Energy Recuperation with a Turbo-Generator

The combination of turbomachine and electric motor as a turbo-generator can be used in a variety of ways for energy recovery. Throttle valves are used in many systems for control purposes, but are associated with high energy losses. A turbine can also provide the throttling effect, and has the advantage of generating shaft power. Throttle energy can thus be recuperated by generating electrical power via a generator coupled to the turbine. This principle is the basis of our ThrottleCharger, which we developed together with Sonceboz for Lambda 1 gasoline engines. The throttling required for load control is efficiently linked to the generation of electrical power.


Refrigeration processes are used in many applications, such as in production and storage facilities, vehicle and building air conditioning, as well as in process engineering in general. Conventional refrigerants based on F-gases pose a risk to the environment and safety and will be regulated or prohibited in the future. The time has come for new ideas! With our TurboCool approach, we use air directly as a refrigerant and can provide either cooling and heating output, as the application requires. Based on mass-produced automotive turbocharger components, we have created a demonstrator that illustrates the conceptual elegance of this air conditioning system without needing any F-gases.

Exploit Enthalpy to the Maximum


Fuel Cell Air Supply

The overall efficiency of fuel cell systems depends to a large extent on the efficiency of the air supply, which is why turbomachines are increasingly replacing screw compressors. In addition to these efficiency advantages, turbomachines offer the option of converting residual enthalpy by means of a turbine placed at the fuel cell outlet – in other words, energy recuperation. For the thermodynamic evaluation of such air supply systems for fuel cells, we draw on our recognised competencies in measurement technology and conditioning. Therefore, we use test bench systems tailored specifically to this application.

Hot Gas Test Bench

We consider the hot gas test bench to be a key core element in the development and validation of turbochargers. To guarantee precise and reproducible thermodynamic evaluations for our customers as part of our measurement services, we use combustion chamber test benches that we have developed and built in-house. We also develop and implement subsystems required for robust validation tests of turbocharger systems, doing so fully independently. This allows us to respond flexibly to new trends and requirements in turbocharger development with specifically engineered testing procedures. Based on our long years of experience, we can advise and provide troubleshooting support to customers who operate their own test facilities.

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