Performance enhancement of hydrogen liquefaction process via absorption refrigeration and organic Rankine cycle-assisted liquid air energy system
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Storage and distribution of H2 on a large scale is the main challenge due to its low energy density in the gas form.
“Storage and distribution of H2 on a large scale is the main challenge due to its low energy density in the gas form.26”
From Strategies To Improve the Performance of Hydrogen Storage Systems by Liquefaction Methods: A Comprehensive Review (2023) · cites this paper as [26]
The SEC, specific CO2 emissions, and exergy yield were calculated to be 6.71 kWh/kgLH2, 2.641 kgCO2/kgLH2, and 35.7%, respectively.
“The SEC, specific CO2 emissions, and exergy yield were calculated to be 6.71 kWh/kgLH2, 2.641 kgCO2/kgLH2, and 35.7%, respectively.”
From Strategies To Improve the Performance of Hydrogen Storage Systems by Liquefaction Methods: A Comprehensive Review (2023) · cites this paper as [26]
Generally, in H2 liquefaction cycles, ΔTmin values are specified to be about 1-2 °C.
“Generally, in H2 liquefaction cycles, ΔTmin values are specified to be about 1–2 °C.26,71,92,212,214”
From Strategies To Improve the Performance of Hydrogen Storage Systems by Liquefaction Methods: A Comprehensive Review (2023) · cites this paper as [26]
The environmental investigation of a liquid H2 production system integrated with an ACC, a LAC recovery, and an ORC plant demonstrated that the CO2 emission and its total specific were 96372 TPD and 2.641 kgCO2/kgLH2, respectively.
“The environmental investigation of a liquid H2 production system integrated with an ACC, a LAC recovery, and an ORC plant demonstrated that the CO2 emission and its total specific were reported to be 96372 TPD and 2.641 kgCO2/kgLH2, respectively.26”
From Strategies To Improve the Performance of Hydrogen Storage Systems by Liquefaction Methods: A Comprehensive Review (2023) · cites this paper as [26]
Cites
(2018) · doi:10.1016/j.apenergy.2017.12.033 · Cited by 429 · see citing works
Chemical exergies of the elements
Szargut, J. (1989) · Applied Energy · doi:10.1016/0306-2619(89)90016-0 · Cited by 304 · see citing works
A novel hydrogen liquefaction process configuration with combined mixed refrigerant systems
Asadnia, M., & Mehrpooya, M. (2017) · International Journal of Hydrogen Energy · doi:10.1016/j.ijhydene.2017.04.260 · Cited by 207 · see citing works
Qi, M., Park, J., Kim, J., Lee, I., & Moon, I. (2020) · Applied Energy · doi:10.1016/j.apenergy.2020.115049 · Cited by 171 · see citing works
Process plant estimating evaluation and control
Maund, J. K. (1976) · Engineering and Process Economics · doi:10.1016/0377-841x(76)90011-5 · Cited by 161 · see citing works
Ansarinasab, H., Mehrpooya, M., & Sadeghzadeh, M. (2018) · Journal of Cleaner Production · doi:10.1016/j.jclepro.2018.11.090 · Cited by 133 · see citing works
Process optimization and analysis of a novel hydrogen liquefaction cycle
Yin, L., & Ju, Y. (2019) · International Journal of Refrigeration · doi:10.1016/j.ijrefrig.2019.11.004 · Cited by 132 · see citing works
Hydrogen liquefaction and liquid hydrogen storage
Valenti, G. (2016) · Compendium of Hydrogen Energy · doi:10.1016/b978-1-78242-362-1.00002-x · Cited by 120 · see citing works
