Dymola - No event error for heat exchangers

asked 2018-01-27 02:23:11 -0500

RicardoPereira gravatar image

Anyone has already faced this error?

noEvent(abs(station.hex.Q1_flow) < 836800.0*max(3.586800573888092E-006, abs(station.hex.port_a2.m_flow))) The following error was detected at time: 14394150.45868399 Energy may not be conserved for small mass flow rates. The implementation may require prescribedHeatFlowRate = false. Solver will attempt to handle this problem.

noEvent(abs(station.hex.Q1_flow) < 836800.0*max(3.586800573888092E-006, abs(station.hex.port_a2.m_flow))) The following error was detected at time: 14394671.87665271 Energy may not be conserved for small mass flow rates. The implementation may require prescribedHeatFlowRate = false. Solver will attempt to handle this problem.

station1.pumpDHN.phi > -0.2 The following error was detected at time: 14483651.91603983 Valve control signal needs to be bigger than zero, received phi = -0.2 Integration terminated before reaching "StopTime" at T = 1.45e+07

I am trying to run the BuildingSystems district heating example DistrictNetwork_dp in Dymola the model runs for more than 100 days, but stops with this problem.

any help? thanks

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