Article | Proceedings of The American Modelica Conference 2018, October 9-10, Somberg Conference Center, Cambridge MA, USA | Control Description Language Linköping University Electronic Press Conference Proceedings
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Title:
Control Description Language
Author:
Michael Wetter: Lawrence Berkeley National Laboratory, Energy Technologies Area, Building Technology and Urban Systems Division, Berkeley, CA, USA Milica Grahovac: Lawrence Berkeley National Laboratory, Energy Technologies Area, Building Technology and Urban Systems Division, Berkeley, CA, USA Jianjun Hu: Lawrence Berkeley National Laboratory, Energy Technologies Area, Building Technology and Urban Systems Division, Berkeley, CA, USA
DOI:
10.3384/ecp1815417
Download:
Full text (pdf)
Year:
2018
Conference:
Proceedings of The American Modelica Conference 2018, October 9-10, Somberg Conference Center, Cambridge MA, USA
Issue:
154
Article no.:
002
Pages:
17-26
No. of pages:
10
Publication type:
Abstract and Fulltext
Published:
2019-02-26
ISBN:
978-91-7685-148-7
Series:
Linköping Electronic Conference Proceedings
ISSN (print):
1650-3686
ISSN (online):
1650-3740
Publisher:
Linköping University Electronic Press, Linköpings universitet


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Properly designed and implemented building control sequences can significantly reduce energy consumption. However, there is currently no process with supporting tools that allows the assessment of the performance of different control sequences, export the control sequences in a vendor-neutral format for cost estimation and for implementation on a building automation system through machine-to-machine translation, and reuse the sequences for verification during commissioning.

This paper describes a Control Description Language (CDL) that we developed to create such a process. For CDL, we selected a subset of Modelica that allows a convenient representation of control sequences, simulation of the control sequence coupled to a building energy model, and development of translators from CDL to building automation systems. To aid in the development of such translators, we created a translator from CDL to a JSON intermediate format. In future work, we seek to work with building control providers to develop translators from CDL to commercial building automation systems.

Through a case study, we show that CDL suffices for simulation-based performance assessment of two ASHRAE-published control sequences for a variable air volume flow system of an office building. Moreover, the case study showed that merely due to differences in the control sequences, annual HVAC energy use was reduced by 30%. This difference is larger than the accuracy required when comparing different HVAC systems, thereby questioning the current practice of idealizing control sequences in building energy simulations, and demonstrating the importance of ensuring that the control sequence used during design simulations corresponds to the control sequence that will be implemented in the real building.



Keywords: controls, buildings, HVAC

Proceedings of The American Modelica Conference 2018, October 9-10, Somberg Conference Center, Cambridge MA, USA

Author:
Michael Wetter, Milica Grahovac, Jianjun Hu
Title:
Control Description Language
DOI:
http://dx.doi.org/10.3384/ecp1815417
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Proceedings of The American Modelica Conference 2018, October 9-10, Somberg Conference Center, Cambridge MA, USA

Author:
Michael Wetter, Milica Grahovac, Jianjun Hu
Title:
Control Description Language
DOI:
https://doi.org10.3384/ecp1815417
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