Abstract
A major part of our earth is covered by water still the whole world is suffering from a major issue of scarcity of fresh drinkable water especially in remote and desert areas. In 2019, World Economic Forum witnessed scarcity of fresh water as the largest global threat. At places of high humidity, water is present in the form of moisture in the atmosphere. India has a potential to use these atmospheric water extraction techniques due to humid weather at many locations. This chapter presents an overview of various techniques to extract water from atmospheric air. Firstly, solar assisted absorption or adsorption methods have been presented in which chemical desiccant materials are used to absorb or adsorb the moisture at night. This moisture is regenerated by means of solar energy and then stored in the liquid form after passing it through condensing pipe. In the other method, Peltier modules are used to utilize the principle of thermoelectric cooling effect in atmospheric water extraction. The atmospheric air is cooled to its dew point temperature when it is passed through the cold side of modules and the water vapors begin to condense at its dew point temperature. Previous researches have revealed that these water extraction techniques can generate sufficient amount of water from humid air and can be a viable option at remote location after making it cost-effective.
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Mishra, V., Saxena, K. (2021). An Overview of Various Techniques of Atmospheric Water Extraction from Humid Air. In: Kumar, A., Pal, A., Kachhwaha, S.S., Jain, P.K. (eds) Recent Advances in Mechanical Engineering . ICRAME 2020. Lecture Notes in Mechanical Engineering. Springer, Singapore. https://doi.org/10.1007/978-981-15-9678-0_9
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