Influence of accuracy of thermal property data of a phase change material on the result of a numerical model of a packed bed latent heat storage with spheres

Arkar, Ciril; Medved, Sašo

doi:10.1016/j.tca.2005.08.032

Cited by 162 publications

(76 citation statements)

References 20 publications

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“…The advantage of this methodology is that the equation is applicable to every phase; the temperature is determined at each point and the value of the thermo-physical properties can then be evaluated. In thermal simulations of PCM, the accuracy of the results relies on the material properties' data (Arkar & Medved, 2005). In the geometry studied in this work, the main properties were enthalpy and thermal conductivity, but notice that the rate of melting/solidification can also depend on other material properties such as viscosity or density (Hamdan & Elwerr, 1996).…”

Section: Modelling the Solid-liquid Phase Changementioning

confidence: 99%

See 1 more Smart Citation

PCM-Air Heat Exchangers: Slab Geometry

Dolado¹,

Lázaro²,

Marı́n³

et al. 2012

Heat Exchangers - Basics Design Applications

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Section: Modelling the Solid-liquid Phase Changementioning

confidence: 99%

“…There are several problems with using DSC for non pure and low thermal conductivity substances (Arkar & Medved, 2005).…”

mentioning

confidence: 99%

PCM-Air Heat Exchangers: Slab Geometry

Dolado¹,

Lázaro²,

Marı́n³

et al. 2012

Heat Exchangers - Basics Design Applications

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“…For the particular case of PCMs, where the interest lies with large transitions, the higher rates of DSCs, combined with the measurement principle, cause problems because the results do not correctly represent the h(T) behaviour that a PCM will exhibit in typical applications. As an example, we point to a study where DSC data at different rates were inserted in a model for an application and compared with actual measurements, it was found that the data from the slowest runs (0.1 K min À1 ) gave the best correspondence [54]. The authors also note that better data are necessary, which can be provided by ASC, not by using lower rates as in DSC, but by a measurement principle that is closer to the actual application conditions.…”

Section: Asc Versus Dscmentioning

confidence: 99%

A new calorimetric technique for phase change materials and its application to alkane-based PCMs

Duponchel

Longuemart

Glorieux

et al. 2016

Mater Renew Sustain Energy

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The correct determination of the phase transition behaviour of phase change materials (PCMs) is paramount for assessing their application potential. In this work, the merits of a novel calorimetric technique, Peltierelement-based adiabatic scanning calorimetry (pASC), for PCM characterisation are investigated, especially in comparison with the commonly-used differential scanning calorimeter (DSC). A comparative study of two alkanebased PCMs, the commercial mixture RT42 and the pure alkane tricosane (C23) with these two techniques shows that pASC provides data at much higher resolution than DSC, due to its operation in thermodynamic equilibrium. Specifically the rate-dependence and deformation that is inherent to DSC experiments is absent in pASC. In addition, the enthalpy of the PCM is directly obtained. pASC results easily conform to the accuracy limits that are proposed in literature for the transition temperature and storage capacity of PCMs.

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“…8 Frequently, the enthalpy function or the apparent heat capacity of a PCM is determined on the basis of DSC measurements made at too high heating/cooling rates. 9 It was found that the standards used in calorimetry designed for the materials other than PCMs are not suitable for PCM testing due to the high heating rate, affecting the melting/solidification range and stored heat. When DSC runs at a higher scanning rate, it will give design information that may not be sufficiently accurate.…”

Section: Introductionmentioning

confidence: 99%

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

show abstract

Influence of accuracy of thermal property data of a phase change material on the result of a numerical model of a packed bed latent heat storage with spheres

Cited by 162 publications

References 20 publications

PCM-Air Heat Exchangers: Slab Geometry

PCM-Air Heat Exchangers: Slab Geometry

A new calorimetric technique for phase change materials and its application to alkane-based PCMs

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

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