Geothermal energy recovery from deep flooded copper mines for heating

Bao, Ting; Meldrum, Jay; Green, Christopher; Vitton, Stanley J.; Liu, Zhen; Bird, Kelsey

doi:10.1016/j.enconman.2019.01.007

Cited by 42 publications

(21 citation statements)

References 25 publications

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“…where E s is the static energy (kWh); h ¼ 2.7 Â 10 À4 is the unit conversion factor (kWh/kJ); c is the specific heat of the mine water, assumed to be 4.18 kJ kg À1 ( C) À1 ; T c is the mine water temperature after heat extraction via a tubular heat exchanger [34]; T h is the temperature of the mine water; and r is the density of the mine water (1,000 kg m À3 ). Considering an average mine water temperature of 21.6 C, and 5 C drop in mine water temperature, a geothermal energy reserve of 5.0 Â 10 7 kWh is estimated by applying Eq.…”

Section: Thermal Energy Reservementioning

confidence: 99%

“…The heat pumps were to be installed in the center of the thermal energy consumption. Table 4 also shows the number of residential customers that can be satisfied with this approach, considering 10,000 kWh year À1 for heating consumption [34]. An average mine water temperature of 21.6 C has been applied in the three connected mines under study.…”

Section: Geothermal Plants Designmentioning

confidence: 99%

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Feasibility analysis of using mine water from abandoned coal mines in Spain for heating and cooling of buildings

Menéndez¹,

Ordóñez

Oro

et al. 2020

Renewable Energy

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In 2017, renewable energy accounted for 19.5% of the total energy used for heating and cooling in the European Union. This paper analyses the technical and economic feasibility of using mine water from flooded underground coal mines in Spain to provide renewable thermal energy to buildings located in surrounding areas. High efficiency heat pump system is proposed to provide sustainable energy for district heating and cooling, leading to a reduction of greenhouse gas emissions to the atmosphere. The results obtained show that 20 MW of thermal energy is available for heat recovery from mine waters, compared to 4 MW of electrical power committed for pumping from inside the mines and heat pump consumption. The economic model that has been developed indicates that the feasibility of the geothermal plants depends on the amount of thermal energy demanded, the efficiency of the system and the distance from the abandoned mines to potential users. A mine water geothermal plant with 10 MW of power provides energy for about 1,700 households at a distance of 2 km with an investment cost of 3.25 MV. Regarding the reduction of CO 2 emissions, the emission factor is reduced to 0.048 kgCO 2 kWh À1 using this approach.

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Section: Thermal Energy Reservementioning

confidence: 99%

Section: Geothermal Plants Designmentioning

confidence: 99%

Feasibility analysis of using mine water from abandoned coal mines in Spain for heating and cooling of buildings

Menéndez¹,

Ordóñez

Oro

et al. 2020

Renewable Energy

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show abstract

“…As a consequence, and according to [81], thermal conductivity is directly correlated to mineralogy at Soultz. [83] shows the importance of such measurements to assess the energy reserve of a geothermal reservoir. From the above considerations [80], it appears that thermal conductivity combined with petrography, mineralogy and fracture analysis [6,20,33] might provide a good indication of potential present-day fluid flows occurring in altered granite zones.…”

Section: Integration Of Resultsmentioning

confidence: 99%

How Can Deep Geothermal Projects Provide Information on the Temperature Distribution in the Upper Rhine Graben? The Example of the Soultz-Sous-Forêts-Enhanced Geothermal System

Ledésert

Hébert

2020

Geosciences

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The Upper Rhine Graben (URG) hosts thermal anomalies that account for the development of oil fields. Recently, a geothermal power plant has been installed in this area. Data obtained in this framework provide an insight into the temperature distribution in the URG. The present thermal gradient at Soultz-sous-Forêts is not linear: nearly 90 °C/km down to 1400 m depth, then about 12 °C/km from that depth down to 5000 m. The combination of temperature conditions and natural fluid circulation in fracture networks has led to the hydrothermal alteration of the granite into mineral assemblages such as those including illite, quartz and calcite. Illite is locally impregnated with organic matter of two kinds: a mature type derived from oil source rocks and a less mature type derived from surficial sedimentary layers indicating the km-scale of transfer. Newly formed crystals of quartz and calcite from around 2000 m depth record a fluid temperature range of 130 to 170 °C, consistent with modelling and the temperatures measured at present in the drill-holes at this depth. In such hydrothermally altered zones, local variations of temperature are encountered indicating current fluid flows that are being sought for geothermal purposes.

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“…Fossil-fuel energy, which accounts for 87% of the market share, still dominates as the leading role of the world's energy consumption structure [1]. Among all kinds of fossil-fuel energy, coal consumption is the fastest growing [2][3][4]. With the over-exploitation of mines, the mining depth continuously increases [5].…”

Section: Introductionmentioning

confidence: 99%

Development of an Efficient Cooling Strategy in the Heading Face of Underground Mines

Xian

2020

Energies

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Heat damage in deep mines is severe and can lead to adverse health effects. The existing refrigeration schemes for the heading face in excavation roadways aim to cool the whole cooling region. However, the ratio of the area occupied by workers to that of the cooling region is quite small. A great quantity of energy for refrigeration is doomed to waste. In this study, a new cooling strategy for building a non-uniform environment in the heading face was developed. A certain quantity of well-designed tracking air coolers were distributed in the excavation roadway near the heading face. The air cooler tracked the constantly moving workers and blew cold air to them. Economic analysis based on estimation of the cooling load for this cooling strategy was conducted. The airflow in the excavation roadway was numerically simulated to estimate the cooling effect. An average energy saving of approximately 30% could be realized. The thermal environment for the workers whether near the heading face or in the roadway improved. This cooling strategy should be considered in all of mine cooling.

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Geothermal energy recovery from deep flooded copper mines for heating

Cited by 42 publications

References 25 publications

Feasibility analysis of using mine water from abandoned coal mines in Spain for heating and cooling of buildings

Feasibility analysis of using mine water from abandoned coal mines in Spain for heating and cooling of buildings

How Can Deep Geothermal Projects Provide Information on the Temperature Distribution in the Upper Rhine Graben? The Example of the Soultz-Sous-Forêts-Enhanced Geothermal System

Development of an Efficient Cooling Strategy in the Heading Face of Underground Mines

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