Thermodynamic cycle design of steam Carnot battery based on phase change material

doi:10.3785/j.issn.1008-973X.2024.01.017

Journal of ZheJiang University (Engineering Science)

2024, Vol. 58

Issue (1): 161-168 DOI: 10.3785/j.issn.1008-973X.2024.01.017

Thermodynamic cycle design of steam Carnot battery based on phase change material

Xiaojie LIN1,2(

),Jiahao XU1,2,Peng SUN3,Wei ZHONG2,*(

),Yacai HU2

1. College of Energy Engineering, Zhejiang University, Hangzhou 310027, China
2. Jiaxing Research Institute, Zhejiang University, Jiaxing 314024, China
3. Polytechnic Institute, Zhejiang University, Hangzhou 310015, China

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Abstract

A new steam Carnot battery based on high-temperature and low-temperature phase change materials was proposed in order to analyze the new route of multi-energy complementation of integrated energy system in industrial parks. A thermodynamic cycle calculation model considering the equipment performance and mass flow rate was established. The effects of design parameters and multi-stage compression structure on the system heat pump coefficient, round-trip efficiency, power storage loss and efficiency of the heating were analyzed. The phase change temperature of low-temperature phase change material and the phase change temperature of high-temperature phase change material are the main factors affecting the performance of steam Carnot battery. The high cycle performance region of steam Carnot battery was obtained. The parameters and structure of the steam Carnot battery were optimized. Results showed that the round-trip efficiency could reach 56.96%, the coefficient of performance of the heat pump could reach 2.55, and the efficiency of the heating could reach 68.74%.

Key words： Carnot battery energy storage thermodynamic analysis steam production waste heat utilization

Received: 02 March 2023 Published: 07 November 2023

CLC:

TK 219

Fund: 国家自然科学基金资助项目（51806190）；国家重点研发计划资助项目（2019YFE0126000）

Corresponding Authors: Wei ZHONG E-mail: xiaojie.lin@zju.edu.cn;zhongw@zju.edu.cn

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Cite this article:

Xiaojie LIN,Jiahao XU,Peng SUN,Wei ZHONG,Yacai HU. Thermodynamic cycle design of steam Carnot battery based on phase change material. Journal of ZheJiang University (Engineering Science), 2024, 58(1): 161-168.

URL:

https://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2024.01.017 OR https://www.zjujournals.com/eng/Y2024/V58/I1/161

基于相变材料的蒸汽卡诺电池热力学循环设计

为了研究工业园区综合能源系统的多能互补新路线，提出基于高低温相变材料的新型蒸汽卡诺电池. 建立计及设备性能与质量流量的热力学循环计算模型，分析设计参数、多级压缩结构对系统热泵系数、循环效率、储电损失与供热?效率的影响. 通过探究发现，低温相变材料的相变温度和高温相变材料的相变温度是影响蒸汽卡诺电池性能的主要因素，得到蒸汽卡诺电池的高循环性能区. 优化蒸汽卡诺电池的参数与结构，结果表明，循环效率可达56.96%，热泵系数可达2.55，供热?效率可达68.74%.

关键词： 卡诺电池, 储能, 热力学分析, 蒸汽生产, 余热利用

Fig.1 Structure and charging/discharging process of steam Carnot battery

Fig.2 Temperature-entropy diagram of thermodynamic cycle of steam Carnot battery

Fig.3 Influence of low-temperature phase change material temperature on performance of steam Carnot battery

Fig.4 Relationship between low-temperature losses, steam compressor power consumption and low temperature phase change material’s temperature

Fig.5 Influence of high-temperature phase change material temperature on performance of steam Carnot battery

Fig.6 Relationship between low-temperature losses, steam compressor power consumption and high-temperature phase change material’s temperature

Fig.7 Influence of adiabatic efficiency of compressor on performance of steam Carnot battery

Fig.8 Influence of adiabatic efficiency of turbine on performance of steam Carnot battery

Fig.9 Influence of high-temperature and low-temperature phase change material’s temperature on performance of steam Carnot battery

Fig.10 Influence of compression stages number and high temperature phase change material’s temperature on round-trip efficiency of steam Carnot battery

Fig.11 Influence of compression stages number and high temperature phase change material’s temperature on heat pump coefficient of steam Carnot battery

Fig.12 Influence of compression stages number and high temperature phase change material’s temperature on heating exergy efficiency of steam Carnot battery


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