The objective of this research is to study the combustion behavior of a gas-saving burner S-10 using computational fluid dynamics (CFD). The simulation model was created using Fluent 6.3 in 3D-model of the same size of the burner. LPG pressure of 4 psi was released for this study. The combustion behavior was shown in temperature contour and velocity vector. The CFD results were verified by measuring the temperature around the burner head with a vessel. From the study it was found that the CFD’s results of flow velocity and combustion temperature distributions were validated with the experimental values. The CFD’s result errors were less than 10.35% and 11.87% comparing with the velocity and temperature measurement respectively. The fluid flow and combustion behaviors can be described by this CFD model. Moreover the CFD model of the gas-saving burner S-10 can be applied to improve the thermal efficiency of the burner in the future.

The objective of this research is to study the combustion characteristic of a low-pressure vertical port burner using computational fluid dynamics (CFD). The simulation model was created using Fluent 6.3 in 3D-model of the same size of the burner. The CFD results were verified by measuring the temperature around the burner head and a vessel. Moreover the results of conventional vertical port burner having the swirl angle of 90o and the inclination angle of 90o (CB-S90I90) and two swirl port burners (SB) being SB-S90I13 and SB-S30I90 were compared. The temperatures obtained from CFD and experiments were similar which the error was less than 9%. From the CFD’s results the temperature and heat flux of the SB-S90I13 burner were higher than those of the CB-S90I90 burner. The maximum temperature and heat flux of SB-S90I13 burner were 1445 K and 5291 W/m2 respectively. It was implied that the combustion characteristic and heat transfer to the vessel of SB-S90I13 burner was better than that of CB-S90I90 burner. It was resulted that the thermal efficiency of SB-S90I13 burner was better than that of CB-S90I90 burner which was the percentage energy saving of 6.93%.

This study focuses on appropriate opening design of natural ventilation for green chemistry laboratories in Thailand. Even though natural ventilation is an alternative way to save energy from using air conditionings nowadays there is no design guideline to promote natural ventilation for chemistry laboratories in the country. Computational fluid dynamics (CFD) was used to simulate building models with various orientations and opening types. Then a set of simulations was run to test the effect of lay-out designs and opening locations in conjunction with the type of building models such as single-loaded corridor double-loaded corridor and atrium-loaded corridor by comparing ventilation performance with 8 wind directions at the speed of 2 meters per second. Results show that the single-loaded corridor lay-out design and opening arrangement which angled at 180 degree of wind direction and average wind speed of more than 0.5 meter per second was the most suitable comfort for improved natural ventilation in chemistry laboratories. Natural ventilation helps in reducing energy consumption improving quality of indoor environment and responding to the need of users based on standards and principles of green chemistry laboratory design.

This research aims to Test Melt Flow Index Spiral Test according to Standard ASTM : D 3123-94. To compare with this Standard the Melt Flow Index Spiral Test of HDPE PP and ABS which determined by the manufacturer was tested in various sizes. The test and the results were as follow: