Re: [Vo]:Manifold mispositioning makes measurements meaningless

[Alan J Fletcher]

http://www.engineeringtoolbox.com/overall-heat-transfer-coefficients-d_284.html

water-copper-air is 13.1 (W/m² K)
steam-copper-air is 17

And for flowing  water/steam, I think that the MASS flow is what counts, not the volume flow, so there isn't a big transferdifference between the two.