VAV flow velocity calibration and balancing system

• US 7,653,459 B2
• Filed: 01/05/2007
• Issued: 01/26/2010
• Est. Priority Date: 06/29/2006
• Status: Active Grant

• Current Assignee: Honeywell International Inc.
• Original Assignee: Honeywell International Inc.
• Inventors: Pouchak, Michael A., Paul, Wacker
• Primary Examiner(s): DeCady; Albert
• Assistant Examiner(s): Rapp; Chad
• Application Number:
  US11/620,431
• Publication Number:
  US 20080004754A1
• Time in Patent Office: 1,117 Days
• Field of Search: 700/276, 700/279, 700/282, 700/301
• US Class Current: 700/276
• 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 11/38 Failure diagnosis
• CPC Class Codes: F24F 11/62 characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
• CPC Class Codes: F24F 2110/30 Velocity
• CPC Class Codes: F24F 3/0442 with volume control at a constant temperature
• CPC Class Codes: G05D 7/0635 by action on throttling means G05D7/0688, G05D7/0694 take precedence

Abstract

A variable velocity calibration and balancing system having a basis in a function block engine. It pertains to variable air volume systems and particularly to balancing systems as they relate to heating, ventilation and air conditioning (HVAC) systems. Balancing may be addressed using functional blocks to represent actual control and connections in an HVAC application for a variable air volume application.

Claims

1. An air flow balancing system comprising:

at least one pressure-based air flow sensor;

a conditioner connected to the air flow sensor;

an averaging and filter module connected to the conditioner;

a linearizer connected to the averaging and filter module;

a variable storage module connected to the linearizer;

an air flow balancing block implementation module connected to the variable storage module;

wherein inputs to the air flow balancing block implementation module comprise an air flow pressure, a duct area, a maximum flow speed, and/or a minimum flow speed; and

wherein a balancing block of the balancing block implementation module is of a function block engine.

2. The system of claim 1, wherein an output of the conditioner is a voltage indicative of a magnitude of pressure.

3. The system of claim 2, further comprising:

an analog-to-digital converter connected between the conditioner and the averaging and filter module; and

wherein the analog-to-digital converter is for converting voltage into counts indicative of the magnitude of pressure.

4. The system of claim 3, wherein the averaging and filter module is for providing filtered average counts.

5. The system of claim 3, wherein the linearizer is for providing linearized counts.

6. The system of claim 1, wherein a signal from the linearizer is to be converted and/or corrected to a flow signal in accordance with a multipoint curve using linear interpolation between points of the curve.

7. The system of claim 1, further comprising an operating system connected between the variable storage module and the balancing block implementation module.

8. The system of claim 1, wherein the variable storage module is adapted to a standard protocol for connection to a communication bus.