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Redesign of calorimeter for assessment of adsorption working pair characteristics.

Number: pap. n. 46

Author(s) : SELWYN R., SAIDANI SCOTT H., TIERNEY M. J.

Summary

Thermally-driven adsorption chillers are an attractive alternative to traditional electrically-driven vapour compression refrigeration cycles for certain applications. Knowledge of the adsorption characteristics of the working pair is vital for designing and predicting performance of the chiller. Previous work by the group developed a calorimeter which could measure the heat released during adsorption directly, instead of inferring it from pressure or weight measurements. The calorimeter showed agreement with other published data for characteristics of the silica gel-water working pair to within 10%, however better accuracy is desirable. Following a redesign process, improvements have been made to the calorimeter. Mechanical redesign has reduced the rate of air ingress into the rig from ~1 mbar/hour to <<0.1 mbar/hour. The configuration of the rig will allow a larger range of adsorbent configurations to be tested, and it is hoped that effective investigation into desorption will be possible. Temperature control to a constant set point has been improved from within 0.2K to within 0.02K, and to a sinusoidally varying set point from within 0.176K to within 0.05K. However, for the calorimeter discussed here inferred heat flows have so far proved inconsistent – further investigation is ongoing. Initial adsorption tests using 3mm diameter type A silica gel beads suggest agreement with Gluekauf’s linear driving force model, however problems with the reliability of inferred heat flow must be solved before reporting further.

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Pages: 10 p.

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Details

  • Original title: Redesign of calorimeter for assessment of adsorption working pair characteristics.
  • Record ID : 30014316
  • 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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