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modelica / ModelicaStandardLibrary

Free (standard conforming) library to model mechanical (1D/3D), electrical (analog, digital, machines), magnetic, thermal, fluid, control systems and hierarchical state machines. Also numerical functions and functions for strings, files and streams are included.
https://doc.modelica.org
BSD 3-Clause "New" or "Revised" License
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Refine temperature dependency modelling #287

Open modelica-trac-importer opened 7 years ago

modelica-trac-importer commented 7 years ago

Reported by AHaumer on 12 Feb 2010 18:29 UTC The following can only be done when a conversion script is allowed, and holds not only for Electrical but also for Modelica.Thermal.HeatTransfer.Sources.Fixed/PrescribedHeatFlow:

  1. We should choose a consistent default / start value for all reference temperatures of 20 degC = 293.15 K (27 degC = 300.15 K has no meaning to me).

  2. We should define the LinearTemperatureCoefficient alpha consistently at 20 degC = 293.15 K (not at reference temperature).

Such a material coefficient can be found in material databases defined at 20 degC, not at other temperatures. I have attached a document that shows how alpha can be converted from 20 degC to an other reference temperature.

LinearTemperatureDependency.pdf

Migrated-From: https://trac.modelica.org/Modelica/ticket/287

modelica-trac-importer commented 7 years ago

Modified by AHaumer on 12 Feb 2010 18:32 UTC

modelica-trac-importer commented 7 years ago

Comment by dietmarw on 1 Aug 2015 21:36 UTC Milestone renamed

modelica-trac-importer commented 7 years ago

Comment by dietmarw on 1 Aug 2015 21:39 UTC Milestone renamed

modelica-trac-importer commented 7 years ago

Modified by ahaumer on 20 Dec 2016 16:49 UTC

modelica-trac-importer commented 7 years ago

Changelog removed by ahaumer on 20 Dec 2016 16:49 UTC

beutlich commented 7 years ago

Restored attachment LinearTemperatureDependency.pdf.

christophclauss commented 5 years ago

The remaining time to MSL4.0.0 seems to be too short for me. I'd like postpone this issue.