Recent advances on thermal conductivity enhancement of phase change materials for energy storage system: A review

Qureshi, Zubair Ahmad; Ali, Hafız Muhammad; Khushnood, Shahab

doi:10.1016/j.ijheatmasstransfer.2018.08.049

Cited by 524 publications

(124 citation statements)

References 98 publications

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“…Prior to the usage of a renewable energy, the optimal use and conservation should be learnt to overcome its common intermittency. 5,6 Developing novel material and methods to resolve this issue has attracted many researchers. Its primary purpose is to avoid thermal energy dissipation and shift the power release into the time where it is required.…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of nano‐enhanced myristic acid using metal oxide nanoparticles for thermal energy storage

et al. 2019

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Summary Fatty acids have been broadly used as phase change materials (PCMs) for thermal energy storage. However, low thermal conductivity limits their performances. This paper investigates the influence of metal oxide nanoparticle addition on myristic acid (MA) as nano‐enhanced PCM (NEPCM). Stability, chemical, and thermal properties were considered. Four types of nanoaprticles, TiO2, CuO, Al2O3, and ZnO, were dispersed in MA at 0.1, 0.5, 1, and 2 wt%. Stability and dispersion were checked by sediment photograph capturing and scanning electron microscopy/energy‐dispersive spectroscopy. The Fourier‐transformed infrared (FTIR) and X‐ray diffraction analysis confirmed no chemical interaction between the nanoparticles and MA. The results revealed a ratio of thermal conductivity of 1.50, 1.49, 1.45, and 1.37, respectively, for 2 wt% of ZnO, Al2O3, CuO, and TiO2. The T‐history method confirmed this enhancement. The latent heat thermal energy storage (LHTES) properties of the nano‐enhanced MA were evaluated using differential scanning calorimetry. The latent heat capacities of nano‐enhanced MA samples have dropped between 9.64 and 5.01 % compared with pure MA, and phase change temperature range was not affected significantly. The NEPCM was subjected to 500 thermal cycling, it showed a good thermal reliability as LHTES properties remained unchanged, while FTIR analysis showed similar characteristics compared with uncycled samples, indicating a good chemical stability. Based on the results regarding with the LHTES properties, cycling thermal reliability, and higher thermal conductivity improvement, it can be achieved that the MA/Al2O3 (2.0 wt%) and MA/ZnO (2.0 wt%) composites could be better PCMs for solar TES applications.

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Section: Introductionmentioning

confidence: 99%

Preparation and characterization of nano‐enhanced myristic acid using metal oxide nanoparticles for thermal energy storage

et al. 2019

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“…This response time is consistent with the estimated characteristic thermal time constant of the time‐limiting thermal diffusion processes in the device, i.e., cross‐plane thermal diffusion in the PCM‐Ecoflex composite layer and the lateral thermal diffusion within the elastomer layers (Note S2, Supporting Information). The thermal diffusion time can also be greatly reduced by enhancing the thermal conductivity of the PCM and the elastomer, which has been explored extensively …”

Section: Resultsmentioning

confidence: 99%

An Adaptive and Wearable Thermal Camouflage Device

Hong

Shin

Chen

2020

Adv Funct Materials

124

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Thermal cloaking and camouflage have attracted increasing attention with the progress of infrared surveillance technologies. Previous studies have been mainly focused on emissivity manipulation or using sophisticated thermal metamaterials. However, emissivity control is only applicable for objects that are warmer than the environment and lower emissivity is usually accompanied with high reflectance of the surrounding thermal signals if they have nonuniform temperature. Metamaterial‐based thermal camouflage holds great promise but their applications on human subjects are yet to be realized. Direct temperature control represents a more desirable strategy to realize dynamically adjustable camouflage within a wide ambient temperature range, but a wearable, portable, and adjustable thermo‐regulation system that is suitable for human subjects has not been developed. This work demonstrates a wearable and adaptive infrared camouflage device responding to the background temperature change based on the thermoelectric cooling and heating effect. The flexible thermoelectric device can realize the infrared camouflage effect to effectively shield the metabolic heat from skin within a wide range of background temperature: 7 °C below and 15 °C above the ambient temperature, showing promise for a broad range of potential applications, such as security, counter‐surveillance, and adaptive heat shielding and thermal control.

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“…Because the melting points of the composite PCMs is approximately 23°C, the thermal conductivity of TiO 2 , PEG/TiO 2 , and Cu/PEG/TiO 2 composite PCMs was examined between 18°C and 20°C. The thermal conductivities of TiO 2 and PEG/TiO 2 composite PCMs decreased at 18°C to 19.5°C and increased at 19.5°C to 20°C, which may be attributed to the molecular vibration in the matrix . Furthermore, the mean thermal conductivities of the prepared Cu/PEG/TiO 2 was calculated to be 0.58 W/(mK), which indicates the increase in the thermal conductivity by 152.2%, which is 38.1% higher than that of 0.8PEG/TiO 2 .…”

Section: Resultsmentioning

confidence: 99%

Enhanced thermal conductivity of copper‐doped polyethylene glycol/urchin‐like porous titanium dioxide phase change materials for thermal energy storage

et al. 2019

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Summary A composite phase change material (PCM) of copper‐doped polyethylene glycol (PEG) 2000 impregnated urchin‐like porous titanium dioxide (TiO2) microspheres (PEG/TiO2) was successfully synthesised. The urchin‐like porous TiO2 structures contain hollow cavities that can provide a high PEG loading capacity of up to 80 wt%. Copper nanoparticles were uniformly dispersed on the outer and inner surfaces of the 0.8PEG/TiO2 as additives to enhance the thermal conductivity of the composite PCM. The latent heat of the Cu/PEG/TiO2 porous composite PCM reached 133.8 J/g, and the thermal conductivity was 0.58 W/(mK), which was 152.2% higher than that of TiO2 and 38.1% higher than 0.8PEG/TiO2. Moreover, the Cu/PEG/TiO2 porous composite PCM has excellent thermal stability and reliability.

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Recent advances on thermal conductivity enhancement of phase change materials for energy storage system: A review

Cited by 524 publications

References 98 publications

Preparation and characterization of nano‐enhanced myristic acid using metal oxide nanoparticles for thermal energy storage

Preparation and characterization of nano‐enhanced myristic acid using metal oxide nanoparticles for thermal energy storage

An Adaptive and Wearable Thermal Camouflage Device

Enhanced thermal conductivity of copper‐doped polyethylene glycol/urchin‐like porous titanium dioxide phase change materials for thermal energy storage

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