Abstract
The solar humidification-dehumidification system is of high significance to the freshwater supply in remote areas. In the present study, a humidification-dehumidification seawater desalination system combined with the chimney is designed and experimentally evaluated. Main parameters influencing its freshwater productivity are analyzed. It is found from this study that the cooling tower is required to obtain long-term steady freshwater generation. Raising the temperature difference between the evaporation and condensation chambers would lead to the rise of the freshwater productivity. There is a turning wind speed, beyond which increasing the wind speed would lead to the decline of both the freshwater productivity and the thermal efficiency. The turning wind speed is relevant to the ambient humanity and the heating power. Decreasing the heat power would increase the turning wind speed. When the heating power is 4.9 kW, the highest freshwater productivity and the highest efficiency are 48 g/min and 32.14%, respectively.
Highlights
At present, the large-scale applications of seawater desalination mainly include the multieffect distillation, the multistage flash distillation, and the membrane reverse osmosis
It can be found that the reason for the irregular tendency of temperatures inside the condensation chamber is that the cooling water temperature increases as it receives heat from the moist airflow inside the condensation chamber
The solar humidification-dehumidification system is of high significance to the freshwater supply in remote areas
Summary
The large-scale applications of seawater desalination mainly include the multieffect distillation, the multistage flash distillation, and the membrane reverse osmosis These methods are suitable for freshwater demand in large and concentrated areas, as their production cost is closely related to their sizes. The small, distributed, low-cost, and less maintenance desalination methods are of high significance to solve the problem of freshwater shortage in these areas. These areas are always lacking fuel and power. An indirect system is separated into two chambers, viz., a solar collecting and evaporation chamber and a condensation chamber This system can achieve the maximum output of freshwater by controlling the operation parameters [3]. The air is served as the working fluid to transport the evaporated vapor and to generate freshwater
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