Figure-of-merit for phase-change materials used in thermal management

Shao, Li; Raghavan, Arun; Kim, Gun Ho; Emurian, Laurel; Rosen, Jeffrey M.; Papaefthymiou, Marios C.; Wenisch, Thomas F.; Martin, Milo M. K.; Pipe, Kevin P.

doi:10.1016/j.ijheatmasstransfer.2016.05.040

Cited by 70 publications

(14 citation statements)

References 30 publications

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“…[1][2][3] Phase change materials (PCMs) are energy storage materials which can absorb or release a huge amount of heat during the phase change process. 4,5 Because of their merits, which consist of high energy storage density and environmentfriendly features, PCMs have aroused much attention for their applications in many elds such as the construction industry and transportation. 6,7 PCMs can be divided into three categories according to the chemical composition of the inorganic, organic and eutectic phase change materials.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and characterization of novel shape-stabilized stearic acid composite phase change materials with tannic-acid-templated mesoporous silica nanoparticles for thermal energy storage

et al. 2017

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Tannic-acid-templated mesoporous silica nanoparticles (TAMSNs), which were synthesized using a simple, environmentally friendly, cost-effective, and nonsurfactant-based template method, were developed as a matrix for stearic acid to fabricate a novel shape-stabilized phase change material (SA/TAMSN). The characterization results showed that stearic acid was fully adsorbed on the TAMSNs by physical adsorption and the TAMSNs had no effect on the crystal structure of stearic acid. According to the DSC results, although the TAMSNs had a confinement effect on the activity of the stearic acid molecules, the fusion and solidification enthalpies of SA/TAMSN could reach 108.8 J g À1 and 114.1 J g À1, respectively.Additionally, the TGA thermograms indicated that there was no apparent weight loss from 20 C to 223 C for SA/TAMSN, which demonstrated that SA/TAMSNs have excellent thermal stability. All of the results suggested that the TAMSNs could be used as a promising matrix candidate for the shape stabilization of stearic acid.

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Section: Introductionmentioning

confidence: 99%

Fabrication and characterization of novel shape-stabilized stearic acid composite phase change materials with tannic-acid-templated mesoporous silica nanoparticles for thermal energy storage

et al. 2017

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“…In some cases, intermediate rhombohedral (R-phase) and orthorhombic B19 phases will form during this process. 7 In addition to the Martensitic phase transformation, NiTi alloys have a number of attractive properties, including excellent corrosion resistance 8 , high strength and ductility 9 , and good formability via traditional thermomechanical processing, machining, and additive manufacturing. 10 Two 1 mm thick commercial NiTi alloy plates with different transformation temperatures were purchased to demonstrate the ability of SMAs to function as SS-PCMs.…”

mentioning

confidence: 99%

“…Togive an accurate representation of the available data, the FOM values inTable S1have been presented as a range calculated with the high and low reported Austenite values of 15.6-28 W/m·K. This is appropriate because the FOM is generally calculated based on the thermal conductivity of the high temperature phase, in this case the Austenite phase 7. The green band on the abstract imagereflects these calculated high and low literature values for the range of NiTi materials.…”

