The effect of installation of next-generation home energy systems in Japan (6-290-11)
Takahiro Tsurusaki, Jyukankyo Research Institute, Inc., JapanChiharu Murakoshi, Jyukankyo Research Institute, Japan
Haruki Tsuchiya, Research Institute for Systems Technology, Japan
Toshihide Tanaka, Osaka Gas Company, Japan
Kanya Ishii, Osaka Gas Company
Takehiko Nishio, Osaka Gas Company, Japan
Hidetoshi Nakagami, Jyukankyo Research Institute, Japan
This is a peer-reviewed paper.
Keywords
zero-carbon houses, simulation, combined heat and power (CHP), photovoltaics, fuel cellAbstract
The concept of Zero Energy House has been getting attention in recent years for mitigating carbon dioxide (CO2) in a residential sector. The Japanese government has set a goal that net zero energy houses will become general in the new housing market by 2020. Net zero energy houses will require not only highly insulation and high-efficient equipments but some kind of home energy systems, such as a combined heat and power (CHP) system and a photovoltaic generation (PV) system.
Since 2009 the government has strengthened support for PV system. For residential PV systems both a subsidy program for new installation and a feed-in-tariff (FIT) program were launched. In the FIT program PV system owners including existing installation can sell their surplus electricity at a flat rate of 48 yen (about 42 euro cents) per kilo-Watt hour in a decade. These changes succeeded in expanding the domestic PV system market so far.
A market of residential CHP system in Japan has been gradually developed since a gas engine CHP system was commercialized in 2003. In 2009 a proton-exchange membrane fuel cell (PEFC) CHP system which has higher power generating efficiency was launched onto the market. In present solid-oxide fuel cell (SOFC) CHP system is under product development. In the housing sector installing both PV system and CHP system is not unusual.
In this paper a simulation model of a home energy system with a SOFC CHP system and a PV system and a battery was developed. The effects of each system and combined system were evaluated in terms of energy bill, primary energy use and reduction of CO2. The result showed a 700 Watt SOFC CHP system and a 3.5 kilo-Watt PV system can reduce by half primary energy use in a 4-person household in Osaka area. The combination was superior to a combination of a typical heat pump hot water heater and the same PV system. The condition to achieve net zero energy consumption was also discussed.
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Panels of the eceee 2011 Summer Study:
Panel 1. Policies and programmes to drive transformation
Panel 2. Current energy efficiency policies: On stage and backstage
Panel 3. Energy use in industry: The road from policy to action
Panel 4. Transport and mobility: How to deliver energy efficiency
Panel 5. Saving energy in buildings: The time to act is now
Panel 6. Innovations in buildings and appliances
Panel 7. Monitoring and evaluation
Panel 8. Dynamics of consumption