Analysis of a clean hydrogen liquefaction plant integrated with a geothermal system
Seyam, S., Dinçer, İ., & Agelin‐Chaab, M. (2019) · Journal of Cleaner Production · doi:10.1016/j.jclepro.2019.118562 · Cited by 113 · see citing works
Riaz, A., Qyyum, M. A., Min, S., Lee, S., & Lee, M. (2021) · Applied Energy · doi:10.1016/j.apenergy.2021.117471 · Cited by 107 · see citing works
Self-citationYang, J.-H., Yoon, Y., Ryu, M., An, S.-K., Shin, J., & Lee, C.-J. (2019) · Applied Energy · doi:10.1016/j.apenergy.2019.113840 · Cited by 106 · see citing works
Hydrogen liquefaction process using solar energy and organic Rankine cycle power system
Ghorbani, B., Mehrpooya, M., Aasadnia, M., & Niasar, M. S. (2019) · Journal of Cleaner Production · doi:10.1016/j.jclepro.2019.06.227 · Cited by 99 · see citing works
(2022) · doi:10.1016/j.enconman.2021.114947 · Cited by 89 · see citing works
Self-citationProcess development and exergy cost sensitivity analysis of a novel hydrogen liquefaction process
Sadaghiani, M. S., Mehrpooya, M., & Ansarinasab, H. (2017) · International Journal of Hydrogen Energy · doi:10.1016/j.ijhydene.2017.10.124 · Cited by 75 · see citing works
Aasadnia, M., Mehrpooya, M., & Ansarinasab, H. (2019) · Applied Thermal Engineering · doi:10.1016/j.applthermaleng.2019.113798 · Cited by 63 · see citing works
Özcan, H., & Dinçer, İ. (2016) · Computers & Chemical Engineering · doi:10.1016/j.compchemeng.2016.04.015 · Cited by 57 · see citing works
Rehman, A., Qyyum, M. A., Qadeer, K., Zakir, F., Ding, Y., Lee, M., & Wang, L. (2019) · Applied Energy · doi:10.1016/j.apenergy.2019.114260 · Cited by 54 · see citing works
Self-citationCui, C., Long, N. V. D., Sun, J., & Lee, M. (2020) · Energy · doi:10.1016/j.energy.2020.116998 · Cited by 54 · see citing works
Self-citationSun, K., Zhao, T., Wu, S., & ShengMing, Y. (2021) · Energy Reports · doi:10.1016/j.egyr.2021.01.004 · Cited by 39 · see citing works
Qyyum, M. A., Qadeer, K., Ahmad, A., Ahmed, F., & Lee, M. (2019) · Journal of Cleaner Production · doi:10.1016/j.jclepro.2019.119189 · Cited by 36 · see citing works
Self-citationZhang, J., Meerman, H., Benders, R. M. J., & Faaij, A. P. C. (2019) · Energy · doi:10.1016/j.energy.2019.116592 · Cited by 32 · see citing works
Concepts for Large Scale Hydrogen Liquefaction Plants
Eckroll, J. (2017) · BIBSYS Brage (BIBSYS (Norway)) · Cited by 14 · see citing works
Qyyum, M. A., Naquash, A., Ali, W., Haider, J., Noon, A. A., Rehan, M., Nizami, A., Yasin, M., & Lee, M. (2021) · Frontiers in Energy Research · doi:10.3389/fenrg.2021.663261 · Cited by 4 · see citing works
Self-citation
Flagged first, then by citations
Cited by
Sorted by citations
Hydrogen storage in North America: Status, prospects, and challenges
Ghorbani, B., Zendehboudi, S., Saady, N. M. C., & Dusseault, M. B. (2023) · Journal of environmental chemical engineering · doi:10.1016/j.jece.2023.109957 · Cited by 124 · see citing works
Ghorbani, B., Zendehboudi, S., Saady, N. M. C., Duan, X., & Albayati, T. M. (2023) · ACS Omega · doi:10.1021/acsomega.3c01072 · Cited by 121 · see citing works
Yang, Y. X., Tong, L., Yin, S., Liu, Y., Wang, L., Qiu, Y., & Ding, Y. (2022) · Journal of Cleaner Production · doi:10.1016/j.jclepro.2022.134347 · Cited by 106 · see citing works
