Reduced modeling of liquid desiccant falling film absorbers

Aktivität: Vortrag ohne Tagungsband / VorlesungPräsentation auf einer wissenschaftlichen Konferenz / Workshop


Periodic defrost cycles significantly reduce the energy efficiency of refrigeration systems in cold stores. By locally dehumidifying the air at the air coolers, condensation and thus frost formation can be prevented and defrost cycles become redundant. Liquid desiccant falling film absorbers are ideal candidates for dehumidification in cold stores, as the liquid desiccant can be regenerated by heat at a comparatively low temperature level, so that the waste heat from the refrigeration system may be utilized. However, the numerical description of falling film absorbers proves to be complex due to the coupled heat and mass transfer. In this work, a highly detailed three-dimensional CFD model of a falling film absorber is presented and a reduced one-dimensional model is derived based on it. Both models are used to represent experiments conducted in a previous project for building applications. Subsequently, the results of the higher fidelity CFD model are compared with those of the reduced one-dimensional model for a parameter variation in a cold store application. Both models show excellent agreement with the experiments, and the results of the reduced model agree well with the results of the CFD model for the cold store application, while requiring
Zeitraum26 Sept. 202230 Sept. 2022
EreignistitelÖPG 2022, 71st Annual Meeting of the Austrian Physical Society ÖPG

Research Field

  • Digitalisation and HVAC Technologies in Buildings


  • Open absorption
  • liquid desiccant
  • dehumidification
  • ionic liquid