Practice and Optimization of Seasonal/Daily Composite Thermal Energy Storage Technology Based on Lakes/Rivers
In the context of low/zero-carbon heating, heat pump technology has emerged as the inevitable path in the field of medium and low-temperature heating due to their high efficiency in electrical-to-thermal energy conversion. However, due to the lack of stable heat sources in northern winter, it is nec...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | zho |
| Published: |
Journal of Refrigeration Magazines Agency Co., Ltd.
2025-01-01
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| Series: | Zhileng xuebao |
| Subjects: | |
| Online Access: | http://www.zhilengxuebao.com/thesisDetails?columnId=82042200&Fpath=home&index=0 |
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| Summary: | In the context of low/zero-carbon heating, heat pump technology has emerged as the inevitable path in the field of medium and low-temperature heating due to their high efficiency in electrical-to-thermal energy conversion. However, due to the lack of stable heat sources in northern winter, it is necessary to store the heat sources within the urban area across seasons to ensure the stability of heating provided by the heat pump system. To address the current limitations of heat sources and the inadequate consideration of daily heat storage, this paper combines the seasonal/daily heat storage project of river water in the Guantao, builds a modeling and simulation platform by using TRNSYS, studies the system's long-term operation performance, and matches and optimizes the buried pipe spacing, river water flow rate, and water tank volume. The results show that after 10 years of operation, the temperature rise of the thermal storage unit reaches 3.2°C, and the heat storage efficiency rises to 98%. For the design of the thermal storage unit, under the large thermal storage unit and larger river water flow, the power consumption to obtain the same heat is smaller. For the tank design, the right tank volume and control strategy can avoid more initial investment and energy consumption. The optimized seasonal/daily thermal storage system can reduce the annual operating cost by about 28.8% compared to the seasonal thermal storage system, which has a good economic benefit. |
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| ISSN: | 0253-4339 |