Thermal properties enhancement and application of a novel sodium acetate trihydrate-formamide/expanded graphite shape-stabilized composite phase change material for electric radiant floor heating

Fang, Yutang; Ding, Yifan; Tang, Yufeng; Liang, Xianghui; Jin, Chengbin; Wang, Shuangfeng; Gao, Xuenong; Zhang, Zhengguo

doi:10.1016/j.applthermaleng.2019.01.069

Cited by 107 publications

(20 citation statements)

References 32 publications

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“…Li 100 studied nano‐graphite/paraffin PCM and found that after mixing NG randomly dispersed in paraffin, the thermal conductivity of composite PCM increased. Tangtang et al 101 studied the shape‐stable composite PCM (CPCM) of SAT‐form amide (FA)/EG through experiments, and prepared SAT‐FA/EG through a physical mixing method. They use CPCM for analog display, and the total thermal comfort time of the electric radiant floor heating system (ERFHS) with (CPCM) is longer (12.65 hours), which greatly exceeds the electric thermal comfort time without CPCM layer (1.836 hours).…”

Section: Pcms Used In Stcsmentioning

confidence: 99%

Review on solar collector systems integrated with phase‐change material thermal storage technology and their residential applications

Liu

Zhang

2021

Int J Energy Res

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This article reviews the design of solar phase-change energy storage systems and their applications in residential buildings. The solar thermal collection system has high heat collection efficiency, no pollution, and it is also widely used in the field of building heating. In order to improve the efficiency of the solar collector system, the researchers found that integrating phase-change materials (PCMs) into the solar thermal collector system can achieve this goal, but there will be a problem of PCM leakage. Some researchers have solved this problem by microencapsulating PCMs, the thermal conductivity and energy storage efficiency of the PCMs after microencapsulation will be greatly affected. Adjusting the solar collector to an appropriate inclination angle can achieve the highest heat collection efficiency. Choosing the PCM in the appropriate temperature zone can improve the system efficiency. For the separated solar collector system, the parts that need to be considered include the type of heat exchanger, the structure of the energy storage heat exchanger, the shape of the heat exchanger fins, the type of solar collector, and so on. All in all, coupling PCM into the solar collector system can improve energy efficiency reduce carbon emissions and have good economics, the maximum internal rate of return of solar collectors integrated with PCMs in residential and industrial applications is 22% and 17.2%.

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Section: Pcms Used In Stcsmentioning

confidence: 99%

Review on solar collector systems integrated with phase‐change material thermal storage technology and their residential applications

Liu

Zhang

2021

Int J Energy Res

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“…The thermal energy storage ratio of the floor is the ratio of the thermal energy released by the floor during the 16 h without heating using the thermal energy released by the floor heating system during the whole 24 h per day, which can be defined as equation (20).…”

Section: Calculation Conditions and Evaluating Indicatorsmentioning

confidence: 99%

“…Fu et al 19 developed a sodium acetate trihydrate-urea/EG composite phase change material (CPCM). This CPCM had a phase change temperature of 47.84 C, a high latent heat of 223.1 kJ/kg and a low supercooling degree of 1.54 C. Fang et al 20 prepared a novel SSPCM using sodium acetate trihydrate-formamide eutectic mixture as PCM and EG as supporting carrier and thermal conductivity enhancer. The electric radiant floor heating system with this SSPCM has an excellent performance in reducing indoor temperature fluctuation range and improving indoor comfort; therefore, it has a great potential for practical applications.…”

Section: Introductionmentioning

confidence: 99%

Numerical and experimental investigation on dynamic thermal performance of floor heating system with phase change material for thermal storage

Zhang

Yang

Wang

2020

Indoor and Built Environment

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The floor heating system with phase change materials (PCMs) for thermal storage is an effective approach to increase the floor thermal capacity and reduce indoor temperature fluctuation range. A two-dimensional numerical model of the floor heating system combined with PCM was developed to investigate its dynamic thermal performance in winter. To verify the reliability of the model, an experimental room was established in Beijing, China. The experiment results agreed well with the modelling results, which demonstrated that the numerical model was reliable. The effects of the phase change temperature, latent heat and thermal conductivity of PCM on the thermal performance of the floor were numerically investigated. The results showed that the phase change temperature and thermal conductivity of PCM had a significant influence on thermal comfort. At the same time, these two thermal physical parameters also played a critical role in improving the utilization rate of PCM. Conversely, the latent heat, in the range of 100 to 200 kJ/kg, had no obvious influence on the thermal performance of the floor. PCM with phase change temperature of 313 K was recommended, which could increase the average indoor temperature by 2.2 K, increase the thermal energy storage ratio by 12% and reduce indoor temperature fluctuation range by 2.2 K.

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“…Phase change materials (PCMs) for storing and releasing energy represent promising energy storage media to solve the mismatch between energy supply and demand [1][2][3][4][5][6]. In recent years, it has been widely used in the field of thermal energy storage, such as industrial waste heat recovery [7,8], building heating [9][10][11][12], as well as solar energy systems [13][14][15]. Inorganic salt hydrate PCMs are considered as promising candidates owing to their merits of high latent heat, non-flammability, constant phase change temperature, and low cost [16,17].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on Mechanism of Latent Heat Reduction of Sodium Acetate Trihydrate Phase Change Materials

Wang

et al. 2020

Materials

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Sodium acetate trihydrate (SAT) phase change material (PCM) has been well known for thermal energy storage due to its high latent heat and resource abundance. However, SAT suffers from severe latent heat reduction after heating and cooling cycles. Although a few of previous researches showed the reduction could be effectively inhibited by using thickeners, the mechanisms of the reduction process and thickeners’ inhibition have not been deeply explored till now. In this work, SAT modified by 5 wt.% nucleating agent of disodium hydrogen phosphate dodecahydrate (SAT/5 wt.% DSP) was prepared and 200 thermal cycles were carried out. The differential scanning calorimeter, Rheometer, X-ray diffractometry, and scanning electron microscope were used to investigate the extent of latent heat reduction, viscosity, phase composition and microstructure, respectively, and the infrared thermal imaging method was used to evaluate heat storage capacity. It was found that the latent heat of SAT/5 wt.% DSP dropped dramatically and the relative decrease in latent heat was measured to be 22.44%. The lower layer of SAT/5 wt.% DSP contained 24.1 wt.% CH3COONa, which was quantitatively consistent with the reduction extent. Furthermore, the phase change endothermic time of the lower layer was only 44.1% of that of the upper. SAT/5 wt.% DSP was further modified by 3 wt.% thickener of carboxymethyl cellulose (SAT/5 wt.% DSP/3 wt.% CMC) and endured 200 thermal cycles. The extent of the latent heat reduction of SAT/5 wt.% DSP/3 wt.% CMC was only 9.29%, and phase compositions were more homogeneous. The 3 wt.% CMC increased viscosity by 14 times, which effectively prevented the Stokes sedimentation velocity of CH3COONa in melts and inhibited the final macroscopic phase separation.

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Thermal properties enhancement and application of a novel sodium acetate trihydrate-formamide/expanded graphite shape-stabilized composite phase change material for electric radiant floor heating

Cited by 107 publications

References 32 publications

Review on solar collector systems integrated with phase‐change material thermal storage technology and their residential applications

Review on solar collector systems integrated with phase‐change material thermal storage technology and their residential applications

Numerical and experimental investigation on dynamic thermal performance of floor heating system with phase change material for thermal storage

Experimental Investigation on Mechanism of Latent Heat Reduction of Sodium Acetate Trihydrate Phase Change Materials

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