IP Library › Granted Patent US 12,510,257
Granted Patent B2
US 12,510,257 · App. 18/315,867 · Granted Dec 30, 2025

Electrochemically regenerated liquid desiccant dehumidification system using a secondary heat pump

Inventors: Philip Farese (Palo Alto, CA); Brian Kienitz (Palo Alto, CA); Michael Benedict (Palo Alto, CA); Aaron Meles (Grand Rapids, MI); Eugene S. Beh (Portola Valley, CA); Benjamin A. Zhang (Palo Alto, CA); Francisco E. Torres (San Jose, CA)
Assignee: Mojave Energy Systems, Inc.
F24F3/1417F24F2003/144F24F2003/1458
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Quick Facts
Patent No.
US 12,510,257
App. No.
18/315,867
Filed
May 11, 2023
Granted
Dec 30, 2025
Kind
B2
Art Unit
1776
USPC
62/271
Abstract

A liquid desiccant regenerator configured to produce a first output stream with a higher concentration of a liquid desiccant than a first input stream. The regenerator also produces a second output stream with a lower concentration of the liquid desiccant than a second input stream. Regeneration of the liquid desiccant in the liquid desiccant regenerator decreases a temperature of the liquid desiccant regenerator. The system includes an air contactor coupled to the first output stream and exposing an input air stream to the first output stream. The first output stream absorbs water from the input air stream to form at least one diluted output desiccant stream. A heat pump of the system is thermally coupled to move the heat from the first output stream to the liquid desiccant regenerator. The heat moved to the liquid desiccant regenerator increases an efficiency of the liquid desiccant regenerator.

Claims (64)

1 . A system, comprising:

a liquid desiccant regenerator configured to produce:

a first output stream from a first input stream, the first output stream having a higher concentration of a liquid desiccant than the first input stream; and

a second output stream from a second input stream, the second output stream having a lower concentration of the liquid desiccant than the second input stream;

an evaporator configured to be coupled to and remove heat from an input air stream to produce a cooled input air stream;

an air contactor coupled to the first output stream and the cooled input air stream to expose the cooled input air stream to the first output stream such that the first output stream absorbs water from the cooled input air stream to form a diluted output desiccant stream and dehumidified output air stream, wherein the diluted output desiccant stream is circulated back into the liquid desiccant regenerator; and

a heat pump configured to be thermally coupled the first output stream to move heat from the first output stream to the liquid desiccant regenerator, the heat moved to the liquid desiccant regenerator increasing an efficiency of the liquid desiccant regenerator.

2 . The system of claim 1 , wherein the heat is moved from the first output stream before entering the air contactor or as the first output stream enters the air contactor, the movement of heat from the first output stream reducing a water vapor absorption temperature of the liquid desiccant in the air contactor.

3 . The system of claim 1 , wherein the heat moved from the first output stream is applied to a subset of components of the liquid desiccant regenerator to cause a temperature gradient inside the of the liquid desiccant regenerator.

4 . The system of claim 1 , wherein the heat moved from the first output stream is applied to a one or more fluid streams inside the liquid desiccant regenerator.

5 . The system of claim 1 , wherein the air contactor is a first air contactor and the input air stream is a first input air stream, the system further comprising a second air contactor operable to desorb moisture from the second output stream into a second air stream, the desorbing of the moisture lowering a temperature of the second air contactor, the heat pump further thermally coupled to move part of the heat from the first output stream to the second air contactor.

6 . The system of claim 1 , wherein the heat pump includes a vapor compression heat pump having a refrigerant loop between a condenser and the evaporator, the evaporator configured to cool at least one of the input air stream entering the air contactor or the dehumidified output air stream exiting the air contactor, the heat pump further including a first heat exchanger that thermally couples a hot side of the refrigerant loop to the liquid desiccant regenerator and a second heat exchanger that thermally couples a cold side of the refrigerant loop to the first output stream.

7 . The system of claim 6 , wherein each one of the second heat exchanger and the evaporator includes an expansion valve, and the expansion valves are disposed in parallel.

8 . The system of claim 6 , wherein each one of the second heat exchanger and the evaporator includes an expansion valve, and the expansion valves are disposed in series.

9 . The system of claim 1 , wherein the liquid desiccant regenerator includes two or more stages, each subsequent stage being configured to produce an output stream having a concentration of the liquid desiccant higher than a corresponding output of a previous stage, the first output stream corresponding to the output stream of the two or more stages having a highest concentration of the liquid desiccant.

10 . The system of claim 9 , wherein a subset of the two or more stages are heated by the heat pump and any of the two or more stages that are not in the subset are not directly heated by the heat pump.

