://www.meteotest.ch/en/wwatlas

I don't think the average should be much more than 17-23 mph.

then do like TD2K says.


Going the Big Inch!

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