2003管翅式换热器的不可逆损失分析_闵敬春.pdfVIP

　54 　 11 　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　Vol.54 　№11 　　2003 11　　　　　Journal　of 　Chemical　Industry　and　Engineering 　(China)　　　　　November　2003 1 2 闵敬春 　吴晓敏 1 2 ( 、 , 1000 4) 　　, ..: , ., , .. 　　　　 　TK 124 　　　　　　　A 　043 -1157 (2003)11-1513-05 IRREVERSIBLE LOSS ANALYSIS OF WAVY FINNED TUBE HEAT EXCHANGER 1 2 MINJingchun and WUXia min 1 2 (Dep artment of Engineering Mechanics, Department of Thermal Engineering, Tsinghua University, Beij ing 1000 4, China) Abstract 　This paper deals w ith a w avy finned tube heat exchanger w orking as an air-cooling condenser.The effects of the exchanger geometric dimensions on the irreversible loss in the exchanger are discussed based on the second law of thermodynamics.The irreversible loss is characterized by the sum of the entropy generation caused by the temperature difference between the airflow and exchanger surface and that caused by the air friction pressure drop.The calculation results show that the entropy generation per unit heat transfer rate (ΔS/Q ) increases gently w ith increasing corrugation angle of the fin but is nearly independent of the fin pitch.When the number of tube rows (N )is increased, the ΔS/Q initially decreases, but turns to increase after reaching a minimum at a certain N .The ΔS/Q increases monotonously as the air velocity increases. Keyw rds　heat exchanger, wavy fin, entropy analysis, irreversible loss