Yazar "Cuce, Pinar Mert" seçeneğine göre listele

Listeleniyor 1 - 5 / 5
  • Küçük Resim Yok
    Öğe
    Assessment of glass
    (Elsevier, 2024) Cuce, Erdem; Cuce, Pinar Mert; Guclu, Tamer
    Especially for new-generation buildings, since esthetic appearance as well as thermal comfort is essential, glass materials have been widely used as building materials in buildings. Due to its superior optical properties, it is preferred in buildings, especially in window areas. On the other hand, the heat losses and gains and light transmission rates from the glass used in the building envelopes and especially in the window areas are very effective on the energy efficiency of the buildings. Therefore, innovative glass technologies are developed and used in new smart buildings. In this context, the most preferred glass technologies are laminated glass and tempered glass for the building envelope. For window areas, it can be listed as low emissivity glasses, high-technology glasses, vacuum glasses, glasses with phase change materials and insulated glasses.The use of new-generation glass technologies instead of traditional glass technologies provides significant benefits to users regarding economic, environmental, and social effects. © 2024 Elsevier Ltd. All rights reserved.
  • Küçük Resim Yok
    Öğe
    Design, modelling, environmental, economic and performance analysis of parabolic trough solar collector (PTC) based cogeneration systems assisted by thermoelectric generators (TEGs)
    (Elsevier, 2024) Cuce, Pinar Mert; Guclu, Tamer; Cuce, Erdem
    Concentrating solar power systems (CSP) is a very efficient technology for clean and renewable energy production. It basically works on the principle of focusing the sun's rays with the help of a reflective surface. There are two types of CSP systems: point-focused and line-focused. Point-focused ones are parabolic dish collectors and solar towers. Line-focused ones are parabolic trough collectors (PTCs) and linear Fresnel reflectors. It is possible to reach focus temperatures over 1000 degrees C with point-focused CSPs. Line-focused CSP systems are used to obtain thermal and electrical energy at temperatures below 500 degrees C. Among CSP technologies, PTCs are widely preferred. While it can be used alone, it can also be used in combination with other power generation systems by creating hybrid systems. In this regard, hybrid PTC/TEG energy systems created with thermoelectric generators (TEGs) come to the fore. These systems have higher electrical and thermal efficiency values compared to traditional PTCs. In this study, CSP systems, PTCs, TEGs and hybrid solar energy systems-based PTCs were examined in detail. It is concluded from the study that the total thermal efficiency of PTC-TEG hybrid systems can be enhanced by up to %70 with respect to PTC systems.
  • Küçük Resim Yok
    Öğe
    Effect of using hybrid nanofluids as a coolant on the thermal performance of portable thermoelectric refrigerators
    (Elsevier, 2022) Cuce, Pinar Mert; Cuce, Erdem; Guclu, Tamer; Shaik, Saboor; Alshahrani, Saad; Saleel, C. Ahamed
    This study investigated the effect of using hybrid nanofluids as a refrigerant in portable thermoelectric refrigerator applications on thermal performance. For this purpose, a cooling cabinet with an internal volume of 36 L was designed and produced. Then, the Peltier assembly, with a water-cooled block attached to its hot surface, was placed in this cooling cabinet from the middle of its front cover. With the help of a refrigerant, the heat was removed from the Peltier's hot surface and transferred to the atmosphere via a water-to-air heat exchanger. Hybrid nanofluids prepared with Al2O3-TiO2-SiO2 and nanoparticles and water were used as the refrigerant in the system. To evaluate the thermal performances of these hybrid nanofluids, the tests were repeated using water without added nanoparticles as the reference case. According to the results obtained from the experimental study, it was observed that in all cases, tests using nanofluids gave better results than the reference cases. In addition, it was determined that the efficiency obtained from the system increased as the nanoparticle ratio in the mixture increased in all cases. Despite significant improvements in cooling cabinet and cooled product temperatures in hybrid nanofluids, the COP values of the systems are slightly lower than in the reference case due to the Peltier effect. Considering the difference between the first and last temperatures of the cooled cabinet, the greatest improvement compared to the reference situation was determined as 30.3 % in the case of loaded state conditions and in the case of using 2 % Al2O3-TiO2-SiO2-Water nanofluid. For the unloaded conditions, this value was obtained as 25.1 % in the case of using 2 % Al2O3-TiO2-SiO2-Water nanofluid. On the other hand, for the unloaded condition, the lowest COP value was calculated as 0.47 and 0.45 when Al2O3-TiO2-SiO2-Water nanofluid was used in 1 % and 2 % mass fraction, respectively. For the loaded condition, this value was found as 0.48 in the case where 1 % Al2O3-TiO2-SiO2-Water and 0.47 in the case where 2 % Al2O3-TiO2-SiO2-Water nanofluid was used.
  • Küçük Resim Yok
    Öğe
    Methods of fabrication of bionanocomposites
    (Elsevier, 2022) Cuce, Pinar Mert; Cuce, Erdem; Guclu, Tamer
    Petrochemical-based plastic packaging materials that cannot be biodegradable and remain intact in nature for many years and the continuous proliferation of these materials as waste has become an international problem. As a result of this problem, bionanocomposites produced from biodegradable materials represent a new class of nanosized materials with various uses, from various daily uses to food packaging applications. It consists of a biobased component and at least one-dimensional nanosized particles. It differs from nanocomposites with fundamental differences such as preparation methods, functions, biodegradability, biocompatibility, and obtaining methods. In the presented study, the production methods of bionanocomposites are explained with some examples obtained by these methods. Generally, there are four main production methods: in situ intercalative polymerization, solution intercalation, template synthesis, and melt intercalation. With these methods, bionanocomposites can be produced that are homogeneously dispersed and provide major enhancements in mechanical, thermal and water vapor barrier characteristics compared to base polymers. It is capital to use the appropriate method and to make the correct synthesis according to the base polymer used and the type of nanoparticle added, to obtain a homogeneous and nonagglomerated bionanocomposite synthesis. © 2022 Elsevier Ltd. All rights reserved.
  • Küçük Resim Yok
    Öğe
    Thermal and energy analysis of a novel solar updraft tower design with divergent chimney and convergent collector concept: CFD analysis with experimental validation
    (Oxford Univ Press, 2024) Cuce, Pinar Mert; Saxena, Abhishek; Cuce, Erdem; Kontoleon, Karolos J.; Oztekin, Erman K.; Shaik, Saboor; Guo, Shaopeng
    The fact that energy sources are heavily dependent on fossil fuels increases the need for alternative energy day by day. Solar energy is the most popular alternative energy source with massive potential. Solar chimney power plants (SCPP) are one of the systems of interest based on solar energy. SCPP systems are rare systems that can provide 24-hour power output. Their performance has been the subject of constant research since the first pilot plant in Manzanares. Design is crucial for performance figures of SCPPs, and the limitation of climatic parameters causes the system to be approached with different designs. This study makes a 3D CFD model by combining the divergent chimney and convergent collector structure based on the first pilot plant. The solar ray tracing algorithm and the RNG k-e turbulence model are applied and the model equations are solved under dynamic conditions with the reliable software ANSYS FLUENT. After the mesh-independent solution of the model is complete, it is validated with experimental data. The two cases are compared for solar radiation of 1000 W/m2 and environmental temperature of 293 K. A power output of 50.51 kW is achieved for standard pilot sizing. With the new model, the power output rises to 146.34 kW. It is seen that the divergent chimney and convergent collector affect the airflow in the system, increasing the maximum air velocity to 19.363 m/s. In parallel with the experimental data, it is seen that the temperature on the ground exceeds 360 K in the CFD results.