Fatty acids/1-dodecanol binary eutectic phase change materials for low temperature solar thermal applications: Design, development and thermal analysis

Kumar, R.; Vyas, Sumita; Dixit, Ambesh

doi:10.1016/j.solener.2017.07.082

Cited by 47 publications

(15 citation statements)

References 37 publications

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“…The time intervals used for temperature difference measurements are used to calculate the dimensionless characteristic time function f ( τ ), 46 which is defined as

f ((), τ) goodbreak= \frac{1}{{((), n ((), n goodbreak+ 1))}^{2}} ∙ \int_{0}^{τ} \frac{dσ}{σ^{2}} ([], \sum_{l = 1}^{n} l ({}, \sum_{p = 1}^{n} p ∙ \exp ((), \frac{- (l^{2} + p^{2})}{2 σ^{2} n^{2}}) ∙ I_{0} ((), \frac{l p}{2 σ^{2} n^{2}})))

where n is the number of spirals in sensor, I 0 is the modified Bessel function,

τ = \sqrt{α ∙ t} / r_{s}

\sqrt{t / Θ}

is characteristic time ratio, Θ = r s 2 /α represents the characteristic time of measurement, α is the thermal diffusivity of the sample and t is the total measurement of time for experiment. The increase in average temperature of sensor, while passing a constant current through the sensor is given by

\overset{normalΔ T ((), t)}{false} goodbreak= \frac{P_{0}}{π^{\frac{3}{2}} r_{s} k} f ((), τ)

where P 0 is the power output at the sensor, r s is the radius of the sensor, and k is thermal conductivity of sample.…”

Section: Resultsmentioning

confidence: 99%

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Enhanced thermal conductivity and shape stabilized LiNO₃‐NaCl eutectic/exfoliated graphite composite for thermal energy storage applications

2021

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LiNO 3 and NaCl salt mixtures are explored as phase change material (PCM) for thermal energy storage. We developed a process for synthesizing LiNO 3 and NaCl eutectic mixture at room temperature and found that eutectic mixture consists of 88.8 wt% LiNO 3 and 11.2 wt% NaCl salts. The latent heat and melting point of PCM are ~230 C and 302 kJ kg À1 . Thermal conductivity of eutectic composition is measured with transient plane source (TPS) technique and value is 0.8 W m À1 K À1 . We used thermochemically exfoliated graphite (ExG) in 5, 10, 15, and 20 wt% ratio with the developed eutectic to prepare PCM-ExG composites to enhance thermal conductivity of pristine eutectic PCM. The maximum thermal conductivity of these PCM-ExG composite PCMs is ~13.8 W m À1 K À1 for 20 wt% ExG and ~1400 kg m À3 density, ~16.5 times of pristine eutectic PCM. We observed that PCM-ExG composite containing ExG ≥ 15 wt% retains liquid PCM inside the ExG pores, useful to reduce leakage problem of thermal energy storage vessel. The high thermal conductivity, high latent heat of fusion and suitable melting point of LiNO 3 -NaCl eutectic PCM-ExG composite PCM make it suitable for solar thermal energy storage and industrial waste heat recovery applications.

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“…The time intervals used for temperature difference measurements are used to calculate the dimensionless characteristic time function f ( τ ), 46 which is defined as

f ((), τ) goodbreak= \frac{1}{{((), n ((), n goodbreak+ 1))}^{2}} ∙ \int_{0}^{τ} \frac{dσ}{σ^{2}} ([], \sum_{l = 1}^{n} l ({}, \sum_{p = 1}^{n} p ∙ \exp ((), \frac{- (l^{2} + p^{2})}{2 σ^{2} n^{2}}) ∙ I_{0} ((), \frac{l p}{2 σ^{2} n^{2}})))

where n is the number of spirals in sensor, I 0 is the modified Bessel function,

τ = \sqrt{α ∙ t} / r_{s}

\sqrt{t / Θ}

\overset{normalΔ T ((), t)}{false} goodbreak= \frac{P_{0}}{π^{\frac{3}{2}} r_{s} k} f ((), τ)

where P 0 is the power output at the sensor, r s is the radius of the sensor, and k is thermal conductivity of sample.…”

Section: Resultsmentioning

confidence: 99%

“…The time intervals used for temperature difference measurements are used to calculate the dimensionless characteristic time function f(τ), 46 which is defined as…”

Section: Thermal Conductivity Analysismentioning

confidence: 99%

Enhanced thermal conductivity and shape stabilized LiNO₃‐NaCl eutectic/exfoliated graphite composite for thermal energy storage applications

2021

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“…Organic materials have the advantage of low toxicity, low corrosion, economy and no phase separation compare to inorganic materials, and it can be used for energy storage systems with low melting temperature (< 150 ℃) [1]. Organic materials have been designed for textiles [2], cold storage [3], building materials [4,5], solar energy storage [6,7], lithium batteries [8,9], waste heat recovery [10,11], air conditioning [12], etc. At the same time, organic materials (paraffin, fatty acids, eutectic materials, etc.)…”

