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The optimal adsorbent for adsorption chiller cycles.

Number: AD-YRI-1090

Author(s) : GRAF S., BAU U., ERDOGAN M., et al.

Summary

Adsorption chillers are an environmental-friendly alternative to conventional compression chillers. However, adsorption chillers exhibit low coefficients of performance (COP) and low specific cooling power (SCP) [1]. Both, COP and SCP depend strongly on the equilibrium data of the adsorbent: a high loading difference is beneficial for COP; a step-wise adsorption isobar ensures a high temperature difference between the adsorbent and the heat source/sink throughout the cycle, resulting in high SCP-values [2, 3]. This relation was studied in detail by Okunev et al. who modeled a step-wise adsorption isobar and simulated the resulting isobaric adsorption and desorption stages [4, 5]: Due to the step-wise adsorption isobar, heat transfer increases. Hence, the time for adsorption and desorption was shortened by factor 3 compared to common adsorbents, leading to the expectation that SCP would increase by the same factor. They further found that the adsorption time is only a factor 1.3 longer than the desorption time, compared to factor 2 for common adsorbents. Equal adsorption and desorption times allow for simple control and easier integration of heat and mass recovery.

Details

  • Original title: The optimal adsorbent for adsorption chiller cycles.
  • Record ID : 30022986
  • Languages: English
  • Source: International sorption heat pump conference, ISHPC 2017, Tokyo august 7-10.
  • Publication date: 2017/08/07

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