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Solid sorption of ammonia observed at the salt grain scale and its refrigeration and thermal powers.

Number: 0039

Author(s) : PUBILL A.

Summary

Among the refrigeration systems working with ammonia, it should be pointed out that there are not many small-scale solutions with low refrigeration power available on the market. Nonetheless, solid-gas sorption implementing a reversible chemical reaction offers a tuneable heat and refrigeration power, and an autonomous alternative, with no need of complex small compressors adapted for ammonia use. As the sorption process occurs thanks to the presence of a reactive salt, it is essential to understand the chemical sorption process of the ammonia at the salt grain scale. For this, observation of the growing process of the aforementioned grains has been carried out during ammonia intake thanks to a microscope Keyence VHX 7000. 2-dimensionnal (2D) images and 3-dimensionnal (3D) compositions of the grains have been post-processed to estimate the volume increase of the grains, which has resulted to almost 4 times in average compared to its initial volume. As ammonia gas pressure decay has been measured in the meanwhile, absorption rate has been evaluated and it has been shown that in the case of calcium chloride (CaCl2), at the grain scale, heat and refrigeration powers peaked, respectively, at 255 W and 85 W per gram of anhydrous salt.

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Pages: 8

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Details

  • Original title: Solid sorption of ammonia observed at the salt grain scale and its refrigeration and thermal powers.
  • Record ID : 30030998
  • Languages: English
  • Subject: Technology
  • Source: 10th IIR Conference on Ammonia and CO2 Refrigeration Technologies.
  • Publication date: 2023/04/27
  • DOI: http://dx.doi.org/10.18462/iir.nh3-co2.2023.0039

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