11 . The system of claim 9 , wherein the liquid desiccant regenerator is driven by an electric potential that engenders faradaic reactions happening at two different electrodes and a redox material undergoing the faradaic reactions is circulated between the two different electrodes, and a resulting third liquid desiccant stream, having desorbed moisture and thus increased a desiccant concentration of the third liquid desiccant stream, is returned to the liquid desiccant regenerator.

12 . A system, comprising:

a liquid desiccant regenerator configured to produce:

a first output stream from a first input stream, the first output stream having a higher concentration of a liquid desiccant than the first input stream; and

a second output stream from a second input stream, the second output stream having a lower concentration of the liquid desiccant than the second input stream;

an air contactor coupled to the first output stream and exposing an input air stream to the first output stream, the first output stream absorbing water from the input air stream to form a diluted output desiccant stream and a dehumidified air stream, wherein the diluted output desiccant stream is circulated back into the liquid desiccant regenerator;

an evaporator configured to be coupled to and remove heat from the dehumidified air stream to produce a cooled dehumidified air stream; and

a heat pump configured to be thermally coupled to the first output stream to move the heat from the first output stream to the liquid desiccant regenerator, the heat moved to the liquid desiccant regenerator increasing an efficiency of the liquid desiccant regenerator.

13 . The system of claim 12 , wherein the heat is moved from the first output stream before entering the air contactor or as the first output stream enters the air contactor, the movement of heat from the first output stream reducing a water vapor absorption temperature of the liquid desiccant in the air contactor.

14 . The system of claim 12 , wherein the heat moved from the first output stream is applied to a subset of components of the liquid desiccant regenerator to cause a temperature gradient inside the of the liquid desiccant regenerator.

15 . The system of claim 12 , wherein the heat moved from the first output stream is applied to a one or more fluid streams inside the liquid desiccant regenerator.

16 . The system of claim 12 , wherein the heat pump comprises a vapor compression heat pump having a refrigerant loop between a condenser and an evaporator, the evaporator used to cool at least one of the input air stream entering the air contactor or a dehumidified output stream exiting the air contactor, the heat pump further comprising a first heat exchanger that thermally couples a hot side of the refrigerant loop to the liquid desiccant regenerator and a second heat exchanger that thermally couples a cold side of the refrigerant loop to the first output stream.

17 . The system of claim 12 , wherein the heat pump comprises a vapor compression heat pump generating a chilled solution and a heated solution, the chilled solution being used to cool at least one of the input air stream entering the air contactor and a dehumidified output stream exiting the air contactor, and the heated solution being thermally coupled to the liquid desiccant regenerator.

18 . The system of claim 17 , wherein at least part of the second output stream is combined with condensate at the evaporator resulting in a further diluted stream being output from the evaporator.

19 . The system of claim 12 , wherein the air contactor is a first air contactor and the input air stream is a first input air stream, the system further comprising a second air contactor operable to desorb moisture from a second liquid desiccant stream into a second air stream, the desorbing of the moisture lowering a temperature of the second air contactor, the heat pump being further thermally coupled to move part of the heat from the first output stream to the second air contactor.

20 . The system of claim 12 , wherein the liquid desiccant regenerator comprises two or more stages, each subsequent stage being configured to produce an output stream having a concentration of the liquid desiccant higher than a corresponding output of a previous stage, the first output stream corresponding to the output stream of the two or more stages having a highest concentration of the liquid desiccant.

21 . The system of claim 20 , wherein a subset of the two or more stages are heated by the heat pump and any of the two or more stages that are not in the subset are not directly heated by the heat pump.

22 . The system of claim 20 , wherein the liquid desiccant regenerator is driven by an electric potential that engenders faradaic reactions happening at two different electrodes and a redox material undergoing the faradaic reactions is circulated between the two different electrodes.

23 . A system, comprising:

a liquid desiccant regenerator configured to produce a series of output streams with each output stream from the series of output streams configured to possess a different concentration of liquid desiccant;

an evaporator configured to be coupled to and remove heat from a first input air stream to produce a first cooled input air stream;

a series of air contactors with each air contactor configured to be coupled to one or more of the series of output streams to form a diluted output desiccant stream and an input air stream to form a dehumidified output air stream, wherein:

each of the output streams is coupled to one and only one of the air contactors from the series of air contactors;

the diluted output desiccant stream is circulated back into the liquid desiccant regenerator;

a first air contactor from the series of air contactors is coupled to the first cooled input air stream, each subsequent air contactor is coupled to a dehumidified output airstream formed by an upstream air contactor; and

a final air contactor in the series of air contactors producing a dehumidified air stream.

24 . The system of claim 23 , where the series of air contactors and the series of output streams are ordered such that the first air contactor from the series of air contactors has a lowest concentration, and the final air contactor from the series of air contactors has a highest concentration, and the air contactors between the first air contactor and the final air contactor are arranged in increasing concentration.

