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A novel solar-assisted ground-source heat pump (SAGSHP) with seasonal heat-storage and heat cascade utilization: Field test and performance analysis

Sun, Tingting, Yang, Lingyan, Jin, Lu, Luo, Zhiwen ORCID: https://orcid.org/0000-0002-2082-3958, Zhang, Yan, Liu, Yanzhu and Wang, Zhengru 2020. A novel solar-assisted ground-source heat pump (SAGSHP) with seasonal heat-storage and heat cascade utilization: Field test and performance analysis. Solar Energy 201 , pp. 362-372. 10.1016/j.solener.2020.03.030

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Abstract

To maintain the energy quality with high temperature and reduce the energy loss of seasonal heat-storage in solar-assisted ground-source heat pumps (SAGSHPs), a novel SAGSHP system with the heat-cascading of borehole heat-exchangers was designed and its field-test was conducted in this paper. The borehole heat-exchangers were divided into two regions: the core region and the peripheral region. The core region can maintain a high temperature (e.g. 45 °C), which is much higher than in previous studies, and the heat from this region can be used directly, without the operation of a heat pump. A field-test was conducted in a community in the province Shandong, China. The results indicate that a sufficient soil-temperature gradient (the temperature is high in the core but low at the periphery) can be created and maintained. The monthly averaged borehole-wall-temperature difference between the borehole heat-exchangers (BHEs) at the core and the periphery can be as high as 30.1 °C. This means that both cascaded heat-storage and heat-utilization can be realized. In addition, an average performance of CCOP = 5.15 and SCOP = 4.66 can be achieved. Compared with previous studies, despite the lower CCOP, a higher SCOP can be attained, thanks to heat cascade storage and -utilization. The novel approach described in this paper represents a viable alternative for space heating in North China.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Architecture
Publisher: Elsevier
ISSN: 0038-092X
Date of Acceptance: 9 March 2020
Last Modified: 10 Nov 2022 11:44
URI: https://orca.cardiff.ac.uk/id/eprint/151646

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