摘要
借鉴无相变逆流换热器对数平均温度的推导方法,导出了无相变换热器中流体及换热管内、外壁的温度分布,并基于热力学第一、第二定律及非平衡热力学理论,以某高压加热器过热段为例,分别求出了换热过程中蒸汽至管外壁和管内壁至给水的传系数,从传递的角度分析了无相变管壳式换热器的换热性能,为优化换热器结构提供了理论参考依据.
Using the developing method of logarithmic mean temperature in counter flow heat exchanger without phase change for reference, the temperature distribution of fluid, inner wall and outer wall of the heat exchanger without phase change was developed. Then taking the superheating section of certain high- pressure heater as an example, the exergy transfer coefficients in the process of heat transfer from steam to outer wall of the tube and from inner wall of the tube to feedwater were calculated separately on the basis of the first, the second thermodynamic laws and the non-equilibrium thermodynamics theory. The heat transfer performance of the shell and tube heat exchanger without phase change was analyzed from the view of exergy transfer, providing the theory evidence for structure optimization of heat exchanger.
出处
《动力工程》
CSCD
北大核心
2009年第11期1023-1026,共4页
Power Engineering
关键词
管壳式换热器
温度分布
[火用]传递
传[火用]系数
换热性能
shell and tube heat exchanger
temperature distribution
exergy transfer
exergy transfer coefficient
heat transfer performance
