Tokyogasgroup csr report

Contribution to the Environment

Advancing and Expanding Natural Gas Use with Highly Efficient Residential Gas Appliances and Systems

Tokyo Gas develops and promotes kitchen stoves fitted with highly efficient burners, highly efficient water heaters that recover latent heat, and residential power generation systems that utilize exhaust heat.

DFF Inc., Corporate Social Responsibility Sect, General Administration Dept., Corporate Planning Dept., Resources & Global Business Division, Energy Solution Div, Power Buisiness Dept., Pipeline Network Division, IT Division, Residential Sales Div., Fundamental Technology Dept., Energy Solution Div, Environmental Affairs Dept., Purchasing Dept. , Health Insurance & Employees' Welfare Sect., Personnel Dept., Internal Audit Dept., Audit & Supervisory Board Member's Office, Compliance Dept., Regional Development Div., Finance Dept, TGES, TOKYO GAS COMMUNICATIONS, INC.

Popularization of Highly Efficient Eco-JOES Water Heaters

While standard conventional residential gas water heaters have a maximum heating efficiency of 83%*1, the Eco-JOES highly efficient, home-use water heaters are equipped with an exhaust heat and latent heat recovery system that boosts this figure to 95%*2. Assisted by the industry-wide “Eco-JOES Adoption Campaign” to promote the introduction of Eco-JOES, the number of residential installations is rising every year. As of the end of March 2017, shipments reached about 7.24 million units for the industry as a whole. Due to their efficient use of heat, the Eco-JOES water heaters reduce releases of CO2 into the air and help reduce CO2 emissions and combat global warming. Their remote controls incorporate the EneLook*3 function, which displays gas and hot water usage, a visualization feature that helps users save water and energy.
*1 For RUF-A2405AW(A), a conventional water heater.
*2 For RUF-E2405AW(A), an Eco-JOES model.
*3 Some remote controls do not support EneLook.

Note: Calculations for both *1 and *2 were made using the JIS S 2109-stipulated methods. (However, heating efficiencies depend on the conditions of use.)

 
How the Eco-JOES Highly Efficient Water Heaters WorkHow the Eco-JOES Highly Efficient Water Heaters Work
DFF Inc., Corporate Social Responsibility Sect, General Administration Dept., Corporate Planning Dept., Resources & Global Business Division, Energy Solution Div, Power Buisiness Dept., Pipeline Network Division, IT Division, Residential Sales Div., Fundamental Technology Dept., Energy Solution Div, Environmental Affairs Dept., Purchasing Dept. , Health Insurance & Employees' Welfare Sect., Personnel Dept., Internal Audit Dept., Audit & Supervisory Board Member's Office, Compliance Dept., Regional Development Div., Finance Dept, TGES, TOKYO GAS COMMUNICATIONS, INC.

Residential CHP Systems

Residential power generation employs combined heat and power (CHP) systems* that had been primarily used at large plants and buildings. This energy-saving system extracts two types of energy from one energy source, generating electricity and heat for effective use. The system also generates a sense of delight through the value of generating power at home. At the same time, it helps reduce energy consumption and CO2 emissions. We offer the fuel cell ENE-FARM systems for residential power generation.

*Gas engine-based CHP systems generate electricity and recover waste heat generated as a by-product.

 

Saving Energy and Curbing COEmissions through Residential Power Generation

Energy that can be directly collected in nature is primary energy, while energy such as electricity, generated through the use of primary energy, is secondary energy. Properly assessing energy conservation and measures to fight global warming requires taking into account changes in primary as well as secondary energy. Since residential power generation takes place where electricity is also consumed, exhaust heat can be used for such purposes as heating water, which is not possible at thermal power stations.


Residential Power Generation (the ENE-FARM System)

Residential Power Generation (the ENE-FARM System)
Note: Backup heat source equipment is used to generate hot water used for space heating.

