Study on preparation and thermal properties of binary fatty acid/diatomite shape-stabilized phase change materials

Li, Min; Wu, Zhishen; Kao, Hongtao

doi:10.1016/j.solmat.2011.04.017

Cited by 145 publications

(50 citation statements)

References 23 publications

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“…Equation (1) was developed by Li et al (2011) and links the component mass ratios to the melting temperature. Binary eutectic mixtures (Yanping et al 2011) were calculated first through Eq.…”

Section: Mass Ratio Of Ca-ma-pa Ternary Eutectic Mixturesmentioning

confidence: 99%

“…Paraffin materials have been widely used owing due to desirable thermal characteristics, such as minimal supercooling, varied phase change temperature, low vapor pressure in the melt, good thermal, chemical stability and self-nucleating behavior (Sharma et al 2009;Baetens et al 2010;Regin et al 2008;Kenisarin 2010). Among the organic PCMs evaluated fatty acids are promising and then paraffin-based materials fatty acid have suitable phase change temperature, high latent heat capacity and easy manufacturing from common vegetable and animal oils (Oró et al 2012;Yuan et al 2014a, b;Karaipekli and Sari 2008;Sari and Kaygusuz 2002;Li et al 2011;Yanping et al 2011;Karaipekli and Sarı 2010).…”

Section: Introductionmentioning

confidence: 99%

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Effects of various types of graphite on the thermal conductivity and energy storage properties of ternary eutectic fatty acid-based composite as phase change material

Jebasingh¹

2016

Renewables

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Energy is the greatest challenge facing the environment. Energy efficiency can be improved by energy storage by management of distribution networks, thereby reducing cost and improving energy usage efficiency. This research investigated the energy efficiency achieved by adding various types of graphite (e.g., flake and amorphous) to organic-based ternary eutectic mixtures like capric acid (CA)-myristic acid (MA)-palmitic acid (PA)-based composite phase change materials (PCMs) under the assistance of ultrasonication to improve thermal properties for thermal energy storage. The graphite was surface modified under a Fresnel lens by using concentration of solar rays, then exfoliation of flake graphite by solar irradiation (xG-F) and exfoliation of amorphous graphite by microwave irradiation (xG-A). For each type of graphite exfoliation, ternary eutectic mixtures with mass concentrations of 5 wt% were prepared. The structure, thermal energy storage properties, and thermal stability of the composite PCM were investigated. Thermal conductivity of the samples in the liquid phase was measured using the transient line source method (KD2Pro). The thermal conductivity was increased by loading xG while energy storage properties were slightly decreased. Furthermore, CA-MA-PA + 5 % xG-F has a slightly modified phase change temperature and enthalpy of melting (T m = 17.5 °C; ΔH m = 143.7 J/g) and freezing (T f = 6.7 °C; ΔH f = 125.5 J/g); this PCM showed higher thermal conductivity of 0.170 W/(m K), representing an increase of up to 114 % relative to the parent material. On the basis of the above results, xG-A was cheaper than xG-F, but they decrease the energy storage capacity according to DSC results obtained at 2 °C/min. CA-MA-PA/xG-F has more potential for use in low temperature energy storage applications.

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Section: Mass Ratio Of Ca-ma-pa Ternary Eutectic Mixturesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of various types of graphite on the thermal conductivity and energy storage properties of ternary eutectic fatty acid-based composite as phase change material

Jebasingh¹

2016

Renewables

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“…The introduction of 2 wt.% of EG into the composite increased the thermal conductivity of the form-stable CA-MA/VMT composite PCM by about 85%. Li et al [115] prepared CA-PA binary blends impregnated into attapulgite. The pore structure of the CA-PA/attapulgite composite PCM was found to be an open-ended tubular capillary type, which was beneficial for the adsorption processes.…”

Section: Other Sspcmsmentioning

confidence: 99%

“…The binary fatty acids were absorbed into four types of diatomites having different specific areas, which then acted as the supporting material. The results showed that there is an optimum absorption ratio between the binary fatty acids and the diatomite [115]. Karaman et al [116] incorporated PEG into the pores of diatomite and characterized the resulting PEG/diatomite composite as a novel form-stable composite PCM.…”

Section: Other Sspcmsmentioning

confidence: 99%

Different Phase Change Material Implementations for Thermal Energy Storage

Karkri

Lefèbvre

Royon

2015

The Handbook of Environmental Chemistry

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This paper presents the principal methods available for phase change material (PCM) implementation in different storage applications. The first part is devoted to a non-exhaustive overview of the various chemical processes used to develop stable PCM (such as microencapsulation, emulsion polymerization or suspension polycondensation, polyaddition, etc.) based on the available literature. The second part deals with shape-stabilized PCM, developed from an intimate combination of a polymer matrix and a phase change element. Materials able to include more thermal energy as usual ones are interesting as they increase the thermal inertia of the system that presents by this way advantages. The energy efficiency of buildings may be improved including PCMs that store and provide enthalpy from one hand and without any significant temperature modification during the phase change process on the other hand. If the solid phase of the PCM does not present any problem, it is not the same for the liquid phase which must be maintained mechanically at its assigned location. Furthermore, the PCM in the solid (and furthermore in the liquid phase) does not have mechanical properties which allow to use it as a structural material able to support charge loads. This paper presents different methods to distribute and maintain the PCM in the thermal solid matrix.

