IP Library › Granted Patent US 12,516,891
Granted Patent B2
US 12,516,891 · App. 18/138,469 · Granted Jan 6, 2026

Thermal energy storage device and system

Inventors: Carlos E. Romero (Bethlehem, PA); Sudhakar Neti (St. Augustine, FL); Clay Naito (Coopersburg, PA); Alparslan Oztekin (Center Valley, PA); Spencer Quiel (Coopersburg, PA); Muhannad Suleiman (Orefield, PA); Zheng Yao (Allentown, PA)
Assignee: Lehigh University
F28D20/02
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Quick Facts
Patent No.
US 12,516,891
App. No.
18/138,469
Granted
Jan 6, 2026
Kind
B2
Abstract

A thermal energy storage device may include a heat storage medium, one or more thermosyphons, a discharging plenum chamber, and a discharging plenum chamber. The one or more thermosyphons may include an evaporative section configured to charge the thermal energy storage device, a condensing section configured to discharge the thermal energy storage device, and a heat transfer section extending between the evaporative section and the condensing section and fluidically coupled to the evaporative section and the condensing section. At least a portion of the heat transfer section may be disposed in the solid heat storage medium. At least a portion of the evaporative section and the condensing section may be disposed outside the solid heat storage medium.

Claims (54)

1 . A thermal energy storage device, comprising:

a heat storage medium;

one or more thermosyphons extending through the heat storage medium, the one or more thermosyphons comprising a hollow body that defines pressure controlled envelope and containing an operating medium in the pressure controlled envelope defined by the hollow body, wherein the one or more thermosyphons comprises:

an evaporative section configured to charge the thermal energy storage device, wherein the evaporative section comprises a first heat transfer enhancer disposed on the first end section of the hollow body, the first heat transfer enhancer comprising at least one of fins, roughened surfaces, or coils;

a condensing section configured to discharge the thermal energy storage device, wherein the condensing section comprises a second heat transfer enhancer disposed on the second end section of the hollow body, the second heat transfer enhancer comprising at least one of fins, roughened surfaces, or coils;

a heat transfer section extending between the evaporative section and the condensing section, wherein the heat transfer section is fluidically coupled to the evaporative section and the condensing section, wherein at least a portion of the heat transfer section is disposed in the solid heat storage medium;

wherein at least a portion of the evaporative section and at least a portion of the condensing section are disposed outside the solid heat storage medium; and

a charging plenum chamber coupled to the evaporation section of the one or more thermosyphons; and

a discharging plenum chamber coupled to the condensing section of the one or more thermosyphons.

2 . The thermal energy storage device according to claim 1 , wherein a ratio of an outer diameter of hollow body to an inner diameter of the heat storage medium ranges from about 1:20 to about 1:60.

3 . The thermal energy storage device according to claim 1 , wherein the heat storage medium has a diameter ranging from about 1 m to about 1.5 m, and wherein the one or more of thermosyphon has a diameter ranging from about 25 mm to about 50 mm.

4 . The thermal energy storage device according to claim 1 , wherein the one or more thermosyphon comprises a plurality of thermosyphons, the plurality of thermosyphons being arranged concentrically about a central axis of the solid heat storage medium.

5 . The thermal energy storage device according to claim 1 , wherein one or more thermosyphon comprises a plurality of thermosyphons, the plurality of thermosyphons being in a packing arrangement.

6 . The thermal energy storage device according to claim 1 , further comprising:

insulation surrounding the solid heat storage medium;

wherein the insulation comprises at least one of mineral wool, aluminum foil, rock wool, fiber fax, vacuum, or a combination thereof.

7 . The thermal energy storage device according to claim 1 , wherein the evaporative section of the one or more thermosyphons is disposed in the charging plenum chamber and the condensing sections of the one or more of thermosyphons is disposed in the discharging plenum chamber.

8 . The thermal energy storage device according to claim 1 , wherein the solid heat storage medium comprises a concrete material.

9 . The thermal energy storage device according to claim 1 , wherein the heat storage medium is configured to have a thermal conductivity of about 2.8 W/m·K or more at a temperature of 20° C., and about 2.0 W/m·K or more at a temperature of 300 to 400° C.

10 . The thermal energy storage device according to claim 1 , wherein the heat storage medium is configured to have a heat capacity of about 2.0 MJ/m 3 ·K or more at a temperature of 20° C., and about 3.0 MJ/m 3 ·K or more at a temperature of 300 to 400° C.

11 . A thermal energy storage system, comprising:

a plurality of the thermal energy storage devices according to claim 1 ;

a charging channel fluidically coupled to the charging plenum chambers of the plurality of the thermal energy storage devices; and

a discharging channel fluidically coupled to the discharging plenum chambers of the plurality of the thermal energy storage devices.

