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2019 07 10 library development

Michael Wetter edited this page Jul 10, 2019 · 5 revisions

IBPSA Modelica Library Coordination

Date: July 10, 2019, 8am-9am Pacific Times The purpose of this meeting is to coordinate the development https://github.com/ibpsa/modelica-ibpsa

Meeting information

Join from PC, Mac, Linux, iOS or Android: https://lbnl.zoom.us/my/mwetter

Or iPhone one-tap (US Toll): +14086380968,6614042296# or +16465588656,6614042296#

Or Telephone:
Dial: +1 408 638 0968 (US Toll) or +1 646 558 8656 (US Toll) Meeting ID: 661 404 2296 International numbers available: https://lbnl.zoom.us/zoomconference?m=_h5BuJ686mPy3rWEyKf4NROxLaeOV5J8

Agenda

  1. Update to Dymola 2020
  2. Block to overwrite and to send control signals (https://github.com/ibpsa/modelica-ibpsa/issues/1059).
  3. Condensing coil model.
  4. Regression testing
  5. Actuator model revision
  6. Update about refactoring of regression tests.
  7. New media in Pull Request for R410A, R134a, R290 and R744 from Aachen (Christian).
  8. Geothermal model
  9. Open pull requests and issues at https://github.com/ibpsa/modelica-ibpsa/issues

Participants

Massimo Cimmino
Antoine Gautier
Jianjun Hu
Donghun Kim
Yash Shukla
Michael Wetter
Christian Vering

Minutes

Update to Dymola 2020 and MSL 3.2.3

Once final version is released, update CI testing and make pull request. Tentatively to be done in August.

Block to overwrite control signals

Michael and Filip to review and merge pull request.

Condensing coil model

Discussion of https://github.com/ibpsa/modelica-ibpsa/issues/1109#issuecomment-507283640

Donghun is looking at numerical issues and also on moving boundary approaches for partially wet coils.

Regression testing

Funnel is now integrated in BuildingsPy. All unit tests and plots are reported in html as a stream to html. Pending is last review by Filip and then process https://github.com/ibpsa/modelica-ibpsa/pull/1167

After the merge, the master branch of the IBPSA library need to be merged to all development branches (due to a new flag of BuildingsPy that suppresses the result verification for JModelica). Otherwise the CI tests will fail.

Need to design how/where to store results on a server.

Actuator model revision

No discussions.

PR is done for damper model, but numerical problems exist in one of the regression tests that computes slow. More iteration steps are taken inside the central flow domain where the flow rate is computed as a fraction of the nominal value plus a regularization term. The issue seems related to the regularization coefficient which scales with the inverse of the pressure drop difference between fully closed and fully open position for the required flow rate. When the required flow rate is close to nominal this leads to a very low order of magnitude.

New media R290

No update from Aachen. Christian is now merging new refrigerants (R410A, R134a, R290 and R744), pull request should be done later this week.

Bo Shen from ORNL developed a Media library that calls refprop.

Geothermal model

In September will have a student working on borefield modeling.

Will series connections be added for borefield. Massimo plans to work on it with a new student.

Open issues

See https://github.com/ibpsa/modelica-ibpsa/issues

New action items

Antoine to make PR to change "Nominal condition" to "Nominal conditions", and "Flow Coefficient" to "Flow coefficients".

Previous action items

Michael to make last review of block to overwrite control signals and then PR to merge to master branch (https://github.com/ibpsa/modelica-ibpsa/issues/1059).

Michael to update to Dymola 2020 when it is released.

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