Thermal and economic performance of horizontal ground source heat pump systems with different flowrate control methods

Zhou, Kun; Mao, Jinfeng; Li, Yong; Zhang, Hua; Chen, Shangyuan; Chen, Fei

doi:10.1016/j.jobe.2022.104554

Cited by 9 publications

(11 citation statements)

References 39 publications

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“…This type of system can also be coupled with borehole GHEs. Zhou et al [33] designed a system combining a borehole GHE and an HGHE to reduce the cost of conventional borehole GHE heat pump systems by determining the optimal shape factors, building load distribution scheme and the length of the hybrid GHE.…”

Section: Discussionmentioning

confidence: 99%

Performance Assessment of Horizontal Ground Heat Exchangers under a Greenhouse in Quebec, Canada

Léveillée-Dallaire,

Raymond,

Snæbjörnsson

et al. 2023

Energies

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Among the various approaches to agriculture, urban greenhouse farming has gained attention for its ability to address food security and disruptions to global food supply chains. However, the increasing impact of climate change and global warming necessitates sustainable methods for heating and cooling these greenhouses. In this study, we focused on the potential of slinky-coil horizontal ground heat exchangers (HGHEs) to meet the energy demands of urban greenhouses, assuming they are installed beneath the greenhouse to optimize space utilization. Climate data, an energy consumption profile for a greenhouse being designed in La Pocatière (Québec, Canada) and in-situ ground thermal properties assessments were used to build numerical models using FEFLOW and to evaluate the performance of the HGHEs simulated. Four scenarios were simulated and compared to a base case, considering the greenhouse’s maintenance of a constant temperature above an HGHE limited to the greenhouse’s dimensions. Our findings reveal that a minimum of 7.1% and 26.5% of the total heating and cooling loads of a small greenhouse (133 m2 area) can be covered by HGHEs installed at a 1.5 m depth when there is no greenhouse above. When installed under a greenhouse with a constant inside temperature of 21 °C, the coverage for heating loads increases to 22.8%, while cooling loads decrease to 24.2%. Sensitivity analysis demonstrates that the constant temperature in the greenhouse reduces the system’s reliance on surface temperature fluctuations for both heating and cooling, albeit with reduced efficiency for cooling.

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Section: Discussionmentioning

confidence: 99%

Performance Assessment of Horizontal Ground Heat Exchangers under a Greenhouse in Quebec, Canada

Léveillée-Dallaire,

Raymond,

Snæbjörnsson

et al. 2023

Energies

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“…The results show that the groundwater level and temperature have the greatest impact on the performance of the groundwater source heat pump system, followed by submersible pumps and heat exchangers (Kim and Nam, 2016). Moreover, factors such as water flow rate (Zhou et al, 2022a), performance parameters (Sang et al, 2022), porous medium (Na and Xia, 2021), layout of pumping and recharge wells (Wen et al, 2022;Yan et al, 2023) and pipe corrosion play significant role. Obviously, a great number of researchers also offer optimization strategies for groundwater source heat pump systems (Nam and Ooka, 2010;Lu et al, 2015;Zhu et al, 2015;Zhen et al, 2017;Liu et al, 2019;Li et al, 2021b;Zhang et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

“…Halilovic et al (2022) proposed a strategy for optimizing the hair of the well layout of groundwater source heat pump systems to maximize the utilization of thermal potential of groundwater. Zhou et al (2022a) investigated the economics of ground source heat pump systems with various flow control methods and highlighted the significance of variable flow regulation methods for enhancing thermal and economic performance. Luo and Ma, (2022) proposed an integrated management strategy for system operation that significantly improved thermal efficiency and coefficient of performance in comparison to the conventional model.…”

Section: Introductionmentioning

confidence: 99%

Study on heat exchange of groundwater under complex geological conditions in karst area of south China

Wang

Huang³

2023

Front. Earth Sci.

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This paper takes a groundwater source heat pump in the region as the research object and based on field research, experimental tests combined with comparative analysis, the data on its operation is monitored and analyzed in terms of operation, energy saving, and environment. The results show that the cooling temperatures of the test rooms were all below 26°C, the average coefficient of performance of the units was 4.61–4.93 and the average coefficient of performance of the system was 3.08–3.27. In addition, compared to conventional water-cooled chillers, 466 tons of standard coal could be saved in one cooling season, resulting in a reduction of 1,150.8 tons of carbon dioxide emissions, 9.3 tons of sulfur dioxide emissions and 4.7 tons of dust emissions The savings in operating costs are 793,000 RMB. This shows that the groundwater source heat pump has good energy efficiency and economy. The research results obtained in this paper provide a reference for improving energy efficiency and optimizing the operation of the groundwater source heat pump system. It is of great significance to the application of groundwater source heat pump systems in areas with complex geological environments.

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“…The vertical GSHP system, compared with the horizontal one, is designed to extract more geothermal heat which also brings higher installation cost [2][3][4]. Thus, it is important to figure out parameters that affect heat extraction, and search for optimal operation strategy.…”

Section: Introductionmentioning

confidence: 99%

Prediction and optimization of heat extraction in ground source heat pump system using surrogate model

Chaoran,

Chanjuan

2024

IOP Conf. Ser.: Earth Environ. Sci.

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Ground source heat pump (GSHP) system, which extracts underground heat for building heating and cooling, uses renewable energy to decrease CO2 emissions for the goals of carbon peaking and carbon neutrality. Hence, the prediction and optimization work is significate especially for existing GSHP system. This study focuses on the prediction of heat extraction and optimization of operational strategy based on a three-story house installed with GSHP system located in Cleveland, Ohio, USA. Firstly, the numerical model is built to simulate operation of ground heat exchanger (GHE). Then, Latin hypercube sampling (LHS) is employed to generate different parameter combinations that are calculated to get the heat extraction results for training XGBoost-based surrogate model. Finally, the particle swarm optimization (PSO) is used to realize the optimization of operational strategy. The results indicate that the numerical model can simulate the GHE well, and the accuracy of surrogate model can reach 0.990. The COP of GSHP system is maximized to protect the soil heat balance and reduce the electrical energy consumption. The optimization method also makes it possible to evaluate the heat extraction capability, and prepare for the extra heat demand in advance.

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Thermal and economic performance of horizontal ground source heat pump systems with different flowrate control methods

Cited by 9 publications

References 39 publications

Performance Assessment of Horizontal Ground Heat Exchangers under a Greenhouse in Quebec, Canada

Performance Assessment of Horizontal Ground Heat Exchangers under a Greenhouse in Quebec, Canada

Study on heat exchange of groundwater under complex geological conditions in karst area of south China

Prediction and optimization of heat extraction in ground source heat pump system using surrogate model

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