Thermophysical and chemical analysis of gneiss rock as low cost candidate material for thermal energy storage in concentrated solar power plants

Jemmal, Y.; Zari, Nadia; Maâroufi, Mohamed

doi:10.1016/j.solmat.2016.06.002

Cited by 68 publications

(28 citation statements)

References 21 publications

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“…The second most abundant composition is for silicon dioxide (SiO 2 ), which is an indication of the quartz content that can increase thermal conductivity. Besides increasing thermal conductivity, high amount of SiO 2 increases the compressive strength of the material . The iron(III) oxide (Fe 2 O 3 ) content is quite high (more than 10%).…”

Section: Resultsmentioning

confidence: 99%

“…Besides increasing thermal conductivity, high amount of SiO 2 increases the compressive strength of the material. 11 The iron(III) oxide (Fe 2 O 3 ) content is quite high (more than 10%). Also, the sample contains minor amounts of different oxides such as TiO 2 , MnO, MgO, BaO, and HgO.…”

Section: Xrf Measurementsmentioning

confidence: 99%

“…The specific heats of samples in this study are higher than the rocks (gneiss, rhyolite, marble, limestone) and inertized waste materials characterized as potential sensible heat TES materials in previous studies. [9][10][11][12][16][17][18][20][21][22]…”

Section: Dsc Measurementsmentioning

confidence: 99%

“…[6][7][8] Among the sensible heat storage materials for high temperature are aluminum silicate composite materials, silica rocks, quartz and basalt gravels, alumina beads, desert sands, and inertized products reported in previous solar power plant studies. [9][10][11][12] These materials can be costly and deplete the natural resources considering the large amounts needed for such applications in industry. Using cheap storage materials is essential for economical solutions that will boost the competitiveness of industries while reducing energy costs.…”

Section: Introductionmentioning

confidence: 99%

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Using demolition wastes from urban regeneration as sensible thermal energy storage material

Koçak

Paksoy

2019

Int J Energy Res

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Summary Efficient use of solar energy in industrial applications calls for a cost‐effective thermal energy storage (TES) system. Packed bed is a viable technology for high‐temperature TES applications. The packing material acting as the TES material has to be sustainable with favorable thermal properties and compatible with the heat transfer fluid. Demolition wastes—leftovers from urban regeneration projects—in many countries are a big burden economically and environmentally. This paper aims to investigate the potential of using demolition wastes as sensible thermal energy storage (STES) material in packed bed column for industrial solar applications below 300°C. STES material samples have been prepared using binding additives with demolition waste dust. Chemical composition, mechanical strength, and thermal analysis tests have been carried out to determine suitability of STES samples. The DSC results showed that new STES samples had average specific heat capacity of 1000 to 1460 J/kg C in temperature range of 100°C to 500°C. The samples were thermally stable until 750°C under TGA analysis. These results showed that demolition wastes are potential low‐cost sensible heat storage material for applications up to 750°C. Furthermore, valorization of demolition wastes as sensible heat storage material is a sustainable approach in reducing fossil fuel consumption of high‐temperature industrial applications and avoiding the use of natural resources as packing material.

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Section: Resultsmentioning

confidence: 99%

Section: Xrf Measurementsmentioning

confidence: 99%

Section: Dsc Measurementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Using demolition wastes from urban regeneration as sensible thermal energy storage material

Koçak

Paksoy

2019

Int J Energy Res

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“…Electricity is then generated by an electric generator which is driven by a steam turbine with the efficiency limited by the Carnot cycle [1]. Considerable research efforts have been conducted to improve the efficiency of the CSP system and make the cost of electricity comparable to that of the conventional fossil-fuel power plant, e.g., thermal energy storage [2,3], thermophotovoltaic heat engine [4] and even the natural draft dry cooling towers (NDDCTs) [5]. The current study focuses on the performance improvement of NDDCTs which may offer the only effective alternative as most CSPs are located in arid or semi-arid areas.…”

