竖直盘管直接蒸发内融冰式冰蓄冷空调融冰机理  

The discharging characteristics of direct evaporation internal melt ice-on-vertical-coil thermal storage air conditioning system

作　　者：青春耀[1,2] 高日新[1] 高清华[1,2] 周智明[1] 冯自平[1] 刘振宇 崔昌学 张晓兰 杜光林 

机构地区：[1]中国科学院广州能源研究所,中国科学院可再生能源与天然气水合物重点试验室,广州510640 [2]中国科学院研究生院,北京100039 [3]青岛海尔空调电子有限公司,青岛266101

出　　处：《低温与超导》2009年第8期37-41,共5页Cryogenics and Superconductivity

基　　金：国家“863”计划项目(2007AA05Z221)资助

摘　　要：以竖直盘管直接蒸发内融冰式冰蓄冷空调蓄冰槽内的传热过程为基础,利用热阻网络法和能量平衡建立了融冰过程的数学模型,对其融冰机理进行了理论分析。计算结果表明,融冰过程中蓄冰槽盘管出口的制冷剂温度随时间逐渐升高,但在后期存在一个因冰柱碎裂上浮导致自然对流瞬时得到强化从而引起的短时间轻微下降现象。另外,蓄冰槽内的传热系数经历了先骤然降低,然后维持稳定,最后又快速上升的过程。该现象与盘管外由于冰融化所形成的水环直径有关,水环直径越大,释放冷量的速度就越小。通过与实验数据的对比,验证了计算模型的合理性和准确性。A mathematical model on the discharging process of direct evaporation internal - melt ice - on - vertical - coil thermal storage air conditioning system was developed, which based on the principle of serial heat transfer resistances and energy conservation. The ice melting characteristics were analyzed theoretically. Calculation results illuminates that refrigerant temperature at the outlet of the ice - coil rises with time, but a gentle drop of the temperature is found at the melting finishing period, because the cylindrical ice surrounding the coil breaks up and floats, which results in the natural convection enhancement instantaneously. On the other hand, during the melting process, the heat transfer c,oeffieient decreases sharply first, then maintains stable, and increases fast finally. A conclusion was gained that the phenomena was related to the diameter of the water ring formed as ice melting, and the discharging velocity decreased when the ring diameter grew up. The model＇s reasonability and reliability is verified by the experimental data.

关 键 词：直接蒸发 内融冰 冰蓄冷 融冰特性 传热 

分 类 号：TB657[一般工业技术—制冷工程] TK123[动力工程及工程热物理—工程热物理]