Heat and mass transfer mechanism in adsoprtion heat pumps: Experiment and dynamic modeling
- Conference Paper
For designing adsorption heat pumps, quantifying heat and mass transfer resistances in adsorbents is crucial. However, heat and mass transfer occur as two resistors in series and can therefore not be separately identified in conventional setups. In this work, we present an approach to separate and quantify heat and mass transfer resistances in adsorbents. For this purpose, we extended the Large-Temperature-Jump method (LTJ) with an infrared camera (IR) and combined the new IR-LTJ method with dynamic modeling. The IR camera determines the surface temperature of the adsorbent, allowing us to distinguish the heat and mass transfer resistances. Subsequently, the data from the IR-LTJ setup is used in dynamic models to quantify heat and mass transfer coefficients. We conducted experiments for one layer of granulated silica gel 123 and determined the heat transfer coefficient to 165 W/(m2·K) for adsorption and to 255 W/(m2·K) for desorption. For mass transfer, the effective diffusion coefficient is 2 to 3·10-7 m²/s for adsorption and 7.5·10-8 m²/s to 2.5·10-7 m²/s for desorption. The IR-LTJ method allows to identify the limiting effects for heat and mass transfer in adsorption heat pumps Show more
Book titleProceedings of the IX Conference Minsk International Seminar "Heat Pipes, Heat Pumps, Refrigerators, Power Sources"
Pages / Article No.
PublisherNational Academy of Sciences of Belarus
Organisational unit09696 - Bardow, André / Bardow, André
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