TITLE

Wavelet Neural Network-Based Fault Diagnosis in Air-Handling Units

AUTHOR(S)
Zhimin Du; Xinqiao Jin; Yunyu Yang
PUB. DATE
November 2008
SOURCE
HVAC&R Research;Nov2008, Vol. 14 Issue 6, p959
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Various sensor faults in long-term used heating, ventilation, and air-conditioning systems usually lead to a waste of energy consumption or decrease in indoor air quality. A wavelet neural network, which combines wavelet analysis with a neural network, is presented to diagnose the fixed and drifting biases of sensors in an air-handling unit. Wavelet analysis is employed to process measurement data, and a neural network is used to diagnose sensor faults. First, an abundance of historical data, under both normal and faulty operation conditions, are selected from the building automation systems as the training data. Wavelet analysis is employed to decompose these original data, and the eigen vector matrix representing the operation characteristic information of the air-handling unit is obtained. Then, the neural network is trained to learn various conditions using the eigen vectors and to distinguish between normal and faulty conditions. When new measurements are obtained, they are decomposed similarly using wavelet analysis. The new characteristic information after decomposition is selected as the input of the well-trained network Finally, the outputs corresponding to the new condition are calculated out of the neural network The diagnosis or identification is carried out by comparing these outputs with the objective vectors. Simulation tests in this paper show that wavelet neural networks can successfully diagnose fixed and drifting biases of sensors in air-handling units.
ACCESSION #
35865652

 

Related Articles

  • Comparative Study of Protocols and Control Methods in Energy Efficient Building Automation Systems. Bangali, Jayashri A.; Shaligram, Arvind D. // Advances in Computational Sciences & Technology;2012, Vol. 5 Issue 2, p883 

    In recent years, due to the energy crises, the recognition of energy sources is limited and there is the tendency to have cleaner and comfortable environment leading to development in using energy as optimally as possible. The key driver of the building automation market is the promise of...

  • Comfort, Energy Consumption,and Economics of a School with Energy Recovery. Fauchoux, Melanie; Simonson, Carey; Torvi, David // ASHRAE Transactions;2009, Vol. 115 Issue 2, p519 

    Energy wheels are often used to reduce energy consumption and HVAC equipment capacities in buildings, but the effect of the energy wheel on the indoor comfort conditions has not been studied in detail. The addition of an energy wheel to the HVAC system may improve the indoor air relative...

  • The First Step of Demand Control Ventilation in an Animal Facility in Japan: Design and Commissioning for Flexible Ventilation. Masaya Ishihara; Jun-ya Muraki // ASHRAE Transactions;2014, Vol. 120 Issue 1, p1 

    Energy saving is one of the most important issues of animal facilities because a lot of energy is used in order to provide good indoor air quality (IAQ). Demand control ventilation (DCV) is expected to save energy by reducing ventilation rates in accordance with animal occupancy or other IAQ...

  • Occupancy Based Control Strategy for Variable-Air-Volume (VAV) Terminal Box Systems. Liu, Guopeng; Brambley, Michael R. // ASHRAE Transactions;2011, Vol. 117 Issue 2, p244 

    The terminal box (TB) is one of the key components in variable-air-volume (VAV) systems. The minimum air flow set point of the VAV TB is an important factor to determining thermal comfort, indoor air quality and energy consumption. The newly developed occupancy based air distribution system...

  • Spring Tune-Up For Your BAS? Ehrlich, Paul // Engineered Systems;May2014, Vol. 31 Issue 5, p19 

    The article presents information on key issues HVAC (heating, ventilation, and air conditioning) engineers look at when evaluating existing building automation system (BAS) and control systems. It is suggested that regular inspection, updates, and knowledge on the use of a BAS significantly...

  • Back to Basics. McKew, Howard J. // Engineered Systems;Dec2005, Vol. 22 Issue 12, p12 

    The article offers hints on how companies can achieve the long-term success of a building automation system (BAS). It describes the design phase, the commissioning phase and the trending points. Some of the preventive maintenance issues include carbon dioxide cycle, BAS computer trending space...

  • 3 energy-saving strategies for laboratory exhaust systems. Valbracht, Robert A.; Cochran, Brad C.; Reifschneider, Jeff D. // Consulting-Specifying Engineer;Oct2009, Vol. 46 Issue 4, Special section p9 

    The article offers ways to reduce the energy consumption of laboratory exhaust systems in the U.S. The variable air volume (VAV) system design option uses either tall stacks or optimizes air intake placement to mitigate exhaust re-entrainment. The Building Automation System (BAS) connection to...

  • Project Files: City Automation.  // Air Conditioning, Heating & Refrigeration News;11/14/2011, Vol. 244 Issue 11, p4 

    The article profiles the project for the city automation in Merced, California particularly its 17 main city buildings, seven city parks, and the Merced Regional Airport in an effort to lessen the energy consumption while supporting its local jobs.

  • VAV Coils, Fan Coil Devices. INT-HOUT, DAN // ASHRAE Journal;Jan2014, Vol. 56 Issue 1, p58 

    The article focuses on the challenges that can be confronted in the specification and proper design of Variable Air Volume (VAV) terminals or fan coil devices. It discusses several things that affect the said design and specification including energy consumption, discharge air temperatures,...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics