Surface Coefficients - shell & tube design 1

[iken]

Hi, I'm relatively new to the heat transfer side of engineering, and are currently in the process of developing a method for shell and tube heat exchanger design/selection (hopefully this will be excel based).

What I'm having trouble obtaining is the surface coefficients for both inside and outside of the tube (hsi and hso). This has the greatest effect on the overall heat transfer from one medium to the other. I understand these values vary with the velocity of water, temperature, vertical or horizontal tubes, tube dia etc, and are left wondering if there is any good reference material which tabulates this data that has been derived through experiment.

I have recently bought CIBSE guide "C", which begins to cover this but fails to cover coils (this guide details straight lenghts only). Would it be safe to assume the heat transfer coefficients would be the same?

Any advice on good reference books etc would be greatly appreciated.

Many thanks

iken

 

[corus]

For heat transfer coefficients inside and outside of tubes refer to McAdams or Spiers technical data on fuel. The coefficient will depend on whether or not it is turbulent flow. McAdams gives a simplified expression for water in a tube which takes into account the change in properties with temperature. I'm not sure that there's a difference in whether the tube is horizontal or vertical in terms of water inside the tube. If there is cooling to air outside then it will have an effect. As for coils, I'm not sure as there may be greater flow on the inside radius of the coil which would have an effect.