DSC test error of phase change material (PCM) and its influence on the simulation of the PCM floor

Guo, Feng; Huang, Kailiang; Xie, Hao; Li, Huixing; Liu, Xin; Liu, Shibo; Cao, Chihong

doi:10.1016/j.renene.2015.07.085

Cited by 54 publications

(20 citation statements)

References 17 publications

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“…Generally, with the increasing heating/ cooling rate, the phase-change-transition range was more spread; this feature was more remarkable for the materials based on dispersion. A similar PCM performance with respect to the heating rate applied in a DSC analysis was observed, e.g., by G. Feng et al 19 who analysed capric acid of high purity (³ 99.9 %) so that the influence of the material impurity on DSC results was neglected. G. Feng et al 19 applied heating rates of (10, 5, 1, 0.5 and 0.1)°C/min.…”

Section: Resultssupporting

confidence: 69%

“…A similar PCM performance with respect to the heating rate applied in a DSC analysis was observed, e.g., by G. Feng et al 19 who analysed capric acid of high purity (³ 99.9 %) so that the influence of the material impurity on DSC results was neglected. G. Feng et al 19 applied heating rates of (10, 5, 1, 0.5 and 0.1)°C/min. When the heating/cooling rate increased from 0.1°C/min to 10°C/min, the biggest deviations in solid-and liquid-transition temperatures were 1.1°C and 6.4°C, respectively.…”

Section: Resultssupporting

confidence: 69%

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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: 69%

Section: Resultssupporting

confidence: 69%

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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“…The principle of the technique has been introduced in detail in many previous studies such as Feng et al, Jelesarov and Bosshard, and Höhne and Hemminger [44][45][46]. Latent heat is the thermal energy released or captured during solidification or melting process.…”

Section: Measurement Of Latent Heatmentioning

confidence: 99%

“…DSC is commonly used in measuring the latent heat and other properties of PCMs. The principle of the technique has been introduced in detail in many previous studies such as Feng et al, Jelesarov and Bosshard, and Höhne and Hemminger [44][45][46]. For latent heat measurement of the nanofluids, the difference between the amount of heat needed to maintain the sample and the reference at the same temperature was recorded.…”

Section: Measurement Of Latent Heatmentioning

confidence: 99%

Phase change characteristics of ethylene glycol solution-based nanofluids for subzero thermal energy storage

Zhu

Yin

et al. 2016

Int. J. Energy Res.

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Summary Nanofluids, particularly water‐based nanofluids, have been extensively studied as liquid–solid phase change materials (PCMs) for thermal energy storage (TES). In this study, nanofluids with aqueous ethylene glycol (EG) solution as the base fluid are proposed as a novel PCM for cold thermal energy storage. Nanofluids were prepared by dispersing 0.1–0.4 wt% TiO2 nanoparticles into 12, 22, and 34 vol.% EG solutions. The dispersion stability of the nanofluids was evaluated by Turbiscan Lab. The liquid–solid phase change characteristics of the nanofluids were also investigated. Phase change temperature (PCT), nucleation temperature, and half freezing time (HFT) were investigated in freezing experiments. Subcooling degree and HFT reduction were then calculated. Latent heat of solidification was measured using differential scanning calorimetry. Thermal conductivity was determined using the hot disk thermal constant analyzer. Experimental results show that the nanoparticles decreased the PCT of 34 vol.% EG solution but minimally influenced the PCT of 12 and 22 vol.% EG solutions. For all nanofluids, the nanoparticles decreased the subcooling degree, HFT, and latent heat but increased the thermal conductivity of the EG solutions. The mechanism of the improvement of the phase change characteristics and decrease in latent heat by the nanoparticles was discussed. The nanoparticles simultaneously served as nucleating agent that induced crystal nucleation and as impurities that disturbed the growth of water crystals in EG solution‐based nanofluids. Copyright © 2016 John Wiley & Sons, Ltd.

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“…In addition, the application of PCMs into the building envelope is another method, which improves the energy performance of buildings. PCMs can be added in windows [13], walls [14], roofs [15] and floors [16]. Ibrahim et al [17] reviewed a considerable amount of literature relating to the heat transfer enhancement of PCMs for thermal energy storage applications.…”

Section: Introductionmentioning

confidence: 99%

Comparison of two solar-assisted underfloor heating systems with Phase Change Materials

Plytaria

Tzivanidis²,

Alexopoulos

et al. 2019

International Journal of Thermodynamics

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In this work, two underfloor solar assisted heating systems without and with phase change materials (PCMs) are investigated energetically for a building of 100 m 2 floor area, which is situated in Athens, (Greece). The simulations are conducted with the commercial software TRNSYS 17. More analytically, flat plate collectors coupled to a storage tank are used while there is, in the first system, an auxiliary heater and in the second system, a heat pump, for supplying the extra heating demand when the solar potential is not sufficient. The PCM layer (BioPCM Q29/M91) is situated below the underfloor heating system, which operates with water, in order to increase the storage capacity. Moreover, this study compares the indoor temperature profiles of the building with and without a PCM layer on the floor and specifically in different cases by changing the area of the collectors and the thickness of the insulation layer. The results showed that the electrical energy consumption decreases on average 70% and 41% for the system with an auxiliary heater and for the system with heat pump respectively. Moreover, the application of the PCM layer on the floor in both systems gives an increase of the indoor temperature about 2 o C into the limits of thermal comfort.

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DSC test error of phase change material (PCM) and its influence on the simulation of the PCM floor

Cited by 54 publications

References 17 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

Phase change characteristics of ethylene glycol solution-based nanofluids for subzero thermal energy storage

Comparison of two solar-assisted underfloor heating systems with Phase Change Materials

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