Thermal design software · Engineering consulting

Cooling systems,
solved cell by cell.

AEON calculates every fan, bundle and fill zone individually, so you see how wind, recirculation and fan switching really affect performance. For air-cooled condensers, cooling towers, coils and dry coolers.

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Power & processHVAC & refrigerationData center cooling

AEON component model of a three-row air-cooled condenser with steam, air and condensate connections

AEON component model · three-row air-cooled condenser

Software and consulting from one engineering team

THERM develops thermal simulation software for cooling and heat transfer equipment, and uses the same tools in its consulting work. Equipment manufacturers use our models to design and select their products. Plant owners and engineers use our studies to understand and improve real installations.

Cell-level accuracyEvery cell gets its own solution. No identical-cell assumption.
ValidatedPredictions checked against measured plant performance.
Cloud-basedAEON runs in the browser, hosted on Microsoft Azure.
In your own softwareCustom calculation engines delivered as source code.
40+ yearsCollective experience in applied thermofluid dynamics.

Eleven technologies. Three industries.

AEON’s component-based models cover cooling and heat transfer equipment from power plants to supermarkets and data centers.

Power & process

Heat rejection for steam power plants, CSP, CHP, petrochemical and process applications.
Forced-draft air-cooled condensersInduced-draft wet cooling towersDry/wet hybrid cooling towers
Power & process applications →

HVAC & refrigeration

Finned coils and heat exchangers for air handling, commercial refrigeration and heat pumps.
Hot water and chilled water coilsCondensers and steam condensersDX evaporator coilsTranscritical CO2 gas coolers
HVAC & refrigeration applications →

Data center cooling

External heat rejection for data centers, sized for hot days and high-density loads.
Dry coolers and air-cooled heat exchangersWet cooling towers for the heat rejection loop
Data center applications →

AEON · Cloud platform

See what every cell is really doing

Conventional rating methods assume all cells perform the same. AEON builds your system from individual components and solves each one, including how the cells interact. Uneven airflow, hot air recirculation, wind effects, steam backflow and water maldistribution all show up in the results.

Design and off-design ratingFan speed and fan switching per cellWind and recirculation effectsExtendable tube, fill and fan databasesYour own results templates: performance, parts lists, costsResults as JSON, CSV and PDF

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Result view · heat rejected per cellSolution converged
AEON results for a three-row air-cooled condenser showing heat rejected per cell
Twelve cells, twelve different results: edge cells and cells near the steam inlet behave differently, and AEON shows by how much.

Our models, where you need them

Use THERM’s thermal models in the cloud, inside your own software, or alongside your operating plant.

Cloud platform

AEON

Browser-based thermal design and rating for cooling systems, hosted on Microsoft Azure. Nothing to install, always up to date.
Subscription access for your teamCell-level results for every componentEleven cooling technologies
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For manufacturers

Custom calculation engines

THERM’s calculation methods delivered as source code, integrated into your own selection and design software on your own servers.
Your product data stays in-houseCalculations inside your own sales toolsDeveloped for your product range
Discuss a custom engine →
Digital twins

CLONE

Thermal performance digital twins that run on measured plant data, built on AEON and THERM’s CFD studies.
Real-time performance benchmarkingEarly detection of performance lossRoot-cause analysis and forecasting
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CFD simulation of the hot air plume from an air-cooled condenser under crosswind

In-house CFD · air-cooled condenser plume under crosswind

Engineering consulting

Answers for operating plants and new projects

We apply our own software, including PLUME, our in-house CFD tool with validated fan and heat exchanger models, to questions that standard methods cannot answer.

Performance audits. Why a cooling system underperforms, and what it costs.Wind and recirculation studies. CFD analysis of wind effects and mitigation measures.Hybridization and plume abatement. Techno-economic studies for dry/wet systems.Brownfield and fuel-switch projects. Performance maps for existing cooling systems in new roles.

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Validated against real plant data

0.3 °CAverage deviation of AEON from measured cooling water temperatures*
11Cooling and heat transfer technologies modeled
40+Years of collective experience in thermofluid dynamics
2Engineering offices, in Essen and Somerset West
Publication · vgbe energy journal 7·2024

Application of thermal performance digital twins for cooling systems at fuel-switch and brownfield projects

An AEON model of a dry/wet hybrid cooling tower at a 433 MWe CHP plant in Germany predicted measured cooling water temperatures to within 0.3 °C on average. The original performance curves were off by 6.1 °C.
Read the summary →
Conference · vgbe Cooling Systems 2025

Real-time thermal performance monitoring of an air-cooled condenser with a digital twin

A digital twin for the air-cooled condenser of a 100 MWe solar thermal plant, combining AEON, CFD wind studies and machine learning, developed with research partners.
Read the summary →
*Hybrid operation, 13 measured operating points. Original supplier performance curves: 6.1 °C. Source: vgbe energy journal 7·2024.

Cooling system thermal design software and consulting

THERM Development develops AEON, cloud-based thermal design and rating software for air-cooled condensers, wet and hybrid cooling towers, hot and chilled water coils, condensers, DX evaporator coils, transcritical CO2 gas coolers and data center dry coolers. Equipment manufacturers use AEON and our custom calculation engines to design and select their products.

Power plant operators, EPCs and data center engineers use our consulting studies on cooling system performance, wind effects, hot air recirculation and plume abatement. THERM works from Essen, Germany and Somerset West, South Africa, for clients worldwide.

See AEON on your
own design case

Book a demo with one of our engineers, or tell us about a cooling system question you need answered.

Request a demo →Contact our engineers