Variable air volume control system
First Claim
1. A process for controlling the pressure within a supply duct of a variable air volume system, said process comprising the steps ofdefining a setpoint for the static pressure in a supply duct upstream of one or more outlets formed in the supply duct which provide air to branch ducts associated therewith;
- computing an offset to the defined setpoint for the static pressure in the supply duct as a function of the positional status of dampers located in one or more of the branch ducts;
adjusting the defined setpoint for the static pressure in the supply duct by the computed offset so as to thereby generate a controlling static pressure setpoint;
sensing the static pressure in the supply duct at a point upstream of the outlets formed in the supply duct;
comparing the sensed static pressure in the supply duct to the controlling static pressure setpoint; and
adjusting the pressure in the supply duct depending on the comparison of the sensed static pressure to the controlling static pressure setpoint.
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Accused Products
Abstract
A system controls the pressure at which conditioned is to be provided to one or more zones to be heated or cooled by the conditioned air. The system actively computes a setpoint for the pressure with a location in a duct system upstream of where any of the conditioned air is to be provided to the zones. The setpoint is computed as a function of the positional statuses of dampers within the duct system that regulate the flow of the conditioned air to the respective zones. The actively computed setpoint is compared with a sensed pressure in the duct system in order to determine whether the pressure in the duct system needs to be changed.
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Citations
20 Claims
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1. A process for controlling the pressure within a supply duct of a variable air volume system, said process comprising the steps of
defining a setpoint for the static pressure in a supply duct upstream of one or more outlets formed in the supply duct which provide air to branch ducts associated therewith; -
computing an offset to the defined setpoint for the static pressure in the supply duct as a function of the positional status of dampers located in one or more of the branch ducts; adjusting the defined setpoint for the static pressure in the supply duct by the computed offset so as to thereby generate a controlling static pressure setpoint; sensing the static pressure in the supply duct at a point upstream of the outlets formed in the supply duct; comparing the sensed static pressure in the supply duct to the controlling static pressure setpoint; and adjusting the pressure in the supply duct depending on the comparison of the sensed static pressure to the controlling static pressure setpoint. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A process for controlling the pressure of conditioned air within a supply duct of a variable air volume system, said process comprising the steps of:
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repetitively sensing the static pressure of the conditioned air within the supply duct at a location upstream of a plurality of outlets in the supply duct which provide conditioned air to branch ducts wherein each branch duct has at least one damper associated therewith for regulating the flow of conditioned air to a zone to be heated or cooled; repetitively computing a setpoint for the sensed static pressure of the conditioned air within the supply duct as a function of the positional statuses of the dampers in the branch; and adjusting the static pressure in the supply duct to meeting the currently computed setpoint. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A control system for controlling the pressure of conditioned air within a supply duct of a variable air volume system, said control system comprising:
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a sensor for repetitively sensing the static pressure of the conditioned air within the supply duct at a location upstream of a plurality of outlets in said supply duct which provides the conditioned air to respective branch ducts wherein each branch duct has at least one damper associated therewith for regulating the flow of the conditioned air to a zone to be heated or cooled; and computer means operative to repetitively compute a setpoint for the sensed static pressure of the conditioned air within the supply duct as a function of the positional statuses of the dampers in the branch ducts whereby the sensed static pressure in the supply duct may be thereafter compared with the currently computed setpoint. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification