Blog
Hydrogen Hydrogen Methanol Methanol ammonia ammonia Criteria Sub-criteria Alternative fuels [a] fuel
Hydrogen
Hydrogen
Methanol
Methanol
ammonia
ammonia
Criteria
Sub-criteria
Alternative fuels
[a] fuel price is based on three factors: production, Transportation and storage. For a distance of 200 km. (Wartsila,2023)
[b] (Wartsila,2023)
[c] (Wartsila,2023)
[d] (Hansson, J., Månsson, S., Brynolf, S. and Grahn, M., 2019)
[e] Ammonia (NH3) (liquid, -33°C), Methanol (CH3OH) (65°C), Hydrogen (H2) (liquid, -253°C). (MAN Energy Solutions,2020)
[f] based on raw material availability, current fuel production and current fuel usage. (Hansson, J., Månsson, S., Brynolf, S. and Grahn, M., 2019)
[g] ammonia Nox is expected to be similar to the conventional low speed diesel engine (MAN Energy Solutions,2020)
[h] based on Toxicity, Flammability and Storage and Handling
[i] (Hansson, J., Månsson, S., Brynolf, S. and Grahn, M., 2019)
[a] fuel price is based on three factors: production, Transportation and storage. For a distance of 200 km. (Wartsila,2023)
[b] (Wartsila,2023)
[c] (Wartsila,2023)
[d] (Hansson, J., Månsson, S., Brynolf, S. and Grahn, M., 2019)
[e] Ammonia (NH3) (liquid, -33°C), Methanol (CH3OH) (65°C), Hydrogen (H2) (liquid, -253°C). (MAN Energy Solutions,2020)
[f] based on raw material availability, current fuel production and current fuel usage. (Hansson, J., Månsson, S., Brynolf, S. and Grahn, M., 2019)
[g] ammonia Nox is expected to be similar to the conventional low speed diesel engine (MAN Energy Solutions,2020)
[h] based on Toxicity, Flammability and Storage and Handling
[i] (Hansson, J., Månsson, S., Brynolf, S. and Grahn, M., 2019)Figure 2: Hierarchy tree
table 1: Marine fuel performance
note :in table 1 For sub-criteria that cannot be represented by a single quantitative-information parameter (Available infrastructure, Reliable supply of fuel, Safety, and Upcoming legislation), a four-level scale (1–4) representing Poor, Moderate, Fairly good, and Good is used for grading of underlying aspects, and the average is used to represent the sub-criteria
Criteria
Green Ammonia
Green Hydrogen
Green Methanol
Environmental
3.2
4
2.5
Economic
1.57
2.07
2.39
Technical
1.91
1.84
2.16
Social
2.87
3
2.97
table 3: Marine fuel performance
table 3: Marine fuel performancethen the criteria that are represented by detailed quantitative information are also converted to the range 1–4 ( Table 2). Then a grade has been signed for each criteria by taking the average of sub-criteria. ( Table 3)
table 2: Marine fuel performance
table 2: Marine fuel performance
The following is the pairwise matrixes based on Swedish authorities and ship owners prefrence
Criteria
Environmental Impact
Economic
Technical
Social
Environmental Impact
1
1/9
1/4
1/5
Economic
9
1
3
2
Technical
4
1/3
1
1/2
Social
5
1/2
2
1
sum
19.00
1.94
6.25
3.70
authorities ship owners
Criteria
Environmental Impact
Economic
Technical
Social
Environmental Impact
0.41
0.42
0.40
0.41
Economic
0.10
0.11
0.13
0.10
Technical
0.07
0.05
0.07
0.07
Social
0.41
0.42
0.40
0.41
normalized pairwise matrix
Criteria
criteria weights
Environmental Impact
0.41216
Economic
0.111373
Technical
0.064307
Social
0.41216
Combined weights
Using the data above ( fuel performance and weights ) got the following results ( scores for the fuels:
Based on Authorities preference
Criteria
Criteria Weight
Green Ammonia Grade
Green Ammonia Weighted
Green Hydrogen Grade
Green Hydrogen Weighted
Green Methanol Grade
Green Methanol Weighted
Environm
0.41216
3.2
1.3189
4
1.6486
2.5
1.0304
Economic
0.111373
1.57
0.1749
2.07
0.2305
2.39
0.2661
Technical
0.064307
1.91
0.1228
1.84
0.1184
2.16
0.1389
Social
0.41216
2.87
1.1839
3
1.2365
2.97
1.2241
Total
–
–
2.8005
–
3.234
–
2.6595
Based on ship owners preference:
Criteria
Criteria Weight
Green Ammonia Grade
Green Ammonia Weighted
Green Hydrogen Grade
Green Hydrogen Weighted
Green Methanol Grade
Green Methanol Weighted
Environm
0.04825
3.2
0.1544
4
0.193
2.5
0.1206
Economic
0.502125
1.57
0.7883
2.07
1.0394
2.39
1.2001
Technical
0.168775
1.91
0.3223
1.84
0.3107
2.16
0.3647
Social
0.27765
2.87
0.7966
3
0.8329
2.97
0.8242
Total
–
–
2.0616
–
2.376
–
2.5096
Based on average preference for both Authorities and ship owners: