Numerical study of an Evacuated Tube Solar Collector incorporating a Nano-PCM as a latent heat storage system

Elarem, Raja; Alqahtani, Talal; Mellouli, Sofiene; Aich, Walid; Khedher, Nidhal Ben; Kolsi, Lioua; Jemni, Abdelmajid

doi:10.1016/j.csite.2021.100859

Cited by 87 publications

(10 citation statements)

References 27 publications

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“…Energy storage technology is one of the effective methods to solve the energy crisis, and it has broad application prospects in the fields of shifting peaks and valleys of power, solar energy utilization, industrial waste heat recycling, building heating, and air conditioning. − Thermal energy storage can generally be divided into chemical energy storage, − sensible heat storage, and latent heat storage. , Latent heat storage has many advantages, including high energy storage density, low temperature change, excellent material stability, and high safety, so it has received a significant amount of attention and application. − Fatty acids have attracted much attention for their appropriate phase change temperature, high phase change latent heat, nontoxicity, noncorrosiveness, no or small volume change, small degree of subcooling, good thermal reliability, abundant raw materials, easily obtainable, and other advantages. , More importantly, two or more fatty acids can be mixed into a eutectic mixture according to the eutectic effect of fatty acids to reduce the phase change temperature and expand its temperature application range. , Although fatty acid eutectic mixtures have many advantages, they also have the disadvantages of poor thermal conductivity and easy leakage. − At present, the common method to solve these problems is to add materials with high thermal conductivity and porous structures to fatty acid PCMs. − Due to its low density, high thermal conductivity, and porous structure, expanded graphite (EG) is frequently utilized as a substrate material, which not only minimizes liquid leakage but also significantly improves the thermal conductivity of the PCMs. − …”

Section: Introductionmentioning

confidence: 99%

Preparation and Thermal Performance of Fatty Acid Binary Eutectic Mixture/Expanded Graphite Composites as Form-Stable Phase Change Materials for Thermal Energy Storage

Zhou

Xiao

2023

ACS Omega

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A series of fatty acid binary eutectic mixture/expanded graphite (FABEM/EG) composite phase change materials (CPCMs) were prepared by absorbing a liquid FABEM into the EG. The thermal properties, thermostability, and thermoreliability were determined by differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and thermal cycling tests, respectively. Fourier transform infrared spectrometry (FT-IR) and scanning electron microscopy (SEM) were used to analyze the chemical structure and microstructure, respectively. Thermal conductivity measurements and heat storage/release experiments were carried out to study the heat transfer performance. The DSC test results show that the phase transition temperatures and latent heat of these CPCMs are in the range of 17.8–55.2 °C and 134.9–176.2 J/g, respectively. FT-IR analysis indicates there is only a simple physical adsorption between EG and the PCM and no chemical reaction occurs. SEM results show that the fatty acid binary eutectic mixtures are well adsorbed in the pores of EG, and EG can provide a certain mechanical strength and prevent phase change materials from leaking. The thermal conductivity measurement and heat storage/release experiment show that the addition of EG greatly improves the thermal conductivities of the CPCMs. TGA test results and thermal cycle tests show that the CPCMs have excellent thermal stability and long-term cycling thermal reliability.

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Section: Introductionmentioning

confidence: 99%

Preparation and Thermal Performance of Fatty Acid Binary Eutectic Mixture/Expanded Graphite Composites as Form-Stable Phase Change Materials for Thermal Energy Storage

Zhou

Xiao

2023

ACS Omega

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“…Furthermore, using porous fins among the three studied nanoparticles leads to decreasing in the solidification time compared with using the nonporous fins. Elarem et al 25 studied a latent heat storage system including an evacuated tube solar collector containing a nano‐PCM and found integrating the solar parabolic trough reflector with PCM improves the efficiency of the system. Furthermore, the dimensions and arrangement of the fins are the fundamental factors impressing the melting time for paraffin.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of the shell configuration effect on the melting of various phase change materials in the presence of porous medium and non‐Newtonian fluid

Azarbarzin

Javaherdeh

2023

Heat Trans

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By considering the ability of phase change materials (PCMs) in the storage of energy, the melting of four types PCMs including RT22, RT26, RT35, and RT41 in a heat exchanger is examined in this research. The impact of various shell cross‐sectional configurations on the complete melting time of materials, temperature changes, and liquid fraction throughout the melting process are presented. It is assumed that the main heat transfer fluid in the tube is non‐Newtonian and the tube is filled with a porous medium. The enthalpy porosity manner is applied for simulating the process of phase change and the heat natural convection and conduction cases are discussed. On the basis of the obtained results, the decrease in complete melting time is about 20% compared with the absence of a porous medium in the circular cross‐section configuration. The shell configuration has a noticeable impact on the reduction of the required time for melting. In the square cross‐section configuration, RT22 has the lowest melting time, as well as RT41 has the longest melting time in the inverted triangular cross‐section configuration in which the maximum time difference for RT22 is about 77% less. So, the best cross‐section for the shortest complete melting time is square.

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“…Authors of 45 inquired the impact of kind of substance of extend surface and nanomaterial on the efficiency of solar unit and expressed that the presence of such techniques can considerably increase the melting of PCM. Zeng et al 46 inquired the impact of various sets of locations of a hole accumulated with paraffin.…”

Section: Introductionmentioning

confidence: 99%

Influence of nanoparticles on freezing inside container equipped with fins

Almarashi

Hussin

Mirparizi

et al. 2022

Sci Rep

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With loading of different shapes of nanoparticles, the solidification speed can be changed which was scrutinized in current work. Although the nanoparticles dispersion can decline the heat capacity, the conduction mode can be improved with such technique and changing the styles of nano-powders can alter the strength of conduction. The velocity terms were neglected in freezing, thus, the main equations include two equations with unsteady form for scalars of solid fraction and temperature. Grid adaption with position of ice front has been considered in simulations utilizing FEM. The upper sinusoidal and inner rectangular walls maintain cold temperature and freezing starts from these regions. Adding nanomaterial can expedite the process around 15.75% (for m = 4.8) and 29.8% (for m = 8.6). Also, utilizing particles with shapes of blade form can augment the freezing rate around 16.69%. The efficacy of m on freezing process rises around 4% with elevate of concentration of nanoparticles.

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Numerical study of an Evacuated Tube Solar Collector incorporating a Nano-PCM as a latent heat storage system

Cited by 87 publications

References 27 publications

Preparation and Thermal Performance of Fatty Acid Binary Eutectic Mixture/Expanded Graphite Composites as Form-Stable Phase Change Materials for Thermal Energy Storage

Preparation and Thermal Performance of Fatty Acid Binary Eutectic Mixture/Expanded Graphite Composites as Form-Stable Phase Change Materials for Thermal Energy Storage

Numerical investigation of the shell configuration effect on the melting of various phase change materials in the presence of porous medium and non‐Newtonian fluid

Influence of nanoparticles on freezing inside container equipped with fins

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