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制冷学报2007年第二期摘要

2007/7/19/15:42 来源:中国制冷学会

  关于中国制冷学会 》》

中西方减压贮藏研究概述
Stanley P. Burg郑先章
(1.美国 VacuFresh 公司 迈阿密 33133;2.扬州通利冷藏集装箱有限公司 扬州 225000)

  摘 要:减压贮藏系统用调节大气压力控制O2浓度,其技术与效果与CA完全不同。低压下,空气进入真空室会膨胀,使其中的CO2、C2H4及挥发性污染物浓度减少99%;增强气体扩散及减弱呼吸,使不同物品能忍受0.1%~0.2% 的O2浓度。气体扩散增强还促进CO2、NH3和C2H4从物品内部逸出,连续换气将其排到室外。在1.33~2.67 kPa极低压力下,物品呼吸热少相应的能蒸的水分就少,高湿度和防止对流及辐射减少物品失水。极低压时O2极稀薄,园艺品呼吸热和传热能力因对流抑制了90%。极低压防止细菌和霉菌生长,杀灭昆虫,抑制C2H4生成量>90%,防止CO2伤害,抑制有毒的琥珀酸盐形成,限制Vc损失,阻止C2H4形成酶,因此减压设备极有利于园艺品贮藏。概述西方减压研究成果与发展,评价中西方在减压研究上存在的重要差异。

  关键词:食品包装与贮藏;低压贮藏;热传递;失水;昆虫检疫;呼吸;乙烯
 
Summary of Hypobaric Research in China and the West
Stanley P. Burg☆ and Zheng Xianzhang
☆ VacuFresh Co.,Miami,Florida, 33133, USA
AbstractA hypobaric storage system controls the O2 concentration by regulating the atmospheric pressure, but its technology and effect differ from CA entirely. At a low pressure the CO2, C2H4, and volatile contaminant concentrations present in the incoming air decrease by up to 99% when the air expands during entry into the vacuum storage chamber, and increased gaseous diffusion and respiratory inhibition cause different commodity types to tolerate 0.1%-0.2% O2. Increased gaseous diffusion also promotes the escape of CO2, NH3 and C2H4 from within the commodity, while continuous air-changes flush these gases from the storage chamber. During ultra-low pressure hypobaric storage at 1.33-2.67 kPa a high relative humidity and the prevention of convective and radiant heat uptake by the commodity limit its water loss to the amount that can be evaporated in response to the small amount of respiratory heat it produces. O2 is so scarce that a horticultural commodity's respiratory heat production and ability to transfer heat by convection are inhibited by

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