Numerical Investigations on Charging/Discharging Performance of a Novel Truncated Cone Thermal Energy Storage Tank on a Concentrated Solar Power System

Mao, Qianjun; Liu, Ning; Li, Peng

doi:10.1155/2019/1609234

Cited by 14 publications

(7 citation statements)

References 32 publications

(38 reference statements)

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“…Mao et al numerically investigated a novel truncated cone thermal energy storage unit with phase change material. This study has shown a significant decrease in the charging/discharging time in the case of truncated cone TES geometry compare to cylindrical TES [3]. Pourakabar and Darzi [4] numerically studied the possibility of heat transfer enhancement during the melting and solidification process in a cylindrical thermal energy storage unit.…”

Section: Introductionmentioning

confidence: 93%

Experimental Investigations on the Influence of Coil Arrangement on Melting/Solidification Processes

Andrzejczyk¹,

Kozak²,

Muszyński³

2020

Energies

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The latent heat thermal energy storage units are very popular because of their high energy density and almost close to constant temperature during the charging/discharging. In the present study has been proposed new shell-and-coil geometry with a shifted coil position to enhance the performance of phase change thermal magazine. The experimental investigations have been performed both for the melting and solidification process of coconut oil for constant wall temperature conditions. The experiments have been carried out for cylindrical as well as coil shape geometry of the TES unit. In the case of annular TES, the copper tube with outer diameter d = 10 mm and total length equal to 165 mm were used (4). In the case of shell-and-coil TES the coil has been also made of a copper tube but with an outer diameter d = 6 mm. The total length of the tube was 460 mm. However, the length of the tube element that has been used in the process of bending the coil had a total length equal to 360 mm. The rest of the tube was straight. The coil pitch was 15 mm and the outer coil diameter was 26 mm. The experiments have been conducted for the coil position at the top and the bottom of the tank. The results showed the influence of heat transfer geometry for phase change efficiency. The article presents the thermal characteristic of melting and solidification phenomena as well as their visual analysis. A significant impact of heat transfer geometry at the shape of the melting and solidification profile. The optimal performance has been achieved for shell-and-coil TES with a coil arranged at the top of the tank.

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Section: Introductionmentioning

confidence: 93%

Experimental Investigations on the Influence of Coil Arrangement on Melting/Solidification Processes

Andrzejczyk¹,

Kozak²,

Muszyński³

2020

Energies

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“…The heat energy (Q 2c ) gained by the PCM2 in the room model during the charging cycle represents the energy saving of PCM2, and can be estimated as follows [17]:…”

Section: Charging and Discharging Of Pcm Analysismentioning

confidence: 99%

“…A significant improvement in heat exchanger performance and a reduction in PCM melting time in the range of 27-46% were obtained with the change in heat transfer fluid temperature from 60 to 80 • C. The numerical modelling of charging and discharging cycles of phase change materials integrated with air heaters and solar systems is covered in several studies [17][18][19][20][21][22]. The charging and discharging behavior of different phase change materials placed in capsules with various geometries is simulated using computational fluid dynamic (CFD) analysis.…”

Section: Introductionmentioning

confidence: 99%

Energy Saving and Charging Discharging Characteristics of Multiple PCMs Subjected to Internal Air Flow

Hamad

2021

Fluids

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One essential utilization of phase change materials as energy storage materials is energy saving and temperature control in air conditioning and indirect solar air drying systems. This study presents an experimental investigation evaluating the characteristics and energy savings of multiple phase change materials subjected to internal flow in an air heating system during charging and discharging cycles. The experimental tests were conducted using a test rig consisting of two main parts, an air supply duct and a room model equipped with phase change materials (PCMs) placed in rectangular aluminum panels. Analysis of the results was based on three test cases: PCM1 (Paraffin wax) placed in the air duct was used alone in the first case; PCM2 (RT–42) placed in the room model was used alone in the second case; and in the third case, the two PCMs (PCM1 and PCM2) were used at the same time. The results revealed a significant improvement in the energy savings and room model temperature control for the air heating system incorporated with multiple PCMs compared with that of a single PCM. Complete melting during the charging cycle occurred at temperatures in the range of 57–60 °C for PCM1 and 38–43 °C for PCM2, respectively, thereby validating the reported PCMs’ melting–solidification results. Multiple PCMs maintained the room air temperature at the desired range of 35–45.2 °C in the air heating applications by minimizing the air temperature fluctuations. The augmentation in discharging time and improvement in the room model temperature using multiple PCMs were about 28.4% higher than those without the use of PCMs. The total energy saving using two PCMs was higher by about 29.5% and 46.7% compared with the use of PCM1 and PCM2, respectively. It can be concluded that multiple PCMs have revealed higher energy savings and thermal stability for the air heating system considered in the current study.

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“…Recently, Bayon [6] presented a brief review on advanced phase change materials for thermal storage. Furthermore, as opined by Mao et al [7], the effective expansion of a low-carbon economy has appeared an imperative option for creating a win-win condition of economic implementation and environment conservation across the world. PCMs-type cooling has been promoted as a successful solution because it can capture heat through devices and machines and store it for later application, including heating houses and offices [8].…”

Section: Introductionmentioning

confidence: 99%

Melting Characteristics of a Phase Change Material Mixed with Nano Particles of Cobalt Oxide Bounded in a Trapezoidal Structure

Ali¹,

Shaikh²,

Shah³

et al. 2022

Computer Modeling in Engineering &Amp; Sciences

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A novel trapezoidal design for storage of heat energy through melting of phase-change material (PCM) is investigated. Latent heat thermal energy storage system (LHTES) is a promising option to diminish mis-match between energy consumption and supply. For this purpose, Paraffin: Rubitherm-35 (RT35) material is successively melted in aluminum structure which is heated from one side and the other sides are kept adiabatic. Melting of PCM is observed experimentally and melt fronts are photographed for various time lengths. The fluid-solid module in COMSOL Multiphysics 5.4 has been utilized. The transient heat conduction with enthalpy function is hired. Simulations are carried out for enhancement of thermal conductivity through addition of nano-entities of cobalt oxide Co 3 O 4 . The melting time is notably reduced with inclusion of nano-entities to enhance thermal conductivity. The time spans for melt start and total melt in case of pure PCM are 375 and 4500 (s) respectively whereas for the nano mix case, these are 150 and 3000 s. Thus 33% shorter time length is noticed for charging of the PCM trapezoidal matrix with nano entities of Co 3 O 4 are mixed. The results from simulation and lab observations depict similar patterns and are in quite close comparison.

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Numerical Investigations on Charging/Discharging Performance of a Novel Truncated Cone Thermal Energy Storage Tank on a Concentrated Solar Power System

Cited by 14 publications

References 32 publications

Experimental Investigations on the Influence of Coil Arrangement on Melting/Solidification Processes

Experimental Investigations on the Influence of Coil Arrangement on Melting/Solidification Processes

Energy Saving and Charging Discharging Characteristics of Multiple PCMs Subjected to Internal Air Flow

Melting Characteristics of a Phase Change Material Mixed with Nano Particles of Cobalt Oxide Bounded in a Trapezoidal Structure

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