Cooling systems having an integrated ionic liquid salt dehumidification system

Patent metadata

Field	Value
Publication number	US-11149970-B2
Application number	US-201715798123-A
Country	US
Kind code	B2
Filing date	Oct 30, 2017
Priority date	Oct 28, 2016
Publication date	Oct 19, 2021
Grant date	Oct 19, 2021

Abstract

A cooling systems utilizes an organic ionic salt composition for dehumidification of an airflow. The organic ionic salt composition absorbs moisture from an inlet airflow to produce an outlet airflow with a reduce moisture from that of the inlet airflow. The organic ionic salt composition may be regenerated, wherein the absorbed moisture is expelled by heating with a heating device. The heating device may be an electrochemical heating device, such as a fuel cell, an electrochemical metal hydride heating device, an electrochemical heat pump or compressor, or a condenser of a refrigerant cycle, which may utilize an electrochemical pump or compressor. The efficiency of the cooling system may be increased by utilization of the waste heat the cooling system. The organic ionic salt composition may circulate back and forth or in a loop between a conditioner, where it absorbs moisture, to a regenerator, where moisture is desorbed by heating.

First claim

What is claimed is:

1. A cooling system comprising an ionic liquid dehumidification system comprising:
a) an ionic liquid desiccant composition comprising:
i) an ionic liquid desiccant;
ii) water;

b) a conditioner comprising:
i) a conditioner ionic liquid desiccant conduit having:
an ionic liquid desiccant inlet;
an ionic liquid desiccant outlet;

wherein the ionic liquid desiccant composition flows through the conditioner ionic liquid desiccant conduit;
ii) a conditioner fluid conduit having:
a conditioner fluid inlet;
a conditioner fluid outlet;

wherein a conditioner fluid flows through the conditioner fluid conduit; and
iii) an impermeable exchange membrane configured between the conditioner ionic liquid desiccant conduit and the conditioner fluid conduit;
wherein the conditioner fluid comprises moisture that is transferred through the conditioner impermeable exchange membrane to the ionic liquid desiccant flowing through the conditioner ionic liquid desiccant conduit;

c) a regenerator;
i) a regenerator ionic liquid desiccant conduit having:
an ionic liquid desiccant inlet;
an ionic liquid desiccant outlet;

wherein the ionic liquid desiccant composition flows through the regenerator ionic liquid desiccant conduit;
ii) a regenerator fluid conduit having:
a regenerator fluid inlet;
a regenerator fluid outlet;

wherein the regenerator fluid flows through the regenerator fluid conduit;
i) an impermeable exchange membrane configured between the regenerator ionic liquid desiccant conduit and the regenerator fluid conduit;

d) a compressor that heats the ionic liquid desiccant so that ionic liquid desiccant is heated to a temperature greater than the temperature of ionic liquid desiccant in the conditioner;
wherein the ionic liquid desiccant flowing through the regenerator comprise moisture absorbed from the conditioner that is transferred through the regenerator impermeable exchange membrane to the regenerator fluid flowing through the regenerator fluid conduit;

e) a pump that pumps the ionic liquid desiccant composition in a loop from the conditioner to the regenerator;
wherein the ionic liquid desiccant composition has a lower moisture content at the conditioner fluid outlet than at the conditioner fluid inlet and wherein the ionic liquid desiccant composition has a lower temperature at the conditioner fluid outlet than at the conditioner fluid inlet.

2. The cooling system claim 1 , wherein the ionic liquid desiccant is an organic ionic salt.

3. The cooling system of claim 2 , wherein the organic ionic salt is 1-Ethyl-3-methylimidazolium acetate [EMIM][OAc].

4. The cooling system of claim 2 , wherein the organic ionic salt composition is configured in a binary mixture with water.

5. The cooling system of claim 1 , herein the cooling system further comprises:
a) a condenser; and
b) an evaporator.

6. The cooling system of claim 5 , wherein the compressor is an electrochemical compressor.

7. The cooling system of claim 6 , wherein the electrochemical compressor is a polymer electrolyte membrane compressor and wherein the polymer electrolyte membrane comprises an ionomer.

