水蒸気吸着体の放射率測定

Translated title of the contribution: Measurement of Emissivity of Water Vapor Adsorbents with Infrared Radiation Thermometer

濱本 芳徳, 森 英夫, 赤井 隆文, 三谷 賢史

Research output: Contribution to journalArticle

Abstract

One of the aims in this study is a development of a numerical analysis model to evaluate a desiccant dehumidifier which regenerates with concentration of solar ray. Inside of a desiccant rotor, in addition to convective heat transfer between airflow and adsorbent surface, radiative heat transfers from one adsorbent surface to another. As a matter of course, absorption and transmission of solar ray on the adsorbent surface occur. It is necessary to measure the emissivity, reflectivity, absorptivity and transmissivity. This paper presents the measurement of emissivity of vapor adsorbents. The measuring apparatus consists of an infrared radiation thermometer. Emissivity was measured in some temperature and humidity conditions. It was clarified that the emissivity decreased with the increase of relative humidity of adsorbent. The emissivity of silica gel particle was less than about 25% in high relative humidity condition compared with dry condition. An empirical formula was presented to predict an influence of the equilibrium adsorption on the emissivity. Moreover, it was clarified that the influence of the equilibrium adsorption on the emissivity of a sheet of adsorbent rotor was negligible.
Translated title of the contributionMeasurement of Emissivity of Water Vapor Adsorbents with Infrared Radiation Thermometer
Original languageJapanese
Pages (from-to)295-304
Number of pages10
Journal日本冷凍空調学会論文集
Volume26
Issue number3
DOIs
Publication statusPublished - Sep 30 2009

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