IP Library › Granted Patent US 12,222,782
Granted Patent B2
US 12,222,782 · App. 17/896,003 · Granted Feb 11, 2025

Data center air handling unit including uninterruptable cooling fan with weighted rotor and method of using the same

Inventor: Rob Roy (Las Vegas, NV)
Assignee: SWITCH, LTD.
G06F1/20H05K7/20172H05K7/20745
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Quick Facts
Patent No.
US 12,222,782
App. No.
17/896,003
Granted
Feb 11, 2025
Kind
B2
Abstract

Described herein is an air handling unit for use in an integrated data center that provides for efficient cooling, wherein the air handling unit includes one or more uninterruptable cooling fans each with a weighted rotor for providing uninterrupted cooling during a power outage until back-up generators come on-line, and a method of using the same. The uninterruptable cooling fan rotors are configured to store sufficient energy as rotational kinetic energy. Furthermore, the uninterruptable cooling fans may also be configured for generation of electricity to power a control system associated therewith during a power outage until back-up generators come on-line.

Claims (37)

1. A method of preventing damage to electrical equipment, the electrical equipment being cooled with cool air from an electrically powered air conditioning unit during normal operation using grid power, the method comprising the steps of:

rotating a fan to a predetermined RPM using an electric motor powered with electricity from the grid power to cause at least a predetermined airflow, the fan including a weighted rotor assembly that includes a fan body and a plurality of fan blades, wherein the weighted rotor assembly weighs at least fifty pounds to create stored angular kinetic energy;

directing the airflow to the electrical equipment;

upon removal of the grid power to the fan, continuing to direct continued airflow to the electrical equipment for at least an interim period using the stored angular kinetic energy within the fan; and

before expiration of the interim period, continuing to rotate the fan using the electric motor powered with electricity from a back-up generator to cause a predetermined further continued airflow to the electrical equipment;

determining beginning and minimum ending angular speeds of the rotor assembly, as well as total energy lost by the rotor assembly during the interim period therebetween;

calculating a minimum mass moment of inertia of the rotor assembly based on the beginning and minimum ending angular speeds of the rotor assembly, as well as the total energy lost,

wherein said interim period is between 10 and 25 seconds, and the minimum mass moment of inertia of the rotor assembly is at least 6,000 lbs-in 2 .

2. The method according to claim 1 wherein said weighted rotor assembly includes a flywheel.

3. The method according to claim 2 wherein the fan is a centrifugal fan.

4. The method according to claim 1 wherein said fan is an array of fans, each fan in the array being configured with the weighted rotor assembly.

5. The method according to claim 1 wherein the step of rotating the fan includes controlling the fan using a control system; and

further including the step of using the stored angular kinetic energy to generate electricity to power said control system in a reduced power mode for the interim period.

6. The method according to claim 1 wherein the electric motor used in the step of using the electric motor powered with electricity from the grid power is a variable frequency drive motor; and

further including the step of using the stored angular kinetic energy to generate electricity to power said variable frequency drive motor in a reduced power mode for the interim period.

7. The method according to claim 1 wherein the airflow is directed through a venting system to the electrical equipment.

8. The method according to claim 1 further comprising attaching a weight to an outer circumference of the rotor assembly.

9. The method according to claim 1 wherein the weighted rotor assembly further includes a disk attached to the fan body, and wherein the disk has a distribution wherein the disk is more heavily weighted at a circumference of the disk.

10. The method according to claim 1 , wherein weights is positioned in both the perimeter of the flywheel and the rotor blades of the fan.

11. A method preventing damage to electrical equipment, the electrical equipment being cooled with cool air from an electrically powered air conditioning unit during normal operation using grid power, the method comprising the steps of:

rotating a fan to a predetermined RPM using an electric motor powered with electricity from the grid power to cause at least a predetermined airflow, the fan including a weighted rotor assembly that includes a fan body and a plurality of fan blades, wherein the weighted rotor assembly is configured to create stored angular kinetic energy;

directing the airflow to the electrical equipment;

upon removal of the grid power to the fan, continuing to direct continued airflow to the electrical equipment for at least an interim period using the stored angular kinetic energy within the fan;

determining beginning and minimum ending angular speeds of the rotor assembly, as well as total energy lost by the rotor assembly during the interim period therebetween; and

calculating a minimum mass moment of inertia of the rotor assembly based on the beginning and minimum ending angular speeds of the rotor assembly, as well as the total energy lost;

wherein said interim period is between 10 and 25 seconds and a minimum mass moment of inertia of the rotor assembly is at least 6,000 lbs-in 2 .

12. The method according to claim 11 further comprising, before expiration of the interim period, continuing to rotate the fan using the electric motor powered with electricity from a back-up generator to cause a predetermined further continued airflow to the electrical equipment.

13. The method according to claim 12 wherein the weighted rotor assembly weighs at least fifty pounds.

14. The method according to claim 11 wherein said weighted rotor assembly includes a flywheel.

15. The method according to claim 14 wherein the fan is a centrifugal fan.

16. The method according to claim 11 wherein said fan is an array of fans, each fan in the array being configured with the weighted rotor assembly.

17. The method according to claim 11 wherein the step of rotating the fan includes controlling the fan using a control system; and

further including the step of using the stored angular kinetic energy to generate electricity to power said control system in a reduced power mode for the interim period.

18. The method according the claim 11 wherein the electric motor used in the step of using the electric motor powered with electricity from the grid power is a variable frequency drive motor; and

further including the step of using the stored angular kinetic energy to generate electricity to power said variable frequency drive motor in a reduced power mode for the interim period.

19. The method according to claim 11 , further comprising attaching a weight to an outer circumference of the rotor assembly.

20. The method according to claim 11 , wherein weights is positioned in both the perimeter of the flywheel and the rotor blades of the fan.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Oct 7, 2022
From: ROY, ROB
To: SWITCH, LTD.
Reel/Frame 061351/0838 →
Continuity (8)
Continuation 16588576 · Sep 30, 2019
Division 15818596 · Nov 20, 2017
Continuation 13591150 · Aug 21, 2012
Continuation In Part 12384102 · Mar 30, 2009
Continuation In Part 12138771 · Jun 13, 2008
Provisional Application 61040636 · Mar 28, 2008
Provisional Application 60944082 · Jun 14, 2007
Related Publication 20220413571A1 · Dec 29, 2022
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