Güneş Kolektörlerinde Nanoakışkanların Kullanılmasının Etkileri

Yenilenebilir enerji kaynaklarından olan güneş enerjisinden faydalanmanın önemi son yıllarda daha fazla anlaşılmaya başlanmıştır. Fosil yakıtların olumsuz çevre etkileri ve miktarlarının sınırlı olması dünya genelinde yenilenebilir enerji kaynaklarına olan talebin artmasına yol açmış ve tüm enerji kaynaklarının temeli olan güneş enerjisinden yararlanmak için çeşitli modellerin ve cihazların üretilmesi hız kazanmıştır. Güneş enerjisinden yararlanmanın en önemli yolu güneş kolektörlerinin kullanılmasıdır. Güneş kolektörleri genel olarak düzlem yüzeyli (DYGK), vakum tüplü (VTGK), parabolik (PGK) ve ısı borulu (IBGK) olmak üzere 4 tipe ayrılmakla birlikte bu tipler de kendi aralarında birçok farklı özelliğe sahip ayrı türlere ayrılabilmektedir. Dünya üzerinde en fazla kullanılan güneş kolektörü tipi Düzlem Yüzeyli Güneş Kolektörü’dür. Bunun en önemli nedenleri arasında ucuz olması, kolayca üretilebilmesi ve çeşitli şekillerde uygulanabilmesi gibi parametreler yer almaktadır. Bununla birlikte düşük ortam sıcaklığı ile ideal olmayan iklim koşullarında DYGK'ların termal verimliliği %40'ın altına düşer. DYGK’ların bu tür dezavantajlarının bulunması Vakum Tüp Güneş Kolektörlerinin üretilmesine yol açmıştır. İlerleyen teknolojiyle birlikte güneş kolektörlerinde ısı borularının kullanılması durumu gündeme gelmiş ve yapılan çalışmalar sonucunda ısı borusu kullanımının verimi iyileştirdiği tespit edilmiştir. Ayrıca güneş kolektörlerinde ve ısı borularında nanoakışkan kullanılması durumu da oldukça yaygınlaşmış olup son dönemlerde özellikle bu konu ile ilgili birçok çalışma yürütülmüştür. Temel amaç her zaman için sistemin performansını iyileştirmek ve verimlilik elde etmektir. Bu sayede güneş enerjisinden en etkili şekilde yararlanılacak ve dünya enerji arzı talebi de yenilenebilir kaynaklar kullanılarak karşılanacaktır.

Effects of Using Nanofluids in Solar Collectors

The importance of using solar energy, one of the renewable energy sources, has started to be understood more recently. The negative environmental effects and limited amounts of fossil fuels have led to increased demand for renewable energy sources worldwide and the production of various models and devices has accelerated to take advantage of solar energy, which is the basis of all energy sources. Using solar collectors as a way to benefit from solar energy has been used for many years. Although solar collectors are generally divided into 4 types as flat plate (FPSC), evacuated tube (ETSC), parabolic (PSC) and heat pipe (HPSC), these types can also be divided into separate types with many different features. The most commonly used solar collector type in the world is Flat Plate Solar Collector. The most important reasons for this are being cheap, easily produced and applied in various ways. Yet, the thermal productivity of FPSCs decreases below 40% in non-ideal climate conditions with low surrounding temperature. The existence of such disadvantages of FPSCs led to the production of Evacuated Tube Solar Collectors. With the advancing technology, the utilization of heat pipes in collectors has come to the agenda and as a result of the studies conducted, it has been determined that the use of heat pipe improves efficiency. In addition, the use of nanofluids in solar collectors and heat pipes has become quite common, and many studies have been carried out especially on this subject recently. The primary objective is always to improve the performance of the system and achieve efficiency. In this way, solar energy will be used in the most effective way and world energy supply demand will be met by using renewable resources.

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Politeknik Dergisi-Cover
  • ISSN: 1302-0900
  • Yayın Aralığı: Yılda 4 Sayı
  • Başlangıç: 1998
  • Yayıncı: GAZİ ÜNİVERSİTESİ
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