Optimizing the design of large-scale ground-coupled heat pump systems using groundwater and heat transport modeling

Fujii, Hikari; Itoi, Ryuichi; Fujii, Junichi; Uchida, Yoshiyuki

doi:10.1016/j.geothermics.2005.04.001

Cited by 78 publications

(30 citation statements)

References 2 publications

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“…3, considering heat balance of the heat carrier fluid in the lth ground heat exchanger leads to the following equation along with Eq. (8) …”

Section: Detail Methodsmentioning

confidence: 99%

“…There are some reports related to comparison to the other simulation models [6], while several field experiments and analyses of GSHP systems with multiple ground heat exchangers has also been conducted [7,8]. However, it is not easy to find a report in which field test of heat extraction with multiple ground exchangers was carried out for validation of the calculation result.…”

Section: Introductionmentioning

confidence: 99%

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Calculation algorithm of the temperatures for pipe arrangement of multiple ground heat exchangers

Katsura

Nagano

Narita

et al. 2009

Applied Thermal Engineering

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“…3, considering heat balance of the heat carrier fluid in the lth ground heat exchanger leads to the following equation along with Eq. (8) …”

Section: Detail Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Calculation algorithm of the temperatures for pipe arrangement of multiple ground heat exchangers

Katsura

Nagano

Narita

et al. 2009

Applied Thermal Engineering

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“…This simulation code is based on the finite element method and is widely used in the fields of groundwater movement and pollution. It can be used to analyze the transfer of geothermal and groundwater within the soil [20]. The simulation model was built by three-dimensional modeling that satisfies three laws, namely conservation of mass (Equation (1)), conservation of momentum (Equation ((2)), and conservation of energy (Equation ((3)), which classify the ground with three phases of solid, liquid and gas [21].…”

Section: Overview Of the Simulationmentioning

confidence: 99%

Feasibility Study of Ground Source Heat Pump System Considering Underground Thermal Properties

2018

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Abstract:A typical ground source heat pump (GSHP) system in South Korea has a ground heat exchanger (GHX) with a length of 100-150 m, which utilizes annually stable underground temperature to meet the loads of cooling, heating and hot water in buildings. However, most GSHP systems have been introduced in heating dominated areas because the system performance advantage is larger compared with air source heat pump system than that in cooling dominated areas. To effectively provide geothermal energy to the building in the limited urban area, it is necessary to install deep GHXs. Despite its large capacity, there are few studies on GSHP system with deep GHX over 300 m. In this study, to estimate the performance of the GSHP system with deep GHX and evaluate its feasibility, numerical simulation was conducted. To quantitatively analyze heat transfer between soil and GHX, the coupled model with GHX model and ground heat and groundwater transfer model was used. Furthermore, the heat exchange rate and the source temperature were calculated according to the operation modes, the length of GHX, and soil conditions such as geothermal gradient and thermal conductivity. As a result, the total heat exchange rate of GHX with a length of 300 m heat exchanger was 12.62 kW, 173% that of a length of 150 m. Finally, it was found that the GSHP system with deep GHX has realistic possibility in good condition of geothermal gradient.

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“…The sensitivity of the loop outlet temperatures and heat exchange rates to hydrogeological, system and meteorological factors was analyzed over 6-month and 25-year operation periods by Dehkordi and Schincariol (2014) [30]. Long-term exploitation of BTES (10 years [32][33][34][35][36].…”

Section: Natural Heat Resources Regenerationmentioning

confidence: 99%

Natural and Artificial Methods for Regeneration of Heat Resources for Borehole Heat Exchangers to Enhance the Sustainability of Underground Thermal Storages: A Review

Śliwa

Rosen

2015

Sustainability

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Abstract:The concept of borehole heat exchanger (BHE) field exploitation is described, along with problems regarding the sustainability of heat resources in rock masses. A BHE field sometimes has problems with the stability of the heat carrier temperature during long-term exploitation. The main reason for this is an insufficient heat stream with which to transfer heat by conduction in rock. Possibilities for the regeneration of heat in rock masses, based on experiences at the Geoenergetics Laboratory (Drilling, Oil and Gas Faculty, AGH University of Science and Technology), are described.

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Optimizing the design of large-scale ground-coupled heat pump systems using groundwater and heat transport modeling

Cited by 78 publications

References 2 publications

Calculation algorithm of the temperatures for pipe arrangement of multiple ground heat exchangers

Calculation algorithm of the temperatures for pipe arrangement of multiple ground heat exchangers

Feasibility Study of Ground Source Heat Pump System Considering Underground Thermal Properties

Natural and Artificial Methods for Regeneration of Heat Resources for Borehole Heat Exchangers to Enhance the Sustainability of Underground Thermal Storages: A Review

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