Feasibility Study on the Use of River Water Hydrothermal Energy in Korea : (1) Estimation of the Permitted Standard Discharge and Determination of the Potential Water Intake Area

Jung, Jaewon; Nam, Jisu; Jung, Sungeun; Kim, Jung-Wook; Kim, Hung Soo

doi:10.7849/ksnre.2018.12.14.4.027

Cited by 7 publications

(4 citation statements)

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“…For a river system to be viable for hydrothermal energy utilization, the stability of the river flow must be considered. Jung et al [29] identified rivers in Korea with sufficient water flow for hydrothermal applications. To examine possible intake areas, the permissible reference flow rate was calculated and sections of river that exceeded the reference flow rate were examined using geographic information system analysis to determine whether buildings that could benefit from hydrothermal heating and/or cooling were within 1 km of the river.…”

Section: Area Of Studymentioning

confidence: 99%

“…To examine possible intake areas, the permissible reference flow rate was calculated and sections of river that exceeded the reference flow rate were examined using geographic information system analysis to determine whether buildings that could benefit from hydrothermal heating and/or cooling were within 1 km of the river. With reference to the results of Jung et al [29] and based on the ease of data acquisition, the river reach from the Yangpyeong Stage Gauge to the Lower Namhan River Watershed of the Han River mainstream in the central Lower Namhan River Watershed was selected for analysis in this study. This section of the Lower Namhan River Watershed has a channel length of 60.81 km and a watershed area of 2,072.72 km 2 , accounting for 6.02% of the Han River Basin.…”

Section: Area Of Studymentioning

confidence: 99%

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Estimation of Temperature Recovery Distance and the Influence of Heat Pump Discharge on Fluvial Ecosystems

Jung¹,

Nam²,

Kim³

et al. 2020

Preprint

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Temperature differences between the atmosphere and river water allow rivers to be used as a hydrothermal energy source. The river-water heat pump system is a relatively non-invasive renewable energy source; however, effluent discharged from the heat pump can cause downstream temperature changes which may impact sensitive fluvial ecosystems. In this study, the water temperature recovery distance of the effluent was estimated for a river section in the Han River Basin, Korea, using the heat transfer equation and the Environmental Fluid Dynamic Code (EFDC) model. Results showed that, compared to the EFDC model, the heat transfer equation tended to overestimate the water temperature recovery distance due to its simplified assumptions. The water temperature recovery distance could also be used as an objective indicator to decide the reuse of downstream river water. Furthermore, as the river system was found to support an endangered fish species that is sensitive to water environment changes, care should be taken to exclude the habitats of protected species affected by water temperatures within water temperature recovery distance.

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Section: Area Of Studymentioning

confidence: 99%

Section: Area Of Studymentioning

confidence: 99%

Estimation of Temperature Recovery Distance and the Influence of Heat Pump Discharge on Fluvial Ecosystems

Jung¹,

Nam²,

Kim³

et al. 2020

Preprint

Self Cite

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“…There are two ways to determine the influence of effluent on a river system. This involves simulations using hydraulic and hydrological models or calculation of water temperature distribution using material balance equations [23]. In this study, the water temperature recovery distance was estimated using a heat transfer equation and the EFDC model.…”

Section: Estimation Of Water Temperature Recovery Distancementioning

confidence: 99%

Estimation of Temperature Recovery Distance and the Influence of Heat Pump Discharge on Fluvial Ecosystems

Jung

Nam²,

Kim

et al. 2020

Water

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Temperature differences between the atmosphere and river water allow rivers to be used as a hydrothermal energy source. River-water heat pump systems are a relatively non-invasive renewable energy source; however, effluent discharged from the heat pump can cause downstream temperature changes which may impact sensitive fluvial ecosystems. The temperature change associated with heat pump discharge in a river reach was examined using the heat transfer equation in a previous study, but not using models. There were also no studies on the impact of temperature change due to heat pump discharge on river ecosystem elements such as endangered fishes. Therefore, in this study, the water temperature recovery distance of effluent was estimated for a river section in the Han River Basin, Korea, using the heat transfer equation and the Environmental Fluid Dynamic Code (EFDC) model. The water temperature recovery distance was estimated to be 9.7 km using the heat transfer equation and 5 km using the EFDC model in summer. It was also estimated to be 4.5 km using the heat transfer equation and 6.7 km using the EFDC model in winter. Results showed that the water temperature recovery distance results estimated by the heat transfer equation had greater variation than the EFDC model. The water temperature recovery distance could also be used as an objective indicator to decide the reuse of downstream river water. Furthermore, as the river system was found to support an endangered fish species that is sensitive to water environment changes, care should be taken to exclude the habitats of protected species affected by water temperatures within water temperature recovery distance.

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“…Cornell University in the USA developed and utilized a 20000-RT cooling and heating system using pond water with a temperature range of 5-13 • C at a depth of 76 m that reduces the energy consumption by approximately 80% [16].…”

mentioning

confidence: 99%

Development of Design Method for River Water Source Heat Pump System Using an Optimization Algorithm

Kwon¹,

Bae²,

Nam³

2022

Energies

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River water source heat pump (RWSHP) systems are being proposed to reduce the energy consumption and carbon emissions of buildings. The RWSHP system is actively applied to large-scale buildings due to its stable performance. The application of RWSHP in large-scale facilities requires an accurate capacity design with considerations of building load, heat source, and environment conditions. However, most RWSHP systems are over-designed based on peak load of buildings. These design methods, based on peak loads, are economically and environmentally disadvantageous. Therefore, this paper aims to development an optimal design method, both economically and environmentally, for the RWSHP system. To develop this optimal design method, a simulation model was created with an optimization algorithm. The economics of the RWSHP system were calculated bases on present worth of annuity factor. Moreover, CO2 emissions were estimated using the life cycle climate performance proposed by the International Institute of Refrigeration. The total cost of the proposed RWSHP system that apply the optimum design method decreased by 24% compared to conventional RWSHP systems. Moreover, CO2 emissions of the proposed RWSHP system reduced by 4% compared to conventional RWSHP systems.

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Feasibility Study on the Use of River Water Hydrothermal Energy in Korea : (1) Estimation of the Permitted Standard Discharge and Determination of the Potential Water Intake Area

Cited by 7 publications

References 0 publications

Estimation of Temperature Recovery Distance and the Influence of Heat Pump Discharge on Fluvial Ecosystems

Estimation of Temperature Recovery Distance and the Influence of Heat Pump Discharge on Fluvial Ecosystems

Estimation of Temperature Recovery Distance and the Influence of Heat Pump Discharge on Fluvial Ecosystems

Development of Design Method for River Water Source Heat Pump System Using an Optimization Algorithm

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