IP Library › Granted Patent US 12,526,954
Granted Patent B2
US 12,526,954 · App. 16/026,313 · Granted Jan 13, 2026

Liquid submerged, horizontal computer server rack and systems and method of cooling such a server rack

Inventors: Christiaan Scott Best (Austin, TX); Mark Garnett (Oklahama City, OK)
Assignee: GREEN REVOLUTION COOLING, INC.
H05K7/20236F28D15/00G06F1/20G06F1/206H05K7/20281H05K7/20327H05K7/20381H05K7/20763H05K7/20781H05K7/20836G06F2200/201H01L2924/0002Y10T29/4973
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Quick Facts
Patent No.
US 12,526,954
App. No.
16/026,313
Granted
Jan 13, 2026
Kind
B2
Abstract

An apparatus for cooling a plurality of rack-mountable servers containing heat generating electronic components in a server room including a dielectric liquid cooling apparatus located inside the tank and a secondary cooling apparatus comprising a remote heat exchanger and at least one pump. The volume of dielectric liquid coolant comprises at least one passage in the tank that is outside of the vertically oriented rack-mountable servers. When the at least one pump is operated to move the dielectric liquid coolant vertically across the heat producing components on the vertically oriented servers, a circuit is formed in which a first portion of dielectric liquid coolant is moved vertically upward across the heat producing components on the vertically oriented servers and then downward outside of the rack mountable servers in the at least one passage, while a second portion of the dielectric liquid coolant flows out of the tank.

Claims (43)

1 . An apparatus for cooling a plurality of servers that are rack mountable and contain heat generating electronic components, the apparatus comprising:

a tank defining an open interior volume adapted to receive a volume of dielectric coolant in liquid form such that the plurality of servers are commonly at least partially submerged in the volume of the dielectric coolant, wherein the open interior volume comprises at least one passage in the tank that is outside of the plurality of servers, wherein a circuit is formed in which a first portion of dielectric coolant is configured to move vertically upward across the plurality of servers and downward outside of the plurality of servers in the at least one passage, wherein one of the plurality of servers is configured to be removed through an open or openable top of the tank while at least one other of the plurality of servers is configured to remain operating and independently operable within the tank and remain at least partially submerged in the dielectric coolant as the dielectric coolant continues to flow vertically across the at least one other of the plurality of servers;

at least one mounting member positioned within the open interior volume and configured to hold the plurality of servers within the open interior volume in a horizontally stacked relationship with one another;

a liquid-to-liquid heat exchanger located inside the tank, wherein the liquid-to-liquid heat exchanger is configured to be coupled to a secondary cooling apparatus remotely located outside the tank; and

a pump configured to move the dielectric coolant vertically across the plurality of servers.

2 . The apparatus of claim 1 , wherein the heat exchanger comprises a first inlet that receives a second coolant and a first outlet discharges the second coolant and wherein the second coolant removes heat from the dielectric coolant in the heat exchanger.

3 . The apparatus of claim 1 , wherein the portion of the dielectric coolant moved vertically upward across the plurality of servers flows in parallel through at least two of the plurality of servers.

4 . The apparatus of claim 1 , further comprising:

a controller configured to maintain the dielectric coolant at an elevated temperature that is higher than about 32.2 C (90 degrees F.) and lower than a maximum permissible temperature of any heat generating electronic component in the plurality of servers.

5 . The apparatus of claim 4 , wherein the elevated temperature is a temperature in the range of 32.2 C (90 degrees F.) and 54.4 C (130 degrees F.).

6 . The apparatus of claim 4 , wherein the elevated temperature is a temperature in the range of 37.8 C (100 degrees F.) and 43.3 (110 degrees F.).

7 . The apparatus of claim 1 , wherein the at least one mounting member secures opposed sides of each of the plurality of servers to the tank.

8 . The apparatus of claim 1 , wherein the dielectric coolant is mineral oil or a synthetic mineral oil.

9 . The apparatus of claim 1 , wherein the at least one mounting member holds the plurality of servers in the tank while maintaining space within the dielectric coolant above and below the plurality of servers for promoting horizontal flow of the dielectric coolant within the tank.

