Fan array fan section in air-handling systems

• US 7,922,442 B2
• Filed: 10/31/2007
• Issued: 04/12/2011
• Est. Priority Date: 03/20/2003
• Status: Expired due to Term

• Current Assignee: Nortek Air Solutions LLC (Melrose Industries Plc)
• Original Assignee: Huntair Incorporated (Melrose Industries Plc)
• Inventors: Hopkins, Lawrence G.
• Primary Examiner(s): Nguyen; Ninh H
• Application Number:
  US11/982,233
• Publication Number:
  US 20080187433A1
• Time in Patent Office: 1,259 Days
• Field of Search: 415/1, 415/60, 415/61, 415/108, 415/119, 415/177, 416/120, 417/3, 417/423.5, 417/426, 454/338
• US Class Current: 415/61
• CPC Class Codes: F04D 19/002 Axial flow fans
• CPC Class Codes: F04D 25/166 using fans
• CPC Class Codes: F04D 27/004 by varying driving speed
• CPC Class Codes: F04D 27/0261 by varying driving speed
• CPC Class Codes: F04D 29/522 especially adapted for elastic fluid pumps
• CPC Class Codes: F04D 29/644 especially adapted for elastic fluid pumps
• CPC Class Codes: F04D 29/664 by means of sound absorbing material
• CPC Class Codes: F05D 2270/023 of different spools or shafts
• CPC Class Codes: F05D 2270/03 in variable speed operation
• CPC Class Codes: F05D 2270/3061 of the working fluid
• CPC Class Codes: F24F 11/74 for controlling air flow rate or air velocity
• CPC Class Codes: F24F 11/77 by controlling the speed of ventilators
• CPC Class Codes: F24F 7/007 with forced flow using ducting systems F24F7/06
• CPC Class Codes: F24F 7/06 with forced air circulation, e.g. by fan positioning of a ventilator in or against a conduit
• CPC Class Codes: Y02B 30/70 Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Abstract

A fan array fan section in an air-handling system includes a plurality of fan units arranged in a fan array and positioned within an air-handling compartment. One preferred embodiment may include an array controller programmed to operate the plurality of fan units at peak efficiency. The plurality of fan units may be arranged in a true array configuration, a spaced pattern array configuration, a checker board array configuration, rows slightly offset array configuration, columns slightly offset array configuration, or a staggered array configuration.

Claims

1. A fan array fan section in an air-handling system to supply air to a building, comprising:

(a) an air-handling compartment;

(b) a fan array including at least three fan units, the fan array providing redundant air flow capacity;

(c) said fan array positioned within said air-handling compartment;

(d) said air-handling compartment associated with a building such that said air-handling system conditions the air of at least the portion of the building; and

(e) a control system for operating said at least three fan units substantially at or above a selected performance level at least by controlling a speed of ones of said at least three fan units that are ON.

2. The fan array of claim 1, wherein said control system comprises a programmable array controller.

3. The fan array of claim 1, wherein each fan unit has a preferred operating range, wherein said control system is configured to operate said at least three fan units substantially at or above the selected performance level when at least one fan unit is OFF by controlling the speed of remaining fan units within said preferred operating range while still meeting the selected performance level.

4. The fan array of claim 1, wherein the selected performance level is based on a criterion selected from the following group of criteria:

(a) air flow volume;

(b) air pressure; and

(c) pattern of air flow.

5. The fan array of claim 1, wherein the control system operates the fan units that are ON by changing a speed of the ON fan units to meet a current air demand of at least the portion of the building.

6. The fan array of claim 1, wherein the control system meets a current air demand of at least the portion of the building by at least one of i) taking fan units on-line, ii) taking fan units off-line, and iii) changing a speed of fan units that are ON.

7. The fan array of claim 1, wherein the control system is configured to automatically turn ON and turn OFF individual fan units.

8. The fan array of claim 1, wherein the control system is configured to permit a user to manually turn ON and turn OFF the individual fan units.

9. The fan array of claim 1, wherein the control system meets the specified air capacity of least the portion of the building, when at least one of the fan units is OFF or removed, by changing a speed of the fan units that are ON.

10. The fan array of claim 9, wherein the speed of the fan units is set one of automatically and manually.

11. The fan array of claim 1, wherein the specified air capacity corresponds to at least a portion of a total air handling requirement of the building.

12. The fan array of claim 1, further comprising sound attenuation layers positioned between at least a portion of adjacent fan units.

13. The fan array of claim 1, wherein the fan units are positioned adjacent to one another in a common plane, the sound attenuation layers being arranged in at least one of rows and columns.

