Preliminary balance for a multiple-effect evaporator (forward feed): water removed from the feed/product concentration ratio, live-steam demand from the steam economy (approx 0.8N rule of thumb), the temperature-difference split across effects, and a rough per-effect and total heating area.
Inputs
| Parameter | Notes |
|---|---|
| Effects N (1-6) | Number of effects |
| Feed rate (kg/h) | Dilute feed |
| Feed & product conc. (wt%) | Sets water removed |
| Steam & last-effect T | Total delta-T |
| U, latent heat | Heat transfer & lambda |
Outputs
| Output | Basis |
|---|---|
| Water evaporated (kg/h) | From concentration ratio |
| Steam economy & live steam | approx 0.8N or user |
| delta-T per effect | Equal split |
| Heating area (m2) | Per effect & total |
Standards & Method
Forward-feed multiple-effect mass and energy balance with steam economy approx 0.8N (per Perry Chemical Engineers Handbook section 11). Add boiling-point elevation, flash and feed preheat for detailed design.
Open the Multiple-Effect Evaporator Calculator →
Screening-level preliminary calculation. Verify against project standards and vendor data before engineering use.