What is an ORC?

The Organic Rankine Cycle is a thermodynamic cycle using an organic, high molecular mass fluid. It is similar to the Rankine Cycle, except that it uses an organic fluid instead of water.

The advantage of an organic fluid is to have a liquid-vapor phase change (or boiling point), occurring at a lower temperature than the water-steam phase change which allows heat recovery from lower temperature sources such as biomass combustion, industrial waste heat, geothermal heat, solar ponds, etc.

Through heat exchangers, a pump and a turbogenerator, low temperature heat is converted into useful work, which can then be converted into electricity.

In addition, the ORC module is especially engineered for the purposes of each particular cycle, giving the system many advantages and higher efficiency compared to water based cycles. Due to its sturdiness, low upkeep needs and the small initial investment required, AQYLON’s ORC solutions are highly suitable for remote and isolated locations as oil rigs and islands.AQYLON ORC module

How does it work?

Simple and innovative

The thermodynamic cycle starts  thanks to the pump propelling the organic fluid into the pipes.

The hot source transmits the heat to the organic fluid, through the evaporator, where the organic fluid is vaporized. Heat source temperature’s range is > 85°C.

AQYLON can create a value from hot sources such as:

– Heat from fumes

– Heat from exhaust gases

– Heat from processes

The very hot and high pressure gas is supplied to the ORC turbine. The turbine produces a fall of pressure between its entrance and its exit. Thanks to this reaction, the turbine starts running and spins the generator, which produces electricity.

In the condenser, the steam is condensed through water or air-cooling. This step causes a second change of stage, converting the gas back into a liquid.

The fluid is then pumped into the evaporator through the pump.

All this circuit is an entirely hermetic circuit.


Do you prefer to have ORC working principle’s explanation on video ?
Please check out this short YouTube presentation (1:50s) : How ORC Works, by MediaSelectLLC

Produce more with less energy

Unmatched thermodynamic cycle design know-how


AQYLON is committed to finding the most suitable working fluids and thermodynamic conversion cycles for both standard and custom power generation applications. Thanks to their extensive knowledge of virtually all potential working fluids and cutting-edge proprietary software solutions, our technical team can deliver unparalleled solutions for low to medium temperatures (400°C).

turbomachinery, expander


Integration is the key


AQYLON integrates all components in standard containers, delivering fully equipped easy-to-install solutions. Combining the skills of a vast range of suppliers and subcontractors with the integration capabilities of its core technical team, AQYLON provides excellent uptime with highly secured and easy-to-operate solutions.

unmatched thermo

State of the art turbomachinery for rugged and efficient expanders


Using the most advanced CFD software, AQYLON carefully designs and improves blade geometry to reach isentropic efficiencies as high as 88%, improving module efficiency and extending its lifetime.

ORC module integration

Performance and profitability combined

AQYLON works to fulfill great expectations and thus offers many advantages.


The most cost-effective ORC in the market, with pay-back time of 1 to 5 years and IRR higher than 15%.

Best adapted organic fluid for the proposed heat source

25-year lifetime

Low turbine speed (<7000 rpm), allowing direct drive of the electric generator without gear reduction in many applications

Very quiet operation: <79db

Cogeneration efficiency

>94% cogeneration efficiency with a partial load down to 30% of nominal power

Excellent operational performance

98% availability

Flexible business model

Direct sale or ESCO model with Power Purchase Agreement (investment and risks are bear by investors)

80% isentropic turbine efficiency

Waste heat Recovery in Industry

ORC solutions can be installed on a wide range of industries with high production of waste heat. We can recover heat from exhaust fumes, industrial processes, or both of them. In particular, our products are suitable for waste heat recovery in glass, cement, steel, paper industries, refineries and incinerators.

Waste Heat Recovery in industry

Waste Heat Recovery from engines

Waste heat Recovery from Internal Combustion Engines

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. Thanks to our ORC technology, we can recover the heat of the exhaust, jacket water, or both to generate additional electricity. This power can be used for on-plant consumption or can be sold to the grid.

Biomass & wood boiler applications

In biomass applications, the heat comes from the boiler and is used by the ORC. The ORC power plants can be used for cogeneration of heat and power or for electricity production alone.

biomass ORC


geothermal ORC


ORCs can be used in geothermal application to produce electricity. Power can be generated from the geothermal source itself, it can be used for district heating application. In this case, the heat from the condenser is used to feed the district heating network. It is a cogeneration application.

ORCs can also be used in co-produced fluid applications. For instance, when petrol is pumped, it comes up with hot water and has to be split. The hot water before returning to the ground can be send to an ORC and be used to produce electricity,  and offset the power bill of the plant.

Solar thermal (Concentrated Solar Power)

ORCs can be used in Concentrated Solar Power (CSP) applications. In this case, the ORC is fed by the pressurized water or thermal oil loop. ORC power plant are highly adapted to CSP technology. It is the best solution to produce clean electricity from low temperature heat sources.

solar thermal ORC