| Summary: | 碩士 === 國立臺灣大學 === 機械工程學研究所 === 97 === Solar-collecting system with ejection-cooling technology is a meliorating project on new energy development. Generator provides power for the whole system. When generator receives external heat, it steams the working fluid which drives the cooling operation. However, this operation also reduces internal capacity of the working fluid simultaneously. Hence we use the circulator pump to provide stable flow to the generator.
This study is to develop circulator pump that controls liquid level, reform the current circulator pump on ejection-cooling system and reduce power-consuming. Owing to complicated actual ejecting-cooling system, a small liquid-control system is used for simulation experiments. First, the performance of the circulator pump is test. The result shows that while working at pressure drop 503 kPa and rotation speed from 2000 RPM to 3000 RPM, within 50 W power consumption, the circulator pump can provide the flow rate over 0.8 LPM which is enough for ejection-cooling system. Second, the dynamic model of liquid level system is analyzed to get theoretical dynamic model of liquid level system. Third, according to different condition, the optimum control parameters are used to control system stably. Based on the results of the experiments, circulator pump can accurately control liquid level of generator, and can resist external flow turbulent from 0.5 LPM to 0.9 LPM. In general, the performance of designed liquid level controller is well.
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