- Author
-
Axley, J.
- Title
- Progress Toward a General Analytical Method for Predicting Indoor Air Pollution in Buildings--Indoor Air Quality Modeling. Phase 3 Report.
- Coporate
- National Bureau of Standards, Gaithersburg, MD
- Report
-
NBSIR 88-3814
July 1988
124 p.
- Distribution
- Available from National Technical Information Service
- Keywords
-
contaminant dispersal analysis
|
inverse contaminant dispersal analysis
|
tracer gas techniques
|
building simulation
|
one dimensional flow
- Abstract
- This interim report presents the results of Phase 3 of the NBS General Indoor Air Pollution Concentration Model Project. It describes: a) a general element-assembly formulation of multi-zone contaminant dispersal analysis theory that provides a general framework for the development of detailed (element) models of mass transport phenomena that may affect contaminant dispersal in buildings; b) an approach to modeling the dispersal of interactive contaminants invloving contaminant mass transport phenomena governed by basic principals of kinetics and introduces a linerar first order kinetics element to achieve this end; c) an approach to modeling the details of contaminant dispersal driven by convection-diffusion processes in one-dimensional flow situations (e.g., HVAC ductwork) and introduces a convection-diffusion flow element to achieve this end; and d) the features and use of CONTAM87, a program that provides a computational implementation of the theory and methods discussed. The theory and methods presented are based upon a generalization of the building idealization employed earlier [Axley, 1987]. Here, building air flow systems are idealized as assemblages of mass transport elements, rather than simply flow elements as used previously, connected to discrete system nodes corresponding to well-mixed air zones within the building and its HVAC system. Equations governing contaminant dispersal in the whole building air flow system due to air flow and reaction or sorption mass transport phenomena are formulated by assembling element equations, that characterize a specific instance of mass transport in the building air flow system, in such a manner that the fundamental requirement of conservation of mass is satisified in each zone.