1,721,049 research outputs found
Underground thermal heat storage and ground source heat pump activities in Turkey
No full textThis study presents an overview of Underground Heat Storage and Ground Source Heat Pumps situation and activities of Turkey. Shallow geothermal installations started in the early 2000s with Ground Source Heat Pump (GSHP) systems for small houses. In the last five years, shallow geothermal energy applications have been increasing with large shopping malls, governmental building and schools. The national expert group on shallow geothermal energy has been established as part of International Energy Agency Energy Conversation Through Energy Storage (IEA ECES) Annex27 “Quality Management in Design, Construction and Operation of Borehole Systems”. The purpose of this group is to increase awareness, to prepare guidelines, carry out training programs and determine market barriers and suggest actions needed to speed up the success of shallow geothermal applications in Turkey. This paper will give an overview of the current status of UTES and GSHP systems in Turkey and activities of national Annex27 experts group. © 2018 Elsevier Lt
Unconventional experimental technologies used for phase change materials (PCM) characterization: Part 2 - Morphological and structural characterization, physico-chemical stability and mechanical properties
No full textDue to the high interest of appropriate characterization of PCM and hybrid PCM composites, different research centres and universities are using several material characterization techniques not commonly used with PCM, to study the structure and morphology of these materials. Likewise, physico-chemical stability is a crucial parameter for the performance of latent storage materials during time and its evaluation has been done by using molecular spectroscopy, chemiluminiscence or calorimetric tests. Atomic force microscopy and nanoindentation are also reported to characterize hybrid PCM composites. Other chemical aspects studied are related with the compatibility of the PCM and its container and also considered in this compilation of characterization work. ©2014 Elsevier Ltd. All rights reserved.Departament d'Universitats, Recerca i Societat de la Informació ENE2011-28269-C03-01, ENE2011-22722, ENE2011-28269-C03-02 European Commission COST TU0802The work is partially funded by the European Union (COST Action COST TU0802 ) and the Spanish government ( ENE2011-28269-C03-01 , ENE2011-28269-C03-02 and ENE2011-22722 ). The authors would like to thank the Catalan Government for the quality accreditation given to their research group GREA ( 2014 SGR 123 ) and their research group DIOPMA ( 2014 SGR 1543 ). Aran Solé would like to thank the Departament d’Universitats, Recerca i Societat de la Informació de la Generalitat de Catalunya for her research fellowship
Unconventional experimental technologies available for phase change materials (PCM) characterization. Part 1. Thermophysical properties
No full textThe use of thermal energy storage by phase change materials (PCM) is increasing in interest for building applications. For the deployment of the technology, appropriate characterization of PCM and hybrid PCM is essential, but it is not always possible to carry it out with conventional equipment, mainly due to the sample size. This paper shows equipment developed in different research centers and universities to analyze thermophysical properties, such as specific heat, latent heat and melting temperature, and thermal conductivity and diffusivity of PCM and hybrid PCM materials. © 2014 Elsevier Ltd.ENE2011-28269-C03-01, ENE2011-22722, ENE2011-28269-C03-02 European Commission 110M032 Qatar Foundation: BES-2012–051861 COST TU0802The work is partially funded by the European Union (COST Action COST TU0802 ), the Spanish government ( ENE2011-28269-C03-01 , ENE2011-28269-C03-02 and ENE2011-22722 ), TUBITAK (project 110M032 ), and by Qatar National Foundation through the NPRP No.: 4–465-2–173 . The authors would like to thank the Catalan Government for the quality accreditation given to the research group GREA ( 2014 SGR 123 ) and their research group DIOPMA (2014 SGR 1543), both in Spain. Laia Miró would like to thank the Spanish Government for her research fellowship ( BES-2012–051861 )
Synthesis of highly thermal conductive polyethylene terephthalate polymer to use as packging material of phase changematerials.