14. The fan array of claim 1, wherein the sound attenuation layers are provided along at least one of a top, bottom, and side of the fan units.

15. The fan array of claim 1, wherein the sound attenuation layers each include a perforated facing and at least one layer of insulation material.

16. A fan array fan section in an air-handling system to supply air to a building, comprising:

an air handling compartment having a discharge plenum configured to deliver air to a ventilation system for at least a portion of the building;

a fan array of fan units positioned in the air handling compartment;

the fan units configured to be ON and OFF,

the fan array having redundant air flow capacity such that, when at least one of the fan units is removed or OFF, the fan units that are ON have sufficient air flow capacity to at least meet a specified air capacity for at least the portion of the building.

17. The fan array of claim 16, further comprising an array controller programmed to control a speed of said fan units to at least meet a current air demand of at least the portion of the building.

18. The fan array of claim 16, further comprising:

at least three fan units; and

a control system for controlling said at least three fan units to run substantially at or above a selected performance level, wherein the fan units have a preferred operating range, wherein said control system is configured to operate said at least three fan units substantially at or above the selected performance level when at least one fan unit is OFF by controlling a speed of the remaining fan units to run within said preferred operating range while still meeting the selected performance level.

19. The fan array of claim 18, wherein said control system comprises a programmable array controller.

20. The fan array of claim 19, wherein said array controller is programmed to operate said at least three fan units to produce a stable operating point and eliminate surge effects.

21. The fan array of claim 18, wherein the selected performance level is based on a criterion selected from the following group of criteria:

(a) air flow volume;

(b) air pressure; and

(c) pattern of air flow.

22. The fan array of claim 16, further comprising a control system operates the fan units by controlling a speed of the fan units.

23. The fan array of claim 16, wherein the specified air capacity corresponds to a total air handling requirement specified for at least the portion of the building.

24. The fan array of claim 16, wherein the fan array comprises a first group of fan units sufficient in number to at least meet the specified air capacity;

and at least one redundant fan unit in addition to the first group of fan units.

25. The fan array of claim 16, wherein the fan array includes at least six fan units.

26. The fan array of claim 16, further comprising sound attenuation layers positioned between at least a portion of adjacent fan units.

27. The fan array of claim 26, wherein the fan units are positioned adjacent to one another in a common plane, the sound attenuation layers being arranged in at least one of rows and columns.

28. The fan array of claim 26, wherein the sound attenuation layers are provided along at least one of a top, bottom, and side of the fan units.

29. The fan array of claim 26, wherein the sound attenuation layers each include a perforated facing and at least one layer of insulation material.

30. The fan array of claim 16, wherein the fan array is arranged in a 2-dimensional pattern.

31. The fan array of claim 16, further comprising a control system for controlling the fan units by at least one of i) taking fan units on-line, ii) taking fan units off-line, and iii) changing a speed of fan units that are on-line.

32. The fan array of claim 16, further comprising a control system that is configured to automatically turn ON and turn OFF individual fan units.

33. The fan array of claim 16, further comprising a control system that is configured to permit a user to manually turn ON and turn OFF the individual fan units.

34. The fan array of claim 16, further comprising a control system that is configured to be programmed with at least one of a desired air flow volume, air pressure, and a pattern of fan units to operate.

35. The fan array of claim 16, further comprising one or more air handling components located downstream of at least one of the fan array and the discharge plenum, the air handling components include at least one of a cooling coil, a heating coil, a filter, a humidifier and a damper.

36. The fan array of claim 16, wherein the fan units direct air into a common area of the discharge plenum where the air combines before exiting the discharge plenum.

37. The fan array of claim 16, wherein the fan array is configured to meet a current air demand by operating all of the fan units at a first fan speed and wherein the fan array is configured to meet the current air demand by operating a subset of the fan units at a second fan speed faster than the first fan speed.

38. A method for providing a fan array fan section in an air-handling system to supply air to a building, comprising:

providing an air handling compartment having a discharge plenum configured to deliver air to a ventilation system for at least a portion of the building;

providing a fan array of fan units configured to be ON and OFF, the fan array having redundant air flow capacity such that, when at least one of the fan units is removed or OFF, the fan units that are ON have sufficient air flow capacity to at least meet a specified air capacity for at least the portion of the building; and

operating the fan array to at least meet a current air demand of at least the portion of the building.

39. The method of claim 38, further comprising:

turning OFF at least one of the fan units to form an off-line fan unit set;

turning ON at least one of the fan units to form an on-line fan unit set; and

adjusting a speed of the on-line fan unit set to at least meet a current air demand which represents at least a portion of the specified air capacity.

