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首页> 外文会议>ASME(American Society of Mechanical Engineers) International Mechanical Engineering Congress: Advanced Energy Systems Division; 20031115-20031121; Washington,DC; US >AMMONIA CONDENSATION HEAT TRANSFER IN AIR-COOLED MESOCHANNEL HEAT EXCHANGERS
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AMMONIA CONDENSATION HEAT TRANSFER IN AIR-COOLED MESOCHANNEL HEAT EXCHANGERS

机译：空冷介孔换热器中氨的冷凝传热

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A mathematical model is formulated in this paper for the prediction of the heat rejection rate, assuming that the total heat transfer area of the mesochannel condenser is made up of 2 different areas, corresponding to superheated vapor state and the two-phase flow state. Each of these areas is considered as an independent heat exchanger (Mamani et al., 1999). The tested mesochannel condenser, manufactured by a Romanian company for automotive air-conditioning systems, is made of aluminum, based on an extrusion process; an oven brazing process was used for the headers to tubes joints. Maximum heat rejection rate represents the criteria used in order to optimize the geometrical configuration of the condenser. This theoretical study resulted in an optimized geometrical configuration of the mesochannel condenser (Heun et al., 1996a; Heun et al., 1996b). Experimental research has been carried out using a mesochannel condenser of optimized geometrical configuration. In order to ensure a quasi-state operating regime, the air-cooled mesochannel condenser was mounted inside an air loop, having multiple regulating and control means for the following parameters: inlet air dry bulb temperature, inlet air wet bulb temperature, and inlet air flow rate. The authors of the present paper develop a comparative analysis of theoretical vs. experimental heat rejection rate and heat transfer coefficient for an ammonia air-cooled mesochannel condenser.
机译：假设介通道冷凝器的总传热面积由2个不同的区域组成，分别对应于过热蒸汽状态和两相流动状态，则在本文中建立一个数学模型来预测排热率。这些区域中的每一个都被视为独立的热交换器（Mamani等，1999）。由罗马尼亚公司为汽车空调系统制造的经过测试的中通道冷凝器，是基于挤压工艺由铝制成的；管接头的集管使用烤箱钎焊工艺。最大散热率代表了用于优化冷凝器几何结构的标准。这项理论研究得出了中通道冷凝器的最佳几何构型（Heun等，1996a； Heun等，1996b）。已经使用具有优化的几何构型的中通道冷凝器进行了实验研究。为了确保准状态运行状态，风冷中通道冷凝器安装在空气环路内，并具有多个调节和控制装置，用于以下参数：进气干球温度，进气湿球温度和进气流量。本文的作者对氨气冷中通道冷凝器的理论排热率和实验排热率以及传热系数进行了比较分析。

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