Isı Borulu Güneş Kollektörlerinde Nano Çözelti ile Performansın İyileştirilmesi

Yıl 2019, , 245 - 257, 01.03.2019

Umut Önder Su , Adnan Sözen , Tayfun Menlik

https://doi.org/10.2339/politeknik.512092

Cited By: 6

Öz

Güneş enerjili sistemler, günümüzde çok farklı alanlarda, farklı amaçlar
için yaygın olarak kullanılmaktadır. Güneş enerjili sistemlerin en önemli
elemanı güneş kollektörleridir. Güneş kollektörleri genel olarak düzlem yüzeyli
(DYGK), vakum tüplü (VTGK), ısı borulu (IBGK) ve parabolik (PGK) olmak üzere
dört tipe ayrılmakla beraber en yaygın olarak DYGK kullanılmaktadır. DYGK’nin
verimini etkileyen parametreler; kollektörlerde kullanılan akışkanın ısıl
iletkenliği, ısı kayıpları ve optik kayıplardır. DYGK’ların düşük verimlerinden
dolayı son zamanlarda güneş enerjili sistemlerde VTGK ve IBGK’ların
harmonizasyonu olan vakum tüplü ısı borulu güneş kollektörleri (VTIBGK)
kullanılmaya başlanmıştır. VTIBGK’lar DYGK’lerin termik ve optik kayıplarını
minimize etmekte ve verim artmaktadır. Bu çalışmada Güneş kollektörlerinde
verimi etkileyen diğer bir parametre çalışma akışkanı olup literatürde örneğine
pek rastlanmamış olunan amorf yapıdaki nano partiküller kullanılarak
hazırlanmış nano akışkanların performansa etkisi irdelenmiştir. Son yıllarda
yapılan çalışmalarda nanoakışkanları ısıl sistemlerde ve özellikle ısı
borularında iyi sonuçlar verdiği ve verimlerini dikkate değer derecede
arttırdığı görülmüştür. VTIBK’lerde nano çözelti kullanılması ile düşük ısıl
direnç, yüksek ısıl iletkenlik, yüksek çalışma sıcaklıkları, kısa sürede
istenen sıcaklık değerlerine ulaşılması ve verimin arttırılması
hedeflenmektedir.

Anahtar Kelimeler

Isı Borusu, Güneş Kollektörleri, Nano Çözelti, Nano Akışkan, Performans İyileştirmesi, Güneş enerjisi

Heat Pipe Evacuated Tubular Solar Collector Performance Improvement by Applications Of Nanofluid

Öz

There are many different type of solar energy systems, which are being used widely for different applications. The most important element of these solar systems is solar collector. There are four main types: Flat Panel (FPSC), Evacuated Tube, Heat Pipe and Parabolic. The most popular type is FP, which was invented in 1950s and this type is predominantly used for last three decades not only in residential but also industrial areas. This is because of two main factors: low initial investment and easy usage. Efficiency of FPSCs are mainly effected by 3 parameters: working fluid thermal conductivity, heat losses and optical losses. Due to low efficiency of FPSCs, Evacuated Tubular Heat Pipe Solar Collectors (ETSCs) are now being studied to replace FPSCs. In this type of solar collectors, optical and thermal losses are minimized and performance of the system is better. In this study, ETSCs which are tested by charging Nano fluid were studied and these researches are very limited in the literature. Last studies proved that Nano fluids are increasing thermal efficiency especially in heat pipes. The outcomes from this study shows that using Nano fluids in ETSCs provides following benefits: Low thermal resistance, high thermal conductivity, higher working temperatures, acceleration in reaching working temperature and improvement in efficiency.

Anahtar Kelimeler

Heat Pipe, Solar Collectors, Nano Solution, Nano Fluid, Performance Improvement, Solar Power

Kaynakça

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