Design of local exhaust ventilation for soldering at Bangkok Vocational Training Center, Bangkok Noi District

Abstract

The objectives of this research were 1) to develop local ventilation equipment for use during soldering of electronic devices. 2) To test the effectiveness of local exhaust ventilation in reducing the amount of pollutants during soldering of electronic devices of learners and instructors at Bangkok Vocational Training Center, Bangkok Noi District. The statistics obtained are average, percentage. Has designed a dedicated ventilation system for soldering electronic parts a total of 2 times.  After building, has been tested for efficiency of the local exhaust ventilation compared to the calculated design list. At the 1st time, there was a problem of sparking at the fan and making noise while in use. Therefore, the second local exhaust ventilation was developed, and the efficiency has been tested. It was found that the air velocity and the static pressure values are different from the values calculated before the design. When testing the pollution reduction effectiveness of local exhaust ventilation Before and after activation of personal local exhaust ventilation during soldering of electronic devices, it was found that carbon monoxide decreased by 100 percent, lead fumes decreased by 83.96 percent, and carbon dioxide decreased by 65.72%. The results of testing the effectiveness of ventilation equipment only in terms of sound pressure level found that the fan had an effect on the sound pressure level. After improvement, the sound pressure level, Leq 5 min was 55.70 dB(A) on average.