Second-law thermodynamic assessment of cascaded latent-heat stores for pumped-thermal electricity storage

被引:1
|
作者
Zhao, Yao [1 ,2 ]
Xie, Yun [1 ]
Song, Jian [3 ,4 ]
Wang, Kai [5 ]
Cui, Liming [6 ]
Zhang, Hongwei [7 ]
机构
[1] Shanghai Jiao Tong Univ, Coll Smart Energy, Shanghai 200240, Peoples R China
[2] Shanghai Jiao Tong Univ, Shanghai Inst Noncarbon based Energy Convers & Uti, Shanghai 200240, Peoples R China
[3] Univ Birmingham, Birmingham Ctr Energy Storage, Birmingham B15 2TT, England
[4] Univ Birmingham, Sch Chem Engn, Birmingham B15 2TT, England
[5] Zhejiang Univ, Inst Refrigerat & Cryogen, Key Lab Refrigerat & Cryogen Technol Zhejiang Prov, Hangzhou 310027, Peoples R China
[6] China Shenhua Energy Co Ltd, CHN Energy Investment Grp, Beijing 100011, Peoples R China
[7] CHN Energy Investment Grp, Natl Inst Clean and Low Carbon Energy, Beijing 102211, Peoples R China
基金
中国国家自然科学基金;
关键词
Pumped-thermal electricity storage; Cascaded latent-heat store; Packed-bed and liquid sensible-heat stores; Second-law thermodynamic analysis; Exergy efficiency; ENERGY-STORAGE; PERFORMANCE; OPTIMIZATION; FLOW;
D O I
10.1016/j.applthermaleng.2024.125290
中图分类号
O414.1 [热力学];
学科分类号
摘要
Joule-Brayton cycle-based pumped-thermal electricity storage can develop from a pure electricity-storage function to integrated cooling, heating and power systems. Cascaded latent-heat stores are promising as thermal stores that offer flexible multi-grade heat and cold utilisation. So far, comprehensive investigations of these stores for pumped-thermal electricity storage, particularly through the lens of the second law of thermodynamics, have not been investigated comprehensively. This paper presents a model for cascaded latent-heat stores, and assesses the impacts of tube-side velocity, total stage number and stage area on the exergy performance for the entire store and individual stages. A comparative analysis highlights that the upper limit of roundtrip exergy efficiency in combined heating and power mode surpasses pure electricity-storage mode by 2.1%. Furthermore, cascaded latent-heat stores demonstrate comparable performance to packed-bed and liquid sensible-heat stores in terms of exergy metrics. Notably, in combined heating and power mode, cascaded latent-heat stores improve the upper limit of roundtrip exergy efficiency by 7.5% over packed-bed heat stores. The second-law analysis yields more refined store designs than first-law assessments.
引用
收藏
页数:12
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