No full textTEZ10282Tez (Doktora) -- Çukurova Üniversitesi, Adana, 2016.Kaynakça (s. 49-51) var.xi, 53 s. : res. (bzs. rnk.), tablo ; 29 cm.Bu çalışmada Faz Değiştiren Maddelerin (FDM) paketlenmesinde de kullanılabilecek, ısıl değişimlere hızlı cevap verebilmesi için ısıl iletkenliği arttırılmış Polietilen Terefitalat (PET) sentezlenmesi amaçlanmıştır. FDM’ler geniş sıcaklık aralıklarında ısıl enerji depolanması ve tekrar kazanılması amacıyla sıkça kullanılan malzemelerdir. Faz değişiminin kontrollü olarak yapılabilmesi, kolay taşınması ve saklanması için paketleme malzemesi içerisinde muhafaza edilirler. Paketleme malzemesinin korozif ve toksik olmaması, kolay bulunur ve ucuz olması gereklidir. PET, paketleme endüstrisinde sıkça kullanılan bir malzemedir. Mevcut kullanım alanlarına yeni bir alan daha eklenmesi, büyümekte olan PET endüstrisine katkıda bulunacaktır. Ayrıca, FDM’lerin paketlemesinde kullanılabilir malzemelerin çeşitliliğinin arttırılması ile yenilenebilir enerji kaynaklarının kullanım kolaylığı sağlanarak enerji verimliliğinin arttırılması amaçlanmıştır. PET’in ısıl iletkenliğinin arttırılması için kütlece %0,1 - %0,5 ve %1 oranlarında grafen ve polipirol eklenmesi şeklinde iki farklı metot denenmiştir. Son üründe elde edilen katkılı PET’in ticari yapılabilirliği göz önünde bulundurularak katkılar polimerizasyon esnasında, esterleşme reaksiyonu sonunda eklenmiştir. Elde edilen sonuçlar, Grafenli PET karışımlarının polimerizasyon ortamında polimerin istenilen özelliklerine etki etmeden hazırlanabileceğini göstermektedir. Çalışma sonucu elde edilen malzemelerin ısıl iletkenliğinin tespiti için iki farklı metot kullanılmıştır. Kütlece %1 Grafen eklenmesinin polimerin radyal ısıl iletkenliğini 0,28 W/mK ‘den 0,48 W/mK ‘e arttırdığını göstermiştir.The objective of this study is to synthesize Polyethylene Terephthalate (PET) polymer with enhanced thermal conductivity that could be utilized as packaging material in phase change material (PCM) applications for fast thermal response. PCM’s have long been studied and found applications for purposes of thermal energy storage and/or recovery, in a wide temperature range. PCMs needs to be contained in an appropriate packaging material for controlled phase transition, ease of transportation and storage. The packaging material should be non- toxic, noncorrosive, easily available and cheap. PET polymer has long been utilized as packaging material in various industries. This study will improve growing PET industry by adding a new field to existing applications. In addition,, by increasing the variety of materials that can be used in PCM packaging, ease of utilization of renewable energy sources and increasing energy efficiency can be achieved. For this purpose, two methods of increasing thermal conductivity by adding 0,1%, 0,5% and 1 % (w/w) of polypyrrole and graphene to PET were tested. The additives were introduced into polymer synthesis environment, right after the esterification stage. This issue is important for simplicity and applicability advantages for mass production and commercialization. It was shown that this route has no drawback for the aspects of either polymerization process or physical properties of final product. The thermal conductivity of produced composites was tested with two different methods. The results revealed that it is possible to produce PET-Graphene composite easily during polymerization reaction and the thermal conductivity could increase up to 0,48 W/mK with only 1 % Graphene, while PET itself thermal conductivity is 0,28 W/mK.Bu çalışma Ç.Ü. Bilimsel Araştırma Projeleri Birimi tarafından desteklenmiştir. Proje No: FEF2012D21
Thermal energy storage for sustainable energy consumption : fundamentals, case studies and design
No full textWe all share a small planet. Our growing thirst for energy already threatens the future of our earth. Fossil fuels - energy resources of today - are not evenly distributed on the earth. 10 per cent of the world's population exploits 90 per cent of its resources. Today's energy systems rely heavily on fossil fuel resources which are diminishing ever faster. The world must prepare for a future without fossil fuels. Thermal energy storage provides us with a flexible heating and/or cooling tool to combat climate change through conserving energy and increasing energy while utilizing natural renewa
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
2.30 Novel Building Materials
No full textThe proper choice of building envelope material may optimize building energy efficiency and indoor–outdoor comfort conditions in the built environment, together with its environmental sustainability. Therefore, a deep and multidisciplinary understanding of building envelopes and the new potentialities associated to building materials is needed in order to design green and smart constructions. In this perspective, the present chapter concerns, firstly, basics of building physics about hygro-thermal, acoustics, and lighting performance of the built environment. Then the main building material properties and the key traditional and innovative typologies are assessed with a specific focus on energy efficiency and environmental sustainability targets
Development of phase change materials for new generation building materials.
