Liquid Air Energy Storage for Decentralized Micro Energy Networks with Combined Cooling, Heating, Hot Water and Power Su
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https://doi.org/10.1007/s11630-020-1396-x
Article ID: 1003-2169(2020)00-0000-00
Liquid Air Energy Storage for Decentralized Micro Energy Networks with Combined Cooling, Heating, Hot Water and Power Supply SHE Xiaohui1, ZHANG Tongtong1, PENG Xiaodong1, WANG Li2, TONG Lige2, LUO Yimo3, ZHANG Xiaosong4, DING Yulong1,2* 1. Birmingham Centre for Energy Storage & School of Chemical Engineering, University of Birmingham, Birmingham B15 2TT, UK 2. School of Energy and Environmental Engineering, University of Science & Technology Beijing, Beijing 100083, China 3. College of Civil Engineering, Hunan University, Changsha 410082, China 4. School of Energy and Environment, Southeast University, Nanjing 210096, China © The Author(s) 2020
Abstract: Liquid air energy storage (LAES) has been regarded as a large-scale electrical storage technology. In this paper, we first investigate the performance of the current LAES (termed as a baseline LAES) over a far wider range of charging pressure (1 to 21 MPa). Our analyses show that the baseline LAES could achieve an electrical round trip efficiency (eRTE) above 60% at a high charging pressure of 19 MPa. The baseline LAES, however, produces a large amount of excess heat particularly at low charging pressures with the maximum occurred at ~1 MPa. Hence, the performance of the baseline LAES, especially at low charging pressures, is underestimated by only considering electrical energy in all the previous research. The performance of the baseline LAES with excess heat is then evaluated which gives a high eRTE even at lower charging pressures; the local maximum of 62% is achieved at ~4 MPa. As a result of the above, a hybrid LAES system is proposed to provide cooling, heating, hot water and power. To evaluate the performance of the hybrid LAES system, three performance indicators are considered: nominal-electrical round trip efficiency (neRTE), primary energy savings and avoided carbon dioxide emissions. Our results show that the hybrid LAES can achieve a high neRTE between 52% and 76%, with the maximum at ~5 MPa. For a given size of hybrid LAES (1 MW×8 h), the primary energy savings and avoided carbon dioxide emissions are up to 12.1 MWh and 2.3 ton, respectively. These new findings suggest, for the first time, that small-scale LAES systems could be best operated at lower charging pressures and the technologies have a great potential for applications in local decentralized micro energy networks.
Keywords: liquid air energy storage, cryogenic energy storage, micro energy grids, combined heating, cooling and power supply, heat pump
1. Introduction Liquid air energy storage (LAES) is gaining increasing attention for large-scale electrical storage in recent years Received: Jul 08, 2020
AE: GUO Shaopeng
due to the advantages of high energy density, ambient pressure storage, no geographical constraints and potentially highly competitive costs. These features make the LAES technology attractive for load-shifting of
Corresponding author: DING Yulong
E-mail: [email protected] www.springerlink.co
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