Thermal energy storage system using stearic acid as a phase change material

Sari, Alper; Kaygusuz, Kami̇l

doi:10.1016/s0038-092x(01)00075-5

Cited by 155 publications

(56 citation statements)

References 19 publications

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“…8,13,[15][16][17][18][19] Organic PCMs possess superior properties, such as good chemical and thermal stability, low toxicity, and insignicant supercooling and volume change during phase change processes. 20,21 Fatty alcohols, including 1-dodecanol, 1-tetradecanol, 1-hexadecanol, and 1-octadecanol, are the most common organic PCMs due to their large latent heat and adjustable phase change temperatures between 24 to 60 C. 14,17,22 The potential use of PCMs is limited due to a variety of issues.…”

Section: -14mentioning

confidence: 99%

Microencapsulation of 1-hexadecanol as a phase change material with reversible thermochromic properties

Shi

Zhang

et al. 2017

RSC Adv.

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Herein, a novel approach for generating a microencapsulated reversible thermochromic phase change material (RTPCM) is described. The system described uses a spirolactone derivative color former, phenolic hydroxyl compound color developer, and 1-hexadecanol as the phase change material and cosolvent. The microencapsulation is achieved by complex coacervation of modified gelatin containing vinyl groups and gum arabic. This is followed by the crosslinking reaction between vinyl groups on modified gelatin and a divinyl crosslinker and subsequent crosslinking reaction with glutaraldehyde to improve stability and encapsulation efficiency. The influence of various key parameters on properties of the microcapsules (encapsulation efficiency, morphology, and particle size) are reviewed including the substitution degree of vinyl groups on modified gelatin, the type and amount of divinyl crosslinkers, and the core/shell ratio. Thermal properties and reversible color reliability of the generated microcapsules were found to be stable after 100 thermal heating and cooling cycles. Such microcapsules are well suited for latent heat storage and as an indicator for the states of energy saturation and consumption in phase change material applications directly through color change.

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Section: -14mentioning

confidence: 99%

Microencapsulation of 1-hexadecanol as a phase change material with reversible thermochromic properties

Shi

Zhang

et al. 2017

RSC Adv.

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“…Recently, organic materials have been investigated as PCM [24,25]. Simultaneously, fatty acids have a relatively high latent heating and exhibit small volume changes during the phase transition [26]. Many commercial products contain fatty acids, and they are often subjected to thermal treatment during processing, storage, and preparation.…”

Section: Introductionmentioning

confidence: 99%

Temperature dependency of thermal conductivity of solid phases for fatty acids

Bayram

Aksöz

Maraşlı

2014

J Therm Anal Calorim

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Thermal conductivity variations with temperature of solid phases for lauric acid (LA), myristic acid (MA), pivalic acid (PA), and stearic acid (SA) have been measured with radial heat-flow method. Temperature dependencies of the thermal conductivity for same organic materials have been obtained by linear regression analysis. From graphs of thermal conductivity versus temperature, the thermal conductivity of solid phase at their melting temperature and temperature coefficients of thermal conductivity for LA, MA, PA, and SA have been found to be 0.37, 0.39, 0.23, and 0.35 W K -1 m -1 and 0.00935, 0.00446, 0.01095, and 0.00295 K -1 , respectively. The ratios of thermal conductivity of liquid phase to thermal conductivity of solid phase for LA, MA, PA, and SA have also been measured to be 0.52, 0.48, 0.25, and 0.59, respectively, with a Bridgman-type directional solidification apparatus.

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“…Fatty acids, such as stearic acid, palamitic acid, myristic acid, and lauric acid, are promising PCMs for LHS. Sari et al [2] studied experimentally the thermal performance and phase change stability of stearic acid as heat storage material. Sharma et al [3] conducted 1500 accelerated thermal cycle tests to study the changes in latent heat of fusion and melting temperature of commercial-grade acetamide, stearic acid, and paraffin wax.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Performances of Microcapsule Phase Change Material for Thermal Energy Storage

Fang

Liu

et al. 2010

Chem Eng & Technol

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Performances of microcapsule phase change material (MPCM) for thermal energy storage are investigated. The MPCM for thermal energy storage is prepared by a complex coacervation method with gelatin and acacia as wall materials and paraffin as core material in an emulsion system. A scanning electron microscope (SEM) was used to study the microstructure of the MPCM. In thermal analysis, a differential scanning calorimeter (DSC) was employed to determine the melting temperature, melting latent heat, solidification temperature, and solidification latent heat of the MPCM for thermal energy storage. The SEM micrograph indicates that the MPCM has been successfully synthesized and that the particle size of the MPCM is about 81 lm. The DSC output results show that the melting temperature of the MPCM is 52.05°C, the melting latent heat is 141.03 kJ/kg, the solidification temperature is 59.68°C, and the solidification latent heat is 121.59 kJ/kg. The results prove that the MPCM for thermal energy storage has a larger phase change latent heat and suitable phase change temperature, so it can be considered as an efficient thermal energy storage material for heat utilizing systems.

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Thermal energy storage system using stearic acid as a phase change material

Cited by 155 publications

References 19 publications

Microencapsulation of 1-hexadecanol as a phase change material with reversible thermochromic properties

Microencapsulation of 1-hexadecanol as a phase change material with reversible thermochromic properties

Temperature dependency of thermal conductivity of solid phases for fatty acids

Experimental Investigation of Performances of Microcapsule Phase Change Material for Thermal Energy Storage

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