Influence of geometry on the thermal performance of water pit seasonal heat storages for solar district heating

doi:10.1007/s12273-020-0671-9

	Influence of geometry on the thermal performance of water pit seasonal heat storages for solar district heating
	Bai, Yakai 1,4,5,6; Yang, Ming 3,4,5; Fan, Jianhua 1; Li, Xiaoxia 2; Chen, Longfei 4; Yuan, Guofeng 3,4,5; Wang, Zhifeng 3,4,5,6
刊名	Building Simulation
	2021-06-01
卷号	14 期号:3 页码:579-599
关键词	Digital storage District heating Heat storage Thermal stratification Coordinate transformation methods Design optimization Different heights Height-to-diameter ratio Seasonal heat storages Steady-state operation Storage efficiency Thermal Performance
ISSN号	19963599
DOI	10.1007/s12273-020-0671-9
英文摘要	The aim of the study is to investigate the influence of geometry on the thermal capacity and stratifications of a water pit heat storage for solar district heating. A TRNSYS component model for a truncated cone water pit was developed based on the coordinate transformation method and validated by experimental results from the water pit heat storage in Huangdicheng in 2018. The thermal performance of 26 water pits with different heights and side wall slopes was calculated for 10 consecutive years. It takes four to six years for the water pit to reach steady-state operation. The operation data from the tenth year was selected to evaluate the thermal performance of each configuration. The results show that because of the thermal insulation on top of the water pit, the height to diameter ratio of a water pit with minimum annual heat loss was always smaller than 1.0. The annual storage efficiency of a water pit increases with side wall slope due to the reduced side wall area. There is an almost linear increase in the thermal stratification number of a water pit with height. With an increase in the height, thermal stratification in water pits with a steeper slope increased more gradually than water pits with a lower slope. The findings in this paper are relevant for the design optimization of water pits as seasonal thermal energy storages. © 2020, Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature.
WOS研究方向	Thermodynamics ; Construction & Building Technology
语种	英语
出版者	Tsinghua University
WOS记录号	WOS:000568024600001
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/147174]
专题	能源与动力工程学院
作者单位	1.Department of Civil Engineering, Technical University of Denmark, Brovej 118, Kgs. Lyngby; 2800, Denmark; 2.Lanzhou University of Technology, Gansu; 730050, China 3.Joint Laboratory, Institute of Electrical Engineering, Chinese Academy of Sciences and Guangdong Five Star Solar Energy Co., Ltd., Beijing; 100190, China; 4.Key Laboratory of Solar Thermal Energy and Photovoltaic Systems, Chinese Academy of Sciences, Beijing; 100190, China; 5.Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing; 100190, China; 6.University of Chinese Academy of Sciences, Beijing; 100049, China;
推荐引用方式 GB/T 7714	Bai, Yakai,Yang, Ming,Fan, Jianhua,et al. Influence of geometry on the thermal performance of water pit seasonal heat storages for solar district heating[J]. Building Simulation,2021,14(3):579-599.
APA	Bai, Yakai.,Yang, Ming.,Fan, Jianhua.,Li, Xiaoxia.,Chen, Longfei.,...&Wang, Zhifeng.(2021).Influence of geometry on the thermal performance of water pit seasonal heat storages for solar district heating.Building Simulation,14(3),579-599.
MLA	Bai, Yakai,et al."Influence of geometry on the thermal performance of water pit seasonal heat storages for solar district heating".Building Simulation 14.3(2021):579-599.