Abstract
For an integrated liquefied air energy storage and electricity generation system, mathematical models of the liquefied air energy storage and electricity generation process are established using a thermodynamic theory. The effects of the outlet pressure of the compressor unit, the outlet pressure of the cryogenic pump, the heat exchanger effectiveness, the initial air temperature and pressure before throttling on the performances of the integrated liquefied air energy storage, and the electricity generation system are investigated, using the cycle efficiency and liquid air yield ratio as the evaluation indexes. The results show that if the compressor outlet pressure is raised, both the compression work and the expansion work increase, but because the expansion work increases more slowly, the cycle efficiency of the system gradually decreases. Increasing the cryogenic pump outlet pressure and heat exchanger effectiveness can significantly increase the cycle efficiency of the system; the higher the air pressure and the lower the air temperature before throttling, the greater the liquid air yield after expansion, and the higher the cycle efficiency. The theoretical analysis models and research results can provide a reference for the development of an integrated system of liquefied air energy storage and electricity production, as well as for the development of medium-capacity energy storage technology.
Highlights
A complete cycle of the liquefied air energy storage system includes two stages, the liquefied energy storage and the energy released to power generation
The air cannot be liquefied completely, the liquefaction rate cannot reach 100%. It can be seen from the conservation of energy, that the heat collected during the compression process is not fully used in the release phase, so the increase of the expansion work is cannot reach 100%
It can be seen from the conservation of energy, that the heat collected during the compression process is not fully used in the release phase, so the increase of the expansion work is slowerPressure than that compression
Summary
Wind, and other renewable energies are widely used to generate electricity in the world [1,2,3,4,5] For these energy forms, because of their characteristics of instability and intermittence [6,7], efficient energy storage technologies are required in order for a sustained and stable output [8,9,10,11,12]. Energy storage technologies, such as bulk power management, compressed air energy storage (CAES), and pumped hydroelectricity storage (PHS) [13,14,15,16], are presently relatively mature and reliable. More detailed effects will be discussed regarding the outlet pressure of the compressor and cryogenic pump, the efficiency of the heat exchanger, the air temperature and pressure before the throttle on the cycle efficiency, and the liquid air yield
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