10 . The apparatus of claim 1 , wherein the secondary cooling apparatus is located outside a room containing the tank.

11 . The apparatus of claim 1 , wherein the secondary cooling apparatus uses water as a cooling fluid.

12 . The apparatus of claim 1 , wherein the secondary cooling apparatus includes a cooling tower.

13 . The apparatus of claim 1 , wherein the dielectric coolant flows in open fluid communication between the plurality of servers.

14 . A method of cooling a plurality of servers that contain heat generating electronic components, comprising:

flowing a dielectric coolant in liquid form within an open interior volume of a tank through the plurality of servers that are rack mountable and held in a horizontally stacked relationship on at least one mounting member in the open interior volume such that the plurality of servers are commonly at least partially submerged in the volume of the dielectric coolant, wherein the open interior volume comprises at least one passage in the tank that is outside of the plurality of servers, wherein a circuit is formed in which a first portion of dielectric coolant is moved vertically upward across the plurality of servers and downward outside of the plurality of servers in the at least one passage, wherein one of the plurality of servers is configured to be removed through an open or openable top of the tank while at least one other of the plurality of servers is configured to remain operating and independently operable within the tank and remain at least partially submerged in the dielectric coolant as the dielectric coolant continues to flow vertically across the at least one other of the plurality of servers, wherein the dielectric coolant is moved vertically across the plurality of servers;

rejecting at least a portion of heat absorbed by the dielectric coolant from the plurality of servers by directing the dielectric coolant toward a liquid-to-liquid heat exchanger located inside the tank; and

rejecting at least a portion of the heat absorbed by the heat exchanger through a secondary cooling apparatus located remote from the tank and that is fluidly coupled to the heat exchanger.

15 . The method of claim 14 , further comprising:

removing one of the plurality of servers through the open or openable top of the tank while at least one other of the plurality of servers remains operating and independently operable within the tank and remains at least partially submerged in the dielectric coolant as the dielectric coolant continues to flow vertically across the at least one other of the plurality of servers.

16 . The method of claim 15 , further comprising:

monitoring a temperature of at least one of the plurality of servers; and

in response to periodic determination of the amount of energy needed to reject the heat absorbed by the dielectric coolant from the plurality of servers and a flow rate, periodically adjusting the flow rate of the dielectric coolant with a pump such that the dielectric coolant entering the plurality of servers is maintained at approximately the first elevated temperature in order to sufficiently cool the plurality of servers while reducing the amount of energy consumed to sufficiently cool each respective electronic device;

or adjusting the flow of a cooling fluid in a fluid circuit operably connected to the heat exchanger and the secondary cooling apparatus.

17 . The method of claim 16 , wherein the step of monitoring the temperature of the dielectric coolant comprises monitoring the temperature of the dielectric coolant at a plurality of locations.

18 . The method of claim 14 , further comprising:

beneficially using the heat recovered by the secondary cooling apparatus from the plurality of servers by recycling heat into a useful medium.

19 . The method of claim 14 , further comprising:

monitoring a temperature of the liquid dielectric coolant flowing through at least one location, wherein rejecting at least the portion of heat absorbed by the dielectric coolant from the plurality of servers includes maintaining the dielectric liquid coolant at a first elevated temperature as it enters or exits the plurality of servers, wherein the first elevated temperature is a temperature higher than about 32.2 C (90 degrees F.) and lower than a maximum permissible temperature of any heat generating electronic component in the plurality of servers.

20 . The method of claim 19 , wherein the first elevated temperature is a temperature below about 54.4 C (130 degrees F.).

21 . The method of claim 19 , wherein the first elevated temperature is a temperature below about 43.3 (110 degrees F.).

