Fatty acids as phase change materials: A review

Yuan, Yanping; Zhang, Nan; Tao, Wen‐Quan; Cao, Xiaoling; He, Ya-Ling

doi:10.1016/j.rser.2013.08.107

Cited by 593 publications

(256 citation statements)

References 108 publications

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“…A eutectic mixture of two or more fatty acids has a lower melting temperature (Oró et al 2012;Yuan et al 2014b). Equation (1) was developed by Li et al (2011) and links the component mass ratios to the melting temperature.…”

Section: Mass Ratio Of Ca-ma-pa Ternary Eutectic Mixturesmentioning

confidence: 99%

Effects of various types of graphite on the thermal conductivity and energy storage properties of ternary eutectic fatty acid-based composite as phase change material

Jebasingh¹

2016

Renewables

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Energy is the greatest challenge facing the environment. Energy efficiency can be improved by energy storage by management of distribution networks, thereby reducing cost and improving energy usage efficiency. This research investigated the energy efficiency achieved by adding various types of graphite (e.g., flake and amorphous) to organic-based ternary eutectic mixtures like capric acid (CA)-myristic acid (MA)-palmitic acid (PA)-based composite phase change materials (PCMs) under the assistance of ultrasonication to improve thermal properties for thermal energy storage. The graphite was surface modified under a Fresnel lens by using concentration of solar rays, then exfoliation of flake graphite by solar irradiation (xG-F) and exfoliation of amorphous graphite by microwave irradiation (xG-A). For each type of graphite exfoliation, ternary eutectic mixtures with mass concentrations of 5 wt% were prepared. The structure, thermal energy storage properties, and thermal stability of the composite PCM were investigated. Thermal conductivity of the samples in the liquid phase was measured using the transient line source method (KD2Pro). The thermal conductivity was increased by loading xG while energy storage properties were slightly decreased. Furthermore, CA-MA-PA + 5 % xG-F has a slightly modified phase change temperature and enthalpy of melting (T m = 17.5 °C; ΔH m = 143.7 J/g) and freezing (T f = 6.7 °C; ΔH f = 125.5 J/g); this PCM showed higher thermal conductivity of 0.170 W/(m K), representing an increase of up to 114 % relative to the parent material. On the basis of the above results, xG-A was cheaper than xG-F, but they decrease the energy storage capacity according to DSC results obtained at 2 °C/min. CA-MA-PA/xG-F has more potential for use in low temperature energy storage applications.

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Section: Mass Ratio Of Ca-ma-pa Ternary Eutectic Mixturesmentioning

confidence: 99%

Effects of various types of graphite on the thermal conductivity and energy storage properties of ternary eutectic fatty acid-based composite as phase change material

Jebasingh¹

2016

Renewables

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“…Details of thermal properties, applications, and limitations of fatty acids are discussed in [42] and those of sugar alcohols/polyols are found in [43,44].…”

Section: Characteristics Proprieties Of Pcmsmentioning

confidence: 99%

A Comprehensive Review of Thermal Energy Storage

2018

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Thermal energy storage (TES) is a technology that stocks thermal energy by heating or cooling a storage medium so that the stored energy can be used at a later time for heating and cooling applications and power generation. TES systems are used particularly in buildings and in industrial processes. This paper is focused on TES technologies that provide a way of valorizing solar heat and reducing the energy demand of buildings. The principles of several energy storage methods and calculation of storage capacities are described. Sensible heat storage technologies, including water tank, underground, and packed-bed storage methods, are briefly reviewed. Additionally, latent-heat storage systems associated with phase-change materials for use in solar heating/cooling of buildings, solar water heating, heat-pump systems, and concentrating solar power plants as well as thermo-chemical storage are discussed. Finally, cool thermal energy storage is also briefly reviewed and outstanding information on the performance and costs of TES systems are included.

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“…Thus, it is absolutely urgent to improve energy utilization efficiency and protect environment. Energy storage techniques are hopeful to solve these problems and make the thermal energy sources match the demands [1][2]. As the core of energy storage technology, phase change materials(PCMs) can effectively store or release a great amount of latent heat during the process of phase change.…”

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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Fatty acids as phase change materials: A review

Cited by 593 publications

References 108 publications

Effects of various types of graphite on the thermal conductivity and energy storage properties of ternary eutectic fatty acid-based composite as phase change material

Effects of various types of graphite on the thermal conductivity and energy storage properties of ternary eutectic fatty acid-based composite as phase change material

A Comprehensive Review of Thermal Energy Storage

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

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Fatty acids as phase change materials: A review

Cited by 593 publications

References 108 publications

Effects of various types of graphite on the thermal conductivity and energy storage properties of ternary eutectic fatty acid-based composite as phase change material

Effects of various types of graphite on the thermal conductivity and energy storage properties of ternary eutectic fatty acid-based composite as phase change material

A Comprehensive Review of Thermal Energy Storage

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

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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