Thermal properties and thermal conductivity enhancement of composite phase change material using sodium acetate trihydrate–urea/expanded graphite for radiant floor heating system

Fu, Wanwan; Zou, Ting; Liang, Xianghui; Wang, Shuangfeng; Gao, Xuenong; Zhang, Zhengguo; Fang, Yutang

doi:10.1016/j.applthermaleng.2018.04.102

Cited by 115 publications

(37 citation statements)

References 29 publications

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“…where ∆H CPCM and ∆H PCM are the latent heats of LA-TD-HD/EG CPCM and LA-TD-HD PCM, m CPCM and m PCM are the mass fractions of LA-TD-HD/EG CPCM and LA-TD-HD PCM, respectively. To determine the optimum absorption ratio of the LA-TD-HD mixture to EG, the mass fraction of EG with 1%, 2%, 3%, 4%, 5%, and 6% are prepared to investigate the absorption rate of the LA-TD-HD mixture in the filter paper [44,46]. As shown in Figure 6a, the prepared LA-TD-HD/EG CPCM samples are placed on the filter papers.…”

Section: The Optimum Mass Ratio Of La-td-hd To Egmentioning

confidence: 99%

Defrosting Performance Improvement of Air-Source Heat Pump Combined Refrigerant Direct-Condensation Radiant Floor Heating System with Phase Change Material

et al. 2020

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Traditional defrosting methods applied to solve frosting problems of air-source heat pumps operating in cold periods may reduce heat capacity of the system and decrease indoor thermal comfort. In order to improve the performance of air-source heat pump (ASHP) and maintain indoor temperature in defrosting conditions, an air-source heat pump combined with a refrigerant direct-condensation radiant floor heating system with phase change material is proposed and evaluated in this study. Two radiant floor heating terminals with and without composite phase change material modules were compared through experiments. A composite phase change material based on dodecanoic acid-tetradecanol-hexadecanol mixture and expanded graphite was investigated for this application. Experimental results indicate that both heat fluxes of two comparing terminals are higher than 70 W/m2 in heating condition. At the same time, the floor surface temperature, indoor air temperature, and heating capacity of the terminal with composite phase change material modules are higher than those without composite phase change material modules in defrosting condition. This suggests that the proposed system with composite phase change material modules can improve indoor thermal comfort in defrosting condition as well as satisfy the heating requirement in heating condition.

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Section: The Optimum Mass Ratio Of La-td-hd To Egmentioning

confidence: 99%

Defrosting Performance Improvement of Air-Source Heat Pump Combined Refrigerant Direct-Condensation Radiant Floor Heating System with Phase Change Material

et al. 2020

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“…Cheng et al 18 used paraffin, high-density polyethene and expanded graphite (EG) to prepare a shape-stabilized phase change material (SSPCM) with superior thermal conductivity and applied in a floor heating system. 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.…”

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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“…Xiao et al [12] designed copper foam/sodium acetate trihydrate PCM and found that the thermal conductivity was as high as 2.10 W/(m•K), which suggested that copper foam possessed the good property of thermal conductivity enhancement. Fu et al [13] 2 of 11 prepared sodium acetate trihydrate-urea/expanded graphite (EG) by physical mixing, and the heat conductivity was improved to 2.076 W/(m•K) from 0.6785, indicating that EG could effectively enhance the thermal conductivity. Cheng et al [14] improved the heat conductivity of tetradecanol from 0.481 to 1.463 W/(m•K) by adding carbon fiber and Cu powder.…”

Section: Introductionmentioning

confidence: 99%

“…Many porous materials were used to resolve the complicated PCM leakage due to capillary activity and surface tension during the process of solid-liquid transformation. Currently, the porous package matrix mainly includes diatomite [21,22], expanded perlite [23,24], expanded vermiculite [25], boron nitride foam [26], copper foam [12,27], and fumed silica [13,28,29]. Among them, the abundant pores of EG can not only adsorb PCMs effectively but also provide a lot of extra nucleation sites for heterogeneous nucleation of PCMs so as to reduce the supercooling degree.…”

Section: Introductionmentioning

confidence: 99%

Design of Eutectic Hydrated Salt Composite Phase Change Material with Cement for Thermal Energy Regulation of Buildings

Liu

Yang

et al. 2020

Materials

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An energy-efficient eutectic hydrated salt phase change material based on sodium carbonate decahydrate and disodium hydrogen phosphate dodecahydrate (SD) was prepared. Then, SD was encapsulated into expanded graphite (EG) to produce form-stable composite phase change materials (SD/E), which indicated a positive effect on preventing the leakage of SD, decreasing the supercooling and improving the thermal conductivity. SD/E was further tested for thermal efficiency by simulating the indoor environment with a house-like model which was composed of SD/E and magnesium oxychloride cement. The results showed an excellent thermal insulation effect. This exciting porous composite phase shift material reveals possible architectural applications because of the attractive thermos-physical properties of SD/E.

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Thermal properties and thermal conductivity enhancement of composite phase change material using sodium acetate trihydrate–urea/expanded graphite for radiant floor heating system

Cited by 115 publications

References 29 publications

Defrosting Performance Improvement of Air-Source Heat Pump Combined Refrigerant Direct-Condensation Radiant Floor Heating System with Phase Change Material

Defrosting Performance Improvement of Air-Source Heat Pump Combined Refrigerant Direct-Condensation Radiant Floor Heating System with Phase Change Material

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

Design of Eutectic Hydrated Salt Composite Phase Change Material with Cement for Thermal Energy Regulation of Buildings

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