Yang, Y. X., Tong, L., Liu, Y., Guo, W., Wang, L., Qiu, Y., & Ding, Y. (2023) · Energy Conversion and Management · doi:10.1016/j.enconman.2023.116799 · Cited by 95 · see citing works
Geng, J., & Sun, H. (2023) · Energy · doi:10.1016/j.energy.2022.125410 · Cited by 70 · see citing works
Significance of ortho-para hydrogen conversion in the performance of hydrogen liquefaction process
Riaz, A., Qyyum, M. A., Hussain, A., & Lee, M. (2022) · International Journal of Hydrogen Energy · doi:10.1016/j.ijhydene.2022.09.022 · Cited by 67 · see citing works
Self-citationYang, J. G., Li, Y., & Tan, H. (2023) · Applied Energy · doi:10.1016/j.apenergy.2023.121372 · Cited by 67 · see citing works
Chen, X., Yue, J., Fu, L. Z., Zhang, M., Tang, M. G., Feng, J., & Shen, B. (2023) · Journal of Cleaner Production · doi:10.1016/j.jclepro.2023.138653 · Cited by 61 · see citing works
Seyyedattar, M., Zendehboudi, S., Ghamartale, A., & Afshar, M. (2024) · International Journal of Hydrogen Energy · doi:10.1016/j.ijhydene.2024.04.230 · Cited by 58 · see citing works
Gong, C., Na, H., Kim, H., Yun, S., Cho, H., & Won, W. (2024) · ACS Sustainable Chemistry & Engineering · doi:10.1021/acssuschemeng.4c01921 · Cited by 43 · see citing works
Yang, J. G., Li, Y., & Tan, H. (2023) · International Journal of Hydrogen Energy · doi:10.1016/j.ijhydene.2023.09.246 · Cited by 40 · see citing works
Zhang, L., Ye, K., Wang, Y., Han, W., Xie, M., & Chen, L. (2023) · Energy · doi:10.1016/j.energy.2023.129867 · Cited by 39 · see citing works
Chen, S., Qiu, C., Shen, Y., Tao, X., & Gan, Z. (2023) · Energy · doi:10.1016/j.energy.2023.129563 · Cited by 35 · see citing works
Sleiti, A. K., Al‐Ammari, W. A., & Ghani, S. A. (2023) · Journal of Energy Storage · doi:10.1016/j.est.2023.107471 · Cited by 31 · see citing works
Efficient Heat Exchange Configuration for Sub-Cooling Cycle of Hydrogen Liquefaction Process
Park, S., Noh, W., Park, J., Park, J., & Lee, I. (2022) · Energies · doi:10.3390/en15134560 · Cited by 29 · see citing works
Sleiti, A. K., & Al‐Ammari, W. A. (2022) · International Journal of Hydrogen Energy · doi:10.1016/j.ijhydene.2022.04.233 · Cited by 28 · see citing works
Khodaparast, S., Zare, V., & Mohammadkhani, F. (2023) · Process Safety and Environmental Protection · doi:10.1016/j.psep.2023.01.003 · Cited by 28 · see citing works
Taghavi, M., & Lee, C. (2024) · Fuel · doi:10.1016/j.fuel.2024.133826 · Cited by 26 · see citing works
Ghorbani, B., Zendehboudi, S., Saharkhiz, M. H. M., Afrouzi, Z. A., Mohammadzadeh, O., & Elkamel, A. (2023) · Energy & Fuels · doi:10.1021/acs.energyfuels.3c01756 · Cited by 25 · see citing works
Bian, J., Zhang, R., Cao, X., Yang, J. G., Li, J., & Yu, B. (2025) · Renewable Energy · doi:10.1016/j.renene.2025.123112 · Cited by 24 · see citing works
Ghorbani, B., Zendehboudi, S., Afrouzi, Z. A., Lohi, A., & Khan, F. I. (2024) · Industrial & Engineering Chemistry Research · doi:10.1021/acs.iecr.3c04286 · Cited by 23 · see citing works
Sun, X.-J., Zhuang, Y., Liu, L., Dong, Y., Zhang, L., & Du, J. (2022) · Applied Energy · doi:10.1016/j.apenergy.2022.119366 · Cited by 23 · see citing works
Kim, Y., Qi, M., Cho, J., Lee, I., Park, J., & Moon, I. (2023) · Energy · doi:10.1016/j.energy.2023.129093 · Cited by 21 · see citing works
