Yazar "Koçyiğit, Fatih" seçeneğine göre listele
Listeleniyor 1 - 7 / 7
Sayfa Başına Sonuç
Sıralama seçenekleri
Öğe The evaluating of wind energy potential of Diyarbakır using weibull and rayleigh distribution(INESEG Yayıncılık, 2019) Koçyiğit, FatihIn comparison to fossil fuel that pollutes the lower layer of the atmosphere,wind energy is an alternative clean source of energy. Wind speed is theparameter with primary importance in designing and studying the windenergy conversion systems. In this study, the statistical analysis of theparameters of wind power density and wind speed distribution wasinvestigated using the wind speed data of Diyarbakır province between theyears 2014 and 2018 that were hourly measured by the General Directorateof Meteorology. Wind data are used to derive probability distributions, andtheir distributional parameters are determined. Two probability densityfunctions are suited to the measured probability distributions on a yearlybasis. The Weibull and the Rayleigh models are used to analyze the windenergy potential of the location. This modeling process was evaluatedaccording to R2, RMSE and 2 parameters. In conclusion, the values obtainedby the Weibull model gave better results than the values obtained by theRayleigh model in the wind data analysis of Diyarbakır province.Öğe Makine öğrenimi tabanlı kısa vadeli fotovoltaik çıkış gücü tahminlemesi(TMMOB Elektrik Mühendisleri Odası, 2023) Eryılmaz, Berrin; Kılıç, Heybet; Koçyiğit, FatihFosil yakıt kaynaklarının sınırlı olması ve çevreye zararlı etkilerinin olması nedeniyle fotovoltaik (PV) sistemlerinin kurulumuna olan ihtiyaç giderek artmaktadır. PV sistemlerinin hava koşularına bağımlılığı PV güç çıkışlarında kararsızlığa, gerilim, frekans dalgalanmaları ve kesintilere neden olmaktadır. Bu durum ise PV enerjisinin şebekelere entegrasyonunu zorlaştırmaktadır. Bu yüzden PV güç çıkışını önceden kısa süreli tahmin etmek karşılaşılan zorlukların üstesinden gelmek için çok önemlidir. Bu çalışmanın amacı, literatürde makine öğrenimi modellerinde yaygın olan aşırı öğrenme ve yavaş öğrenme dezavantajlarının üstesinden gelerek daha hızlı öğrenen ve yüksek doğrulukta performans gösteren Gürbüz Düzenlenmiş Rastgele Vektör Fonksiyon Bağlantı (GD-RVFL) ağı modelini kısa vadeli PV çıkış gücünü tahmin etmede kullanmak ve bu kapsamda önerilen modeli 10 farklı makine öğrenimi yöntemi olan Bayesian Ridge Regressor (BRR), Linear Regressor (LR), Gaussian Process Regressor (GPR), Support Vector Machine (SVM), Extreme Learning Machine (ELM), Yapay Sinir Ağı (YSA), Gradient Boosting Regressor (GBR), Random Forest Regressor (RFR), Lasso Regressor (LAR) ve Ridge Regressor (RR) yöntemleri ile karşılaştırılarak modellerinin performansını değerlendirmektir. Yapılan bu karşılaştırma sonucunda GDRVFL’ nin etkinliği diğer 10 makine öğrenimi modeline göre önemli ölçüde daha iyi performans gösterdiği görülmüştür.Öğe PERFORMANCE ANALYSIS OF COOLING SYSTEM WITH HORIZONTAL TYPE GROUND SOURCE HEAT PUMP FOR DIYARBAKIR CONDITIONS(2020) Koçyiğit, FatihIn this study, the performance of the horizontal type ground source heat pump cooling system in the summer was analyzed for cooling the testing area with a size of 9x8x2.8m in Diyarbakır province with a warm climate. Energy and exergy analysis was applied to the system and system units by examining the results obtained in the summer in the evaluated system. The monthly and seasonal mean values of the data in the summer (01.06.2018 / 30.08.2018 ) were taken for 11 node points determined in the installed system. In the energy analysis performed with the results obtained, it was calculated that the energy loss in the system was 2.499kW and the energy efficiency 76.86%. For the system units, the unit operating with the lowest energy efficiency was determined as the compressor. According to exergy analysis applied to the system, it was calculated that the exergy loss of the system was 2.150 kW and the second law efficiency was 20.70%. The compressor was also determined as the unit with the highest exergy loss in the system. Compressor should be prioritized for improvement studies to be planned according to both energy and exergy analysis results. The COP value of the system was found to be 4.05, and it was determined that the system, the use of which was examined in the summer, could be used for Diyarbakır province.Öğe Thermal and mechanical properties of a new insulation composite material(Walter de Gruyter GmbH, 2023) Koçyiğit, Fatih; Kaya, Alaattin Metin; WOS:001033599100001The Taguchi optimization method was used to optimize waste and natural different components such as waste marble dust, expanded perlite, perlite aggregate size, cement, and molten tragacanth in the production of new insulation composite material. Compressive strength, thermal conductivity, abrasion loss, and water adsorption properties of the developed composite material were investigated. Taguchi’s standard L18 array was chosen for optimization of these four components with different levels. Response plots were created using the Taguchi and the optimum test condition was determined. The insulation composite material with the best thermal and mechanical properties was obtained under the condition of waste marble dust (1), expanded perlite (1), perlite aggregate size (1) and molten tragacanth (1). In addition, using the anova (Analysis of Variance), percentage impacts on the mechanical and thermal properties of the test parameters were determined. Statistical values obtained from anova and mathematical models are developed by using multi-linear regression method. It was found that the mathematical model and the experimental results were quite compatible. The optimum test conditions detected were verified by confirmation experiments. Confirmation experiment results were obtained between 99.9 % confidence interval values.Öğe 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, AbidThe 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.Öğe 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, GonzaloThe 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.Öğe Thermo-physical and mechanical properties of clay bricks produced for energy saving(Springer/Plenum Publishers, 2022) Koçyiğit, FatihThis study examined the production of porous and light clay bricks, which have low thermal conductivity and are made of a mixture of 10 wt%, 20 wt%, 30 wt%, 40 wt% pumice, 5 % expanded vermiculite, and clay. Pumice and vermiculite were added to the raw material of the soil brick as additives to create pores and provide thermal insulation in the buildings via the synergistic effect created by pumice and vermiculite. All of the raw materials were analyzed using XRF (X-ray Fluorescence), XRD (X-ray Diffraction), TG/DTA (Thermogravimetric/Differential Thermal Analysis), and SEM-EDS (Scanning Electron Microscopy-Energy Dispersive Spectrometry). Mixtures containing different concentrations of pumice and a constant concentration of vermiculite were prepared, dried, and fired at 950 degrees C for two hours. The properties of the samples were also examined: ignition loss, bulk density, apparent porosity, water absorption, compressive strength, thermal conductivity, and microstructure. The addition of pumice and expanded vermiculite dropped the samples' bulk density from 1.93 g center dot cm(-3) to 1.31 g center dot cm(-3). As the addition of pumice and vermiculite increased, their porosity rates increased by 52 %, whilst their compressive strength decreased by 24 %. However, their compressive strength was higher than the value stated in the standards. The thermal conductivity of the samples containing 40 % pumice and 5 % vermiculite dropped from 1.041 W center dot m(-1)center dot K-1 to 0.439 W center dot m(-1)center dot K-1 exhibiting a decrease of 58 % compared to the reference sample. Consequently, the findings of this research reveal that pumice and vermiculite-added brick samples can be used as an insulation material in construction applications.
