Yazar "Gencel, Osman" seçeneğine göre listele

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    Eco-friendly building materials containing micronized expanded vermiculite and phase change material for solar based thermo-regulation applications
    (Elsevier, 2021) Gencel, Osman; Sarı, Ahmet; Ustaoğlu, Abid; Hekimoğlu, Gökhan; Erdoğmuş, Ertuğrul; Yaraş, Ali; Sütçü, Mücahit; Çay, Vedat Veli
    Phase change materials (PCMs) have been widely studied to decrease energy consumption and dependency on fossil fuels that causes environmental concerns, and improve building energy efficiency. In this regard, this study aimed to fabricate structural cement based mortar with indoor thermo-regulation function utilizing form stable PCM (FSPCM). FSPCM was made of micronized expanded vermiculite (MEV) impregnated with Lauric-Myristic acid eutectic mixture (LA-MA). The facile direct impregnation method was used for the production of the FSPCM. The cement-based mortars were then manufactured by replacing the FSPCM with sand at 15%, 30% and 45 wt% ratios. The basic properties of the manufactured cement-based mortars such as physical, mechanical, thermal conductivity, thermal energy storage and thermoregulation performance were systematically investigated. With the incorporation of 45% FSPCM, thermal conductivity (0.42 W/mK), bulk density (1239 kg/m(3)) and compressive strength (56.2 MPa) decreased by 60.93%, 39.2% and 85.94%, respectively. In terms of compressive strength, all samples with FSPCM can meet the standard requirements. Differential Scanning Calorimetry (DSC) analysis revealed that the melting temperature and latent heat of FSPCM and FSPCM-included cement mortar (45 wt%) are 32.16 degrees C and 73.70 J/g and 31.96 degrees C and 18.90 J/g, respectively. The thermoregulation performance test indicated that the produced FSPCM-included cement based mortars are able to provide thermal comfort by minimizing indoor temperature fluctuations and thus saving energy by reducing heating-cooling loads in buildings.
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    Impact of a low thermal conductive lightweight concrete in building: Energy and fuel performance evaluation for different climate region
    (Academic Press Ltd- Elsevier Science Ltd, 2020) Ustaoglu, Abid; Kurtoglu, Kubra; Gencel, Osman; Kocyigit, Fatih
    Evaluation of energy performance of a proposed lightweight concrete, a structural component, in a building application is a novel approach and significant attempt for the future of energy-efficient buildings. Buildings are one of the largest energy consumers in the world. Thermal protection in a building is the most effective way for energy saving. Many stimulatory measures for the spreading of energy savings technologies have been recently applied into the building sectors. In this study, an investigation was carried out based upon an experimental investigation to decide the thermal properties of the lightweight concrete with different ratios of vermiculite. Moreover, analytical simulation to evaluate the energy consumption in a real building application was carried out for various fuels and different climate regions of Turkey. The results show that the most significant reduction in the total heat need occurs in the 4th region, with about 5.6 kWh/m(2)-year for a thickness of 0.2 m. An energy-saving of 7.5% can be achieved in the 1st region. The proposed concrete can provide a significant reduction in energy consumption and can reduce the carbon emission related to the lower energy need of the buildings. The annual saving can increase to 0.61 $/m(2) for LPG in the 4th region. The payback period varies between 1.4 years and 9 years, depending on the fuel. Many OECD countries having a high population pay higher prices for electricity and natural gas compared to Turkey. It means that such an energy-efficient material can save more price due to their higher fuel cost.
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    Neutron Radiation Tests about FeCr Slag and Natural Zeolite Loaded Brick Samples
    (Hindawi Ltd, 2014) Cay, Vedat Veli; Sutcu, Mucahit; Gencel, Osman; Korkut, Turgay
    Neutron shielding performances of new brick samples are investigated. Brick samples including 10, 20, and 30 percentages of ferrochromium slag (FeCr waste) and natural zeolite are prepared and mechanical properties are obtained. Total macroscopic cross sections are calculated by using results of 4.5MeV neutron transmission experiments. As a result, neutron shielding capacity of brick samples increases with increasing FeCr slag and natural zeolite percentages. This information could be useful in the area of neutron shielding.
