A novel heat transfer model of a phase change material using in solar power plant

Mao, Qianjun; Chen, Hongzhang; Zhao, Yazhou; Wu, Hongjun

doi:10.1016/j.applthermaleng.2017.10.038

Cited by 37 publications

(18 citation statements)

References 17 publications

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“…It is important to describe the heat transfer characteristics in the process of phase transition and to obtain the temperature distribution of crude oil at different stoppage times. The research of wax and other phase change materials has been relatively mature [1][2][3][4][5], but for the complex component of crude oil, the phase change heat transfer research needs to be further developed.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation and analysis of phase change heat transfer in crude oil

Nie

Dai

et al. 2021

THERM SCI

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Accurately obtaining the temperature distribution of the medium in the shutdown pipeline of waxy crude oil has important guiding significance for making maintenance plan and restart plan.The phase transition process of waxy crude oil involves complex problems such as natural convection heat transfer, latent heat release, difficulty in tracing liquid-solid interface. In this paper, the concept and significance of breaking point were proposed. Taking the breaking point and the freezing point as dividing point, and a new zonal partition model was established based on the influence of phase change of crude oil wax crystal on heat transfer mode, with the corresponding governing equations being established for different regions. With the proposed model, the effects of natural convection on heat transfer, latent heat release, location change of condensate reservoir, heat transfer mechanism and other key issues in the process of oil phase transition were analyzed.

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Section: Introductionmentioning

confidence: 99%

Numerical simulation and analysis of phase change heat transfer in crude oil

Nie

Dai

et al. 2021

THERM SCI

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“…For example, Du et al 25 developed a novel form‐stable poly(ethylene glycol)‐based polyurethane phase change material doped by amino‐functionalized single‐walled carbon nanotubes, which exhibited good heat storage capacity. Particularly, paraffins as solid‐liquid phase change materials have drawn huge numbers of attentions due to their characteristics of non‐toxicity, non‐corrosiveness, minimal supercooling, good stability and the ability of absorbing or releasing larger latent heat energy during melting or crystallizing 26‐30 . Unfortunately, paraffins used directly as heat storage medium have disadvantages of irregular morphology and leakage in liquid state.…”

Section: Introductionmentioning

confidence: 99%

Photo‐thermal conversion and heat storage characteristics of multi‐walled carbon nanotubes dispersed magnetic phase change microcapsules slurry

et al. 2020

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Summary The development of high‐efficient working fluids with excellent photo‐thermal conversion and heat storage properties is an important factor to solar thermal utilization. In this work, magnetic phase change microcapsules (MPCMs) were prepared via in situ polymerization, where melamine‐formaldehyde (MF) resin and octadecane containing oleic acid‐coated magnetic nanoparticles (OA‐MNs) were used as the shell and core, respectively. The microstructure, magnetic and thermal properties of MPCMs were investigated, and the photo‐thermal conversion and heat storage properties of slurries prepared by dispersing MPCMs into multi‐walled carbon nanotubes (MWCNTs) nanofluids were explored. The encapsulation efficiency of MPCMs with superparamagnetic nature achieved 63.51%, while the thermal conductivity of MPCMs was slightly increased with regard to phase change microcapsules (PCMs) and the thermal stability of octadecane was enhanced after being encapsulated. Moreover, the slurry with 0.01 wt% MWCNTs and 15 wt% MPCMs had the optimal photo‐thermal conversion properties and thermal storage capacity. Beyond that, the recycled MPCMs represented excellent recyclability. Our research demonstrated that the MWCNTs‐dispersed MPCMs slurry is one of ideal working fluids with excellent photo‐thermal conversion and heat storage characteristics for direct absorption solar collector.

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“…The overall m value depends on the chemical composition, it is directly related to the emission source, and can be characterized by the typical particle modes, i.e., fine and coarse modes [8,[10][11][12]. For example, anthropogenic aerosols are mainly fine-mode particles composed of sulfate, organic carbon, or black carbon and generally exhibit strong light absorption characteristics [13][14][15][16]. However, natural aerosols on land are usually coarse-mode dust particles consisting of silicon dioxide and metal oxides and mainly exhibit strong light scattering but weak absorption characteristics [17,18].…”

Section: Introductionmentioning

confidence: 99%

Inferring Fine-Mode and Coarse-Mode Aerosol Complex Refractive Indices from AERONET Inversion Products over China

et al. 2019

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Detailed knowledge of the complex refractive indices (m) of fine- and coarse-mode aerosols is important for enhancing understanding of the effect of atmospheric aerosol on climate. However, studies on obtaining aerosol modal m values are particularly scarce. This study proposes a method for inferring m values of fine- and coarse-mode aerosol using the inversion products from the AERONET ground-based aerosol robotic network. By identifying the aerosol type, modal m values are constrained and then inferred based on a maximum likelihood method. Numerical tests showed that compared with the reference values, our method slightly overestimates the real parts of the refractive indices (n), but underestimates the imaginary parts (k) by 2.11% ± 11.59% and 8.4% ± 26.42% for fine and coarse modes, respectively. We applied this method to 21 AERONET sites around China, which yielded annual mean m values of (1.45 ± 0.04) + (0.0109 ± 0.0046)i and (1.53 ± 0.01) + (0.0039 ± 0.0011)i for fine- and coarse-mode aerosols, respectively. It is observed that the fine mode n decreased from 1.53 to 1.39 with increasing latitude, while fine mode k values were generally larger than 0.008 over most of China. The coarse-mode n and k ranged from 1.52 to 1.56 and from 0.002 to 0.006, respectively.

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A novel heat transfer model of a phase change material using in solar power plant

Cited by 37 publications

References 17 publications

Numerical simulation and analysis of phase change heat transfer in crude oil

Numerical simulation and analysis of phase change heat transfer in crude oil

Photo‐thermal conversion and heat storage characteristics of multi‐walled carbon nanotubes dispersed magnetic phase change microcapsules slurry

Inferring Fine-Mode and Coarse-Mode Aerosol Complex Refractive Indices from AERONET Inversion Products over China

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