Browsing by Author "Umdu, Emin Selahattin"

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Economic and Technical Performance Assessment of a Thermal Energy Storage System for Ancillary Services
(Sakarya University, 2022) emin selahattin umdu; LEVENT BILIR; Bılır, Levent; Umdu, Emin Selahattin
Increasing renewables in energy mix results in lower emissions but also increased fluctuations in the electricity grid. Current thermal energy conversion-based systems will stay as main electricity generation in the grid and they will support base loads of the system. Whether these systems are fossil or geothermal sourced they need adaptive technologies to harmonize with the changing network. This study aims to investigate feasibility and performance to satisfy response demands for a proposed thermal energy storage system connected to feed stream of thermal power generation to support ancillary services in a case study in Turkey. Tin is selected as the phase change material for its good inductive properties. It is demonstrated numerically that the evaluated heat storage tank filled with tin provides adequate time for thermal discharging within time limits to benefit from hourly ancillary power market. Using hourly pricing data for entire 2020 it is found that proposed system shows better economic performance than investment requirement of ROI over 11% as stated in various literature for renewable energy systems. Analysis of system economic performance shows a ROI of 16% and NPV is 17.8% higher than required investment.
Citation - Scopus: 5
Geothermal energy in developing countries–The dilemma between renewable and nonrenewable
(Elsevier, 2022) Nurdan H. Yildirim; Emin Selahattin Umdu; Umdu, Emin Selahattin; Yildirim, Nurdan
Geothermal energy the first application of which was based on heating of hammam and space by the Romans in ancient times is now widely used in 88 countries with total 15950 MWe power and 107727 MWt thermal installed capacity. Geothermal energy which takes its energy from the depths of the earth is not affected much by external meteorological factors and therefore its the most important advantage compared to other renewable energy sources can produce almost uninterrupted energy throughout the year. On the other hand extracting this resource and transferring it to the surface is long difficult and costly. In order for a geothermal resource to be a clean environmentally friendly and sustainable energy source the most important thing to do is to reinject the geothermal fluid used in various applications to underground. Only in this way geothermal energy can be considered sustainable. The usage areas of geothermal energy vary depending on the thermodynamic properties of the geothermal fluid. Combined systems should be expanded to increase the efficiency of geothermal systems. In this chapter firstly basic information about geothermal energy and usage areas are given then current technologies and status are presented. The dilemma: renewable or nonrenewable sustainability and future prospect for developing countries are discussed. In the last part basic approaches in the analyses of geothermal systems are illustrated with a case study. © 2022 Elsevier B.V. All rights reserved.
Citation - WoS: 2
Citation - Scopus: 2
Life cycle assessment and life cycle costing approach for building decarbonization by design choices: A case study
(John Wiley and Sons Inc, 2024) Emin Selahattin Umdu; Nurdan H. Yildirim; Poyraz Güzel; Ebru Alakavuk; Duygu Çinar Umdu; Alakavuk, Ebru; Guzel, Poyraz; Umdu, Emin Selahattin; Yildirim, Nurdan; Umdu, Duygu Cinar; Cinar Umdu, Duygu
Decarbonizing the urban environment has two significant challenges: Increasing electricity demand due to the electrification of space heating and increased renewables share in the electricity supply. The European Commission defines a new grid support mechanism for peak-shaving products in renewed Electricity Market Design. This aims to enable a new market tool to stabilize electric supply and demand. This study examines a grid-integrated thermal storage device's technical feasibility and economic performance to meet net zero building (nZEB) definitions. Alternative scenarios considering current national nZEB targets present energy market options and regulations are compared using the life cycle cost and the global warming potentials over the building lifetime. The results show that better building performance is possible even with a low investment increase of 6.7% compared to minimum building standards based on regulations. This enables older building cases to perform similarly with new building targets for Turkish National nZEB. Building electrification using heat pumps and thermal storage systems gives similar economic performances in the long term when a dynamic electricity tariff is available. Adapting the life cycle approach to decision-making in construction contracts can lead to a 50% decrease in building emissions while staying within the same construction budget. © 2024 Elsevier B.V. All rights reserved.
