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Estimating Real Time Diurnal Permeation from Constant Temperature Measurements
Technical Paper
2001-01-0730
ISSN: 0148-7191, e-ISSN: 2688-3627
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Sector:
Event:
SAE 2001 World Congress
Language:
English
Abstract
Using the results of Constant Temperature (CT) Permeation Measurements to estimate Real Time Diurnal (RTD) permeation emissions has a number of practical advantages. In particular, Constant Temperature measurements are easier to set up and control in a laboratory environment, and Constant Temperature measurements provide for data checks using simple self-consistency tests that are not possible with Real Time Diurnal measurements. Furthermore, there is no need to repeat permeation measurements for each separate real-time temperature profile of interest. The same two Constant Temperature measurements can be used to estimate permeation performance for many different temperature cycles - for example, the temperature cycles prescribed by CARB, EPA, and EEC, or the different temperature profiles experienced by separate fuel system components during a vehicle SHED test. This paper reviews the scientific basis for the procedure, discusses both its strengths and its limitations, and explains the applicability of Constant Temperature measurements to situations involving multi-component fuels and to fuel subsystems made of several different polymer materials.
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Authors
Citation
Lockhart, M., Nulman, M., and Rossi, G., "Estimating Real Time Diurnal Permeation from Constant Temperature Measurements," SAE Technical Paper 2001-01-0730, 2001, https://doi.org/10.4271/2001-01-0730.Also In
References
- United States Code of Federal Regulations
- California Code of Regulations “Standards and Test Procedures for Motor Vehicle Fuel Evaporative Emissions Evaporative Emission Standards and Test Procedures for 1978 and Subsequent Model Motor Vehicles
- MIN MAX MIN MAX
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- years miles
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- “Barrier Polymers” De Lassus P. Kirk-Othmer Encyclopedia of Chemical Technology Fourth Wiley 1992 3 946 948
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