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Title: Air infiltration in buildings

Abstract

A physical model of infiltration in buildings that can be used to predict the infiltration for a wide range of construction types and climate regions is presented. The problems associated with commonly-used tracer gas methods for measuring infiltration were examined in detail so that results obtained from the model could be properly compared with actual measurements. In addition, a simple model of the hydrodynamics of typical leaks in the building envelope was devised in order to study the physical processes of infiltration (i.e., the flow of air through cracks in the structure of the building). Finally, a method for quantifying the leakage of the building envelope (the quantity analogous to envelope thermal conductance) was developed. The name given to this measurement technique is AC pressurization. Although other methods exist for measuring the leakage of a building envelope, AC pressurization is far more accurate and can be used at lower pressures than any existing methods. The model, based on the determination of the effective leakage area, was used to predict the infiltration at 15 separate sites. Pressurization was used to calculate leakage area and then was used to calculate infiltration. Findings were then compared to direct measurements of infiltration at themore » sites. Agreement between the model and direct measurement by tracer gas techniques was +- 20% overall - a degree of accuracy far surpassing any previous model of infiltration capable of being generally applied.« less

Authors:
Publication Date:
Research Org.:
Lawrence Berkeley Lab., CA (USA)
OSTI Identifier:
6370839
Report Number(s):
LBL-10712
ON: DE81023033
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Technical Report
Resource Relation:
Other Information: Thesis
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; AIR INFILTRATION; CALCULATION METHODS; MEASURING METHODS; SIMULATION; BUILDINGS; AIR FLOW; DATA; HOUSES; HYDRODYNAMICS; INDOOR AIR POLLUTION; LEAK TESTING; LEAKS; MATHEMATICAL MODELS; PRESSURIZING; TRACER TECHNIQUES; VENTILATION; WEATHER; AIR POLLUTION; FLUID FLOW; FLUID MECHANICS; GAS FLOW; INFORMATION; ISOTOPE APPLICATIONS; MECHANICS; POLLUTION; RESIDENTIAL BUILDINGS; TESTING; 320100* - Energy Conservation, Consumption, & Utilization- Buildings

Citation Formats

Sherman, M H. Air infiltration in buildings. United States: N. p., 1980. Web.
Sherman, M H. Air infiltration in buildings. United States.
Sherman, M H. 1980. "Air infiltration in buildings". United States.
@article{osti_6370839,
title = {Air infiltration in buildings},
author = {Sherman, M H},
abstractNote = {A physical model of infiltration in buildings that can be used to predict the infiltration for a wide range of construction types and climate regions is presented. The problems associated with commonly-used tracer gas methods for measuring infiltration were examined in detail so that results obtained from the model could be properly compared with actual measurements. In addition, a simple model of the hydrodynamics of typical leaks in the building envelope was devised in order to study the physical processes of infiltration (i.e., the flow of air through cracks in the structure of the building). Finally, a method for quantifying the leakage of the building envelope (the quantity analogous to envelope thermal conductance) was developed. The name given to this measurement technique is AC pressurization. Although other methods exist for measuring the leakage of a building envelope, AC pressurization is far more accurate and can be used at lower pressures than any existing methods. The model, based on the determination of the effective leakage area, was used to predict the infiltration at 15 separate sites. Pressurization was used to calculate leakage area and then was used to calculate infiltration. Findings were then compared to direct measurements of infiltration at the sites. Agreement between the model and direct measurement by tracer gas techniques was +- 20% overall - a degree of accuracy far surpassing any previous model of infiltration capable of being generally applied.},
doi = {},
url = {https://www.osti.gov/biblio/6370839}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1980},
month = {10}
}

Technical Report:
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