Browsing by Author "Majidi, Ajab Gul"

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Dimensionless normalized wave power in the hot -spot areas of the Black Sea
(E D P Sciences, 2020-01-01) Majidi, Ajab Gul; Bingölbalı, Bilal; Akpınar, Adem; Rusu, Eugen; Kolhe, M. L.; Majidi, Ajab Gul; BİNGÖLBALİ, BİLAL; AKPINAR, ADEM; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi/İnşaat Mühendisliği Bölümü.; Kolhe, M. L.; 0000-0003-0006-5843; 0000-0003-4496-5974; 0000-0002-5422-0119; AAB-4152-2020 ; AAC-8011-2021; AAC-6763-2019
The main objective of this study is to identify and compare wave power sources in the high potential areas in nearshore and shallow water regions of the Black Sea. To achieve the goal, 23 locations were selected on two parallel lines around 5 m (10 sites) and around 25 m (13 sites) depth along the shoreline. The data needed to do the required analyzes at these locations were produced by using the calibrated nested layered 31-year wave hindcast SWAN model, which is operated between 1979-2009 with CFSR winds. The wave data were collected at a 2-hour time resolution for the sub-grid domains (SD3, SD2, and SD1) developed for the vicinity of Karaburun, Filyos, and Sinop coasts. HeaveBuoy, Oyster, Seabased AB, WaveDragon, WaveStar, Oyster2, and SSG, the most common known wave energy converters, were evaluated in the analysis. To ensure a more comprehensive analysis of the geographic variation of the predicted electrical power for each considered wave energy converter system, dimensionless normalized wave power and efficiency index were calculated separately for each wave energy converter devices at each location. From the results, it is recognized that generally, all the WEC systems performances are decreasing from Karaburun to Sinop while FB1 (13 m depth) the lowest, and KA2 (25 m depth) has the highest wave power capability. The most and the least energetic years were 1998 and 1989, repectively.
Güney Batı Karadeni̇z'de mevcut ve ölçeklendi̇ri̇lmi̇ş dalga enerji̇ dönüştürücüleri̇nden enerji̇ üreti̇mi̇
(Bursa Uludağ Üniversitesi, 2020-10-02) Majidi, Ajab Gul; Akpınar, Adem; Bursa Uludağ Üniversitesi/Fen Bilimler Enstitüsü/İnşaat Mühendisliği Anabilim Dalı.; 0000-0003-0006-5843
Bu çalışmanın ana hedefi; Karadeniz’in enerji potansiyeli yüksek olan Güney batı sahillerinde mevcut 15 adet DED sisteminin (WaveDragon, Pelamis, AquaBuoy, Oyster, Oyster 2, WaveStar, Bottom-fixed Heave Buoy Array, SSG, AWS, Langlee, Oceantec, OE Buoy, Pontoon, Seabased AB ve Wavebob) hangilerinin kurulmasının uygun olduğu, hangi DED sisteminin daha yüksek bir kapasite faktörüne ve uygulanabilirliğe sahip olduğu, hangi derinliklerde hangi sistemin uygun olduğu ve diğerlerine kıyasla daha yüksek bir enerji eldesi sağladığının belirlenmesidir. Bu amaç doğrultusunda, öncelikle çalışma alanında belirlenen her bir istasyonda farklı dalga yükseklik ve farklı periyot aralıklarında dalgaların oluşma olasılık matrisleri üretilmiş ve bu saçılım tabloları DED sistemlerinin güç matrisleri ile ilişkilendirilerek ve her bir istasyonda kurulabilecek her bir DED sisteminin elde edilebilecek dalga enerji çıktısı hesaplanmıştır. Ayrıca, DED sistemlerinin dikkate alınan istasyonlarda uygulanabilirliğinin bir göstergesi olarak kapasite faktörü, verimlilik indeksi ve zaptetme genişliği hesaplanmış ve farklı DED sistemleri için kıyaslanmıştır. Bununla birlikte, mevcut DED sistemlerinin tasarım esaslarından dolayı mevcut dalga koşullarıyla daha uyumlu olması açısından ölçeklendirilmiştir. Cihazların yeniden boyutlandırılmasında Froude ölçeklendirme yasası dikkate alınmış ve bütün cihazlar, 1,0'dan 0,1'e kadar on kez küçültülmüştür. Daha sonra, en yüksek kapasite faktörüne sahip ölçeklendirme faktörü belirlenip, orijinal cihazın performansı ile karşılaştırılmıştır. Sonuçta, enerji üretim miktarı açısından SSG, WaveDragon, Oyster, Oceantec ve Pontoon ve kapasite kullanımı açısından Oyster ve Oceantec diğer dikkate alınan DED sistemlerine kıyasla daha iyi performans göstermiştir. Ayrıca, DED sistemlerin boyutları küçüldüğünde kapasite faktörlerinin yükseldiği, enerji üretimlerinin azaldığı ve Oyster ve Oceantec makinelerinin en uygun cihaz olarak öne çıktığı belirlenmiştir.
