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Thermal conductivity and volume cooling capacity of a new type of consolidated composite activated carbon.

Author(s) : WANG L. W., METCALF S. J., CRITOPH R. E., et al.

Summary

Expanded natural graphite treated with sulphuric acid (ENG-TSA) had been proven to have much higher thermal conductivities than natural graphite. A consolidated composite activated carbon that utilizes ENG-TSA as matrix is developed, and the thermal conductivity of the adsorbent is studied. Results show that the thermal conductivity not only related to the density, but also related to the ratio of ENG-TSA and the size of activated carbon grains in the sample. Smaller grains of activated carbon in the composite give higher thermal conductivity than larger grains. The highest thermal conductivity, over than 30 W/(mK), was obtained while the ratio of ENG-TSA was 67% and the bulk density was about 430 kg/m3, which is over 150 times higher than that of granular activated carbon. Based on the experimental results of thermal conductivity and the bulk density of activated carbon in the composite consolidated adsorbent, the performance of an adsorption unit with fin-tube structure was analyzed, and the volume cooling capacity of the tube was calculated. The volume cooling capacity is influenced by the cycle time, which is related to the heat transfer performance, and the bulk density of activated carbon. Results show that the sample with the activated carbon ratio of 50% and density of 412 kg/m3 has highest volume cooling capacity because of the higher volume density of activated carbon and the reasonable value of thermal conductivity.

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Pages: 495-502

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Details

  • Original title: Thermal conductivity and volume cooling capacity of a new type of consolidated composite activated carbon.
  • Record ID : 30001247
  • Languages: English
  • Source: Sources/sinks Alternative to the Outside Air for Heat Pump and Air-conditioning Techniques (Alternative Sources - AS), Padua, Italy, April 5-7, 2011. / International Sorption Heat Pump Conference (ISHPC11), Padua, Italy, April 6-8, 2011.
  • Publication date: 2011/04/06

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