Development of 1 kW Residential Gas Engine Cogeneration System

1
Development of 1 kW Residential Gas Engine
Cogeneration System
Osaka Gas Co ., Ltd.
2
Product Features

• 1kW capacity worlds smallest gas engine
  cogeneration system
• (2) High efficiency overall efficiency of 85
• (3) 80?C exhaust heat temp. wide-ranging
  applications of hot water
• (4) Low NOx emission
• (5) automatic operation adjustment by learning
  function

3
Progress of Development
1996
1997
1998
1999
2000
2001
2002
12kW Starting of Development
Feasibility study Specification Proto-type study
1kW residential use efficiency
up 10year-durability
Gas engine Pre-commercial version
Gas engine exhaust heat system commercial
version
In-house Field test
Commercialization
Exhaust heat recovery system proto-type
Exhaust heat recovery system
Pre-commercial version
16 Field test
100 Field monitor
4
Conceptual System Drawing
Grid
Electricity
Hot water supply and central heating system
utilizing exhaust heat
Bathroom heater/drier
Air conditioner
Lighting
Hot water storage tank
Gasengine
Shower
T V
Natural gas
Bath
Hot water supply
Floor heating
5
Demands of a Standard Japanese Household
Electric Power Demand
Hot Water Demand
kWh
kWh
4 3 2 1 0
4 3 2 1 0
Winter
Winter
Summer
Summer
Other
Other
2 4 6 8 10 12 14 16 18 20 22 24
2 4 6 8 10 12 14 16 18 20 22 24
Time of Day
Time of Day
Annual Demand 5,400 kWh
Annual Demand 6,060 kWh
Source Institute of Research Innovation
Survey, 1998
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Gas Engine Specifications
Generator
Engine
Oil Tank
Durability
20,000 hours or 10 years
Frequency of periodic
6,000hours
inspections
(Approx. 3 years)
Gas Engine Package
7
Utilization of Engine Exhaust Heat
Minimum Heat Loss Design
Temperature-stratefied Hot Water Storage
Hot water supply
Backup Boiler
Hot water storage tank 150 L
(60?C)
Heat exchange
Direct use of Exhaust Heat for Heating
Gas engine
Heat radiation
(42?C)
Re-heating of Bath
Heat exchange
(60?C/80?C)
Heating (floor heating/bathroom drying)
Heat exchange
No heat shortage with backup boiler
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System Comparison
Running cost
CO2 emission
Energy savings (primary energy consumption)
Gas sales volume
100
100
100
100
Conventional gas hot water supply/floor heating
system power from grid
127
87
70
80
Gas engine cogeneration system (max.)
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Points to Increase Energy Saving
Exhaust heat adoption for Heating
Increase of Operation hours
Hardware
Small storage tank
Storage with temperature layer
Decrease of Heat Loss

Self Learning Control
Software
Increase of Power load factor
Energy saving Navigation
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Self Learning Function
Determination of operation timing
Measurement of loads
Forecast of required loads
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Self Learning Function
An example of daily pattern for power demand and
generation
generated power
power demand
Evening hours when family gather
Getting dressed in the morning
ECOWILL under operation
ECOWILL under operation
Majority of thermal loads and 30 to 40 of power
loads are supplied by ECOWILL
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Pricing Strategy
Basic Idea
To set the price to recover the price difference
with the conventional system in 5 years
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Pricing Strategy
Initial Cost
\400,000 (3,200)
government subsidy \200,000 (EURO1,600)
fixed price \750,000 (EURO 6,000)
fixed price \350,000 (EURO 2,800)
\200,000 (1,600)
(1EURO\125)
conventional system (water heater)
ECOWILL
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Pricing Strategy
Running Cost

• promotional gas rate
• lowest gas rate applied among residential tariff
  table
• maintenance contract recommended
• periodical inspection combined with repair
  services at
• \5,000 (EURO40) / year

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Economic Comparison
annual cost advantage \ 40,000 (EURO320) / year
significant reduction in elec. bill
maintenance fee
elec. bill
elec. bill
efficient utilization of exhaust heat
gas bill
gas bill
application of special gas rates
conventional system
ECOWILL
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Target Market and Sales Plan
Target Customers
newly-built detached houses 50,000/year (in OG
service area) of which -
with gas floor heating 45
floor space gt120m2 53
target customers 12,000/year
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ECOWILL is
Ultimatedistributed energy system
-Co-generation is the most effective means of
reducing primary energy -Creating New
Culture for Residential Sector using gas
infrastructure
We believe ECOWILL is -the best choice for
customers in terms of energy saving and cost
performance -the most powerful strategic weapon
for gas companies all over the world