Abstract
However, near the chamber wall the packing of zeolite beads cannot be as tight as it is in the interior of the bed. Therefore, the porosity will change from the bulk value of 0.4, and in fact, it will nearly approach 1 at the wall.
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Notes
- 1.
That formula has to be interpreted in a homogenized sense. But since \(\phi _\mathrm {G}\) is a homogenized quantity, this should be clear anyway.
- 2.
Stokes’ equation can easily be implemented into OGS. In fact, it has a lot of similarities with the implementation of linear elastic isotropy, especially with implementations considering (near) incompressibility.
- 3.
To be precise: The field must be a 64-bit unsigned integer field, i.e. in the vtu file, the corresponding tag must read:
. - 4.
We only changed the porosity, but did not adapt the intrinsic density, such that \(m_\mathrm {S}= \int _\varOmega \varrho _\mathrm {S}\,\text {d}{\varOmega } = \int _\varOmega \varrho _{\mathrm {S}\mathrm {R}} \, \phi _\mathrm {S}\,\text {d}{\varOmega }\) decreased. In an experiment, one would probably determine the apparent density \(\varrho _\mathrm {S}\) of the zeolite, so care must be taken.
- 5.
That corresponds to 75% relative humidity at 20 \(^{\circ }\)C, which is a common value for ambient conditions in central Europe. That is to regenerate the bed, ambient air of 20 \(^{\circ }\)C is heated up to 180 \(^{\circ }\)C before it is pumped through the adsorbent bed.
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Lehmann, C., Kolditz, O., Nagel, T. (2018). Extensions. In: Models of Thermochemical Heat Storage. SpringerBriefs in Energy(). Springer, Cham. https://doi.org/10.1007/978-3-319-71523-0_5
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DOI: https://doi.org/10.1007/978-3-319-71523-0_5
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