Gursoy, M., & Dinçer, İ. (2024) · International Journal of Thermofluids · doi:10.1016/j.ijft.2024.100599 · Cited by 19 · see citing works
Rad, H. N., Ghasemi, A. M., & Marefati, M. (2024) · Heliyon · doi:10.1016/j.heliyon.2024.e29087 · Cited by 19 · see citing works
Islam, M. R., Al-Sobhi, S. A., Naquash, A., Qyyum, M. A., & Lee, M. (2023) · Energy · doi:10.1016/j.energy.2023.129757 · Cited by 17 · see citing works
Self-citationIm, J., Gye, H.-R., Wilailak, S., Yoon, H.-J., Kim, Y., Kim, H., & Lee, C. (2024) · Energy · doi:10.1016/j.energy.2024.132698 · Cited by 17 · see citing works
Wang, C., Jiang, W., Yang, F., Qiao, Y., Gao, Y., & Lv, Y. (2025) · Energy · doi:10.1016/j.energy.2025.135920 · Cited by 16 · see citing works
Yu, C., Choi, M., & Chang, D. (2024) · International Journal of Hydrogen Energy · doi:10.1016/j.ijhydene.2024.11.334 · Cited by 15 · see citing works
Xu, M., Li, S., Jin, Z., Jiang, W., & Du, K. (2023) · Applied Thermal Engineering · doi:10.1016/j.applthermaleng.2023.121297 · Cited by 15 · see citing works
Kim, Y., Mun, H., Kim, M., Moon, I., Park, J., Lee, I., & Kim, J. (2025) · Energy · doi:10.1016/j.energy.2025.134533 · Cited by 14 · see citing works
Canada’s Hydrogen Future: Innovations, Policies, and Global Perspectives
Ghorbani, B., Zendehboudi, S., Saady, N. M. C., & Naterer, G. F. (2025) · Energy & Fuels · doi:10.1021/acs.energyfuels.5c00056 · Cited by 13 · see citing works
Zhang, Q., Huang, X., Zhang, S., Shen, Y., Xu, H., Sun, M., Wang, Q., & Zhao, L. (2023) · Case Studies in Thermal Engineering · doi:10.1016/j.csite.2023.103363 · Cited by 13 · see citing works
Riaz, A., Qyyum, M. A., Hussain, A., & Lee, M. (2023) · Journal of Energy Storage · doi:10.1016/j.est.2023.108193 · Cited by 12 · see citing works
Self-citationSial, N. R., Qyyum, M. A., & Lee, M. (2024) · International Journal of Hydrogen Energy · doi:10.1016/j.ijhydene.2024.04.088 · Cited by 12 · see citing works
Self-citationChen, X., Pang, Z., Jiang, S., Zhang, M., Feng, J., Fu, L. Z., & Shen, B. (2023) · Energy · doi:10.1016/j.energy.2023.126871 · Cited by 12 · see citing works
Zheng, X., Zhang, J., Li, Y., Yuan, H., Pan, Y., & Mei, N. (2025) · International Journal of Refrigeration · doi:10.1016/j.ijrefrig.2025.06.032 · Cited by 8 · see citing works
Niu, B., Chen, L., Zhang, Z., Lv, H., Qu, J., Li, S., Zhang, Z., Chen, S., & Hou, Y. (2025) · International Journal of Hydrogen Energy · doi:10.1016/j.ijhydene.2025.05.352 · Cited by 7 · see citing works
Zhang, R., Cao, X., Ai, D., Zhu, J., Cai, W., & Bian, J. (2025) · Energy · doi:10.1016/j.energy.2025.138424 · Cited by 7 · see citing works
Sleiti, A. K., & Al‐Ammari, W. A. (2024) · International Journal of Hydrogen Energy · doi:10.1016/j.ijhydene.2024.08.391 · Cited by 7 · see citing works
Comprehensive review of advances and challenges in hydrogen liquefaction
Ahmad, A., Nnabuife, S. G., Oko, E., & Ibhadon, A. O. (2025) · Next Sustainability · doi:10.1016/j.nxsust.2025.100192 · Cited by 5 · see citing works
Physical-based hydrogen storage
Zendehboudi, S., & Ghorbani, B. (2025) · Elsevier eBooks · doi:10.1016/b978-0-443-24042-3.00003-5 · Cited by 5 · see citing works
Riaz, A., Qyyum, M. A., Naquash, A., & Lee, M. (2023) · Applied Thermal Engineering · doi:10.1016/j.applthermaleng.2023.120983 · Cited by 5 · see citing works
