Feasibility study of a novel hybrid energy system combining photovoltaic-thermal and modular ground heat exchanger

Bae, Sangmu; Nam, Yujin; Lee, Euy-Joon; Entchev, Evgueniy

doi:10.1016/j.jobe.2022.105241

Cited by 5 publications

(4 citation statements)

References 18 publications

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“…5. (a), R 2 and RMSE of the training result are 0.999 and 0.005, respectively. The trained model is tested on remained 20% data.…”

Section: Training Results Of Xgboostmentioning

confidence: 95%

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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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“…5. (a), R 2 and RMSE of the training result are 0.999 and 0.005, respectively. The trained model is tested on remained 20% data.…”

Section: Training Results Of Xgboostmentioning

confidence: 95%

“…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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“…Wang then examined the economics of the two systems when their capacities are equal. Bae et al [12] set up an experimental device for the PV-T/GSHP coupling system, examined how well it performed in the heating and cooling modes and contrasted the coupling system's economic benefits with the conventional system. The results show that, in the event of rising electricity prices and government subsidies, the coupling system's initial investment cost payback period was 15 years.…”

Section: Introductionmentioning

confidence: 99%

Multi-objective optimization study of CCHP-GSHP-PV-ST system under different climatic zone conditions

Zeng,

Long

2023

J. Phys.: Conf. Ser.

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In this research, a system with multiple energy sources of combined cooling, heating, and power (CCHP)/ground source heat pump (GSHP)/photovoltaic (PV)/solar thermal collector (ST) (CCHP-GSHP-PV-ST system) is constructed. And this system is combined with the operation strategy of following total electric demand, that is, giving priority to meeting the electrical load of the building, the additional power of the coupling system, and the power of driving the GSHP. Therefore, a model for multi-objective optimization of the CCHP-GSHP-PV-ST system based on energy, environment, and economic indicators is established, and the optimization model is resolved using the genetic algorithm. The load simulation of office buildings in representative cities of five climate zones in China (Harbin (severe cold climate), Beijing (cold climate), Kunming (mild climate), Guangzhou (hot summer and warm winter climate), Changsha (hot summer and cold winter climate)) was selected as the basis for coupling system optimization, and the multi-objective optimization study of CCHP-GSHP-PV-ST system under different climate zone conditions was carried out. The findings indicate: (1) Under various climatic zone conditions, the coupling system’s optimized composition varies a little; (2) The multi-energy coupled system of office buildings in Beijing (cold climate) has primary energy saving rates, carbon dioxide emission reduction rates, annual total cost saving rates, and comprehensive performance that are respectively 46.06%, 60.43%, 44.05%, and 50.18% better than the split-production system when compared to other climate zones.

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“…Current research in the field of building energy and heat transfer through the ground uses advanced numerical models [14][15][16]. Nevertheless, the installation of such devices significantly alters the course of heat flow in the ground [17,18].…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of the Effect of Floor Depression on the Extent of Thermal Interaction with the Ground and Energy Management Using a Vegetable Cold Store as an Example

Sokołowski,

Jakubowski,

Nawalany

et al. 2023

Energies

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The thermal interaction between cooling facilities and the ground is most often discussed in terms of the appropriate insulation of building partitions. Unfortunately, there is little information about the potential of using ground thermal accumulation to support the shaping of the microclimate in cooling facilities by embedding them in the ground. This problem is particularly important in the context of striving to reduce the energy demand of buildings. The article discusses a new scientific problem related to the effect of vegetable cold storage floors being recessed into the ground on the surrounding land’s impact range and on its energy management. Validation of the numerical model was performed based on actual year-round field surveys. These surveys were conducted in a free-standing vegetable cold storage facility located in southern Poland. The results of the study allowed us to determine the contribution of the land to the energy balance of the cold storage. A floor recessed into the ground doubled the ground’s contribution to the energy balance. The most important research results showed that the range of thermal impact on the surrounding ground also increased by 2.0 m more than that of a building with the floor located at ground level. An evaluation of the heat flow between the cold storage and the ground in the cases analyzed was also carried out. The analysis of the ground heat exchange balance on an annual basis showed high energy gains of 2055 kWh. The total energy demand for cooling was 1723 kWh, while it was 1204 kWh for heating. The results of the analysis of the heat exchange intensity between the indoor air and the ground showed that the ground contribution accounted for 16.6% of the total energy balance of the cold storage. The highest energy gains from the ground were found in October and amounted to 478 kWh. Due to the summer shutdown, there was an intense heat flow to the ground in July, which amounted to 588 kWh.

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Feasibility study of a novel hybrid energy system combining photovoltaic-thermal and modular ground heat exchanger

Cited by 5 publications

References 18 publications

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

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

Multi-objective optimization study of CCHP-GSHP-PV-ST system under different climatic zone conditions

Numerical Analysis of the Effect of Floor Depression on the Extent of Thermal Interaction with the Ground and Energy Management Using a Vegetable Cold Store as an Example

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