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Comparison among three adsorption pairs for using as the working substances in a multi-bed adsorption heat pump.

Author(s) : SAN J. Y., LIN W. M.

Type of article: Article

Summary

A comparison among three adsorption pairs (activated carbon-methanol, silica gel-water and 13X molecular sieves-water) for using as the working substances in a four-bed adsorption heat pump is presented. A solid-side resistance model considering a finite mass flowrate of heating/cooling fluid was adopted. The result shows that, for small mass flowrates of the heating/cooling fluid, assuming a constant temperature for the heating/cooling fluid might give rise to an over-predication of the system performance. For the adsorption heat pump, there exists an optimum mode operating time which corresponds to a maximum specific cooling power. For operations at the maximum specific cooling power (optimum mode operating time = 3-6 min) and with regeneration temperatures in the range 80-120°C, among the three adsorption pairs, the activated carbon-methanol pair leads to the highest specific cooling power, COP value and second-law efficiency. For the silica gel-water pair, the temperature rise resulting from adsorption heat significantly downgrades the system performance. This causes its corresponding specific cooling power, COP value and second-law efficiency to be lower than those for the activated carbon-methanol pair. The 13X molecular sieves-water pair possesses. [Reprinted with permission from Elsevier. Copyright, 2007].

Details

  • Original title: Comparison among three adsorption pairs for using as the working substances in a multi-bed adsorption heat pump.
  • Record ID : 2008-1632
  • Languages: English
  • Source: Applied Thermal Engineering - vol. 28 - n. 8-9
  • Publication date: 2008/06

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