HVAC engineering tools
Free online calculators for ventilation and air conditioning design. Deterministic maths, no sign-up.
Psychrometric chartPsychrometric (Mollier) chart: from any two parameters — the point and every air property (φ, humidity ratio, enthalpy, wet-bulb, dew point, density), air-handling processes and loads, city design conditions per SP 131.13330.Open →Duct pressure dropAerodynamic calculation of a duct run: specific friction loss R (Pa/m), velocity, Reynolds number, friction factor and pressure drop. Size selection, velocity «traffic light», material comparison, barometric correction.Open →