Modelling of air flow and heat transfer in compact heat exchangers

• Autorzy: Cebula, A. , Taler, D.
• Języki publikacji: EN

Abstrakty

EN

The comparison of experimental and CFD results demonstrate that the CFD simulation can be used for design and optimisation of heat exchangers. The study systematically analyses the effect of various design parameters on heat transfer characteristics of the fin-and-tube heat exchanger with two tube rows. The heat transfer in the tube-and-fin heat exchanger was studied using an analytical mathematical model and was also simulated by means of the commercially available CFD code FLUENT. It has been found from the numerical CFD simulation that the second-row finned tube is less effective as the heat transfer surfaces than that in the first row. The heat transfer rate at the second row tube is especially low due to the presence of the wakes in front and behind the tube. Having obtained similar results with both techniques the performance of fin-and-tube heat exchangers with circular and oval tubes in in-line and staggered tube arrangements was simulated using CFD. The influence of heat transfer conductivity of the fin material and the influence of the tube arrangement on the fin efficiency has been evaluated.

Słowa kluczowe

PL

przepływ ciepła; wymiana ciepła; żeberko płytowe wymiennika ciepła

EN

heat exchanger; heat transfer; Plate-fin heat exchanger

• Czasopismo: Archives of Thermodynamics
• Rocznik: 2009
• Tom: Vol. 30, no. 4
• Strony: 45-66
• Opis fizyczny: Bibliogr. 7 poz.,Rys., tab., wz.,

Twórcy

autor

Cebula, A.

autor

Taler, D.

• Cracow University of Technology, Faculty of Mechanical Engineering, Department of Thermal Power Engineering, Al. Jana Pawła II 37, 31-864 Cracow, Poland,

Bibliografia

• [1] SHAH, R.K.; SEKULIĆ D.P.: Fundamentals of Heat Exchanger Design, John Wiley & Sons: Hoboken, New Jersey 2003.
• [2] KRAUS A.D., AZIZ A., WELTY, J.: Extended Surface Heat Transfer, John Wiley & Sons: New York 2001.
• [3] TALER D.: Theoretical and Experimental Analysis of Heat Exchangers with Extended Surfaces, Polish Academy of Sciences, Vol. 25, Monograph No. 3, Cracow 2002.
• [4] WONGWISES S., CHOKEMAN Y.: Effect of fin pitch and number of tube rows on the air side performance of herringbone wavy fin and tube heat exchangers, Energy Conversion and Management, Vol. 46, 2005, 2216-2231.
• [5] TALER D.: Prediction of heat transfer correlations for compact heat exchangers, Forschung im Ingenieurwesen, Vol. 69, 2005, 137-150.
• [6] TALER, D.: Experimental determination of heat transfer and friction correlations for plate fin-and-tube heat exchangers J. Enhanced Heat Transf. Vol. 11, No. 3, 2004, 183-204.
• [7] FLUENT 6.2, Fluent Incorporated, Centerra Resource Park, 10 Cavendish Court, Lebanon, NH 03766.