Section: Introduction *mentioning

confidence: 99%

Synthesis of Lauric-Myristic Acid/Activated Carbon Composite as a New Shape-Stabilized Energy Storage Material

Chen

Zhao

et al. 2022

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In this work, a new composite phase change material (CPCM) with lauric-myristic acid (LA-MA) eutectic as PCM and activated carbon (AC) was used as supporting material with four different mass ratios of 5.0:5.0, 5.5:4.5, 6.0:4.0, and 6.5:3.5, respectively. The properties and microstructure of LA-MA/AC were analyzed by some characterization methods. The results show that the composite process of LA-MA eutectic and AC was a simple physical mixing and no new chemical bonds were found. The fusion and freeze temperature, enthalpy of the samples were measured by differential scanning calorimetry (DSC), and the residual weight of the samples was analyzed by thermogravimeter (TGA). It was shown that the fusion and freeze temperature of LA-MA eutectic separately were 32.42 ℃ and 33.63 ℃, and its fusion enthalpy and freeze enthalpy were 152.64 J/g and 148.8 J/g, respectively. TGA data shows that the thermal stability of LA-MA eutectic was obviously improved by adding AC as a support material. The results of this study can be available for reference to solar energy storage applications.

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“…After 100 thermal cycles, there was 4.94% drop in LHF. Binary eutectic PCMs of different fatty acids with 1‐dodecanol was developed by Kumar et al The melting point and LHF of the eutectic mixture range from 15.9°C to 19°C and 183 J g −1 to 188 J g −1 , respectively. The prepared eutectic PCM can be used for building heating/cooling and other applications.…”

Section: Introductionmentioning

confidence: 99%

Preparation and thermal properties of lauric acid/myristyl alcohol as a novel binary eutectic phase change material for indoor thermal comfort

Chinnasamy

Saritha

2019

Energy Storage

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This work is about the preparation and studies on lauric acid‐ myristyl alcohol solid‐to‐liquid binary eutectic phase change material used for indoor thermal comfort. The binary eutectic mixture consisting of lauric acid (40%) and myristyl alcohol (60%) is prepared, and its thermal properties are investigated. From the differential scanning calorimetric results, it is evidenced that the developed phase change material (PCM) possesses a melting temperature and a latent heat of 21.3°C and 151.5 kJ kg−1, respectively. The freezing temperature and latent heat are 19.9°C and 151.6 kJ kg−1, respectively. The Fourier transform infrared (FT‐IR) spectroscopy results confirm that the eutectic PCM is chemically stable. The accelerated thermal cycling test proves that the developed eutectic PCM is thermally stable upto 1000 thermal cycles. The thermogravimetric results revealed that the degradation of developed eutectic PCM occurs at a temperature of 165°C, which is higher than the application temperature. Also, the results of corrosion test with the construction materials such as Cu, Al, and stainless steel are presented with necessary recommendations for using it in real‐time applications. The developed novel eutectic PCM has significant potential for using it in an indoor thermal comfort application.

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Fatty acids/1-dodecanol binary eutectic phase change materials for low temperature solar thermal applications: Design, development and thermal analysis

Cited by 47 publications

References 37 publications

Enhanced thermal conductivity and shape stabilized LiNO₃‐NaCl eutectic/exfoliated graphite composite for thermal energy storage applications

Enhanced thermal conductivity and shape stabilized LiNO₃‐NaCl eutectic/exfoliated graphite composite for thermal energy storage applications

Synthesis of Lauric-Myristic Acid/Activated Carbon Composite as a New Shape-Stabilized Energy Storage Material

Preparation and thermal properties of lauric acid/myristyl alcohol as a novel binary eutectic phase change material for indoor thermal comfort

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Fatty acids/1-dodecanol binary eutectic phase change materials for low temperature solar thermal applications: Design, development and thermal analysis

Cited by 47 publications

References 37 publications

Enhanced thermal conductivity and shape stabilized LiNO3‐NaCl eutectic/exfoliated graphite composite for thermal energy storage applications

Enhanced thermal conductivity and shape stabilized LiNO3‐NaCl eutectic/exfoliated graphite composite for thermal energy storage applications

Synthesis of Lauric-Myristic Acid/Activated Carbon Composite as a New Shape-Stabilized Energy Storage Material

Preparation and thermal properties of lauric acid/myristyl alcohol as a novel binary eutectic phase change material for indoor thermal comfort

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Product

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Enhanced thermal conductivity and shape stabilized LiNO₃‐NaCl eutectic/exfoliated graphite composite for thermal energy storage applications

Enhanced thermal conductivity and shape stabilized LiNO₃‐NaCl eutectic/exfoliated graphite composite for thermal energy storage applications