Record Display for the EPA National Library CatalogRECORD NUMBER: 42 OF 411
|Main Title||Constant volume sampling system water condensation /|
|Author||Black, F. M. ; Snow, R.|
|CORP Author||Environmental Protection Agency, Research Triangle Park, NC. Atmospheric Research and Exposure Assessment Lab. ;ManTech Environmental Technology, Inc., Research Triangle Park, NC.|
|Publisher||U.S. Environmental Protection Agency, Risk Reduction Engineering Laboratory,|
|Report Number||EPA 600/R-93/207.|
|Additional Subjects||Alternative fuels ; Vapor condensation ; Exhaust emissions ; Automobile exhaust ; Combustion products ; Flow rate ; Air pollution control ; Exhaust gases ; Motor vehicle engines ; Fuel economy ; Test stands ; Water ; Humidity ; Dynamometers ; Methanol ; CVS(Constant Volume Sampling) ; CNG(Compressed Natural Gas)|
Combustion of organic motor vehicle fuels produces carbon dioxide and water (H2O) vapor as well as products of incomplete combustion, like hydrocarbons and carbon monoxide. The Constant Volume Sampling (CVS) system, commonly used to condition auto exhaust for sampling and analysis, provides for controlled ambient air dilution of the engine exhaust. Water condensation can be a problem during CVS system sample conditioning, depending upon vehicle fuel composition and fuel economy, and diluent air humidity and exhaust/diluent ratio. The paper describes a 'spreadsheet' procedure for detailed, second by second, determination of diluted exhaust dew point and the necessary CVS system flow rates to avoid H2O vapor condensation.