Preliminary storage performance of a seasonal energy storage system in Shanghai
Seasonal thermal energy storage is one of the achievable and essential ways in which utmost solar energy can be utilized despite of its time-discrepancy between energy supply and consumption.In this paper,a demonstration project of seasonal underground solar energy storage system in Shanghai,China is reported.The system consists of three sub-systems: solar collection subsystem,thermal energy storage subsystem and heating subsystem.It is designed to deliver heat obtained from solar energy to the greenhouse plants instead of using conventional gas boiler that consumes fossil fuel.In this project,solar heat captured in 500 m2 of evacuated tube collectors during the non-heating season is charged into approximately 4970 m3 of soil right under the greenhouse.When space heating is required in low-temperature season,the stored energy can be retrieved via U-tube heat exchangers.The system has been put into operation since April,2012 and being monitored onwards.Preliminary performance of the system during the first year charging process(Apr.-Nov.,2012)is presented and analyzed.Underground soil temperature reached 37 oC at the end of November and 331.9 GJ out of 757 GJ collected heat was stored in the soil mass.The storage efficiency was about 44%in the first year of operation since a large amount of heat was consumed by heating up the surrounding soil mass from its initial low temperature.Thermal performance of the charging loop is evaluated and control strategy to optimize the storing process is proposed.The storage performance evaluated in this paper can be a good reference for design and control the seasonal storage system in the weather condition of south east China.
Seasonal heat storage Underground thermal energy storage Solar energy Space heating Sustainability
Jing Xu Yong Li Ruzhu Wang Wei Liu
Institute of Refrigeration and Cryogenics,Key Laboratory of Power Machinery and Engineering of Ministry of Education,Shanghai Jiao Tong University,Shanghai 200240,China
国际会议
桂林
英文
1-12
2013-07-16（万方平台首次上网日期，不代表论文的发表时间）