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KMID : 1024420180220020118
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Food Engineering Progress
2018 Volume.22 No. 2 p.118 ~ p.125
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The Characteristics of Gas Exchange for Purge-type in a Controlled Atmosphere Storage System
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Park Seok-Ho
Park Chun-Wan
Kim Mi-Na
Choi Seung-Young
Choi Dong-Soo
Kim Jin-Se
Kim Yong-Hoon
Lee Soo-Jang
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Abstract
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The O2 and CO2 concentrations in controlled atmosphere (CA) rooms are determined by the respiration of produce like apples and the airtightness of the CA room, with gas in the CA room controlled by O2 and CO2 removal as well as respiration (CO2 increase and O2 decrease). The purpose of this study was to evaluate the validity of the gas exchange model for O2 removal, CO2 removal, the rate of O2 decrease and CO2 increase by respiration of apples, and airtightness of the CA room. It took 17.5 hours to reduce O2 concentration from 20.9% tO 2.0% after loading 4.3 tons of Fuji apples into the CA room, which was 4.2 hours longer than the 13.3 hours of the model formula. After the CO2 concentration rose to 0.5% due to respiration, it took 4.7 hours to lower the CO2 concentration to 0.2%, which was 0.6 hours longer than that of the model equation. The rate of CO2 increase by respiration was 0.021%/h, which was similar to the model equation (0.017%/h). Also after 4.7 hours, the O2 concentration decreased by 0.1% which was also in line with the model equation (0.13%/h).
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KEYWORD
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controlled atmosphere, gas exchange, carbon dioxide removal, oxygen removal
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