Numerical and experimental investigation of a PCM-based thermal storage unit for solar air systems

Charvát, Pavel; Klimeš, Lubomír; Ostrý, Milan

doi:10.1016/j.enbuild.2013.10.011

Cited by 114 publications

(32 citation statements)

References 34 publications

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“…As mentioned by Charvat et al, several sources disagree on the value of the heat capacity of RT42 at either side of the main transition [48]. Our earlier ASC work gave 3.5 J g À1 K À1 for the low-temperature phase and 2.3 J g À1 K À1 for the liquid phase [47]; these values are confirmed by the present results.…”

Section: Solid Heat Capacitysupporting

confidence: 81%

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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Section: Solid Heat Capacitysupporting

confidence: 81%

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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“…Organic phase change materials (PCMs) have the ability to remove and store heat passively, thereby making them excellent candidates for the thermal management of portable electronic devices [1] and electric vehicle batteries [2], as well as for storing and reusing thermal energy in residential solar-thermal and HVAC systems [3][4][5]. The amount of heat that can be stored within a PCM is governed by its phase change enthalpy, which is typically high for commercial paraffin waxes (on the order of 200 kJ/kg [6,7]).…”

Section: Introductionmentioning

confidence: 99%

Effect of carbon nanotube interfacial geometry on thermal transport in solid–liquid phase change materials

Warzoha

Fleischer

2015

Applied Energy

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h i g h l i g h t sNanoparticle constriction effect on the thermal conductivity of a PCM is quantified. Interfacial thermal resistance is found as a function of the constriction geometry. Contact area between nanoparticles has a significant impact on thermal transport. a b s t r a c tFor nearly two decades, research groups have attempted to increase the thermal conductivity of bulk materials by saturating them with different concentrations and types of nanoparticles. However, optimal enhancements in the thermal conductivity of these materials continue to go unrealized, primarily due to interfacial phenomena that impede phonon propagation from the bulk material to the nanoparticle or between individual, contacting nanoparticles. Though it is almost certain that interfacial resistances between contacting nanoparticles are responsible for the underwhelming thermal performance of nanoparticles in bulk materials, the physical mechanisms that limit thermal transport at nanoparticle junctions is not well understood. In this study, we investigate the effect of nanoparticle constriction size (i.e. the contact area between linked nanoparticles) on the bulk thermal conductivity of a surrounding paraffin-based phase change material. To this end, we measure the effective thermal conductivity of different Multi-walled Carbon Nanotube (MWCNT)/paraffin nanocomposites is measured with the transient plane source technique. Using a newly developed physical model, the interfacial thermal resistance between the contacting nanoparticles is determined as a function of the constriction geometry. Results suggest that the thermal conductance (i.e. the rate of heat transfer) between contacting MWCNTs can be increased by a factor of 27 by increasing their diameter by only 58 nm. This is in direct conflict with effective medium approximations, which predict an increase in the bulk thermal conductivity of MWCNT-PCM composites when MWCNT diameters are reduced. Such a result indicates that the contact area between individual, contacting nanoparticles has a significant impact on thermal transport within the PCM nanocomposite, and therefore its bulk thermal conductivity. It is expected that these results will strongly impact the design of nanoparticle-laden PCMs.

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“…On the other hand, active systems need additional energy and they can be integrated into HVAC or operate as stand alone units. The most common forms of PCM's encapsulation are plates [8,9,10], capsules [11,12], shell and tube [13,14,15].…”

Section: Introductionmentioning

confidence: 99%

PCM thermal storage system for ‘free’ heating and cooling of buildings

Osterman

Butala

Stritih

2015

Energy and Buildings

165

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Numerical and experimental investigation of a PCM-based thermal storage unit for solar air systems

Cited by 114 publications

References 34 publications

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

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

Effect of carbon nanotube interfacial geometry on thermal transport in solid–liquid phase change materials

PCM thermal storage system for ‘free’ heating and cooling of buildings

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