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Energy-Derived CO₂
Reducing energy-derived CO2 emissions
Energy-derived CO2 emissions for Toshiba Group are increasing as its business expands. In the future, the Group plans to build new plants mainly in semiconductor and new rechargeable battery operations in order to meet a lively demand in the market, and energy- derived CO2 emissions are expected to grow in the immediate future. In order to reduce total energy-derived CO2 emissions as much as possible and improve the overall CO2 emissions per unit production, Toshiba Group is introducing energy-saving processes and equipment with the aim of reducing energy-derived CO2 emissions by 45% compared to the 1990 level by FY2010 and by 47% compared to the 1990 level by FY2012. As a result, in FY2010, the Group reduced energy-derived CO2 emissions by 48%, achieving the goals. We will continue to actively promote capital investments such as using high-efficiency chillers and air-conditioning systems as well as introducing high-efficiency lighting system. In FY2011, CO2 emissions are expected to increase as a result of the Great East Japan Earthquake; however, Toshiba Group will actively incorporate energy-saving measures into its activities.
Energy-derived CO2 emissions
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- The CO2 emission coefficient for electricity on the user is used to calculate energy-derived CO2 emissions (3.50 t-CO2/10,000 kWh in FY2010). Overseas electricity is based on GHG Protocol.
Breakdown of energy-derived CO2 emissions in FY2010
Case Study: Reduction in CO2 emissions by shifting energy use / CET Toshiba (Changzhou) Transformer Co., Ltd.
Changzhou Toshiba Transformer replaced coal-burning boilers with natural gas boilers in partnership with the Chinese city of Changzhou to improve air quality and promote a shift in industrial structure. By doing so, the company reduced annual CO2 emissions in 2010 by 7,114 tons (down approximately 65% compared to the previous year).
Toshiba Corp.'s Fuchu Complex has reduced CO2 emissions by 400 tons annually in its laboratory, which introduced a photovoltaic power generation system and the latest energy-saving equipment.
Building No. 11 (Laboratory) at Toshiba Corp.'s Fuchu Complex
Establishing a new photovoltaic power generation laboratory with the latest energy-saving equipment
The new laboratory at Toshiba Corp.'s Fuchu Complex, which was established with the latest energy-saving equipment in November 2010, is conducting experiments on next-generation electricity networks.
1. Introduction of a photovoltaic power generation system
The Fuchu Complex introduced a photovoltaic power generation system capable of generating 398 kW of electricity. By combining SCiB™ secondary batteries with this system to control fluctuations in system output more effectively, the Complex successfully reduced CO2 emissions by 124 tons annually.
2. Making heat source equipment more efficient
The multi air conditioning system reduces CO2 emissions by 37 tons annually by introducing high-efficiency air conditioning and realizing optimal operation using Neuro-PMV™ Control and Building Energy Management System (BEMS).
3. Introduction of LED lighting and lighting control systems
E-CORE™ LED lamps are used for the office area and outdoor lights. In addition, a system, which enables optimal lighting control by combining motion sensors, automatic dimmers, and other devices, is installed in the work area. These measures help reduce 112 t-CO2 annually.
4. Controlling CO2 emissions in the amount of ventilation
By using an inverter to control the amount of air taken in from the outside according to the concentration of CO2 in the room, reducing the energy used by heat sources, and cutting back on the power used to convey outside air, the Complex reduced CO2 emissions by 155 tons annually.
Case Study in FY2008
Case Study: Energy conservation at a semiconductor factory / Oita Operations, Toshiba Corp.
High-efficiency inverter refrigerator
Clean rooms at semiconductor factories consume a large amount of energy for air-conditioning throughout the year. The Oita Operations substantially improved the overall efficiency of air-conditioning mainly by increasing the efficiency of refrigeration equipment and supplementary machine systems and establishing energy-saving automatic control systems. Through these measures, the factory reduced annual CO2 emissions by 12,291 tons.
Case Studies in FY2007
Case Study 1: Energy Saving by Reduction of the Clean Room Air Circulation Flow / Oita Operations, Toshiba Corp.
Clean rooms at semiconductor factories consume a large amount of energy for air-conditioning throughout the year. The Oita Operations substantially improved the overall efficiency of air-conditioning mainly by increasing the efficiency of refrigeration equipment and supplementary machine systems and establishing energy-saving automatic control systems. Through these measures, the factory reduced annual CO2 emissions by 12,291 tons.
Case Study 2: Energy Conservation at the TV Production Base in China / Toshiba Dalian Television Corporation
At Toshiba Dalian Television Corporation, which is Toshiba's TV production base in China, CO2 emissions decreased by 88% owing to the air conditioning of the newly introduced production line, via an intake of cold open air into the intra-room air conditioning for the heat application line during wintertime.
Case Study 3: Energy-saving Semiconductor Manufacturing Plant / Oita Operations, Toshiba Corporation
At Toshiba Dalian Television Corporation, which is Toshiba's TV production base in China, CO2 emissions decreased by 88% owing to the air conditioning of the newly introduced production line, via an intake of cold open air into the intra-room air conditioning for the heat application line during wintertime.
(l to r) Hiroyuki Goto, Koji Gohyakuji, Yujiro Sakai, and Shinji Goto Facilities Management Group, Facilities Management Department, Oita Operations, Toshiba Corporation
Clean Room
Improvement Measures and Effect
| Improvement measure | energy saved (t-CO2 ) | Effect (million yen) |
|---|---|---|
| Reduction of steam consumption owing to the change of the humidifying method | 1,545 | 36.3 |
| Energy saving of pure water equipment (greater recovery of waste heat from the refrigerator) | 447 | 9.8 |
| Energy saving of pure water equipment (recovery of waste heat from the manufacturing equipment) | 326 | 6.7 |
| Total | 2,348 | 52.8 |
Case Study 4: Energy Saving by the Introduction of Dryers with No Purge Loss
AFPD Pte., Ltd., a Singapore-based subsidiary manufacturing low-temperature polysilicon TFT LCD cells, introduced dryers with no purge loss in fiscal 2006. As a result, the company reduced the amount of energy used to produce high-pressure dry air used in the manufacturing process.
Previously, adsorption-type heatless dryers were used for production of high-pressure dry air. However, 16% of the high-pressure dry air produced was used for treating the adsorbent. Thanks to the introduction of dryers with no purge loss that use reduced pressure for treating the adsorbent, high-pressure dry air is no longer used for that purpose. Measures implemented to enhance the overall efficiency of the high-pressure dry air production system have led to a 19% reduction in energy consumption. This translates into a 1,460t-CO2 reduction in CO2 emissions a year.
Mitigation of Climate Change
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