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.
REF-04
Duct & Pipe Fitting Loss
Reference: ASHRAE DFDB & Crane TP-410
ΔP=ΣK·
ρV22
K: resistance coeff. · ρ: density · V: velocity
Calculates localized minor losses in duct and pipe fittings using K-factor resistance coefficients.
REF-05
Pool Evaporation & HVAC
Reference: DIN 19643 & ASHRAE Ch. 6
Wp=A·F·(Pw - Pa)
A: area · F: evap. factor · Pw: water vapor pressure · Pa: air vapor pressure
Calculates water surface evaporation rate and natatorium dehumidification capacity to maintain negative pressure and IAQ.
REF-06
Cold Storage Heat Load
Reference: ASHRAE Refrigeration & USDA AH-66
Qtot=Qtr+Qpr+Qinf+Qmisc
tr: transmission · pr: product pull-down · inf: infiltration · misc: motors/lights
Comprehensive 24-hour industrial cold storage heat load breakdown: transmission, product, infiltration and miscellaneous loads.
