Effects of Wind on Hot Air Recirculation (HAR) Behavior
作者： Leila Borghei , Ramin Haghighi Khoshkho
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMM.110-116.2067
关键词:
摘要: The air-cooled condenser system is impacted greatly by many factors such as the wind speed, the direction of wind and arrangement of site equipments. This paper concentrates on the hot air recirculation phenomenon and its dependence on ambient winds are numerically simulated by using the computational fluid dynamics code, FLUENT. In this paper, two different wind directions (case A and case B) and wind speeds are considered: Results show that the hot air recirculation increases with the increment of velocity speed. Case A has a critical wind direction angle. Wind causes an air temperature increase at the fan inlet due to hot air recirculation, resulting in the deterioration of the heat transfer performance. The hot air recirculation is the main factor responsible for the reduction of heat rejection rate. In case A, fan inlet temperature is higher than case B. The peak value of the HAR occurs at 9 m/s in case A.
harvard.edu
sci-hub.se 参考文章(11)
Detlev G. Kroger, Air-Cooled Heat Exchangers and Cooling Towers: Thermal-Flow Performance Evaluation and Design ,(1999)
C.G. du Toit, G.D. Thiart, D.G. Kröger, ANALYSIS OF RECIRCULATION IN MECHANICAL-DRAUGHT HEAT EXCHANGERS Experimental Thermal and Fluid Science. ,vol. 7, pp. 131- ,(1993) , 10.1016/0894-1777(93)90123-Z
H.W. Krüs, J.O. Haanstra, R. van der Ham, B.Wichers Schreur, Numerical simulations of wind measurements at Amsterdam Airport Schiphol Journal of Wind Engineering and Industrial Aerodynamics. ,vol. 91, pp. 1215- 1223 ,(2003) , 10.1016/S0167-6105(03)00079-5
J. A. van Rooyen, D. G. Kröger, Performance Trends of an Air-Cooled Steam Condenser Under Windy Conditions Journal of Engineering for Gas Turbines and Power-transactions of The Asme. ,vol. 130, pp. 023006- ,(2008) , 10.1115/1.2771567
K. Duvenhage, J.A. Vermeulen, C.J. Meyer, D.G. Kröger, Flow distortions at the fan inlet of forced-draught air-cooled heat exchangers Applied Thermal Engineering. ,vol. 16, pp. 741- 752 ,(1996) , 10.1016/1359-4311(95)00063-1
K. DUVENHAGE, D. G. KRÖGER, Plume Recirculation in Mechanical-Draft Air-Cooled Heat Exchangers Heat Transfer Engineering. ,vol. 16, pp. 42- 49 ,(1995) , 10.1080/01457639508939862
C.A. Salta, D.G. Kröger, Effect of inlet flow distortions on fan performance in forced draught air-cooled heat exchangers Heat Recovery Systems and CHP. ,vol. 15, pp. 555- 561 ,(1995) , 10.1016/0890-4332(95)90065-9
K. Duvenhage, D.G. Kröger, The influence of wind on the performance of forced draught air-cooled heat exchangers Journal of Wind Engineering and Industrial Aerodynamics. ,vol. 62, pp. 259- 277 ,(1996) , 10.1016/S0167-6105(96)00082-7
C.J. Meyer, Numerical investigation of the effect of inlet flow distortions on forced draught air-cooled heat exchanger performance Applied Thermal Engineering. ,vol. 25, pp. 1634- 1649 ,(2005) , 10.1016/J.APPLTHERMALENG.2004.11.012
C. M. Chu, A Preliminary Method for Estimating the Effective Plume Chimney Height above a Forced-Draft Air-Cooled Heat Exchanger Operating under Natural Convection Heat Transfer Engineering. ,vol. 23, pp. 3- 12 ,(2002) , 10.1080/014576302753605321