Citation - WoS: 19
Citation - Scopus: 20
Methodological approach for performance assessment of historical buildings based on seismic energy and cost performance: A Mediterranean case
(Elsevier Ltd, 2020) Selin Karagözler Güleroğlu; Mustafa Erkan Karaguler; Ilker Kahraman; Emin Selahattin Umdu; Güleroğlu, Selin Karagözler; Umdu, Emin Selahattin; Karagüler, Mustafa Erkan; Kahraman, İlker
Historic buildings need to be re-functionalized because of environmental factors economic reasons socio-cultural changes. During the re-functionalization-renovation period only the seismic performance of the building is analyzed to sustain the historic building according to law and legislation. However the historic buildings show a considerable energy saving potential. Therefore the performance assessment of historic buildings requires multidisciplinary approach which examines both energy and seismic issues. The study aims to demonstrate how the energy and seismic performance improvement of a re-functioned historic building conducted with an integrated approach based on four phases: 1) evaluating the energy performance of the existing building 2) determining energy & seismic retrofit packages 3) the energy and cost performance evaluation of retrofit packages 4) analyzing the performance of the retrofit measures. A detailed energy simulations used for finding the effects of energy measures that are passive active and their combinations by taking into consideration the historical value of the buildings. Life-cycle cost analysis is applied to find the best retrofit strategy for the historical building case by using the net present value method. The proposed methodology has been applied to a historical building in a Mediterranean City İzmir to find the best retrofit measures for improving the performance of the building. Results show that the implementation of the external wall and applying the new HVAC system are the most effective measures considering both energy seismic and cost performance. The study indicates that an integrated approach can improve both energy seismic and cost performance of the historic buildings. © 2020 Elsevier B.V. All rights reserved.
Mikroalglerin iç mekan co2 seviyesi üzerindeki etkisiyaşar üniversitesi ofisindeki bir deney
(2019) Özbey, Fulya; Kahraman, İlker; Umdu, Emin Selahattin
İnsanların iç mekanlarda çokça zaman geçirdikleri ve iç hava kalitesinin olumlu/olumsuz etkileri pek çok çalışmaya konu olmuştur. Ofislerdeki iyi iç hava kalitesinin çalışanlar üzerindeki pozitif etkileri de çalışmalar yapılarak desteklenmiş, iç hava kalitesini iyileştirmek yönünde pek çok çalışma yapılmıştır. Fotosentezin iç hava kalitesini iyileştirdiği literatür çalışmaları ile kanıtlanmış ve bu bağlamda tez kapsamında fotosentez yaparak karbon tutabilen mikro alglerin iç mekan karbon dioksit seviyesine etkileri Yaşar Üniversitesi'ndeki bir ofis üzerinde ölçülmüştür. Mikro algler ile yapılan çalışmalar ise genellikle laboratuvar ortamında ya da konsept fikirler olup, alglerin iç hava kalitesine katkılarını deney yöntemiyle ölçme bakımından eksik kalmıştır. Bu nedenle, bu tez hem bu konudaki eksikliği kapatmaya katkıda bulunmak, hem de çıkacak sonuçlara bağlı olarak gelecekte iç mekanlarda mikro algleri kullanarak pek çok tasarım alternatifi yapılabilmesi adına bir adım olarak sunulmuştur. Bu tez, Kasım 2018 başından Mart 2019 sonuna kadar iç mekanda iki farklı mikro alg türü ve miktarının (80 L Spirulina sp. ve 50 L Chlorella vulgaris karışımları) iç mekan CO2 seviyesine etkilerinin, kullanıcı sayısı ve doluluk oranı gözetilerek, ölçülmesi üzerine yapılandırılmıştır. Deneyler birer aylık döngüler içinde yapılmış olup, çıkan sonuçlara göre ofisteki CO2 seviyesinin genellikle kabul edilebilir seviyede olduğu, fakat doğal havalandırma bulunmaması nedeniyle