8. The cooling system of claim 7 , wherein the ionomer comprises perfluorosulfonic acid.

9. The cooling system of claim 1 , further comprising a fuel cell to provide electrical power to the cooling system.

10. The cooling system of claim 9 , wherein the fuel cell heats the ionic liquid desiccant in the regenerator.

11. The cooling system of claim 10 , wherein the fuel cell is a polymer electrolyte fuel cell comprising an ionomer membrane.

12. The cooling system of claim 1 , further comprising a metal hydride electrochemical heat transfer device that heats the ionic liquid desiccant in the regenerator wherein the metal hydride electrochemical heat transfer device comprising an electrochemical pump for pumping hydrogen to an enclosure comprising metal hydride.

13. The cooling system of claim 1 , wherein the impermeable exchange membrane comprises an ionomer.

14. The cooling system of claim 13 , wherein the impermeable exchange membrane has a Gurley value of more than 500 seconds.

15. The cooling system of claim 1 , wherein the impermeable exchange membrane has a thickness of no more than about 25 microns.

16. The cooling system of claim 15 , wherein the impermeable exchange membrane comprises a support layer.

17. The cooling system of claim 16 , wherein the support layer a fluoropolymer membrane support layer.

18. A cooling system comprising an ionic liquid dehumidification system comprising:
a) an ionic liquid desiccant composition comprising:
i) an ionic liquid desiccant:
ii) water;

b) a conditioner comprising:
i) a conditioner ionic liquid desiccant conduit having:
an ionic liquid desiccant inlet;
an ionic liquid desiccant outlet;

wherein the ionic liquid desiccant composition flows through the conditioner ionic liquid desiccant conduit;
ii) a conditioner fluid conduit having:
a conditioner fluid inlet;
a conditioner fluid outlet;

wherein a conditioner fluid flows through the conditioner fluid conduit; and
iii) an impermeable exchange membrane configured between the conditioner ionic liquid desiccant conduit and the conditioner fluid conduit;
wherein the conditioner fluid comprises moisture that is transferred through the conditioner impermeable exchange membrane to the ionic liquid desiccant flowing through the conditioner ionic liquid desiccant conduit;

c) a regenerator;
i) a regenerator ionic liquid desiccant conduit having:
an ionic liquid desiccant inlet:
an ionic liquid desiccant outlet;

wherein the ionic liquid desiccant composition flows through the regenerator ionic liquid desiccant conduit;
ii) a regenerator fluid conduit having:
regenerator fluid inlet;
a regenerator fluid outlet:

wherein the regenerator fluid flows through the regenerator fluid conduit;
ii) an impermeable exchange membrane configured between the regenerator ionic liquid desiccant conduit and the regenerator fluid conduit;

d) a metal hydride electrochemical heat transfer device that heats the ionic liquid desiccant so that ionic liquid desiccant is heated to a temperature greater than the temperature of ionic liquid desiccant in the conditioner;
wherein the ionic liquid desiccant flowing through the regenerator comprise moisture absorbed from the conditioner that is transferred through the regenerator impermeable exchange membrane to the regenerator fluid flowing through the regenerator fluid conduit;

e) a pump that pumps the ionic lid id desiccant composition in a loop from the conditioner to the regenerator:
wherein the ionic liquid desiccant composition has a lower moisture content at the conditioner fluid outlet than at the conditioner fluid inlet and wherein the ionic liquid desiccant composition has a lower temperature at the conditioner fluid outlet than at the conditioner fluid inlet;
wherein the impermeable exchange membrane has a thickness of no more than 25 microns comprises an ionomer and a support layer and has a Gurley value of more than 500 seconds.

19. The cooling system of claim 18 , wherein the metal hydride electrochemical heat transfer device comprising an electrochemical pump for pumping hydrogen to an enclosure comprising metal hydride.

Assignees

• Xergy Inc

Inventors

• Bahar Bamdad
• Parmelee William
• Abdelaziz Omar
• Ming Qu

Classifications

• B01D5/0087

  Recirculating of the cooling medium · CPC title

• B01D5/0027

  by direct contact between vapours or gases and the cooling medium · CPC title

• F24F3/1417 Primary

  with liquid hygroscopic desiccants · CPC title

• F24F3/001

  in which the air treatment in the central station takes place by means of a heat-pump or by means of a reversible cycle (reversible cycle for humidifying and drying air F24F3/147) · CPC title

• F25B17/02

  the absorbent or adsorbent being a liquid, e.g. brine (F25B17/10 takes precedence) · CPC title