The study of fin-and-tube heat exchangers with the concept of “partial bypass” under wet condition

• Main Authors: Cheng, Yu-Cheng, 鄭宥澄
• Other Authors: Wang, Chi-Chuan
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/14307789651440235344

碩士 === 國立交通大學 === 機械工程系所 === 101 === This research is for improving the performance of fin-and-tube heat exchangers with the concept of “Partial bypass”. The basic idea of “Partial bypass” is to introduce bypass stream which bypasses the front part to the rear part of the heat exchanger via reducing the contact area of the front part of the heat exchanger. Reducing the contact area of the front part of the heat exchanger will lower the heat transfer performance; however, the heat transfer performance of the rear part is substantially increased. The concept can be implemented with maintaining the heat transfer rate but accompanies with a much lower pressure drop, or it can be applied with the same pumping power but accompanies with a much higher heat transfer rate. By changing the contact area and the type of the heat exchanger to change partial bypass condition, we can observe the impact on the performance of heat transfer and pressure drop under different partial bypass circumstances.