A Study on the Effect of Performance Factor on GSHP System through Real-Scale Experiments in Korea

Kim, Hongkyo; Nam, Yujin; Bae, Sangmu; Choi, Jae Sang; Kim, Sang Bum

doi:10.3390/en13030554

Cited by 3 publications

(3 citation statements)

References 16 publications

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“…Numerical Study Nam et al [6] Development of a numerical model to predict heat exchange rates of a GSHP system Congedo et al [7] CFD simulations of horizontal GHXs, comparison of different configurations Dasare and Saha [8] Numerical study of horizontal GHX for high energy demand applications Oh et al [18] Performance analysis of a low-depth unit-type GHX using numerical simulation Yoon et al [14] Thermal efficiency evaluation and cost analysis of different types of GHXs in energy piles Gabrielli and Bottarelli [19] Financial and economic analysis of ground-coupled HP using shallow GHX Selamat et al [9] Numerical study of horizontal GHXs for design optimization through CFD simulation Habibi and Hakkaki-Fard [20] Evaluation and improvement of thermal performance of different types of horizontal GHXs based on techno-economic analysis Saeidi et al [21] Numerical simulation of a novel spiral type GHX for enhancing heat transfer performance of geothermal HP Kim and Nam [10] Development of performance prediction equation for a modular GHX Experimental Study Shonder et al [22] A new comparison of design methods for vertical GHXs for residential applications Esen et al [11] Energy and exergy analysis of a ground-coupled HP system with two horizontal GHXs Luo et al [12] Thermal performance and economic evaluation of double U-tube borehole heat exchanger with three different borehole diameters Yoon et al [23] Evaluation of thermal efficiency in different types of horizontal GHXs Luo et al [13] Thermo-economic analysis of four different types of GHXs in energy piles Sipio and Bertermann [15] Factors influencing thermal efficiency of horizontal GHXs Kayaci and Demir [24] Long time performance analysis of GSHPs for space heating and cooling applications based on thermo-economic optimization criteria Arif et al [16] GSHP with horizontal GHXs for space cooling in hot tropical climates Kim et al [17] Analysis on the effect of performance factor on GSHP system…”

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confidence: 99%

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Analysis of Heat Exchange Rate for Low-Depth Modular Ground Heat Exchanger through Real-Scale Experiment

Kim

Nam

et al. 2021

Energies

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A ground source heat pump system is a high-performance technology used for maintaining a stable underground temperature all year-round. However, the high costs for installation, such as for boring and drilling, is a drawback that prevents the system to be rapidly introduced into the market. This study proposes a modular ground heat exchanger (GHX) that can compensate for the disadvantages (such as high-boring/drilling costs) of the conventional vertical GHX. Through a real-scale experiment, a modular GHX was manufactured and buried at a depth of 4 m below ground level; the heat exchange rate and the change in underground temperatures during the GHX operation were tracked and calculated. The average heat exchanges rate was 78.98 W/m and 88.83 W/m during heating and cooling periods, respectively; the underground temperature decreased by 1.2 °C during heat extraction and increased by 4.4 °C during heat emission, with the heat pump (HP) working. The study showed that the modular GHX is a cost-effective alternative to the vertical GHX; further research is needed for application to actual small buildings.

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Section: Year Author(s) Descriptionmentioning

confidence: 99%

“…The result was that the GSHP consumed less electricity than the ASHP, and the CO 2 emission rate was also reduced. Kim et al [17] analyzed the effect of design factors such as shape and length of a GHX and the capacity of the heat storage tank (HST) on the performance of the GSHP system.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Heat Exchange Rate for Low-Depth Modular Ground Heat Exchanger through Real-Scale Experiment

Kim

Nam

et al. 2021

Energies

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“…Park et al [8] conducted analysis on the optimal design of the length of the ground heat exchanger according to the entering water temperature (EWT) of the heat pump using optimization simulation software. Kim et al [9] analyzed the effects of design elements, such as the geometry and length of the ground heat exchanger and the capacity of the heat storage tank, on the system performance for actual buildings. Kim et al [10] also determined the optimal design for the length of the ground heat exchanger, considering EWT for the analysis of economic efficiency.…”

Section: Research Backgroundmentioning

confidence: 99%

Development of Optimal Design Method for Ground-Source Heat-Pump System Using Particle Swarm Optimization

2020

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The building sector is an energy-consuming sector, and the development of zero-energy buildings (ZEBs) is necessary to address this. A ZEB’s active components include a system that utilizes renewable energy. There is a heat-pump system using geothermal energy. The system is available regardless of weather conditions and time, and it has attracted attention as a high-performance energy system due to its stability and efficiency. However, initial investment costs are higher than other renewable energy sources. To solve this problem, design optimization for the capacity of geothermal heat-pump systems should be performed. In this study, a capacity optimization design of a geothermal heat-pump system was carried out according to building load pattern, and emphasis was placed on cost aspects. Building load patterns were modeled into hospitals, schools, and apartments, and, as a result of optimization, the total cost over 20 years in all building load patterns was reduced.

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Development of a Low-Depth Modular GHX through a Real-Scale Experiment

et al. 2022

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The global energy sector is aiming to rapidly transform energy systems into those less dependent on fossil fuels to reduce their harmful effects on the climate. Although ground source heat pump (GSHP) systems are more efficient than conventional air-source heat pump (ASHP) systems, the high initial investment cost, particularly for a vertical closed-loop type ground heat exchanger (GHX), makes it difficult to incorporate them into small buildings. This paper proposes a low-depth modular GHX for reducing cost and improving the workability of GSHPs. A modular GHX is a cubical structure comprising tubes and buried using an excavator at a depth 4 m below the ground surface. This GHX is manufactured at a factory, carried by a small truck, and then installed by a small lift or a backhoe such that it can be installed in small buildings or narrow spaces at low depths underground. In this research, the performance and feasibility analyses of modular and vertical GHXs were conducted via a real-scale experiment. The results demonstrate that the modular GHX influences the workability of GSHPs by 91% during the heating period and 70% during the cooling period. In contrast to the conventional HVAC, the modular and vertical GHXs could recover the initial investment costs in 4 years and 10 years, respectively.

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A Study on the Effect of Performance Factor on GSHP System through Real-Scale Experiments in Korea

Cited by 3 publications

References 16 publications

Analysis of Heat Exchange Rate for Low-Depth Modular Ground Heat Exchanger through Real-Scale Experiment

Analysis of Heat Exchange Rate for Low-Depth Modular Ground Heat Exchanger through Real-Scale Experiment

Development of Optimal Design Method for Ground-Source Heat-Pump System Using Particle Swarm Optimization

Development of a Low-Depth Modular GHX through a Real-Scale Experiment

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