Thermal energy storage assessment using a set of numerical indicators in terms of temperature contours, streamlines, liquid fraction and heat transfer coefficient. Abstract In this paper, two-dimensional CFD simulations were performed to simulate the melting process of a phase change material (PCM) filling a cylindrical cavity which …
Learn MoreWaste rock is dumped into the rockpit, forming a conic-shaped surface of the rock mass. Fig. 1b shows a 3D model of the rockpit – a large mass of broken rock – for seasonal thermal energy storage system of Creighton mine in Canada is proposed. This rockpit is assumed to be 697 m in diameter and 330 m deep [12]. Filling the pit with rocks ...
Learn MoreSection snippets Lunar heat storage system The construction of the lunar base heat storage system is the key to ensuring the energy demand for 14 Earth days during the lunar nighttime. Fig. 1 (a) represents the principle of …
Learn MoreFig. 13. Solar heating with STES project in Zhangjiakou. The large scale thermal energy storage became a rising concern in the last ten years. In the 1990s, the solar energy system coupled with ground source heat pump and STES ideas were proposed in China to solve the imbalance of cooling-heating load.
Learn MoreApplications of hydrogen energy. The positioning of hydrogen energy storage in the power system is different from electrochemical energy storage, mainly in the role of long-cycle, cross-seasonal, large-scale, in the power system "source-grid-load" has a rich application scenario, as shown in Fig. 11.
Learn MoreSmall numbers of successfully operating mine water geothermal and heat storage schemes have proved the concept of using this decarbonized energy source for heating and cooling of buildings (e.g. Springhill, Canada, Jessop 1995; USA, Watzlaf and Ackman 2006; Heerlen, Netherlands, Verhoeven et al. 2014; Asturias, Spain, Loredo et al. 2016; UK, …
Learn MoreThe thermal energy storage capacity per unit volume and cost of EP/P50/GP80 composite were also calculated as 1.95 ×107 kJ/m3 and 23.49 $/kJ. The thermal conductivity of EP/P50/GP80 composite ...
Learn More2. Model description Here, a 3D model of the rockpit â€" a large mass of broken rock - for seasonal thermal energy storage system of Creighton mine in Canada is proposed. This rockpit model is assumed to be placed over a cone- shaped mine pit which is 697 m in diameter and 330 m deep. Filling the pit with rocks has created a porous …
Learn MoreAs an energy basin, the Yellow River basin is a key demonstration area to promote energy system reform in China. There are a large number of abandoned mines in the Yellow River basin, which provide a new idea to build pumped storage power stations using abandoned mines (PSPSuM) for renewable energy storage.
Learn More1. Introduction. Thermal energy storage (TES) improvement using phase change materials (PCMs) has become a highly topical issue of major importance in the scientific research community, because the released works with regard to this field have increased [1], [2] during the last 20 years. It must be emphasized that research on the …
Learn MoreThe underground has proven to be the ideal thermal energy storage site as the influence of climate changes to the underground temperature is negligible and the widespread natural rock formations and water in underground have the advantage of low cost and huge capacity as thermal energy storage medium, ensuring the underground …
Learn MoreThermal energy storage (TES) is increasingly important due to the demand-supply challenge caused by the intermittency of renewable energy and waste heat dissipation to the environment. This paper discusses the fundamentals and novel applications of TES materials and identifies appropriate TES materials for particular …
Learn MoreOn the one hand, mine geothermal energy has many advantages as a kind of renewable clean energy, such as large reserves, small areas, low exploration costs, energy savings, and environmental ...
Learn Morefilling body for improving heat-storage performance in deep mine filling, when the filling body is also used as a structure supporting the underground stope space. Liu et al. [15] firstly proposed the
Learn Moreair-flow temperature in stope, on the heat-storage performance of filling body were analyzed. The findings provide a theoretical reference for the study of heat collection and …
Learn MoreBy repurposing disused mine shafts for energy storage, mine shafts can fill a productive function for up to 50 years beyond their original lifetime, and can mitigate decommissioning costs, while simultaneously creating …
Learn MoreRepurposing groundwater-filled mine cavities for thermal energy storage has demonstrated promising potential to buffer the imbalance of energy supply and …
Learn MoreTherefore, a regional integrated energy system was established, integrating renewable energy, energy storage, and power/thermal sharing between stations. A multi-objective optimization model for the regional integrated energy system was established, targeting economic benefits, carbon reduction, and reliability.
Learn MoreLang Liu currently works at the Energy School, Xi''an University of Science and Technology. He is a Professor, his research area is cemented paste backfill and functional backfill in
Learn MoreAfter the mine water passes through the compressor unit of the heat pump, the heating side produces an output heat energy of 11.7 MW, and the heat energy output of the air compressor side is 18.2 MW. The total heat is capable of heating a local building with an area of 429 000 m 2, based on a heat index of 70 W·m −2 for a …
Learn MoreAnna Engman, Co-Founder and CMO anna.engman@minestorage +46 70 632 62 95. About Mine Storage International. Mine Storage International was founded by a group of energy experts and renewable energy investors who joined forces to enable the green energy transition. The company''s business case is to build solutions for large …
Learn MoreThe compressed air energy storage in abandoned mines is considered one of the most promising large-scale energy storage technologies, through which the existing underground resources can be not ...
