ÖzGünümüzde enerji kullanımı çerçevesinde çevre kirliliği ön plana çıkmaktadır. Enerji kullanımı esnasında meydana gelen ve ekosisteme zarar veren bu kirlilikler, fosil yakıtların kullanımı oluşmaktadır. Çevre kirliliğinin sebepleri incelendiğinde; fosil yakıt kullanan içten yanmalı motorlu araçlardan kaynaklı emisyon gazlarının etkisinin önemli düzeyde olduğu görülmektedir. Bu nedenle, enerjinin verimli kullanımı ve çevresel faktörler dikkate alındığında yakıt hücreli elektrikli araçlar giderek yaygınlaşmaktadır. İçten yanmalı motorlu araçlar kadar hızlı ivmelenme beklentisinden dolayı bu araçlarda yakıt hücreleri batarya ve süperkapasitör ile birlikte kullanılmaktadır. Ancak bu araçlarda farklı güç kaynaklarının birlikte kullanımı ile karmaşık güç akışını yönetmek için enerji yönetim sistemlerine ihtiyaç duyulmaktadır. Enerji yönetimi stratejileri ise maksimum verim koşulları dikkate alınarak optimizasyon hedeflerine göre belirlenmektedir. Bu çalışmada, yakıt hücreli araçların farklı enerji yönetim stratejileri incelenmiş olup; enerji yönetim sistemleri belirlenen üç hedef açısından detaylı olarak değerlendirilmiştir. Yapılan çalışma sonucu elde edilen bulgular, enerji yönetim sistemleri ve optimizasyon çalışmalarını konu alan bilimsel ve sektörel faaliyetler için önem arz etmektedir.

In this study, the thermal behavior and performance of pouch type Lithium-Ion Batteries (LIB) which are used in Hybrid Electric Vehicles (HEVs) and Electrical Vehicles (EVs) has been investigated at different discharge rates based on numerical simulations. Numerical simulation was performed through a traditional software package using the dual potential Multi-Scale Multi-Dimensional (MSMD) battery model to analyze the cell discharge behavior and investigate its thermal performance. When the battery load is increased, non-uniform thermal distribution and temperature rise has been observed. Non-uniform thermal distribution causes loss of capacity and performance in the battery. Therefore, an accurate and effective cooling system is required to eliminate nonuniform temperature distribution. This study is a preliminary preparation for cooling system design.

Related to the increasing demand for environmental pollution and electrical energy, combined cycle power plants (CCPP) are increasingly important. So, It is necessary that increasing the performance of power plants, reducing carbon emissions and rising energy production. Any change related to the heat recovery steam generator design is important for essential components of the CCPP because of directly affects the performance of it. In this study, it has explained that the modelling, sensitivity and exergy analysis of a Heat Recovery Steam Generator (HRSG) in a CCPP. In the analyzes, three-pressure HRSG was modelled with the Aspen Plus simulation program. In addition to, sensitivity analyzes were done and evaluated. Also, energy and exergy analyzes were done for each component in the CCPP.

The use of green energy has increased day by day. Environmentally friendly hybrid electric vehicles with low CO2 emissions have gained public attention. However, most battery electric vehicles are still having range problems, and emission values of hybrid electric vehicles are still not at the desired levels. Thus, fuel cell vehicles have gained some attention as good alternatives. The primary energy source for these vehicles is fuel cells, which are used in conjunction with batteries and supercapacitors to increase system performance. The combination of fuel cell + battery, fuel cell + supercapacitor, and fuel cell + battery + supercapacitor systems are currently the most popular topologies in this technology. The performance of these topologies is related to the overall energy efficiency and exergy efficiency of the vehicle model. Energy and exergy are two basic terminologies used to determine system performance and quality. Exergy determines the thermodynamic losses that cannot be determined using energy formulations alone. Thereby, it is very important to use both terminologies together to examine the performance of topologies and to determine any system losses. For this purpose, in this study, fuel cell + battery, fuel cell + supercapacitor, and fuel cell + battery + supercapacitor topologies were prepared and applied for Urban Dynamometer Driving Schedule (UDDS), Highway Fuel Economy Test Cycle (HWFET), New European Driving Cycle (NEDC), and Federal Test Procedure (FTP) driving cycles. Comparisons of these topologies in fuel consumption, power performance, and energy and exergy efficiencies were performed for the driving cycles. Also, energy flow, during the driving cycle, has showed and interpreted for the fuel cell vehicle that is designed and analyzed.