REF-01
Core Physics Engine
Reference: Darcy-Weisbach Equation
hf=f·
LD·
V22g
f: friction factor · L: length · D: diameter · V: velocity · g: gravity
Governs friction-loss modelling across the app's airflow and hydronic physics core.
REF-02
Duct Sizing Engine
Reference: ASHRAE / Huebscher Equation
de=1.30·
(a·b)0.625(a+b)0.250
a, b: duct side dimensions · de: equivalent round diameter
Converts rectangular ducts to equivalent round diameter for optimized, low-friction ductwork.
REF-03
Pipe Sizing Engine
Reference: ASHRAE Fundamentals, Chapter 22
Δp=f·
LD·
ρV22
ρ: density · Δp: pressure drop · per ASHRAE Fundamentals, Ch. 22
Hydronic pipe sizing and allowable pressure-drop limits per ASHRAE guidance.
