Performance Evaluation Methods for Multi-stream Plate-Fin Heat Exchanger

• 作 者: Li Jun Wang Yu Jiang Yanlong Shi Hong Zheng Wenyuan
• 机 构: School of Environmental Science and Engineering,Suzhou University of Science and Technology,College
• 出 处: Transactions of Nanjing University of Aeronautics and Astron
• 发表日期: 2017年05期
• 关键词: multi-stream plate-fin heat exchanger mean square error of accumulative heat loa

Mathematical model of cross type multi-stream plate-fin heat exchanger is established.Meanwhile,mean square error of accumulative heat load is normalized by dimensionless,and the equations of temperature-difference uniformity factor are improved.Evaluation factors above and performance of heat exchanger are compared and analyzed by taking aircraft three-stream condenser as an example.The results demonstrate that the mean square error of accumulative heat load is common result of total heat load and excess heat load between passages.So it can be influenced by passage arrangement,flow inlet parameters as well as flow patterns.Dimensionless parameter of mean square error of accumulative heat load can reflect the influence of passage arrangement to heat exchange performance and will not change dramatically with the variation of flow inlet parameters and flow patterns.Temperature-difference uniformity factor is influenced by passage arrangement and flow patterns.It remains basically unchanged under a certain range of flow inlet parameters.

Mathematical model of cross type multi-stream plate-fin heat exchanger is established. Meanwhile, mean square error of accumulative heat load is normalized by dimensionless, and the equations of temperature-difference uniformity factor are improved. Evaluation factors above and performance of heat exchanger are compared and analyzed by taking aircraft three-stream condenser as an example. results demonstrate that the mean square error of accumulative heat load is common result of total heat load and excess heat load between passages .So it can be influenced by passage arrangement, flow inlet parameters as well as flow patterns. Dimensionless parameter of mean square error of accumulative heat load can reflect the influence of passage arrangement to heat exchange performance and will not change dramatically with the variation of flow inlet parameters and flow patterns. Temperature-difference uniformity factor is influenced by passage arrangement and flow patterns. It remains basically unchang ed under a certain range of flow inlet parameters.