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Numerical simulation of heat and mass transfer in a desiccant rotor regenerated by concentrated solar irradiance.

Author(s) : HAMAMOTO Y., MORI H.

Summary

The study aims at making a theoretical model of performance analysis for a desiccant rotor regenerated by concentrated solar energy with direct heating process, and at developing a humidity control system driven by renewable energy. The objectives of this investigation is to develop a simulation model considering the absorptivity of solar ray in the desiccant rotor, to clarify the distribution of humidity and amount of adsorbed water in the rotor, and to evaluate the dehumidification performance and the influence of rotor material and parameters. Concentrated solar ray irradiates the energy to the rotor material directly. In an airflow channel of the rotor, the portion of the solar ray is absorbed to the rotor and the remainder is reflected. There is a distribution of the received energy to the direction of the channel. In a previous study, it was clarified numerically the received energy distribution in the rotor, that heated effectively at an assumed high apsorptivity condition. In this study, a measured absorptivity was used for the simulation. The concentrated heat was relatively small at low absorptivity, therefore it was difficult to regenerate the rotor effectively. The enlargement of the rotor length can be improved the energy concentration slightly. A suitable rotor length was 0.1 m at the absorptivity of 0.2. An adoption of metal as a base material of the rotor leads to the decrease of the performance in this condition. It is important to develop a high absorptivity material to improve the performance.

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Pages: 2009-5

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Details

  • Original title: Numerical simulation of heat and mass transfer in a desiccant rotor regenerated by concentrated solar irradiance.
  • Record ID : 2009-2120
  • Languages: English
  • Subject: General information
  • Source: 3rd Conference on Thermophysical Properties and Transfer Processes of Refrigerants
  • Publication date: 2009/06/23

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