It’s important to understand the formulas you work with.
A few months ago, a very accomplished hydronic heating professional was looking over some material I had just written for the second edition of the RPA Radiant Precision training manual. He asked me a question that really made me reflect back on all the formulas I’ve put into columns and other publicatons over the years. Formulas that I’ve stressed were important for proper system design. His question was simply: “Where do the constants in the formulas come from?”