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2018 02 20 tag agenda
Date: February 20, 2018, 1pm-3pm PST (web conference)
Slides are posted at https://github.com/lbl-srg/obc/tree/master/meetings/2018-02-20-tag
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- 1st case study and dissemination (start at 1pm)
- Guideline 36 release
- Next case study (1:10 pm)
- Chiller plant sequences (1:35)
- CDL export (2:00)
- Verification (2:10)
- Design tool (2:20)
- Timeline (2:35)
- Open discussion (2:40)
- Michael Wetter
- Paul Ehrlich
- Philip Haves
- Jianjun Hu
- Milica Grahovac
- Paul Switenski
- Brent Eubanks
- Jay Santos
- Mark Hydeman
- Marina Sofos
- Gerry Hamilton
- Janie Page
- Ira Goldschmidt
- Karen Perin
- Dave Robin
- Charles Holleran
- Rick Fixme
- David Prichard
Michael presented the main inputs, methodology and outcomes of the secondary sequence comparative case study. David Prichard asked about any industry interest in the CDL translation.
Michael described the desired setup of the case study and the necessary inputs. Suggesting chilled water plant coupled to building loads. Targets are to demonstrate that LBL team can translate CDL, generate English language translation and go all the way to a product line. About potential chiller load data sources: Phil mentions Hamilton/Stanford - a possibility to extract loads on the central chilled water plant (building 2) - apply Steve’s 1711 sequences; an another option are Francisco's Oracle buildings with possibly good data. Fixme: there was an another data source I did not catch, but you guys wrote it down. Rick says they are commissioning chiller plants for hospitals in Vermont. Phil introduces chiller sequence source (ASHRAE RP-1711). Paul on the selection of the building - expresses concern about the scope of the case study. Michael elaborates on feasible steps (use model in the loop, demonstrate CDL export in English language). Gerry says it’s a bit difficult to find a building that has 2 chillers, 2 boilers, 2 cooling towers. Most Stanford buildings have district cooling/heating.
Michael provides an intro and introduces sequences obtained from from David Prichard and Steve Taylor. Jianjun explains how the LBL team interprets the sequence and the explains the intended implementation. TAG raises questions about the absence of the water side economizer and a lacking a condenser water side startup valve.
VSD issues (chiller, CHWP, CHP) - TAG suggests either all VFD or no VFD on the CW side. Arguments are raised that chillers and cooling towers should be VFD (due to federal/state/local codes). Mark suggests to stick to 2 identical chillers with a WSE and VFD and 2 boilers. It is usual to have identical chillers if the plant has 2 chillers. Discussion on pros and cons of both advanced/high performance sequences (demonstrate new capabilities) and conventional/solid sequence (just having them work properly). Ira: LBL’s sketch shows a typical chiller plant that’s “slightly cutting edge”.
Michael presents diagrams that explain the approaches to sequence translation and does a demo of how the English language documentation gets generated. TAG seems very interested and would like to review the current status. Rick raises some translation issues if the functional block implementations in different languages take different sets of inputs. Michael suggests a few solutions, such as replacing CDL say PID blocks with a Niagara PID block, although some compatibility issues may remain. Discussion on compatibility extends, but TAG agrees some issues need to remain outside of the project scope. TAG raises validation concerns if replacing CDL blocks with proprietary ones in terms of loss of quality.
Michael presented the sequence verification concept.
Phil reports on Control Design Tool scoping. Paul presents a list of useful deliverables. Discussion about the unfamiliarity with some of the tools involved.
Select a building that can provide real building performance data suitable for implementation of real chiller control sequences
Q.6. Demonstration with actual measured control response (need any input signals that go into and out of the controller, as well as controller parameters, such as control gains). In absence of such data, we’d like an alternative simple control sequence, so that we can do a comparative study.