Numerical Study to Optimize the Melting Process of Phase Change Material Coupled with Extra Fluid

Khademi, Alireza; Darbandi, Masoud; Schneider, G. E.

doi:10.2514/6.2020-1932

Cited by 9 publications

(4 citation statements)

References 23 publications

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“…The results of melting process for OA in presence of water with the boundary condition of a constant-heat flux wall (Fig. 3) had the same melting process with the numerical results of OA in presence of water with a two-dimensional rectangular enclosure with constant temperature boundary condition obtained by Khademi et al [18][19][20].…”

Section: Resultssupporting

confidence: 80%

Thermal Efficiency Improvement of Brayton Cycle in the Presence of Phase Change Material

Khademi¹,

Mehrjardi²,

Tiari³

et al. 2022

International Conference on Fluid Flow, Heat and Mass Transfer

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The objective of the present study was to improve the thermal efficiency of a Brayton cycle benefiting from the multiphase concepts of phase change in thermodynamics and incorporating it with a phase change material (PCM) melting system. This system could be alternatively used to decrease the temperature of intake air into the gas turbine and improve gas turbine efficiency. The present study investigated the presence of phase-change refrigeration storage. The complex system was modelled by a straightforward configuration of a rectangular cavity, which contained the phase change material with intermediate fluid. Reducing the temperature of the inlet air had a considerable impact on improving the thermal efficiency of the gas turbine cycles. In this study, a new cooling approach was proposed in which the intake air was cooled using a PCM-based heat exchanger along with an intake line. During the daylight hours, air moved over the phase change material, whose melting point was lower than the maximum temperature of the surrounding air. The melting process caused a decrease in surrounding air temperature before entering the compressor. Upon completion of the PCM melting, the necessary ambient air was taken from the surroundings utilizing conventional air inlet configurations. During the night-time, the ambient air was cooler, and the liquid PCM solidified. The temperature of the chosen PCM was lower than the maximum value of surrounding temperature. The numerical modelling of the PCM indicated that it was possible to reduce the temperature of the inlet air. The thermodynamic investigation of the results demonstrated that both the thermal efficiency and the power output increased at a specific surrounding temperature.

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Section: Resultssupporting

confidence: 80%

Thermal Efficiency Improvement of Brayton Cycle in the Presence of Phase Change Material

Khademi¹,

Mehrjardi²,

Tiari³

et al. 2022

International Conference on Fluid Flow, Heat and Mass Transfer

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“…Being relatively denser than OA, after a period of time nanofluid will descend in the container causing a faster melting process by melting the deeper parts of OA. With a comparison of the presented result with the simulations of Khademi et al [9,10] in which OA is melted in the presence of pure water in 29 minutes, it can be conducted that rate of charging can be accelerated when water is augmented with nanoparticles which means charging time can be reduced impressively and in this case by 4 minutes. Additionally, 111-4 exploited with nanoparticles, thermal properties of the water are enhanced and consequently more thermal energy can be stored in a shorter time.…”

Section: Resultsmentioning

confidence: 84%

Simulation of Phase Change Material Melting Process in Presence of Nanofluid as an Auxiliary Fluid

Khademi¹,

Mousemi²,

Parcheforosh³

et al. 2020

International Conference on Energy Harvesting, Storage, and Transfer

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“…Continuous efforts for improvement come with a good example in wind energy technology, which is also supported by the improvement in the research process, resulting in a significant achievement according to the energy mix that comes from renewable sources. Providing heat from waste is also suitable [1], since thermal is considered as the highest energy demand [2]. The utilization of alternative fuel, which is also supported by several concepts of innovative burner, allows it to be taken as a reliable alternative heat source, particularly for remote areas.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the operational curve for heat storage technology using n-octacosane/low-density as a binding material

Rahman,

Sulistyo,

Utomo

et al. 2024

EEJET

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Heat storage technology has a critical role for a number of applications involving renewable thermal energy (such as solar water heater). The application of wax (n-octacosane/OCT) as a medium for storing heat brings many positive influences for the system. However, the operational curve is undesirable for the OCT-based energy storage, which makes it necessary to use a binding material. The present work employed LD-class polymer (LDPE) and linear-LDPE as binding materials for OCT. The mixture is prepared through mechanical hot stirring, which comes into two categories: SOCT1 (OCT/LD) and SOCT2 (OCT/LLD). The assessment through the calorimetry method shows an increment in transition temperature for SOCT with a value of 2.1 °C and 5.5 °C. This contributes to the variation of fusion energy for solid-liquid change for both materials, which amounted to 132.05 J/g (SOCT1) and 113.4 J/g (SOCT2). Another assessment related to its chemical and structural phase demonstrates that SOCT has an identical structure to OCT, indicating that SOCT is mixed physically. At the operational level, SOCT is more optimal than OCT according to the indicator related to charge and discharge duration for energy exchange. SOCT1 demonstrates a short plateau line as the indication of a steady transition between 65.4–67.9 °C, while SOCT2 indicates the average heating rate, which is higher than for single OCT. The heat releasing curve for SOCT1 varies at a lower value between 1.92 °C/min and 0.77 °C/min, while SOCT2 has the lowest variation, which is only 0.17 °C/min. Moreover, the self-insulation for SOCT2 has the lowest rate, which is only 0.3 °C/min. The evaluation and analysis from this work show that SOCT is reliable to increase the operational curve of OCT and can be implemented for thermal systems

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Numerical Study to Optimize the Melting Process of Phase Change Material Coupled with Extra Fluid

Cited by 9 publications

References 23 publications

Thermal Efficiency Improvement of Brayton Cycle in the Presence of Phase Change Material

Thermal Efficiency Improvement of Brayton Cycle in the Presence of Phase Change Material

Simulation of Phase Change Material Melting Process in Presence of Nanofluid as an Auxiliary Fluid

Evaluation of the operational curve for heat storage technology using n-octacosane/low-density as a binding material

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