monetizing waste heatTM


Key characteristics

  • Cost-effective – 3.5 year payback
  • Green (no emissions)
  • Easy (1-day install)


We all use power at home and at work. We are all aware of climate change and we want clean energy that doesn’t harm the planet.  But we want power to turn the lights on when it is dark or cook at mealtimes – we can’t wait until it is sunny or windy. And we are all used to cheap energy. We want clean, low-cost power at the right time – but this is not an easy ask. This is sometimes known as the energy trilemma and it is one of the biggest headaches in the energy industry today. Exergyn aims to change this. Exergyn has noticed that so much energy is wasted as hot water and we aim to use it. Exergyn has a really innovative, easy-to-use solution to deliver cost effective electricity where and when it is needed AND with no emissions.

Until now there has been no commercially feasible way for hundreds of thousands of companies worldwide to make use of the enormous quantities of wasted hot water (or low- grade waste heat “LGWH”) that they produce. This is about to change.

If your company’s generators or processes produce a constant flow of wasted hot water, you can increase your profitability and decrease the carbon-intensity of your business with the Exergyn Drive™.

The Exergyn Drive™ converts LGWH to electricity.

We enable customers to:

-Increase revenue from power-exporting plant
-Reduce energy bills
-Reduce carbon and pollutant emissions
-Enable delivery of environmental CSR objectives



The core of the technology is an elegantly simple device. The drive is based around a solid-state reciprocating technology which is thermally cycled to deliver rotary motion, and then converted to electricity. Characteristics include:

  • NO heat exchangers
  • NO CO2 emissions
  • NO flue gas emissions
  • NO NOx or other pollutants
  • It’s good for the planet

Why Exergyn®?

Why Purchase an Exergyn Drive™?


The ‘fuel’ for our solid-state reciprocating engine is hot water – a resource that up until now has proved almost impossible to exploit commercially.  And there’s a lot of this fuel about.

The amount of energy lost globally each year as wasted hot water is equivalent to twice the output of Saudi Arabia (oil & gas!)


Many heat recovery solutions exist including the Organic Rankine Cycle (ORC). They usually perform cost-effectively at much higher temperatures. At lower temperatures, both output and efficiency drop and this in turn increases CAPEX/kWe and lengthens the payback period.

Exergyn is fundamentally different.  Our products are not sensitive to temperature in the same way. The CAPEX/kWe will be about ½ of ORC, so we have rapid payback.

The Exergyn Drive™ does NOT uses refrigerant working fluid.

The Exergyn engine operates at the temperatures that many ORC have on the outlet.  Exergyn Drive™ can therefore bolt on to ORCs to produce hybrid WHR (waste heat recovery).


If the Exergyn Drive™ was used in all its possible global applications, then a 1.2% cut in global carbon emissions could be achieved. The Exergyn Drive™ also helps deliver cleaner air as there are no emissions of other greenhouse gases and pollutants such as NOx, SOx ash or other toxic particulates. This can help to deliver immediate health benefits that clean air brings.
By delivering energy savings and/or increasing the power exported, the Exergyn Drive™ makes financial sense as well as helping to achieve businesses’ environmental targets. We believe that convincing companies ‘through their pockets’ is a far more powerful way to effect change than is a reliance on the goodwill of companies to choose the ‘right’ path.


The potential market for our products is enormous. In the renewable energy sector, for example (incl. biogas, syngas and geothermal energy), enhanced tariffs can significantly boost the returns to customers.  Even without “green tariffs” many profitable markets exist for the Exergyn Drives™ e.g. marine, gensets and industrial waste heat. The Exergyn Drive™ can also store energy and provide solutions for energy storage applications, potentially offering a cleaner, lower cost alternative to batteries.

Biogas & Landfill Gas

Our initial emphasis is on the European Biogas sector. Biogas represents an attractive commercial prospect for power generation suppliers, project developers and owners alike.  However, the sector has an enormous untapped potential that it is struggling to unlock: low-grade waste heat produced by the engines.  The Exergyn Drive™ is the key to unlocking this potential.



Biogas power generation is a significant contributer to the renewable energy agenda in Europe and worldwide.

Biogas power utilises the methane-rich gas released during the decomposition of organic material to generate electrical power that is typically provided directly to the electrical grid.

The gas is typically generated in an Anaerobic Digestor from organic feedstocks such as animal manure, farm waste and food waste.

Landfill Gas

Landfill gas power generation is related to Biogas. It is produced at landfill sites, where the decomposition of the organic component of the waste matter gives rise to a methane-rich gas that can be recovered and used for power generation.


We plan to trial 10kW Exergyn Drives™  from Q1 2018, and are seeking trial partners with waste heat eg Biogas, CHP, and power generation industries.

If you have a 750kW+ generator and would be interested in trialling the Exergyn Drive™  on your plant, please get in touch.

Our Team

We have built a very strong team, which we expect to expand as we grow. If you have engineering or commercial skills, look at our careers page.

Our Management Team:


Alan Healy, CEO

Entrepreneur, author, speaker and consultant, Alan has experience working with start-ups, developing companies and large established companies in Ireland, the UK, South Africa, Australia and the US.


Dr. Kevin O’Toole, Director of Research & Development

Kevin has over 11 years experience in technical R&D, and holds a PhD in shape memory alloy(SMA) actuator technology – the material which lies at the heart of the Exergyn Drive™ within Exergyn.

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Richard Blackburn, BEng, CEng, FIMechE, Head of Engineering

Richard has taken many products from prototype through to high-volume production in his 20-year career, working at companies such as Rolls Royce, Nissan and Gilette.

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Mike Langan, Commercial Director

Mike has over 25 years’ experience in the energy industry developing and commercialising innovative energy technologies. Experience covers British Gas/BG, IMI and ENER-G and working in or with start-ups and SMEs.

Non-Exec Directors:


Barry Mulligan

Barry is a private investor nominee with significant entrepreneurial, board & investor experience.

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Derek Duffill

Derek has 40 years’ industry/energy experience; ex-MD of TAC and ENER-G; sales & ops director of Satchwell Control Systems.

bcDr. Barry Cullen

Barry is a co-founder of Exergyn and an expert in energy systems and efficiency. He holds a PhD in thermodynamics.

Advisory Council:

Professor Steve Evans

Steve is Director of Research in Industrial Sustainability at the University of Cambridge, as well as Director of the Centre for Industrial Sustainability.

Adrian Haworth

Adrian is ex-GE: Director of European Service Sales, Region Director for Russia/CIS, and Director of GE Energy’s Strategic Marketing department.

John Leahy

John is ex-Director of Safety for Ryanair, and an ex-Chief Pilot for British Airways.


Our Vision

Meaningfully reduce global carbon emissions… via the profitable mass deployment of our revenue-enhancing/money-saving products.

Our Mission

Commercially maximize the conversion of waste heat to power.


For more information contact our CEO – Alan Healy. Alternatively, please contact us via our web form.

t: +353 (1) 907 2770

For directions to our office, please see the following map.

Exergyn® – DCU Alpha – Old Finglas Road – Glasnevin – Dublin 11 – D11 TOVC – Ireland


EU Horizon 2020

Co-funded by the European Union’s Horizon 2020 research and innovation programme under the Grant Agreement No 672528