Hybrid Solar Geothermal Heat Pump System Model Demonstration Study

Kim, Yujin; Yang, Libing; Entchev, Evgueniy; Cho, Soolyeon; Kang, Eun-Chul; Lee, Euy-Joon

doi:10.3389/fenrg.2021.778501

Cited by 10 publications

(4 citation statements)

References 21 publications

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“…Consequently, there is a need for comprehensive studies on the sensitivity of system performance to variations in operational control. The sensitivity study presented in this paper revealed the advanced system control logic [40].…”

Section: Introductionmentioning

confidence: 81%

Research on the Optimisation of Dual-Heat-Source Heating Systems in Nearly Zero-Energy Buildings

Hou,

Xu,

Zhang

et al. 2024

Sustainability

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A nearly zero-energy building is characterised by its low energy demand and enhanced thermal insulation, with great potential to integrate renewable energy systems to satisfy various demands and improve energy efficiency. Solar energy is a primary renewable energy resource that can be harnessed in different ways to provide electricity, heating, and cooling in building applications. In this study, a solar–ground-source heat pump system was designed and established in a nearly zero-energy building. The system’s performance was presented, and its control strategy was optimised. To evaluate and assess the operation of the solar energy system, an experimental setup was built, and the experiment was divided into two periods, taking into account the weather conditions. In the first experimental period, different parameters of the heating system were tested and evaluated. In this regard, the variation trends of the heat pump unit’s coefficient of performance, the system coefficient of performance, the collector start-up temperature difference, and the heat pump setting temperature were analysed under different parameter combinations. On this basis, the optimal operating parameters were identified for different heating periods. In the second period, the optimal operating parameters identified were used to carry out heating experiments. The results highlighted that the adoption of the preferred operating parameters increases the percentage of direct solar energy supply by 2.0%. Additionally, the system coefficient of performance increases by 8.9%, the unit coefficient of performance increases by 6.7%, the carbon emissions are reduced by 4.18 tonnes, the SO2 emissions are reduced by 0.143 tonnes, and the dust emissions are reduced by 0.1 tonnes. The findings of this study can provide useful data and a guiding reference for optimising and promoting the implementation of renewable-energy-driven heating systems for nearly zero-energy buildings in severe cold regions.

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Section: Introductionmentioning

confidence: 81%

Research on the Optimisation of Dual-Heat-Source Heating Systems in Nearly Zero-Energy Buildings

Hou,

Xu,

Zhang

et al. 2024

Sustainability

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“…As shown in Figure 19, with a targeted COP of 2, heat sources need to be adjusted depending on the process temperature. If the available waste heat does not allow to satisfy the design, it is also possible to design a hybrid system with solar thermal [50] or geothermal pits [169]. Alternative solutions to provide further efficient systems are to rework the heat pump design and sufficiently increase its exergy efficiency to enable good performances with greater temperature lift.…”

Section: Vapor Compression Heat Pumpsmentioning

confidence: 99%

A Review of Energy-Efficient Technologies and Decarbonating Solutions for Process Heat in the Food Industry

Faraldo,

Byrne

2024

Energies

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Heat is involved in many processes in the food industry: drying, dissolving, centrifugation, extraction, cleaning, washing, and cooling. Heat generation encompasses nearly all processes. This review first presents two representative case studies in order to identify which processes rely on the major energy consumption and greenhouse gas (GHG) emissions. Energy-saving and decarbonating potential solutions are explored through a thorough review of technologies employed in refrigeration, heat generation, waste heat recovery, and thermal energy storage. Information from industrial plants is collected to show their performance under real conditions. The replacement of high-GWP (global warming potential) refrigerants by natural fluids in the refrigeration sector acts to lower GHG emissions. Being the greatest consumers, the heat generation technologies are compared using the levelized cost of heat (LCOH). This analysis shows that absorption heat transformers and high-temperature heat pumps are the most interesting technologies from the economic and decarbonation points of view, while waste heat recovery technologies present the shortest payback periods. In all sectors, energy efficiency improvements on components, storage technologies, polygeneration systems, the concept of smart industry, and the penetration of renewable energy sources appear as valuable pathways.

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“…The prolonged operation of a GHP system causes problems with the ground thermal environment due to ground heat accumulation because of this load imbalance, which reduces the performance of the system [13]. Hybrid GHP systems are considered an economical and practical alternative to compensate for these problems [14][15][16][17][18]. Hybrid GHP systems use a secondary heat sink for buildings with large cooling loads or a secondary heat source for buildings with large heating loads [19].…”

Section: Introductionmentioning

confidence: 99%

Variable Water Flow Control of Hybrid Geothermal Heat Pump System

Shin,

Kim,

Lee

et al. 2023

Energies

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Ground heat accumulation caused by imbalanced heating and cooling loads in a building can cause the heat-source temperature to increase as the operating age of a geothermal heat pump (GHP) system increases. An alternative system to improve upon this situation is the hybrid GHP system. This study reviews existing research on GHP systems and hybrid GHP systems, variable water flow (VWF) control, and coefficient of performance (COP) prediction. Generally, constant flow control is applied to the circulating pump to provide a flow rate according to the maximum load. The need for VWF control was identified because the hybrid GHP system is used mainly as a heating and cooling heat source system for partial loads rather than the entire building load. Previous studies on predicting the COPs of GHP systems developed prediction models by selecting input values based on mathematical models, collecting data through multiple measurement points, and utilizing data from production environments. The model can be limited by the field environment, and it is necessary to predict the COP using machine learning based on existing field monitoring data.

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Hybrid Solar Geothermal Heat Pump System Model Demonstration Study

Cited by 10 publications

References 21 publications

Research on the Optimisation of Dual-Heat-Source Heating Systems in Nearly Zero-Energy Buildings

Research on the Optimisation of Dual-Heat-Source Heating Systems in Nearly Zero-Energy Buildings

A Review of Energy-Efficient Technologies and Decarbonating Solutions for Process Heat in the Food Industry

Variable Water Flow Control of Hybrid Geothermal Heat Pump System

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