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    Genleştirilmiş perlitin ısı yalıtım teknolojilerinde kullanılabilirliğinin incelenmesi
    (Pamukkale Univ, 2018) Uluer, Onuralp; Karaağaç, İbrahim; Aktaş, Mustafa; Durmuş, Gökhan; Ağbulut, Ümit; Khanlari, Ataollah; Çelik, Damla Nur
    Artan nüfusla birlikte enerji ihtiyacındaki artış, enerji kaynaklarının etkili ve verimli değerlendirilmesini zorunlu hale getirmektedir. Uluslararası projeksiyonlara göre, bilinen rezervlerle dünyadaki en etkili enerji kaynaklarının yaklaşık 100 yıllık ömrü olduğu öngörülmektedir. Enerji kullanımının büyük bir kısmının binalarda olduğu gerçeği, birçok araştırma ile tespit edilmiş olup en büyük kayıp, ısı enerjisinde olmaktadır. Binalardaki ısı enerjinin korunması açısından ısı yalıtım malzemelerine olan ihtiyaç her geçen gün artmaktadır. Bu ihtiyaçları karşılamak için yeni teknoloji ve yeni malzeme arayışları sürmektedir. Bu çalışmada, dünya rezervlerinin %74’ü ülkemizde bulunan perlitin yapı sektöründe ısı yalıtımı amacıyla doğrudan ve/veya diğer yapı malzemelerinin ısıl özelliklerini iyileştirilmek amacıyla takviye malzemesi olarak kullanılabilirliği araştırılmıştır
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    MATHEMATICAL CALCULATION AND EXPERIMENTAL INVESTIGATION OF EXPANDED PERLITE BASED HEAT INSULATION MATERIALS' THERMAL CONDUCTIVITY VALUES
    (Yildiz Technical Univ, 2018) Uluer, Onuralp; Aktaş, Mustafa; Karaağaç, İbrahim; Durmuş, Gökhan; Khanlari, Ataollah; Ağbulut, Ümit; Çelik, Damla Nur
    Thermal resistance can be increased by using proper heat insulation materials. Traditional heat insulation materials do not stand all desired properties. Thus, developing new heat insulation materials is very important. In this study, expanded perlite based heat insulation material was developed as an alternative to the traditional insulation materials. The composition of the developed material was designed and prepared using the theoretical thermal conductivity prediction models. The prepared material was molded in a rectangular shape panel. Thermal conductivities of panels were measured experimentally and the results were compared with the calculated results. Also, the results showed that the developed panels can be used for heat insulation applications. On the other hand, the closest model to the experimental results is the parallel model whose average deviation is 4.22% while the farthest model is the Cheng and Vachon model whose average deviation is 12.43%. It is obtained that parallel and series models are generally in good agreement with the experimental results. Nevertheless, it is seen some deviations between experimental and theoretical calculation results. The theoretical prediction models do not include any processing conditions such as molding and curing. It is thought that these deviations have originated because of the missing processing parameters in theoretical prediction models. As a result of experimental studies, the lowest thermal conductivity value of expanded perlite based panels was obtained 43.5 mW/m.K. Consequently, the heat transfer coefficient of the panels containing expanded perlite can be calculated nearly by the parallel method.
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    Numerical and experimental analysis of parallel-pass forced convection solar air heating wall with different plenum and absorber configurations
    (Emerald Group Publishing Ltd, 2021) Khanlari, Ataollah; Sozen, Adnan; Afshari, Faraz; Tuncer, Azim Dogus; Agbulut, Umit; Yilmaz, Zeynep Aytac
    Purpose Over the recent years, solar energy has received outstanding attention from researchers. Solar energy applications and related large-scale projects are increasing to meet growing global energy demand as an economical, non-polluting and renewable energy source. The purpose of this study is investigating different plenum and absorber configurations of solar air heating wall (SAHW) experimentally and numerically. Design/methodology/approach In this study, various configurations of SAHW have been numerically simulated to determine the most effective design. According to the simulation results, two SAHWs with various plenum thicknesses have been fabricated and tested at different conditions. Findings Numerical simulation results indicated that parallel-flow SAHWs exhibited better performance in comparison with other placements of absorber plate. Regarding to the experimentally attained results, the highest thermal efficiency was reached to 80.51%. Also, the average deviation between experimentally and numerically obtained outlet temperature is 5.5%. Originality/value Considering the obtained results in the present study, designed SAHW has admissible efficiency to be used in various industrial and residential applications such as; air preheating, space heating and drying.
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    A Study on Some Factors Affecting on CO2 Curing of Expanded Perlite Based Thermal Insulation Panel
    (Springer International Publishing Ag, 2018) Durmuş, Gökhan; Uluer, Onuralp; Aktaş, Mustafa; Karaağaç, İbrahim; Khanlari, Ataollah; Ağbulut, Ümit; Çelik, Damla Nur
    Energy, which is needed for every aspect of life, plays a key role for the development of the countries. Countries need to use energy efficiently to be advantageous in the global competition and ensure the sustainable development. Countries using the energy efficiently succeed economically and have leading the field in the competition. The purpose of this study is to put forward to the role and importance of energy efficiency for the sustainable development of the countries. In this study, energy efficiency has been examined conceptually considering the studies in the literature and the role and importance of energy efficiency has been emphasized for the sustainable development of the countries.