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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Developing Tube Flow

Mean h for combined-entry-length (developing) laminar or turbulent flow in a smooth tube.

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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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Developing Tube Flow (Combined Entry Length)

Calculates the mean heat transfer coefficient along the length of a tube from an abrupt square entry, where both the velocity and temperature profiles are still developing.

Film Temperature

T_{f} = \frac{T _{w} + T _{b}}{2}

Reynolds Number

R e_{D} = \frac{ρ u _{m} D}{μ}

Laminar Developing Flow (Re < 2 300)

Define the entry-length parameter:

ξ = (\frac{R e P r}{L / D})^{1/3}

If ξ ≥ 2 (thermally developing): $N u_{m} = 1.86 ξ (μ / μ_{w} \approx 1)$
If ξ < 2 (effectively fully developed): $N u_{m} = 3.66$

The viscosity ratio μ/μ_w is assumed unity (appropriate for gases and near-ambient liquids).

Turbulent Developing Flow (Re ≥ 2 300)

Gnielinski fully-developed Nu:

f = (0.79 ln R e - 1.64)^{- 2}

N u_{dev} = \frac{( f /8 ) ( R e - 1000 ) P r}{1 + 12.7 f /8 ( P r ^{2/3} - 1 )}

Entry-length correction (Incropera eq. 8.57):

N u_{m} = N u_{dev} (1 + \frac{2.4254}{( L / D ) ^{0.676}})

The entry factor is validated for Pr ≈ 0.7 (air).

Heat Transfer Coefficient and Heat Rate

h = \frac{N u _{m} \cdot k}{D}, Q = h \cdot (π D L) \cdot (T_{w} - T_{b})

Validity

Laminar: 0.48 < Pr < 16 700
Turbulent: 0.5 < Pr < 2 000, Re < 5 × 10⁶
Entry correction for turbulent regime validated for Pr ≈ 0.7 (air); apply with caution for other fluids

References

Gnielinski, V., Int. Chem. Eng., 16, 359, 1976.
Incropera, F.P. and DeWitt, D.P., Fundamentals of Heat and Mass Transfer, 3rd ed., John Wiley & Sons, eq. 8.57, 8.63a & 8.63b, 1990.
Rohsenow, W.R., Hartnett, J.P. and Cho, Y.I., Handbook of Heat Transfer, 3rd ed., McGraw-Hill, 1998, p. 5.29.

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Frequently asked questions

Mean h for combined-entry-length (developing) laminar or turbulent flow in a smooth tube. 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.