Experimental study on the phase change behavior of phase change material confined in pores

Zhang, Dong; Tian, Shuang; Xiao, Deyan

doi:10.1016/j.solener.2006.08.010

Cited by 252 publications

(93 citation statements)

References 23 publications

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“…Fricke et al [18] showed that at 0.1 mbar pressure, thermal conductivity values of EP are comparable to that of micro silica powders. However, pore size of EP is relativity large in micrometric range (approximately 3 µm) [19] and requires a high level of vacuum (0.01 mbar) to limit its gaseous thermal conductivity. Larger pores of EP can be partly filled by aggregates of FS powder (mean aggregate size 0.2-0.3 µm), thus limiting the gaseous conductivity under vacuum conditions.…”

Section: Introductionmentioning

confidence: 99%

Experimental characterisation and evaluation of the thermo-physical properties of expanded perlite—Fumed silica composite for effective vacuum insulation panel (VIP) core

Alam

Singh

Brunner

et al. 2014

Energy and Buildings

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The thermo-physical properties of expanded perlite-fumed silica composites were experimentally investigated as an alternative lower cost material for vacuum insulation panel (VIP) core using expanded perlite as a cheaper substitute of fumed silica. Pore size analysis was carried out using nitrogen sorption technique, Mercury Intrusion Porosimetry and Transmission Electron Microscopy and average pore size was estimated to be in the range of 50 -150 nm. VIP core board samples measuring 100 mm×100 mm and consisting of varying proportions of expanded perlite, fumed silica, silicon carbide and polyester fibre in the composite were prepared. The centre of panel thermal conductivity of the core board containing expanded perlite mass proportion of 60% was measured as 53 mWm -1 K -1 at atmospheric pressure and 28 mWm -1 K -1 when expanded perlite content was reduced to 30%. The centre of panel thermal conductivity with 30% expanded perlite content was measured as 7.6 mWm -1 K -1 at 0.5 mbar pressure. Radiative conductivity of the composite with expanded perlite mass of 30% was measured to be 0.3 -1 mWm -1 K -1 at 300 K and gaseous thermal conductivity 0.016 mWm -1 K -1 at 1 mbar, a reduction of 8.3 mWm -1 K -1 from the value of gaseous thermal conductivity at 1 atm pressure. Opacifying properties of expanded perlite were quantified and are reported. A VIP core cost reduction potential of 20% was calculated through the use of expanded perlite in VIP core.

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Section: Introductionmentioning

confidence: 99%

Experimental characterisation and evaluation of the thermo-physical properties of expanded perlite—Fumed silica composite for effective vacuum insulation panel (VIP) core

Alam

Singh

Brunner

et al. 2014

Energy and Buildings

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“…To reduce the thermal gradient inside the battery pack and solve the conflict between large heat storage capacity and low thermal conductivity (0.25 W/mK for paraffin wax), many approaches towards making composite PCMs have been conducted and they include 1) embedding a metal matrix into PCM; 2) impregnating porous materials [183][184][185][186][187]; 3) adding high thermal conductivity substances in paraffin [188,189]; and 4) developing latent heat thermal energy storage systems with unfinned and finned structures [190][191][192]. The improved thermal conductivity for the composite PCM (PCM/graphite matrix) from references [140,180,181] ranges from 3 W/mK to 16.6 W/mK.…”

Section: Liquidmentioning

confidence: 99%

A critical review of thermal management models and solutions of lithium-ion batteries for the development of pure electric vehicles

Wang

Jiang

et al. 2016

Renewable and Sustainable Energy Reviews

810

246

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Power train electrification is promoted as a potential alternative to reduce carbon intensity of transportation. Lithium-ion batteries are found to be suitable for hybrid electric vehicles (HEVs) and pure electric vehicles (EVs), and temperature control on lithium batteries is vital for long-term performance and durability. Unfortunately, battery thermal management (BTM) has not been paid close attention partly due to poor understanding of battery thermal behaviour. Cell performance change dramatically with temperature, but it improves with temperature if a suitable operating temperature window is sustained. This paper provides a review on two aspects that are battery thermal model development and thermal management strategies. Thermal effects of lithium-ion batteries in terms of thermal runaway and response under cold temperatures will be studied, and heat generation methods are discussed with aim of performing accurate battery thermal analysis. In addition, current BTM strategies utilised by automotive suppliers will be reviewed to identify the imposing challenges and critical gaps between research and practice. Optimising existing BTMs and exploring new technologies to mitigate battery thermal impacts are required, and efforts in prioritising BTM should be made to improve the temperature uniformity across the battery pack, prolong battery lifespan, and enhance the safety of large packs.

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“…A constant heating/cooling rate of 1°C min -1 was applied for all the samples, as recommended by [19,21]. The temperature history was the following: (1) initial isothermal period at -5°C for 5 min; (2) dynamic heating up to 50°C at a rate of 1°C min -1 ; (3) stabilization at 50°C for 5 min; (4) dynamic cooling to -5°C at a rate of -1°C min -1 .…”

Section: Materials and Sample Preparationmentioning

confidence: 99%

Estimation of the specific enthalpy–temperature functions for plastering mortars containing hybrid mixes of phase change materials

Kheradmand

Azenha

2014

Int J Energy Environ Eng

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The use of phase change materials (PCMs) for the building sector is increasingly attracting attention from researchers and practitioners. Several research studies forwarded the possibility of incorporating microencapsulated PCM in plastering mortars for building façades, in pursuit of increased energy efficiency associated with the heat storage capacity of PCM. However, most of these studies are centred in the use of a single type of PCM, which is bound to be more adequate for a given season of the year (e.g. winter or summer) than for all the seasons. The study proposed in this work regards the evaluation of the possibility of using more than one kind of PCM, with distinct melting ranges, here termed as hybrid PCMs, in plastering mortars, to achieve adequately advantageous performance in all seasons of the year. To characterize the PCM, the specific enthalpy and phase change temperature should be adequately measured. The main purpose of this study was to show the conceptual feasibility of combining PCMs in mortars and to evaluate the behaviour of the resulting mortars with differential scanning calorimeter. The results showed that the behaviour of the mortar that contains more than one type of PCM can be predicted through the superposition of effects of the independent PCMs and no interaction occurs between them. The knowledge obtained from the experimental testing established bases for a framework of numerical simulation of real-scale applications, which can be used to ascertain the feasibility of the hybrid PCM concept for decreases in energy consumption of heating/cooling demands in the buildings.

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Experimental study on the phase change behavior of phase change material confined in pores

Cited by 252 publications

References 23 publications

Experimental characterisation and evaluation of the thermo-physical properties of expanded perlite—Fumed silica composite for effective vacuum insulation panel (VIP) core

Experimental characterisation and evaluation of the thermo-physical properties of expanded perlite—Fumed silica composite for effective vacuum insulation panel (VIP) core

A critical review of thermal management models and solutions of lithium-ion batteries for the development of pure electric vehicles

Estimation of the specific enthalpy–temperature functions for plastering mortars containing hybrid mixes of phase change materials

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