Centralized management of HVAC energy in large Multi-AHU Zones

Srinarayana Nagarathinam, Arunchandar Vasan, P. Venkata Ramakrishna, Shiva R. Iyer, Venkatesh Sarangan, Anand Sivasubramaniam

Research output: Chapter in Book/Report/Conference proceedingConference contribution

8 Scopus citations

Abstract

HVAC control strategies that exploit temporal variations in zone occupancy have been well studied. However, at a given time, occupancy can also vary spatially within a single large zone with no internal wall partitions, that is served by multiple AHUs. We complement prior work by studying how spatial variations in a large zone can be leveraged to save energy and improve occupant comfort. Specifically, we propose a novel strategy for centralized reactive control of all the AHUs serving a large zone, MAZIC (Multi- AHU Zone Intelligent Control). To decide control outputs, we use a thermal model to capture the mixing of heat loads across different regions of the large zone served by different AHUs. We study MAZIC's performance in terms of energy consumption and comfort using real-world occupancy data. When the spatial skew in occupancy is high, MAZIC reduces energy consumption by 11% over individual PID controllers running at each AHU, while maintaining similar comfort levels. Sensing temperature and occupancy at finer spatial resolution helps both MAZIC and PID controllers to save more energy when the occupancy is skewed. Finer spatial sensing does not add much value when the occupancy is not so skewed. We also find that augmenting MAZIC with a MPC (Model Predictive Control) approach yields insignificant improvement (< 3%) during normal occupancy. With ON-OFF occupancy patterns, MPC improves energy savings by up to ∼ 6% over reactive MAZIC.

Original languageEnglish (US)
Title of host publicationBuildSys 2015 - Proceedings of the 2nd ACM International Conference on Embedded Systems for Energy-Efficient Built
PublisherAssociation for Computing Machinery, Inc
Pages157-166
Number of pages10
ISBN (Electronic)9781450339810
DOIs
StatePublished - Nov 4 2015
Event2nd ACM International Conference on Embedded Systems for Energy-Efficient Built, BuildSys 2015 - Seoul, Korea, Republic of
Duration: Nov 4 2015Nov 5 2015

Publication series

NameBuildSys 2015 - Proceedings of the 2nd ACM International Conference on Embedded Systems for Energy-Efficient Built

Other

Other2nd ACM International Conference on Embedded Systems for Energy-Efficient Built, BuildSys 2015
CountryKorea, Republic of
CitySeoul
Period11/4/1511/5/15

All Science Journal Classification (ASJC) codes

  • Information Systems
  • Architecture
  • Building and Construction

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  • Cite this

    Nagarathinam, S., Vasan, A., Venkata Ramakrishna, P., Iyer, S. R., Sarangan, V., & Sivasubramaniam, A. (2015). Centralized management of HVAC energy in large Multi-AHU Zones. In BuildSys 2015 - Proceedings of the 2nd ACM International Conference on Embedded Systems for Energy-Efficient Built (pp. 157-166). (BuildSys 2015 - Proceedings of the 2nd ACM International Conference on Embedded Systems for Energy-Efficient Built). Association for Computing Machinery, Inc. https://doi.org/10.1145/2821650.2821655