Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Heat transfer - generator losses and dissipation

  1. Jul 22, 2011 #1
    I am currently working on a small personal project.

    It is a small under-water generator/ motor so the setup is as follows. The generator and gearbox are mounted on steel struts within an air-tight nacelle of sorts which is cylindrical and made of steel. The nacelle is submerged in cold water which will be flowing past. I am trying to calculate the heat within the nacelle and what natural cooling will occur knowing only material properties, dimensions and generator and gearbox losses. I am struggling to generally work out how to go forward and work out the temperatures over time. Any help would be great.
  2. jcsd
  3. Jul 22, 2011 #2
    Your heat loss from the surface of the nacelle is:

    q loss = h A (Ts - Twater)

    q loss = heat loss
    h = convenctive heat transfer coefficient (more on this below)
    A = surface area of nacelle
    Ts = temperature on surface of nacelle
    Twater = average water temperature

    Try figuring h from a natural circulation correlation for a vertical cylinder. You can attack this with the Chruchhill and Chu, LeFevre and Ede, or Yovanovish correlation.

    If you figure your q-loss from gearbox data, you find find out how hot your nacell will get by figuring Ts.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Threads - Heat transfer generator Date
Heat Transfer through multiple walls Feb 28, 2018
How to use TSRES command in Ansys APDL Feb 10, 2018
Engine Finite Heat Release Model (With Heat Transfer) Help Feb 5, 2018