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http://dx.doi.org/10.5762/KAIS.2019.20.1.28

Optimal Operation Methods of the Seasonal Solar Borehole Thermal Energy Storage System for Heating of a Greenhouse  

Kim, Wonuk (Green Building Research Center, Department of Living and Built Environment Research, Korea Institute of Civil Engineering and Building Technology (KICT))
Kim, Yong-Ki (Green Building Research Center, Department of Living and Built Environment Research, Korea Institute of Civil Engineering and Building Technology (KICT))
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.20, no.1, 2019 , pp. 28-34 More about this Journal
Abstract
Solar energy is one of the most abundant renewable energy sources on Earth but there are restrictions on the use of solar thermal energy due to the time-discrepancy between the solar-rich season and heating demand. In Europe and Canada, a seasonal solar thermal energy storage (SSTES), which stores the abundant solar heat in the summer and uses the heat for the winter heating load, is used. Recently, SSTES has been introduced in Korea and empirical studies are actively underway. In this study, a $2,000m^2$ flat plate type solar collector and $20,000m^2$ of borehole thermal energy storage (BTES) were studied for a greenhouse in Hwaseong City, which has a heating load of 2,164 GJ/year. To predict the dynamic performance of the system over time, it was simulated using the TRNSYS 18 program, and the solar fraction of the system with the control conditions was investigated. As a result, the solar BTES system proposed in this study showed an average solar fraction of approximately 60% for 5 years when differential temperature control was applied to both collecting solar thermal energy and discharging BTES. The proposed system simplified the configuration and control method of the solar BTES system and secured its performance.
Keywords
Solar Energy; BTES(Borehole Thermal Energy Storage); SSTES(Seasonal Solar Thermal Energy Storage); Differential temperature control; Solar fraction; Greenhouse;
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