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roaling (surely you're right), i've also considered only heat conductivity and numerical results (inox-air-c.steel) differed less than 10% with a deltaT= 25ºC as i really considered h(air)=17 W/m2K j

sorry roaling... i looked for natural-convection coefficients in enclosed spaces (Perry 7th 5-13) but my case was out of range... so i use a 50 W/m2K coefficient as a very conservative value (between 10-50W/m2K are reasonable values, i think :P) however the heat resistance in the soil is the...

yes, the tank is jacketed (double wall) i've already take it into account in my calculations, i fixed constant inner temperature, evaluating heat conduction across inox wall, intermediate natural turbulent convection (air chamber) and conduction across carbon steal and coating.... and now the...

thanks, i'll drop you a later at night j

thanks 25362, these are the same formulas proposed on Perry's handbook. but what happens in a spiral pipe with a increasing/decreasing diameter? thanks j

I need to evaluate heat loss in an uninsulated underground (1 m) tank (20 m3) due to freezing problems. I have some values for apparent thermal conductivity for different soils based on soil type and moisture content, but I don't know how to estimate the equivalent thickness to calculate the...

I have a tank bottom's spiral jacket and I need to estimate the pressure drop for water flow. I looked in Perry's: "the pressure drop for flow in spirals es discussed by Srinivasan...." but there is no formula and I'm not able to found it in any article. Could anyone help me? thanks in...