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Homework Help: Cylindical heat exchanger

  1. Jun 10, 2006 #1
    I have some problems in resolving this exercise.
    Consider a cylindrical heat exchanger, whose you know all caracteristics (such as : inside diameter, outside diameter and its length). This exchanger is used to cool an oil phase with water.

    We know the flow of water, its Cp and its temperature, moreover we also know the flow of oil, its Cp and its temperature.
    We also know the global transfert coefficient K expressed in kW.m-².K-1

    How can we determine the temperature of oil at the exit of the exchanger?

    Thank you very much.
  2. jcsd
  3. Jun 10, 2006 #2


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    What are your thoughts about the problem at the moment?
  4. Jun 11, 2006 #3
    I don't know how to begin,
    perhaps by computing Q(oil)=m Cp dT but I don't know the mass of oil given that I don't know the time => I can't deduce it from the flow
  5. Jun 11, 2006 #4

    Andrew Mason

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    If you know the flow rate of the oil and of the water, you know dm/dt. How does dQ/dt relate to dm/dt?

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