No full textTEZ8630Tez (Yüksek Lisans) -- Çukurova Üniversitesi, Adana, 2012.Kaynakça (s. 67-71) var.ix, 71 s. : rnk. res. ; 29 cm.This study aims to improve thermal performance of concrete mixes, while keeping their mechanical strength, by adding Phase Change Materials (PCM). Microencapsulated paraffin with phase change temperatures of 26 C and 23 C and latent heat of 110 J/g was used as PCMs. For the concrete mixes with PCM developed here, it was seen that rheoplastic property was improved with increasing PCM content. Mechanical strength of concrete mixes with different PCM ontents were decreased with respect to a blind (no PCM) sample from correponding concrete class of C85 to C60. Heat stored by all the concrete mixes with PCM was measured to be higher than the blind sample and the maximum value was attained as 7750 J for conctrete mix with 10%PCM, even though it had the lowest mass of all the samples. Hidration heat and temperature easurement experiments also revealed that PCM had an enhancing effect, but these results need to be onfirmed with longer duration experiments. The results achieved show that the concrete mixes with PCMs are candidate products that can conserve energy from heating in winter and cooling in summer for building industry. Reduction of fossil fuel consumption in buildings, which is the second largest energy consuming sector in Turkey, can lead to significant reduction of greenhouse gases that lead to climate change.Bu çalışmada beton karışımlarda Faz Değiştiren Madde(FDM) kullanımıyla mekanik dayanımını koruyarak ısıl performansının iyileştirilmesi amaçlanmıştır. FDM olarak, faz değiştirme sıcaklıkları 26 C ve 23 C ve gizli ısı değerleri 110 J/g olan mikrokapsüllenmiş parafin kullanılmıştır. Geliştirilen FDM'li beton karışımlarda FDM miktarının artmasıyla betonun yayılma ve reoplastik görünümlerinde iyileşme olduğu gözlenmiştir. Değişen FDM miktarlarına göre hazırlanan beton karışımlarının şahit (FDM'siz) numuneye göre basınç ukavemetinde C85'den C60 beton sınıfına kadar düşüş meydane gelmiştir. FDM'li tüm beton karışımların depoladıkları ısının şahit örnekten daha yüksek olduğu ve en yüksek değerin, hepsinden daha düşük kütlesi olmasına rağmen, 7750 J ile şahitten %78 daha fazla olarak, %10 FDM'li beton karışımda elde edilmiştir. Hidratasyon sıcaklığı ve ısısı ile yapılan denemelerde de FDM'nin artırıcı etkisi olduğu görülmüştür, ancak bu sonuçların uzun süreli deneylerle tekrarlanması gereklidir. Elde edilen sonuçlar, FDM'li beton karışımların yapı endüstrisinde kışın ısıtma ve yazın soğutma enerjisinden tasarruf sağlayacak bir ürün olmaya aday olduğunu göstermektedir. Ülkemizde enerji tüketiminde ikinci büyük sektör olan binalarda yaygın olarak kullanılan fosil yakıt tüketiminin azaltılmasıyla iklim değişikliğine yol açan sera gazlarının misyonu da önemli miktarda azaltılabilecektir.Bu çalışma Ç.Ü. Bilimsel Araştırma Projeleri Birimi tarafından desteklenmiştir. Proje No: FEF2010YL21
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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