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

[Natural Convection]

Free tool

Horizontal Cylinder — Isothermal

Average h and heat rate from an isothermal horizontal cylinder in natural convection.

[FREE_TOOLS]

Built by our engineers

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

[EXPLORE]

More tools, always free

Instant results in your browser, no sign-up. New calculators added regularly.

Browse all calculators→

[FIELD_NOTE]

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.

[LIVE_TOOL]Results update as you type

[READ_THE_NUMBERS]

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.

[NEXT_STEP]

Send us the result — we'll tell you what it means for your plant.

[ABOUT_THIS_TOOL]

Horizontal Cylinder in Natural Convection — Isothermal

Calculates the average convective heat transfer coefficient and total heat rate from a long, isothermal horizontal cylinder in a quiescent fluid. The Churchill–Chu single-cylinder correlation spans the full laminar-to-turbulent range. The ends of the cylinder are treated as adiabatic, so only the lateral surface participates.

Rayleigh Number

Properties are evaluated at the film temperature $T_{f} = (T_{s} + T_{\infty}) /2$ , with the diameter as the characteristic length:

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

Nusselt Number (Churchill–Chu)

N u = {0.60 + \frac{0.387 R a _{D}^{1/6}}{[ 1 + ( 0.559/ P r ) ^{9/16} ] ^{8/27}}}^{2}

valid for $1 0^{- 5} \leq R a_{D} \leq 1 0^{12}$ .

Heat Transfer Coefficient and Heat Rate

h = \frac{N u \cdot k}{D}, Q = h (π D L) (T_{s} - T_{\infty})

References

Churchill, S. W. and Chu, H. H. S., Correlating Equations for Laminar and Turbulent Free Convection from a Horizontal Cylinder, Int. J. Heat Mass Transfer, 18, 1049, 1975.
Incropera, F. P. and DeWitt, D. P., Fundamentals of Heat and Mass Transfer, eq. 9.34.

[UPGRADE]

Need this tool, but deeper?

We build advanced versions on request — your fluids, your geometry, your standards, validated against plant data.

[REQUEST]

Missing a calculator?

Tell us what you're sizing or estimating — we build the calculators engineers actually ask for.

[FAQ]

Frequently asked questions

Average h and heat rate from an isothermal horizontal cylinder 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.