Effects of Microwave Irradiation on Zeolite-based Water-vapor Desorption for Using Lower Humidity Air

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  • ITO Seiya
    Department of Chemical Engineering, Graduate School of Engineering, Nagoya University
  • WATANABE Fujio
    Research Institute for Industrial Technology, Aichi Institute of Technology
  • Hongyu HUANG
    Department of Chemical Engineering, Graduate School of Engineering, Nagoya University
  • HASATANI Masanobu
    Department of Mechanical Engineering, Faculty of Engineering, Aichi Institute of Technology
  • KOBAYASHI Noriyuki
    Department of Chemical Engineering, Graduate School of Engineering, Nagoya University

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Other Title
  • 低湿度空気を用いたゼオライト系水蒸気脱着のマイクロ波照射効果
  • テイシツド クウキ オ モチイタ ゼオライトケイ スイジョウキ ダッチャク ノ マイクロハ ショウシャ コウカ

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Abstract

The author has proposed a hybrid air-conditioner employing both heat and microwave irradiation for achieving greater compactness and higher output of a desiccant air-conditioner. In this research, the effectiveness of this system has been evaluated for promoting desorption of adsorbed water using microwave irradiation and heating under two conditions: air with the same humidity as that in the adsorption process (Case-1) and air with humidity lower than that in the adsorption process (Case-2). This evaluation was done using the desorbability and desorption rate as indicators. In the experiment, measurements were taken of hot air temperature due to the zeolite-filled layer (50–100ºC), microwave intensity (30–100 W), and temperature in the filled layer and humidity at the intake and outlet of the layer, in the desorption process under three types of initial conditions for adsorbed amount. The results are given below. 1) The heat balances for Case-1 and Case-2 can be evaluated using the same technique. 2) The desorption time and thermal efficiency of the system with combined use of microwaves, taking the hot air system desorbability in Case-2 as a reference standard, are respectively a minimum of 0.3 times and a maximum of 1.3 times the values in the hot air system. This suggests that, compared to conventional hot air heating type desiccant air conditioners, it is possible to increase the amount of treated air by 1.25 times, and reduce the adsorption rotor cross-sectional area by 0.8 times. 3) Adoption of microwaves will contribute to efficient, high-level desorption.

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