Thermal properties of shape-stabilized phase change materials using fatty acid ester and exfoliated graphite nanoplatelets for saving energy in buildings

Wi, Seunghwan; Seo, Jungki; Jeong, Seung-hoon; Chang, Seong Jin; Kang, Yujin; Kim, Sumin

doi:10.1016/j.solmat.2015.06.040

Cited by 113 publications

(32 citation statements)

References 32 publications

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“…So we reason that the coconut oil and n-hexadecane did not join together chemically. In addition, by reviewing previous work [24,28], we confirmed the chemical …”

Section: Ft-ir Analysis Of the Fatty Acid Ester And Paraffin Based MIsupporting

confidence: 79%

“…Fatty acid ester PCM is coconut oil and paraffin PCM is n-hexadecane in this research. The melting point and latent heat capacity at solid-liquid melting of pure coconut oil are 26.78˝C and 110.4 J/g, and those of pure n-hexadecane are 20.84˝C and 254.7 J/g [23,24]. The coconut oil is obtained from the Korea Similac Corporation in Gyeonggi, South Korea, and the n-hexadecane is obtained from the Celsius Korea Corporation in Seoul, South Korea.…”

Section: Methodsmentioning

confidence: 99%

“…The Mixed SSPCMs appear to follow the tendency that the more coconut oil they contain, the greater the thermal conductivity because the pure coconut oil has larger thermal conductivity than pure n-hexadecane. The thermal conductivities of pure coconut oil and n-hexadecane are 0.321 and 0.154 W/mK, respectively [23,24]. The overall Mixed SSPCMs have larger thermal conductivities which are 284% higher than the pure PCMs.…”

Section: Thermal Conductivity Analysismentioning

confidence: 99%

“…stability of the PCMs in xGnP. According to [24,28], the FT-IR spectrum of coconut oil/xGnP and nhexadecane/xGnP SSPCMs is the same as the each pure PCMs. This means that there are not chemical incorporations between coconut oil and xGnP, and n-hexadecane and xGnP.…”

Section: Ft-ir Analysis Of the Fatty Acid Ester And Paraffin Based MImentioning

confidence: 99%

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Thermal Performance Evaluation of Fatty Acid Ester and Paraffin Based Mixed SSPCMs Using Exfoliated Graphite Nanoplatelets (xGnP)

et al. 2016

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Phase change materials (PCMs) have been used in various fields including the materials of buildings. In this research, mixed shape-stabilized PCMs (Mixed SSPCMs) were prepared by impregnating coconut oil and n-hexadecane into exfoliated graphite nanoplatelets (xGnP) through a vacuum impregnate method. Coconut oil is fatty acid ester PCM which is relatively economical in comparison to other PCMs, and n-hexadecane is paraffin PCM that has high latent heat capacity. Drawbacks include leakage in a liquid state and low thermal conductivity resolved by xGnP. When preparing Mixed SSPCMs, coconut oil and n-hexadecane were impregnated at different proportions, namely 70:30, 50:50, 30:70 wt %. Mixed SSPCMs were analyzed through SEM, FT-IR, DSC, TGA and TCi. As a result, we confirmed the microstructure, chemical stability, thermal properties, thermal stability and thermal conductivity of Mixed SSPCMs. Latent heat capacity of Mixed SSPCMs were 89.06, 104.30 and 124.50 J/g while those of SSPCMs containing single PCM were 82.34 and 96.40 J/g. Thermal conductivity of Mixed SSPCMs was more than 284% higher than that of pure coconut oil and n-hexadecane. Finally, we confirmed that coconut oil and n-hexadecane were impregnated into xGnP, and the Mixed SSPCMs have high thermal durability.

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“…So we reason that the coconut oil and n-hexadecane did not join together chemically. In addition, by reviewing previous work [24,28], we confirmed the chemical …”

Section: Ft-ir Analysis Of the Fatty Acid Ester And Paraffin Based MIsupporting

confidence: 79%

Section: Methodsmentioning

confidence: 99%

Section: Thermal Conductivity Analysismentioning

confidence: 99%

Section: Ft-ir Analysis Of the Fatty Acid Ester And Paraffin Based MImentioning

confidence: 99%

See 2 more Smart Citations

Thermal Performance Evaluation of Fatty Acid Ester and Paraffin Based Mixed SSPCMs Using Exfoliated Graphite Nanoplatelets (xGnP)

et al. 2016

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“…PCMs are divided into organic PCMs, inorganic PCMs and eutectic PCMs according to inherent properties of the materials [5]. Even though the investigation about the characteristics of organic PCMs is relatively mature [6][7][8][9], high cost, low thermal conductivity and in flammability become the vital factors which restrain extensively practical applications. Inorganic hydrated salts, as the behalf of inorganic PCMs, have become a hot area of research due to their low cost, easy availability, non-flammability and high energy storage density.…”

Section: Introductionmentioning

confidence: 99%

Experimental studies on cycling stable characteristics of inorganic phase change material CaCl₂·6H₂O-MgCl₂·6H₂O modified with SrCl₂·6H₂O and CMC

Yang

Zhang

2018

IOP Conf. Ser.: Earth Environ. Sci.

