Experimental study of the hydraulic and thermal performances of nano-sized phase change emulsion in horizontal mini-tubes

Ma, Fei; Chen, J.; Zhang, P.

doi:10.1016/j.energy.2018.02.085

Cited by 37 publications

(5 citation statements)

References 25 publications

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“…11-14, no. [22][23][24]. The ability of surfactants to stabilize paraffin-in-water suspensions for a long time is determined by a hydrophilic functional group, such as Tween 60, and a moderately developed hydrophobic part of the diphilic molecule Span 80 (Table 5).…”

Section: Resultsmentioning

confidence: 99%

“…-Estimation of the optimal weight concentration of PCM, SAA, and nanoparticles for decreasing the subcooling effect, increasing PCS heat storage capacity and heat conductivity as well as the study of the properties of the obtained PCS [4][5][6][7][8][9][10][11][12][13][14], -Development of the systems for practical PCS applications [8,15,16], -Determination of optimal configuration of the heat exchangers for the heat transfer enhancement [10,[17][18][19][20][21][22][23][24][25], -Study of the heat transfer processes in PCS at natural and forced convections [17][18][19][20][21][22][23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

“…It was shown that the developed mathematical model agrees with the experimental results excepting PCSs based on 10% of PCM. According to the research works [18][19][20][21][22][23], the heat transfer characteristics are enhanced at the laminar forced convection in the phase change of PCSs. It was also revealed that the Nusselt number increases with the rise in the PCM concentration, Reynolds numbers [21] and with applying a coiled double-tube heat exchanger [19,20].…”

Section: Introductionmentioning

confidence: 99%

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Water-paraffin dispersion systems: manufacturing and application

et al. 2020

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The paper presents the study results of the stability and heat storage capacity of paraffin-in-water phase change suspensions (PCSs) obtained by the homogenization of paraffin and water in the developed rotary hydrodynamic homogenizer. The optimal concentration of components for obtaining stable paraffin-in-water suspensions is found. It is shown that the stable PCSs in the form of pastes, gels, and liquids can be obtained depending on the concentration of water, paraffin, and the surface active agent (SAA) as well as its type. In addition, the scheme of the solar heating system with the heat storage tank where the PCS functions both as the heat transfer fluid and the heat storage media is presented. It is shown that the use of PCS in the domestic solar heating system allowed the heat storage capacity of the storage tank to be increased by 25% as a result of the high fusion heat of paraffin and the high value of the water specific heat capacity. The estimation of the saving rate from applying fluid PCS as a heat storage medium is also presented and discussed.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Water-paraffin dispersion systems: manufacturing and application

et al. 2020

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“…(b) The emulsion PCMs in the slurry. (c) The PCMs nanocapsules in the slurry 18 . Thermophysical properties, such as viscosity and heat of fusion for emulsion consisting of organic PCM (RT10) and water, are described in a research paper by Shao et al 16 The thermophysical properties of nano‐sized particles of tetradecane, hexadecane, and octadecane as the dispersed PCM in water were the subject of the work of Kawanami et al 19 Paraffin flow properties in a laminar flow and the phenomenological model presented in Delgado et al 20 show that the measured heat transfer coefficient was about 3.5 to 5.5 times higher when a speed of 290 to 600 rpm was used in a PCM emulsion.…”

Section: Introductionmentioning

confidence: 99%

Intelligent modeling of rheological and thermophysical properties of nanoencapsulated PCM slurry

Jirandeh

Mohammadiun

et al. 2020

Heat Trans

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Nanoencapsulated phase change material slurries (NPCMS) combine properties of carried fluid and phase change material (PCM). Usage of NPCMS instead of water as a working fluid has a lot of advantages in many industrial fields. The costly and time-consuming determination of thermophysical properties of NPCMS through the experimental analysis led the current investigations to use soft computing methods like correlating, artificial neural network (ANN), and ant colony optimization (ACO R ). In this study, the application of ANN, empirical correlations, and ACO R for modeling the thermophysical properties of NPCM slurry, which has been synthesized through a facile and eco-friendly procedure, has been investigated. PCM nanocapsules have been synthesized using a miniemulsion polymerization method. Nancapsules consist of AP-25 as core and a Styrene shell, which is modified with graphene oxide nanosheets as an extra protective screen.The morphology and thermal properties of nanocapsules were characterized and analyzed, respectively. Results revealed that minimum average particle-size values result in a melting latent heat of 146.8 J/g. In case of NPCM slurry, the results showed that the thermal conductivity of MPCS decreased with particle concentration for the temperatures below the melting point. The NPCMS can be considered a Newtonian fluid within the test region (shear rate > 200/seconds and mass fraction < 0.25). The ANN-ACO R model consists of two neurons in the input layer, six neurons in the hidden layer, and two neurons in the output layer. The input layer consists of two nodes (PCM concentration and temperature) that correspond to parameters found essential and sufficient for thermophysical properties prediction. Upon comparison, the results show that the presented model, which is a combination of the ACO R algorithm and an artificial neural network, is compatible with experimental work. K E Y W O R D SANN modeling, ant colony, phase change material, slurry, thermophysical properties

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“…The review divided into two parts, one for the proposed new system, the other for the economic analysis of the original system. Ma et al [8] investigated the flow and heat transfer characteristics of a nanosized PCME in mini-tubes. The heat transfer performance of the PCME was better than that of water at a similar Reynolds number.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on Performance Comparison of Solar Water Heating-Phase Change Material System and Solar Water Heating System

et al. 2019

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Phase change material can be used as heat transfer fluid in the solar water heating system, which is the latest way to improve thermal efficiency. In this paper, graphene composite paraffin emulsion is used as heat transfer fluid in a solar water heating-phase change material (SWH-PCM) system. By comparing with the traditional solar water heating (SWH) system, the thermal performance characteristics of SWH-PCM system have been investigated experimentally. The SWH-PCM system has higher heat storage than the SWH system. The heat storage of SWH-PCM system and SWH system all increase with the increase of solar irradiance, while the thermal efficiency has the opposite trend. The flow rate has a greater influence on the thermal efficiency of SWH-PCM system than that of the SWH system. With the flow rate of 200 L/h, the thermal efficiency of SWH-PCM system is 14.21% higher than that of the SWH system. In summary, the SWH-PCM system is a promising solar water heating system with high heat storage and thermal efficiency.

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Experimental study of the hydraulic and thermal performances of nano-sized phase change emulsion in horizontal mini-tubes

Cited by 37 publications

References 25 publications

Water-paraffin dispersion systems: manufacturing and application

Water-paraffin dispersion systems: manufacturing and application

Intelligent modeling of rheological and thermophysical properties of nanoencapsulated PCM slurry

Experimental Investigation on Performance Comparison of Solar Water Heating-Phase Change Material System and Solar Water Heating System

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