IP Library › Granted Patent US 12,571,546
Granted Patent B2
US 12,571,546 · App. 17/719,598 · Granted Mar 10, 2026

Liquid desiccant air conditioning using air as heat transfer medium

Inventors: Aaron Meles (Grand Rapids, MI); Rachel Ellman (Palo Alto, CA); Chris Savarino (Rancho Cordova, CA)
Assignee: Mojave Energy Systems, Inc.
F24F3/1417F24F3/153F24F2003/1452F24F2003/1458
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Quick Facts
Patent No.
US 12,571,546
App. No.
17/719,598
Granted
Mar 10, 2026
Kind
B2
Abstract

A liquid desiccant system includes a liquid desiccant loop having an absorber unit in fluid communication with a desorber unit and liquid desiccant flowing between the absorber unit and the desorber unit. The liquid desiccant system includes a supply airflow path passing through the absorber unit and forming an absorber liquid/air interface within the absorber unit and a conditioned airflow exiting the absorber unit. The liquid desiccant system includes a regeneration airflow path passing through the desorber unit and forming a desorber liquid/air interface within the desorber unit and an exhaust airflow exiting the desorber unit. A heat exchanger is thermally coupled to the supply airflow path for removing heat from supply airflow upstream of the absorber unit. A heat exchanger is thermally coupled to the regeneration airflow path adding heat to regeneration airflow upstream of the desorber unit.

Claims (75)

1 . A liquid desiccant system comprising:

a liquid desiccant loop in fluid communication with an absorber unit and a desorber unit such that liquid desiccant is flowable between the absorber unit and the desorber unit;

a supply airflow path passing supply airflow at a supply temperature and an absolute humidity through the absorber unit and forming an absorber liquid/air interface within the absorber unit and a conditioned airflow path exiting the absorber unit;

a regeneration airflow path passing regeneration airflow at the supply temperature and the absolute humidity through the desorber unit and forming a desorber liquid/air interface within the desorber unit and an exhaust airflow path exiting the desorber unit; and

a heat exchanger thermally coupled to the supply airflow path and configured to remove heat from the supply airflow upstream of the absorber unit, the heat exchanger thermally coupled to the regeneration airflow path and configured to add heat to the regeneration airflow upstream of the desorber unit,

wherein the liquid desiccant loop between the absorber unit and the desorber unit is a closed loop that does not include a desiccant-to-liquid heat exchanger and does not include a desiccant-to-refrigerant heat exchanger.

2 . The liquid desiccant system of claim 1 , wherein at least 95% of total heat added to the liquid desiccant is added at the desorber liquid/air interface within the desorber unit.

3 . The liquid desiccant system of claim 1 , wherein the liquid desiccant has a first temperature exiting the absorber unit and a second temperature entering the desorber unit and the first temperature and second temperature are substantially equal.

4 . The liquid desiccant system of claim 1 , wherein the heat exchanger comprises an evaporator coil within the supply airflow path configured to remove heat from the supply airflow.

5 . The liquid desiccant system of claim 1 , wherein the heat exchanger comprises a condenser coil within the regeneration airflow path configured to add heat to the regeneration airflow.

6 . The liquid desiccant system of claim 1 , wherein the liquid desiccant loop between the absorber unit and the desorber unit only includes plumbing hardware, one or more pumps, and one or more filters.

7 . The liquid desiccant system of claim 1 , wherein the heat removed from the supply airflow is added to the regeneration airflow.

8 . The liquid desiccant system of claim 7 , wherein a portion of the heat removed from the supply airflow is dissipated in a condenser unit not along the regeneration airflow path.

9 . The liquid desiccant system of claim 7 , wherein a portion of the regeneration airflow is removed from the regeneration airflow path between the heat exchanger and the desorber unit.

10 . The liquid desiccant system of claim 1 , wherein the regeneration airflow into the desorber unit has a regeneration mass airflow rate value and liquid desiccant flowing through the desorber unit has a desorber liquid desiccant mass flow rate value, and the regeneration mass airflow rate value is in a range from 40 to 80 times the desorber liquid desiccant mass flow rate value.

11 . The liquid desiccant system of claim 10 , wherein the supply airflow into the absorber unit has a supply mass airflow rate value and liquid desiccant flowing through the absorber unit has an absorber liquid desiccant mass flow rate value, and the supply mass airflow rate value is in a range from 1 to 10 times the absorber liquid desiccant mass flow rate value.

12 . The liquid desiccant system of claim 10 , wherein liquid desiccant flows through the absorber unit at an absorber liquid desiccant mass flow rate value and liquid desiccant flows through the desorber unit at desorber liquid desiccant mass flow rate value, and the desorber liquid desiccant mass flow rate value is from 0.5% to 5% of the absorber liquid desiccant mass flow rate value and the desorber liquid desiccant mass flow rate value through the desorber unit is substantially equal to a liquid desiccant mass flow rate value from the absorber unit to the desorber unit.

