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Recent content by Igor D

  1. I

    Heat Transfer with the sea

    Thanks! I think if the calculations are correct, then my final question is: For the graph above, considering each segment is 20m (as per spreadsheet), then each point of that curve is the final steady state temperature of the fluid inside the pipe flowing at the fixed rate (assumed on the...
  2. I

    Heat Transfer with the sea

    Hi, For this exercise, I have split the interval in 33 segments of 20m each. I have calculated U using the "cylinder model": R = 1 / 2 . Pi . ri . L . H (convection for fluid inside pipe and seawater) R = ln(re/ri) / 2 . Pi . L . K (conduction for the pipe) Rt = 0.000117 Then, I calculated Q...
  3. I

    Heat Transfer with the sea

    Thanks, I am working your first paragraph and have a doubt: shouldn`t we use mass flow rate instead of mass on the equation q=m*cp*dt? And if I do use kg/s, then on that same equation q becomes J/s doesn`t it? If both statements are correct, then how do I use the q calculated on the first...
  4. I

    Heat Transfer with the sea

    Hi, thanks for all the replies and specially for your patience with my ignorance. @Snickster suggested to use a series of 3 coefficients to have a single U and break down into smaller sections. But my lack of experience with this type of problem is confusing me. 1. For simplificatiom, I...
  5. I

    Heat Transfer with the sea

    Hello, Thanks for the reply, I don`t think I care if this is a transient analysis, but because the sea temperature varies with depth, I don`t know how to calculate for the entire length, thus the iteration seems the way to go. Another point that creates confusion for me, because of my...
  6. I

    Heat Transfer with the sea

    Greetings from Brazil, I am trying to build a spreadsheet to estimate how cold a fluid would be at the end of a pipe. This non-insulated steel pipe (let`s say ~3000ft long), would be vertical in the sea, from surface to sea bed. At surface a pump would pump down, with a certain constant flow...
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