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    Novel integration of recycled-hemihydrate phosphogypsum and ethyl palmitate in composite phase change material for building thermal regulation
    (Elsevier Ltd, 2024) Koçyiğit, Şermin; Güler, Onur; Hekimoğlu, Gökhan; Ustaoğlu, Abid; Erdoğmuş, Ertuğrul; Sarı, Ahmet; Gencel, Osman; Özbakkaloğlu, Tugay
    This study investigates the properties of novel heat storage gypsum composites composed of waste Hemihydrate phosphogypsum (HP) incorporated with Ethyl Palmitate (EP) Phase Change Material (PCM) at varying concentrations of 25 wt %, 50 wt %, and 75 wt %. The focus of the research revolves around evaluating key characteristics, including leakage properties, chemical stability, microstructural analysis, heat storage characteristics, mechanical properties, and the thermal regulation performance of these novel composites. The investigation of leakage properties aimed to find the optimum EP ratio within the composite structure without causing any potential EP leakage, and it was determined to be 25 wt %. Furthermore, thermal regulation tests are conducted to assess the heat storage and release capabilities of the composites with varying HP/EP content. The latent heat storage of the HP/EP composite was determined as 46.12 J/g, even after the 750th cycle, the value only decreased to 46.03 J/g. With the porosity filling effect of EP additive in HP, as the EP additive increased, the amount of porosity decreased, and the compressive strength values increased by almost 10 %. In hot weather conditions, the EP additive provided a cooler environment between 2 and 4 °C according to thermoregulation results. This study not only holds promise in the context of developing novel heat storage composites for applications in energy-efficient building materials, thermal energy storage systems, and related sustainable technologies but also in harnessing industrial waste byproducts. It particularly highlights the value of HP as a waste material, which has a high potential for evaluation in the production of gypsum and other building materials.
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    Properties of bricks with waste ferrochromium slag and zeolite
    (Elsevier Sci Ltd, 2013) Gencel, Osman; Sutcu, Mucahit; Erdogmus, Ertugrul; Koc, Vandettin; Cay, Vedat Veli; Gok, Mustafa Sabri
    Effect of ferrochromium slag, zeolite and combinations on physical, mechanical, thermal conductivity and microstructure properties of bricks was investigated. They were substituted to brick raw material. Semi-dry mixtures were compressed with 20 MPa. Samples were fired at rate of 5 degrees C/min until 900 degrees C for 2 h. Characterization of fired bricks, density, porosity, water absorption, weight loss, compressive and bending strength, thermal conductivity properties and microstructural and phase analysis of bricks were determined. Mechanical strengths of bricks were higher than 7 MPa. Thermal conductivity of samples decreases 42.3%. Results showed that bricks with zeolite and slag could be used as construction material. (C) 2013 Elsevier Ltd. All rights reserved.
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    Recycling of metallurgical wastes in ceramics: A sustainable approach
    (Elsevier Sci Ltd, 2022) Er, Yusuf; Sutcu, Mucahit; Gencel, Osman; Totic, Ermedin; Erdogmus, Ertugrul; Cay, Vedat Veli; Munir, Muhammad Junaid
    This pioneering study focuses on the production, testing, and comparative assessment of iron-rich metallurgical wastes, including copper slag (CS), rolling mill scale (RMS), and ferrous-metal grinding dust (FGD), incorporated fired clay bricks. For this purpose, the fired clay bricks incorporating CS, FGD, and RMS are prepared considering three different dosages of wastes (i.e., 10 %, 20 %, and 30 % of the weight of clay) and fired at two different temperatures (i.e., 900 degrees C and 1000 degrees C). Various tests were performed to examine different physical, mechanical, durability, and leaching characteristics of bricks. Results show increased porosity and loss-on-ignition of brick samples with increased CS dosage. However, decreased apparent porosity and loss-on-ignition of brick samples are observed with the increased dosages of RMS and FGD. All the brick samples incorporating metallurgical wastes satisfy the compressive strength and water absorption requirements as per ASTM C62 and other building standards. Scanning electron microscopy shows homogeneous and dense microstructures for brick samples incorporating 30 % RMS and FGD dosages. For all the brick samples fired at 1000 degrees C, amounts of heavy metals in the leachates are detected well below the Environmental Protection Agency specified limits. Based on the results, recycling of CS, RMS, and FGD in brick manufacturing is an attractive solution to avoid environmental issues related to landfilling of hazardous wastes and achieve efficient waste management.
