High thermal performance composite PCMs loading xGnP for application to building using radiant floor heating system

Jeon, Jisoo; Jeong, Seung-hoon; Lee, Jeong Hun; Seo, Jungki; Kim, Sumin

doi:10.1016/j.solmat.2012.02.028

Cited by 96 publications

(46 citation statements)

References 27 publications

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“…While the enthalpy values of the BASF products varied from 93 J/g to 103 J/g, the Rubitherm materials yielded the enthalpy in a range of 113-183 J/g. Enthalpy values similar to those shown in Table 4 were obtained, e.g., by J. Jeon et al 20 and X. Liu at al. 23 who obtained, for paraffinic waxes, enthalpies of fusion of 144.6 J/g and 153.5 J/g, respectively.…”

Section: Resultssupporting

confidence: 85%

“…In the past, bimodal shapes of DSC curves were found by other investigators as well. J. Jeon et al 20 reported on two phase-change peaks of paraffin. The first phase-change peak in the cooling process was high, corresponding to the liquid-solid transition of paraffin, but the second peak was much lower.…”

Section: Resultsmentioning

confidence: 99%

“…First, the paraffin underwent two phase transitions. 20,21 Second, due to the high cooling rate adopted for the DSC analysis, the super-cooling phenomena could also contribute to the appearance of the bimodal (or/and trimodal) shape of the DSC plots. 22 In Table 3, the enthalpies of fusion and crystallization in dependence on the heating and cooling rate are presented.…”

Section: Resultsmentioning

confidence: 99%

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Effect of the mode and dynamics of thermal processes on DSC-acquired phase-change temperature and latent heat of different kinds of PCM

Fořt¹,

Pavlík²,

Trník³

et al. 2017

Mater. Tehnol.

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Thermal-energy-storage systems utilizing phase-change materials (PCMs) can find use in many fields, such as solar-energy storage, waste-heat recovery or smart air conditioning in buildings. However, their incorporation into certain building elements and possible utilization of thermal energy are related to the proper understanding of phase-change processes. In this paper, thermophysical properties of five different PCMs were characterised in order to find suitable materials for incorporation into lightweight plasters capable of moderating the interior microclimate of buildings. A DSC analysis as the main investigation method was applied in the range of -10°C to 55°C, with the heating/cooling rates of (1, 5, 10 and 20)°C /min. Based on the DSC data, the temperatures and enthalpies of the phase change were determined as functions of both the modes and dynamics of the simulated thermal process. The obtained results were discussed and proper PCM candidates for an application in lightweight interior plasters were identified. Keywords: phase-change materials, differential scanning calorimetry, phase-change temperature Sistemi za skladi{~enje toplotne energije, ki izkori{~ajo fazne spremembe v materialih (angl. PCMs; Phase Change Materials), se uporabljajo na mnogih podro~jih, kot na primer pri pridobivanju in skladi{~enju son~ne energije, izkori{~anju odpadne toplote, ali v inteligentnih prezra~evalnih sistemih stavb. Kakorkoli, njihova vgradnja v dolo~ene gradbene elemente in mo`no izkori{~anje odpadne toplote, je povezana z ustreznim razumevanjem faznih sprememb. V tem prispevku so bile dolo~ene termo-fizikalne lastnosti petih razli~nih PC materialov, da bi na{li ustrezne materiale za vklju~itev v lahke omete, ki bi bili sposobni uravnavati notranjo mikroklimo stavb. Kot glavna preiskovalna metoda je bila uporabljena DSC (diferencialna vrsti~na kalorimetrija) analiza v temperaturnem obmo~ju med -10°C in 55°C, s hitrostjo ogrevanja/hlajenja (1, 5, 10 in 20)°C/min. Glede na podatke DSC-analize, so bile dolo~ene temperature in entalpije faznih sprememb v odvisnosti od obeh na~inov in dinamike simuliranega termi~nega procesa. Dobljeni rezultati so bili pre{tudirani in najdeni so bili ustrezni PCM-materiali za uporabo v lahkih notranjih ometih. Klju~ne besede: materiali s faznimi spremembami, diferen~na dinami~na kalorimetrija, temperatura fazne spremembe

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Section: Resultssupporting

confidence: 85%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Effect of the mode and dynamics of thermal processes on DSC-acquired phase-change temperature and latent heat of different kinds of PCM

Fořt¹,

Pavlík²,

Trník³

et al. 2017

Mater. Tehnol.

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“…Thermal properties of the Mixed SSPCMs, such as melting and freezing point and latent heat capacities, were analyzed by the differential scanning calorimetry (DSC, DSC-Q1000, TA instrument, New Castle, PA, USA). The melting and freezing point were measured by drawing a line at the point of maximum slope of the leading edge of the peak and extrapolating to the base line, and the latent heats of the Mixed SSPCMs were analyzed as total by numerical integration of the area under the peaks that represents the solid-solid and solid-liquid phase transition [17]. The DSC measurements were performed at a 3˝C/min heating and cooling rate and a temperature range of´20 to 80˝C.…”

Section: Characterization Techniquesmentioning

confidence: 99%

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

et al. 2016

Self Cite

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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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“…Despite the higher conductivity, compared to usual insulation materials used in buildings, PCM have been proved efficient in reducing peak heat fluxes by as much as 38% [14]. Indeed this property makes them ideal for passive heat storage in different building applications such as in the envelope of the building, in radiant floor heating systems, in free cooling systems, in photovoltaic elements and in building integrated PV [15][16][17][18][19][20][21][22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

On the Efficacy of PCM to Shave Peak Temperature of Crystalline Photovoltaic Panels: An FDM Model and Field Validation

Brano¹,

Ciulla²,

Piacentino³

et al. 2013

Energies

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Abstract:The exploitation of renewable energy sources and specifically photovoltaic (PV) devices have been showing significant growth; however, for a more effective development of this technology it is essential to have higher energy conversion performances. PV producers often declare a higher efficiency respect to real conditions and this deviation is mainly due to the difference between nominal and real temperature conditions of the PV. In order to improve the solar cell energy conversion efficiency many authors have proposed a methodology to keep the temperature of a PV system lower: a modified crystalline PV system built with a normal PV panel coupled with a Phase Change Material (PCM) heat storage device. In this paper a thermal model analysis of the crystalline PV-PCM system based on a theoretical study using finite difference approach is described. The authors developed an algorithm based on an explicit finite difference formulation of energy balance of the crystalline PV-PCM system. Two sets of recursive equations were developed for two types of spatial domains: a boundary domain and an internal domain. The reliability of the developed model is tested by a comparison with data coming from a test facility. The results of numerical simulations are in good agreement with experimental data.Keywords: phase change material; crystalline photovoltaic modules; heat storage; finite difference method; experimental validation

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High thermal performance composite PCMs loading xGnP for application to building using radiant floor heating system

Cited by 96 publications

References 27 publications

Effect of the mode and dynamics of thermal processes on DSC-acquired phase-change temperature and latent heat of different kinds of PCM

Effect of the mode and dynamics of thermal processes on DSC-acquired phase-change temperature and latent heat of different kinds of PCM

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

On the Efficacy of PCM to Shave Peak Temperature of Crystalline Photovoltaic Panels: An FDM Model and Field Validation

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