Marine Heat Exchanger Fouling, Cooling Capacity & Cleaning ROI Tool

Measured U-Value Loss, Fouling Resistance, Cooling Capacity, Cleaning Recovery, Temperature Profile & Lifecycle ROI

Marine Heat Exchanger Fouling, Cooling Capacity & Cleaning ROI Tool

Screen whether a marine cooler, condenser or process heat exchanger is losing enough heat-transfer performance to justify cleaning. Simple mode compares clean and current overall heat-transfer coefficients and links the recoverable fouling penalty to cleaning payback. Advanced mode calculates LMTD, measured U, fouling resistance, duty shortfall, post-clean recovery and lifecycle economics across multiple operating conditions.

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Need measured thermal-performance detail? Click Advanced above.Add heat-transfer area, counterflow LMTD, multiple operating points, required duty, post-clean U recovery, pump/compressor energy penalty, thermal-shortfall value, cleaning downtime, degradation and lifecycle NPV.

Fast Fouling & Cleaning ROI Screen

Simple mode assumes current and post-clean duty scale approximately with U under comparable flow and temperature-driving-force conditions. Use Advanced when temperatures and operating conditions vary materially.

Heat exchanger service

Clean / reference overall UW/m²K.

Current measured overall UW/m²K.

Required cooling / heating dutykW.

Current delivered dutykW.

Annual operating hours

All-in fouling operating penaltySelected currency / operating hour, including energy and lost-capacity effects.

All-in cleaning costContractor, chemicals, labor and downtime if desired.

Expected recovery toward clean U% of the current U-to-clean-U gap restored.

Target simple paybackyears.

Exchanger & Clean-Performance Basis

Heat exchanger service

Flow arrangement

Heat-transfer aream².

Clean / reference overall UW/m²K.

Design / nameplate dutykW.

Expected cleaning recovery toward clean U% of measured fouling gap restored.

Current extra pump / fan / compressor powerkW attributed to fouling / restriction.

Extra-power recovery after cleaning%.

Energy costSelected currency / kWh equivalent.

Recovered thermal capacity valueSelected currency / MWh-th recovered up to required duty.

Operating-Condition Register

Measured duty and four terminal temperatures are used to calculate LMTD and measured U. Keep temperatures and duty from the same stabilized operating period.

Condition	Hours / yr	Hot in °C	Hot out °C	Cold in °C	Cold out °C	Measured duty kW	Required duty kW

Cleaning Strategy & Economics

Cleaning strategy

Cleaning contractor / materials

Additional crew / labor cost

Cleaning downtimehours.

Downtime / production valueSelected currency / hour.

Drydock / planned-maintenance credit

Annual benefit degradation after cleaning%/year as fouling returns.

Target simple paybackyears.

Economic horizonyears.

Discount rate%.

Measurement & Cleaning Readiness

Clean/reference U basis verifiedReference comes from commissioning, OEM data or a defensible clean baseline. Temperature instruments validatedTerminal temperatures are measured at suitable locations and sensors are healthy. Heat-duty measurement basis verifiedDuty estimate uses reliable flow/property or energy-balance data. Strainers / valves / bypass condition checkedApparent fouling is not primarily a flow-control or strainer problem. Cleaning chemistry / material compatibility checkedPlates, tubes, gaskets, coatings and metallurgy are compatible with the method. Drain / waste / discharge plan definedCleaning fluids and removed deposits have an approved handling route. Gaskets / seals / plugs / spares availableReassembly risk is covered before opening the exchanger. Post-clean performance test plannedU, duty and approach temperatures will be re-measured after cleaning.

Thermal-performance screening only: this tool does not replace exchanger rating software, OEM cleaning instructions, tube/plate inspection, pressure-drop analysis, seawater-side corrosion assessment, material compatibility review or pressure-boundary inspection. Measured U can be distorted by unstable operation, bad flow estimates, temperature-sensor error, bypassing, air binding or flow maldistribution.

Engineering basis: the tool uses the standard overall heat-transfer relation Q = U × A × LMTD and the screening fouling-resistance relation Rf = 1/Udirty - 1/Uclean. Measured U should be compared only under a defensible operating and instrumentation basis. Alfa Laval recommends checking temperatures and flow against design conditions, monitoring temperature/pressure changes, and using cleaning or performance-audit methods when fouling degrades exchanger performance. Alfa Laval GPHE Maintenance · Alfa Laval Cleaning Guidance

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