Rectangular: A=Area=bc. P=Perimeter=2(b+c). D=Hydraulic Diameter=4A/P Annular: A=Area=π(c2-b2)/4. D=Hydraulic Diameter=c-b ReferencesUsing our hydraulic diameter page If you have a non-circular duct, the cross-sectional geometry can be converted to hydraulic diameter using this page...
Note! -due to larger circumference and more friction area related to air volume - a circular duct is always more efficient than a rectangular duct. Make Shortcut to this Calculator on Your Home Screen? . Example - Air Flow in Rectangular vs. Circular Duct ...
Evaluating the use of a carbon footprint calculator: Communicating impacts of consumption at household level and exploring mitigation options. J. Ind. Ecol. 2015, 20, 396–409. [CrossRef] 31. Moser, S.C. Communicating climate change: History, challenges, process and future directions. Wiley ...