Senior Vice President, Group President,
Public Utility Systems
The Public Utility Systems Group manufactures a host of products, systems and services used in social infrastructure to support people’s lives. We contribute to sustainable progress in society by developing and supplying products that save energy, as well as help prevent/reduce damages of disasters and treat drinking water and sewage.
In terms of efficient use of energy, we are the first company in the world to successfully produce inverters equipped with all-SiC power modules* for use in rolling stock. The power modules are helping to increase energy savings in railway operations, both in Japan and overseas. Additionally, we contribute to advancements in energy-efficient societies by manufacturing equipment and systems that promote the use of photovoltaic power generation systems and the construction of ZEBs.
Mitsubishi Electric develops and manufactures products and systems that help to prevent and mitigate natural disasters, which have been on the increase around the world in recent years. For example, by providing meteorological radar technologies and river information systems, we help municipalities supply their residents with information regarding localized heavy rainfall and flooding. Should a disaster occur, our Helicopter Direct Satellite Communication system ensures that information about the affected areas is collected, thus supporting the formulation of precise disaster measures.
Under current global circumstances, in which water shortage is an imminent problem in various regions, we are helping to purify water—a limited resource—by providing electrical products, ozone generators and other systems for use in water treatment plants.
During the production of our products, we continue to look for ways to further increase energy conservation in all processes of design, manufacturing and testing, as well as reduce the use of chemical substances.
Going forward, we will contribute to the realization of a sustainable, safe, secure, comfortable and affluent society by making full use of the wide-ranging technologies that we have developed over the years and continuing our ongoing technological development.
Focusing on the SDGs
Inverter for rolling stock
We produced an inverter equipped with all-SiC power modules for use in rolling stock and launched it at the end of fiscal 2015. It enables energy savings of approximately 40% compared to conventional vehicles. This product is now being used by many customers.
Railcar air-conditioner unit
In addition to introducing smaller-diameter piping and achieving a 20% reduction in heat exchanger size, we have readjusted materials to reduce the weight by 6%, thereby enabling the production of a more compact, lighter air-conditioning system. Additionally, our aim is to reduce environmental impact by promoting the use of an alternate refrigerant with low GWP* as a replacement for greenhouse gases.
Station Energy-Saving Inverter (S-EIV)
We have produced and introduced to the market a station auxiliary power system that is capable of supplying the regenerative electricity generated when rolling stock is braking directly to a station's electrical facilities (lights, air conditioners, elevators, etc.). Each station where the system is installed saves approximately 600 kWh per day (equivalent to the electricity used by 60 households). This is contributing to energy savings at station buildings. Furthermore, in 2016, the Agency for Natural Resources and Energy Commissioner’s Prize of the New Energy Awards was presented for a hybrid version that is smaller than conventional models and combines a storage battery with the power system.
By increasing the efficiency of the power and drive circuits for the LED drive, optimizing the drive voltage, and introducing a high-efficiency LED, we have reduced power consumption per unit of area by 3%. In addition, by reviewing the housing structure, we have reduced the screen weight by 40%.
In times of large-scale disasters, such as earthquakes and fires, Helicopter Direct Satellite Communication System transmits real-time aerial imagery of the affected areas from a helicopter to the authorities in charge of disaster response. By providing the people in charge of initial response, including emergency services, with accurate information on the affected areas, this system contributes to appropriate and prompt actions onsite.
Ozone generators are used in advanced water treatment processes and paper pulp bleaching because of their superior oxidation and ability to eliminate bacteria, odors, and colors. By developing a technology that places electrodes closer together in the generator's oxygen source and also applying it to the air source, we have achieved a more compact and more efficient design. As a result, overall system power consumption has been reduced 15%.
We have developed a membrane bioreactor(Eco MBR™) as water treatment technology which uses ozonized water to clean the membrane filters for treating and recycling municipal and industrial wastewater. The Eco MBR™ system is compact and energy-efficient, and is capable of high-speed filtration, which enables the device to treat twice as much water per membrane filter surface area compared to conventional methods.
In addition to contributing to society through our business operations, we are striving to reduce the negative environmental impact stemming from our business activities. Some of the initiatives we are implementing are as follows.
Initiatives to reduce environmental impact such as through activities to improve facilities, testing and distribution, and the enforcement of thorough waste separation, continue on a daily basis at the Kobe Works, Itami Works, and Nagasaki Works, which function as our product supply bases.
New lines built at the Kobe Works and Itami Works use LED lighting, higher-efficiency air conditioners, and solar power generation systems to achieve greater power savings. We are also making improvements that contribute to increasing facility efficiency, such as utilizing the exhaust from thermal-catalyst boilers (the heat source for drying ovens) to heat water to wash products.
In the testing of large electric power devices such as VVVF* equipment for rolling stock, we are implementing initiatives to effectively utilize energy, including the use of electricity generated by power generators connected as artifical loads, thus achieving zero waste.
We are promoting the reduction of CO2 and waste emissions by expanding the use of returnable packaging and making a modal shift in transportation, from using trucks and planes to using railways and ships.