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In gas cogeneration, city gas is used to power engines,
turbines and fuel cells to generate electricity, and the resulting
thermal energy used to produce steam and hot water. Gas cogeneration
systems are used for a variety of purposes, including production
process in factories, supplying hot water and steam in hotels and
hospitals, heating and air conditioning of buildings, and heated
swimming pools.
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Gas cogeneration systems reach total energy efficiency up to 70%
to 90%, and achieve high energy and cost saving performance. They
are also attracting attention as a clean, environmentally friendly
gas cogeneration systems since they are fueled by city gas which
is clean energy. Since gas engine cogenerations and fuel cell cogenerations
for residential use are expected to deploy, cogeneration systems
have become available for many purpose of gas users.
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･ Growth in gas cogeneration
(installed units) |
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Notes 1: Cogeneration by gas engine, gas turbine
and fuel cell (excluding steam turbine)
2: The total number of residential cogeneration systems in operation
was 522 (gas engines) in FY2002, 2,941 (gas engines) in FY2003,
10,157 (gas engines and fuel cells) in FY2004, 21,368
(gas engines and fuel cells) in FY2005, 38,195 (gas engines
and fuel cells) in FY2006, and 56,861 (gas engines and fuel
cells) in FY2007. |
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| ･ Effective use of energy by gas cogeneration |
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| ･ Total energy efficiency
of gas cogeneration systems: 70% to 90% |
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| Hospital |
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Restaurant |
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Office
buildings and hotels |
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Domed stadium |
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Small-sized
gas engine
cogeneration |
Micro gas
turbine cogeneration |
Gas engine
cogeneration system
for residential use |
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