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
Abstract

HVAC operations play a significant role among variousdriving factors to improve energy performance ofbuildings. Extensive researches have been conducted onthe design efficiencies and control strategies of HVACsystem, but very few focused on the impacts of itsoperational faults on the building energy efficiency.Modeling and simulation of operational faults can leadto better understandings of the fault impacts and thussupport decision making of timely fault correctionswhich can further benefit the efficient system operation,improve the indoor thermal comfort, and prolong theequipment service life. Fault modeling is also critical toachieve more accurate and reliable model calibrations.This paper introduces the modeling and simulation ofoperational faults using EnergyPlus, a comprehensivewhole building performance simulation tool. The paperdiscusses the challenges of operational fault modeling,and compares three approaches to simulate operationalfaults using EnergyPlus. The paper also introduces thelatest development of native fault objects withinEnergyPlus. As an example, EnergyPlus version 8.4 isused to investigate the impacts of the integratedthermostat and humidistat faults in a typical officebuilding across several U.S. climate zones. The resultsdemonstrate that the faults create significant impacts onthe building energy performance as well as occupantthermal comfort. At last, the paper introduces the futuredevelopment plan of EnergyPlus for the furtherimprovement of its fault modeling capability.

LBNL Report Number

LBNL-1004498