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Abstract. By means of mass ratio method, binary eutectic hydrated salts inorganic phase change thermal energy storage system CaCl2·6H2O-20wt% MgCl2·6H2O was prepared, and through adding nucleating agent 1wt% SrCl2·6H2O and thickening agent 0.5wt% carboxy methyl cellulose (CMC), inoganic phase change material (PCM) modified was obtained. With recording cooling-melting curves simultaneously, this PCM was frozen and melted for 100 cycles under programmable temperature control. After per 10 cycles, the PCM was charaterized by differential scanning calorimeter (DSC), X-ray diffraction (XRD) and density meter, then analysing variation characteristics of phase change temperature, supercooling degree, superheat degree, latent heat, crystal structure and density with the increase of cycle index. The results showed that the average values of average phase change temperature for cooling and heating process were 25.70℃ and 27.39℃ respectively with small changes. The average values of average supercooling and superheat degree were 0.59℃ and 0.49℃ respectively, and the maximum value was 1.10℃. The average value and standard deviation of latent heat of fusion were 120.62 J/g and 1.90 J/g respectively. Nonmolten white solid sediments resulted from phase separation were tachyhydrite (CaMg2Cl6·12H2O), which was characterized by XRD. Measuring density of the PCM after per 10 cycles, and the results suggested that the total mass of tachyhydrite was limited. In summary, such modified inoganic PCM CaCl2·6H2O-20wt% MgCl2·6H2O-1wt% SrCl2·6H2O-0.5wt% CMC could stay excellent circulation stability within 100 cycles, and providing reference value in practical use.

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Latent Heat Thermal Energy Storage Systems with Solid–Liquid Phase Change Materials: A Review

Zhang¹,

Yuan²,

Cao³

et al. 2018

Adv Eng Mater

349

108

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This paper provides a review of the solid-liquid phase change materials (PCMs) for latent heat thermal energy storage (LHTES). The commonly used solid-liquid PCMs and their thermal properties are summarized here firstly. Two major drawbacks that seriously limit the application of PCMs in an LHTES system, that is, low thermal conductivity and liquid leakage, are discussed. Various methods for enhancing the thermal conductivity and heat transfer of solid-liquid PCMs are explained. Previous studies regarding formstable composite PCMs and microencapsulated PCMs are also presented. Furthermore, applications of the solid-liquid PCMs used in LHTES and thermal management systems are introduced and analyzed. Finally, future outlooks and research topics are proposed.

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Thermal properties of shape-stabilized phase change materials using fatty acid ester and exfoliated graphite nanoplatelets for saving energy in buildings

Cited by 113 publications

References 32 publications

Thermal Performance Evaluation of Fatty Acid Ester and Paraffin Based Mixed SSPCMs Using Exfoliated Graphite Nanoplatelets (xGnP)

Thermal Performance Evaluation of Fatty Acid Ester and Paraffin Based Mixed SSPCMs Using Exfoliated Graphite Nanoplatelets (xGnP)

Experimental studies on cycling stable characteristics of inorganic phase change material CaCl₂·6H₂O-MgCl₂·6H₂O modified with SrCl₂·6H₂O and CMC

Latent Heat Thermal Energy Storage Systems with Solid–Liquid Phase Change Materials: A Review

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Thermal properties of shape-stabilized phase change materials using fatty acid ester and exfoliated graphite nanoplatelets for saving energy in buildings

Cited by 113 publications

References 32 publications

Thermal Performance Evaluation of Fatty Acid Ester and Paraffin Based Mixed SSPCMs Using Exfoliated Graphite Nanoplatelets (xGnP)

Thermal Performance Evaluation of Fatty Acid Ester and Paraffin Based Mixed SSPCMs Using Exfoliated Graphite Nanoplatelets (xGnP)

Experimental studies on cycling stable characteristics of inorganic phase change material CaCl2·6H2O-MgCl2·6H2O modified with SrCl2·6H2O and CMC

Latent Heat Thermal Energy Storage Systems with Solid–Liquid Phase Change Materials: A Review

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Experimental studies on cycling stable characteristics of inorganic phase change material CaCl₂·6H₂O-MgCl₂·6H₂O modified with SrCl₂·6H₂O and CMC