Organic phase change materials and their textile applications: An overview

Sarıer, Nihal; Önder, Emel

doi:10.1016/j.tca.2012.04.013

Cited by 585 publications

(272 citation statements)

References 279 publications

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“…Initially, a multifunctional monomer is dissolved in the organic core material and then the resulting mixture is dispersed in an aqueous phase containing a mixture of emulsifiers and protective colloid stabilizers. Combination of monomers is then added to the aqueous phase for the formation of a polymer shell [33]. Fig.…”

Section: Interfacial Polycondensationmentioning

confidence: 99%

Review of solid–liquid phase change materials and their encapsulation technologies

Darkwa

Kokogiannakis

2015

Renewable and Sustainable Energy Reviews

771

267

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Various types of solid-liquid phase change materials (PCMs) have been reviewed for thermal energy storage applications. The review has shown that organic solid-liquid PCMs have much more advantages and capabilities than inorganic PCMs but do possess low thermal conductivity and density as well as being flammable. Inorganic PCMs possess higher heat storage capacities and conductivities, cheaper and readily available as well as being non-flammable, but do experience supercooling and phase segregation problems during phase change process. The review has also shown that eutectic PCMs have unique advantage since their melting points can be adjusted. In addition, they have relatively high thermal conductivity and density but they possess low latent and specific heat capacities. Encapsulation technologies and shell materials have also been examined and limitations established. The morphology of particles was identified as a key influencing factor on the thermal and chemical stability and the mechanical strength of encapsulated PCMs. In general, in-situ polymerization method appears to offer the best technological approach in terms of encapsulation efficiency and structural integrity of core material. There is however the need for the development of enhancement methods and standardization of testing procedures for microencapsulated PCMs. Abstract: Various types of solid-liquid phase change materials (PCMs) have been reviewed for thermal energy storage applications. The review has shown that organic solid-liquid PCMs have much more advantages and capabilities than inorganic PCMs but do possess low thermal conductivity and density as well as being flammable. Inorganic PCMs possess higher heat storage capacities and conductivities, cheaper and readily available as well as being non-flammable, but do experience supercooling and phase segregation problems during phase change process. The review has also shown that eutectic PCMs have unique advantage since their melting points can be adjusted. In addition they have relatively high thermal conductivity and density but they possess low latent and specific heat capacities. Encapsulation technologies and shell materials have also been examined and limitations established. The morphology of particles were identified as a key influencing factor on the thermal and chemical stability and the mechanical strength of encapsulated PCMs. In general, in-situ polymerization method appears to offer the best technological approach in terms of encapsulation efficiency and structural integrity of core material. There is however the need for the development of enhancement methods and standardization of testing procedures for microencapsulated PCMs.

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Section: Interfacial Polycondensationmentioning

confidence: 99%

Review of solid–liquid phase change materials and their encapsulation technologies

Darkwa

Kokogiannakis

2015

Renewable and Sustainable Energy Reviews

771

267

View full text Add to dashboard Cite

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“…Moreover, it has been observed that the distribution of particles becomes narrower as the stirring rate and dropping rate decreases. A narrow size distribution is desired because it is one of the factors that indicate the applicability of MEPCMs since some applications have certain size requirements [16], [17].…”

Section: A Ftir and Sem Analysis Of Mepcmsmentioning

confidence: 99%

Characterization of MEPCM-Incorporated Paint as Latent Heat Storage System

Tumolva¹,

Sabarillo²

2017

IJCEA

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Abstract-This study aimed to determine the effect of the mixing speed and pre-polymer dropping rate during synthesis of microencapsulated phase change materials (MEPCMs), and to assess the performance of MEPCM-incorporated paint as a latent heat storage (LHS) system. N-octadecane as phase change material was encapsulated with resorcinol-modified ureamelamine-formaldehyde at two different mixing speeds and four different pre-polymer dropping rates, and Fourier transform infrared (FTIR) spectroscopy was done to confirm success of microencapsulation. Scanning electron microscopy (SEM) revealed that increasing the homogenization speed and decreasing the pre-polymer dropping rate decreases the microcapsule size. Differential scanning calorimetry results showed that latent heat and encapsulation ratio increases with increasing mixing speed and decreasing pre-polymer dropping rate. The synthesized MEPCMs were incorporated into white paint at three different concentrations, and temperature profiling revealed that the paint's temperature buffering capacity generally increases with increasing mixing speed, decreasing pre-polymer dropping rate and increasing MEPCM concentration.Index Terms-Heat storage, MEPCM, phase change material, microencapsulation.

