【摘要】 分析了空冷凝汽器总传热系数的计算方法,通过迭代计算和设定的误差确定管内凝结换热系数,并将管外换热系数表达成迎面风速的函数,最终得出了总换热系数与迎面风速的关系式。建立了换热面积的目标函数,并进行了变工况计算,得出换热面积随迎面风速、排汽压力的增大而减小,随环境温度的增加而增加。通过分析初始温差ITD、迎面风速与设计气温对换热面积的影响,提出在空冷系统优化设计中,应以初始温差和迎面风速作为变量参数。更多还原

【Abstract】 This paper analysed calculation method of total heat transfer coefficient for air cooled condensers,inner-tube condensation heat transfer coefficient was determined by iterative calculation and setting error,and outer-tube heat transfer coefficient was expressed as a function of windward air velocity,then the relationship between total heat transfer coefficient and windward air speed was received.This paper also constructed the objective function of heat-transfer area and calculated variable conditions,the relationships were that,the bigger the windward air speed and exhaust pressure were,the smaller the heat-transfer area was,but it became bigger with the raize of temperature.At last the effection of initial temperature difference ITD,windward air speed and design temperature for heat-transfer area was analyzed,it concluded that initial temperature difference ITD and windward air speed were used as variable parameters in the air cooling system to optimize design.更多还原