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Originally posted by Since87
My impression is that working with thermal resistances rather than surface areas and convection coefficients is much more practical. Temp gradients across surfaces and localized variation in convection make the whole problem blow up. We're very unlikely to have a significant amount of data in 'hA' form anyway.
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Actually, BillA's C/W term is the same thing as 1/hA. The heat transfer coefficient h is in terms of heat flux per degree temperature. Adding the area term and treating "hA" as a single variable removes all dependence on area.
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Yes, pelts definitely need to be left out for the forseeable future. 'Creeping featurism' is one of the leading causes of project death. We need to keep this things within reasonable bounds.
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We'll put those in version 2.0
As for the equation solver, the function we need to solve - the pump curve minus the added PQ curves for all components - will pretty much be a very slightly curved line crossing the y-axis at somewhere near 1/2 to 2 gpm, so we can set particular bounds and probably run a Newton's method until we get a y-value of 0.001 or something like that, and take that Q value.
Of course, I'm sure gmat and others would know more about what methods are best in whatever they're programming in.
Alchemy