碩士 / 國立高雄海洋科技大學 / 輪機工程研究所 / 100 / This study is mainly focusing on how to control the capacity of cold flow current when it goes through the heat exchanger, while maintaining the fixed hot fluid temperature and reducing the cold fluid flow rate due to the changes of sea water temperature in day and night or different environmental conditions. Under a fixed heat transfer rate of heat exchangers, it will be possible to control pump motor function to reduce the electric power consumption in order to achieve the energy-saving goal.
By taking the parallel-flow, counter-flow, cross-flow, one-shell and two tube pass heat exchangers as examples and varying the inlet temperature of the cold fluid, the mass flow rate and exit temperature of cold fluid will be obtained with known mass flow rate and temperatures of hot fluid, specific heats of hot and cold fluids, overall heat transfer coefficient and total heat transfer area.
Furthermore, an experiment with counterflow-double-pipe heat exchanger is conducted to verify the theoretical results. Initially, the inlet temperatures of the hot and cold fluids are adjusted to fixed values. The exit temperatures of the hot and cold fluids then are measured at varying the mass flowrates of both fluids. The results show that varying the flowrate of hot water, the maximum error of the exit temperature of cold fluid between experimental data and calculated results is less than 3.5% for fixed flowrate of cold water. But the largest deviation for the exit temperature of hot water is up to 7.6%. On the whole, the results of the comparison are still logical. It is expected that the results of this study may facilitate the prospective energy-saving heat exchangers design of ships.
| Identifer | oai:union.ndltd.org:TW/100NKIMT484001 |
| Date | January 2012 |
| Creators | Lioa,Yu-Hsien, 廖育賢 |
| Contributors | Yeh,Rong-Hua, 葉榮華 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 72 |
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