Enhanced Carnot battery system with integrated dual pressure condensation/evaporation technologies

doi:10.19799/j.cnki.2095-4239.2025.0017

Abstract

Abstract:

To address the low round-trip efficiency of traditional Carnot battery systems, this study proposes a dual-pressure condensation/evaporation Carnot battery (DCB) system. This innovative system integrates dual-pressure evaporation organic Rankine cycle (DORC) and dual-pressure condensation heat pump (DHP) technologies, effectively reducing irreversible losses in the heat exchange process of the CB system. System modeling and analysis were conducted to evaluate the operating characteristics of the DCB system under varying conditions, exploring its feasibility. The results show that the energy efficiency coefficient of DHP and the power generation efficiency of the DORC module increase first and then decline as intermediate water temperature rises. Across varying heat sources and ambient temperatures, the round-trip efficiency of the DCB system is higher than that of the CB system. Taking Harbin, Nanjing, and Guangzhou as examples shows distinct benefits of the DCB. Harbin displayed the greatest improvement in annual round-trip efficiency, reaching 70.5%, while Guangzhou achieved the highest operational revenue. Under daily power generation conditions of 100 kWh, the annual revenue of the DCB system increases by 18077 RMB compared to the CB system. The proposed DCB system effectively addresses the low round-trip efficiency of CB systems and holds significant potential for balancing grid loads and promoting efficient utilization of renewable energy. It also offers a more efficient solution for renewable energy storage under the dual carbon strategy.

Key words: Carnot battery, dual pressure evaporation, dual pressure condensation, feasibility

CLC Number:

TB 657

Xun CHEN, Dundun WANG, Xiao HU, Minxia LI, Yunkai YUE. Enhanced Carnot battery system with integrated dual pressure condensation/evaporation technologies[J]. Energy Storage Science and Technology, 2025, 14(5): 2035-2042.

Figures/Tables 14

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参数	数值	参考文献
压缩机等熵效率η_c	0.8	[16]
膨胀机等熵效率η_t	0.85	[16]
泵等熵效率η_p	0.7	[16]
过热度/℃	5	[22]
过冷度/℃	5	[22]
窄点温差/℃	5	[22]
高温水箱温度/℃	140	[23]
低温水箱温度/℃	80	[23]
发电机效率η_g	0.98	[23]
机械效率η_m	0.98	[23]

城市	哈尔滨	南京	广州
尖峰电价/(CNY/kWh)	1.3549	—	1.7519
高峰电价/(CNY/kWh)	1.1358	1.3161	1.4071
平时电价/(CNY/kWh)	0.7605	0.7872	0.8390
低谷电价/(CNY/kWh)	0.4005	0.3557	0.3360

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