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.)
*Gas engine-based CHP systems generate electricity and recover waste heat generated as a by-product.
Saving Energy and Curbing CO2 Emissions through Residential Power GenerationEnergy 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)
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 Screen on CO2 Emission Reduction
App Screen Showing Electricity, Gas and Hot Water Usage
Enepa app’s message window
The ENE-FARM residential fuel cell CHP system
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