Performance evaluation before and after solar seasonal storage coupled with ground source heat pump

Zhu, Neng; Wang, Jingmei; Liu, Long

doi:10.1016/j.enconman.2015.07.037

Cited by 66 publications

(13 citation statements)

References 23 publications

(24 reference statements)

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“…(2012) conducted a TRNSYS simulation using this strategy and found that the SCOP could be improved by as much as 26.3 % compared to a standalone ground-source heat-pump. In addition, the average ground-soil temperature increased by 0.21 ℃ each year instead of the expected decrease, according the experimental study by Zhu et al (2015).…”

Section: Introductionmentioning

confidence: 85%

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

et al. 2020

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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 ℃), 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. The 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 heatexchangers (BHEs) at the core and the periphery can be as high as 30.1 ℃. 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 andutilization. The novel approach described in this paper represents a viable alternative for space heating in North China.

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Section: Introductionmentioning

confidence: 85%

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

et al. 2020

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“…15 A second approach has been to investigate hybrid GSHP systems, 16 using auxiliary energy sources such as solar, 17 air, 13 cooling tower 18,19 and waste water. 20 Finally, a third approach has been to optimize the operation strategy, improving upon existing GHE diurnal, 10 seasonal 21 and intermittent operational 22 approaches. The methods above have improved the GSHP performance to some extent, but additional gains are needed.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on heat transfer of soil with different moisture contents and seepage for ground source heat pump

Wang

Yang

et al. 2020

Indoor and Built Environment

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Geothermal energy is a renewable energy source for heating, ventilating and air-conditioning (HVAC) systems, and is leveraged by ground heat exchanger (GHE) which is a key element of ground source heat pump (GSHP). The performance of GHE is significantly affected by soil thermal properties. To explore the heat transfer characteristics of soils with different moisture contents (MC) and seepage, a well-controlled sandbox was established and a series of experiments were performed. The results demonstrated that the soil with higher MC had stronger heat dissipation capacity, especially when seepage occurred. The temperature sensor 25 cm from the sandbox-centre detected temperature changes at the 452nd, 206th and 297th min under dry, unsaturated and saturated conditions, respectively. Moreover, the dominant mode of heat transfer in soils with different MCs was conduction, and the elevated heat-releasing rate enhanced heat propagation by moisture transfer. Furthermore, the size of the thermally affected zone was proportional to the thermal diffusivity, which was 2.14 × 10−7, 5.18 × 10−7 and 4.74 × 10−7 m2/s under dry, unsaturated and saturated conditions, respectively. Overall, these results indicate that the MC is a critical factor in characterizing soil heat transfer. This study provides guidance in choosing the installation environment for GHE and confirms the importance of matching soil characteristics with the GHE load.

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“…Yang investigated the performance of a solar-ground source heat pump system and found that the daytime water tank heat storage mode is particularly suited to buildings with a large shortterm heat load during the night [8]. Zhu combined a seasonal HSEU with a ground air source heat pump, and found that the solar seasonal storage process can significantly improve the COP of a GSHP system [9]. Jradi investigated the performance of a soil-based thermal energy storage system, and stated that the efficient energy storage techniques must be introduced to bridge the energy production-consumption gap and hence eliminate the mismatch between energy generation and demand [10].…”

Section: Introductionmentioning

confidence: 99%

Operational performance of a novel fast-responsive heat storage/exchanging unit (HSEU) for solar heating systems

Fan

Zhao

et al. 2020

Renewable Energy

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Performance evaluation before and after solar seasonal storage coupled with ground source heat pump

Cited by 66 publications

References 23 publications

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

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

Experimental study on heat transfer of soil with different moisture contents and seepage for ground source heat pump

Operational performance of a novel fast-responsive heat storage/exchanging unit (HSEU) for solar heating systems

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