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Energy, exergy, and economic analyses of a novel liquid air energy storage system with cooling, heating, power, hot water, and hydrogen cogeneration
Energy Conversion and Management ( IF 10.4 ) Pub Date : 2024-03-06 , DOI: 10.1016/j.enconman.2024.118262 Xingqi Ding , Yufei Zhou , Nan Zheng , Yuanhui Wang , Ming Yang , Liqiang Duan
Energy Conversion and Management ( IF 10.4 ) Pub Date : 2024-03-06 , DOI: 10.1016/j.enconman.2024.118262 Xingqi Ding , Yufei Zhou , Nan Zheng , Yuanhui Wang , Ming Yang , Liqiang Duan
Liquid air energy storage (LAES) technology has received significant attention in the field of energy storage due to its high energy storage density and independence from geographical constraints. Hydrogen energy plays a crucial role in addressing global warming and environmental pollution. While there is substantial research in both domains, the investigation in the crossover field has not been made. To fill this gap, a novel LAES system coupling solar heat and hydrogen production is proposed, where solar energy is utilized as an external heat source to enhance the net power output. The system's performances are evaluated from the perspectives of energy, exergy, and economic viability. Under rated conditions, the novel system can generate 58,793.5 kW of electricity, 26,918.5 kW of cooling energy, 34,938.8 kW of heating energy, 67.94 kg/s of domestic hot water, and 12.17 mol/s of hydrogen. In comparison to the standalone LAES system, the novel system demonstrates a 20.76 percentage point increase in energy efficiency but undergoes a 14.61 percentage point reduction in exergy efficiency. The economic performance of the novel system has experienced substantial enhancement when compared to the standalone LAES system. Taking the Beijing region as an example, the net present value has risen by 422.38 million USD, the levelized cost of energy has decreased by 0.0818 USD/kWh, and the payback period has reduced by 7.47 years. Additionally, the impact of proton exchange membrane electrolyzer cell operating temperature, air turbine inlet temperature, electricity price fluctuations, and regional factors on the system performance are also investigated.
更新日期：2024-03-06
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