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A 2D model of a fin-tube adsorption heat exchanger.

Number: pap. n. 101

Author(s) : WITTSTADT U., LAURENZ E., FÜLDNER G., et al.

Summary

The adsorption heat exchanger (AdHEX) is a central component in adsorption heat pumps and chillers. Over the last decades, numerous attempts to optimize AdHEXs can be found in literature. A separate optimization of either heat or mass transfer characteristics is in many cases not successful as heat and mass transfer are highly coupled. Therefore, an understanding of the kinetic of adsorption in combination with the characteristics of the heat exchanger is needed. A two dimensional model of an AdHEX has been developed using a set of coupled partial differential equations for the calculation of heat and mass transfer within the simulation environment Comsol Multiphysics. The mass transfer is modeled with a linear driving force model using physical parameters for the description of the mass transfer. Flow arrangement (such as number of tubes in parallel) is considered in order to model the temperature distribution over the fin area. The model is validated with measurement data of a fin-tube heat exchanger (0.26 x 0.175 x 0.05 m) coated with SAPO 34 as adsorbent. Uptake curves have been determined by direct weighing of the AdHEX in large pressure jump experiments for different volume flows of the heat transfer fluid. A good agreement is achieved between the model and the experimental data of the full size AdHEX for both water uptake behavior and temperature of the heat transfer fluid by using mass transfer parameters determined on small samples.

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Pages: 10 p.

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Details

  • Original title: A 2D model of a fin-tube adsorption heat exchanger.
  • Record ID : 30013892
  • Languages: English
  • Source: International sorption heat pump conference (ISHPC2014), College Park, United States, March 31-April 2, 2014.
  • Publication date: 2014/03/02

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