Faruk YEŞİLDAL, Ahmet Numan ÖZAKIN, Safaa BAAMEL, Ahmad ALAGELE

Parabolik Oluklu Solar Kollektörlerin Termal Verimliliğinin Artırılması: Genel Bakış

Bu çalışmada, parabolik oluklu güneş kolektörlerin termal verimliliğini hem teorik hem de pratik olarak artırmak için çeşitli yöntemler incelenmiştir. Bu yöntemler arasında güneş enerjisini absorbe etme yeteneğini artırmak için emici tüpün yüzey alanını artırmak, ısı transferini iyileştirmek için tüp içine turbülatör yerleştirmek yer almaktadır. Ayrıca emici tüpün yüzeyinden yansımayı azaltmak için seçici kaplamalar kullanarak yansımayı en aza indirmek gibi yöntemler de bulunmaktadır. Bunlara ek olarak, çalışma sıvısı için termal iletkenliği artırmak, emici tüpün şeklini değiştirmek ve kollektör ve yansıtıcı yüzeyin geometrisini iyileştirmek gibi diğer tekniklerin de emicinin termal performansını artırabildiği ortaya konulmuştur. Bu teknikler, parabolik oluklu güneş kollektörünün verimliliğini ve termal performansını artırmaya yol açmaktadır. Ancak aynı zamanda çalışma sıvısının basınç düşüşünü ve malzeme maliyetinde artışı da beraberinde getirmektedir. Bu çalışmada, bu teknikler önceki çalışmaların sonuçlarına bağlı olarak ayrıntılı olarak sunulmuştur.

Anahtar Kelimeler:

Parabolik Oluklu Kollektör, Termal verim, Absorber tüp

Improving the Thermal Efficiency of the Parabolic Trough Solar Collector: An Overview

This article examines various methods to enhance the thermal efficiency of parabolic trough solar collectors (PTCs), both theoretically and experimentally. These methods include increasing the surface area of the absorber tube to increase its ability to absorb solar energy, placing a tube inserts inside the tube to induce turbulence and hence improve heat transfer. Among other methods are also minimization of reflection by using selective coatings on the surface of the absorber tube. Additionally, increasing the thermal conductivity of the working fluid, or modifying or altering the shape of the absorber tube or the reflective surface have also been shown to have improved thermal performance by minimizing energy losses due to conduction, convection, and radiation. All these and similar approaches that address and improve system parameters lead to improved efficiency and thermal performance, but they also entail a pressure drop and increase the cost of the system. In this study, the techniques that are used to improve the thermal efficiency of PTCs are addressed and presented in detail along with the findings of previous studies.

Keywords:

Parabolic Trough Collector, Thermal efficiency, Absorber tube.,

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