Abstract Effective utilization of liquefied natural gas (LNG) cold energy during its regasification in both renewable and nonrenewable processes is discussed and analyzed. Conventional and non-conventional thermodynamic cycles, are described and categorized. Expressions for exergy and energy efficiencies are developed to facilitate evaluation of the processes. Finally suggestions for improving the efficiency of such systems are developed and the technical advantages and challenges are pointed out. The obtained results indicate that, among the considered cycles, the highest energy and exergy efficiencies are about 86.3% and 80.0% respectively; which is related to the combined cycles. Conversely the lowest energy and exergy efficiencies occur in other application of LNG cold energy cycles (i.e., production of hydrogen by a solar aid liquefied natural gas hybrid CO2 cycle) and Rankine cycle (i.e., CO2 transcritical geothermal power generation cycle) with the values of 7.39% and 7.95%; respectively.

中文翻译：

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集成 LNG 再气化工艺配置的热力学分析

摘要 讨论和分析了可再生和不可再生过程中液化天然气 (LNG) 再气化过程中冷能的有效利用。描述和分类了常规和非常规热力学循环。开发了火用和能源效率的表达式，以促进对过程的评估。最后提出了提高此类系统效率的建议，并指出了技术优势和挑战。所得结果表明，在所考虑的循环中，最高的能量和火用效率分别约为 86.3% 和 80.0%；这与联合循环有关。相反，最低的能量和火用效率出现在 LNG 冷能循环的其他应用中（即，通过太阳能辅助液化天然气混合二氧化碳循环）和兰金循环（即二氧化碳跨临界地热发电循环）生产氢气，其值为 7.39% 和 7.95%；分别。