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预冷冷库内冰浆式湿冷蒸发器的性能实验研究
王子安,武卫东,余强元
0
(上海理工大学制冷与低温工程研究所)
摘要:
对果蔬预冷应用场合,本文提出一种冰浆式湿冷蒸发器,并将其应用于小型模拟冷库。采用娃娃菜为被冷却对象,以库内温度和相对湿度为指标,改变填料类型(金属、塑料、纸质填料)和载冷介质(冰浆、冷水),在冷库空载条件下进行负载预冷实验。结果表明:金属、纸质填料的换热能力较塑料填料好;与冷水相比,以冰浆为载冷介质,预冷时间缩短了1/6并保持更低的库内温度,库内相对湿度稳定后均能保持在90%以上;预冷后样品失重率较冷水的小0.19%;冰浆式湿冷蒸发器可在冷库中稳定运行,且较冷水为载冷介质的湿冷蒸发器,可更高效地实现预冷过程的低温(3~6 ℃)高湿(>90%RH)环境,适用于果蔬预冷和保鲜。
关键词:  果蔬预冷  性能实验  湿冷蒸发器  冰浆  冷库
DOI:
投稿时间:2018-09-26修订日期:2018-11-17
基金项目:“十二五” 国家科技支撑计划(2015BAD19B02)资助项目。
Experimental Study on Performance of Evaporator with Ice-slurry in Precooling Cold Storage
Wang Zian,Wu Weidong,Yu Qiangyuan
(Institute of Refrigeration and Cryogenic Engineering, University of Shanghai for Science and Technology)
Abstract:
A dehumidification evaporator with ice-slurry has been proposed and applied in a small-scale modeling cold storage for the precooling of fruits and vegetables.Performance comparison experiments were conducted by changing the types of fillers, i.e., metal, plastic, and paper, and cold medium, i.e., cold water and ice slurry, under no-load conditions in the cold storage with the storage temperature and relative humidity as evaluation parameters. Then, a load precooling experiment was conducted with a baby cabbage as a sample. Results showed that under the experimental conditions,the heat transfer performance of metal and paper fillers were better than that of the plastic fillers; the precooling time, with ice slurry as the cold medium, was 1/6 shorter than that when cold water was used, and the relative humidity in the cold storage could be maintained at above 90%. In addition, the load precooling experiment showed that the weight loss rate of the sample was 0.19% smaller than that of cold water. In comparison with the evaporator with water, the evaporator with ice-slurry could be operated reliably in the cold storage and achieved the working conditions of the low temperature (3–6 ℃)and the high humidity (>90%RH) for precooling more efficiently, and thus, is suitable for precooling and preserving of fruits and vegetables.
Keywords:  fruits and vegetables precooling  performance experiment  dehumidificationevaporator  ice slurry  cold storage

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