References
- H. Obana, Heat Exchanger Design Handbook, upper volume, Petroleum Industry Press, 1st ed., 1982, Chapter 9 (fouling factors, pp. 419–427).
- TEMA fouling factors (cited in Obana; modern cross-check: TEMA standards RGP fouling resistance tables).
Model assumptions
- Time unit is the engineering month (30 d) as in the handbook worked example.
- Fouling resistance default unit h·m²·°C/kcal matches the 1982 worked tables; SI m²·K/W is available in unit pickers.
- Uf = 1/r is the fouling-resistance reciprocal only — not Uc or Ud from Eq. 9.1–9.2 unless you combine externally.
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FAQ
- Why do results differ from reading Fig. 9-1?
- The chart is a graphical solution of the same exponential law. Closed-form evaluation avoids interpolation and reading error; differences of tens of percent have been observed on sample points.
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