Thermo-economic assessment of sub-ambient temperature pumped-thermal electricity storage integrated with external heat sources

被引：29

作者：

Iqbal, Qasir ^{[1
]}

Fang, Song ^{[1
]}

Zhao, Yao ^{[2
]}

Yao, Yubo ^{[1
]}

Xu, Zhuoren ^{[1
]}

Gan, Haoran ^{[1
]}

Zhang, Hanwei ^{[1
]}

Qiu, Limin ^{[1
]}

Markides, Christos N. ^{[3
]}

Wang, Kai ^{[1
]}

机构：

[1] Zhejiang Univ, Inst Refrigerat & Cryogen, Key Lab Refrigerat & Cryogen Technol Zhejiang Prov, Hangzhou 310027, Peoples R China

[2] Shanghai Jiao Tong Univ, Coll Smart Energy, Shanghai 200240, Peoples R China

[3] Imperial Coll London, Dept Chem Engn, Clean Energy Proc CEP Lab, South Kensington Campus, London SW7 2AZ, England

来源：

ENERGY CONVERSION AND MANAGEMENT | 2023年 / 285卷

基金：

中国国家自然科学基金; 英国工程与自然科学研究理事会; 欧盟地平线“2020”;

关键词：

Sub; -ambient; Pumped -thermal energy storage; Thermal integration; Carnot battery; Levelized cost of storage; Energy storage capacity; ENERGY-STORAGE; SYSTEM; COST; TECHNOLOGY; SOLAR; PTES;

D O I：

10.1016/j.enconman.2023.116987

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Thermally integrated pumped-thermal electricity storage (TI-PTES) offers the opportunity to store electricity as thermal exergy at a large scale, and existing studies are primarily focused on TI-PTES systems based on high -temperature thermal energy storage. This paper presents a thermo-economic analysis of a "cold TI-PTES" sys-tem which converts electricity into cold energy using a vapor compression refrigeration (VCR) unit and stores it at sub-ambient temperatures during the charging process, and generates electricity by using an organic Rankine cycle (ORC) working between the sub-ambient temperature and an external low-grade heat source during the discharging process. The effects of key parameters, i.e., mass flowrate and temperature of the storage medium, ORC evaporation temperature, component efficiencies, and pinch-point temperature differences, on the system performance are evaluated based on a whole-system thermo-economic model. The results reveal that the roundtrip efficiency and levelized cost of storage (LCOS) of the system increases while the electrical energy storage capacity decreases as the temperatures of the two cold storage tanks approach each other. When the temperature of the cold storage tank 1 rises from 1 degrees C to 8 degrees C while the cold storage tank 2 remains as 13 degrees C, there is an increase of 25% and 20% in the roundtrip efficiency and LCOS respectively while the energy storage capacity decreases by 69%. A roundtrip efficiency of 0.74 and LCOS of 0.32 $/kWh are achieved with a heat source temperature of 85 degrees C, using a mass flowrate and temperature of the cold storage medium of 50 kg/s and 1 degrees C. Furthermore, any change in cold storage medium mass flowrate changes both electrical energy storage capacity and power output by the same proportions. With a continuous high-flowrate external heat source, the LCOS can be as low as 0.17 $/kWh. By providing sufficient heat from an external heat source, the proposed system possesses a high potential for medium-to-large scale energy storage with a unique hybrid nature for electricity storage and thermal integration.

引用

页数：14