| Summary: | 碩士 === 國立交通大學 === 工學院永續環境科技學程 === 102 === Due to continuing concern over global warming and climate change issues, greenhouse gas (GHG) reduction now becomes the common goal in countries around the world. Although semiconductor test industry is not obliged to report GHG emissions, the industry still actively involves in volutary energy saving and carbon reduction to protect the earth envrionmennt and climate in response to the demand of green supply chain and corporate social responsibility.
Energy consumption is closely related to anthropogenic GHG, i.e. CO2, emissions. The semiconductor testing house of this study is power-consuming and faces the pressure to cut the cost. Therefore, there is a demand to improve energy efficiency in this plant. This study uses quality control circle (QCC) concept and targets at low cost, fast output and team effort to optimize the performace of relavant facilities. The purpose is to improve the efficiency of the air-conditioning system to achieve the energy-saving goal.
The carbon reduction and power saving priorities were first set by the survey of the GHG emission inventory. Three factories: A, B, and C of the semiconductor testing plant were investigated for the GHG emissions from 2011 to 2012. Results show that indirect energy emissions contribute 97.47 % of total emissions and the main source is purchased electricity. The estimated total GHG emission is 47,572.90 tons CO2e/year in 2012, which is 4146.18 tons CO2e/year less than that in 2011 or 8.02 % reduction in total emissions.
The plant used the power-saving control module for the chiller system for the first time in 2012 to reduce the inlet water temperature of the cooling tower and to increase the outlet water temperature of the chiller. As a result, 109.43 and 454.71 tons of GHG emissions were reduced, respectively. This emission reduction is equivalent to 1.5 times carbon dioxide sink of the Daan Park in Taipei achieving 1.19 % of total GHG emissions in 2012. Therefore, the goal of energy saving and cost cutting can be achieve by proper adjustment of the operational conditions of the air-conditioning system. It is a practical energy saving and carbon reduction method at the current stage.
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