25 . The system of claim 23 , further comprising a heat pump thermally coupled to move heat from the series of output streams to the liquid desiccant regenerator, the heat moved to the liquid desiccant regenerator increasing an efficiency of the liquid desiccant regenerator.

26 . The system of claim 25 , wherein:

the diluted output desiccant stream is a first diluted output desiccant stream;

the series of air contactors includes an air contactor operable to desorb moisture from the first diluted output desiccant stream into a second air stream, the desorbing of the moisture producing (1) a second diluted output desiccant stream having an increased desiccant concentration and (2) lowering a temperature of that air contactor;

the heat pump being further thermally coupled to move part of the heat from the series of output streams to that second air contactor;

and the second diluted output desiccant stream being returned to the liquid desiccant regenerator.

27 . The system of claim 25 , wherein the heat pump includes a vapor compression heat pump having a refrigerant loop between a condenser and an evaporator, the evaporator used to cool at least one of the input air stream entering the air contactor or a dehumidified output air stream exiting the air contactor, the heat pump further including a first heat exchanger that thermally couples a hot side of the refrigerant loop to the liquid desiccant regenerator and a series of second heat exchangers that thermally couple a cold side of the refrigerant loop to the series of output streams.

28 . The system of claim 27 , wherein each one of the second heat exchanger and the evaporator includes an expansion valve, and the expansion valves are disposed in parallel.

29 . The system of claim 27 , wherein each one of the second heat exchanger and the evaporator includes an expansion valve, and the expansion valves are disposed in series.

30 . The system of claim 23 , wherein the liquid desiccant regenerator includes two or more stages, each subsequent stage being configured to produce an output stream having a concentration of the liquid desiccant higher than a corresponding output of a previous stage, the first output stream corresponding to the output stream of the two or more stages having a highest concentration of the liquid desiccant.

31 . The system of claim 30 , wherein the liquid desiccant regenerator is driven by an electric potential that engenders faradaic reactions happening at two different electrodes and a redox material undergoing the faradaic reactions is circulated between the two different electrodes.

32 . The system of claim 23 , further comprising a second air contactor operable to desorb moisture from a second series of liquid desiccant streams into a second air stream, the desorbing of the moisture lowering a temperature of the second air contactor, a heat pump further thermally coupled to move part of the heat from the first output stream to the second air contactor, and a resulting third series of liquid desiccant streams, having desorbed moisture and thus increased the desiccant concentration of the resulting third series of liquid desiccant streams, are returned to the liquid desiccant regenerator.

33 . A system, comprising:

a liquid desiccant regenerator configured to produce:

a first output stream from a first input stream, the first output stream having a higher concentration of a liquid desiccant than the first input stream; and

a second output stream from a second input stream, the second output stream having a lower concentration of the liquid desiccant than the second input stream;

the liquid desiccant regenerator comprising two or more stages, each subsequent stage being configured to produce an output stream having a concentration of the liquid desiccant higher than a corresponding output of a previous stage, the first output stream corresponding to the output stream of the two or more stages having a highest concentration of the liquid desiccant;

an air contactor coupled to the first output stream and exposing an input air stream to the first output stream, the first output stream absorbing water from the input air stream to form a diluted output desiccant stream and a dehumidified air stream, wherein the diluted output desiccant stream is circulated back into the liquid desiccant regenerator;

an evaporator configured to be coupled to and remove heat from the dehumidified air stream to produce a cooled dehumidified air stream; and

a heat pump configured to be thermally coupled to the first output stream to move the heat from the first output stream to the liquid desiccant regenerator, the heat moved to the liquid desiccant regenerator increasing an efficiency of the liquid desiccant regenerator;

wherein a subset of the two or more stages are heated by the heat pump and any of the two or more stages that are not in the subset are not directly heated by the heat pump.

Assignments (4)
SECURITY INTEREST Recorded Sep 9, 2026
From: MOJAVE ENERGY SYSTEMS, INC.
To: CELTIC BANK CORPORATION
Reel/Frame 075957/0743 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jul 3, 2023
From: BENEDICT, MICHAEL; MELES, AARON; ZHANG, BENJAMIN A.; BEH, EUGENE; TORRES, FRANCISCO E.
To: PALO ALTO RESEARCH CENTER INCORPORATED
Reel/Frame 064140/0432 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jul 3, 2023
From: FARESE, PHILIP; KIENITZ, BRIAN
To: MOJAVE ENERGY SYSTEMS, INC.
Reel/Frame 064140/0455 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jul 3, 2023
From: PALO ALTO RESEARCH CENTER INCORPORATED
To: MOJAVE ENERGY SYSTEMS, INC.
Reel/Frame 064140/0462 →
Continuity (3)
Continuation PCTUS2022082272 · Dec 22, 2022
Continuation In Part 17559172 · Dec 22, 2021
Related Publication 20230280049A1 · Sep 7, 2023
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