期刊
SUSTAINABLE CITIES AND SOCIETY
卷 38, 期 -, 页码 370-381出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.scs.2018.01.014
关键词
Underground space; Mine refuge chamber; Thermal energy storage; Cavern envelope; Intermittent operation; Optimization
资金
- National Natural Science Foundation of China [51378426]
- Youth Science and Technology Innovation Team of Sichuan Province of Building Environment and Energy Efficiency [2015TD0015]
- National Natural Science Foundation of China
- Royal Society International Exchange Program [5141101198]
- EPSRC [EP/M507830/1] Funding Source: UKRI
The coupled cooling method combining latent heat thermal energy storage and pre-cooling of the envelope (PE) is a new free-cooling method that is suitable for exposure to high temperatures and other types of harsh environments. PE plays the most critical role in the coupled cooling method. Long-term, continuous PE cannot only reduce energy storage capacity, but it also causes numerous energy waste. Thus, an intermittent operational mode is firstly proposed to improve the heat transfer performance and reduce energy consumption. A simplified numerical model of intermittent thermal storage is established, and the subsequent effects of intermittent ratio (IR) and intermittent period (IP) on cold storage performance have been systematically investigated. Furthermore, the operational period is divided into a cold storage period (CSP) and a cold preservation period (CPP), each with their own respective evaluation indices. Long-term intermittent PE is optimized, and an interchanging continuous/intermittent cold storage strategy is proposed. Under the current operating conditions, as compared with the conventional continuous mode, the duration of CSP is extended by 0-26%, yielding an annual cold storage energy consumption reduction of 68-78%. Thus, the current study demonstrates the significant potential of intermittent operational mode application in underground thermal energy storage systems.
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