Feasibility study of D-mannitol as phase change material for thermal storage

Bayón, Rocío; Rojas, Esther

doi:10.3934/energy.2017.3.404

Cited by 27 publications

(20 citation statements)

References 15 publications

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“…It is replaced by a brownish pasty structure, typical of a caramelization process. Bayón and Rojas [14] also confirm the caramelization process and have identified a strong volatiles release followed by the polymerization of the solid material. The authors suggest that without a proper stabilization procedure of the material, either through encapsulation or through the formation of a composite structure, this material should not be used for thermal energy storage.…”

Section: The Phase Change Materialsmentioning

confidence: 61%

Some Heat Transfer Data for a Mannitol Derived Phase Change Material

Rocha¹,

Ferreira²,

Magalhães³

et al. 2020

REPQJ

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Heat transfer data for a commercial mannitol derivative, the Plus ICE A164, were obtained in a setup containing a heat exchanger with a single layer of three vertically placed pipes filled with the phase change material (PCM). This PCM has a fusion temperature about 168 ºC. The experimental procedure used an operating cycle composed by a heating and a cooling process, and the PCM temperature time evolution was measured. From these temperature results, the overall heat transfer coefficient, from the heat transfer fluid, a thermal oil, towards the PCM, was of 350 W/(m 2 K), while the average value for the PCM heat transfer coefficient was of 415 W/(m 2 K).

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Section: The Phase Change Materialsmentioning

confidence: 61%

Some Heat Transfer Data for a Mannitol Derived Phase Change Material

Rocha¹,

Ferreira²,

Magalhães³

et al. 2020

REPQJ

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“…Actually, according to mass variation (left axis), only 1% mass is lost at 290˝C, which indicates that 10-BPhCOOH is expected to be stable under Ar at least up to 40˝C above its clearing temperature (251˝C). However, as we observed for other PCMs [20], TG analyses performed at increasing temperature are not enough for thermal stability assessment and, in our opinion, they should at least be combined with TG studies at different constant temperatures.…”

Section: Resultsmentioning

confidence: 80%

Feasibility of Storing Latent Heat with Liquid Crystals. Proof of Concept at Lab Scale

et al. 2016

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Abstract:In this work, the first experimental results of thermotropic liquid crystals used as phase change materials for thermal storage are presented. For that purpose, the n = 10 derivative from the family of 4 1 -n-alkoxybiphenyl-4-carboxylic acids has been prepared. Different techniques like polarized-light microscopy, differential scanning calorimetry, thermogravimetric analysis and rheological measurements have been applied for its characterization. Having a mesophase/isotropic transition temperature around 251˝C, a clearing enthalpy of 55 kJ/kg, a thermal heat capacity of around 2.4 kJ/kg and a dynamic viscosity lower than 0.6 Pas, this compound fulfills the main requirements for being considered as latent heat storage material. Although further studies on thermal stability are necessary, the results already obtained are both promising and encouraging since they demonstrate de viability of this new application of liquid crystals as thermal storage media.

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“…However, even under this assumption, it is very clear that D‐mannitol degrades very quickly and cannot be used as a storage medium for any latent system that is expected to work during several years. Actually, Bayón and Rojas demonstrated that D‐mannitol degradation rate under conditions closer to the service ones is even higher than the rate obtained by Sagara et al…”

Section: Accelerated Life Testingmentioning

confidence: 74%

“…Another one is the work reported by Sagara et al, in which D‐mannitol was tested in a DSC apparatus at constant temperature above melting point and the variation of latent heat over time was used for obtaining the degradation kinetics. Bayón et al studied D‐mannitol degradation also at constant temperature ( T ph‐ch + 15°C), but in their case, ovens under either air or inert gas (N 2 or Ar) atmosphere were used . For monitoring degradation, they measured sample mass loss and analysed the remaining amount of D‐mannitol by HPLC, observing that this PCM degraded very quickly even under inert atmosphere.…”

Section: Accelerated Life Testingmentioning

confidence: 99%

“…Sometimes, a PCM is able to stand a certain number of consecutive cycles with almost no changes in the control properties, 59 but it degrades when it is kept melted for a while. 123 This is because, in the case of PCMs, temperature is usually the main degradation factor leading to chemical changes. In contrast, melting/freezing processes themselves are more likely to produce phase segregation or incongruent melting/freezing, which implies physical degradation.…”

Section: Preliminary Assessment Testsmentioning

confidence: 99%

See 1 more Smart Citation

Development of a new methodology for validating thermal storage media: Application to phase change materials

Bayón

Rojas

2019

Int J Energy Res

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Summary Long‐term stability and long‐term performance of thermal storage media are a key issue that should be thoroughly analysed when developing storage systems. However, no testing protocol or guideline exists up to now for validating storage media, so that authors apply their own criteria, not only for designing testing procedures but also for predicting the material behaviour under long‐term operation. This paper aims to cover this gap by proposing a methodology for validating thermal storage media; in particular, phase change materials (PCMs). This methodology consists of different stages that include PCM characterization, preliminary assessment tests, and accelerated life testing. For designing the accelerated life tests, lifetime relationship models have to be obtained in order to predict PCM long‐term behaviour under service conditions from shorter tests performed under stress conditions. The approach followed in this methodology will be valid for materials to be used as sensible or thermochemical storage media, too.

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Feasibility study of D-mannitol as phase change material for thermal storage

Cited by 27 publications

References 15 publications

Some Heat Transfer Data for a Mannitol Derived Phase Change Material

Some Heat Transfer Data for a Mannitol Derived Phase Change Material

Feasibility of Storing Latent Heat with Liquid Crystals. Proof of Concept at Lab Scale

Development of a new methodology for validating thermal storage media: Application to phase change materials

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