kullanıcılarda sıklıkla yorgunluk ve baş ağrısı gibi şikâyetlerin de olduğu gözlemlenmiştir. Farklı türler ve miktarlardaki mikro alglerin CO2 seviyesine etkileri ise, 80 L Spirulina sp. karışımının iç mekandaki CO2 seviyesini iş günlerinde %1 oranında ve hafta sonlarında ise %5'e kadar düşürdüğü ayrıca CO2 artış miktarının hiç alg olmayan zamanlara göre daha yavaş olduğu yönünde olurken, 50 L Chlorella vulgaris karışımının iş günlerinde ve hafta sonlarında CO2 seviyesini düşürmeye yeterli olmadığı yönündedir. Anahtar Kelimeler: iç mekan hava kalitesi, iç mekan CO2 seviyesi, mikroalg, fotosentez, biyolojik azaltım
Model Digital Twin Based Tool for Techno-Economic Analysis of Parabolic Trough Plant with Storage for Integration into Electrical Distribution Network
(Institute of Electrical and Electronics Engineers Inc., 2025) Farzaneh Bagheri; L. J. Yebra; Şafak Baykal; Fatma Nur Vurgec; Rabia Nur Kalem; Cagdas Akarsu; Kardelen Kamisli; Ömer Abaci; Emin Selahattin Umdu; Umdu, Emin Selahattin; Kalem, Rabia Nur; Vurgec, Fatma Nur; Akarsu, Cagdas; Baykal, Safak; Yebra, Luis J.; Bagheri, Farzaneh
This paper presents a Digital Twin analysis of a solar parabolic trough collector (PTC) plant focusing on its integration into electrical distribution networks within the framework of Concentrated Solar Power (CSP). As renewable energy integration becomes increasingly vital innovative methods are necessary to optimize network planning and enhance hosting capacity. This study centered on the TCP-100 facility of Plataforma Solar de Almería (CIEMAT) utilizes advanced modeling simulation techniques and real-time data analytics. The DT framework allows for a comprehensive assessment of the plant's performance under various conditions identifying optimal operating parameters and addressing CSP-specific integration challenges. By exploring the interaction between the concentrated solar plants and the electrical distribution network challenges the research aims to maximize power utilization efficiency while ensuring grid stability. Key contributions include the development of a specialized test tool for CSP integration validated through real-world application within Turkey's GDZ network. © 2025 Elsevier B.V. All rights reserved.
Citation - WoS: 33
Citation - Scopus: 39
Optimization of microalgae panel bioreactor thermal transmission property for building façade applications
(Elsevier Ltd, 2018) Emin Selahattin Umdu; Ilker Kahraman; Nurdan H. Yildirim; Levent Bilir; Umdu, Emin Selahattin; Yildirim, Nurdan; Bilir, Levent; Kahraman, İlker
Microalgae has great potential reducing embedded CO2 emissions of buildings through their entire life cycles by both increasing energy efficiency and actively capturing CO2. The use of closed microalgae photo bioreactors as building components has the added benefits of acting as an effective insulation system. Additionally microalgae can give a dynamic appearance with living dynamic system that also works as an adaptive sunshade. In this study the thermal transmittance (U value) of different photo bioreactors is determined by using experimental design methods for parametric studies. Heat transfer behaviour of the manufactured panel bioreactors at different operational conditions which satisfy both thermal comfort in building and microalgae growth conditions is evaluated. U values between 3.84 and 53.19 W/m2 K are observed in the study. Results show that there is a significant interaction between all main factors (reservoir air layer and reservoir wall thicknesses) and U value. Yet a two-way interaction is observed for only between reservoir and air layer thicknesses. Further air layer thickness has the highest contribution to the U value in the developed model as both a main and synergetic factor. © 2018 Elsevier B.V. All rights reserved.