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US 12,759,901 B2Granted
Passive freezing desalination driven by radiative cooling
AssigneeThe Regents of the University of California
InventorsXin Huang, Aaswath Pattabhi Raman, Jyotirmoy Mandal
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Abstract
Radiative cooling enabled passive freezing desalination processes are described. High salinity water can be desalinated via radiative cooling-driven freezing desalination. The passive freezing desalination processes can be a complementary method to solar desalination to enable 24-hour, year round passive thermal desalination.
Claims20
A method for desalination comprising:
- contacting a water source with a radiative cooling surface, wherein the radiative cooling surface faces outwardly to an atmosphere;
- wherein the radiative cooling surface comprises a thermal emitter with an emissivity from 0.5 to 1 at an electromagnetic wavelength range from 8 μm to 13 μm;
- freezing the water source via radiative cooling to form ice and brine;
- wherein the radiative cooling transfers heat from the water source to the atmosphere via the radiative cooling surface;
- and
- obtaining desalinated water by thawing the ice, wherein the desalinated water has a salinity lower than the water source.
3 more elements
A desalination system comprising:
- a water source;
- a radiative cooling surface in contact with the water source;
- wherein the radiative cooling surface faces outwardly to an atmosphere, and is configured to transfer heat from the water source to the atmosphere and to freeze the water source;
- wherein the radiative cooling surface comprises a thermal emitter with an emissivity from 0.5 to 1 at an electromagnetic wavelength range from 8 μm to 13 μm;
- and
- a collecting system configured to collect ice from the frozen water source, wherein the ice comprises desalinated water.
3 more elements
A hybrid desalination system comprising:
- a desalination system comprising:
- a water source;
- a radiative cooling surface in contact with the water source;
- wherein the radiative cooling surface faces outwardly to an atmosphere, and is configured to transfer heat from the water source to the atmosphere and to freeze the water source;
- wherein the radiative cooling surface comprises a selective thermal emitter with an emissivity from 0.5 to 1 at an electromagnetic wavelength range from 8 μm to 13 μm, and an emissivity from 0.5 to 1 at an electromagnetic wavelength range from 0.3 μm to 2.5 μm;
- and
- a collecting system configured to collect ice from the frozen water source,
- wherein the ice comprises desalinated water;
- and
- a solar thermal desalination system;
- wherein the solar thermal desalination system desalinates during daytime and the desalination system desalinates during nighttime.
8 more elements
Dependencies are inferred from the claim text.