Modeling and Simulation of Operational Faults of HVAC Systems Using Energyplus

TitleModeling and Simulation of Operational Faults of HVAC Systems Using Energyplus
Publication TypeConference Paper
Year of Publication2016
AuthorsZhang, Rongpeng, and Tianzhen Hong

HVAC operations play a significant role among various
driving factors to improve energy performance of
buildings. Extensive researches have been conducted on
the design efficiencies and control strategies of HVAC
system, but very few focused on the impacts of its
operational faults on the building energy efficiency.
Modeling and simulation of operational faults can lead
to better understandings of the fault impacts and thus
support decision making of timely fault corrections
which can further benefit the efficient system operation,
improve the indoor thermal comfort, and prolong the
equipment service life. Fault modeling is also critical to
achieve more accurate and reliable model calibrations.
This paper introduces the modeling and simulation of
operational faults using EnergyPlus, a comprehensive
whole building performance simulation tool. The paper
discusses the challenges of operational fault modeling,
and compares three approaches to simulate operational
faults using EnergyPlus. The paper also introduces the
latest development of native fault objects within
EnergyPlus. As an example, EnergyPlus version 8.4 is
used to investigate the impacts of the integrated
thermostat and humidistat faults in a typical office
building across several U.S. climate zones. The results
demonstrate that the faults create significant impacts on
the building energy performance as well as occupant
thermal comfort. At last, the paper introduces the future
development plan of EnergyPlus for the further
improvement of its fault modeling capability.

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