Performance investigation of inclined CPV system with composites of PCM, metal foam and nanoparticles

Rahmanian, S.; Moein‐Jahromi, M.; Rahmanian‐Koushkaki, Hossein; Sopian, K.

doi:10.1016/j.solener.2021.10.088

Cited by 39 publications

(11 citation statements)

References 39 publications

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“…The cells number of each grid has been adopted so that the ratio of coarse grid size to that of medium equals the medium grid size to that of fine. This issue has been described in our previous paper in detail 36 . The time variation of PV layer temperature for the base case, Case 5, is indicated for the coarse, medium, and fine grid sizes in Figure 3A.…”

Section: Physical and Numerical Model Descriptionmentioning

confidence: 80%

“…This issue has been described in our previous paper in detail. 36 The time variation of PV layer temperature for the base case, Case 5, is indicated for the coarse, medium, and fine grid sizes in Figure 3A. The size of the time-step in the grid dependency study is considered 0.1 s. Based on Figure 3A, the solution outputs of these three grid sizes are close to each other, especially for the medium and fine ones.…”

Section: Numerical Proceduresmentioning

confidence: 84%

“…The details of numerical modeling are also presented in our previous paper. 36 The adopted assumptions in the current developed model are expressed as follow:…”

Section: Governing Equationsmentioning

confidence: 99%

“…Two energy transport equations are solved individually in the local thermal nonequilibrium (LTNE) model for both PCM and metal foam. The details of numerical modeling are also presented in our previous paper 36 . The adopted assumptions in the current developed model are expressed as follow: Density change follows the Boussinesq model, and it is effective for simulation of natural convection. The flow of the melted PCM in the foam pores is assumed laminar and incompressible, and volume expansion is neglected in the simulation. Linear distribution is considered for thermophysical properties of the PCM in the mushy zone to preserve the continuity of all properties. A homogeneous and isotropic pattern is applied for all metal foams. The viscosity of liquid PCM is considered temperature‐dependent. Due to the small pores size of the foams, a suitable contact is established between the ligaments of different segments in a gradient arrangement foam‐based heat sink.…”

Section: Physical and Numerical Model Descriptionmentioning

confidence: 99%

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Performance evaluation of concentrated photovoltaics with phase change materials embedded metal foam‐based heat sink using gradient strategy

Rahmanian‐Koushkaki

Rahmanian

Moein‐Jahromi

et al. 2022

Intl J of Energy Research

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A novel passive cooling heat sink for thermal regulation of concentrated photovoltaics (CPV) and its performance improvement based on phase change material (PCM) embedded in the metal foam has been introduced in this study. Eighteen different patterns have been considered for the heat sink to investigate the influence of series/parallel porosity gradient arrangement, foam material gradient, inclination angle, and pore density. A computational fluid dynamics simulation has been developed to analyze the transient heat charging mechanism and evaluate the effects of porosity/material gradient with different arrangements on the conduction/convection heat transfer processes in the foam-PCM-CPV. The results revealed that parallel positive porosity gradient in y-direction could enhance the natural convection and the conduction heat transfer compared to the series negative porosity gradient in the xdirection and reduce the time-average CPV temperature by 6.76 C and enhance the time-average electrical efficiency by 3.93%. The results also indicated that using an obtuse inclination angle instead of anacute one may reduce the CPV temperature by about 5 C and leads to an electrical efficiency improvement of 2.65%. The lower value of pore density is another determinative factor that could enhance the total absorbed heat by about 12% for different patterns.

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Section: Physical and Numerical Model Descriptionmentioning

confidence: 80%

Section: Numerical Proceduresmentioning

confidence: 84%

“…The details of numerical modeling are also presented in our previous paper. 36 The adopted assumptions in the current developed model are expressed as follow:…”

Section: Governing Equationsmentioning

confidence: 99%

Section: Physical and Numerical Model Descriptionmentioning

confidence: 99%

See 2 more Smart Citations

Performance evaluation of concentrated photovoltaics with phase change materials embedded metal foam‐based heat sink using gradient strategy

Rahmanian‐Koushkaki

Rahmanian

Moein‐Jahromi

et al. 2022

Intl J of Energy Research

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show abstract

“…Numerous practical and theoretical investigations on the performance of FP-SWH have been thoroughly published by Attia et al [1] and Rahmanian et al [2]. Esmaeili Shayan et al [3] reported on the experimental performance of a novel type of flat plate micro-heat pipe array solar water heater.…”

Section: Greek Symbol Introductionmentioning

confidence: 99%

Thermal Performance and Heat Dynamics Energy and Exergy of Integrated Asphalt Collector Storage: Sources of Thermal Energy, and Thermoelectric Energy

Shayan

Hayati

2023

IJEE

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Having kilometers of asphalt road, yet with this heat going to waste, an attempt has been made in this research to extract the road's renewable energy heat. The purpose of the experiment is to compare the energy and exergy efficiency of various materials of asphalt solar water heaters (ASWH), as well as heat transmission through the water tube and how friction affects exergy destruction. The water flow rate of one ASWH was 0.01 kg/s, while that of the other was 0.02 kg/s. Each ASWH has an area of 0.5 square meters. The copper tube is buried 10 mm deep in the asphalt. 15 degrees is the angle of inclination. The results indicate that the energy and exergy efficiencies are reasonably high for the water flow rate of 0.02 kg/s. Depending on the water flow rate, asphalt temperature, and sunlight intensity, the energy and exergy efficiencies changed from 32% to 65% and 5.8% to 16%, respectively. The water flow rate is an essential parameter for estimating the internal convective heat transfer coefficient and Reynolds number in order to calculate the friction factor in the copper tube based on internal convection heat transfer. In contrast, the friction factor is a consequence of the pressure loss and exergy degradation induced by friction.

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Numerical study on the effect of umbrella‐shaped fins in charging performance of a latent heat storage unit

Qiu

2022

Intl J of Energy Research

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Branch fins can expand the heat exchange area and uniformly release heat to each part of phase change material (PCM) domain. It has advantages in accelerating heat storage speed, but its structure is too complex. Based on these, a novel two-stage branch umbrella-shaped fin was designed in current research, which not only simplified the structure but also maintained the advantages of uniform heat distribution. The transient melting model of PCM in the umbrella-shaped fins latent heat storage unit was established and the numerical simulation was conducted. The influence of bifurcation number on melting was studied. Based on the optimal number of bifurcations, the non-uniform arrangement method was applied to further accelerate the melting of PCM, and the best optimal filling ratio was gotten. The results showed that as the bifurcations increased, the natural convection was weakened, and the thermal conduction was strengthened. When the bifurcation number was 4, the PCM melted more quickly and the temperature field was more homogeneous. Melting time can be reduced by 61% compared with straight fins. The heat conduction of PCM is weakened and the convection is strengthened with an increase in filling ratio. The melting speed of PCM first decreased and then increased. When the filling ratio was 345 , PCM had the fastest melting speed and the most uniform temperature field, and the melting time can be reduced by 9.6% compared with the uniform arrangement.

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Performance investigation of inclined CPV system with composites of PCM, metal foam and nanoparticles

Cited by 39 publications

References 39 publications

Performance evaluation of concentrated photovoltaics with phase change materials embedded metal foam‐based heat sink using gradient strategy

Performance evaluation of concentrated photovoltaics with phase change materials embedded metal foam‐based heat sink using gradient strategy

Thermal Performance and Heat Dynamics Energy and Exergy of Integrated Asphalt Collector Storage: Sources of Thermal Energy, and Thermoelectric Energy

Numerical study on the effect of umbrella‐shaped fins in charging performance of a latent heat storage unit

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