WHR – Internal Combustion Engine

Diesel Engine and Gas Turbine Application

ORC engine

Internal Combustion Engines (ICE) and gas turbines have thermal efficiencies in the range of 30% to 50%. The majority of the energy generated by fuel combustion is dissipated in the exhaust gases and jacket cooling. An ORC system can be used to recover heat either from exhaust gases (>300°C) or from hot water in the cooling jacket (90°C). Gas Turbines and Diesel engines’ electrical production can be enhanced by 8% to 15% with a payback time often lower than 3 years.

You can see our standard products for heat recovery in the Products section

Environmentally friendly

For hight temperature applications, AQYLON’s organic working fluids have a very low Global Warming Potential (3-20).


AQYLON’s ORC modules are designed for durability and fit into standard containers, allowing for modular deployment.


AQYLON’s ORC modules apply cutting edge technology to maximize efficiency according to the heat source. AQYLON holds four patents related to turbines and ORC technology, and eight more are pending.

Heat recovery on diesel engines and gas turbines

ORC modules are available from 500 KWe to 5 MWe. AQYLON’s ORC modules convert waste heat contained in exhaust fumes into electricity. Our Organic Rankine Cycle (ORC) technology increases electricity production from engines or gas turbines by around 10%. Because the heat to drive the ORC cycle comes from the exhaust fumes, fuel consumption is unaffected. When recovering exhaust fumes, a heat exchanger (boiler) must be placed on the chimney to collect the heat and transfer it to a thermal oil loop that will feed the ORC module.

We have the ability to value flue gas or/and jacket water. This figure shows one single circuit for both flue gas and jacket water. However, for economical or financial reasons, it may be interesting to have two separate circuits, with one ORC to recover the flue gas heat and a second separate ORC to recover the jacket water heat.



Recovery of the heat output in the form of high pressure and high temperature steam.

ORC technology avoids corrosion issues and turbine wear associated with steam turbines – such as blade erosion and high speed operation – resulting in low maintenance costs. Our ORC modules can rapidly ramp up to match changing power needs, from 30% up to 120% of nominal capacity. Rugged design ensures a life expectancy of over 25 years.

ORC diesel engine

We can value the flue gas, the jacket water or both.

The radiator of an engine is a pure investment, with no chances of payback time. Moreover, it has to be replaced on regular basis. Please, note that when we are recovering the jacket water heat with an ORC, the engine is cooled by the ORC. Then, our solution replaces the engine’s radiator. http://www.aqylon.com/applications/energy-efficiency/whr-internal-combustion-engines/ http://www.aqylon.com/applications/energy-efficiency/whr-internal-combustion-engines/So, for a new engine installation, there will be no need to buy the dedicated engine’s radiator, and for an existing engine there will be no need to replace it regularly, as our system has a 25 years lifetime. Note that if cool down the engine with the ORC instead of a radiator, you produce electricity instead of consuming electricity.

ORC gas turbine

In the case of gas turbine, it is possible to recover of the heat output in the form of high pressure and high temperature steam. Using this steam by an ORC allows to significantly increase the electrical output of the assembly and increase the electrical efficiency..