Part of the book: Food Industrial Processes
A new machine to produce distilled water was provided, which includes a heat pump system and a vacuum system. And in the vacuum system of this new machine, the ejector is the key component. Three kinds of ejectors were studied by using FLUENT software to simulate their parameters. The simulation results showed that a vacuum is formed in the ejector throat, where the speed also reached its maximum value. The optimized ratio between the area of the throat and that of the mixing section can be obtained according to theoretical calculations. The ejector with the ratio 0.0156 can be used to prepare distilled water, and the experimental results show that the energy consumption of 1 kilogram distilled water is lower than 0.3 kWh. In the heat pump system, the capillary is the key component. Five kinds of capillaries were studied by using CFD software to simulate their parameters. The simulation results showed that the larger the degree of supercooling of the refrigerant in the capillary, the larger the liquid volume fraction of the outlet refrigerant. The experimental results show that suitable capillary can greatly improve the efficiency of the system.
Part of the book: Desalination and Water Treatment