翅片管空气冷却器传热系数模型

发布时间：2019-02-16 20:32

【摘要】：以管内介质有相变的翅片管空气冷却器为研究对象,采用量纲分析、泛函分析等方法,构建了一个合理的翅片管空气冷却器传热系数关联式。以氨泵供液型空气冷却器为实验研究对象,设计了结构参数、迎面风速、库温、驱动温差和供液倍率等多因素、多水平的实验方案,并采用校准箱法测得不同测点下的传热系数。采用测试数据并以关联式为目标函数,通过非线性拟合方法建立了适用于氨泵供液空气冷却器传热系数计算的关联式。关联式计算值与实测值相对误差在±10%之间,且分项管内换热系数大于管外换热系数,符合空气冷却器换热系数分布的一般规律,证明了传热关联式是合理准确的。在氨泵供液空气冷却器常用设计点,关联式计算值约为设计经验值1.11~1.30倍,这表明采用关联式设计该类型空气冷却器可节约11%~30%的换热面积,提高了经济效益。
[Abstract]:Taking finned tube air cooler with phase change in tube as the research object, a reasonable correlation formula of heat transfer coefficient of finned tube air cooler is constructed by means of dimensional analysis and functional analysis. Taking the ammonia pump liquid type air cooler as the experimental research object, a multi-factor and multi-level experimental scheme was designed, such as structure parameters, face wind speed, reservoir temperature, driving temperature difference and liquid supply ratio, etc. The heat transfer coefficient at different measuring points was measured by calibration box method. Using the test data and the correlation as the objective function, the correlation formula suitable for the calculation of the heat transfer coefficient of the ammonia pump air cooler is established by nonlinear fitting method. The relative error between the calculated value and the measured value of the correlation formula is 卤10%, and the heat transfer coefficient in the partial tube is larger than the heat transfer coefficient outside the tube, which accords with the general law of the heat transfer coefficient distribution of the air cooler, and proves that the heat transfer correlation is reasonable and accurate. At the common design point of ammonia pump air cooler, the calculated value of the correlation formula is about 1.111.30 times that of the design experience, which indicates that the heat transfer area can be saved by 1130% and the economic benefit can be improved by adopting the correlation design method for this type of air cooler.
【作者单位】：烟台冰轮股份有限公司研发设计部;机械科学研究总院中机生产力促进中心;
【分类号】：TB657

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