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“…Bu sorunları önlemek amacıyla günümüzde mikrokapsülleme, nanokapsülleme ve kompozit hazırlama çalışmaları yapılmaktadır. Literatürdeki [4][5][6][7] FDM kompozitleri incelendiğinde FDM'lerin kompozit oluşturmaya yatkın maddeler oldukları anlaşılmaktadır.…”

Section: Introductionunclassified

Termal Enerji̇ Depolama Materyali̇ Olarak Di̇yatomi̇t/Faz Deği̇şti̇ren Madde Kompozi̇tleri̇ni̇n Üreti̇lmesi̇

Konuklu¹,

Ersoy²,

Paksoy³

et al. 2017

Ömer Halisdemir Üniversitesi Mühendislik Bilimleri Dergisi

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ÖZTeknolojik yeniliklerin oluşması ve yaşamsal standartların artması ile birlikte enerji ihtiyacı gün geçtikçe artmakta ve enerji tasarrufu birçok sektörde ön plana çıkmaktadır. Enerji üretimi kadar, üzerinde düşünülmesi gereken asıl önemli konu enerji tasarrufunun sağlanabilmesidir. Sınırlı enerji kaynaklarına sahip olan ülkemizde bu bilincin oluşturulabilmesi oldukça önemli bir konudur. Son yıllarda, birçok sektörde enerji tasarrufunun sağlanabilmesi amacıyla, yenilenebilir enerji kaynaklarından yararlanma ve bu amaçla faz değiştiren maddelerde (FDM) termal enerji depolaması araştırmaları ivme kazanmıştır. Termal enerji depolama uygulamalarında FDM'lerin yüksek hacimsel depolama ve izotermal davranışları tercih edilmelerindeki en önemli nedenlerdir. Diyatomit ülkemizde önemli yatakları bulunan doğal bir hammaddedir. Türkiye'nin diyatomit rezervi 44,2 milyon ton civarındadır. Kaliteli rezervlere sahip olmamıza rağmen bu doğal kaynakları değerlendirmemiz çok yetersizdir. Bu doğal minerallerin doğru yerlerde kullanımı ve değerlendirilmesi ile yeni kullanım alanları oluşturularak ülke ekonomisine büyük katkılar sağlanabilir. Son zamanlarda özellikle diyatomitin sahip olduğu nanotüplü yapı kompozit hazırlamada önem kazanmaktadır. Bu çalışma kapsamında termal enerji depolama çalışmalarında kullanılan FDM ile diyatomit/FDM kompozitleri üretilmiştir. Hazırlanan kompozitler Diferansiyel taramalı kalorimetre (DSC) ve taramalı elektron mikroskobu (SEM) ile analiz edilmiştir. DSC analizleri sonucunda sentezlenen kompozitlerin erime ve donma noktasının 41,97°C ve 45,77°C, gizli ısı depolama kapasitesinin +45 ve -44 J/g olduğu belirlenmiştir. Yapılan analizler FDM/Diyatomit kompozit üretiminin başarı ile gerçekleştiği ve termal enerji depolama uygulamalarında kullanılabileceğini doğrulamaktadır.Anahtar Kelimeler: Faz değiştiren maddeler, diyatomit, termal enerji depolama, kompozit PRODUCTION OF DIATOMITE/PHASE CHANGING MATERIAL COMPOSITES AS THERMAL ENERGY STORAGE MATERIAL ABSTRACTEnergy requirement increases day by day associated with technological changes and increasing life standards and energy conservation comes into prominence in many sectors. Energy conservation is much more important subject and needs to be addressed as just as energy consumption. To be aware of this subject is an important subject in our country which has limited energy sources. In recent years, research on renewable energy sources

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Study on preparation and thermal properties of binary fatty acid/diatomite shape-stabilized phase change materials

Cited by 145 publications

References 23 publications

Effects of various types of graphite on the thermal conductivity and energy storage properties of ternary eutectic fatty acid-based composite as phase change material

Effects of various types of graphite on the thermal conductivity and energy storage properties of ternary eutectic fatty acid-based composite as phase change material

Different Phase Change Material Implementations for Thermal Energy Storage

Termal Enerji̇ Depolama Materyali̇ Olarak Di̇yatomi̇t/Faz Deği̇şti̇ren Madde Kompozi̇tleri̇ni̇n Üreti̇lmesi̇

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