TECHNICAL TOOLS
Humidity calculations that show the method, inputs, and limits
Calculate the air state first, then compare refrigerant, desiccant, and staged dehumidification routes against the target dew point and operating constraints.
Each result keeps the units and assumptions visible. These tools support an early technical review; they do not replace site measurements, load calculations, or final equipment selection.
ENGINEERING WORKFLOW
Engineering tools for checking moisture conditions and equipment requirements
11
Air changes per hour calculator
Convert ACH, airflow and room volume; distinguish outdoor air from recirculation before sizing.
Inputs: any two of ACH, airflow and volume Open tool → 10Relative humidity calculator
Recover RH from dry bulb and dew point or thermodynamic wet bulb; inspect water content.
Inputs: dry bulb, dew point or wet bulb, pressure Open tool → 09Wet bulb calculator
Calculate thermodynamic wet bulb for evaporative cooling, towers and coil-inlet conditions.
Inputs: dry bulb, RH or dew point, pressure Open tool → 08Dew point chart
Printable Celsius and Fahrenheit lookup tables with an explicit ice/water convention.
Lookup: dry bulb × RH Open tool → 01Dew-point calculator
Calculate dew point, reverse-calculate RH and compare surface temperature in Celsius or Fahrenheit.
Inputs: dry-bulb temperature, relative humidity Open tool → 05VPD calculator and chart
Calculate leaf and air VPD with an adjustable leaf-temperature offset and an interactive temperature × RH chart.
Inputs: air temperature, RH, leaf-temperature offset Open tool → 06Interactive psychrometric chart
Plot two air states and compare moisture and enthalpy changes with pressure correction and SI/IP units.
Inputs: dry bulb + RH, dew point or wet bulb; pressure Open tool → 07Dehumidifier sizing calculator
Estimate room and grow-room moisture loads, compare L/day and PPD, and prepare a condition-specific model review.
Inputs: volume, air states, air changes, internal moisture and crop water balance Open tool → 02Moist-air property converter
Convert one measured air state into vapour density, humidity ratio, specific humidity, vapour pressure, dew point, and enthalpy.
Inputs: temperature, relative humidity, pressure or altitude Open tool → 03Surface condensation risk check
Compare surface temperature with nominal and uncertainty-adjusted dew point, then test a project-defined temperature margin.
Inputs: air state, surface temperature, instrument uncertainty, project margin Open tool → 04Dehumidification technology route comparison
Pre-screen refrigerant, desiccant, and staged routes from the inlet air state, target dew point, load character, and project constraints.
Inputs: inlet and target air states, minimum temperature, load, regeneration, discharge-air limit Open tool →CALCULATION BASIS
The result is useful only when its definitions remain clear
ASHRAE psychrometrics
The property converter and detailed condensation check use ASHRAE water/ice equations. The dew-point tool uses NPL Magnus; the VPD tool uses FAO-56. Each tool explains its own method and limits.
SI units with explicit pressure
Vapour density is reported in g/m³. Humidity ratio is reported in g water/kg dry air. Pressure-dependent results use measured local pressure or standard-atmosphere pressure from altitude.
Uncertainty remains visible
The condensation tool can use temperature and RH uncertainty to calculate a conservative temperature margin instead of treating sensor readings as exact.
Defined engineering boundary
The tools do not model transient heat transfer, infiltration, moisture generation, thermal bridges, controls, weather extremes, or equipment capacity.
REFERENCES
Public calculation references
PROJECT APPLICATION
Need to turn the calculation into an equipment requirement?
Share the measured conditions, target, enclosure or room geometry, moisture sources, airflow, installation limits, and operating cycle.
Discuss the operating conditions