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Öğe Açık dikey tip soğutucu teşhir dolabın faz değiştiren malzeme kullanılarak enerji verimliliğinin sayısal ve deneysel olarak incelenmesi(2023) Celik, Ayse Burcu; Pulat, Erhan; Sökmen, Kemal Furkan; Balkan, Çağrı; Coşkun, SalihBu çalışmada kabin boyutları 2500 mm uzunlukta, 2059 mm yükseklik, 920 mm derinlikte olan açık dikey tip soğutucu teşhir dolabının (ADSTD) enerji verimliliğini arttırmak üzere faz değiştiren malzeme (FDM) uygulaması yapılmıştır. TS EN ISO 23953-2 standartlarına göre test edilen FDM uygulaması yapılan dolabın, hava giriş ve çıkış sıcaklıkları, kompresör defrost periyodu ve devreye girme (on), devreden çıkma (off) durumları, paket sıcaklıkları ve enerji tüketimi incelenmiştir. Test verileri üç boyutlu hesaplamalı akışkanlar dinamiği yöntemi kullanılarak doğrulanmıştır. Bu sonuçlara göre, belirtilen kabin boyutlarında soğutucu teşhir dolaplarına uygulanan FDM’nin, geleneksel dolaba göre enerji verimliliğini % 5,10 arttırdığı görülmüştür.Öğe Araç Aydınlatma Sisteminde Yoğuşma Bölgesi Tahmini ve Yoğuşmanın Sayısal Analiz ile Belirlenmesi ve Karşılaştırılması(Osman SAĞDIÇ, 2022) Sökmen, Kemal Furkan; Kocabıyık, Erol; Meşeci, Yunus; Rençber, Onur KadirOtomobil aydınlatma sistemindeki yoğuşma sorunu, sürüş ve sürücü güvenliğini riske atmaktadır. Yetersiz aydınlatma gibi sorunların ana nedenleri arasında yoğuşma önemli bir problemdir. Çalışmamızda araç farlarında yoğuşma sorunu ele alınmıştır. Sıcaklık analizinden elde edilen sonuçlardan yoğuşmanın meydana geleceği bölge tahmin edilmiştir. Yoğunlaşan kütle miktarı hesaplama yöntemi ile hesaplanmıştır. Hesaplamalar sayısal analizle doğrulanöıştır. ANSYS 2022 R2 yazılımında yapılan analizlerde far bileşenlerinde ısı iletim etkileri dikkate alınmıştır. Doğal taşınım için Boussinesq yaklaşımı, radyasyon etkilerini dikkate almak için Monte Carlo yaklaşımı kullanılmıştır. Eleman sayısından bağımsızlık çalışması yapılmıştır. Termal analizler, T?=5 °C ortam sıcaklığında ve zamandan bağımsız olarak RH: %95 tanımlanarak yapılmıştır. Analiz sonucunda iç ortam hava sıcaklık dağılımı, hava akış profilleri incelenmiş ve yoğuşmanın nerede olacağı tahmini yapılmıştır. Daha sonra termal analiz sonuçları başlangıç koşulu olarak tanımlanmış ve 300 saniye lens üzerine 3 °C'de su püskürtülmüştür. Zamana bağşı yoğuşma oluşum analizleri yapılmıştır. Yoğuşma oluştuktan sonra aydınlatma elemanlarına güç tanımı yapılmıştır. Şartnameye göre 1800 saniye içinde yoğuşmanın giderilmesi beklenmiştir. Analizlerde yoğuşmanın tahmin edildiği bölgede oluştuğu, yoğuşmanın oluştuğu bölge literatür ile uyumlu çıkmıştır.Öğe COMPUTATIONAL and TEORIC INVESTIGATION of the EFFECTS of FINNED TRICKLEVENT SYSTEM on BUILDING ENERGY SAVINGS(Kütahya Dumlupinar University, 2022) Sökmen, Kemal Furkan; Ergüner, Burhan; Akin, İlknurIn our study, the effects of the finned Tricklevent passive air condition system on building energy savings were investigated. The system has been patented internationally with the patent number 2013/08326. A 14 m2 sample prototype office room was built for the study. Numerical studies were performed with FloEFD software. Theoretical calculations and numerical work values confirmed each other. In the analyses, independence from mesh was studied. The solar load is defined as 1009 W/m2. Office exterior windows are designed with a thickness of 6 mm and an air gap of 16 mm. In the study, it was determined that there was a fresh air inlet at a volumetric flow rate of 0.024 m3/s in the prototype office. It has been determined that the finned Tricklevent system cools the hot air coming from the outside environment and takes it in with a temperature drop of 5-6 o C. When the system is operated at the same time as the air conditioner, the air conditioner set temperature can be adjusted to higher temperatures, saving 28 kWh/m2 of energy and reducing the carbon footprint by 15.4 kg/m2. With the sequential operation of the system with the air conditioner, 21 kWh/m2 of energy was saved in a 3-hour period, while a carbon footprint of 11.5 kg/m2 was reduced.Öğe Investigation of Fire Scenario According to Jet Fan Type and Different Air Exchange Number in Underground Vehicle Parking Areas with Computational Fluid Dynamics(Bursa Uludağ Üniversitesi, 2022) Bakır, Mustafa Sinan; Sökmen, Kemal FurkanIn this study, fire analysis results of a closed car park under 4 MW fire load according to BS 7346-7, 2013 standard were examined. The effects of 10 and 15 air changes, the use of radial and axial jet fans on the fire were investigated. Analysis were made in PyroSim software. Mesh independence was studied. Large Eddy Simulation model was used as turbulence model. In the analyzes with 10 air changes, the results of the radial fan; velocity was 0.9154 m/s, ave. temperature was 40.13°C, CO gas level is 100 ppm. For axial fan, velocity was 0.9176 m/s, ave. temperature is 38.02°C , CO gas level 61.5 ppm, visibility results were obtained. Visibility distance of 3 m for both fans was obtained. In the analysis with 15 air changes, the results of the radial fan; velocity were 1,324 m/s, ave. temperature was 29.98°C. For axial jet fan velocity was 1,318 m/s and ave. temperature was 28.15°C. Visibility distance and CO amount were determined as 30 m and 1 ppm for both fans. In the study, it was determined that 10 air changes was insufficient for CO rate and visibility. It has been determined that the axial fan is more effective.