Method and apparatus for determining critical pressure of variable air volume heating, ventilating, and air-conditioning systems

a technology of variable air volume and critical pressure, which is applied in the direction of ventilation systems, lighting and heating apparatuses, heating types, etc., can solve the problems of insufficient air, inefficient at part-load conditions, and inability to get enough air

Inactive Publication Date: 2006-06-01
FEDERSPIEL CLIFFORD CONRAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0015] Another object of the present invention is to provide a strategy for determining the critical supply duct pressure of variable-air-v

Problems solved by technology

A problem with this strategy is that it is inefficient at part-load conditions, when the supply flow rate is significantly lower than a design flow rate, which is the flow rate at which the syst

Method used

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  • Method and apparatus for determining critical pressure of variable air volume heating, ventilating, and air-conditioning systems
  • Method and apparatus for determining critical pressure of variable air volume heating, ventilating, and air-conditioning systems
  • Method and apparatus for determining critical pressure of variable air volume heating, ventilating, and air-conditioning systems

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Embodiment Construction

[0020]FIG. 1 shows the components of a variable-air-volume heating, ventilating, and air-conditioning system that are relevant to the critical pressure determination strategy. These components include a supply fan 11, a fan modulating device 12, a supply duct 13, two or more terminal ducts 14, two or more terminal units 15, two or more terminal unit controllers 16, a static pressure sensor 17, an airflow sensor 18, and a supply fan controller 19. The system also contains other components such as heat exchangers and filters not shown in FIG. 1, which are used for other functions such as heating, cooling, and cleaning air. Supply fan 11 could be a centrifugal fan or an axial fan. Fan modulating device 12 could be a variable-speed drive, variable inlet guide vanes, a throttling device such as a damper, or a device to adjust the pitch of the fan blades. Supply duct 13 is an elongate sheet metal structure with rectangular cross-section used to transport air. Each terminal duct 14 is also...

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Abstract

A strategy for determining the critical supply duct pressure in variable-air-volume heating, ventilating, and air-conditioning systems that compensates for duct leakage and variable loads, enabling its use during normal system operation. The strategy consists of a static pressure sensor, an airflow sensor, a supply fan, a fan modulating device, a controller coupled to the static pressure sensor and the airflow sensor, and a data processing algorithm for analyzing results from a function test using these components. The functional test involves changing the supply duct pressure setpoint, waiting for equilibrium, recording pressure, flow, and time, then changing the supply duct pressure setpoint to the next setting in the sequence.

Description

[0001]“This invention was made with State of California support under California Energy Commission Grant number 02-03. The Energy Commission has certain rights to this invention.”BACKGROUND [0002] 1. Field of the Invention [0003] The following invention relates to controls for variable-air-volume heating, ventilating, and air-conditioning (HVAC) systems, specifically to supply duct static pressure control. [0004] 2. Description of Prior Art [0005] Modern buildings typically have complex heating, ventilating, and air-conditioning systems to control indoor temperature, pressure, ventilation rate, and other variables in a way that makes efficient use of energy. One way to conserve energy in these systems is to use a so-called variable-air-volume design. Key components of a variable-air-volume system are a supply fan and terminal units. The supply fan is a prime mover that causes air to move. A terminal unit contains a throttling damper that regulates an amount of air supplied to a spac...

Claims

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Application Information

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IPC IPC(8): F24F7/00F24F11/00
CPCF24F11/0001F24F2011/0038F24F2011/0042F24F2110/30F24F2110/40
Inventor FEDERSPIEL, CLIFFORD CONRAD
Owner FEDERSPIEL CLIFFORD CONRAD
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