Phase-change vs no-phase-change?

Phase-change uses shell steam condensation correlations with optional non-condensable derating. No-phase-change uses forced-convection shell-side ho with manual shell fluid properties.

Why are some rows hidden on the free tier?

Derived geometry, fouling breakdown, shell condensate props, tube-side Re/Pr/h branches, and the full 1/U expansion match the plant Excel template and require a Pro unlock. After Calculate, licensed users see every row in handbook order with formula/selection notes.

Double-Pipe Heat Exchanger HTC — Alumina Digestion Casing

Standards & handbook references

TEMA-2019 (Chinese translation) — condensation and exchanger practice (provenance).
Plant alumina pipe-digestion HTC calculation sheets (provenance).
Related workflow: /tools/steam-calculator — saturation checks for shell-side steam.

Model assumptions

Default presets cover phase-change (steam condensing on shell) and no-phase-change (sensible shell-side) alumina digestion cases.
§3 fouling uses geometry-based r_w = D₁ ln(D₁/D_i)/(2λ), scaling r_i = δ_i/κ_i, and a direct shell-side r_o input — not the falling-film fixed fouling presets.
UTC counts parallel unit trains from one split stream; use 1 when there is no split flow.
Derived rows before the final U section (§2–7 with phase change, §2–8 without) fold by default; licensed users expand per section. Free tier keeps inputs and primary results only (§8 U/HTC with phase change, §9 U without).

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Frequently asked questions

Phase-change vs no-phase-change?: Phase-change uses shell steam condensation correlations with optional non-condensable derating. No-phase-change uses forced-convection shell-side h_o with manual shell fluid properties.
Why are some rows hidden on the free tier?: Derived geometry, fouling breakdown, shell condensate props, tube-side Re/Pr/h branches, and the full 1/U expansion match the plant Excel template and require a Pro unlock. After Calculate, licensed users see every row in handbook order with formula/selection notes.

Extended copy on this page (headings, references, assumptions, FAQs) may be drafted or localized with AI assistance; engineering judgment and governing codes still apply. Numerical models run locally in your browser as implemented. For contract-critical work, cite primary standards and qualified review.