534
D. Hara et al.
The work to compress or expand hydrogen was calculated using the transmission, mechanical, and adiabatic efficiencies and the enthalpy data before and after
compression or expansion (Takahashi 1976; National Institute of Standards and Technology 2019). After the calculation of the compression or expansion work, exergy
analysis was conducted using Eqs. (35.1)–(35.5).
35.3.4 Hydrogen Storage Using MH
The MH used in this study was LmNi 4.73 Mn 0.12 Al 0.1 . Here, the authors investigated
the relationship between the MH weight and the amount of hydrogen stored and
discharged in MH experimentally. These experimental data were used to determine
the amount of MH needed for each mobility and the amount of hydrogen that can
be stored in that amount of MH. Figure 35.3 shows this relationship. According
to these regression lines, the amount of MH used in each mobility are 349.75
(car), 8.21 (bicycle), 91.24 (Forklift) kg-MH respectively (TOYOTA, “The MIRAI
Life Cycle Assessment for communication”Available: http://www.gronabilister.se/
toyota-mirai-lca.pdf?cms_fileid=9b81589a2a7ae33e34936c3de80b4c51; “Fuel cell
forklift catalog” 2010) (Pragma industries 2019).
The storage experiment was completed under a condition (273.15 K and 0.4000
MPa) for easy storage of hydrogen. However, the hydrogen discharge experiment
was completed under standard conditions. From Fig. 35.3, it can be seen that all the
hydrogen stored in the MH cannot be discharged (approximately 6.52% hydrogen
remained in the MH). Therefore, the hydrogen paths, including MH, need to produce
an extra amount of hydrogen.
In this study, the exergy loss of the hydrogen paths, including the hydrogen
production from woody biomass, was considered because hydrogen should be
compressed for transportation. However, the exergy loss of hydrogen storage and
discharge from MH was not considered because we used the complicated MH
(LmNi 4.73 Mn 0.12 Al 0.15 ) and could not obtain accurate chemical exergy data for this
Fig. 35.3 Discharge and
storage regression lines
D. Hara et al.
The work to compress or expand hydrogen was calculated using the transmission, mechanical, and adiabatic efficiencies and the enthalpy data before and after
compression or expansion (Takahashi 1976; National Institute of Standards and Technology 2019). After the calculation of the compression or expansion work, exergy
analysis was conducted using Eqs. (35.1)–(35.5).
35.3.4 Hydrogen Storage Using MH
The MH used in this study was LmNi 4.73 Mn 0.12 Al 0.1 . Here, the authors investigated
the relationship between the MH weight and the amount of hydrogen stored and
discharged in MH experimentally. These experimental data were used to determine
the amount of MH needed for each mobility and the amount of hydrogen that can
be stored in that amount of MH. Figure 35.3 shows this relationship. According
to these regression lines, the amount of MH used in each mobility are 349.75
(car), 8.21 (bicycle), 91.24 (Forklift) kg-MH respectively (TOYOTA, “The MIRAI
Life Cycle Assessment for communication”Available: http://www.gronabilister.se/
toyota-mirai-lca.pdf?cms_fileid=9b81589a2a7ae33e34936c3de80b4c51; “Fuel cell
forklift catalog” 2010) (Pragma industries 2019).
The storage experiment was completed under a condition (273.15 K and 0.4000
MPa) for easy storage of hydrogen. However, the hydrogen discharge experiment
was completed under standard conditions. From Fig. 35.3, it can be seen that all the
hydrogen stored in the MH cannot be discharged (approximately 6.52% hydrogen
remained in the MH). Therefore, the hydrogen paths, including MH, need to produce
an extra amount of hydrogen.
In this study, the exergy loss of the hydrogen paths, including the hydrogen
production from woody biomass, was considered because hydrogen should be
compressed for transportation. However, the exergy loss of hydrogen storage and
discharge from MH was not considered because we used the complicated MH
(LmNi 4.73 Mn 0.12 Al 0.15 ) and could not obtain accurate chemical exergy data for this
Fig. 35.3 Discharge and
storage regression lines