| Main Title |
Particulate Measurement - Dilution Tunnel Stabilization. |
| Author |
Danielson, Eugene ;
|
| CORP Author |
Environmental Protection Agency, Ann Arbor, MI. Standards Development and Support Branch. |
| Year Published |
1978 |
| Report Number |
LTDP-78-14; |
| Stock Number |
PB-289 879 |
| Additional Subjects |
Particles ;
Air pollution ;
Stability ;
Concentration(Composition) ;
Exhaust emissions ;
Dilution tunnels
|
| Holdings |
| Library |
Call Number |
Additional Info |
Location |
Last
Modified |
Checkout
Status |
| NTIS |
PB-289 879 |
Some EPA libraries have a fiche copy filed under the call number shown. |
|
07/26/2022 |
|
| Collation |
6p |
| Abstract |
Particulate testing was conducted to determine the number of hot-start UDDS (LA-4) cycles that must be driven to stabilize a clean 18-inch diameter dilution tunnel. The results of this investigation indicate that valid particulate measurements can be obtained with a clean dilution tunnel; i.e., essentially no LA-4 cycles are required to stabilize the dilution tunnel with respect to particulate material. This conclusion is based on the observation that slightly higher than average particulate levels (taken with stabilized tunnel) were measured during the first (actually first two) LA-4 test after tunnel cleaning. If particulate material is being lost to the dilution tunnel walls it is minimal and not significant compared to normal test variability. |
