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

[Radiation]

Free tool

Aligned Parallel Plates

Net radiant heat exchange between two equal, directly-opposed gray plates.

[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]

Radiation scales with absolute temperature to the fourth power — a surface at 600 °C radiates over five times more than the same surface at 300 °C.

[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]

Aligned Parallel Plates

Computes the net radiant heat exchange between two equal, isothermal gray rectangles ( $L \times W$ ) mounted face-to-face and directly opposed, separated by a gap $D$ .

View Factor

With the dimensionless ratios

x = \frac{L}{D}, y = \frac{W}{D}

the shape factor for two aligned parallel rectangles is

F_{12} = \frac{2}{π x y} [ln \frac{( 1 + x ^{2} ) ( 1 + y ^{2} )}{1 + x ^{2} + y ^{2}} + x 1 + y^{2} tan^{- 1} \frac{x}{1 + y ^{2}} + y 1 + x^{2} tan^{- 1} \frac{y}{1 + x ^{2}} - x tan^{- 1} x - y tan^{- 1} y]

As the plates become large compared with the gap ( $x, y \to \infty$ ) the view factor approaches unity; for square plates with $x = y = 1$ it gives $F_{12} \approx 0.200$ .

Net Radiant Exchange

For a two-surface gray, diffuse enclosure,

Q = \frac{σ ( T _{1}^{4} - T _{2}^{4} )}{\frac{1 - ε _{1}}{ε _{1} A _{1}} + \frac{1}{A _{1} F _{12}} + \frac{1 - ε _{2}}{ε _{2} A _{2}}}

with $σ = 5.670374 \times 1 0^{- 8} W/m^{2} K^{4}$ , $A_{1} = A_{2} = L W$ , and temperatures in Kelvin. When both surfaces are black this reduces to $Q = σ A_{1} F_{12} (T_{1}^{4} - T_{2}^{4})$ .

References

Incropera, F.P. & DeWitt, D.P., Fundamentals of Heat and Mass Transfer, Wiley.
Holman, J.P., Heat Transfer, 7th ed., McGraw-Hill, 1990.

[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

Net radiant heat exchange between two equal, directly-opposed gray plates. Enter your inputs and press Calculate — the worked solution shows every step of the method with your numbers substituted in.

A gray surface has an emissivity that is constant across wavelength, so one number ε between 0 and 1 characterises how it emits and absorbs. It is the standard engineering idealisation; real oxidised metals and painted surfaces follow it closely enough for plant calculations.

Use the built-in table as a starting point: polished aluminium is around 0.05, oxidised steel around 0.8, painted or anodised surfaces around 0.9. Surface condition dominates — use the in-service condition, not the as-machined one.