Performance enhancement of thermal-integrated Carnot battery through zeotropic mixtures

Tong Zhou, Lingfeng Shi, Xiaocun Sun, Meiyan Zhang, Yonghao Zhang, Yu Yao, Zhonghong Pan, Quangan Hu, Zhuorui Jiang, Hua Tian and Gequn Shu

Energy, 2024, vol. 311, issue C

Abstract: Pumped Thermal Energy Storage (PTES), known as one of the branches of Carnot battery, is a promising large-scale physical energy storage technology for its cheap cost and potentiality in absorbing fluctuating and intermittent renewable and utilizing waste heat widely distributed in various scenarios. Due to the match between the critical thermodynamic properties and the thermal storage temperature range, R1233zd(E) is regarded as the suitable choice. Besides, appropriate mixture choices are widely known for excellent thermal match processes, which reduce exergy losses and further enhance power-to-power efficiency. Thus, the optimization methods, processes, and results of various Pumped Thermal Energy Storage configurations are discussed in detail. Results show that for the different configurations, R1233zd(E)-based mixtures can maximum achieve improvements in power-to-power efficiency of 31.94 %, 33.16 %, and 43.46 % compared to R1233zd(E) when the high-temperature thermal storage temperature is 120 °C. When the PR-PTES operating temperature is 90–75 °C, the maximum power-to-power efficiency reaches 81.26 % Also, the PR-PTES is regarded as the most suitable configuration. In general, R1233zd(E)/R134a, R1233zd(E)/R152a, and R1233zd(E)/R1234yf are considered to be the better choice for working fluids.

Keywords: Carnot battery; Pumped thermal energy storage; Waste heat recovery; R1233zd(E)-based mixture; Efficiency improving (search for similar items in EconPapers)
Date: 2024
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:311:y:2024:i:c:s0360544224031049

DOI: 10.1016/j.energy.2024.133328

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