跨季节复合储热系统储/释热特性

doi:10.19799/j.cnki.2095-4239.2020.0101

储能科学与技术 ›› 2020, Vol. 9 ›› Issue (6): 1837-1846.doi: 10.19799/j.cnki.2095-4239.2020.0101

跨季节复合储热系统储/释热特性

王子逸^1,²(), 徐玉杰^1,², 周学志^1,^2,³, 陈海生^1,^2,³(), 盛勇¹, 徐德厚³, 令狐友强³, 丁捷^1,²

^1.中国科学院工程热物理研究所，北京 100190
^2.中国科学院大学，北京 100049
^3.国家能源大规模物理储能技术（毕节）研发中心，贵州毕节 551700

收稿日期:2020-03-10 修回日期:2020-04-07 出版日期:2020-11-05 发布日期:2020-10-28
通讯作者: 陈海生 E-mail:wangziyi@iet.cn;chen_hs@iet.cn
作者简介:王子逸(1994—)，男，硕士研究生，主要从事大规模物理储热研究，E-mail：wangziyi@iet.cn。
基金资助:
国家重点研发计划(2017YFB0903605);北京市自然科学基金项目(3182040);贵州省科技基金计划项目([2017]1163);中科院洁净能源先导科技专项(XDA21070302);中国科学院前沿科学重点研究项目(QYZDB-SSW-JSC023);国家自然科学基金青年科学基金项

Storage and release characteristics of seasonal composite thermal storage system

Ziyi WANG^1,²(), Yujie XU^1,², Xuezhi ZHOU^1,^2,³, Haisheng CHEN^1,^2,³(), Young SHENG¹, Dehou XU³, Youqiang LINGHU³, Jie DING^1,²

^1.Institute of Engineering Thermophysics, Chinese Academy of Science, Beijing 100190, China
^2.University of Chinese Academy of Science, Beijing 100049, China
^3.National Energy Large Scale Physical Energy Storage Technologies R&D Center(Bijie), Bijie 551712, Guizhou, China

Received:2020-03-10 Revised:2020-04-07 Online:2020-11-05 Published:2020-10-28
Contact: Haisheng CHEN E-mail:wangziyi@iet.cn;chen_hs@iet.cn

摘要/Abstract

摘要：

太阳能等可再生能源具有间歇性和不稳定性等特点，导致其在供给侧和需求侧存在时间、空间和强度上的不匹配特性和季节性，跨季节储热技术是解决上述问题的最有效方法之一。然而传统的跨季节储热系统存在热损失大、系统效率低等问题。为了解决上述问题，本文提出了由地埋管储热和水箱储热相耦合的新型复合储热系统，采用实验研究和数值计算的方法对该复合储热系统储释热特性和耦合储热体温度场变化规律开展研究。结果表明，该新型复合储热系统技术上是可行的，两种储热方式互为补充、互为协调，热量损失小，系统能效高，效率达67.29%，且耦合储热体温度场相互叠加，更有利于热量的高效存储与释放。此外，复合储热系统经过储热、保温、释热和恢复四个阶段后，耦合储热体温位水平升高，更有利于系统多年运行。本研究有助于拓展和完善地下跨季节储热系统能量传输和传热控制理论，为进一步拓展应用提供理论指导依据。

关键词: 储热技术, 跨季节储热, 储/释热特性, 热量损失

Abstract:

Renewable energy sources, such as solar energy, have the characteristics of intermittence and instability that lead to their temporal, spatial, and intensity mismatch and seasonal characteristics. The seasonal thermal storage technology is one of the most effective solutions for these problems, but the traditional seasonal thermal storage system encounters problems of large heat loss and low system efficiency. To solve these problems, this study proposes a new type of composite thermal storage system coupled with an underground borehole storage and a water tank thermal storage. This system uses Fluent simulation software to perform research on the thermal storage and release characteristics of the composite thermal storage system and the change law of the temperature field of the thermal storage body. The results show that the new composite thermal storage system is technically feasible with a 67.29% system efficiency. The two thermal storage methods are complementary and coordinate with each other. The temperature fields of the coupled thermal storage bodies are superimposed on each other, thereby showing a significant temperature delay, and are more conducive to the thermal storage and release. In addition, after one operating cycle of the composite thermal storage system, the temperature level of the coupled thermal storage body increases, which is conducive to the system operation for many years. This research will be helpful in expanding and improving the energy transmission and heat transfer control theory of the underground seasonal thermal storage system and provide theoretical guidance for further expansion and application.

Key words: thermal storage technology, seasonal thermal storage, thermal storage/release characteristics, heat loss

中图分类号:

TK 52

王子逸, 徐玉杰, 周学志, 陈海生, 盛勇, 徐德厚, 令狐友强, 丁捷. 跨季节复合储热系统储/释热特性[J]. 储能科学与技术, 2020, 9(6): 1837-1846.

Ziyi WANG, Yujie XU, Xuezhi ZHOU, Haisheng CHEN, Young SHENG, Dehou XU, Youqiang LINGHU, Jie DING. Storage and release characteristics of seasonal composite thermal storage system[J]. Energy Storage Science and Technology, 2020, 9(6): 1837-1846.

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网格编号	1	2	3
网格总数/万	24.2	30.8	35.6
释热量/MJ	1011	1035	1044

参数	取值
土壤导热系数/W·(m·k)^-1	1.9
土壤密度/kg·m^-3	2000
土壤比热容/J·(kg·k)^-1	700
U型管导热系数/W·(m·k)^-1	0.44
U型管密度/kg·m^-3	950
U型管比热容/J·(kg·k)^-1	2300
水箱导热系数/W·(m·k)^-1	59.41
水箱密度/(kg·m^-3)	7860
水箱比热容/J·(kg·k)^-1	468.61
水导热系数/W·(m·k)^-1	0.6
水的密度/kg·m^-3	998
水比热容/J·(kg·k)^-1	4182
水的黏度/N·s·m^-2	0.001

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跨季节复合储热系统储/释热特性

Storage and release characteristics of seasonal composite thermal storage system

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