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Thermodynamics and Economics of Different Asymmetric Cold Energy Transfer in a Liquid Air Energy Storage System
Energy Technology ( IF 3.6 ) Pub Date : 2020-03-09 , DOI: 10.1002/ente.201901487 Luna Guo 1, 2 , Zhaozhao Gao 1, 2 , Wei Ji 1 , Hao Xu 1, 2 , Liubiao Chen 1 , Junjie Wang 1, 2
Energy Technology ( IF 3.6 ) Pub Date : 2020-03-09 , DOI: 10.1002/ente.201901487 Luna Guo 1, 2 , Zhaozhao Gao 1, 2 , Wei Ji 1 , Hao Xu 1, 2 , Liubiao Chen 1 , Junjie Wang 1, 2
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Liquid air energy storage is a promising large‐scale energy storage technology. However, the asymmetric cold energy transfer exists due to the cold energy loss during the intermission period (the transition time between the charging and discharging process), which seriously affects the system efficiency. Most theoretical researches are based on the ideal cold energy storage (CES) models, failing to predict the characteristics of the asymmetric energy transfer. Therefore, a new self‐adapting modified Linde cycle (I) is built for the imperfect CES. Two methods of cold energy supplement to increase the CES efficiency are investigated, including a modified Linde cycle with an external cold source of liquid nitrogen (II) and a modified Claude cycle (III). Thermodynamics and economics are compared for three modes. The influences of adiabatic efficiencies of the compressor and the turbine on the system are analyzed. The results show that modes II and III can achieve the higher energy, exergy efficiencies compared to mode I. Mode III has the highest round‐trip efficiency and the largest gaps of III–I and III–II are 2.3% and 2.5%, respectively. Mode III owns the best economic performance and the annual total profit is 185.3–836.6 k$ higher than that of mode I.
中文翻译：
液体空气储能系统中不同不对称冷能传递的热力学和经济学
液态空气储能是一种有前途的大规模储能技术。但是，由于间歇期间的冷能损失（充放电过程之间的过渡时间）而存在不对称的冷能传递，严重影响了系统效率。大多数理论研究都基于理想的冷能存储（CES）模型，但无法预测不对称能量传输的特征。因此，针对不完善的CES构建了新的自适应修改的Linde周期（I）。研究了两种增加冷能以提高CES效率的方法，包括使用液态氮外部冷源的改进的Linde循环（II）和改进的Claude循环（III）。比较了三种模式的热力学和经济学。分析了压缩机和涡轮的绝热效率对系统的影响。结果表明，与模式I相比，模式II和III可以实现更高的能量和火用效率。模式III的往返效率最高，III–I和III–II的最大差距分别为2.3％和2.5％ 。模式III具有最佳的经济表现，年总利润比模式I高出185.3–836.6 k $。
更新日期：2020-03-09
中文翻译：
液体空气储能系统中不同不对称冷能传递的热力学和经济学
液态空气储能是一种有前途的大规模储能技术。但是，由于间歇期间的冷能损失（充放电过程之间的过渡时间）而存在不对称的冷能传递，严重影响了系统效率。大多数理论研究都基于理想的冷能存储（CES）模型，但无法预测不对称能量传输的特征。因此，针对不完善的CES构建了新的自适应修改的Linde周期（I）。研究了两种增加冷能以提高CES效率的方法，包括使用液态氮外部冷源的改进的Linde循环（II）和改进的Claude循环（III）。比较了三种模式的热力学和经济学。分析了压缩机和涡轮的绝热效率对系统的影响。结果表明，与模式I相比，模式II和III可以实现更高的能量和火用效率。模式III的往返效率最高，III–I和III–II的最大差距分别为2.3％和2.5％ 。模式III具有最佳的经济表现，年总利润比模式I高出185.3–836.6 k $。
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