Taguchi yöntemi ve hesaplamalı akışkanlar dinamiği kullanılarak tasarlanan levhalı ısı değiştiricilerin performanslarının karşılaştırılması

Bu çalışmada Taguchi yöntemi ve Hesaplamalı Akışkanlar Dinamiği kullanılarak tasarlanan, havadan havaya, küçük kapasiteli (50-200 m3/h) bir ısı geri kazanım cihazındaki, çapraz akışlı levhalı ısı değiştiricilerin ısıl ve hidrolik performansları karşılaştırılmıştır. Akış etkenliği ve duyulur ısıl etkenliği yüksek olacak şekilde tasarlanan levhalı ısı değiştiricilerin; alt kanal sayısı, kanal yüksekliği, ortalama hava akış hızı ve levha malzemesi değişkenleri belirlenmiştir. Akış etken ve ısıl etken levhalı ısı değiştiricilerde, değişkenler ve değişkenlerin ikinci dereceden etkileşimlerinin dahil edildiği akış etkenliği ve geri kazanılan ısıl güç için denklemler çoklu regresyon analizi ile türetilmiştir. 3-boyutlu levhalı ısı değiştiricilerin farklı hacimsel debilerdeki performansları, sonlu hacimler tabanlı ANSYS/Fluent kullanılarak karşılaştırılmıştır. Levhalı ısı değiştirici tasarımında en etkili değişkenlerin; kanal yüksekliği ve ortalama hava akış hızı olduğu belirlenmiştir. Isıl etken modelde, ortalama %50 daha fazla ısının geri kazanıldığı ve ısıl etkenliğin ortalama %35 daha yüksek olduğu; akış etken modelde ise ortalama 2.5 kat daha az basınç düşümü ve akış etkenliğinin ortalama %10 daha yüksek olduğu görülmüştür. Geri kazanılan ısıl güç ve akış etkenliği birlikte değerlendirildiğinde her iki model için en uygun ortalama akış hızlarının 1.5-2 m/s (~90÷~110 m3/h) aralığında olduğu belirlenmiştir.

Anahtar Kelimeler:

Levhalı ısı değiştirici, Isı geri kazanımı, Duyulur ısıl etkenlik, Akış etkenliği, Taguchi yöntemi, Hesaplamalı akışkanlar dinamiği

Performance comparison of plate heat exchangers designed using Taguchi method and computational fluid dynamics

In this study, thermal and hydraulic performances of cross flow plate heat exchangers, designed using Taguchi method and Computational Fluid Dynamics, in a small capacity (50-200 m3/h) air to air heat recovery device were compared. The plate heat exchangers, which are designed to have high flow effectiveness and sensible effectiveness, number of sub-channel, channel height, average air velocity and sheet material variables were determined. The equations for flow effectiveness and recovered thermal power, including variables and second order interactions of variables, were derived by multiple regression analysis for flow effective and thermally effective plate heat exchangers. The performances of 3-dimensional plate heat exchangers using finite volume based ANSYS/Fluent were compared in different volumetric flow rates. The channel height and average air velocity were determined as the most influential variables in the design of plate heat exchanger. It was found that on average 50% more heat was recovered and thermal effectiveness was on average 35% higher in the thermal effective model, while pressure drop was on average 2.5 times less and flow effectiveness was on average 10% higher in the flow effective model. When the recovered thermal power at the fresh side and flow effectiveness are evaluated together, the optimum average flow velocities for both models was determined to be range of 1.5-2 m/s (~90 ÷ ~110 m3/h).

Keywords:

Plate heat exchanger, Heat recovery, Sensible effectiveness, Flow effectiveness, Taguchi method, Computational Fluid dynamics,

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