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Hitachi

Corporate InformationEnvironmental Activities

Products & Services

Hitachi Group is developing and manufacturing environmentally conscious products in various fields. Some of these products are described below.

Wind Power Generation Systems

Wind power generation is a means of power generation that produces much less CO2 emissions than coal-fired power generation.

Hitachi has developed wind power generation systems that effectively capture wind on hilly terrain or out at sea, and currently operates 162 wind-turbines throughout Japan (as of the end of February 2017).

Installations of Wind Power Generation Systems in Japan

Hitachi also operates a training center to train maintenance and inspection engineers, thus contributing to the growth of the wind power generation and maintenance businesses.

What we do: Hitachi's Environmental Technologies

Downwind rotor

Wind turbines that use downwind rotors efficiently catch up-blow winds on the slopes of hills and mountains, increasing power generation efficiency.

The wind sensor installed ahead of the rotor allows for the accurate monitoring of conditions. Precise yaw control, in which the direction of the wind turbine is aligned according to the wind direction, increases power generation efficiency.

Compact nacelle

In 5.2MW turbines, the main shaft and its bearing are installed inside the hub to shorten the length of the nacelle, conserving resources.

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Rail Systems

Rail systems are becoming increasingly important as social infrastructure around the world because they have less environmental impact than other forms of transport and offer a mass transit solution.

As a comprehensive rail systems integrator, Hitachi provides railcar systems and transport systems such as signalling and train management systems globally to customers in Japan, Europe, the Americas, India and Asia.

What we do: Hitachi's Environmental Technologies

Aluminum rolling stock (A-train)

Lighter than stainless steel rolling stock, A-train rolling stock saves energy in operation and can run at high speeds. It is also easy to recycle, enabling effective use of resources.

Battery drive system

Battery-powered trains that can run on non-electrified sections of track by using energy stored in batteries that are charged from the alternating current (AC) overhead lines or an internal combustion engine save energy compared to conventional diesel rail cars and minimize noise.

Regenerative energy storage system

The regenerative energy storage system saves energy by storing reusable power generated when electric trains decrease their speed in storage batteries and using the stored energy during acceleration.
The stored power can also be used to propel trains in an emergency.

SiC Inverters

Made from SiC (silicon carbide), SiC inverters save energy by cutting power loss and reducing equipment size and weight by 40%, thus helping reduce the weight of rolling stock.

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Elevators, Escalators

With the progress of worldwide urbanization, population is concentrated in urban areas, and high and large buildings are increasing. Under such situations, it's an important issue to reduce the energy usage of elevators and escalators that are indispensable in an urban life.

Hitachi's elevators and escalators have energy-saving performance as a basic specification. In addition, we are globally promoting the supply of products and services considerate to human behavior based on our concept of HUMAN-FRIENDLY for Hitachi Elevators/Escalators, designating human as the starting point.

What we do: Hitachi's Environmental Technologies

Elevators

LED ceiling lighting

Energy-saving performance is increased and long-life ceiling lighting is achieved.

Energy-saving specification

Power consumption is reduced by about 5%*1 by increasing the efficiency of the electronic devices and the machine brake.

Regeneration system

Regenerative power generated according to the operating status of the elevator is effectively used for lighting and air conditioners in the building. The power consumption of the elevator is reduced by about 30% maximum. *2

Escalators

LED balustrade lighting and automatic light-off system

By applying LED lighting and the automatic light-off system when carrying no passengers to the balustrade lighting, power consumption is reduced by about 73%.*3

Eco-mode operation

The weight of passengers riding on the escalator is detected based on the inverter load information. Power usage is reduced about 821 kWh/year by decreasing the escalator’s speed when few passengers are being carried. *4

Automatic speed reduction system

The speed of the escalator is reduced when a sensor detects no passenger for a certain time. Power usage is reduced by about 1,970 kWh/year.*4

Automatic operating system

The speed of the escalator is reduced when a sensor detects no passenger for a certain time. Power usage of about 3,612 kWh/year is reduced. *4

*1
Compared with Hitachi’s standard elevator Urban Ace sold in 2012. The effect can be obtained in normal operation (according to a survey conducted by Hitachi Building Systems).
*2
The effect can be obtained in normal operation (according to a survey conducted by Hitachi Building Systems). The effect varies depending on the usage status in each case.
*3
Compared with the existing MX Series. The turn-off time is calculated to be six hours, which is the same period of time as the energy-saving, speed reduction operation when carrying no passengers.
*4
Compared with the existing MX Series. The S1000 model (not equipped with lighting) is used for effect calculation with a rise of 5 m based on 13-hour operation per day. The energy-saving operation time is set based on the actual performance of the VX Series in 2010.

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Water Environment Solutions

As demand for water increases with progressive urbanization, the social infrastructure relating to a safe, secure water supply is important in order to protect the basis of human life.

As a comprehensive water service provider, Hitachi delivers optimized and streamlined solutions for water supply businesses utilizing IoT*1, including water and sewage systems and seawater desalination plants.

*1
Internet of Things

What we do: Hitachi's Environmental Technologies

Energy-efficient seawater desalination plants

Utilize treated sewage as dilution water for desalination, lowering the salinity of the seawater, which in turn lowers the pump pressure required for the desalination process, achieving an energy saving of approximately 40%*2.

