Theoretical and experimental study on the selection of pure and mixed refrigerants for a power-cooling system driven by ultra-low-grade heat

Sleiti, Ahmad K.; Al‐Ammari, Wahib A.; Musharavati, Farayi

doi:10.1016/j.tsep.2023.101962

Cited by 4 publications

(1 citation statement)

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“…The second approach is limited by the location of the LNG regasification and the available space to build LHS without safety concerns. Thus, the third approach is the most feasible way to reduce the energy consumption of LHS or other cryogenic processes [14].…”

Section: Introductionmentioning

confidence: 99%

Design and analysis of a novel liquid hydrogen production system using dual mixed refrigerant-based cryogenic precooling and liquefaction processes

Sleiti,

Al-Ammari

2024

Preprint

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This study presents an innovative LH2 production system using dual mixed refrigerant (DMR)-based cryogenic processes. New dual-refrigeration loops are developed for the precooling and liquefaction of the gaseous hydrogen with two distinguished mixed refrigerants for each process. Thorough energy, exergy, economic, and environmental (4E) analyses are conducted for the proposed LH2 system in this study. The proposed system produces LH2 with an energy consumption of 3.732 kWh/kgLH2, 48% lower than the single mixed refrigerant SMR-based systems and 70% lower than the current commercial plants. Furthermore, the exergy efficiency (59.65%) of the present system is enhanced by 33% compared to the SMR-based systems (44.89). In addition, the present system produces LH2 with a levelized cost of 1.89 $/kgLH2, which is 21% lower than that for SMR-based large-scale systems and 70% lower than that of small-scale systems. Environmentally, the proposed DMR-LH2 system reduced CO2 emissions by 29-69% compared to large-scale SMR-based systems. Moreover, the DMR-LH2 system is characterized by more flexibility in the design of the process equipment and eliminates the potential for freezing problems. This study's dual mixed cryogenic refrigeration approach provides guidelines for future research to improve the technical and economic feasibility of LH2 production, making it competitive with other energy storage and transportation options.

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Section: Introductionmentioning

confidence: 99%