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Single‐Zone Stack‐Dominated Infiltration Modeling
Author(s) -
Sherman Max
Publication year - 1992
Publication title -
indoor air
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.387
H-Index - 99
eISSN - 1600-0668
pISSN - 0905-6947
DOI - 10.1111/j.1600-0668.1992.00006.x
Subject(s) - leakage (economics) , dimensionless quantity , stack (abstract data type) , stack effect , superposition principle , mechanics , leakage power , mathematics , environmental science , statistical physics , geometry , computer science , mathematical analysis , physics , power (physics) , meteorology , thermodynamics , power consumption , economics , macroeconomics , programming language
This report derives an exact, but practical, expression for calculating the stack effect from air densities and leakage distribution using the power law formulation of envelope leakage. The neutral height‐the height at which there is no stack‐related indoor‐outdoor pressure difference‐is a key intermediate in stack modeling. This report defines a computable parameter called stack height, which contains all of the leakage distribution information necessary for estimating stack flows, thus freeing the model from specific assumptions (e.g. that the leakage is separable into evenly distributed floor, wall, and ceiling components). Example calculations, including comparisons with other models, as well as validations using measured data from dwellings, are also presented. The dimensionless neutral level, which is related to the neutral height, is often used as an indicator of leakage distribution and in superposition. Its definition and role in these instances are discussed in detail. The more exact formulation is then used to analyze the simple box cases normally assumed in infiltration modeling and other approximations. Measured ventilation data will be used to infer leakage distributions and neutral levels as well as for example calculations.