Demand control ventilation with fan speed control
First Claim
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1. A Demand Control Ventilation (DCV) system for a building, comprising:
- a damper having a range of damper positions, the damper for controlling a flow of outside air into the building;
a multi-speed fan in fluid communication with the damper for drawing outside air through the damper and into the building;
a controller, the controller configured to control the position of the damper such that a desired flow of outside air is drawn through the damper and into the building, wherein the position of the damper is dependent on both the desired flow of outside air and the speed of the multi-speed fan; and
wherein the controller stores a damper position and a fan speed for each of two or more calibrated flows of outside air, the controller interpolates between at least one of the damper positions and the fan speeds for at least two of the calibrated flows to achieve the desired flow of outside air.
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Abstract
A method and system for operating a demand control ventilation system with a multi-speed fan is disclosed. The control system may modulate the fan speed of a multi-speed fan and/or the position of a ventilation damper in order to achieve desired ventilation levels for a building.
73 Citations
19 Claims
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1. A Demand Control Ventilation (DCV) system for a building, comprising:
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a damper having a range of damper positions, the damper for controlling a flow of outside air into the building; a multi-speed fan in fluid communication with the damper for drawing outside air through the damper and into the building; a controller, the controller configured to control the position of the damper such that a desired flow of outside air is drawn through the damper and into the building, wherein the position of the damper is dependent on both the desired flow of outside air and the speed of the multi-speed fan; and wherein the controller stores a damper position and a fan speed for each of two or more calibrated flows of outside air, the controller interpolates between at least one of the damper positions and the fan speeds for at least two of the calibrated flows to achieve the desired flow of outside air. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A Demand Control Ventilation (DCV) system for a building, comprising:
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a multi-speed fan in fluid communication with an air inlet for drawing outside air into the building; a controller, the controller configured to control the speed of the multi-speed fan such that a desired flow of outside air is drawn through the air inlet and into the building, wherein the speed of the fan is dependent on the desired flow of outside air; and wherein the controller stores a fan speed for each of two or more calibrated flows of outside air, and the controller interpolates between the fan speeds for at least two of the calibrated flows of outside air to achieve the desired flow of outside air. - View Dependent Claims (14, 15)
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16. A control unit for controlling a Demand Control Ventilation (DCV) system of a building, wherein the Demand Control Ventilation (DCV) system includes a damper with a range of damper positions for controlling a flow of outside air into the building, and a multi-speed fan in fluid communication with the damper for drawing outside air through the damper and into the building, the control unit comprising:
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a controller configured to control the position of the damper such that a desired flow of outside air is drawn through the damper and into the building, wherein the position of the damper is dependent on both the desired flow of outside air and the speed of the multi-speed fan; and a memory coupled to the controller for storing a damper position and a fan speed for each of two or more calibrated flows of outside air, the controller interpolates between at least one of the damper positions and the fan speeds for at least two of the calibrated flows to achieve the desired flow of outside air. - View Dependent Claims (17, 18, 19)
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Specification