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Fields of Research

In the field of cogeneration, a variety of different fuels are used, such as natural gas, biogas, biogenic liquid fuels, products from the thermochemical gasification of biomass with different qualities or even synthetic fuels such as hydrogen (H2).

Particularly when new types of fuels are used, the exhaust emission behaviour has not yet been fully researched. In order to reduce emissions, the entire CHP process is being considered and optimised, from the fuel to the internal engine processes to the exhaust gas aftertreatment.

The overall objective of the research work is to increase the electrical and thermal efficiency of CHP systems through:

  • Internal engine improvements
  • Optimisation of peripheral components
  • Waste heat conversion
  • Micro-CHP

The use of biogenic fuels as fuel for CHP systems is being investigated as part of this field of action.

  • Adaptation and further development of combustion engines for use with biogenic fuels
  • Ignition jet technology
  • Hot air turbine processes for biomass CHP plants

The increasingly decentralised provision of energy requires the further development of the CHP system as a whole. This includes:

  • Networking of CHP plants for the intelligent provision of electricity and heat
  • Integration of storage technologies into CHP systems to balance out fluctuating electricity and heat demand.
  • Provision of control energy to stabilise the grid in view of the increasing use of renewable energies.

Of particular interest for application-oriented research are innovative and forward-looking technologies, such as:

  • Use of fuel cells in the area of combined heat and power generation
  • Micro-expansion turbines for CHP processes and micro-steam processes based on organic fluids (Organic Rankine Cycle)



  • A. Röll, F. Luo, N. O’Connell, R. Lechner, C. Wang, M. Brautsch: Hydraulic stability of micro injections using a two-layered 8-hole solenoid injector with PODE, Fuel 2021, Vol. 297, DOI: https://doi.org/10.1016/j.fuel.2021.120748
  • S. Ishikawa, N. O`Connell, R. Lechner, R. Hara, H. Kita, M. Brautsch: Load response of biogas CHP systems in a power grid. In: Renewable Energy 2021, Vol. 170, DOI: doi.org/10.1016/j.renene.2021.01.120
  • J. Spale, V. Novotny, M. Vojtech, A.P. Weiß: 3D printed radial impulse cantilever micro-turboexpander for preliminary air testing. AIP Conference Proceedings 2323, 070002 (2021); https://doi.org/10.1063/5.0041433
  • V. Novotny, J. Spale, D. Suchna, J. Pavlicko, M. Kolovratnik, A.P. Weiß: Absorption power cycle with a 3D-printed plastic micro turboexpander- Considerations, design and firstexperimental results. AIP Conference Proceedings 2323, 070003 (2021); https://doi.org/10.1063/5.0041429
  • P. Streit, T. Popp, J. Winkler, R. Scharf, A.P. Weiß: Numerical and experimental investigation of different technologies for adjusting the swallowing capacity of a cantilever ORC turbine. AIP Conference Proceedings 2323, 070001 (2021); https://doi.org/10.1063/5.0041483


  • A. P. Weiß, P. Streit, T. Popp, P. Shoemaker, T. Hildebrandt, V. Novotny, J. Spale: Uncommon turbine architectures for distributed power generation – development of a small velocity
    compounded radial re-entry turbine. In: Archieves of Thermodynamics 2020, Vol. 41, DOI: 10.24425/ather.2020.135862
  • C. Wang, M. Adams, T. Jin, Y. Sun, A. Röll, F. Luo, M.Gavaises: An analytic model of diesel injector`s needle valve eccentric motion. In: International Journal of Engine Research 2020. https://doi.org/10.1177/1468087420987367
  • R. Lechner, A. Hornung, M. Brautsch: Prediction of the knock propensity of biogenous fuel gases: Application of the detonation theory to syngas blends. In: Fuel 2020, Vol. 267. doi.org/10.1016/j.fuel.2020.117243
  • A.P. Weiß, V. Novotny, T. Popp, P. Streit, J, Spale, G. Zinn, M. Kolovratmik: Customized ORC micro turbo-expanders - From 1D design to modular construction kit and prospects of additive manufacturing. In: Energy 2020, In press. doi.org/10.1016/j.energy.2020.118407
  • J. Oischinger, M. Steiner, M. Meiller, M. Hebauer, S. Beer, R. Daschner, A. Hornung, J. Kramb: Optimization of the fractional collection efficiencies for electrostatic precipitators used in biomass-fired boilers. In: Biomass and Bioenergy 2020, Vol. 141. doi.org/10.1016/j.biombioe.2020.105703
  • C. Wang, A. Röll, K. Kolovos, A. V. Roncero, Y. Sun, P. Koukouvinius, M. Gavaises, M. Brautsch, R. Lechner, N. O`Connell, Z. He, F. Luo: Transient flow characteristics within a diesel injector using a compressible density-based solver. ILASS-Asia 2020, Oct. 13-26, Zhenjiang, China






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