Evaporator Design Calculator
Design a single-effect evaporator: calculate evaporation rate, steam requirements, heat duty, and required heat transfer area.
Inputs
kg/hr
mass fraction
mass fraction
kPa
°C
kW/(m²·°C)
Results
Evaporation Rate
4,000 kg/hr
Steam Required
4,000 kg/hr
Heat Duty9,040,000 kJ/hr
Required Heat Transfer Area167,028.5 m²
Steam Economy1 kg/kg
How to Use This Calculator
- Enter the Feed Rate in kg/hr, the Feed Concentration, and the Product Concentration as mass fractions — these define the evaporation duty.
- Enter the Steam Pressure in kPa supplying the evaporator heating side.
- Enter the Boiling Point Elevation in °C due to dissolved solids — reduces the effective temperature driving force.
- Enter the Overall Heat Transfer Coefficient (U) in kW/(m²·°C) — typical range 1–5 kW/(m²·°C) for aqueous solutions.
- Read the Evaporation Rate and Steam Required in kg/hr to size utilities, and the Required Heat Transfer Area in m² for vessel specification.
- Check the Steam Economy (kg evaporated per kg steam) — values near 1.0 are typical for single-effect; multiple-effect designs achieve 2–5.
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