PERFORMANCE ANALYSIS OF A THERMOSIPHON CHARGED WITH DEIONIZED WATER/ ETHYLENE GLYCOL MIXTURE BASED GRAPHENE NANO PLATELET NANOFLUID

Abstract

The thermosiphons are wickless heat pipes which work under gravity force. Different working fluids like water, engine oil, ethylene glycol are used in this equipments. Nanofluids including various nano particles are also used in the thermosiphons. In this study, deionized water (DW)/ ethylene glycol (EG) mixture based graphene nano platelet (GNP) nanofluid was charged in a thermosiphon and thermal performance analysis was performed. The mixing rate of DW:EG was 95:5 while the particle concentration was 1 %. Triton X-100 was added to the mixture as surfactant. To specify the effect of GNP, a set of experiments for both DW+EG and DW+EG+GNP nanofluid were carried out at the same operating conditions. The results show that GNPs had a positive effect on the performance of the thermosiphon. The presence of GNP in the base fluid was decreased the thermal resistance while it was increased the thermal efficiency of the thermosiphon. The maximum efficiency value was reached as 57.1 % when the nanofluid used. At the same condition, the efficiency was 49.5 % when the working fluid was DW+EG mixture.

Keywords

• Thermosiphon
• Ethylene glycol
• Graphene
• Nanofluid
• Efficiency

Deiyonize Su/ Etilen Glikol Karışımı Bazlı Grafen Nano Plaka İçeren Nanoakışkan ile Şarj Edilen Bir Termosifonun Performans Analizi

Öz

Termosifonlar yer çekimi altında çalışan fitilsiz ısı borularıdır. Bu ekipmanlarda su, motor yağı, etilen glikol gibi farklı çalışma akışkanları kullanılmaktadır. Termosifonlarda çeşitli nano parçacıklar içeren nano akışkanlar da kullanılmaktadır. Bu çalışmada, deiyonize su/etilen glikol karışımı bazlı grafen nano plaka içeren bir nano akışkan termosifona şarj edildi ve ısıl performans analizi yapıldı. Deiyonize su/etilen glikol karıştırma oranı 95:5 iken partikül konsantrasyonu %1 idi. Karışıma yüzey aktif madde olarak Triton X-100 ilave edildi. Grafenin etkisini belirlemek için, aynı çalışma koşullarında hem DW+EG hem de DW+EG+GNP nanoakışkanı için bir dizi deney yapılmıştır. Sonuçlar grafenin termosifon performansı üzerinde olumlu bir etkiye sahip olduğunu göstermiştir. Baz akışkanda grafen bulunması, termosifonun ısıl verimini artırırken ısıl direncini azaltmıştır. Nanoakışkan kullanıldığında maksimum verim değerine % 57.1 olarak ulaşılmıştır. Aynı durumda, çalışma akışkanı DW+EG karışımı olduğunda verim % 49.5 olmuştur.

Anahtar Kelimeler

• Termosifon
• Etilen Glikol
• Grafen
• Nano akışkan
• Verimlilik

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