Design of circulating distilled water device and experiment on effect of cooling device

Abstract: Water crisis is potentially the most serious environmental problem. Due to the enormously wasteful and therefore non-sustainable use of water, groundwater levels are decreasing at an alarming rate. The water distillation units used in almost every science laboratory, need to use water to cool the steam and thus provide distilled water. Distilled water device is a kind of equipment for preparing distilled water. With the development of science and technology, the demand for distilled water will be larger and larger. However, in terms of either energy efficiency or security, there is a certain gap between water distiller supply and social development requirement. In this paper, a new type of circulating distilled water device is designed. The device consists of 3 parts: distillation unit, cooling device and impounding reservoir, and the 3 components are connected by pipes and pumps to form a loop circulation system. The distillation unit consists of 4 parts: heater, pot of vaporization, steam pipe and condenser; double vacuum insulation panels (VIPs) are used in the heat insulation of the vaporization pot wall. The cooling device consists of 4 parts: cooling plate, fan, impounding reservoir and stainless steel casing. To decrease the temperature of outer wall of the evaporator pan, VIPs are used for the insulation of outer walls. The excellent thermal insulation properties of VIPs make them widely applied in energy conservation fields, especially in building engineering. Experiment shows that double VIPs have good insulation properties and can improve the safety of the device. Theoretical and experimental modal analysis determines the optimal structure of distilled water device and the optimum working parameters during the circulating process. The effects of temperature on cooling device are obtained mainly through accelerated testing. The optimal regularization parameters of cooling device are cooling plate's horizontal angle of 60°, water flow of 43.3 mL/s and fan speed of 6.0 m/s. Outlet water temperature of cooling device is 26°C, which meets the humidity requirements for forming condensation. The device is an improvement on a simple distillation apparatus. It can prevent overheating and accidents effectively. All of the needed components and appliances can be readily bought from the market. It is simple to manufacture, low in cost and dependable in its functions. In this article, the distilled water device is designed as a circulation system, and various structural parameters of cooling device are optimized. The results can provide the reference for improving the structural design of circulating distilled water device, the safety performance of the equipment, the efficient production of distilled water and hence the use of water resources.