What does EnerTherm Engineering do?

EnerTherm Engineering is a UK-based industrial engineering company that designs and delivers thermal process solutions, energy auditing services, and bespoke thermal equipment for manufacturing and process industries. Services include energy audits, pinch analysis, process modelling, thermal design simulation, and project management.

What thermal products does EnerTherm Engineering manufacture?

EnerTherm Engineering manufactures process heaters, heat exchangers, thermal oxidisers, incinerators, condensers, dehydrators, and the Omni Vision industrial energy intelligence platform. All products are custom-designed for specific industrial applications and process requirements.

Does EnerTherm Engineering provide energy auditing services?

Yes. EnerTherm Engineering provides comprehensive energy audits, heat loss audits, and pinch analysis to identify energy waste, quantify potential savings, and prioritise capital investments in industrial facilities across sectors including chemical, pharmaceutical, food & beverage, and manufacturing.

What industries does EnerTherm Engineering serve?

EnerTherm Engineering serves chemical processing, pharmaceutical, food & beverage, oil & gas, power generation, automotive, textile, paper & pulp, general manufacturing, waste management, agriculture, healthcare, and mining & metals industries.

Where is EnerTherm Engineering located?

EnerTherm Engineering is headquartered in the United Kingdom and provides engineering services and thermal equipment to clients internationally.

Can EnerTherm Engineering help with industrial decarbonisation?

Yes. EnerTherm Engineering specialises in waste heat recovery system design, process optimisation for energy reduction, and net zero carbon roadmapping. They also provide ISO 14001 and ISO 50001 compliant energy management strategies.

does EnerTherm Engineering offer CFD simulation and thermal modelling?

Yes. EnerTherm Engineering provides Computational Fluid Dynamics (CFD) and Finite Element Analysis (FEA) for thermal equipment design. These simulations validate heat transfer performance before fabrication, reducing costly physical prototyping.

What is a thermal oxidiser and does EnerTherm Engineering supply them?

A thermal oxidiser is an industrial system that destroys volatile organic compounds (VOCs) and hazardous air pollutants (HAPs) through controlled high-temperature combustion. EnerTherm Engineering designs and manufactures regenerative, recuperative, and direct-fired thermal oxidisers for chemical, pharmaceutical, and manufacturing industries.

Does EnerTherm Engineering design custom process equipment?

Yes. EnerTherm Engineering provides bespoke engineering design of process vessels, heat exchangers, reactors, and thermal treatment systems from concept through to fabrication-ready drawings, as well as rapid prototyping and pilot plant commissioning.

What is EnerTherm Engineering's Omni Vision platform?

Omni Vision is EnerTherm Engineering's industrial energy intelligence platform. It provides turnkey utility metering, CO2 tracking, and AI-powered production KPI intelligence for industrial compliance monitoring and operational optimisation.

←All calculators

[Forced Convection]

Free tool

Flat Plate — Isothermal

Average h and heat rate from an isothermal flat plate in free-stream flow.

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Part of EnerTherm's free calculator suite — the same methods we use on live industrial projects.

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In turbulent flow h scales with velocity to the power 0.8 — doubling the air speed buys you roughly 75% more heat transfer, not double.

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Results are indicative

Figures assume typical conditions and the stated method. For measured, guaranteed numbers on your plant, our engineers run site surveys, heat loss audits, and full process models.

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Flat Plate in Forced Convection — Isothermal

Calculates the average convective heat transfer coefficient and total heat rate for a flat plate held at a uniform surface temperature in a uniform free-stream flow. The correlation automatically switches between laminar and mixed (laminar–turbulent) regimes based on the Reynolds number.

Film Temperature

Fluid properties are evaluated at the film temperature:

T_{f} = \frac{T _{s} + T _{\infty}}{2}

Reynolds Number

R e_{L} = \frac{ρ U L}{μ} = \frac{U L}{ν}

Nusselt Number

For laminar flow (Re_L < 5 × 10⁵):

N u = 0.664 R e_{L}^{0.5} P r^{1/3}

For mixed (laminar–turbulent) flow (Re_L ≥ 5 × 10⁵):

N u = (0.037 R e_{L}^{0.8} - 871) P r^{1/3}

The constant 871 accounts for the laminar leading-edge section before the turbulent boundary layer develops.

Heat Transfer Coefficient and Heat Rate

h = \frac{N u \cdot k}{L}

Q = h \cdot A \cdot (T_{s} - T_{\infty}), A = L \times W

Validity

Prandtl number range: 0.6 – 50 (gases and light liquids).
Not suitable for liquid metals (Pr ≪ 1) or heavy oils / silicones (Pr ≫ 50).

References

Schlichting, H., Boundary Layer Theory, 7th ed., McGraw-Hill, 1979.
Schultz-Grunow, F., Luftfahrtforschung, vol. 17, p. 239, 1940.
Holman, J.P., Heat Transfer, 7th ed., McGraw-Hill, 1990.

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Frequently asked questions

Average h and heat rate from an isothermal flat plate in free-stream flow. Enter your inputs and press Calculate — the worked solution shows every step of the method with your numbers substituted in.

Fluid properties like viscosity and conductivity change strongly with temperature, so correlations specify evaluating them at the film temperature — the average of the surface and free-stream (or wall and bulk) temperatures. The calculator does this automatically through its built-in property database.

The underlying correlations are empirical fits to experimental data; ±10–25% is typical depending on geometry and Reynolds range. Treat the outputs as sizing estimates — for guaranteed numbers on a specific piece of plant, measurement or validated CFD is the next step.