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“…As a thermal buffer, PCMs are also incorporated in textile fabrics. PCM can be applied to textile material as layers or inside microcapsules to provide thermal regulation [8]. Mondal (2008) [9] states that the microencapsulated PCM technology in the textile structure was firstly used by NASA researchers in the early 1980s to provide an improved thermal protection in the fabrics of astronauts against sudden temperature changes in outer space.…”

Section: Introductionmentioning

confidence: 99%

İtfaiyeci Kıyafeti İçerisindeki Isıl Düzenlemenin Sayısal İncelenmesi

Alptekin¹,

Ezan²,

Gül³

et al. 2017

Tekstil ve Mühendis

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Phase change materials (PCMs) are widely used in heating and cooling applications to reduce the mismatch between the energy production and the demand. PCMs can also be incorporated into the thermal systems to maintain a constant temperature and conduce to increase the thermal comfort. Unlike any human-made thermal system, the thermal comfort of the human body is more crucial since a possible damage may not be recovered. In this study, PCM layers are incorporated into the textile fabric to increase the thermal comfort of a firefighter and protect the skin layers from the thermal burn due to overheating. A transient one-dimensional numerical model is developed in the ANSYS-FLUENT software. The effect of blood perfusion inside skin layers is simulated as an energy source term and defined into the software using user-defined-function (UDF). The validatity of the source term implentation into ANSYS-FLUENT is proven by repoducing a reduced model fom the literature. The predicted time-wise variations of the temperature of the body layers are compared with the ones which are taken from the literature. After the validation procedure, the usage of PCM inside a firefighter protective clothing is numerically investigated by varying the thermal boundary conditions acting on the coating. Results depict that, for the longest fire exposure duration the 1 st -degree burn is effective for a depth of 5.29 mm and the 3 rd -degree burn is observed for a depth of 2.57 mm. Implementing the PCM inside the clothing inhibits the temperature rise in skin layers and improves the heat storage capacity of the fabric. In the current design and working conditions, firefighter protective clothing with 1 mm of PCM layer prevents the skin burn, even for the longest fire exposure scenario. Keywords:Textile, phase change materials, numerical model, thermal protection, thermal burn İTFAİYECİ KIYAFETİ İÇERİSİNDEKİ ISIL DÜZENLEMENİN SAYISAL İNCELENMESİ ÖZET: Faz değişim malzemeleri (FDM) enerji üretimi ve talebi arasındaki uyumsuzluğu azaltmak amacıyla ısıtma ve soğutma uygulamalarında yaygın olarak kullanılmaktadır. FDM'ler ayrıca ısıl sistemler içerisine uygulanarak sabit sıcaklık sağlar ve ısıl konforun artmasına vesile olurlar. İnsanoğlu tarafından üretilen tüm sistemlerden farklı olarak olası bir hasarın geri dönüşünün mümkün olmaması nedeniyle, insan vücudunun ısıl konfor koşulları çok daha önemlidir. Bu çalışmada itfaiyecinin ısıl konfor koşullarının arttırılması ve aşırı ısınma kaynaklı deri hasarlarının engellenmesi amacıyla tekstil kumaşı tabakaları içerisine faz değişim malzemesi yerleştirilmiştir. ANSYS-FLUENT paket programında zamana bağlı 1-boyutlu bir sayısal model geliştirilmiştir. Deri katmanları içerisindeki kan dolaşımından kaynaklı ısı transferi etkisini programda tanımlamak için kullanıcı-tanımlı-fonksiyon (UDF) oluşturulmuş ve programa aktarılmıştır. ANSYS-FLUENT paket programı içerisine tanımlanan kaynak terimlerinin uygunluğunu test etmek için öncelikle literatürden alınan basitleştirilmiş bir problem tekrarlanmıştır....

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Organic phase change materials and their textile applications: An overview

Cited by 585 publications

References 279 publications

Review of solid–liquid phase change materials and their encapsulation technologies

Review of solid–liquid phase change materials and their encapsulation technologies

Characterization of MEPCM-Incorporated Paint as Latent Heat Storage System

İtfaiyeci Kıyafeti İçerisindeki Isıl Düzenlemenin Sayısal İncelenmesi

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