CIESC Journal ›› 2012, Vol. 63 ›› Issue (S1): 138-144.DOI: 10.3969/j.issn.0438-1157.2012.z1.025

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Convective heat transfer of air flow in cold cabinet with two-fluid model

WEI Min1,2,WANG Limin1   

  • Received:2012-02-29 Revised:2012-04-25 Online:2012-05-28 Published:2012-05-28
  • Supported by:

    National Natural Science Foundation of China

双流体模型模拟冰柜空气对流传热

魏民1,2,王利民1   

  1. 1中国科学院过程工程研究所多相复杂系统国家重点实验室,北京 100190;2中国科学院研究生院,北京 100049
  • 通讯作者: 王利民
  • 基金资助:

    国家自然科学基金项目;中国科学院战略性先导科技专项

Abstract: The convective heat transfer of the cold cabinet was investigated by using two-fluid model after the effectiveness of new model was confirmed. This study includes the influence of wind speeds,wind directions and speeds of air curtain. The results show that the convective heat transfer is improved along with increasing of the wind speed. In a relatively short time,there is a linear relationship between convective heat transfer and time. The wind direction has small effect on heat transfer when it is less than about 15° while has appreciable impact and made an increase of energy consumption by approximately 30% when it reaches 30°. The air curtain,a major constituent of the refrigeration system of cold cabinet,provides a barrier of moving air across a door opening and reduces heat transfer by preventing the penetration of hot air. The simulation shows that there is the minimum speed and the best speed range of air curtain. The air curtain can not be formed when the speed is less than 1.5 m·s-1,while has a large spillover of cold air when it is greater than 3.0 m·s-1. From the above,the best speed of air curtain ranges from 2.6 m·s-1 to 3.0 m·s-1.

Key words: cold cabinet, convective heat transfer, two-fluid model, numerical simulation

摘要: 采用双流体模型对冰柜空气对流传热进行了数值模拟,在验证了模型有效性的前提下,考察了不同外部风速、风向以及不同风幕速度下的冰柜空气对流传热特性。结果表明,外部风速越大,冰柜内外热量交换越多,并且在较短时间内,冰柜内外热量交换与时间基本呈线性关系;外部风向与水平风向相差15°以内时,影响较小,而达到30°时,出现明显影响,能量损失相比水平风向增大约30%;此外,考察了风幕对隔绝冰柜内外热量交换的影响,发现存在最小风幕速度和最佳风幕速度范围,风幕速度小于1.5 m·s-1时不能形成有效风幕,大于3.0 m·s-1会造成冷气外溢,造成能量损失,最佳风幕速度范围为2.6~3.0 m·s-1。

关键词: 冰柜, 对流传热, 双流体模型, 数值模拟

CLC Number: