| Summary: | 碩士 === 國立勤益科技大學 === 冷凍空調系 === 99 === Scarcity of energy and water resources is the big problem that humanity must face in next fifty years. In order to solve the problem of insufficient traditional water resources supply. Seawater desalination is the most important and widespread solution. In desalination method, either distillation or thin-film method will spend a lot of operation energy. If solar energy or waste heat can be used for seawater desalination energy, not only solve the problem of water shortage but also solve the problem of fossil energy shortage, that’s killing two birds with one stone.
In this study, a solar thermal-driven ejector-type distillation system is proposed. This system use solar thermal energy accumulated from medium temperature solar collector to drive ejector, and using low pressure flash distillation method to produce distilled water. At present we use the fresh water to execute the experiment. For shortening the ejector-type distillation system performance testing schedule, heat source comes from solar collector is replaced temporarily by electric heater.
The ejector is analyzed by the one-dimensional theoretical analysis. In this study, the design point of generator temperature is 105℃, evaporator temperature is 50℃, and condenser temperature is 70℃, under these operating condition, theoretical analysis predict the system can produce 21.74 kg distilled water per hour.
The experimental results show, when generator temperature is 105℃, evaporator temperature is 50℃, condenser temperature is 70℃, nozzle position x is 1 mm, solar thermal-driven ejector-type distillation system can produce 17.4 kg distilled water per hour. If the system operates four hours per day, it will produce 69.6 kg distilled water.
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