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.

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[Natural Convection]

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Vertical Plate — Isothermal

Average h and heat rate from an isothermal vertical plate in natural convection.

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Orientation alone can halve your cooling: the same plate at the same ΔT convects about twice as well with its hot face up as with its hot face down.

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Vertical Plate in Natural Convection — Isothermal

Calculates the average convective heat transfer coefficient and total heat rate for a vertical plate held at a uniform surface temperature in an otherwise quiescent fluid. Buoyancy drives a free-convection boundary layer up the heated face. The plate is assumed to exchange heat from one side only.

Rayleigh Number

Fluid properties are evaluated at the film temperature $T_{f} = (T_{s} + T_{\infty}) /2$ . The Rayleigh number uses the plate height as the characteristic length:

R a_{H} = \frac{g β ( T _{s} - T _{\infty} ) H ^{3}}{ν α} = \frac{g β ( T _{s} - T _{\infty} ) H ^{3} P r}{ν ^{2}}

where $β$ is the volumetric thermal expansion coefficient, $ν$ the kinematic viscosity and $α = ν / P r$ the thermal diffusivity.

Nusselt Number (Churchill–Chu)

For the laminar regime ( $R a_{H} < 1 0^{9}$ ):

N u = 0.68 + \frac{0.670 R a _{H}^{1/4}}{[ 1 + ( 0.492/ P r ) ^{9/16} ] ^{4/9}}

For the turbulent regime ( $R a_{H} \geq 1 0^{9}$ ) the all-regime form is used:

N u = {0.825 + \frac{0.387 R a _{H}^{1/6}}{[ 1 + ( 0.492/ P r ) ^{9/16} ] ^{8/27}}}^{2}

Heat Transfer Coefficient and Heat Rate

h = \frac{N u \cdot k}{H}, Q = h A (T_{s} - T_{\infty}), A = H W

Validity

Valid across the full laminar-to-turbulent range of Rayleigh numbers.
Applies to gases and liquids with Prandtl numbers from roughly 0.01 upward.

References

Churchill, S. W. and Chu, H. H. S., Correlating Equations for Laminar and Turbulent Free Convection from a Vertical Plate, Int. J. Heat Mass Transfer, 18, 1323, 1975.
Incropera, F. P. and DeWitt, D. P., Fundamentals of Heat and Mass Transfer, eqs. 9.26 & 9.27.

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Frequently asked questions

Average h and heat rate from an isothermal vertical plate in natural convection. Enter your inputs and press Calculate — the worked solution shows every step of the method with your numbers substituted in.

When there is no fan, pump or significant draught — enclosures, outdoor surfaces on still days, passive heat sinks. If there is any imposed flow, compare the two mechanisms: when Gr/Re² is well below one, forced convection dominates and the forced-convection calculators are the right tools.

No — it computes the convective part only. At typical natural-convection coefficients of 2–10 W/m²·K, radiation from a painted or oxidised surface is often the same order of magnitude, so total heat loss should add a radiative term from the Radiation calculators.