40. The method of claim 38, further comprising automatically taking off-line and on-line individual fan units.

41. The method of claim 38, further comprising manually taking off-line and on-line individual fan units.

42. The method of claim 38, further comprising turning ON a group of fan units to meet the specified air capacity while keeping at least one redundant fan unit off-line.

43. The method of claim 42, further comprising turning OFF a disabled fan unit from the group of fan units and turning ON the at least one redundant fan in order to still at least meet a current air demand which represents at least a portion of the specified air capacity.

44. The method of claim 38, further comprising turning ON only a number of the fan units required to meet a current air demand which represents at least a portion of the specified air capacity.

45. The method of claim 38, further comprising turning OFF one or more individual fan units that i) need to be replaced, ii) are not working properly or iii) need maintenance.

46. The method of claim 38, further comprising positioning sound attenuation layers between at least a portion of adjacent fan units.

47. The method of claim 46, wherein the fan units are positioned adjacent to one another in a common plane, the sound attenuation layers being arranged in at least one of rows and columns.

48. The method of claim 46, wherein the sound attenuation layers are provided along at least one of a top, bottom, and side of the fan units.

49. The method of claim 46, wherein the sound attenuation layers each include a perforated facing and at least one layer of insulation material.

50. The fan array of claim 38, further comprising:

operating all of the fan units at a first fan speed to at least meet the specified air capacity.

51. The fan array of claim 50 further comprising:

operating a subset of less than all of the fan units at a second fan speed to at least meet the specified air capacity, wherein the second fan speed is higher than the first fan speed.

52. The fan array of claim 38, further comprising:

operating all of the fan units at a first fan speed to at least meet the current air demand.

53. The fan array of claim 52, further comprising:

operating a subset of less than all of the fan units at a second fan speed to at least meet the current air demand, wherein the second fan speed is higher than the first fan speed.

54. A method for supplying air to a building from an air handling system, the air handling system comprising an air handling compartment configured to deliver air to a ventilation system for at least a portion of the building, the air handling system further comprising a fan array of fan units positioned in the air handling compartment, the method comprising:

operating the fan array having redundant air flow capacity such that, when at least one of the fan units is removed or OFF, the fan units that are ON have sufficient air flow capacity to at least meet a specified air capacity for at least the portion of the building.

55. The method of claim 54, further comprising:

turning OFF at least one of the fan units to form an off-line fan unit set;

turning ON at least one of the fan units to form an on-line fan unit set; and

adjusting a speed of the on-line fan unit set to at least meet a current air demand which represents at least a portion of the specified air capacity.

56. The method of claim 54, further comprising automatically taking off-line and on-line individual fan units.

57. The method of claim 54, wherein the at least one of the fan units is removed or OFF by manually disabling at least one fan unit.

58. The method of claim 54, further comprising turning ON a group of fan units to meet the specified air capacity while keeping at least one redundant fan unit off-line.

59. The method of claim 54, further comprising turning OFF a disabled fan unit from the group of fan units and turning ON the at least one redundant fan in order to still at least meet a current air demand which represents at least a portion of the specified air capacity.

60. The method of claim 54, further comprising turning ON only a number of the fan units required to meet a current air demand which represents at least a portion of the specified air capacity.

61. The method of claim 54, further comprising turning OFF one or more individual fan units that i) need to be replaced, ii) are not working properly or iii) need maintenance.

62. The method of claim 54, further comprising positioning sound attenuation layers between at least a portion of adjacent fan units.

63. The method of claim 54, wherein the fan units are positioned adjacent to one another in a common plane, the sound attenuation layers being arranged in at least one of rows and columns.

64. The method of claim 54, wherein the sound attenuation layers are provided along at least one of a top, bottom, and side of the fan units.

65. The method of claim 54, wherein the sound attenuation layers each include a perforated facing and at least one layer of insulation material.

66. The fan array of claim 54, further comprising:

operating all of the fan units at a first fan speed to at least meet the specified air capacity.

67. The fan array of claim 66, further comprising:

operating a subset of less than all of the fan units at a second fan speed to meet the specified air capacity, where the second fan speed is higher than the first fan speed.

68. The fan array of claim 54, further comprising:

operating all of the fan units at a first fan speed to at least meet the current air demand.

69. The fan array of claim 68, further comprising:

operating a subset of less than all of the fan units at a second fan speed to at least meet the current air demand, wherein the second fan speed is higher than the first fan speed.