Operation optimization of the coaxial deep borehole heat exchanger coupled with ground source heat pump for building heating

Wang, Yaran; Wang, Yeming; You, Shijun; Zheng, Xuejing; Wei, Shen

doi:10.1016/j.applthermaleng.2022.118656

Cited by 46 publications

(6 citation statements)

References 37 publications

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“…Figure 16 shows the scheme of the new hybrid h pump. Yaran Wang et al [30] found that a coaxial deep-hole ground-source heat pump obtain more heat than other types of ground-source heat pumps. At the same time, i not necessary to be concerned about environmental pollution due to the closed wa cycle.…”

Section: Building Applications For Geothermal Pump Technologymentioning

confidence: 99%

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Research on Application and International Policy of Renewable Energy in Buildings

2023

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It has been proposed in China that the country should reach a “carbon peak” by 2030 and be “carbon neutral” by 2060. In the context of energy conservation and emission reduction, the country’s energy structure needs to be transformed to improve the technology level and more widespread consumption of renewable energy. The global renewable energy utilization situation is first analyzed in this study from the perspective of renewable energy and the buildings using it, highlighting the importance of the application of renewable energy in buildings. Secondly, from the perspective of solar energy utilization technology, ground source heat pump technology, and systems for managing energy use in buildings, the progressiveness of renewable energy applications in buildings is analyzed. The application of these technologies in buildings is demonstrated from various angles. Thirdly, the development prospect of buildings using renewable energy is discussed from the perspective of the promotion of renewable energy-powered buildings and green construction. The development prospects of buildings using renewable energy are discussed from the economic benefits of green finance, the promotion and social support of renewable energy, and the environmental benefits of green buildings. Finally, based on studies in the United States, the United Kingdom, Russia, and China, the international energy policy and development direction, as well as the evaluation criteria of green buildings, are discussed, along with an assessment system for green buildings that is complementary to the strategic agreement.

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Section: Building Applications For Geothermal Pump Technologymentioning

confidence: 99%

“…Figure 18. The relationship between the total power consumption and the flow rates in two periods and the optimization process [30].…”

Section: Building Applications For Geothermal Pump Technologymentioning

confidence: 99%

Research on Application and International Policy of Renewable Energy in Buildings

2023

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“…At present, the research and utilization of the medium and deep GSHP systems and energy storage technology are becoming more and more mature, but there are few researches on integrating them. Wei Wang [4] established the heat transfer analytical model of closed u-well heat exchanger. And the simulation modelof the whole medium and deep ground source heat pump heating system is constructed.…”

Section: Introductionmentioning

confidence: 99%

Investigation of an Office Building Geothermal Heating System Integrating Heat Pump and Energy Storage

Li,

Lu,

Zhang

et al. 2024

Preprint

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In this study, taking an office building in Xi'an city as the research object, the heat load of the office building has been simulated using DeST. The rate of heat extraction from a 2000 m closed-loop geothermal well has also been simulated using COMSOL. The influences of the mass flowrate on the heat extraction rate and the average outlet temperature have been discussed. Combined with the downhole heat exchanger model, the heat pump model, and the thermal energy storage model, an integrated numerical simulation model for office building heating is established. The model is used to investigate the influence of different energy storage ratio on the system total cost, based on which the optimal energy storage ratio is determined. The results obtained from this study provide theoretical basis for improving geothermal energy utilization.

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“…In this case, the run-time and thermal loads of BHEs can be adjust to ensure their sustainable operation. Many studies (Kerme and Fung 2020;Ma et al 2020;Wang et al 2022;Zhao et al 2017) have investigated accessible strategies for reducing thermal interactions. For instance, operating a BHE intermittently provides more time for ground thermal recharge and reduces the mean ground temperature change (Arghand et al 2021;Liu et al 2016;Ma et al 2021;Yang et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Operational strategies to alleviate thermal impacts of the large-scale borehole heat exchanger array in Beijing Daxing Airport

Ren,

Kong,

Huang

et al. 2023

Geotherm Energy

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Large-scale ground source heat pump (GSHP) systems are increasingly used for space heating and cooling. In comparison with smaller ones, large GSHP systems are often coupled with much more borehole heat exchangers (BHEs). Because of the intense thermal interactions between BHEs, they are more susceptible to significant ground temperature changes. Meanwhile, they possess the advantage that their operational strategies can be applied with a high degree of freedom, which presents chances to alleviate intense thermal interactions. In this study, we used a new performance indicator to access the effectiveness of GSHP operational strategies on alleviating thermal anomalies. The Daxing Airport GSHP system, contains 10,497 BHEs and is the largest in the world; therefore, it was selected as the test case for performance enhancement through operational strategies. We established a 2D model to predict ground temperature changes during the 50-year operation of the BHEs. First, it was revealed that the most severe thermal anomalies in the study area mainly occurred both within and between the BHE arrays, which should be mitigated. To alleviate the thermal anomalies caused by the thermal interactions of BHEs, operational strategies were applied by adjusting the cooling/heating starting sequence, setting time-dependent thermal loads, and reallocating thermal loads according to the position of the BHEs. Our study demonstrates that only the operation strategy that adjusts the cooling/heating starting sequence is beneficial for different BHE layouts, while the operational strategy that reallocates the thermal loads depending on BHEs position may be only effective for specific BHE layouts. In addition, our new performance indicator can be used to evaluate the effectiveness of the operational strategies and determine the spacing of adjacent BHE arrays. Therefore, it benefits the operation management of BHE array and design of BHE layout, and further guarantees the sustainable operation of the GSHP system.

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Operation optimization of the coaxial deep borehole heat exchanger coupled with ground source heat pump for building heating

Cited by 46 publications

References 37 publications

Research on Application and International Policy of Renewable Energy in Buildings

Research on Application and International Policy of Renewable Energy in Buildings

Investigation of an Office Building Geothermal Heating System Integrating Heat Pump and Energy Storage

Operational strategies to alleviate thermal impacts of the large-scale borehole heat exchanger array in Beijing Daxing Airport

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