BUILDING ENGINEERING CALCULATORS
Free HVAC, ductwork and hydronic sizing tools
Soft Études provides practical preliminary sizing calculators. Sixteen technically reviewed HVAC, ventilation, thermal and hydronic tools are now available in English.
Hydraulic separator and heating manifold
Preliminary sizing of a hydraulic separator, heating manifold, primary and secondary flow rates, pipe connections and main dimensions.
Open calculatorExpansion vessel for heating and chilled water
Estimate the minimum expansion vessel capacity, expansion volume, operating pressures and a standard vessel size.
Open calculatorHeating water flow rate and pipe diameter
Calculate heating water flow rate, theoretical diameter, suggested pipe size and actual velocity.
Open calculatorCircular and rectangular duct sizing
Calculate a circular duct diameter, an equivalent rectangular size and an indicative insulation surface.
Open calculatorAirflow in circular and rectangular ducts
Calculate airflow from duct dimensions and air velocity, and compare circular and rectangular sections.
Open calculatorAir duct pressure loss
Calculate pressure losses by duct section, including linear, fixed and fitting losses.
Open calculatorCirculator selection and operating point
Calculate system flow rate and head, assess a control valve and check the operating point against a manufacturer pump curve.
Open calculatorPlate heat exchanger for heating and cooling
Preliminary plate heat-exchanger sizing with primary and secondary flow rates, LMTD, approach temperature, indicative area and connections.
Open calculatorDirect boiler heating circuit
Preliminary sizing of a boiler supplying one direct heating circuit without a hydraulic separator or manifold.
Open calculatorBoiler cascade preliminary sizing
Check installed output, N+1 redundancy, modulation range, primary flow and a generic component list for a boiler cascade.
Open calculatorHydraulic separation for heat pumps and hybrid systems
Compare primary and secondary flow rates, manufacturer minimum flow, buffer volume and indicative separator arrangements.
Open calculatorWater flow rate and AHU coil duty
Calculate water flow from heating or cooling duty, or sensible air-coil duty from airflow and supply-air temperature difference.
Open calculatorLocal pressure loss using K coefficient
Calculate local pressure loss through a bend, tee, valve or fitting from its K coefficient, flow rate and internal diameter.
Open calculatorHeat loss from circular pipes
Calculate linear heat loss, surface temperature, dew point, condensation or burn risk and indicative annual energy loss.
Open calculatorAHU airflow preliminary sizing
Estimate AHU airflow from air-change rate, occupancy, outdoor-air requirement or sensible cooling duty.
Open calculatorAirside free-cooling potential
Estimate sensible cooling available from outdoor air and compare it with the room sensible load.
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