Proposal for a Method Predicting Suitable Areas for Installation of Ground-Source Heat Pump Systems Based on Response Surface Methodology

Kaneko, Shohei; Tomigashi, Akira; Ishihara, Takeshi; Shrestha, Gaurav; Yoshioka, Mayumi; Uchida, Yoshiyuki

doi:10.3390/en13081872

Cited by 5 publications

(3 citation statements)

References 30 publications

(61 reference statements)

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“…In these areas, subsurface temperature gradients are complex, with large temperature gradients in the ascending groundwater basins and small temperature gradients in the descending basins (Uchida et al, 2014). For example, Kaneko et al (2020) modeled the groundwater ow in the Sendai Plain; the Hi-net Sendai station is located in an area where the subsurface temperature is relatively high, and the temperature pro le shows an upward ow type in the shallow part, which is consistent with this groundwater ow model.…”

Section: -1 Heat Flowsupporting

confidence: 61%

Heat Flow Data And Thermal Structure In North East Japan

Matsumoto

Yamada

Iizuka

2022

Preprint

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New heat flow data corrected for climate change over the entire northeastern region of Japan were obtained using the temperature profile of the borehole of NIED High Sensitivity Seismograph Network (Hi-net). In addition, the crustal temperature structure was obtained by using a crustal structure model that takes into account the temperature dependence of thermal conductivity and the difference in heat generation due to lithology, using a crustal structure model that takes into account sedimentary layers rather than a uniform structure model with exposed bedrock at the surface. The results show that the crustal temperature structure in areas with thick sedimentary layers is improved compared to the previous model.

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Section: -1 Heat Flowsupporting

confidence: 61%

Heat Flow Data And Thermal Structure In North East Japan

Matsumoto

Yamada

Iizuka

2022

Preprint

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“…On the other hand, it has been pointed out that groundwater flow systems are widespread in the plains (Miyakoshi and Uchida 2001). In these areas, subsurface temperature gradients are complex, with large temperature gradients in the ascending groundwater basins and small temperature gradients in the descending basins (Uchida et al 2014;Kaneko et al 2020). On the other hand, most of the D-class wells, which were judged to have powerful groundwater influence, are in the plains with thick sedimentary layers, and their temperature profiles show downward flow type.…”

Section: Influence Of Subsurface Fluidsmentioning

confidence: 99%

Heat flow data and thermal structure in northeastern Japan

Matsumoto

Yamada

Iizuka

2022

Earth Planets Space

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New heat flow data corrected for climate change over Northeastern Japan were obtained using the temperature profile of the borehole of the High Sensitivity Seismograph Network (Hi-net). The obtained spatial distribution of heat flow shows low heat flow on the forearc side, high heat flow along the Ou Backbone Range, and low heat flow in the plains on the back-arc side. However, the distribution is not clearly divided into high and low heat flow along the VF front; for example, the low heat flow extends from near the northern Kitakami Mountains on the forearc side to the Ou Backbone Range crossing the VF, while the high heat flow extends to the central Kitakami Mountains and Sendai plain on the forearc side. In addition, a crustal temperature structure model was developed that considers into account the presence of sedimentary layers, the temperature dependence of thermal conductivity, and differences in heat generation due to lithology. There is a good correlation between this temperature structure and the lower limit of the seismogenic layer, which is between 400 and 450 °C. Compared to previous studies, the crustal thermal structure calculation method assumed is a model whose estimated temperature distribution is sensitive to structural differences; however, a more accurate estimation of the temperature structure is possible if detailed structural information is available. On the other hand, it seems necessary to treat fluid behavior in more detail in areas of high heat flow. However, the estimation of crustal temperature structure, especially in regions with thick sedimentary layers, is considered an improvement over the previous study. Graphical Abstract

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“…The cold plume develops most when there is a heat imbalance in the borehole heat exchanger (BHE), but seasonal heat storage can diminish the effect [21,22]. Additionally, a groundwater flow field can somewhat increase the heat exchange efficiency and sustainability of BHEs [23][24][25]. Moreover, the recovery of the rock-soil body temperature is more favorable with a higher rate of groundwater percolation [26].…”

Section: Introductionmentioning

confidence: 99%

Optimizing the Layout of a Ground Source Heat Pump System with a Groundwater–Thermal Coupling Model

Li,

Liu,

Wang

et al. 2023

Energies

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The exploitation and utilization of shallow geothermal energy are of great significance to realizing China’s “double carbon” goal and promoting a green economy and social development. However, many projects using ground source heat pumps to exploit shallow geothermal energy have disrupted the thermal balance of the geothermal field due to insufficient preliminary research, affecting the sustainable utilization of shallow geothermal energy. Therefore, a 3D groundwater–thermal coupling model was established in this paper using the geotemperature data of a ground source heat pump system in Xi’an. This study investigated the response characteristics of the groundwater–thermal system to the ground source heat pump system using the numerical simulation method and discussed the optimal layout scheme of the system on this basis. After years of simulation, it was found that long-term operation of the ground source heat pump system under actual operation produces “cold accumulation”. In addition to artificial intervention of the groundwater flow field, the effects of the system operating parameters and layout settings are also investigated to alleviate this cold accumulation. The results show that changing the operating parameters so that the heat transfer is the same in winter and summer, cross-locating the cooling holes with the heating holes, and placing multiple pumping and recharge wells downstream can alleviate the cold accumulation in the heat exchange zone. The results of this numerical simulation study provide an important reference for solutions to mitigate the accumulation of ground cold and heat in developing shallow geothermal energy using borehole heat exchangers and to suppress the downstream geotemperature disturbance via the ground source heat pump system.

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Proposal for a Method Predicting Suitable Areas for Installation of Ground-Source Heat Pump Systems Based on Response Surface Methodology

Cited by 5 publications

References 30 publications

Heat Flow Data And Thermal Structure In North East Japan

Heat Flow Data And Thermal Structure In North East Japan

Heat flow data and thermal structure in northeastern Japan

Optimizing the Layout of a Ground Source Heat Pump System with a Groundwater–Thermal Coupling Model

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