Self-citationTang, F., Pan, J., Han, F., Yu, J., Fang, J., & Li, R. (2026) · International Journal of Hydrogen Energy · doi:10.1016/j.ijhydene.2025.153256 · Cited by 4 · see citing works
Eyvazi, A., Ameri, M., Dehaj, M. S., & Ghaebi, H. (2025) · Heat Transfer · doi:10.1002/htj.70124 · Cited by 3 · see citing works
Ghorbani, B., Zendehboudi, S., Bagheri, M., Saady, N. M. C., Albayati, T. M., & Venkatachalam, P. (2026) · Energy & Fuels · doi:10.1021/acs.energyfuels.5c04988 · Cited by 3 · see citing works
Banijamali, S. M., Ilinca, A., Afrouzi, A. A., & Rousse, D. R. (2025) · Processes · doi:10.3390/pr13051349 · Cited by 3 · see citing works
Factors Affecting Energy Consumption in Hydrogen Liquefaction Plants
Xue, J., & Boukadi, F. H. (2025) · Processes · doi:10.3390/pr13082611 · Cited by 2 · see citing works
Eyvazi, A., Ameri, M., Dehaj, M. S., & Ghaebi, H. (2025) · Advances in Mechanical Engineering · doi:10.1177/16878132251365041 · Cited by 2 · see citing works
New insights into hydrogen production, utilization, and storage
Zendehboudi, S., & Ghorbani, B. (2025) · Elsevier eBooks · doi:10.1016/b978-0-443-24042-3.00006-0 · Cited by 2 · see citing works
Rahadiyan, L., Aziz, M., & Nasruddin, N. (2024) · International Journal of Hydrogen Energy · doi:10.1016/j.ijhydene.2025.02.141 · Cited by 2 · see citing works
Rahadiyan, L., Aziz, M., & Nasruddin, N. (2024) · IOP Conference Series Earth and Environmental Science · doi:10.1088/1755-1315/1372/1/012102 · Cited by 2 · see citing works
Effective and Realistic Strategies for Large-Scale Liquid Hydrogen Production
Yang, J. G., & Li, Y. (2025) · Cryo · doi:10.3390/cryo1020008 · Cited by 1 · see citing works
Yehia, F., Al‐Haimi, A. A. N. M., Byun, Y., Kim, J., Feng, C., Cao, Y., Yun, Y., Kim, J., Yang, C., Liu, L., et al. (2025) · Energy · doi:10.1016/j.energy.2025.137542 · Cited by 1 · see citing works
Cavitation characteristics analysis in suction process of a high-pressure liquid hydrogen pump
Peng, Z., Zou, H., Xu, P., Zhao, B., Ren, S., Jia, X., & Peng, X. (2026) · International Journal of Hydrogen Energy · doi:10.1016/j.ijhydene.2026.153528 · Cited by 1 · see citing works
A study on hydrogen liquefaction coupled with liquid air energy storage
Zhiping, W., & Wang, Q. (2025) · IOP Conference Series Materials Science and Engineering · doi:10.1088/1757-899x/1327/1/012092 · Cited by 1 · see citing works
Sleiti, A. K., & Al‐Ammari, W. A. (2024) · doi:10.46855/energy-proceedings-11219 · Cited by 1 · see citing works
Kim, Y., Mun, H., Kim, M., Moon, I., Park, J., Lee, I., & Kim, J. (2024) · SSRN Electronic Journal · doi:10.2139/ssrn.4907988 · Cited by 1 · see citing works
Pratyush, A., Raju, V. D., Babu, K. S., & Oliva, M. (2023) · Green energy and technology · doi:10.1007/978-981-99-2279-6_21
Design and performance analysis of energy efficient hydrogen liquefaction process
Naquash, A., & Lee, M. (2023) · Computer-aided chemical engineering/Computer aided chemical engineering · doi:10.1016/b978-0-443-15274-0.50140-2
Self-citationEconomic and environmental assessment of liquid hydrogen plants
Sleiti, A. K., & Al‐Ammari, W. A. (2024) · Elsevier eBooks · doi:10.1016/b978-0-443-21438-7.00005-4