 

ENE-FARM Residential Fuel Cell CHP System

In May 2009, we introduced the world’s first fuel cell combined CHP system for detached housings, called the ENE-FARM, and co-developed the product with Matsushita Electric Industrial Co., Ltd. (now Panasonic Corporation). Tokyo Gas’ estimate for a standard case shows that the ENE-FARM CHP system reduces annual CO2 emissions by about 1.3 tons, compared to conventional systems, and is touted as the key to mitigating climate change using a residential system.
The remote control panel in a kitchen or a bathroom features easy-to-understand displays of the amounts of power generated and used. It also shows, on a daily basis, how much the system has helped the environment in terms of familiar things in order to foster environmental awareness among family members. A network access service started in August 2017 allows users not only to see how much energy is consumed at home but also to obtain information on ways to use energy efficiently, using a dedicated smartphone application.
 

Remote Control Panel Showing the State of Solar Photovoltaic Power Generation

Remote Control Panel Showing the State of Solar Photovoltaic Power Generation

Remote Control Screen on CO2 Emission Reduction

Remote Control Screen on CO2 Emission Reduction

App Screen Showing Electricity, Gas and Hot Water Usage

App Screen Showing Electricity, Gas and Hot Water Usage

Enepa app’s message window

Enepa app’s message window

The ENE-FARM residential fuel cell CHP system(for detached houses, manufactured by Panasonic Corporation)

The ENE-FARM residential fuel cell CHP system
(for detached houses, manufactured by Panasonic Corporation)

Assumptions for Estimates of CO Emissions (g-CO2)
(1)
CO2 emission factor: 0.65 kg-CO2/kWh for electricity (average factor for thermal power in FY2013 according to the government’s Plan for Global Warming Countermeasures (May 2016)), 2.29 kg-CO2/m3 for gas (Tokyo Gas data)
(2)
Annual load: 16.6 GJ for hot water, 1.3 GJ for bath reheating, 2.2 GJ for cooking, 6.4 GJ for AC (cooling), 12.7 GJ for floor heating, 5.5 GJ for AC (heating), 12.5 GJ for lighting, etc. (for a four-person family living in a detached dwelling with a total floor area of 120 m2)
(3)
Electricity demand for a dwelling supplied with both gas and electricity (using conventional systems): 4,223 kWh (including power consumed by gas water/space heater)
(4)
Equipment used: Conventional system gas water/space heater, gas hydronic floor heating (living room), gas stove, electric AC used for cooling and heating in other rooms
ENE-FARM, gas hydronic floor heating (living room), gas stove, electric AC used for cooling and heating in other rooms
*Figures may not sum due to rounding.
 

Active Utilization of Solar Energy

For household use, Tokyo Gas proposes dual power generation, which combines solar photovoltaic power generation and the ENE-FARM, and the SOLAMO, which combines solar heating with the Eco-Joes highly efficient water heater. Each combination significantly reduces a household’s environmental impact and includes the kind of backup system required to actively utilize solar energy, which necessitates an unstable output of secondary energy.


Dual Power Generation by Solar Power and the ENE-FARM

Dual Power Generation by Solar Power and the ENE-FARM
Note: The solar photovoltaic power generation system is not a product of Tokyo Gas.

Water Heating System Using Solar Heat
Water Heating System Using Solar Heat
 
DFF Inc., Corporate Social Responsibility Sect, General Administration Dept., Corporate Planning Dept., Resources & Global Business Division, Energy Solution Div, Power Buisiness Dept., Pipeline Network Division, IT Division, Residential Sales Div., Fundamental Technology Dept., Energy Solution Div, Environmental Affairs Dept., Purchasing Dept. , Health Insurance & Employees' Welfare Sect., Personnel Dept., Internal Audit Dept., Audit & Supervisory Board Member's Office, Compliance Dept., Regional Development Div., Finance Dept, TGES, TOKYO GAS COMMUNICATIONS, INC.