22 . An apparatus for cooling a plurality of servers that are rack mountable and contain heat generating electronic components, the apparatus comprising:

a tank defining an open interior volume adapted to receive a volume of dielectric coolant in liquid form and the plurality of servers are commonly at least partially submerged in the volume of the dielectric coolant, wherein the open interior volume comprises at least one passage in the tank that is outside of the plurality of servers, wherein a circuit is formed in which a first portion of dielectric coolant is configured to move vertically upward across the plurality of servers and downward outside of the plurality of servers in the at least one passage, wherein one of the plurality of servers is configured to be removed through an open or openable top of the tank while at least one other of the plurality of servers is configured to remain operating and independently operable within the tank and remain at least partially submerged in the dielectric coolant as the dielectric coolant continues to flow vertically across the at least one other of the plurality of servers;

at least one mounting member positioned within the open interior volume and configured to hold the plurality of servers within the open interior volume in a horizontally stacked relationship with one another; and

a liquid-to-liquid heat exchanger located inside the tank, wherein the dielectric coolant is moved vertically across the plurality of servers, wherein the liquid-to-liquid heat exchanger is configured to be coupled to a secondary cooling apparatus remotely located outside the tank.

23 . The apparatus of claim 22 , further comprising:

a controller configured to maintain the dielectric coolant at an elevated temperature that is higher than about 32.2 C (90 degrees F.) and lower than a maximum permissible temperature of any heat generating electronic component in the plurality of servers.

24 . The apparatus of claim 22 , wherein the at least one mounting member secures opposed sides of each of the plurality of servers to the tank.

25 . The apparatus of claim 22 , wherein the at least one mounting member holds the plurality of servers in the tank while maintaining space within the dielectric coolant above and below the plurality of servers for promoting horizontal flow of the dielectric coolant within the tank.

Assignments (7)
CORRECTIVE ASSIGNMENT TO CORRECT THE APPLICATION NUMBER INCORRECTLY LISTED AS 17253403 SHOULD BE LISTED AS 17523403 PREVIOUSLY RECORDED ON REEL 59594 FRAME 67. ASSIGNOR(S) HEREBY CONFIRMS THE CORRECTIVE ASSIGNMENT. Recorded Feb 13, 2025
From: GREEN REVOLUTION COOLING, INC.
To: GREEN REVOLUTION COOLING, INC.
Reel/Frame 070897/0290 →
SECURITY INTEREST Recorded Feb 19, 2024
From: GREEN REVOLUTION COOLING, INC.
To: CFIP2 GRC LLC
Reel/Frame 066491/0188 →
CORRECTED ADDRESS CHANGE TO CORRECT SPELLING OF THE COVEYING &RECEIVING PARTIES; &THE ERRONEOUSLY RECORDED APPLICATION NO. 29775264 WHICH WAS A TYPOGRAPHICAL ERROR RECORDED AT REEL/FRAME 059218/0576 Recorded Jul 5, 2022
From: GREEN REVOLUTION COOLING, INC.
To: GREEN REVOLUTION COOLING, INC.
Reel/Frame 061086/0814 →
CORRECTIVE ASSIGNMENT TO CORRECT THE ASSIGNOR AND ASSIGNEE NAMES PREVIOUSLY RECORDED AT REEL: 059218 FRAME: 0576. ASSIGNOR(S) HEREBY CONFIRMS THE CHANGE OF ADDRESS. Recorded Apr 4, 2022
From: GREEN REVOLUTION COOLING, INC.
To: GREEN REVOLUTION COOLING, INC.
Reel/Frame 059594/0067 →
ADDRESS CHANGE Recorded Feb 23, 2022
From: GREEN REVOLUTION COOLNG, INC.
To: GREEN REVOLUTION COOLNG, INC.
Reel/Frame 059218/0576 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jul 3, 2018
From: BEST, CHRISTIAAN SCOTT; GARNETT, MARK
To: GREEN REVOLUTION COOLING, INC.
Reel/Frame 046258/0842 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jul 3, 2018
From: BEST, CHRISTIAAN SCOTT; GARNETT, MARK
To: GREEN REVOLUTION COOLING, INC.
Reel/Frame 046261/0440 →
Continuity (5)
Continuation 13057881
Provisional Application 61165470 · Mar 31, 2009
Provisional Application 61163443 · Mar 25, 2009
Provisional Application 61188589 · Aug 11, 2008
Related Publication 20180317346A1 · Nov 1, 2018
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