Inter- and intra-annual wave energy resource assessment in the south-western black sea coast
(Pergamon-Elsevier Science Ltd, 2021-01-22) Bingolbali, Bilal; BİNGÖLBALİ, BİLAL; Majidi, Ajab Gul; Akpinar, Adem; AKPINAR, ADEM; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi.; 0000-0003-4496-5974; 0000-0003-0006-5843; 0000-0002-5422-0119; AAB-4152-2020; AAC-6763-2019; AAC-8011-2021
This study focuses on the inter- and intra-annual variation in theoretical wave power along the southwestern coast of the Black Sea. Long-term (1979-2009) hindcast developed using the calibrated three-layer nested SWAN model was used for a detailed assessment of wave energy resource. Annual change, monthly and seasonal wave power variability indices were evaluated, and the Optimal Hotspot Index (OHI) was calculated for 62 sites along the coast to rate the hotspot locations. The assessment shows the highest wave energy resources in western Karaburun with higher variability. However, the western Sinop sites have lower wave energy resources compared to western Karaburun sites, in spite of considering the lower variability, these sites are more appropriate for wave energy extraction. The location with the highest potential (KAS 100 m depth) has an average of 8.4 kW/m and a maximum of 1015 kW/m wave power capacity. The east sites of Sinop and Filyos are comparatively less dynamic. Moreover, it was found that the average peak values of wave heights are in February, and the lowest sea state was in June. 2003 was the most, and 1989 was the least energetic years in the 31-year period.
Wave power performance of wave energy converters at high-energy areas of a semi-enclosed sea
(Pergamon-Elsevier Science Ltd, 2021-01-02) Rusu, Eugen; Majidi, Ajab Gul; Bingolbali, Bilal; BİNGÖLBALİ, BİLAL; Akpinar, Adem; AKPINAR, ADEM; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi.; 0000-0003-0006-5843; 0000-0003-4496-5974; 0000-0002-5422-0119; 0000-0001-6899-8442; AAC-6763-2019; B-6766-2011; AAB-4152-2020; AAC-8011-2021
The paper focuses on the performance and determination of optimal installation depths of wave energy converter systems (WECs) in less intensified wave energy locations. Therefore, the study aims to investigate the changes in wave power production performance of different WECs along the coastline of the south-western parts of the Black Sea, a semi-enclosed sea. For this purpose, the data needed was extracted from the dataset produced for the period 1979 to 2009 using a calibrated nested layered wave hindcast SWAN version 41.01AB model forced with CFSR winds. The discussion focuses on the most essential five statistical parameters (dimensionless normalized wave power, efficiency index, capacity factor, capture width and energy production per unit of rated power) that can present an easy and more precise idea about the power production performance of WECs at different depths. The results present that the wave energy resource intensity is generally decreasing gradually from Karaburun to Sinop in the study area; the most energy intensified location is line KA, and the Oceantec WECs shows the best performance in its installation depth range. At different locations and depths, different WECs are more suitable for installation.