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2018 06 14 library development

Michael Wetter edited this page Jun 15, 2018 · 6 revisions

IBPSA Modelica Library Coordination

Date: June 14, 2018, 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. IBPSA library release 2.0.0
  2. Glycol concentration is mass fraction. Is this customary, should volume fraction be used, what uses EnergyPlus?
  3. New borefield model. See https://github.com/ibpsa/modelica-ibpsa/tree/issue422b_borefield
  4. Block to overwrite and to send control signals via web request. See https://github.com/ibpsa/modelica-ibpsa/issues/926
  5. Update to Dymola 2019
  6. Dirk Zimmer's paper "Robust modeling of directed thermofluid flows in complex networks", page 39 at https://www.modelica.org/events/modelica2018japan/conference-proceedings/modelica-final-proceedings-2018-Japan.pdf
  7. Library restructuring: https://github.com/ibpsa/modelica-ibpsa/issues/778
  8. Open pull requests and issues at https://github.com/ibpsa/modelica-ibpsa/issues

Participants

Massimo Cimmino
Bram van der Heijde
Filip Jorissen
Moritz Lauster
Damien Picard
Christian Vering
Michael Wetter

Minutes

Release

Make 2.0.0 release, and after the non-backward compatible changes are merged, we can do another release when needed by IDEAS or AixLib.

New models

See also https://github.com/ibpsa/project1/wiki/2018-02-27-expert-meeting-agenda#wp-11

Antifreeze

EnergyPlus uses mass fraction for antifreeze, hence no change is needed to the current implementation of the antifreeze.

Borefield (New implementation of model)

Close agreement between analytical solution and FD for radial heat conduction. MPC requires to update the soil temperatures near the borehole, which may be obtained from the analytical solution. Needs further discussion about how to update temperature near borehole for MPC in order to have a correct computation.

Overwriting of control signals

No discussion, awaiting for pull request to further review.

Dymola 2019

Michael to update the reference results for Dymola 2019. Plan is to do it next week.

DHC substations

No discussion.

Heat pumps

No discussion.

Dirk Zimmer's paper

Michael presented initial implementation. Source and sink are now two different models. Need to understand if or when oscillations can occur. The fast dynamics are not good if models are used with MPC. This needs further analysis.

Library restructuring

No discussion.

Open issues

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

New action items

Michael to make release 2.0.0.

Michael to update reference results for Dymola 2019.

Previous action items

None.

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