•  
  •  
 

Abstract

The fruits and vegetables pre-cooling effect and power consumption are greatly influenced by the supply air temperature of pre-cooling process. The heat transfer model of tomato was developed by theory of heat transfer and used to predict tomatoes of different diameters temperature change during the different temperature pre-cooling process. Then pre-cooling experiments of tomato were performed with the developed pre-cooling experiment setup. The relationships between supply air temperature, tomato diameter and temperature change rate of tomato, pre-cooling system power consumption were studied based on theoretical analysis and experimental data. The results show that the mean error between simulated and measured temperatures of tomato center was 0.685 ℃, so that the heat transfer model of tomato can be used to predict pre-cooling time effectively. Besides, pre-cooling time of tomato increases with the increase of supply air temperature and tomato diameter, pre-cooling system power consumption increases with the decrease of supply air temperature. Finally, the optimization pre-cooling scheme of variable supply air temperature is proposed according to the above analysis results. The supply air temperature remains 4 ℃, 2 ℃, 0 ℃ during process of the tomato center temperature dropping from 26 ℃ to 15 ℃, 15 ℃ to 10 ℃ and 10 ℃ to 5 ℃, respectively. The optimized scheme can save energy 9.7% to 14.8%, compared to constant temperature pre-cooling schemes.

Publication Date

4-28-2016

First Page

131

Last Page

135

DOI

10.13652/j.issn.1003-5788.2016.04.032

References

[1] 束菲娅, 吴时敏, 黄丹枫, 等. 都市蔬菜冷链及装备现状调查与分析[J]. 食品与机械, 2012, 28(2): 225-228.
[2] Defraeye T, Lambrecht R, Delele A M, et al. Forced-convective cooling of citrus fruit: Cooling conditions and energy consumption in relation to package design[J]. Journal of Food Engineering, 2014, 121: 118-127.
[3] Tao Fei, Zhang Mim, Yu Hang-qing, et al. Effects of different storage conditions on chemical and physical properties of white mushrooms after vacuum cooling[J]. Journal of Food Engineering, 2006, 77: 545-549.
[4] 颜丽萍, 刘升, 饶先军. 预冷、冷藏运输和销售方法对青花菜品质的影响[J]. 食品与机械, 2012, 28(2): 174-177.
[5] 胡云峰, 李喜宏, 朱志强, 等. 果蔬保鲜温度梯度试验冷库的设计与效果分析[J]. 农业机械学报, 2005, 21(7): 132-135.
[6] Betta G, Rinaldi M, Barbanti D, et al. A quick method for thermal diffusivity estimation: Application to several foods[J]. Journal of Food Engineering, 2009, 91(1): 34-41.
[7] Olsson E E M, Janestad H, Ahrnel M, et al. Determination of local heat-transfer coefficients around a circular cylinder under an impinging air jet[J]. International Journal of Food Properties, 2008, 11(3): 600-612.
[8] 蒋巧俊, 郑永华, 徐静, 等. 杨梅气调贮藏及运输包装研究进展[J]. 食品与机械, 2015, 31(5): 261-265
[9] 尹海蛟, 杨昭, 陈爱强. 果蔬热处理传热过程的数值模拟及验证[J]. 农业工程学报, 2010, 26(11): 344-348.
[10] East A R, Smal J N, Trujillo J F. Potential for energy cost savings by utilising alternative temperature control strategies for controlled atmosphere stored apples[J]. International Journal of Refrigeration, 2013, 36(3): 1 109-1 117.
[11] 唐霞, 张明, 马俊莲, 等. 适宜贮藏温度保持鲜食无花果品质[J]. 农业工程学报, 2015, 31(12): 282-287.
[12] 闫沙沙, 段续, 任广跃, 等. 微波冷冻干燥传热传质模型的研究进展[J]. 食品与机械, 2015, 31(1): 244-248.
[13] 高恩元, 刘升, 李晓燕, 等. 开孔面积和包装方式对甜玉米差压预冷效果的影响[J]. 食品与机械, 2013, 29(5): 179-182.
[14] 吕恩利, 陆华忠, 杨洲, 等. 番茄差压预冷过程中的通风阻力特性[J]. 农业工程学报, 2010, 26(7): 341-345.
[15] 申江, 丁峰, 张现红. 变送风参数对西红柿差压预冷节能效果研究[J]. 制冷学报, 2015, 36(2): 113-118.
[16] 王娟, 谭金翠, 王相友. 风速对双孢蘑菇预冷过程的影响[J]. 农业机械学报, 2013, 44(10): 203-208.

Share

COinS
 
 

To view the content in your browser, please download Adobe Reader or, alternately,
you may Download the file to your hard drive.

NOTE: The latest versions of Adobe Reader do not support viewing PDF files within Firefox on Mac OS and if you are using a modern (Intel) Mac, there is no official plugin for viewing PDF files within the browser window.