Murat ÜNVERDİ, Hasan KÜÇÜK, Mehmet Senan YILMAZ

Mini-Kanallı Gövde Borulu Isı Değiştirici Tasarımı ve Isınan-Soğuyan Gövde Tarafı Deneysel Performanslarının Karşılaştırılması

Bu çalışmada, mini kanallı gövde borulu bir ısı değiştiricide (MK−GBID) ısınan−soğuyan gövde tarafı koşullarında ısı geçişi ve basınç düşümü deneysel incelenmişve karşılaştırılmıştır. İç çapı 30 mm olan gövde tarafında, döndürülmüş üçgen (60°)düzenleme ile oluşturulan 13 borulu bir boru demeti ve %25 kesme oranlı 4 şaşırtmalevhası kullanılmıştır. Kern yöntemine göre tasarlanan ısı değiştiricide bakır borulardan(mini kanal) oluşan boru demetindeki, boruların dış çapı 3 mm, iç çapı 2 mmve L/D oranı 120’dir. Deneylerde, boru tarafı debisi; deneysel j/f sonuçlarına göreen uygun çalışma koşullarında sabit tutulurken, gövde tarafı debileri; 60−600 L/haralığında değiştirilmiştir. Isınan−soğuyan gövde tarafı için elde edilen deneyselısı taşınım katsayıları; literatürde makro borular için önerilen gövde tarafı bağıntılarıylakarşılaştırılmıştır. Deneysel incelenen debi aralıklarında; gövde tarafındakideneysel ısı taşınım katsayıları, ısınan ve soğuyan koşullarda ortalama ~%5 farkile Kern’nin gövde tarafı tasarım bağıntısıyla uyumludur. Isınan−soğuyan gövdetarafı için deneysel sürtünme faktörü sonuçlarının eğilimi benzerdir. MK−GBIDdeısınan−soğuyan gövde tarafı koşullarında; ısı geçişi ve hidrodinamik etkilerin birarada değerlendirildiği yüzey akış alanı iyileştirme faktörüne göre en uygun çalışmabölgesi Res < 1000’dir.

Design of Mini-Channel Shell and Tube Heat Exchanger and Experimental Performance Comparison of Shell-Side under Heating and Cooling

This study experimentally investigated and compared heat transfer and pressure drop on shell side of a mini-channel shell and tube heat exchanger (MC−STHE) under heating− cooling conditions. A tube bundle consisting of 13 tubes with a rotated triangular arrangement (60°) and 4 baffles with a 25% baffle cut were used on the shell side with an inner diameter of 30 mm. The outer and inner diameters and L/D ratio of the copper tubes (mini channel) in the tube bundle of the heat exchanger designed using Kern method were 3 mm, 2 mm and 120, respectively. In the experiments, the tube-side flow rate was kept constant under optimal operating conditions based on the experimental j/f results, while the shell side flow rates ranged from 60 to 600 L/h. The shell side experimental heat transfer coefficients under heating−cooling conditions were compared with the correlations commonly used for macro-tubes in the literature. The experimental heat transfer coefficients on the shell side are in agreement with Kern’s shell-side design correlation in heating−cooling conditions with an average ~5% of difference within the flow rates ranging from 60 to 600 L/h. The shell side experimental friction factors showed a similar tendency under heating−cooling conditions. The optimal operating region for the shell side of the MC-STHE is Res < 1000 based on the surface ﬂow area goodness factor, which allows for the evaluation of heat transfer and hydrodynamic effects together under heating−cooling conditions.

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