Thermal and fluid dynamic optimization of a CPV-T receiver for solar co-generation applications: numerical modelling and experimental validation

Solar co-generation, i.e., the generation of electricity and heat in a single device by concentrating the sunbeams, has the potential to significantly increase the overall system performance. The main challenge is related to the cooling of solar cells. In order to do so, it is essential to reduce the thermal resistance between the cell and heat transfer fluid. This paper features the optimization procedure of a low-cost custom concentrated photovoltaic thermal (CPV-T) receiver for a parabolic trough collector using silicon solar cells. A finite volume model for the thermal process has been developed. Hence, a fluid dynamic thermal simulation of the receiver is presented. The optimized heat sink tube geometries have been manufactured and tested in a lab environment, allowing for a comparison between modelling and experimental test results. Three possible heat sink geometries have been designed and compared regarding their overall heat transfer coefficient with respect to the non-dimensional pumping power, i.e. the ratio between the overall transferred heat and the energy required for pumping. The overall heat transfer coefficient for a finned heat sink has been increased up to 60% with respect to a baseline case without fins under similar conditions.This project has received funding from SOLAR-ERA.NET Cofund 2 joint call undertaking under the European Union’s Horizon 2020 research and innovation programme. This work has also been supported by Scientific and Technological Research Council of Türkiye (TÜBİTAK) under grant number 219M028. The authors acknowledge the Heat and Environment Laboratory, Mechanical Engineering Department, METU, and the help of Bulent G. Akinoglu and Elsen Aydin. D. Santos acknowledges FI AGAUR-Generalitat de Catalunya fellowship (2022FI_B2_00173).Peer ReviewedPostprint (published version

Determination of forage yield and some plant characteristics of oat (Avena sativa L.) genotypes grown in different locations by biplot analysis

Bu çalışmada, 10 adet yulaf çeşit ve hattının Edirne, Biga ve Tekirdağ lokasyonlarında ot veriminin belirlenmesi, kuru ot veriminin GGE Biplot tekniği ile incelenmesi amaçlanmıştır. Kuru ot verimi bakımından çeşit ve hatlar arasında tüm lokasyonlarda fark önemsiz bulunmuştur. Araştırmanın 2. yılında ise sadece Edirne lokasyonunda farklar önemli bulunmuştur. Kuru ot verimi Tekirdağ lokasyonunda ilk yıl 1.027,12 – 1.427,71 kg/da, ikinci yıl 1.419,31 – 2.221,81 kg/da Edirne lokasyonunda ilk yıl 1.417,00 – 1.726,00 kg/da, ikinci yıl 1.239,75 – 2.829,50 kg/da ve Biga lokasyonunda ilk yıl 1.234,90 – 1.668,33 kg/da, ikinci yıl 1.014,71 – 1.522,06 kg/da arasında olmuştur. Sonuç olarak, Tekirdağ koşullarında Sebat, Edirne koşullarında Kahraman ve YBVD-24, Biga koşullarında ise Kahraman, Yeniçeri ve YBVD-24 çeşit ve hatları yulafın kuru ot üretimi için yetiştiriciliğinde elverişli olarak belirlenmiştir.In this study, it was aimed to determine the forage yield of 10 oat cultivars and lines in Edirne, Biga and Tekirdağ locations, and to examine the hay yield with GGE Biplot technique. In terms of hay yield, the difference between cultivars in all locations was insignificant. In the second year of the study, the differences were found to be significant only in Edirne location. Hay yield was between 1.027.12 – 1.427.71 kg/da in the first year, 1.419.31 – 2.221.81 kg/da in the second year in Tekirdağ location, 1.417.00 – 1.726.00 kg/da in the first year, 1.239.75– 2.829.50 kg/da in the second year in Edirne location and it was 1.234.90 – 1.668.33 kg/da in the first year, 1.014.71 – 1.522.06 kg/da in the second year in Biga location. As a result, Sebat in Tekirdağ conditions, Kahraman and YBVD-24 in Edirne conditions, and Kahraman, Yeniçeri and YBVD-24 cultivars and lines in Biga conditions were determined as suitable in the cultivation of oats for hay production