Thermal storage characteristics and optimization of plate-type phase change energy storage unit

doi:10.19799/j.cnki.2095-4239.2020.0107

Abstract

Abstract:

This study investigates the energy storage performance of a plate-type phase change energy storage unit (PCESU) containing a paraffin-based phase change material. The heat transfer rate is analyzed considering the layout of the thermocouples, aspect ratio, and thickness of PCESUs. The results show that the thermocouples at measuring points accelerate the melting process. Natural convection accelerates the melting process of paraffin. The melting rate in the upper region of PCESUs is higher than that in the lower region. Affected by the buoyance force and the heat transfer area, the PCESU with an aspect ratio of 3:1 presents the fastest melting rate, whereas that with an aspect ratio of 2:3 shows the slowest melting rate. The total melting time of paraffin parabolically increases with the increasing PCESU thickness. An economic analysis shows that the PCESU with 3:1 aspect ratio and 30 mm thickness has an optimal structure.

Key words: phase change energy storage unit, natural convection, melting process, economic analysis

CLC Number:

TK 02

Lihui LIU, Yajing MO, Xiaoqin SUN, Jie LI. Thermal storage characteristics and optimization of plate-type phase change energy storage unit[J]. Energy Storage Science and Technology, 2020, 9(6): 1784-1789.

Figures/Tables 13

Table 1

Table 2

Table 3

Fig.1

Fig.2

Fig.3

Fig.4

Table 4

Fig.5

Table 5

Fig.6

Fig.7

Table 6

References 12

1	张寅平, 胡汉平, 孔祥冬, 等. 相变贮能理论和应用[M]. 合肥: 中国科学技术大学出版社, 1996: 1-5.
2	袁艳平, 向波, 曹晓玲, 等. 建筑相变储能技术研究现状与发展[J]. 西南交通大学学报, 2016, 51(3): 585-598.
	YUAN Yanping, XIANG Bo, CAO Xiaoling, et al. Research status and development on latent energy storage technology of building[J]. Journal of Southwest Jiaotong University, 2016, 51(3): 585-598.
3	张仁元. 相变材料与相变储能技术[M]. 北京: 科学出版社, 2009: 127-129.
4	KHODADADI J M, ZHANG Y. Effects of buoyancy- driven convection on melting within spherical containers[J]. International Journal of Heat & Mass Transfer, 2001, 44(8): 1605-1618.
5	SILVA P D, GONÇALVES L C, PIRES L. Transient behaviour of a latent-heat thermal energy store: numerical and experimental studies[J]. Applied Energy, 2002, 73(1): 83-98.
6	HORBANIUC B, DUMITRASCUA G, POPESCUB A. Mathematical models for the study of solidification within a longitudinally finned heat pipe latent heat thermal storage system[J]. Energy Conversion and Management, 1999, 40(15): 1765-1774.
7	VYSHAK N R, JILANI G. Numerical analysis of latent heat thermal energy storage system[J]. Energy Conversion and Management, 2007, 48(7): 2161-2168.
8	FUENTES J M, KUZNIK F K, JOHANNES K, et al. Development and validation of a new LBM-MRT hybrid model with enthalpy formulation for melting with natural convection[J]. Physics Letter A, 2014, 378(4): 374-381.
9	DHAIDAN N S, KHODADADI J M. Melting and convection of phase change materials in different shape containers: A review[J]. Renewable and Sustainable Energy Reviews, 2015, 43: 449-477.
10	KAMKARI B, SHOKOUHMAND H, BRUNO F. Experimental investigation of the effect of inclination angle on convetion-driven melting of phase change material in a rectangular enclosure[J]. International Journal of Heat and Mass Transfer, 2014, 72: 186-200.
11	SEMMA E A, GANAOUI M E, BENNACER R. Lattice Boltzmann method for melting/ solidification problems[J]. Comptes Rendus Mecanique, 2007, 335(5/6): 295-303.
12	QARNIA H E, DRAOUI A, LAKHAL E K. Computation of melting with natural convection inside a rectangular enclosure heated by discrete protruding heat sources[J]. Applied Mathematical Modelling, 2013, 37(6): 3968-3981.