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confidence: 99%

Solid-state thermal energy storage using reversible martensitic transformations

Sharar

Donovan

Warzoha

et al. 2019

Applied Physics Letters

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The identification and use of reversible Martensitic transformations, typically described as shape memory transformations, as a new class of solid-solid phase change material is experimentally demonstrated here for the first time. To prove this claim, time-domain thermoreflectance, frequency-domain thermoreflectance, and differential scanning calorimetry studies were conducted on commercial NiTi alloys to quantify thermal conductivity and latent heat. Additional Joule-heating experiments demonstrate successful temperature leveling during transient heating and cooling in a simulated environment. Compared to standard solid-solid materials and solid-liquid paraffin, these experimental results show that shape memory alloys provide up to a two order of magnitude higher Figure of Merit. Beyond these novel experimental results, a comprehensive review of >75 binary NiTi and NiTi-based ternary and quaternary alloys in the literature shows that shape memory alloys can be tuned in a wide range of transformation temperatures (from -50 to 330°C), latent heats (from 9.1 to 35.1 J/g), and thermal conductivities (from 15.6 to 28 W/m·K). This can be accomplished by changing the Ni and Ti balance, introducing trace elements, and/or by thermomechanical processing.Combining excellent corrosion resistance, formability, high strength and ductility, high thermal performance, and tunability, SMAs represent an exceptional phase change material that circumvents many of the scientific and engineering challenges hindering progress in this field. MAIN TEXTThermal energy storage (TES) using phase change materials (PCMs) offers tremendous benefits in a diverse array of technology spaces, ranging from large scale power generation to more

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“…[4][5][6][7][8] They also have been found to be effective for thermal applications on a shorter time scale such as high flux thermal transient mitigations. [9][10][11][12] This is a result of lower degrees of subcooling, higher thermal conductivities and high volumetric storage capacities exhibited by metallic PCMs. 13,14 Shobo et al 14 also reported that a metallic PCM (In-48Sn) showed very good thermal cycling stability, over repeated charging/discharging cycles, compared to its organic counterparts.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on the discharge characteristics of two eutectic solder packed bed latent heat storage systems

Mawire

Ekwomadu

Lefenya

et al. 2020

Intl J of Energy Research

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Metallic solder based PCMs possess higher thermal conductivities, larger storage masses and exhibit lower subcooling effects compared to their organic or inorganic counterparts. It is thus justified to investigate their potential usage for medium temperature applications. These solders are relatively expensive and can be combined with cheaper PCMs in cascaded storage systems which are more thermodynamically efficient compared to single PCM systems as reported recently. The aim of the research is thus to compare two packed bed storage systems during discharging cycles using eutectic solder (Sn63/Pb37), that is widely available worldwide. The single PCM system (40 capsules) consists of encapsulated spheres of eutectic solder, whereas the second cascaded system consists of encapsulated spheres of eutectic solder and erythritol in an equal storage ratio in the tank. For the cascaded system, the eutectic solder capsules are placed at the top and erythritol at the bottom of the storage tank (20 capsules at the top and 20 at the bottom). The effect of the discharging flow-rates of 4 mL/s, 6 mL/s and 8 mL/s is investigated in relation to the temperature profiles, energy rates and exergy rates. Increasing the flow-rate, increases heat transfer rate thus shortening the discharging time as well as increasing thermal profile reversals during discharging. The peak energy and exergy rates increase with the increase in the flow-rate for the two storage systems. The single PCM system shows slightly higher average energy and exergy rates compared to the cascaded system possibly due to its higher thermal conductivity. The cascaded PCM system shows higher average stratification numbers at all the flow rates considered. The non-cascaded system exhibited slightly higher exergy recovery efficiencies compared to the cascaded PCM system possibly due to its higher thermal conductivity at all flow-rates considered. The effect of the initial discharging temperature is also investigated with a discharging flow-rate of 6 mL/s after charging with set heater temperatures of 260 C, 280 C and 300 C, respectively. Comparable thermal profiles are seen for both systems for the three set temperatures; however, the single PCM system shows slightly higher storage temperatures. The single PCM shows slightly higher but comparable peak and average discharging energy rates compared to the cascaded system. The exergy rates for the two systems are also comparable.

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Figure-of-merit for phase-change materials used in thermal management

Cited by 70 publications

References 30 publications

Fabrication and characterization of novel shape-stabilized stearic acid composite phase change materials with tannic-acid-templated mesoporous silica nanoparticles for thermal energy storage

Fabrication and characterization of novel shape-stabilized stearic acid composite phase change materials with tannic-acid-templated mesoporous silica nanoparticles for thermal energy storage

Solid-state thermal energy storage using reversible martensitic transformations

Experimental study on the discharge characteristics of two eutectic solder packed bed latent heat storage systems

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