Abstract:
This research is to study the energy consumption of an electronic element factory with the equivalent unit technique which is applied to analyze the energy consumption and process of electronic elements. This study consists of 5 steps including of step 1: collect and study data of the production and energy consumption of this electronic element factory, step 2: evaluate the energy consumption of this electronic element factory, step 3: cluster all electronic-element products into groups, step 4: analyze and select main groups of electronic-element products and step 5: develop plans to reduce the energy consumption. According to the 5 analysis steps, it shows that 1) all 36 electronic-element products are classified into 3 main groups: The first group has characters of low specific energy consumption (SEC) and high value of the equivalent unit, The second group has characters of high SEC and medium value of the equivalent unit and the third group has not clearly characters (Its SEC and equivalent unit vary from low to high level) and 2) DI12 product (diode) is selected from the third group with the high SEC and low equivalent unit product and it is going to be analyzed develop plans to reduce the energy consumption. After that, the main cause of high SEC of DI12 product is foreign particles stuck on the lead of workpiece during its production process that makes Mean Time Between Failures (MTBF) being 6.44 minutes. To remove these foreign particles, the foreign-particle removing devices are developed and they can increase MTBF to be 12.49 minutes. That means lead time of DI12 is reduced to 1,9 45 mins/ lot and the SEC of Dl12 is reduced from 1 0,004 kilowatt-hour/ lot to 8,6 9 5 kilowatt-hour/ lot. Hence the cost of electric energy is saved up to 392,535 bahts/ year.