What fouling resistances does TEMA specify?

TEMA standards give Rf values: river water = 0.0002 m²K/W, sea water = 0.0001, process streams = 0.0002–0.0009, steam = 0.0001. Fouling can reduce U by 20–40%, requiring equivalent over-surface in the design.

How does fouling affect clean vs service U values?

Uc = clean coefficient; U_s = service (fouled) = 1/(1/Uc + Rf_total). Design must provide extra area: A_design = Q/(U_s × LMTD). Exchangers should be oversized by 20–30% to account for TEMA fouling.

Heat Exchanger Fouling Resistance Calculator

Calculate overall heat transfer coefficient with fouling: 1/U = 1/h_i + Rf_i + Δx/k + Rf_o + 1/h_o. Determine over-surface required for fouling allowance.

2D stress state at a point. All stresses in MPa.

σx — Normal Stress X (MPa)

σy — Normal Stress Y (MPa)

τxy — Shear Stress (MPa)

⚙ Mechanical Note: Results are based on standard textbook formulas and ISO/AASHTO references. Always verify critical designs with applicable codes (ISO 898, AASHTO 1993, AISC, Eurocode 3) and a qualified engineer.

How to Use

Enter the values for the patient or scenario you are assessing. Calculate overall heat transfer coefficient with fouling: 1/U = 1/h_i + Rf_i + Δx/k + Rf_o + 1/h_o. Determine over-surface required for fouling allowance. Use the fouling resistance rf result to inform your clinical assessment.

Heat Exchanger Fouling Resistance Calculator

How to Use

Frequently Asked Questions

What fouling resistances does TEMA specify?

How does fouling affect clean vs service U values?