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## Modelica - Fluid - Examples - HeatingSystem error

### Modelica - Fluid - Examples - HeatingSystem error

Hi

I downloaded the Windows version of OpenModelica v1.18.1 (64-bit)

I tried to run the HeatingSystem example in Fluid library but it fails every single time and these messages/errors show up

"[1] 16:04:19 Translation Warning

[Modelica.Fluid.Machines: 328:5-329:76]: The following equation is INCONSISTENT due to specified unit information: pump.delta_head_init = Modelica.Fluid.Examples.HeatingSystem.pump.flowCharacteristic(pump.V_flow_single_init * 1.1, {0.0, pump.V_flow_op, 1.5 * pump.V_flow_op}, {2.0 * pump.head_op, pump.head_op, 0.0}) - Modelica.Fluid.Examples.HeatingSystem.pump.flowCharacteristic(pump.V_flow_single_init, {0.0, pump.V_flow_op, 1.5 * pump.V_flow_op}, {2.0 * pump.head_op, pump.head_op, 0.0})

[2] 16:04:19 Translation Warning

The units of following sub-expressions need to be equal:

- sub-expression "pump.V_flow_single_init * 1.1" has unit "m"

- sub-expression "Modelica.Fluid.Examples.HeatingSystem.pump.flowCharacteristic().V_flow" has unit "m3/s"

[3] 16:04:19 Scripting Notification

Check of Modelica.Fluid.Examples.HeatingSystem completed successfully."

and

"Simulation process failed. Exited with code 0xffffffffffffffff.

Failed to solve the initialization problem with global homotopy with equidistant step size.

Unable to solve initialization problem.

simulation terminated by an assertion at initialization

Warning: maximal number of iteration reached but no root found

Matrix singular!

under-determined linear system not solvable!

Matrix singular!

under-determined linear system not solvable!

nonlinear system 499 fails: at t=0

proper start-values for some of the following iteration variables might help

Solving non-linear system 499 failed at time=0.

For more information please use -lv LOG_NLS."

Can you guys help me to understand what is going on?

Thanks

**Edited by:**Gargioni - Apr-29-22 20:10:41

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