Ventilation system

• US 9,228,753 B2
• Filed: 05/07/2012
• Issued: 01/05/2016
• Est. Priority Date: 05/12/2011
• Status: Active Grant

• Current Assignee: Daikin Industries Ltd
• Original Assignee: Daikin Industries Ltd
• Inventors: Sakai, Gakuto, Eguchi, Akihiro, Yabu, Tomohiro
• Primary Examiner(s): Tompkins, Alissa
• Assistant Examiner(s): Kandare, Anthony
• Application Number:
  US13/980,658
• Publication Number:
  US 20130303074A1
• Time in Patent Office: 1,338 Days
• Field of Search: 454/256, 454/232, 454/239, 454/251, 454/258, 454/284, 454/229, 454/370, 454/56, 236/49.3, 236/1.B, 236/47, 700/277, 700/276
• US Class Current: 1/1
• CPC Class Codes: F24F 11/0001 for ventilation F24F11/30 takes precedence
• CPC Class Codes: F24F 11/30 for purposes related to the operation of the system, e.g. for safety or monitoring
• CPC Class Codes: F24F 11/63 Electronic processing
• CPC Class Codes: F24F 11/77 by controlling the speed of ventilators
• CPC Class Codes: F24F 11/81 by controlling the air supply to heat-exchangers or bypass channels
• CPC Class Codes: F24F 11/84 using valves
• CPC Class Codes: F24F 11/86 by controlling compressors within refrigeration or heat pump circuits
• CPC Class Codes: F24F 2110/10 Temperature
• CPC Class Codes: F24F 2110/12 of the outside air
• CPC Class Codes: F24F 2110/20 Humidity
• CPC Class Codes: F24F 2110/22 of the outside air
• CPC Class Codes: F24F 2140/00 Control inputs relating to system states
• CPC Class Codes: F24F 2140/60 Energy consumption
• CPC Class Codes: F24F 3/1417 with liquid hygroscopic desiccants
• CPC Class Codes: F24F 3/147 with both heat and humidity transfer between supplied and exhausted air
• 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: F25B 13/00 Compression machines, plants or systems, with reversible cycle defrosting cycles F25B47/02
• CPC Class Codes: F25B 2313/02741 using one four-way valve
• CPC Class Codes: F25B 2313/0293 related to the indoor fan, e.g. controlling speed
• CPC Class Codes: F25B 2313/0294 related to the outdoor fan, e.g. controlling speed
• CPC Class Codes: F25B 2600/0253 : with variable speed
• CPC Class Codes: F25B 2700/1931 : Discharge pressures
• CPC Class Codes: F25B 2700/1933 : Suction pressures
• CPC Class Codes: F25B 2700/21151 : at the suction side of the compressor
• CPC Class Codes: F25B 2700/21152 : at the discharge side of the compressor
• CPC Class Codes: F25B 41/34 : with the valve member being actuated by electric means, e.g. by piezoelectric actuators
• CPC Class Codes: Y02B 30/70 : Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Abstract

A ventilation system includes a connection determinator configured to determine that N-th, second, and sixth humidity controlling ventilation devices are connected to an identical second duct bank in a situation where when fans of the second and sixth humidity controlling ventilation devices are driven, and the rotational speed of a fan of the N-th humidity controlling ventilation device is changed, a power detector detects fluctuations in the power consumed by the fan of each of the second and sixth humidity controlling ventilation devices.

Claims

1. A ventilation system comprising:

a plurality of ventilation devices comprising first through x-th ventilation devices, where x is greater than 1, each of the plurality of ventilation devices including an air blowing fan;

a plurality of ducts to which the ventilation devices are connected;

a fan controller configured to control a rotational speed of a respective air blowing fan of each of the plurality of ventilation devices;

a power detector configured to detect a fluctuation in power consumed by the air blowing fan of each of the plurality of ventilation devices; and

a connection determiner configured to perform an iterative process of grouping the plurality of ventilation devices based on the plurality of ducts to which the plurality of ventilation devices are respectively connected, with one of the plurality of ventilation devices being designated a determination ventilation device and another one of the plurality of ventilation devices being designated a specific ventilation device during each iteration of the process, and a counter being initialized as N=I, the process including;

(1) designating the (N+1)-th ventilation device as the determination ventilation device,

(2) successively designating each of the first through N-th ventilation devices as the specific ventilation device and, while each of the first through N-th ventilation devices is designated as the specific ventilation device, determining whether the determination ventilation device is also connected to a same one of the plurality of ducts as the specific ventilation device on the basis of whether the power detector detects a fluctuation in the power consumed by the corresponding air blowing fan of the specific ventilation device in response to the fan controller changing the rotational speed of the corresponding air blowing fan of the determination ventilation device while the corresponding air blowing fan of the specific ventilation device is being driven by the fan controller, and

(3) if N+1 is less than X, incrementing the counter N by one, and returning to (1), wherein;

in (2), while each of the first through N-th ventilation devices is designated as the specific ventilation device, the determination ventilation device is determined to be connected to the same duct as the specific ventilation device if the power detector detects the fluctuation in the power consumed by the corresponding air blowing fan of the specific ventilation device in response to the changing of rotational speed of the corresponding air blowing fan of the determination ventilation device, and the determination ventilation device is determined to be connected to a different duct than the specific duct if the corresponding power detector does not detect the fluctuation in the power consumed by the corresponding air blowing fan of the specific ventilation device in response to the changing of rotational speed of the corresponding air blowing fan of the determination ventilation device,

on the basis of the process, the connection determiner determines which and how many of the plurality of ventilation devices are connected to each of the plurality of ducts, and

for each of the plurality of ventilation devices connected to a specific one of the plurality of ducts, the fan controller controls the rotational speed of the corresponding air blowing fan, based on the determined number of the plurality of ventilation devices connected to the specific one of the plurality of ducts to maintain a desired flow rate for the specific one of the plurality of ducts.

2. The ventilation system of claim 1, wherein

in (2), while each of the first through N-th ventilation devices is designated as the specific ventilation device, the determination ventilation device and the specific ventilation device are determined to be connected to the same duct in a situation where when the rotational speed of the corresponding air blowing fan of the determination ventilation device is increased, the power consumed by the corresponding air blowing fan of the specific ventilation device decreases.

3. The ventilation system of claim 1, wherein

in (2), while each of the first through N-th ventilation devices is designated as the specific ventilation device, the determination ventilation device and the specific ventilation device are determined to be connected to the same duct in a situation where when the rotational speed of the corresponding air blowing fan of the determination ventilation device is decreased, the power consumed by the corresponding air blowing fan of the specific ventilation device increases.