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Michael Ross, bonsoir

I sort of like your approach. Calculation conditions, testing conditions and actual conditions are not the same. In particular, the velocity profile in a channel that...

Wmech, bonsoir

It pleases me that you guys are using Q_dot and m_dot as variables. The “dot” is a time derivation so Q_dot=[Joules/s] =[Watt] and the m_dot=[kg/s]. During my studies, and this is...

Wmech, bonsoir

Watch out here, there are numerous definitions of dT. One is the difference between air_out and air_in which should be used in the energy equation Q_dot = m_dot * cp * dT.
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Wmech, bonsoir

I sort of believe that you are on the right trace but lets get more profound.

The 60 000 BTU/h is a power. Is it generated by some kind of electrical coil or by a heat...

The material issue is just one of many that determine the qualities of a good a heat sink. There are lots of compromises to be made. Not at least the ability to form optimum fins at a convenient...

This is what I would do. It is a little bit swingy but after all you are asking for an estimate.

The only air property that has an impact on convection at high pressures is the density. The...