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ISSN Online: 2379-1748

ISBN Flash Drive: 978-1-56700-483-0

ISBN Online: 978-1-56700-482-3

4th Thermal and Fluids Engineering Conference
April, 14–17, 2019 , Las Vegas, NV, USA

Enhanced vacuum freezing for thermal desalination at the triple point

Get access (open in a dialog) pages 1697-1700
DOI: 10.1615/TFEC2019.sol.027407

要約

Nucleating agents are developed to suppress the subcooling of freezing water. By tuning the synthesis parameters of silver copper iodide particles, the capability of subcooling suppression by the nucleating agents is maximized. This is to maintain the actual freezing point of brackish water with nucleating agents close to the triple point temperature of the brackish water. The nucleating agents are applied to a thermally-driven vacuum freezing desalination process under development to minimize the total energy consumption of the desalination process. In this process, freezing and vaporization of water happen simultaneously at the triple point with net-zero thermal energy consumption, where both of the processes generate purified water in form of ice and vapor, correspondingly. The vapor is then compressed to a pressure above the triple point and condensed on ice to produce liquid freshwater. No thermal energy input is required in the simultaneous phase transition processes. To enable simultaneous condensation of vapor and melting of ice, the majority of energy consumption of this technology is used for vapor compression to the triple point pressure or higher from below-triple point pressure in the subcooled vacuum freezing process. The nucleating agents are used to suppress the subcooling and elevate the equilibrium vacuum freezing pressure to decrease the power requirement for vapor compression and the overall desalination process. The enhanced nucleating agents developed can suppress subcooling within 1?C of the theoretical melting point, thus significantly decreasing the desalination energy consumption. Applications that can directly benefit from the use of this desalination technology include seawater desalination, brackish water treatment, as well as fresh water supply for remote communities.