654
Y. Mizuno et al.
Table 43.4 Parameters t o
calculate cost
Item
Value
Source
Unit cost of
electrolyzer
50,000 JPY/kW
Council and on
Renewable Energy
(2017)
Unit cost of
hydrogen tank
4,200 JPY/Nm 3
Chubu Gas Corp
(2005)
Operating
period
15 years
Discount rate
3%
Maintenance
cost rate
5%/year (to facility
cost)
Cost of
electricity
10.0 JPY/kWh (Case
A)
2.5 JPY/kWh (Case
B)
5.0 JPY/kWh (Case
C, D)
Cost of water
45 JPY/t
Aomori Prefecture
(2016)
Pipeline cost
300,000,000 JPY
(total 3.0 km length)
43.4.7 Step 7. Economic Feasibility
Hydrogen generates 2.94 kWh/Nm
3 (Lower Heating Value basis) of energy when
combined with oxygen. We can utilize part of it as electricity and heat as hot water. In
this study, equivalent value of hydrogen to grid electricity and fuel oil is the boundary
of economic feasibility. For example, as shown in Table 43.5, 1 Nm
3 of hydrogen is
equivalent to 1.44 kWh of grid electricity and 1.35 kWh of heat from fuel oil, which
is used in 0.7 kW fuel cell. When grid electricity is 10 JPY/kWh and heat from fuel
oil is 3 JPY/kWh, hydrogen used in 0.7 kW fuel cell has equivalent value of 10*1.44
+ 3*1.35 = 18.45 JPY/Nm
3 .
The grid electricity and fuel oil prices in this study are shown in Table 43.6. The
cost in 2016 is got from a website (Tohoku Electric Power Co and Inc. 2019), the
average of real electricity bills of public facilities, and statistics (Agency of Natural
Table 43.5 Spec of fuel cell and value of hydrogen
0.7 kW fuel cell
100 kW fuel cell
Efficiency (electricity)
49%
50%
Efficiency (heat)
46%
46%
Electricity equivalence of hydrogen (kWh/Nm 3 )
1.44
1.47
Heat equivalence of hydrogen (kWh/Nm 3 )
1.35
1.35
Y. Mizuno et al.
Table 43.4 Parameters t o
calculate cost
Item
Value
Source
Unit cost of
electrolyzer
50,000 JPY/kW
Council and on
Renewable Energy
(2017)
Unit cost of
hydrogen tank
4,200 JPY/Nm 3
Chubu Gas Corp
(2005)
Operating
period
15 years
Discount rate
3%
Maintenance
cost rate
5%/year (to facility
cost)
Cost of
electricity
10.0 JPY/kWh (Case
A)
2.5 JPY/kWh (Case
B)
5.0 JPY/kWh (Case
C, D)
Cost of water
45 JPY/t
Aomori Prefecture
(2016)
Pipeline cost
300,000,000 JPY
(total 3.0 km length)
43.4.7 Step 7. Economic Feasibility
Hydrogen generates 2.94 kWh/Nm
3 (Lower Heating Value basis) of energy when
combined with oxygen. We can utilize part of it as electricity and heat as hot water. In
this study, equivalent value of hydrogen to grid electricity and fuel oil is the boundary
of economic feasibility. For example, as shown in Table 43.5, 1 Nm
3 of hydrogen is
equivalent to 1.44 kWh of grid electricity and 1.35 kWh of heat from fuel oil, which
is used in 0.7 kW fuel cell. When grid electricity is 10 JPY/kWh and heat from fuel
oil is 3 JPY/kWh, hydrogen used in 0.7 kW fuel cell has equivalent value of 10*1.44
+ 3*1.35 = 18.45 JPY/Nm
3 .
The grid electricity and fuel oil prices in this study are shown in Table 43.6. The
cost in 2016 is got from a website (Tohoku Electric Power Co and Inc. 2019), the
average of real electricity bills of public facilities, and statistics (Agency of Natural
Table 43.5 Spec of fuel cell and value of hydrogen
0.7 kW fuel cell
100 kW fuel cell
Efficiency (electricity)
49%
50%
Efficiency (heat)
46%
46%
Electricity equivalence of hydrogen (kWh/Nm 3 )
1.44
1.47
Heat equivalence of hydrogen (kWh/Nm 3 )
1.35
1.35