Learn MoreThe physical domain of this study, shown in Fig. 1 a, comprises a conic-shaped cavity in the ground, usually referred to as rockpit. Waste rock is dumped into the rockpit, forming a conic-shaped surface of the rock mass. Fig. 1 b shows a 3D model of the rockpit – a large mass of broken rock – for seasonal thermal energy storage system of …
Learn MoreAn Energy Swiss Army Knife. A mine storage supports the energy system in several ways, often simultaneously. It can act as energy storage, grid frequency regulator, capacity reserve, transmission support, inertia provider, or as a behind-the-meter solution to support large energy producers or energy-intensive industries.
Learn MoreFunctional thermal storage/energy storage backfill in mining refers to a backfilling mining method that takes into account the thermal/energy storage function while ... Energy-Dispersive X-ray Spectroscopy) observations of the micro-morphology. This study will provide a reference for the thermal energy storage filling in practical engineering ...
Learn MoreTurning abandoned mines into energy storage is one example of many solutions that exist around us, and we only need to change the way we deploy them," study co-author Behnam Zakeri said. A novel ...
Learn MoreThe filling slurry is transported through pipelines to the goaf, so that the heat-mining pipeline and the filling material are cured to form an integrated heat storage/energy storage functional backfill with good thermomechanical properties.
Learn MoreIntroduction. Thermal energy storage (TES) improvement using phase change materials (PCMs) has become a highly topical issue of major importance in the scientific research community, because the released works with regard to this field have increased [1], [2] during the last 20 years.
Learn MoreThe results indicate that selecting a rotational speed shifting time of 2000 s yielded the best melting performance for phase change heat storage, leading to a 17.37 % decrease in heat storage time and a 21.02 % improvement in the average variation rate of the liquid fraction and a significant 22.72 % enhancement in average thermal energy ...
Learn MoreFlooded mine workings can act as a thermal reservoir, with the potential to provide both heat recovery and heat storage, as required. The legacy of coal mining can thus be …
Learn MoreThe results obtained from the validated numerical model showed that energy storage system in an underground backfilled stope of a typical coal mine can …
Learn MoreProposed a phase change heat storage for geothermal–coal synergetic mining method. • The main factors affecting the working properties of the F-CBM were identified. • The aperture of F-CBM was concentrated in the …
Learn MoreUnderground thermal energy storage in mines is of sufficient scale to warrant more detailed research to better understand what the trade-offs and costs are of using them to store summer and waste heat. In particular, the re-use of coal mines to help support the UK in its transition to a low-carbon energy system provides a means to …
Learn MoreBy adding PCMs to filling body to store geothermal energy by latent heat, the heat-storage performance can be effectively enhanced. There are different ways to add PCMs to …
Learn MoreFurthermore, PCMs with large specific heat capacity and latent heat should be used to improve the energy storage effect. After 10 hours of heat storage/release, when the specific heat capacity ...
Learn MoreE-mail: liulang@xust .cn. backfill body, and it is gradually developing towards the improvement of heat exchanger and functional backfill materials. The existing mining mode of mineral resources has created a unique, complex, layered underground filling space interconnection network.
Learn MoreThe physical model of heat storage backfill body is shown in Fig. 1 this paper, the filling slurry was prepared with tailings from a gold mine in Shaanxi province, P.O42.5 Portland cement and water, the slurry concentration was 70% and the cement-tailing mass ratio was 1:4.
Learn MoreA phase-change material was added to filling materials in an appropriate proportion to realize the effective collection and storage of geothermal energy. Based on the theory of heat transfer and ...
Learn MoreInlet pressure and temperature data used to the high-pressure hydrogen gas charge analysis are shown in Fig. 1 (b). The ambient temperature and heat transfer coefficient on outer wall were set at 293.4 K and 10 W/m 2 K and the initial filling pressure was set at 9.3 MPa. The material properties of liner and laminate, which make up …
Learn MoreAbstract. The thermal performance of the ice-storage cooling device used in the underground mine refuge chamber is poor, which causes a waste of energy. Therefore, it is necessary to improve the heat transfer performance of ice latent heat storage devices. In the current work, the effects of fin height, fin thickness and number of …
Learn MoreAbstract. The thermal performance of the ice-storage cooling device used in the underground mine refuge chamber is poor, which causes a waste of energy. Therefore, it is necessary to improve the heat transfer performance of ice latent heat storage devices. In the current work, the effects of fin height, fin thickness and number of …
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