Heat transfer performance of buried extremely long ground-coupled heat exchangers with concentric pipes

Jia, G.S.; Chai, John C.; Zhou, Cong; Zhao, Min; Tao, Zeyu; Zhang, Lianying; Yang, Xiaohu; Meng, Xiangzhao; Jin, Liwen

doi:10.1016/j.egypro.2017.12.656

Cited by 11 publications

(2 citation statements)

References 4 publications

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“…The test results were compared to the simulation results obtained using the fast FVM numerical simulating methods proposed in our previous work [13,14]. The operation starts on December 12, 2020 and ends on December 23, 2020.…”

Section: Field Test Results and Numerical Scheme Validationmentioning

confidence: 99%

A case study on long-term performance optimization of a geothermal heating system

Jia

Duan²,

Xue

et al. 2022

IOP Conf. Ser.: Earth Environ. Sci.

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The optimal use of geothermal energy necessitates the performance evaluation and economic analysis of the geothermal heating systems. This work presented a field study of the long-term operating performance of a geothermal heating system in Xixian New Area, China. Nine deep coaxial ground heat exchangers (GHEs) with depths of 2,500 m were adopted for space heating to the residential buildings, with a total heating area and heating load of 136,097.71 m2 and 6,082 kW, respectively. The system’s 30-year running performance at various volumetric flow rates and operating modes was simulated. Through response surface analysis and multi-objective optimization, the levelized cost of energy (LCOE) and payback period were obtained based on the thermal performance analysis. It is concluded that the operating parameters have a significant impact on the system economy. When the daily operating time reduces from 24 hours to 8 hours, the payback period will be lowered from more than 25 years to approximately 11 years. When the volumetric flow rate is 35 m3·h-1, the examined system achieves the lowest LCOE. The minimum values of LCOE are 13.2 $/GJ, 11.6 $/GJ, 9.4 $/GJ, 7.8 $/GJ and 5.6 $/GJ when the system operates 24 hours (continuous operation), 20 hours, 16 hours, 12 hours and 8 hours a day, respectively. With the optimal flow rate, the average heat exchange rate of the single GHE increases from 295 kW to 519 kW after 30 years of operation when the daily operating time is reduced from 20 hours to 8 hours. The proposed method and findings can be used to guide the high-efficiency operation, which is conducive to reducing operating costs of geothermal heating systems.

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Section: Field Test Results and Numerical Scheme Validationmentioning

confidence: 99%

A case study on long-term performance optimization of a geothermal heating system

Jia

Duan²,

Xue

et al. 2022

IOP Conf. Ser.: Earth Environ. Sci.

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“…With the advantages of much less land demand, potentially higher temperature available, particularly for high geothermal gradient areas, and higher efficiency of heat pump units, DBHEs can be constructed almost everywhere due to the fact that neither naturally occurring thermal aquifer systems nor special geological structures are needed (Le Lous et al 2015;Hellstrom and Sanner 1994;Jia et al 2017;Deng et al 2019). They can be made space effective with a small or negligible visual footprint (Welsch et al 2017) and provide a desirable complementary heat source especially for applications in coldclimate regions with a negatively balanced thermal load where more thermal energy is extracted than recharged.…”

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confidence: 99%

An efficient hybrid model for thermal analysis of deep borehole heat exchangers

et al. 2020

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Clean and renewable energy resources are drawing increasing attention due to their advantages compared to fossil fuels which have a considerable impact on global warming and environmental pollution. As one of the primary choices to replace conventional energy sources, geothermal energy is becoming more and more attractive with wide availability, low operational cost and low CO 2 emissions. It has been rapidly developed for space heating and cooling in the recent decades (Diao and Fang 2006; Yang

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Experimental Analysis of a Solar Energy Storage Heat Pump System

Chen

Ling

et al. 2021

J. Therm. Sci.

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Heat transfer performance of buried extremely long ground-coupled heat exchangers with concentric pipes

Cited by 11 publications

References 4 publications

A case study on long-term performance optimization of a geothermal heating system

A case study on long-term performance optimization of a geothermal heating system

An efficient hybrid model for thermal analysis of deep borehole heat exchangers

Experimental Analysis of a Solar Energy Storage Heat Pump System

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