| Summary: | 碩士 === 國立勤益科技大學 === 冷凍空調系 === 103 === As global economic and industrial advancement consumes increasing energy, energy and environment problems have become worldwide topics. The ejector distillation system can make use of cheap medium or low temperature heat sources like solar energy and the waste heat from factories or wind power generation to facilitate heating and operation, which can solve not only the problem of water resource but also the problem of increasingly scarce energy.
The object of this study is to explore the influence of the degree of superheat of working fluid on the performance of the ejector in the steam ejector distillation system. The ejector in the steam ejector distillation system in this study adopts a 5.392 mm throat inner diameter(dt) nozzle. With the ejector one-dimension theoretical model, this study analyzed 7 corresponding diffuser inner diameters (d3) under different operation conditions (the saturation temperatures of the generator are 100℃, 105℃, and 110℃; The saturation temperature of the evaporator is 50℃; the saturation temperatures of the condenser are 65℃, 70℃ and 75℃) and manufacture them into entities. The degrees of superheat (5℃, 12℃ and 17℃) of the generator and the evaporator were taken for the experiment, and they were divided into three different combinations of degree of superheat of primary and secondary flow to test the influence on the system. The results showed that a higher degree of superheat of the primary flow leads to a lower entrainment ratio (ω) while it is totally opposite with the secondary flow. If the degree of superheat of the primary flow is fixed while the degree of superheat of the secondary flow changes, each unit degree of superheat can increase the entrainment ratio by 1.67~2.08%/℃ and the distillation water quantity by 0.62~0.725%/℃; if the degree of superheat of the secondary flow is fixed while the degree of superheat of the primary flow changes, each unit degree of superheat can decrease the entrainment ratio by 0.4~0.74%/℃ and the distillation water quantity by 0.4~0.53%/℃; if the main and secondary fluid share the same degree of superheat, each unit degree of superheat can increase the entrainment ratio by 0.681~1.1%/℃ and the distillation water quantity by 0.7~1.5%/℃.
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