13 . The liquid desiccant system of claim 10 , wherein liquid desiccant flows through the absorber unit at an absorber liquid desiccant mass flow rate value and liquid desiccant flows through the desorber unit at desorber liquid desiccant mass flow rate value, and the desorber liquid desiccant mass flow rate value is from 0.5% to 5% of the absorber liquid desiccant mass flow rate value and the desorber liquid desiccant mass flow rate value through the desorber unit is greater than a liquid desiccant mass flow rate value from the absorber unit to the desorber unit.

14 . The liquid desiccant system of claim 1 , wherein liquid desiccant comprises of LiCl, NaCl, LiBr, or CaCl 2 ).

15 . The liquid desiccant system of claim 1 , wherein liquid desiccant comprises LiCl.

16 . The liquid desiccant system of claim 1 , wherein a concentration value of liquid desiccant in the desorber unit is 3% or greater, by weight, than a concentration value of the liquid desiccant in the absorber unit.

17 . The liquid desiccant system of claim 1 , wherein a concentration value of liquid desiccant in the desorber unit is 5% or greater, by weight, than a concentration value of the liquid desiccant in the absorber unit.

18 . The liquid desiccant system of claim 1 , wherein, during operation, conditioned airflow and exhaust airflow are formed simultaneously.

19 . The liquid desiccant system of claim 1 , wherein the system is configured to minimize heat added to the liquid desiccant outside the desorber liquid/air interface within the desorber unit.

20 . A method of conditioning an airflow comprising:

circulating liquid desiccant through a liquid desiccant loop between an absorber unit and a desorber unit, without circulating the liquid desiccant through a desiccant-to-liquid heat exchanger and without circulating the liquid desiccant through a desiccant-to-refrigerant heat exchanger;

flowing supply air from an air source along a supply airflow path and through the absorber unit to form an absorber liquid/air interface within the absorber unit and a conditioned airflow exiting the absorber unit;

concurrent to flowing the supply air, flowing regeneration air from the air source along a regeneration airflow path and through the desorber unit to form a desorber liquid/air interface within the desorber unit and an exhaust airflow exiting the desorber unit;

removing heat from the supply air upstream of the absorber unit; and

adding heat to the regeneration air upstream of the desorber unit.

21 . The method of claim 20 , further comprising flowing the regeneration air through the desorber unit at a regeneration mass airflow rate value and flowing liquid desiccant through the desorber unit at a desorber liquid desiccant mass flow rate value, and the regeneration mass airflow rate value is in a range from 40 to 80 times the desorber liquid desiccant mass flow rate value.

22 . The method of claim 21 , further comprising flowing the supply air through the absorber unit at a supply mass airflow rate value and flowing liquid desiccant through the absorber unit at an absorber liquid desiccant mass flow rate value, and the supply mass airflow rate value is in a range from 1 to 10 times the absorber liquid desiccant mass flow rate value.

23 . The method of claim 21 , further comprising flowing liquid desiccant through the absorber unit at a first mass flow rate and flowing liquid desiccant from the absorber unit to the desorber unit at a second mass flow rate, and the second mass flow rate is from 0.5% to 5% of the first mass flow rate.

24 . The method of claim 20 , wherein removing heat comprises flowing the supply air through an evaporator coil within the supply airflow path, and adding the heat comprises flowing the regeneration air through a condenser coil within the regeneration airflow path.

25 . The method of claim 20 , wherein at least 95% of total heat added to the liquid desiccant is added at the desorber liquid/air interface within the desorber unit.

26 . The method of claim 20 , wherein at least 99% of total heat added to the liquid desiccant is added at the desorber liquid/air interface within the desorber unit.

27 . The method of claim 20 , wherein the circulating the liquid desiccant includes minimizing heat added to the liquid desiccant within the liquid desiccant loop outside the desorber liquid/air interface within the desorber unit.

28 . The method of claim 20 , wherein a concentration value of liquid desiccant in the desorber unit is 3% or greater, by weight, than a concentration value of the liquid desiccant in the absorber unit.

29 . A liquid desiccant system comprising:

a liquid desiccant loop in fluid communication with an absorber unit and a desorber unit such that liquid desiccant is flowable between the absorber unit and the desorber unit;

a supply airflow path passing through the absorber unit and forming an absorber liquid/air interface within the absorber unit and a conditioned airflow path exiting the absorber unit;

a regeneration airflow path passing through the desorber unit and forming a desorber liquid/air interface within the desorber unit and an exhaust airflow path exiting the desorber unit; and

a heat exchanger thermally coupled to the supply airflow path and to the regeneration airflow path, the heat exchanger configured to remove heat from supply airflow along the supply airflow path upstream of the absorber unit while adding heat to regeneration airflow along the regeneration airflow path upstream of the desorber unit,

wherein the system is configured to minimize heat added to the liquid desiccant outside the desorber liquid/air interface within the desorber unit, and

wherein the liquid desiccant loop between the absorber unit and the desorber unit is a closed loop that does not include a heat exchanger.

30 . The liquid desiccant system of claim 29 , wherein at least 99% of total heat added to the liquid desiccant is added at the desorber liquid/air interface within the desorber unit.

31 . The liquid desiccant system of claim 30 , wherein the liquid desiccant has a first temperature exiting the absorber unit and a second temperature entering the desorber unit and the first temperature and second temperature are substantially equal.

