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プレート熱交換器モデルをシミュレートしたいのですが、Modelica-Fluid-Library の default-Version を使用しています。デフォルト バージョンを指定するために、VDI Wärmeatlas 2006、Mm1 に従って、熱伝達 (Nusselt など) と圧力損失に必要なすべてのパラメーターと方程式を組み込みます。私は長い間、すべての間違いを見つけて修正しようとしましたが、ついに「デッドポイント」に到達しました。

エラーの最後のメッセージは次のとおりです。

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

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ゲオルグに挨拶

4

1 に答える 1

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モデルにアクセスできませんが、エラーメッセージは、問題がHEX.pipe_1.mediums（配列）への接続にあることを示しています。それらは（適切に？）接続されていないように見えます。

これが問題ではないと考える理由はありますか？

また、これ以上テストを行う前に、HEX.pipe_1とHEX.pipe_2の（ゼロ以外の）直径を提供し、熱伝達モデルの粗さコンポーネントの「結合方程式」を提供することを強くお勧めします。このような問題は、他の懸念を「覆い隠す」可能性があります。

それが役に立ったら教えてください。

于 2011-12-29T16:58:50.730 に答える