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Membrane-based Air Conditioning

BMWi Euronorm Innokom-Ost

Dipl.-Ing. (FH) Hannes Rosenbaum


erfolgreich abgeschlossen

Decentralized Liquid Sorption

Starting point

Air conditioning systems have a significant primary energy demand. Air conditioning systems primarily based on conventional methods of dehumidification have great potential for energy savings, if it is possible to replace the energy-intensive air dehumidification through falling below the dew point temperature with dehumidification based on liquid desiccants. Therefore, especially in central air conditioning systems, both solid and liquid sorption processes are state of technology. About 5% of new installed central air conditioning systems with dehumidification work on this principle. Thereby solid or liquid hygroscopic storage masses absorb water vapor from the external air stream. For regeneration of the storage masses heat is needed. If for this renewable energy sources (solar heating) are used, the proportion of primary energy demand for air dehumidification reduced to zero. Higher energy efficiency, lower operating costs and reduced CO2 emissions are the result. But with the known methods of the state of technology, these energetic and positive economic effects cannot transfer on small air conditioning systems or cooling ceiling systems. The main target of the project is to implement the indirect cooled liquid sorption process (condensation-free cooling and dehumidification through membranes) into small air conditioning systems or cooling ceiling systems. Although the ILK Dresden since 2006 has developed and optimized the process itself and the required membrane-based heat and mass transfer surfaces as well as first concrete applications, there is still considerable need for development regarding to the entire system periphery. The target is to fill this "development gaps" by summarizing the various development areas such as system components, control, hydraulics, sorbent handling and overall configuration into a complex system development. The focus of the respective theoretical and metrological analysis (construction, aerodynamic, thermodynamic and material-technical investigations) is on energy and economic efficiency of the process and the system.

In detail, the development project deals with the following themes:

  • Development of a hydraulic concept for the connection of several elements in a zone, or a plurality of zones in a building: with minimized internal volume (sorbent), hydronic balance and low pressure losses
  • Development of an integrable preceding sorbent thermostating between sorbent entrance of the membrane element and the active membrane surface
  • Development and testing of an appropriate energy-efficient control (temperature control loop and humidity control loop)
  • Development of an energy efficient sorbent handlings (regeneration, conditioning, dosage, storage, transport, delivery)
  • Development and evaluation of micro solar absorbers or of resources of unused heat in a building to use this regenerative heat for the desorption process
  • Studies of coupling the membrane elements and the membrane process with other system components for air handling, taking into account the dynamic load profile of a year
  • Studies on the integration of the process and the membrane elements in climate processes and technical building systems generally
  • Optimization of the mechanical stability of the materials and compounds
  • System simulation for Energetic evaluation of the whole system
  • Algorithms for dimensioning room airconditioning systems working with the indirect liquid cooled sorption process on semipermeable membranes


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Institut für Luft- und Kältetechnik - Gemeinnützige Gesellschaft mbH
Bertolt-Brecht-Allee 20, 01309 Dresden

Secretary to the Management



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