32 . The liquid desiccant system of claim 29 , wherein the heat exchanger comprises an evaporator coil within the supply airflow path configured to remove heat from the supply airflow, and the heat exchanger comprises a condenser coil within the regeneration airflow path configured to add heat to the regeneration airflow, and the heat removed from the supply airflow is added to the regeneration airflow.

33 . The liquid desiccant system of claim 32 , wherein a portion of the heat removed from the supply airflow is dissipated in a condenser unit not along the regeneration airflow path.

34 . The liquid desiccant system of claim 29 , wherein the regeneration airflow into the desorber unit has a regeneration mass airflow rate value and liquid desiccant flowing through the desorber unit has a desorber liquid desiccant mass flow rate value, and the regeneration mass airflow rate value is in a range from 40 to 80 times the desorber liquid desiccant mass flow rate value.

35 . The liquid desiccant system of claim 29 , wherein a concentration value of liquid desiccant in the desorber unit is 3% or greater, by weight, than a concentration value of the liquid desiccant in the absorber unit.

36 . The liquid desiccant system of claim 29 , wherein a concentration value of liquid desiccant in the desorber unit is 5% or greater, by weight, than a concentration value of the liquid desiccant in the absorber unit.

37 . The liquid desiccant system of claim 29 , wherein both the supply airflow and the regeneration airflow upstream the heat exchanger include unconditioned air.

38 . A method of conditioning an airflow comprising:

circulating liquid desiccant through a liquid desiccant loop between an absorber unit and a desorber unit;

flowing supply air along a supply airflow path and through the absorber unit to form an absorber liquid/air interface within the absorber unit and a conditioned airflow exiting the absorber unit;

flowing regeneration air along a regeneration airflow path and through the desorber unit to form a desorber liquid/air interface within the desorber unit and an exhaust airflow exiting the desorber unit;

removing heat from the supply air upstream of the absorber unit; and

while removing heat from the supply air stream, adding heat to the regeneration air upstream of the desorber unit;

wherein the liquid desiccant loop is devoid of (1) a liquid reservoir (2) a desiccant-to-liquid heat exchanger, and (3) a desiccant-to-refrigerant heat exchanger.

39 . The method of claim 38 , wherein at least 99% of total heat added to the liquid desiccant is added at the desorber liquid/air interface within the desorber unit.

40 . The method of claim 38 , wherein the liquid desiccant has a first temperature exiting the absorber unit and a second temperature entering the desorber unit and the first temperature and the second temperature are substantially equal.

41 . The method of claim 38 , wherein the heat removed from the supply air is added to the regeneration air.

42 . The method of claim 38 , wherein regeneration airflow into the desorber unit has a regeneration mass airflow rate value and liquid desiccant flowing through the desorber unit has a desorber liquid desiccant mass flow rate value, and the regeneration mass airflow rate value is in a range from 40 to 80 times the desorber liquid desiccant mass flow rate value.

43 . The method of claim 38 , wherein a concentration value of liquid desiccant in the desorber unit is 3% or greater, by weight, than a concentration value of the liquid desiccant in the absorber unit.

44 . The method of claim 38 , wherein a concentration value of liquid desiccant in the desorber unit is 5% or greater, by weight, than a concentration value of the liquid desiccant in the absorber unit.

45 . The method of claim 38 , wherein the circulating the liquid desiccant includes minimizing heat added to the liquid desiccant within the liquid desiccant loop outside the desorber liquid/air interface within the desorber unit.

46 . A liquid desiccant system comprising:

a liquid desiccant loop in fluid communication with an absorber unit and a desorber unit such that liquid desiccant is flowable between the absorber unit and the desorber unit;

a supply airflow path passing through the absorber unit and forming an absorber liquid/air interface within the absorber unit and a conditioned airflow path exiting the absorber unit;

a regeneration airflow path passing through the desorber unit and forming a desorber liquid/air interface within the desorber unit and an exhaust airflow path exiting the desorber unit; and

a heat exchanger thermally coupled to the supply airflow path and configured to remove heat from supply airflow along the supply airflow path upstream of the absorber unit, the heat exchanger thermally coupled to the regeneration airflow path and configured to add heat to regeneration airflow along the regeneration airflow path upstream of the desorber unit;

wherein at least 95% of total heat added to the liquid desiccant is added at the desorber liquid/air interface within the desorber unit; and

wherein a portion of the regeneration airflow is removed from the regeneration airflow path between the heat exchanger and the desorber unit.

47 . The liquid desiccant system of claim 46 , wherein at least 99% of total heat added to the liquid desiccant is added at the desorber liquid/air interface within the desorber unit.

Assignments (2)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Feb 15, 2023
From: PALO ALTO RESEARCH CENTER INCORPORATED
To: MOJAVE ENERGY SYSTEMS, INC.
Reel/Frame 062709/0366 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Apr 13, 2022
From: MELES, AARON; ELLMAN, RACHEL; SAVARINO, CHRIS
To: PALO ALTO RESEARCH CENTER INCORPORATED
Reel/Frame 059584/0319 →
Continuity (1)
Related Publication 20230332780A1 · Oct 19, 2023
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