12 . A method of employing a thermal energy storage device according to claim 1 , the method comprising:

charging the solid heat storage medium by flowing a first heat transfer medium at a first temperature through the charging plenum chamber and contacting the evaporative sections with the first heat transfer medium to transfer heat, via the operating medium undergoing a phase change, from the first heat transfer medium to the solid heat storage medium.

13 . A method of employing a thermal energy storage device, the method comprising:

charging a thermal energy storage device, the thermal energy storage device comprising:

a heat storage medium;

one or more thermosyphons extending through the heat storage medium, the one or more thermosyphons comprising a hollow body and containing an operating medium in the hollow body, wherein the one or more thermosyphons comprises:

an evaporative section configured to charge the thermal energy storage device;

a condensing section configured to discharge the thermal energy storage device;

a heat transfer section extending between the evaporative section and the condensing section, wherein the heat transfer section is fluidically coupled to the evaporative section and the condensing section, wherein at least a portion of the heat transfer section is disposed in the solid heat storage medium;

wherein at least a portion of the evaporative section and at least a portion of the condensing section are disposed outside the solid heat storage medium; and

a charging plenum chamber coupled to the evaporation section of the one or more thermosyphons; and

a discharging plenum chamber coupled to the condensing section of the one or more thermosyphons,

wherein charging the thermal energy storage device comprises charging the solid heat storage medium by flowing a first heat transfer medium at a first temperature through the charging plenum chamber and contacting the evaporative sections with the first heat transfer medium to transfer heat, via the operating medium undergoing a phase change, from the first heat transfer medium to the solid heat storage medium; and

discharging the solid head storage medium by flowing a second heat transfer medium at a second temperature through the discharging plenum chamber and contacting the condensing sections with the second heat transfer medium to transfer heat, via the operating medium undergoing a phase change, from the solid heat storage medium to the second heat transfer medium.

14 . The thermal energy storage device according to claim 1 , wherein the operating medium is selected from the group consisting of: water; a heat transfer oil; an alkali metal; aluminum bromide; a mixture of biphenyl and diphenyl oxide; a mixture of diaryl and tryaryl, diaryl alkyl; a mixture of diphenylethane and alkylated aromatics; an alkylated aromatic isomer; an alkyl benzenes; an alkylated aromatics; and a combination of two or more thereof.

15 . The thermal energy storage device according to claim 1 , wherein the operating medium occupies from about 10% to about 30% of an internal volume of the hollow body of the one or more thermosyphons when all of the operating medium is in a liquid phase.

16 . The thermosyphon of claim 1 wherein the thermosyphon is a dual action thermosyphon which allows dual operation to charge and discharge the thermal energy storage device.

17 . The thermal energy storage device according to claim 1 , wherein the thermal energy device is configured such that charging the thermal energy device comprises: transferring heat from a heat transfer medium flowing through the charging plenum to the evaporative section of the thermosyphon, and

transferring heat from the heat transfer section of the thermosyphon to the heat storage medium.

18 . A thermal energy storage device, comprising:

a heat storage medium;

one or more thermosyphons extending through the heat storage medium, the one or more thermosyphons comprising a hollow body and containing an operating medium in the hollow body, wherein the one or more thermosyphons comprises:

an evaporative section configured to charge the thermal energy storage device;

a condensing section configured to discharge the thermal energy storage device;

a heat transfer section extending between the evaporative section and the condensing section, wherein the heat transfer section is fluidically coupled to the evaporative section and the condensing section, wherein at least a portion of the heat transfer section is disposed in the solid heat storage medium;

wherein at least a portion of the evaporative section and at least a portion of the condensing section are disposed outside the solid heat storage medium; and

a charging plenum chamber coupled to the evaporation section of the one or more thermosyphons; and

a discharging plenum chamber coupled to the condensing section of the one or more thermosyphons,

wherein the thermal energy device is configured such that discharging the thermal energy device comprises: transferring heat from the heat storage medium to the heat transfer section of the thermosyphon, and

transferring heat from the condensing section of the thermosyphon to a second heat transfer medium flowing through the discharging plenum.

Assignments (2)
CONFIRMATORY LICENSE Recorded Jun 21, 2023
From: LEHIGH UNIVERSITY
To: UNITED STATES DEPARTMENT OF ENERGY
Reel/Frame 064049/0370 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Apr 24, 2023
From: ROMERO, CARLOS E.; NETI, SUDHAKAR; NAITO, CLAY; OZTEKIN, ALPARSLAN; QUIEL, SPENCER; SULEIMAN, MUHANNAD; YAO, ZHENG
To: LEHIGH UNIVERSITY
Reel/Frame 063420/0075 →
Continuity (3)
Provisional Application 63359296 · Jul 8, 2022
Provisional Application 63333636 · Apr 22, 2022
Related Publication 20230341192A1 · Oct 26, 2023
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