Advanced Energy Technologies
Mohamad Shafagati; Aziz Babapoor; MohammadAli Bamdezh
Abstract
This article investigates the utilization of thermal management systems for electric car applications and their optimization through the incorporation of phase change materials (PCMs) and nanoparticles (NPs). In recent years, with the expansion of the automobile sector and the introduction of electric ...
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This article investigates the utilization of thermal management systems for electric car applications and their optimization through the incorporation of phase change materials (PCMs) and nanoparticles (NPs). In recent years, with the expansion of the automobile sector and the introduction of electric vehicles (EVs) into the market, new challenges have emerged. One critical challenge is managing heat in lithium batteries, as the performance of these batteries can deteriorate significantly outside the normal temperature range. Consequently, this research delves into the reasons favoring passive thermal management systems over active ones in the electric vehicle industry. Additionally, it elucidates the motivations behind opting for active thermal management systems and explores research on various types of phase change materials (PCMs) utilized in this domain, along with the impact of nanoparticle additives. The objective is to comprehensively understand why researchers employ different types of phase change materials (PCMs) in this field and how these materials can influence battery cooling, including factors such as the thermal conductivity of PCMs. It also scrutinizes which materials and simulations have been proposed for these systems and assesses their potential applicability to other vehicle components, as several components of electric vehicles that remain unexamined in the literature become increasingly apparent. In conclusion, the proposal is considering the use of phase change materials in other automobile components.
Advanced Energy Technologies
Ala Moradi; Hajar Es-haghi; Seyed Hassan Hashemabadi; Majid Haghgoo; Zahra Emami
Abstract
Phase Change Materials (PCMs) have received much consideration as thermal energy storage systems due to their high storage capacity. However, their heat transfer rate is limited because of the low thermal conductivity. Incorporating of carbon-based nanoparticles into the matrix of PCMs with good dispersion ...
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Phase Change Materials (PCMs) have received much consideration as thermal energy storage systems due to their high storage capacity. However, their heat transfer rate is limited because of the low thermal conductivity. Incorporating of carbon-based nanoparticles into the matrix of PCMs with good dispersion can be an efficient way to solve their deficiency. In this research, graphite nanoparticles were homogeneously dispersed within the Eicosane PCM matrix to prepare a Nano-Enhanced PCM (NEPCM). The main objective is to determine the optimum amount of graphite to maximize the thermal properties of NEPCM composites. The Scanning Electron Microscopy (SEM) images of the prepared nanocomposites confirmed the excellent dispersion of graphite nanoparticles within the Eicosane layers through an ultrasonic bath-assisted homogenization procedure followed by solidification. In addition, Differential Scanning Calorimetry (DSC) and Thermal Conductivity Evaluation (TC) of the samples were conducted to determine their heat capacity and thermal diffusivity. The results illustrated that the more the number of graphite nanoparticles, the larger the number of collisions between graphite and Eicosane. As the nanoparticle content increased, the thermal conductivity and diffusivity were enhanced, as well. Numerically, the maximum thermal conductivity was 4.1 W/m K for the composite containing 10 wt% graphite, 15.66 times that of the pure Eicosane. Furthermore, increasing crystal growth and reducing heat capacity for the large number of nanoparticles in the composite were discussed. The significantly improved thermal properties of the prepared NEPCMs with an optimal nanoparticle content could make them applicable for different thermal management applications.
Advanced Energy Technologies
Seyed Amir Hassan Bathaei; Masoud Iranmanesh; Hossein Amiri; Hajir Kourki
Abstract
Thermal Energy Storage (TES) for solar thermal systems has attracted great attention because of the intermittent availability of solar energy. In the current paper, new combinations of several Phase Change Materials (PCMs) including a type of paraffin and some mineral compounds like ammonium nitrate ...
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Thermal Energy Storage (TES) for solar thermal systems has attracted great attention because of the intermittent availability of solar energy. In the current paper, new combinations of several Phase Change Materials (PCMs) including a type of paraffin and some mineral compounds like ammonium nitrate and magnesium nitrate hexahydrate were exanimated and their thermo-physical properties were compared. This study targets solar heating systems at different temperature intervals for the TES. Another new approach of this study is to determine the effect of Multi-Wall Carbon Nanotubes (MWCNTs) with two diameters (D) of 8 and 10-20 nm on paraffin's thermophysical property to improve these properties. An innovative method was used to measure Electrical Conductivity (EC) as it is easier to measure than thermal conductivity (K) to study the effect of nanoparticles on PCM behavior. The results showed that the highest values of improvement over paraffin properties were related to 5% nanoparticle additive for both nanoparticle diameters among the percentages studied. The addition of 5 % nanoparticles with 10-20 nm and 8 nm to paraffin at 25 ° C increased heat conductivity by 142% and 156%, respectively. The addition of nanoparticles to paraffin improved EC several times such that a diameter of 8 nm made a 300% increase in EC compared to 10-20 nm.
