Analysis of the Effect of Transparent Covers on Receiver of Cylindrical Parabolic Solar Collectors

Year 2023, , 495 - 502, 05.07.2023

Apdulmutalip Şahinaslan , Mehmet Buruntekin Mesut Öztop

https://doi.org/10.2339/politeknik.955919

Abstract

Parabolic solar collectors with central receiving systems are preferred due to their high efficiency despite their high initial investment and operating costs. In this study, the effect of two glass covers on tubular collector will be investigated, aiming enhancement of cylindrical parabolic solar collectors’ efficiency. By using glass cover it is aimed to decrease losses and increase efficiency. In order to investigate the changes of losses and instantaneous efficiency, a model was constructed considering all parameters of the structure, optical losses, material properties and outdoor climatic conditions. Results of calculations show that the two-cover system is not more efficient than the single cover system at low fluid temperatures between 0 and 500 K and the efficiency of the two-cover system is increased at medium fluid temperatures between 500 and 700 K.

Keywords

Parabolic solar collectors, efficiency of collectors, solar energy, renewable energy sources

Silindirik Parabolik Güneş Toplayıcılarda Alıcı Üzerine Uygulanan Saydam Örtünün Etkisinin Analizi

Abstract

Parabolik güneş toplayıcıları yüksek verimleri sebebiyle tercih edilmekte, diğer uygulamalara göre düşük işletme ve ilk yatırım maliyetleri ile silindirik parabolik güneş toplayıcıları ön plana çıkmaktadır. Bu çalışmada, silindirik parabolik güneş toplayıcılarının veriminin artırılmasına yönelik toplayıcı boru üzerine ikinci cam katmanı uygulamasının etkileri incelenecektir. Bu şekilde kayıpların azaltılarak verimin artması öngörülmüştür. Kayıpların ve anlık verimin değişimini inceleyebilmek için parabolik oluk kollektör sistemini oluşturan yapının tüm parametreleri, optik kayıplar, malzeme özellikleri ve dış ortam iklim şartları dikkate alınarak bir model oluşturulmuş, gerekli hesaplamalar yapılarak sonuçları değerlendirilmiştir. Çalışmanın sonucunda 0–500 K arasındaki düşük akışkan sıcaklıklarında ikinci katmanın bir katmanlı sisteme göre daha verimli olmadığı, 500–700 K arasındaki orta akışkan sıcaklıklarında ise çift katmanlı sistemin veriminin yükseldiği görülmüştür.

Keywords

Güneş enerjisi, parabolik güneş kollektörleri, yenilenebilir enerji kaynakları

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