Current and future hydrogen liquefaction technologies—design and analysis
Sleiti, A. K., & Al‐Ammari, W. A. (2024) · Elsevier eBooks · doi:10.1016/b978-0-443-21438-7.00001-7
Li, T., Zhang, Y., Qiao, Y., Yu, H., & Yuan, Y. (2024) · SSRN Electronic Journal · doi:10.2139/ssrn.4816321
Process efficiency enhancement of integrated hydrogen enrichment and liquefaction
Islam, M. R., Naquash, A., Rehman, A., & Lee, M. (2024) · Computer-aided chemical engineering/Computer aided chemical engineering · doi:10.1016/b978-0-443-28824-1.50095-8
Self-citationEyvazi, A., Ameri, M., Dehaj, M. S., & Ghaebi, H. (2026) · AIP Advances · doi:10.1063/5.0278534
Hwang, J.-H., Yehia, F., Al‐Haimi, A. A. N. M., Feng, C., Cao, Y., Byun, Y., Kim, J., Yun, Y., Kim, J., Yang, C., et al. (2025) · SSRN Electronic Journal · doi:10.2139/ssrn.5234055
Nanocomposites of Carbohydrate Polymers for Hydrogen Storage
Srinivas, B., Espenti, C. S., Surendra, T. V., Pillai, M. V., & Mallikarjun, A. (2025) · Smart nanomaterials technology · doi:10.1007/978-981-96-2171-2_17
Tang, F., Pan, J., Zhang, Y., Liu, Y., & Li, R. (2026) · Energy · doi:10.1016/j.energy.2026.141519
Bilal, M., Salam, M. A., Naquash, A., & Qyyum, M. A. (2026) · Hydrogen Economy & Engineering · doi:10.1016/j.hee.2026.100011
Self-citationZhang, S., Song, Z., Lei, L., Li, K., & Liu, G. (2026) · Energy · doi:10.1016/j.energy.2026.142435
Pranto, R. H., Roy, N. C., Zinatunnesa, U. W., Aziz, M., & Mourshed, M. (2026) · Advanced Energy and Sustainability Research · doi:10.1002/aesr.70256
Nematollahi, A., Baneshi, M., & Mousavi, S. A. (2026) · Energy Conversion and Management · doi:10.1016/j.enconman.2026.122267
- Authors
- Naquash, A., Qyyum, M. A., Islam, M., Sial, N. R., Min, S., Lee, S., & Lee, M.
- Affiliations
- Yeungnam University (KR)
- Sultan Qaboos University (OM)
- Korea Gas Corporation (South Korea) (KR)
- Corresponding author
- Lee, Moonyong
- Venue
- Energy Conversion and Management
- Publisher
- Elsevier BV
- Published
- 2022-02
- Volume
- 254
- Pages
- 115200
- ISSN
- 0196-8904 (ISSN-L)
- OpenAlex
- W4206908613
- Cited by
- 72
- References
- 23
- Citations by year
- 2026: 9 · 2025: 19 · 2024: 18 · 2023: 20 · 2022: 6
- FWCI
- 5.94
- Type
- journal article
- Language
- en
- Open access
- closed
- Licence
- Locations
- Energy Conversion and Management (publishedVersion)
- Funders
- Ministry of Trade, Industry and Energy
- Ministry of Science, ICT and Future Planning (2021R1A2C1092152)
- National Research Foundation of Korea
- Korea Institute of Energy Technology Evaluation and Planning (20204010600100)
- Ministry of Education (2014R1A6A1031189)
- Topics
- Physical Sciences › Engineering › Mechanical Engineering › Thermodynamic and Exergetic Analyses of Power and Cooling Systems
- Physical Sciences › Engineering › Aerospace Engineering › Spacecraft and Cryogenic Technologies
- Physical Sciences › Engineering › Control and Systems Engineering › Process Optimization and Integration
- Keywords
- hydrogen liquefaction, absorption refrigeration, organic Rankine cycle, liquid air energy storage, ammonia-water absorption, waste heat recovery, exergy analysis, energy consumption, CO2 emissions, process integration, vapor compression refrigeration, capital investment
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