Abstract
Approximately 38% of the energy consumed in the United States is used in buildings. Much of this energy can be saved by reducing buildings` air infiltration and ventilation, since the heat load associated with these processes is about 13 quads per year. However, because ventilation is the dominant mechanism for removing pollutants that originate indoors, reducing ventilation can cause undesirable side effects such as lowering indoor air quality and adversely affecting the health, comfort and productivity of building occupants. The purpose of this research is to increase the energy efficiency of buildings while maintaining or improving occupant health and comfort. The research explores energy use and efficiency of buildings; building ventilation and infiltration; the nature, sources, transport, transformation, and deposition of indoor air pollutants; and exposure and risk assessment for indoor air pollutants. Pollutants of particular interest include radon; volatile, semi-volatile and particulate organic compounds; and combustion emissions, including environmental tobacco smoke, CO, and NO{sub x}. The Program also conducts multidisciplinary studies on relationships between occupant health and comfort symptoms and factors within a building`s environment. Air infiltration and ventilation rates are measured and modeled for residential and commercial buildings in order to understand energy transport and thermal losses from various components of building shells and ventilation systems. Methods for reducing energy losses are based on these studies. The effectiveness of various ventilation systems for pollutant removal is also investigated. Methods for characterizing ventilation and building energy use are developed for experimental and applied uses.
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