Melting process of various phase change materials in presence of auxiliary fluid with sinusoidal wall temperature

Mehrjardi, Seyed Ali Abtahi; Khademi, Alireza; Ushak, Svetlana; Alotaibi, Sorour

doi:10.1016/j.est.2022.104779

Cited by 24 publications

(2 citation statements)

References 40 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: 81%

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: 81%

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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“…Thus, it has achieved a commercial-stage which makes the system's cost highly affordable. Improvement in the storage capacity for the TES can be taken by using phase change material (PCM) [5]. It allows the system to store a better energy capacity than the sensible system [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Superior Long-Term Performance of Composite Phase Change Material with High-Density Polyethylene under Thermal Aging Process

Suyitno¹,

Rahmalina²,

Ismail³

et al. 2023

RCMA

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Protecting the phase change material (PCM) from thermal aging is done by using polyethylene (high-density/HDPE) as supporting matrix. The HDPE content is set at 5 wt%, 10 wt% and 15 wt%. The composite PCM (cPCM) is treated through repeating melting/solidification process up to 10,000 cycles which is conducted between temperature 55℃-65℃. The thermal capacity of the paraffin wax (PW) is reduced notably, where enthalpy of fusion is decreased from 145.92 J/g to 138.46 J/g. The cPCM with 10 wt% and 15 wt% HDPE maintain a notable performance with only reduces slightly from 130.7 J/g to 129.7 J/g and 127.7 J/g to 127.2 J/g, respectively. The supercooling degree of PW increases around 1.64℃, which accelerates the cooling rate to 4.81℃/min. The HDPE in the cPCM maintain the physical behavior of PW, which minimizes the shrinkage effect during solidification. The highest heating rate is found at 2.29℃/min with minor decrement (0.06℃/min) for cPCM 15 wt% HDPE after treatment. The finding from this work can be used for fundamental basis to develop a high cycle PCM which able to operate at extended cycle with minor supercooling degree that is suitable for temperature sensitive operation.

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Effect of elliptical dimples on heat transfer performance in a shell and tube heat exchanger

Mehrjardi¹,

Khademi

Said

et al. 2023

Heat Mass Transfer

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Melting process of various phase change materials in presence of auxiliary fluid with sinusoidal wall temperature

Cited by 24 publications

References 40 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

Superior Long-Term Performance of Composite Phase Change Material with High-Density Polyethylene under Thermal Aging Process

Effect of elliptical dimples on heat transfer performance in a shell and tube heat exchanger

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