monetizing waste heatTM


Key characteristics

  • Cost-effective – 3.5 year payback
  • Green (no emissions)
  • Easy (1-day install)
  • Available 24/7


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 (c.90°C)(or low-grade waste heat “LGWH”) that they produce. This is about to change.

If your generators or processes produce 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:

-Make use of low-grade waste heat for the first time
-Increase revenue from power-generating plants
-Reduce energy bills
-Reduce pollutant emissions for cleaner air
-Reduce carbon emissions to tackle climate change
-Maximise energy efficiency
-Increase reliability of power supply
-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. This is thermally cycled to deliver rotary motion, and then converted to electricity. Characteristics include:

  • Clean, reliable power
  • Low-cost electricity
  • Simple, quick installation
  • NO heat exchangers
  • NO emissions CO2, NOx or other any pollutants
  • It’s good for the planet

Why Exergyn®?

Why select the 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. Organic Rankine Cycle (ORC) is one of the most successful and it is ideal when recovering waste heat at 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 use refrigerant working fluids.

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 fully deployed in all its target market, then over 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, 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, geothermal energy or solar energy), enhanced tariffs can significantly boost the returns to customers.  Even without “green tariffs” many profitable markets exist for the Exergyn Drive™ e.g. shipping, 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 current storage solutions.


Biogas power generation is a significant contributor to the renewable energy agenda in Europe and worldwide.
Biogas power uses 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 Digester from organic feedstocks such as animal manure, farm waste and food waste.

Industrial Waste Heat

Many manufacturing industries in sectors such and food, drink, pharmaceutical, chemical, oil & gas production produce waste heat, often low-grade waste heat which cannot be recovered economically.
One of our initial trials will utilise waste heat from an industrial manufacturing facility.

Waste to Energy/Advanced Thermal Conversion

Converting waste matter into energy is on the increase, incineration is the established technology and Advanced Thermal Conversion or ACT is on the up. ACT can use processes such as gasification or pyrolysis and can use engines to generate electricity.
Waste to Energy plant can operate continuously and has waste heat which can be recovered.
Landfill is still used in some countries and landfill gas can be used in gas engines for power generation.



If you have suitable heat resources that are currently being wasted and are interested in partnering with us to conduct a trial of the Exergyn Drive™  on your company’s premises or site, 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. He is a co-founder of Exergyn.


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

Kevin, a co-founder of Exergyn,  has over 12 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:

Tony Ennis 

Chairman. Tony has 25+ years’ experience developing and scaling companies in the Energy Industry. Founder & Former  CEO of Vayu.

bcDr. Barry Cullen

Barry Cullen is a co-founder of Exergyn with Kevin O’Toole and Alan Healy. Barry holds a PhD in Advanced Engineering Thermodynamics, having studied the use of waste heat to power in a novel combined cycle system for high efficiency power generation and cogeneration systems. Read more about Barry here. 

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.

derek duffill

Derek Duffill

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


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.


Andy Dorn

Co-founder & Former Director of Oxford Diffractions. Dipl Production Engineering.  Advisor on outsourced manufacturing. Chairs Exergyn’s Technical Steering Group

Peter Godfrey1

Peter Godfrey

Peter is a Senior Singapore-based Energy Sector executive and consultant.

CA HallChas Anders Hall

Chas has 45 yrs. of professional and C suite experience in the delivery of sustainable energy independence and efficiency optimization.

Paul FrickerPaul Fricker 

Paul has 40 years’ experience in the automotive & manufacturing industries before establishing his own consultancy.

john leahyJohn Leahy

John is ex-Director of Safety for Ryanair, and an ex-Chief Pilot for British Airways. He has previous board level experience and acts as Investor Representative.


Our Mission

To significantly impact climate change and global air-quality for the better through the profitable, mass-deployment of our products


For more information contact our CEO – Alan Healy.

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