Measurement of equilibrium adsorption and adsorption/desorption rate of water vapor to a silica gel thin film coated on a cross fin tube heat exchanger

Yoshinori Hamamoto, Takafumi Ouchi, Hideo Mori

研究成果: 著書/レポートタイプへの貢献会議での発言

1 引用 (Scopus)

抄録

Adsorption/desorption rate of vapor to adsorbent on an adsorption heat exchanger is one of the important characteristics in order to design and improve the performance of adsorption chillers and dehumidifying/humidifying desiccant systems effectively. In the present study, for a silica gel thin film adsorbent coated on an aluminum plate in a cross fin tube heat exchanger, we measured the equilibrium adsorption of water vapor with TGA and the adsorption/desorption rate with gravimetric method under the different flow velocity of humid air. The equilibrium adsorption was formulated with function of relative humidity. In addition, we obtained overall mass transfer resistance related to both the mass diffusion in the film and the mass transfer in the boundary layer on the film. It was clarified that the influence of the resistance on the reaction rate appeared only at the beginning of reaction, and the resistance decreased with the increase of the velocity, especially in adsorption. Furthermore, the resistance in desorption was less than half in adsorption. Consequently, the resistance in the boundary layer was a negligible quantity for desorption when the flow rate was above 0.1 m/s. Finally, correlations were proposed to predict these resistances.

元の言語英語
ホスト出版物のタイトルACRA 2016 - 8th Asian Conference on Refrigeration and Air-Conditioning
出版者Asian Conference on Refrigeration and Air Conditioning (ACRA)
出版物ステータス出版済み - 2016
イベント8th Asian Conference on Refrigeration and Air-Conditioning, ACRA 2016 - Taipei, 台湾省、中華民国
継続期間: 5 15 20165 17 2016

その他

その他8th Asian Conference on Refrigeration and Air-Conditioning, ACRA 2016
台湾省、中華民国
Taipei
期間5/15/165/17/16

Fingerprint

tube heat exchangers
Tubes (components)
Silica gel
silica gel
fins
Water vapor
water vapor
Desorption
desorption
Adsorption
Thin films
adsorption
thin films
adsorbents
Adsorbents
mass transfer
boundary layers
Boundary layers
Mass transfer
flow velocity

All Science Journal Classification (ASJC) codes

  • Control and Systems Engineering
  • Mechanical Engineering
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

これを引用

Hamamoto, Y., Ouchi, T., & Mori, H. (2016). Measurement of equilibrium adsorption and adsorption/desorption rate of water vapor to a silica gel thin film coated on a cross fin tube heat exchanger. : ACRA 2016 - 8th Asian Conference on Refrigeration and Air-Conditioning Asian Conference on Refrigeration and Air Conditioning (ACRA).

Measurement of equilibrium adsorption and adsorption/desorption rate of water vapor to a silica gel thin film coated on a cross fin tube heat exchanger. / Hamamoto, Yoshinori; Ouchi, Takafumi; Mori, Hideo.

ACRA 2016 - 8th Asian Conference on Refrigeration and Air-Conditioning. Asian Conference on Refrigeration and Air Conditioning (ACRA), 2016.

研究成果: 著書/レポートタイプへの貢献会議での発言

Hamamoto, Y, Ouchi, T & Mori, H 2016, Measurement of equilibrium adsorption and adsorption/desorption rate of water vapor to a silica gel thin film coated on a cross fin tube heat exchanger. : ACRA 2016 - 8th Asian Conference on Refrigeration and Air-Conditioning. Asian Conference on Refrigeration and Air Conditioning (ACRA), 8th Asian Conference on Refrigeration and Air-Conditioning, ACRA 2016, Taipei, 台湾省、中華民国, 5/15/16.
Hamamoto Y, Ouchi T, Mori H. Measurement of equilibrium adsorption and adsorption/desorption rate of water vapor to a silica gel thin film coated on a cross fin tube heat exchanger. : ACRA 2016 - 8th Asian Conference on Refrigeration and Air-Conditioning. Asian Conference on Refrigeration and Air Conditioning (ACRA). 2016
Hamamoto, Yoshinori ; Ouchi, Takafumi ; Mori, Hideo. / Measurement of equilibrium adsorption and adsorption/desorption rate of water vapor to a silica gel thin film coated on a cross fin tube heat exchanger. ACRA 2016 - 8th Asian Conference on Refrigeration and Air-Conditioning. Asian Conference on Refrigeration and Air Conditioning (ACRA), 2016.
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N2 - Adsorption/desorption rate of vapor to adsorbent on an adsorption heat exchanger is one of the important characteristics in order to design and improve the performance of adsorption chillers and dehumidifying/humidifying desiccant systems effectively. In the present study, for a silica gel thin film adsorbent coated on an aluminum plate in a cross fin tube heat exchanger, we measured the equilibrium adsorption of water vapor with TGA and the adsorption/desorption rate with gravimetric method under the different flow velocity of humid air. The equilibrium adsorption was formulated with function of relative humidity. In addition, we obtained overall mass transfer resistance related to both the mass diffusion in the film and the mass transfer in the boundary layer on the film. It was clarified that the influence of the resistance on the reaction rate appeared only at the beginning of reaction, and the resistance decreased with the increase of the velocity, especially in adsorption. Furthermore, the resistance in desorption was less than half in adsorption. Consequently, the resistance in the boundary layer was a negligible quantity for desorption when the flow rate was above 0.1 m/s. Finally, correlations were proposed to predict these resistances.

AB - Adsorption/desorption rate of vapor to adsorbent on an adsorption heat exchanger is one of the important characteristics in order to design and improve the performance of adsorption chillers and dehumidifying/humidifying desiccant systems effectively. In the present study, for a silica gel thin film adsorbent coated on an aluminum plate in a cross fin tube heat exchanger, we measured the equilibrium adsorption of water vapor with TGA and the adsorption/desorption rate with gravimetric method under the different flow velocity of humid air. The equilibrium adsorption was formulated with function of relative humidity. In addition, we obtained overall mass transfer resistance related to both the mass diffusion in the film and the mass transfer in the boundary layer on the film. It was clarified that the influence of the resistance on the reaction rate appeared only at the beginning of reaction, and the resistance decreased with the increase of the velocity, especially in adsorption. Furthermore, the resistance in desorption was less than half in adsorption. Consequently, the resistance in the boundary layer was a negligible quantity for desorption when the flow rate was above 0.1 m/s. Finally, correlations were proposed to predict these resistances.

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M3 - Conference contribution

BT - ACRA 2016 - 8th Asian Conference on Refrigeration and Air-Conditioning

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