APPLICATION OF THERMAL DISSIPATION METHODS TO ANALYZE FILAMENT CHARACTER AND LIGHTING EFECTIVENESS OF INCANDESENT LAMPS

• Main Author: SIGIT PURWONO (NIM. 90211001), BUDI
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/19973
• Institution: Institut Teknologi Bandung

Incandescent lamps (bulbs) as an artificial lighting purpose are not only generated visible light energy as the result. Electrical energy that absorbed is being used to heat up the filament to produce light. This research will examined the gain of resistance value from <br /> <br /> <br /> the filament of incandescent lamps, so does the electric power of lamp will be changes. By this methods, we can calculate the gain of filament temperature when the lamps is operated. Also examined the proportion of heat energy (thermal) of the lamps toward total number of electric energy that absorbed by the lamps. Amount thermal energy from the lamp will dissipated, so the total of light energy is left over. And so on, we also can analyze the effect of filament shape to the lighting effectiveness of the lamp. As the results, 1). The resistance of filament will increase by several times when the lamp was operated in 220 Volt (PLN). The average gain of resistance value on each group of power lamps are: on 15 Watt of lamps are about 9,22 times, on 25 Watt lamps are 11.21 times, and about 13,05 times on 40 Watt of lamps. These results showing an indicate that <br /> <br /> <br /> the greater the electrical current in the filament, the greater gain in resistance value. 2). The average gain of filament's temperatur on 15 Watt is 1.826,45 °C; on 25 Watt is 2.550,79 °C; and then on 40 Watt is 2.550,79 °C. 3) The average proportion of heat energy (%Q) that produced from incandescent lamps in each group of power lamps are: on the 15 Watt are about (96.52 ± 1.24)%, on 25 Watt are (95.20 ± 2.55)%, and group of 40 Watt are about (94.93 ± 1.78)%. The smaller the proportion of heat energy is released, the higher efficiency of incandescent bulbs. These results also show a pattern, the greater the electrical current flows in the filament, the temperature will be higher, and then the <br /> <br /> <br /> higher proportion of visible light energy is produced. This research also exploring the effect of the shape of filament toward lamp's resistivity and lighting effectiveness of incandescent lamps.