Effect Of Cold Inflow On Chimney Height of Natural Draft Cooling Towers
Cold inflow has been recognized as detrimental to the chimney efficiency of natural draft cooling towers and other large diameter chimneys like solar chimney towers. Significant cold inflow has been demonstrated in laboratory to occur even quiescent ambient, and does not require crosswinds to make it happen. For process safety and possible energy savings performance of air-cooled heat exchangers operating under natural convection requires the effective chimney height to be estimated accurately. Temperature and pressure drop data obtained from a model air-cooled heat exchanger with cross-sectional flow areas of 0.56 m2, 1.00 m2 and 2.25 m2 operating under natural convection are presented that indicate significant cold inflow. The reduction in the effectiveness of the chimney of cooling towers means much higher tower shell body, together with structural and engineering costs. Using a wire mesh covering the tower exit area, cold in flow is found to be reduced substantially and the actual height designed can be much less than existing towers for the same duty.
natural draft cooling tower chimney cold inflow wire mesh screen
Chu Chi Ming Md. Mizanur Rahman Sivakumar Kumaresan
School of Engineering and Information Technology, Universiti Malaysia Sabah, Locked Bag No. 2073, 88 School of Engineering and Information Technology, Universiti Malaysia Sabah,Locked Bag No. 2073, 889
国际会议
上海
英文
2458-2468
2010-10-10（万方平台首次上网日期，不代表论文的发表时间）