碩士 / 國立高雄海洋科技大學 / 輪機工程研究所 / 100 / This main goal of this study is to control the flowrate of the cold fluid while it flows through main water cooler or to fix the cold fluid temperature while reducing its flux, especially under the different weather conditions or the temperature change of ambient water. In other words, in order to save the consumption of electric power and achieve energy conservation, the same heating effect can be achieved by controlling the motor rotation. Employing smooth, four-fin, six-fin, and eight-fin tubes, a heat exchanger with counterflow arrangement is made for the hot water and cold water which serve as the inner and outer working fluids in the test. In addition, with a well-stirred design, the hot water is kept around 70 ℃ in the hot bathing constant-temperature reservoir whereas the cold water temperature is set at 20 ℃. The temperature and pressure differences are recorded as the working fluids are pumped through the test unit. For a fully developed flow, the tested Reynolds number ranges from 200 to 3000. It is shown that the heat transfer characteristics and friction factor of the exchanger with fins are larger than those with smooth tube. The more the fins are used, the better the heat transfer performance will be. It is understood that there is always a great demand on cooling water system for ships. Through this work, it is expected that the efficiency of ship operation can be enhanced and the maximum outcome for ship owners can be obtained.
| Identifer | oai:union.ndltd.org:TW/100NKIMT484019 |
| Date | January 2012 |
| Creators | Pai Yuwen, 白育文 |
| Contributors | Yeh Ronghua, 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 | 79 |
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