Optimum Design of Cross-Flow In-Line Tube Banks at Constant Wall Temperature

Abstract

For many applications, it is important to transfer a given amount of heat with minimum possible volume of heat exchanger for a given pressure loss and efficiency. In this study, such optimum design of cross-flow in-line tube banks at constant wall temperature is carried out. For this purpose, two different methods, namely, the Gnielinski + Gaddis and Zukauskas methods, for the calculation of heat transfer coefficient and pressure loss in tube banks are used. By prescribing the tube diameter, heat exchanger efficiency, and pressure loss of heat exchanger, the pitch length and tube numbers in the flow direction are determined for the condition of the maximum heat flow per heat exchanger volume. For a given value of total heat to be transferred, the length, the height, and the width of heat exchanger can be determined. Equations for this optimum design are derived using appropriate dimensionless numbers. The methodology of the optimum design is explained for a practical example.

Çapraz Akışlı Paralel Borulu Boru Demetinde Entropi Üretiminin Analitik ve Deneysel Olarak İncelenmesi

“…Bu yöntemlerde genel olarak verilen bir basınç kaybında ve ısı aktarımında minimum ısı eşanjör kesit alanı [3][4][5][6] veya minimum ısı eşanjör hacmi [7][8][9][10] hedef alınmaktadır. Bazılarında ise verilen bir basınç kaybı ve ısı aktarımında minimum eşanjör ilk yatırım ve işletme maliyeti istenmektedir.…”

Determination of the Reference Temperature for a Convective Heat Transfer Coefficient in a Heated Tube Bank

“…The heat transfer degradation can be estimated by using an empirical correction factor, and the Žukauskas correlation can predict existing experimental data when the correlation is combined with the empirical factor developed in the study. Yilmaz et al [29,30] extended and developed the formulas of Gnielinski, Gaddis, and Žukauskas for the calculation of the Nusselt number in tube banks. The main contribution is a unique formula for a wide range of the Reynolds numbers, while the Žukauskas correlations are divided into the Reynolds number subintervals.…”

Effect of spaces between aligned tubes having a semicircular section on heat exchange attributes

“…The findings assured that the fin thickness and flow velocity have the highest effect on acid sedimentation. Yilmaz and Yilmaz [10] studied the effects of different dimensions of in-line isothermal CCT bank on its thermal performance. Yilmaz et al [11] numerically simulated the thermal action of axially finned inline CCT configuration.…”