Öğe Investigation of Tricklevent Innovative Passive Facade Ventilation System in Terms of Thermal Comfort and Energy Saving(Osman SAĞDIÇ, 2022) Sökmen, Kemal Furkan; Ergüner, Burhan; Akin, İlknurIn our study, the effects of the Tricklevent passive ventilation system with the international patent application number 2013/08326 on thermal comfort and energy saving were examined. Tricklevent innovative passive ventilation system is a ventilation system placed on the facade and controlled by an automation system designed vertically or horizontally. In our study, a 14 m2 prototype room with Tricklevent system was built and measurements were taken from places determined by thermocouples as the system was closed-open. The tests were conducted at 11:00 am during the hottest hours of the day on August 15-16, 2021. The system was also analyzed with computational fluid mechanics software. For numerical analysis, the Re number was calculated and it was determined that the flow was turbulent. The k-? turbulence model was used in the analyses. In the analysis, independence from the network was studied. The Discrete Transfer model was used as the radiation model. 1009 W/m2 solar load is defined. The velocity of the ambient air is calculated as 1.94 m/s, the pressure difference is 2.19 Pa and the air flow to be taken from the system is calculated as 0.024 m3/s. According to the results obtained in the tests, it has been determined that when the Tricklevent system is turned off, the indoor temperature exceeds the ambient temperature within 16 minutes with the effect of radiation, and the indoor temperature reaches a maximum of 30 °C in 16 minutes and 34.5 °C after 24 minutes when the system is on. It has been determined that a temperature drop of 2-3 oC is sufficient when Tricklevent Y.P.H.S is on, while the air conditioner should provide a temperature drop of approximately 6.5-7.5 oC when the system is off. It has been observed that the compressor operating time will be longer when the system is off. As a result of the study, it was seen that 14 kWh energy saving was achieved in the prototype room. According to the power of the air conditioner, as a result of not operating the air conditioner for 16 minutes, 16% savings were achieved in a 1-hour period. Depending on the height of the building, the operating time of the air conditioner can be up to 34 minutes with the advantage provided in air flow and temperature. This showed that the energy savings to be made can be between 16-50% in 1 hour time.Öğe Numerical Comparison of Original Design and Finned Natural Convection with Forced Convection in LED Cooling in a Sample Fog Light(Osman SAĞDIÇ, 2022) Sökmen, Kemal Furkan; Kocabıyık, Erol; Mercan, Mehmet; Ergin, AliElectronic components and LEDs used in lighting products have started to work in more and more limited volumes due to aesthetic concerns and design. This has led to the demand for increasingly higher luminous intensity from LEDs. This causes the operating temperature of the LEDs to increase. Therefore, thermal management has become important for LEDs operating at high power. Natural convection method can be used frequently by using heat fins for cooling LEDs. In such cases, forced convection is an alternative solution. In this study, the comparison of natural convection and forced design in a sample fog light was made numerically. In natural convection, the design with fins to benefit from the outside air in the fog lights and the natural convection analysis where there is no design change, the analysis results were obtained by creating the fan definition in the forced design and the air velocity of 10 m/s. In addition, the heat transfer coefficient and temperature results at different fan speeds were obtained and verified with the literature. In the study, our analyzes were carried out by verifying with tests on a different geometry. In the analysis, independence from the number of elements was studied. Numerical analyzes were performed with ANSYS 2022 R2 software. Results were obtained at different fan speeds in forced discharge. While the results obtained in forced transport are confirmed by the literature. It has been determined that the forced convection performance is achieved in LED cooling with the original design and fin, and even better results are obtained with the fin effect. It has been determined in the study that while the LED Tj temperature is 170 °C in natural convection, it is 149 °C in forced convection, but with the design change and the addition of fins, the Tj value can be reduced to 133 °C in natural convection
