Measurement and Verification of Integrated Ground Source Heat Pumps on a Shared Ground Loop

Shin, Jeong Soo; Park, Jong Woo; Kim, Sean Hay

doi:10.3390/en13071752

Cited by 8 publications

(18 citation statements)

References 21 publications

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“…Dual-source HP/operation mode and innovative system configurations (e.g. [55][56][57]). Dynamic management of GSHP system according to building energy needs.…”

Section: Installationmentioning

confidence: 99%

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Sustainability of Shallow Geothermal Energy for Building Air-Conditioning

2021

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Geothermal heat pumps have a widespread diffusion as they are able to deliver relatively higher energy output than other systems for building air-conditioning. The exploitation of low-enthalpy geothermal energy, however, presents crucial sustainability issues. This review investigates the primary forms of the environmental impact of geothermal heat pumps and the strategies for their mitigation. As life-cycle analyses shows that the highest impacts arise from installation and operation stages, most optimization studies focus on system thermodynamics, aiming at maximizing the energy performance via the optimization in the design of the different components interacting with the ground and serviced building. There are environmental studies of great relevance that investigate how the climate and ground properties affect the system sustainability and map the most suitable location for geothermal exploitation. Based on this review, ground-source heat pumps are a promising technology for the decarbonization of the building sector. However, a sustainable design of such systems is more complex than conventional air-conditioning systems, and it needs a holistic and multi-disciplinary approach to include the broad environmental boundaries to fully understand the environmental consequences of their operation.

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“…Dual-source HP/operation mode and innovative system configurations (e.g. [55][56][57]). Dynamic management of GSHP system according to building energy needs.…”

Section: Installationmentioning

confidence: 99%

“…The works Shin et al [56] propose a GSHP system with two heat pumps sharing the same geothermal field. The two HPs are for the space conditioning and service hot water, respectively.…”

Section: Advanced and Integrated Solutionsmentioning

confidence: 99%

Sustainability of Shallow Geothermal Energy for Building Air-Conditioning

2021

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“…Environmental and energy issues are severe at present. Therefore, improving the utilization efficiency of low-grade thermal energies, such as solar energy [1], geothermal energy [2], and internal combustion engine waste heat [3], is an important means to alleviate the global climate change and energy crisis. The conversion of low-grade thermal energy into electrical energy at present is mainly achieved through the thermodynamic cycle.…”

Section: Introductionmentioning

confidence: 99%

Performance Prediction and Working Fluid Active Design of Organic Rankine Cycle Based on Molecular Structure

et al. 2022

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Working fluid selection is crucial for organic Rankine cycles (ORC). In this study, the relationship between molecular structure and ORC performance was established based on the quantitative structure–property relationship (QSPR) and working fluid parameterized model (WFPM), from which an ORC working fluid was actively designed. First, the QSPR model with four properties, namely, critical temperature (Tc), boiling point (Tb), critical pressure (pc), and isobaric heat capacity (cp0), was built. Second, the evaporation enthalpy (hvap), evaporation entropy (svap), and thermal efficiency (η) were estimated by WFPM, and the results were compared with those using REFPROP to verify the calculation accuracy of the “QSPR+WFPM” coupling model. The average absolute relative deviations of evaporation enthalpy and entropy are below 8.44%. The maximum relative error of thermal efficiency is 6%. Then, the thermodynamic performance limit of ORC and corresponding thermophysical properties of the ideal working fluid were calculated at typical geothermal source conditions. Finally, the active design of the working fluid was conducted with the ideal working fluid Tc and pc as the target. The research shows that C3H4F2 and C4H3F5 are optimal working fluids at 473.15 and 523.15 K heat sources, respectively.

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“…It was also obtained that the studied configuration was a potent and resilient alternative for conventional air source heat pumps. Shin et al [24] introduced a novel combined system comprising ground source heat pumps for air conditioning and hot water delivery supplied by the same water loop. They investigated the feasibility of the proposed design for a case study hotel using TRNSYS software [25].…”

Section: Introductionmentioning

confidence: 99%

Design and Parametric Investigation of an Efficient Heating System, an Effort to Obtain a Higher Seasonal Performance Factor

2021

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The present work introduces an innovative yet feasible heating system consisting of a ground source heat pump, borehole thermal energy storage, an auxiliary heater, radiators, and ventilation coils. The concept is developed by designing a new piping configuration monitored by a smart control system to reduce the return flow temperature and increase the temperature differential between the supply and return flows. The radiators and ventilation heating circuits are connected in series to provide the heat loads with the same demand. The investigation of the proposed model is performed through developed Python code considering a case study hospital located in Norway. The article presents, after validation of the primary heating system installed in the hospital, a parametric investigation to evaluate the effect of main operational parameters on the performance metrics of both the heat pump and the total system. According to the results, the evaporator temperature is a significant parameter that considerably impacts the system performance. The parametric study findings show that the heat pumps with a thermal capacity of 400 kW and 600 kW lead to the highest heat pump and total seasonal performance factors, respectively. It is also observed that increasing the heat pump capacity does not affect the performance indicators when the condensation temperature is 40 °C and the heat recovery is 50%. Moreover, choosing a heat pump with a smaller capacity at the heat recovery of 75% (or higher) would be an appropriate option because the seasonal performance values are not varied by changing the heat pump capacity. The results reveal that reducing return temperature under a proper parameters selection results in substantially higher seasonal performance factors of the heat pump and total system. These outcomes are in-line with the United Nations sustainable development goals including Sustainable Cities and Communities.

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Measurement and Verification of Integrated Ground Source Heat Pumps on a Shared Ground Loop

Cited by 8 publications

References 21 publications

Sustainability of Shallow Geothermal Energy for Building Air-Conditioning

Sustainability of Shallow Geothermal Energy for Building Air-Conditioning

Performance Prediction and Working Fluid Active Design of Organic Rankine Cycle Based on Molecular Structure

Design and Parametric Investigation of an Efficient Heating System, an Effort to Obtain a Higher Seasonal Performance Factor

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