Effects of different parameters on the discharging of double-layer PCM through the porous channel

Sefidan, Ali M.; Taghilou, Mohammad; Mohammadpour, M.; Sojoudi, Atta

doi:10.1016/j.applthermaleng.2017.05.131

Cited by 20 publications

(3 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…(5) Thermal resistance of aluminum walls cannot be ignored because their thickness is considerable, and conductive heat transfers through walls; (6) The Rayleigh number, defined as Ra = (gβ(∆T)r 3 )⁄αυ, is set at a fixed value of 10 6 . ∆T stands for the amplitude of bulk HHTF temperature, g is the gravitational acceleration, r is the radius of PCM container, β is thermal expansion coefficient, and υ and α are the kinematic viscosity and thermal diffusivity, respectively; (7) Super-cooling effects and viscous dissipation are negligible; (8) Volume change in PCMs due to phase change is insignificant; (9) In annulus walls, no slip boundary conditions are employed; (10) To simulate the phase change process, the enthalpy method is employed; (11) In order to evaluate the flow within the porous matrix, Brinkman-Forchheimerextended Darcy model is used [23]; (12) The PCM is saturated in homogeneous and isotropic porous matrix.…”

Section: Physical Model and Boundary Conditionsmentioning

confidence: 99%

“…Likewise, Zhao et al [22] investigated the phase transition of RT58 through a porous matrix and reported enhancements of 3-10-fold in heat transfer rate for various metal foam structures and materials. Sefidan et al [23] numerically investigated the effects of various parameters on the solidification process of a double-layer PCM inside a rectangular porous channel. The effects of medium porosity, eccentricity of inner and outer sections, wall temperature and various arrangements of PCMs were reported.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Modeling of Multi-Layer Phase Change Material in a Triplex Tube under Various Thermal Boundary Conditions

2022

Self Cite

View full text Add to dashboard Cite

Nowadays, limited energy resources face ever-growing demands of the modern world. One engineering approach to mitigate this problem which has received considerable attention in recent years is using latent heat thermal storage (LHTS) systems, a significant opportunity which is provided by phase change materials (PCMs). In the present study, a numerical investigation was devoted to estimate the simultaneous freezing and melting processes of a double-layer PCM in terms of heat transfer and fluid flow phenomena. A double-pipe cylindrical channel with two compartments, A and B, was considered for locating two PCMs of RT28 and RT35 in various arrangements. The inner and outer walls were exposed to both hot and cold heat transfer fluids (HHTFs and CHTFs, respectively) beginning with solid or liquid initial state, which led to solid–liquid phase change process through PCMs. The numerical simulation was handled by a two-dimensional finite volume method (FVM) with a fixed Rayleigh number of 106 in which conduction and convection heat transfer mechanisms are taken into account. The effects of employing double-layer PCM and their arrangements, inner and outer walls’ boundary conditions, and initial statuses of PCMs are discussed, and the details of the compared results are shown in the form of temperature and liquid fraction variations over time.

show abstract

Section: Physical Model and Boundary Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modeling of Multi-Layer Phase Change Material in a Triplex Tube under Various Thermal Boundary Conditions

2022

Self Cite

View full text Add to dashboard Cite

show abstract

“…There are three schemes for conserving thermal energy, the sensible, the latent, and the thermochemical TES 3 . The latent heat energy storage scheme (LHESS) is superior to the other forms of storing thermal energy due to these reasons 4 : (a) thermal energy is held at a constant temperature, 5 (b) the energy storage density of LHESS is higher than that of the others, 6 and (c) LHESS can operate in a large number of cycles without any significant limitation 7 . LHESS is mostly recommended in applications with space limitations since thermal energy can be stored 5–14 times greater than that of sensible heat storage materials 8,9 .…”

Section: Introductionmentioning

confidence: 99%

CFD analysis on optimizing the annular fin parameters toward an improved storage response in a triple‐tube containment system

Bahlekeh

Mohammed

Al‐Azzawi³

et al. 2022

Energy Science & Engineering

View full text Add to dashboard Cite

Due to the low thermal conductivity of the phase change material and low thermal diffusion inside the phase change material, this study seeks to improve the melting response of a triple-tube latent heat storage system via employing annular fins by optimizing their structural parameters, including the fin number, location, and dimensions. Natural convection effects are numerically evaluated considering different numbers and the locations of the fins, including fin numbers of 4, 10, 16, 20, and 30 in a vertical system orientation. The fins are attached to the inner and outer sides of the annulus, accommodating the phase change material between the inner and center tubes. The fins' number and location are identical on both sides of the annulus, and the volume of the fins is the same across all scenarios evaluated. The results show that the higher the number of fins used, the greater the heat communication between the fins and the phase change material layers in charge, resulting in faster melting and a higher rate of heat storage. Due to the limited natural convection effect and lower heat diffusion at the heat exchanger's bottom, an additional fin is added, and its thickness is assessed.The results show that the case with equal fin thickness, that is, both original fins and the new fin, performs the best performance compared with that for the cases with an added fin with thicknesses of 0.5, 1, and 2 mm. Eliminating an extra fin from the base of the system for the case with 30 fins increases the charging time by 53.3%, and reduces the heat storage rate by 44%. The overall melting time for the case with an added fin to the bottom is 1549 s for the case with 30 fins which is 85.8%, 34.2%, 18%, and 8.8% faster than the cases with 4, 10, 16, and 20 fins, respectively. This study reveals that further attention should be given to the position and number of annular fins to optimize the melting mechanism in phase-changing materials-based heat storage systems.

show abstract

Numerical analysis of solidification of PCM in a closed vertical cylinder for thermal energy storage applications

İzgi

Arslan

2020

Heat Mass Transfer

View full text Add to dashboard Cite

Effects of different parameters on the discharging of double-layer PCM through the porous channel

Cited by 20 publications

References 23 publications

Modeling of Multi-Layer Phase Change Material in a Triplex Tube under Various Thermal Boundary Conditions

Modeling of Multi-Layer Phase Change Material in a Triplex Tube under Various Thermal Boundary Conditions

CFD analysis on optimizing the annular fin parameters toward an improved storage response in a triple‐tube containment system

Numerical analysis of solidification of PCM in a closed vertical cylinder for thermal energy storage applications

Contact Info

Product

Resources

About