Numerical and experimental study of an underground water pit for seasonal heat storage

doi:10.1016/j.renene.2019.12.080

	Numerical and experimental study of an underground water pit for seasonal heat storage
	Bai, Yakai 1,2,3,5,6,7,8; Wang, Zhifeng 1,2,3,5,6,7; Fan, Jianhua 8; Yang, Ming 1,2,3,5,6,7; Li, Xiaoxia 1,2,3,4,5,6; Chen, Longfei 1,2,3,4,5,6; Yuan, Guofeng 1,2,3,5,6,7; Yang, Junfeng 1,2,3,5,6,7
	2020-05-01
关键词	District heating Enthalpy Groundwater Heat losses Heat storage Renewable energy resources Thermal stratificationDistrict heating system Finite difference model Heat loss coefficients Numerical and experimental study Numerical validations Renewable energy source Seasonal heat storages Temperature differences
卷号	150
DOI	10.1016/j.renene.2019.12.080
页码	487-508
英文摘要	Water pit heat storage is an important part of smart district heating systems that integrate various renewable energy sources. This project studied the storage capacity and thermal stratification in a 3000 m3 underground water pit in Huangdicheng, China using a finite difference model of the water pit that was validated by experimental data. The total heat loss from the water pit in the first year was measured to be 98 MWh and the storage efficiency was 62%. Further investigations using the validated model show that approximately 57% of the total heat loss took place through the side wall, 30% through the top and the rest through the bottom of the pit. The heat loss coefficient was largest along the side wall at 0.702 W m−2oC−1. Higher charging temperatures create higher temperature differences between the top and bottom of the water pit, i.e. greater thermal stratification. The MIX number increases during most of the charging period and cannot represent the thermal stratification in the water pit during charging while the stratification number more accurately represents the stratification. Therefore, the stratification number is recommended for characterizing stratified water pits. © 2019 Elsevier Ltd
会议录	Renewable Energy
会议录出版者	Elsevier Ltd
语种	英语
ISSN号	09601481
WOS研究方向	Science & Technology - Other Topics ; Energy & Fuels
WOS记录号	WOS:000518874500041
内容类型	会议论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/132722]
专题	能源与动力工程学院
作者单位	1.Beijing Engineering Research Center of Solar Thermal Power, Beijing; 100190, China; 2.Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing; 100190, China; 3.Key Laboratory of Solar Thermal Energy and Photovoltaic Systems, Chinese Academy of Sciences, Beijing; 100190, China; 4.Lanzhou University of Technology, Lanzhou; 730050, China 5.Joint Laboratory, Institute of Electrical Engineering, Chinese Academy of Sciences and Guangdong Five Star Solar Energy Co., Ltd., Beijing; 100190, China; 6.Beijing CSP International Cooperation Centre, Beijing; 100190, China; 7.University of Chinese Academy of Sciences, Beijing; 100049, China; 8.Department of Civil Engineering, Technical University of Denmark, Brovej 118, Kgs. Lyngby; 2800, Denmark;
推荐引用方式 GB/T 7714	Bai, Yakai,Wang, Zhifeng,Fan, Jianhua,et al. Numerical and experimental study of an underground water pit for seasonal heat storage[C]. 见:.