Section: Introductionmentioning

confidence: 99%

Selection of wetted media for pre-cooling of air entering natural draft dry cooling towers

Zhang

et al. 2017

Applied Thermal Engineering

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HighlightsFour wetted media were comparatively studied for future pre-cooling design.Characteristics of wetted media suitable for pre-cooling were summarized.Media with middle efficiencies and pressure drops are superior for pre-cooling.Cellulose7060 is most promising for pre-cooling the 120m-high NDDCT. AbstractThe performance of natural draft dry cooling towers (NDDCTs) can be improved by wetted-medium evaporative pre-cooling. However, the pre-cooling benefit is season dependent and is significantly affected by wetted media. To further investigate the effect of wetted medium type on pre-cooling performance, the current study simulates a pre-cooled NDDCT using two typical types of wetted media, i.e., film (Cellulose7060 and PVC1200) and trickle (Trickle125 and Trickle100). A MATLAB program was developed and was validated against published data. The model was then used to carry out case study of a 120m-high NDDCT pre-cooled using the selected wetted media with fixed thickness of 300mm. Both the medium performance and pre-cooled NDDCT performance were compared to recommend the characteristics of wetted media promising for evaporative pre-cooling. Simulation finds that the media with high or low cooling efficiencies and pressure drops are not promising for the studied pre-cooling case while those media with middle cooling efficiencies and pressure drops intend to produce much performance enhancement and Cellulose7060 is a representative of such kind of medium. For the 120m-high NDDCT, the wetted-medium pre-cooling can raise the heat rejection rate of the tower without pre-cooling from 45MW to 92 MW, 76 MW, 68 MW and 65MW by Cellulose7060, PVC1200, Trickle125 and Trickle100, respectively at ambient temperature of 50℃ and humidity of 20%.

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An experimental study on the performance evaluation of a combined sensible‐latent heat thermal energy storage

Suresh

Saini

2020

Intl J of Energy Research

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SummaryThermal energy storage (TES) is one of the significant technologies for reducing the discrepancy between ever‐increasing energy demand and utilization. Sensible and latent heat based TES concepts are the most widely implemented technologies for thermal applications. However, these two storage technologies have drawbacks of lower energy storage ability, higher thermocline degradation for sensible heat storage and lower thermal conductivity of the phase change material (PCM) causing higher charge and discharge times for latent heat storage. To counter these issues, a novel combined sensible‐latent heat storage system has been proposed. The concept of combined sensible‐latent thermal storage is to place the latent heat storage media above the sensible storage media in the storage container. In the present experimental study, an experimental investigation of the proposed storage system and conventional sensible storage system was performed during charge and discharge cycles. The proposed storage system used concrete spheres as sensible storage media and paraffin encapsulated capsules having the same diameter of 38 mm, as a latent heat storage media. A comparative assessment has been made for two different configurations based on temperature profile, storage capacity, charge and discharge times, energy transferred, and energy recovered. The experimental results reveal that the novel combined sensible‐latent heat storage has lower thermocline degradation during discharge and higher energy storage capacity relative to the sensible storage system. The discharge time and energy utilization is prolonged by adding the PCM capsules above the concrete spheres and also the temperature drop at outlet of the storage system has been reduced than the sensible storage. Based on the analysis, the novel combined sensible‐latent heat storage was found to have a better performance compared with the conventional sensible heat storage system.

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Thermophysical and chemical analysis of gneiss rock as low cost candidate material for thermal energy storage in concentrated solar power plants

Cited by 68 publications

References 21 publications

Using demolition wastes from urban regeneration as sensible thermal energy storage material

Using demolition wastes from urban regeneration as sensible thermal energy storage material

Selection of wetted media for pre-cooling of air entering natural draft dry cooling towers

An experimental study on the performance evaluation of a combined sensible‐latent heat thermal energy storage

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