| Author | Prapat Pongkiatkul |
| Call Number | AIT Thesis no.EV-01-16 |
| Subject(s) | Diesel motor exhaust gas--Environmental aspects
|
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of
Engineering, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Abstract | It is widely known that exhaust gas from both diesel trucks and buses in Bangkok have
potentials to cause severe health effect. This study focused on the upward extension of
exhaust pipe to level above the bus roof level in order to reduce the concentration of
pollutants at the breathing level.
Ambient concentration of carbon monoxide, hydrocarbon, and PMlO were monitored to
estimate the contribution from a running bus with original and upward extended exhaust pipes
in free flow highway, Chiang Rak Noi road, and street canyon case, Pracha U-Thit road.
Sampling point was located at a distance of three meters from the running bus lane on the
downwind roadside and at one-meter height. The data was recorded every second while the
study bus was running at stable speeds of 20, 40, 60 and 80 km/hr. Wind speed and wind
direction data was also recorded for every bus speed. Upward extension of exhaust pipe
resulted in lower ambient pollutant concentrations as compare to the original exhaust pipe at
the Chiang Rak Noi road and the Pracha U-Thit road. However changes in wind speed and
directions between the measurement may caused the incompatibility of the results between
the 2 cases. Mathematical model was applied to predict the concentration at downwind
distances using Gaussain dispersion equation. The on-road emission measurement was
conducted for the model input.
Measurement and modeling results showed that the upward extension of exhaust pipe can
reduce the ambient concentration at the breathing level. Modeling result showed that the
extension of exhaust pipe, 3.95 meters, can reduce ambient concentration of carbon monoxide
and hydrocarbon at breathing level by a factor of around 3. The ratio between maximum
concentration from measurement data and modeling result varies in the range of 2-186.
Most of public opinions agree with the adaptation of the technology. The cost of installation
varies from 1500 to 2000 Baht. The cost for rerouting exhaust pipe in the bus is estimated to
be in the range of 10000 to 20000 Baht. For a truck, the cost ranges from 2000 to 3000 Baht
for a steel pipe and from 10000 to 15000 Baht for stainless pipe. |
| Year | 2001 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Department of Energy and Climate Change (Former title: Department of Energy, Environment, and Climate Change (DEECC)) |
| Academic Program/FoS | Environmental Engineering and Management (EV) |
| Chairperson(s) | Oanh, Nguyen Thi Kim |
| Examination Committee(s) | Samorn Muttamara;Supat Wangwongwatana |
| Scholarship Donor(s) | German Scholarship |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2001 |