title: Location identification for indoor instantaneous point contaminant source by probability-based inverse Computational Fluid Dynamics modeling.
abstract: Indoor pollutions jeopardize human health and welfare and may even cause serious morbidity and mortality under extreme conditions. To effectively control and improve indoor environment quality requires immediate interpretation of pollutant sensor readings and accurate identification of indoor pollution history and source characteristics (e.g. source location and release time). This procedure is complicated by non-uniform and dynamic contaminant indoor dispersion behaviors as well as diverse sensor network distributions. This paper introduces a probability concept based inverse modeling method that is able to identify the source location for an instantaneous point source placed in an enclosed environment with known source release time. The study presents the mathematical models that address three different sensing scenarios: sensors without concentration readings, sensors with spatial concentration readings, and sensors with temporal concentration readings. The paper demonstrates the inverse modeling method and algorithm with two case studies: air pollution in an office space and in an aircraft cabin. The predictions were successfully verified against the forward simulation settings, indicating good capability of the method in finding indoor pollutant sources. The research lays a solid ground for further study of the method for more complicated indoor contamination problems.
  
  
  CONCLUSIONS
  The method developed can help track indoor contaminant source location with limited sensor outputs. This will ensure an effective and prompt execution of building control strategies and thus achieve a healthy and safe indoor environment. The method can also assist the design of optimal sensor networks.
authors.affiliation: Department of Civil, Environmental and Architectural Engineering, University of Colorado, Boulder, CO 80309-0428, USA.
authors.forename: X
authors.initials: X
authors.lastname: Liu
authors.forename: Z
authors.initials: Z
authors.lastname: Zhai
mesh_terms: D000392:Air Movements; D000393:Air Pollutants; D016902:Air Pollution, Indoor / Q000706:statistics & numerical data*; D000401:Aircraft / Q000706:statistics & numerical data; D003198:Computer Simulation; D004781:Environmental Exposure / Q000706:statistics & numerical data; D006801:Humans; D008962:Models, Theoretical; D017132:Workplace
chemical_list: D000393:Air Pollutants