Question

我想模拟板式换热器模型，我在Modelica-Fluid-Library中使用默认版本。为了指定默认版本，我根据VDIWärmeatlas2006，Mm1建立了所有必要的传热参数和方程（Nusselt等）和压力损失。我已经尝试了很长时间来找到并纠正所有错误，但最后我来到了一个“死角”。

上一条消息的错误是：

Check of Fluid_Test1_PHE_Temp7.Examples.HeatExchanger.HeatExchangerSimulation:
Error: The model is not well-posed.
The model has
  484
scalar unknowns and
  480
scalar equations.
Using the given settings of the parameters, the difference could be reduced to
  4
Error: The following parameters don't have any value:
  HEX.pipe_1.diameter
  HEX.pipe_2.diameter

Warning: The following inputs lack binding equations:
  HEX.pipe_1.heatTransfer.roughnesses
  HEX.pipe_2.heatTransfer.roughnesses

Error: The problem is structurally singular:
It has 488 scalar unknowns and 484 scalar equations.
  The Real part has 456 unknowns and 452 equations.
  The Integer part has 32 unknowns and 32 equations.
  The Boolean part has 0 unknowns and 0 equations.
  The String part has 0 unknowns and 0 equations.
Attempting to further localize singularity.

The model has the same number of unknowns and equations.
Attempting to further localize singularity.

The model has the same number of unknowns and equations.
Attempting to further localize singularity.

The model has the same number of unknowns and equations.
The model has the same number of unknowns and equations.
Note: The input connector p of HEX.pipe_1.mediums[1] is not connected from the outside.
 It is likely that it should have been connected, and recursive check will assume this.
 The missing connection is a likely cause of errors in the model.
Note: The input connector h of HEX.pipe_1.mediums[1] is not connected from the outside.
 It is likely that it should have been connected, and recursive check will assume this.
 The missing connection is a likely cause of errors in the model.
The model has the same number of unknowns and equations.
Note: The input connector p of HEX.pipe_1.mediums[2] is not connected from the outside.
 It is likely that it should have been connected, and recursive check will assume this.
 The missing connection is a likely cause of errors in the model.
Note: The input connector h of HEX.pipe_1.mediums[2] is not connected from the outside.
 It is likely that it should have been connected, and recursive check will assume this.
 The missing connection is a likely cause of errors in the model.
The model has the same number of unknowns and equations.
The model Fluid_Test1_PHE_Temp7.Examples.HeatExchanger.HeatExchangerSimulation component HEX.pipe_1 is structurally singular.
when assuming the most generic outside couplings to all the flow variables of its connectors
and that non-physical connectors will impose suitable constraints.
The reported problems with connections are the likely cause of the singularity.
Singularity of Fluid_Test1_PHE_Temp7.Examples.HeatExchanger.HeatExchangerSimulation is in the component HEX.pipe_1, class Fluid_Test1_PHE_Temp7.Pipes.DynamicPipe.
ERROR: 3 errors were found
WARNING: 1 warning was issued

愿任何人都可以帮助我吗？我也可以通过Mail将模型发送给某人进行检查。

电贺乔治

Answer 1

我无法访问您的模型，但错误消息表明问题与HEX.pipe_1.mediums（这是一个数组）的连接有关。它们似乎不是（正确？）连接。

你有理由认为这不是问题吗？

此外，在进行任何更多测试之前，我还强烈建议您为HEX.pipe_1和HEX.pipe_2提供（非零）直径，并为传热模型的粗糙度组件提供“绑定方程” 。这些问题可能“掩盖”其他问题。

如果有帮助，请告诉我。

HeatExchanger-Simulation不起作用，无法理解错误消息

1 个答案: