Radiant cooler based on direct absorption and latent heat transfer, methods of forming and operating the same

Patent metadata

Field	Value
Publication number	US-11333433-B2
Application number	US-201816636871-A
Country	US
Kind code	B2
Filing date	Oct 23, 2018
Priority date	Oct 23, 2017
Publication date	May 17, 2022
Grant date	May 17, 2022

Abstract

Various embodiments may relate to a radiant cooler. The radiant cooler may include a chamber. The radiant cooler may also include a vacuum pump connected to the chamber. The radiant cooler may further include an infrared absorber arranged within the chamber. A wall of the chamber may be configured to allow at least a portion of infrared light to pass through. The vacuum pump may be configured to generate a vacuum in the chamber. The infrared absorber may include a fluid, i.e. a liquid, configured to evaporate into the vacuum upon receiving thermal energy from at least the portion of infrared light.

First claim

The invention claimed is:

1. A radiant cooler comprising:
a chamber;
a vacuum pump connected to the chamber; and
an infrared absorber arranged within the chamber;
wherein a wall of the chamber is configured to allow at least a portion of infrared light to pass through;
wherein the vacuum pump is configured to generate a vacuum in the chamber; and
wherein the infrared absorber comprises a fluid configured to evaporate into the vacuum upon receiving thermal energy from at least the portion of infrared light, such that evaporation of the fluid into the vacuum cools the infrared absorber via latent heat transfer associated with a phase change of the fluid from a liquid state to a gas state; and
wherein the vacuum pump is further configured to pump the evaporated fluid in the chamber to an environment external to the radiant cooler.

2. The radiant cooler according to claim 1 ,
wherein the wall of the chamber comprises a film; and
wherein the wall of the chamber further comprises a support configured to support the film.

3. The radiant cooler according to claim 2 , wherein the film is transparent.

4. The radiant cooler according to claim 2 , wherein the film comprises polyethylene (PE).

5. The radiant cooler according to claim 1 , wherein the fluid is water.

6. The radiant cooler according to claim 1 , wherein the fluid is configured to evaporate into the vacuum upon receiving the thermal energy from long infrared waves having wavelengths above 7 μm and below 10 μm.

7. A method of forming a radiant cooler, the method comprising:
forming a chamber, a wall of the chamber configured to allow at least a portion of infrared light to pass through; and
arranging within the chamber an infrared absorber; and
connecting a vacuum pump to the chamber;
wherein the vacuum pump is configured to generate a vacuum in the chamber; and
wherein the infrared absorber comprises a fluid configured to evaporate into the vacuum upon receiving thermal energy from at least the portion of infrared light, such that evaporation of the fluid into the vacuum cools the infrared absorber via latent heat transfer associated with a phase change of the fluid from a liquid state to a gas state; and
wherein the vacuum pump is further configured to pump the evaporated fluid in the chamber to an external environment.

8. The method according to claim 7 ,
wherein the wall of the chamber comprises a film; and
wherein the wall of the chamber further comprises a support configured to support the film.

9. The method according to claim 8 , wherein the film is attached to the support.

10. The method according to claim 8 , wherein the film is transparent.

11. The method according to claim 7 , further comprising:
providing the fluid to the infrared absorber.

12. The method according to claim 7 , wherein the fluid is configured to evaporate into the vacuum upon receiving the thermal energy from long infrared waves having wavelengths above 7 μm and below 10 μm.

13. A method of operating a radiant cooler, the method comprising:
activating a vacuum pump connected to a chamber to generate a vacuum in the chamber so that a fluid, the fluid comprised in an infrared absorber arranged within the chamber, evaporates into the vacuum upon receiving thermal energy from at least a portion of infrared light that is allowed to pass through a wall of the chamber, such that evaporation of the fluid into the vacuum cools the infrared absorber via latent heat transfer associated with a phase change of the fluid from a liquid state to a gas state;
wherein the vacuum pump is further configured to pump the evaporated fluid in the chamber to an environment external to the radiant cooler.

14. The method according to claim 13 ,
wherein the wall of the chamber comprises a film;
wherein the wall of the chamber further comprises a support configured to support the film.

15. The method according to claim 14 , wherein the film is transparent.

16. The method according to claim 14 , wherein the film comprises polyethylene (PE).

17. The method according to claim 13 , wherein the fluid is water.

18. The method according to claim 13 , wherein a temperature of the infrared absorber is below 15° C.

19. The method according to claim 13 , further comprising:
providing additional fluid to the infrared absorber for replacing the evaporated fluid.

20. The method according to claim 13 , wherein the fluid is configured to evaporate into the vacuum upon receiving the thermal energy from long infrared waves having wavelengths above 7 μm and below 10 μm.

Assignees

• Agency Science Tech & Res

Inventors

• Isakov Dmitry
• Vong Siew Soon
• Tan jun liang

Classifications

• F25B39/022

  with plate-like or laminated elements · CPC title

• F25D31/00 Primary

  Other cooling or freezing apparatus · CPC title

• F28F2245/06

  having particular radiating, reflecting or absorbing features, e.g. for improving heat transfer by radiation · CPC title

• F25B23/003

  using selective radiation effect · CPC title

• F28F13/18

  by applying coatings, e.g. radiation-absorbing, radiation-reflecting; by surface treatment, e.g. polishing · CPC title