蒸发器建模仿真与试验的比较  

Comparison Between Model-established Simulation and Experiment for Evaporators

作　　者：尹斌[1] 丁国良[2] 欧阳惕 

机构地区：[1]广东申菱空调设备有限公司,顺德528313 [2]上海交通大学,上海200030

出　　处：《制冷学报》2007年第2期51-55,共5页Journal of Refrigeration

摘　　要：采用稳态分布参数模型对R134a单元机的蒸发器进行仿真。使用改进的Kattan模型对R134a在光滑管内的流动形式进行划分,从而得出流型图。根据流型图,应用不同表达形式的关联式计算管内局部沸腾换热系数。CC Wang的模型用于计算百叶窗形翅片管式蒸发器的表面换热系数及压降。析湿系数通过试验数据建立的数据库确定。在仿真过程中,应用隐式三次多项式拟合模型计算R134a的物性。将仿真结果与试验数据对比发现,仿真值能够较为真实的反映机组的运行状态。通过误差分析得出制冷量的平均相对误差为1.12%,出风干球温度的平均相对误差为1.25%,出风焓的最大相对误差为0.88%,R134a出口温度的平均相对误差为4.0%。Abstract The simulation on an evaporator of an R134a air - conditioning unit was conducted with a steady state distribution parameter model. Using the update Kattan model, R134a flow patterns inside smooth tubes were divided, and then the flow pattern map was obtained. Based on the flow pattern map, local boiling heat transfer coefficients were calculated with different correlations. The surface heat transfer coefficient and the pressure drop of louver fin evaporators were calculated with C C Wang＇s model. The moisture separation coefficient was determined from the database established with test data. During simulation, implicit cubic polynomial curve - fitting model was used to calculate R134a thermodynamic properties. The results show that the simulation values are in agreement with the experiment data. The average relative error of refrigeration capacity, dry bulb temperature of outlet air, and R134a outlet temperature is 1.12%, 1.25%, and 4.0%, respectively. Moreover, the maximum relative error of outlet - air enthalpy is 0.88%.

关 键 词：热工学 蒸发器 稳态分布参数模型 试验 

分 类 号：TB657.2[一般工业技术—制冷工程]