宽高比	1∶3	2∶3	3∶3	3∶2	3∶1
宽	115	163	200	245	345
高	365	265	220	183	135
厚	20	20	20	20	20

宽高比	热电偶	1∶3	2∶3	3∶3	3∶2	3∶1
A组熔化历时/min	有	210	230	220	210	190
B组熔化历时/min	无	220	250	230	225	200

编号	C1	C2	C3	C4
宽/mm	345	283	245	220
高/mm	135	114	102	93
厚/mm	20	30	40	50

厚度/mm	相变材料(石蜡)		相变单元外壳(亚克力板)
厚度/mm	熔化时长/min	熔化速率/W	表面积/10⁴mm2	成本/元·个^-1
20	200	12.18	11.23	22.47
30	212	11.79	8.83	17.67
40	220	11.07	7.77	15.55
50	242	10.06	7.22	14.44

[1]	ZHANG Ping, KANG Libin, WANG Mingju, ZHAO Guang, LUO Zhenhua, TANG Kun, LU Yaxiang, HU Yongsheng. Technology feasibility and economic analysis of Na-ion battery energy storage [J]. Energy Storage Science and Technology, 2022, 11(6): 1892-1901.
[2]	Yongxue ZHANG, Zixi WANG, Bohui LU, Shengqi YANG, Hongyu ZHAO. Enhancement of charging and discharging performance of a latent-heat thermal-energy storage unit using snowflake-shaped fins [J]. Energy Storage Science and Technology, 2022, 11(2): 521-530.
[3]	Huihui YANG, Li ZENG, Bo TANG, Xiaoqing WANG, Yong LU. Experimental study on an EG/paraffin composite thermal storage material and its feasibility for off-peak power heating utilization [J]. Energy Storage Science and Technology, 2022, 11(1): 19-29.
[4]	Dekun FU, Wenji SONG, Mingbiao CHEN, Ziping FENG. Techno-economic analysis of seasonal cold storage technology and its application in protected agriculture [J]. Energy Storage Science and Technology, 2021, 10(6): 2385-2391.
[5]	Qihui YU, Li TIAN, Xiaofei LI, Xiaodong LI, Xin TAN, Yeming ZHANG. Compressed air energy storage capacity configuration and economic evaluation considering the uncertainty of wind energy [J]. Energy Storage Science and Technology, 2021, 10(5): 1614-1623.
[6]	Lei HOU, Zichi WANG, Yingchao LI, Saihao WANG, Yajie ZHANG, Yusen ZHANG. Analysis and multi-objective optimization of CAES system [J]. Energy Storage Science and Technology, 2021, 10(1): 379-384.
[7]	Tingting DENG, Yingling CAI. Effect of expanded graphite on the melting and solidification of paraffin in cage-drawer water tank [J]. Energy Storage Science and Technology, 2021, 10(1): 190-197.
[8]	Yiqian GAO, Yi LIU, Ling LI. Numerical simulation of natural convection melting inside a triangular cavity using Lattice Boltzmann method [J]. Energy Storage Science and Technology, 2020, 9(6): 1798-1805.
[9]	ZHOU Huilin, QIU Yan. Heat storage characteristic and structure optimum inrectangular unit [J]. Energy Storage Science and Technology, 2020, 9(4): 1082-1090.
[10]	FAN Yongsheng, ZHAO Lulu, LIU Qinghua, LEMMON John, MIAO Ping. Economic analysis of flow battery energy storage for wind farm application [J]. Energy Storage Science and Technology, 2020, 9(3): 725-729.
[11]	ZOU Yong, QIU Rudong, WANG Xia. Simulation study on thermal storage process of paraffin phase change materials [J]. Energy Storage Science and Technology, 2020, 9(1): 101-108.
[12]	XING Zuoxia, ZHAO Haichuan, MA Shiping, DAI Junwen, LIU Yuting, SUN Zhenting. Study on key parameters design and economic evaluation of the electric heating and solid sensible heat thermal storage device [J]. Energy Storage Science and Technology, 2019, 8(6): 1211-1216.
[13]	YANG Zhishun, CHEN Lihua, XIA Zhenhua. Numerical investigation of the thermal mechanism of the solid-liquid phase changing process [J]. Energy Storage Science and Technology, 2019, 8(6): 1217-1223.
[14]	LIN Junhao, GU Xiongwen, MA Li. Optimal sizing and control of demand-side battery energy storage system [J]. Energy Storage Science and Technology, 2018, 7(1): 90-.
[15]	YUAN Shuangchen1, CAI Shengxia2, WANG Shouxiang1, HUANG Bibin3. Economic modeling and analysis of user-side electrical/thermal comprehensive energy storage system [J]. Energy Storage Science and Technology, 2017, 6(5): 1099-1104.