Home/Drying Time Calculator
Free Engineering Tool
Vacuum Drying Time Calculator
Estimate how long a jacketed mixer/dryer will take to dry your product — from bulk density, moisture content, product temperature limit and vacuum level. Built on contact-drying heat-transfer physics (U·A·ΔT/λ), the same first-pass calculation our applications engineers use before a trial.
Inputs · Your Product & Machine
Estimate Your Drying Cycle
The Physics
How This Calculator Works — And Where It Stops
Contact drying is heat-transfer limited: water leaves as fast as the jacket can push heat into the bed. The evaporation rate is U · A · ΔT / λ — the wall heat-transfer coefficient, the heated area, the temperature difference between your product limit and the boiling point at the operating pressure, and the latent heat of vaporisation. Vacuum wins because it moves the boiling point: at 30 mbar water boils near 24 °C, so even a 60 °C product limit leaves a strong driving force.What It Models
Sensible heat-up, constant-rate drying at the boiling point, and a falling-rate tail below ~8% moisture at reduced flux. Heated area scaled from vessel volume; wall coefficients from agitated vacuum-dryer practice (60–125 W/m²K).What It Can't Know
Your material's critical moisture, bound-water behaviour, stickiness through the drying curve, foaming, and vapour-line limits. These move real cycles ±30–50% against any calculation — ours or anyone's.How We Close the Gap
A pilot trial measures your actual drying curve — evaporation rate, endpoint, product temperature profile — and the measured cycle is written into the machine order as acceptance criteria.FAQ