无法在OpenModelica中评估直管的传热系数

发布于 2025-01-09 04:52:56 字数 713 浏览 0 评论 0原文

我正在尝试适应 Modelica.Fluid.Dissipation。我想使用函数 kc_overall 评估直管的传热系数。我尝试遵循UsersGuide示例。我不确定我是否理解如何编写它以及我必须使用哪些输入。这是我的代码：

model Heat_tranfer_calcul
 Modelica.SIunits.MassFlowRate M_FLOW=0.3 "input mass flow rate";
Modelica.Fluid.Dissipation.HeatTransfer.StraightPipe.kc_overall_IN_con IN_con(d_hyd=13e-3,L=15);
Modelica.Fluid.Dissipation.HeatTransfer.StraightPipe.kc_overall_IN_var IN_var(cp=4184,eta=8.9e-4,lambda=0.6,rho=1000) ;
equation
Modelica.Fluid.Dissipation.HeatTransfer.StraightPipe.kc_overall(IN_con,IN_var,M_FLOW)
end Heat_tranfer_calcul;

我还尝试直接从 Modelica.Media.Water.StandardWater 获取流体属性。如果有人可以帮助我了解该功能的工作原理，那将非常有帮助。

马克西姆

原文

I'm trying to get used to the Modelica.Fluid.Dissipation. I want to evaluate the heat transfer coefficient of a straight pipe using the function kc_overall. I tried to followthe UsersGuide example. I'm not sure I understood how to write it and which inputs I have to use. Here's my code:

model Heat_tranfer_calcul
 Modelica.SIunits.MassFlowRate M_FLOW=0.3 "input mass flow rate";
Modelica.Fluid.Dissipation.HeatTransfer.StraightPipe.kc_overall_IN_con IN_con(d_hyd=13e-3,L=15);
Modelica.Fluid.Dissipation.HeatTransfer.StraightPipe.kc_overall_IN_var IN_var(cp=4184,eta=8.9e-4,lambda=0.6,rho=1000) ;
equation
Modelica.Fluid.Dissipation.HeatTransfer.StraightPipe.kc_overall(IN_con,IN_var,M_FLOW)
end Heat_tranfer_calcul;

I also tried to get the fluid properties directly from the Modelica.Media.Water.StandardWater.
If someone could help me to uderstand how the function works that would be really helpful.

Maxime

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秋日私语 2025-01-16 04:52:56

函数kc_overall仅接受两个参数——记录IN_con和IN_var。质量流量必须通过 IN_var 指定，因此您的代码应该是：

model Heat_tranfer_calcul
  Modelica.SIunits.MassFlowRate M_FLOW=0.3 "input mass flow rate";
  Modelica.Fluid.Dissipation.HeatTransfer.StraightPipe.kc_overall_IN_con IN_con(d_hyd=13e-3,L=15);

  Modelica.Fluid.Dissipation.HeatTransfer.StraightPipe.kc_overall_IN_var IN_var(cp=4184,eta=8.9e-4,lambda=0.6,rho=1000, m_flow=M_FLOW);
equation
Modelica.Fluid.Dissipation.HeatTransfer.StraightPipe.kc_overall(IN_con,IN_var);
end Heat_tranfer_calcul;

顺便说一句，使用小写字母作为变量名称是很好的 Modelica 编码习惯，即 m_flow而不是M_FLOW。

The function kc_overall only takes two arguments — the records IN_con and IN_var. The mass flow rate must be specified through IN_var so your code should be:

model Heat_tranfer_calcul
  Modelica.SIunits.MassFlowRate M_FLOW=0.3 "input mass flow rate";
  Modelica.Fluid.Dissipation.HeatTransfer.StraightPipe.kc_overall_IN_con IN_con(d_hyd=13e-3,L=15);

  Modelica.Fluid.Dissipation.HeatTransfer.StraightPipe.kc_overall_IN_var IN_var(cp=4184,eta=8.9e-4,lambda=0.6,rho=1000, m_flow=M_FLOW);
equation
Modelica.Fluid.Dissipation.HeatTransfer.StraightPipe.kc_overall(IN_con,IN_var);
end Heat_tranfer_calcul;

By the way, it is good Modelica coding practice to use lowercase letters for variable names, that is m_flow instead of M_FLOW.

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