A measurement method of adsorption/desorption rate controlled by adsorbent temperature in moist air of atmospheric pressure

Takafumi Ouchi, Yoshinori Hamamoto, Hideo Mori

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2 Citations (Scopus)

Abstract

Adsorption/desorption phenomena which are reactions of adsorbing vapor with exotherm and desorbing vapor with endotherm depend on adsorbent temperature and vapor pressure. When the pressure is constant, the amount of the adsorbed vapor increases with decreasing the adsorbent temperature generally. Adsorption/desorption rate controlled by the adsorbent temperature in constant pressure dominates the performance of adsorption chillers or desiccant systems. To predict the system performance, it is important to measure accurately the variation in the adsorbed amount and the adsorbent temperature in transient adsorption/desorption process. Generally, gravimetric method is used to measure the adsorption/desorption rate from adsorbent weight change, because this method allows measuring that in constant pressure. However, these methods cannot measure the adsorbent temperature directly and accurately. Therefore, we investigated to improve the measurement accuracy of adsorbent temperature, and then we tried to establish a measurement method on adsorption/desorption rate with a cantilever. In this study, adsorption/desorption rate was measured from difference in deflection of the cantilever caused by weight change of adsorbent with laser displacement sensor. We confirmed that 77 mg variation of weight can be measured within 2 mg accuracy. We measured the adsorbed water vapor mass of porous alumina film in adsorption and desorption processes alternately, and discussed the influence of adsorbent temperature on those rates. Furthermore, the diffusivity of water vapor in adsorbent has been obtained and compared with the data measured by conventional method. Finally, we confirmed that this method can detect the mass and temperature changes precisely then it leads to accurate diffusivity.

Original languageEnglish
Publication statusPublished - Jan 1 2014
Event15th International Heat Transfer Conference, IHTC 2014 - Kyoto, Japan
Duration: Aug 10 2014Aug 15 2014

Other

Other15th International Heat Transfer Conference, IHTC 2014
CountryJapan
CityKyoto
Period8/10/148/15/14

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All Science Journal Classification (ASJC) codes

  • Mechanical Engineering
  • Condensed Matter Physics

Cite this

Ouchi, T., Hamamoto, Y., & Mori, H. (2014). A measurement method of adsorption/desorption rate controlled by adsorbent temperature in moist air of atmospheric pressure. Paper presented at 15th International Heat Transfer Conference, IHTC 2014, Kyoto, Japan.