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    Thermal energy saving and physico-mechanical properties of foam concrete incorporating form-stabilized basalt powder/capric acid based composite phase change material
    (Elsevier Ltd., 2023) Koçyiğit, Fatih; Bayram, Muhammed; Hekimoğlu, Gökhan; Çay, Vedat Veli; Gencel, Osman; Ustaoğlu, Abid
    The incorporation of phase change materials (PCM) in construction materials for the purpose of thermal energy storage (TES) can prevent temperature fluctuations and enable the conservation of thermal energy in buildings. Accordingly, this study aims to create a novel, environmentally friendly foam concrete incorporating a composite PCM composed of capric acid saturated waste basalt powder. Basalt powder, a byproduct of the grinding or crushing of basalt volcanic rock, was selected as a carrier material due to its high porosity resulting from its lightweight and porous nature. This allowed for the creation of a leak-free composite PCM, which was then integrated with foam concrete made of CEM I 42.5R cement, water, quartz sand, and a foaming agent. BasaltPCM was substituted into the mixture at 50% and 100% by weight of quartz aggregate. Comprehensive evaluations were conducted on the novel foam concretes with regard to their morphological, mechanical, physical, thermal, and TES properties. The results indicate that the incorporation of basalt-PCM causes a minor reduction in the dry unit weight of the mixtures and a reduction in compressive and flexural strength. However, the leakproof basalt powder/capric acid composite displayed a phase transition behavior, melting at 28.5 ◦C with a latent heat of fusion (47.9 J/g), which retained 99.5% capacity after 500 melting-solidification cycles. The specimen with 100 wt% basalt-PCM exhibited a melting temperature and latent heat of 27.8 ◦C and 17.4 J/g, respectively. Additionally, the basalt powder/capric composite exhibited high thermal stability up to 156 ◦C, far above its normal operating temperature. The foam concretes incorporating the basalt-PCM demonstrated solar thermoregulation properties, maintaining a more stable and comfortable indoor temperature. These results suggest that the form-stable PCM-incorporating foam concretes developed in this study can be considered as environmentally friendly building materials for thermoregulation and energy conservation.
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    Thermal performance optimization of lightweight concrete/EPS layered composite building blocks
    (Springer/Plenum Publishers, 2021) Gencel, Osman; del Coz Diaz, Juan Jose; Sütçü, Mücahit; Koçyiğit, Fatih; Alvarez Rabanal, F. P.; Alonso-Martinez, Mar; Martinez Barrera, Gonzalo
    The aim of this paper is to study and optimize the thermal performance of new lightweight and insulating composite blocks (CBlocks). These CBlocks are made up of a central expanded polystyrene (EPS) layer and two lightweight concrete layers with cavities. The aggregate of the lightweight concrete is pumice. A complete corner wall composed of six composite blocks and a specific corner block is numerically analyzed for different thermal conditions. Numerical methods were used in order to obtain the thermal behavior of these CBlocks. On the one hand, material thermal conductivity, convection and radiation inside the cavities were considered in this problem. On the other hand, the variation of the cavities was also taking into account. Finite Element Method (FEM) and Design of Experiments (DOE) have been used to study and analyze this problem. This numerical study reaches the thermal behavior of these new insulating CBlocks and provides new useful information for researchers and builders.