Energy-efficient sewage treatment control systems

Predict and control in real time the airflow of the ventilator to the biological reaction tanks that treat sewage, thereby reducing the airflow of the ventilator by approximately 38% and electric power consumption by approximately 27%.

Water distribution control systems

The use of appropriate discharge pressure to operate the water transmission and distribution pump, which accounts for 80-90% of electric power usage of water service providers in Japan, reduces electric power consumption by approximately 4%.

*2
Hitachi estimated value. Comparison with conventional seawater desalination systems on the assumption of the water production of 100,000 m³/day at seawater salinity of 3.5%.

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Amorphous Core Transformers

Transformers convert high-voltage electricity supplied from a power station into lower-voltage electricity for safe use. They operate every day of our lives and are used extensively.

Hitachi has reduced no-load losses (standby electricity) using a transformer that employs amorphous alloy. Energy savings have been achieved in public facilities and tall buildings where electricity usage fluctuates and in photovoltaic systems with a low actual operation rate, as well as in factories and buildings.

What we do: Hitachi's Environmental Technologies

Using amorphous alloy in iron core

No-load losses (standby electricity) have been reduced to about one-fifth by using amorphous alloy with superior electrical characteristics for the iron core where electricity-conducting windings are coiled.

Recycling amorphous alloy

A recycling system is established so that amorphous iron cores of used transformers collected from customers can be recycled to amorphous alloy and used as recycling material*1.

*1
Cooperation with a recycling company, distribution agent, and amorphous alloy manufacturer

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Storage Batteries

Although natural energy is effective for the reduction of CO2 emissions, there is an issue in that output fluctuates depending on the weather. Storage batteries compensate for the output fluctuations and play an important role in achieving a stable energy supply.

Further, storage batteries are used as a power source for vehicles and railroad vehicles and contribute to the promotion of fuel-efficient and low-carbon vehicles.

What we do: Hitachi's Environmental Technologies

Stationary VRLA*1 batteries for power storage “LL Series”

By using a technology that improves corrosion resistance, the number of charge-discharge cycles has been prolonged about 100 times*2 in the storage battery for a system that reduces output fluctuations of renewable energy, and resource savings have been achieved.

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Lithium-ion battery

By using a heat-resistant separator that secures ion conductivity between the positive electrode and the negative electrode of the battery, the output cell of 5,000 W/kg, equivalent to 1.5 times that of the existing product*3, has been developed with greater safety.
An in-car battery pack that improves vehicle energy efficiency and contributes to the low fuel consumption has been achieved.

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*1
VRLA:valve-regulated lead-acid.
*2
Compared with the existing product (product in 2005)
*3
Compared with the existing product (product in 2010)

Construction Machinery

Around the world, urban development and the construction of social infrastructure is picking up pace. Against this backdrop, demand for construction machinery is also on the rise. Improving the fuel consumption of construction machinery is expected to be an effective way of reducing CO2 emissions.

Hitachi meets global needs by providing hydraulic excavators and wheel loaders designed to reduce fuel consumption, as well as services using ICT*1 that improve productivity and ensure safety.

*1
Information and Communication Technology

What we do: Hitachi's Environmental Technologies

Hybrid hydraulic excavators

The hybrid excavators have a system that stores energy produced during swing deceleration as electric energy in the capacitor. By using this stored energy to operate the electric swing motor that assists the swing, the system improves fuel consumption by around 15%*2 compared with previous models.

Reduction of exhaust emissions

Hitachi's construction machinery such as the ZX350-6 is compliant with global non-road mobile machinery exhaust emission regulations, including requirements in Japan, Europe and North America. Features include an improved engine that reduces PM*3, as well as a system that sprays urea solution into exhaust gas to form ammonia, which then reacts with the NOx (nitrogen oxide) to break it down into nitrogen and water.

Reuse and recycling of used and failed parts

Hitachi operates the business of recycling construction machinery parts in 11 countries worldwide. We refurbish parts that were replaced during machinery repairs until they are as good as new and provide them as recycled parts with a quality warranty, thus promoting the effective use of resources.

*2
Comparison of ZH200-5B and previous model ZX200-5B
*3
Particulate Matter

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Refrigerators

With changes in lifestyle and a rising number of households, the energy consumption of the household sector is increasing more and more. Refrigerators are the appliances that use the most energy in our homes. The development of energy-saving refrigerators can be expected to effectively reduce energy consumption.

Hitachi develops high value-added refrigerators with proprietary features designed to suit conditions of use in and outside Japan and to meet customer needs, in addition to basic features such as energy-saving performance and low noise operation.

What we do: Hitachi's Environmental Technologies

Frost Recycling Cooling

The chilled air generated by frost on the evaporator is used to cool the refrigerator and vegetable compartments during the compressor is not in operation. The increased frost temperature shortens the amount of time required to defrost, and reduces power consumption.

HFC-free urethane Insulation/HFC-free Refrigerant

Hard urethane insulation made using HFC-free insulation foaming gas (cyclopentane) as a foaming agent is used for insulating parts that are not vacuum insulated. The HFC-free refrigerant (R600a), which has less effects on global warming compared to HFC-alternative is used.

Multi Valve Control

The refrigerator reduces energy consumption through efficient cooling, using proprietary technology to switch between two kinds of refrigerant paths-one designed for cooling power and another for energy saving-depending on the operating conditions.

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