下載電子全文宣告This thesis is authorized to indicate in-campus access at 5 years and off-campus access at 5 years
You can not download at the moment.
Your IP address is 184.108.40.206
The defense date of the thesis is 2015-07-22
The current date is 2019-04-23
This thesis will be accessible at 2020-07-22
URN etd-0717115-155716 Statistics This thesis had been viewed 735 times. Download 0 times. Author Chih-Hao Chen Author's Email Address No Public. Department Mechanical Engineering Year 2014 Semester 2 Degree Master Type of Document Master's Thesis Language zh-TW.Big5 Chinese Page Count 83 Title Using Velocity Distributions to Optimize Cooling Tube Arrangements in a Shell-and-Tube Heat Exchanger Keyword Optimal Distribution Cooling Tube Heat Exchanger Shell-and-Tube Velocity Distribution Velocity Distribution Shell-and-Tube Heat Exchanger Cooling Tube Optimal Distribution Abstract In this thesis, we studied cooling tube arrangements of the shell-and-tube heat exchanger used in large motors. The objective is to minimize the number of the cooling tube used in the heat exchanger when the heat exchange performance is specified. We fix the inlet velocities of the heat exchanger and vary the cooling tube number and their locations. There are five schemes of arranging cooling tubes proposed in this study.
Scheme A: Placing cooling tubes according to the velocity field of the shell part. Cooling tubes are placed to the highest velocity locations. Scheme B: Removing cooling tubes according to their heat transfer rate. Cooling tubes with the lowest heat transfer rate will be removed first. Scheme C: Adding cooling tubes row by row. Scheme D-1: The velocity distribution of a empty shell part is sorted. Cooling tubes are placed according to the sorting. Scheme D-2: The heat transfer rates of the cooling tube part is sorted. Cooling tubes are removed according to the sorting. Scheme E: Cooling tubes are placed in "O", "X", and "M" shapes. We compared these five schemes in their influences on the shell-and-tube heat exchanger's performance. The optimal scheme for arranging cooling tubes is desired.
The results show that Schemes A-C are the best among five schemes. Using these three schemes, cooling tube arrangements have similar heat exchange performances. However, Scheme C is the easiest to apply among these three schemes. When Scheme C is used, to maintain a heat transfer performance of 82% and 89% will require a usage of 135 and 180 cooling tubes, respectively. The reduction in cooling tube usage is 57% for 135 cooling tubes and 42% for 180 cooling tubes.
Advisor Committee Kuan-Min Wang - advisor
none - co-chair
none - co-chair
Files Date of Defense 2015-07-10 Date of Submission 2015-07-22