Coordinated air-side control of HVAC system
First Claim
1. A method for linking control in an heating ventilation and air conditioning (HVAC) system, comprising:
- receiving a fan speed signal from a fan control loop;
choosing among an independent mode, a first linked mode, and a second linked mode, depending on the fan speed signal;
providing a signal to a pressure control loop to reduce a speed of a supply air fan of an air handling unit, when the first linked mode is chosen;
providing a signal to a temperature control loop to decrease a speed of a heat exchange wheel, to decrease a flow rate of a heat exchange fluid to an evaporator coil, or both, when the second linked mode is chosen; and
allowing the fan control loop to operate independently of the temperature and pressure control loops, when the independent mode is chosen.
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Accused Products
Abstract
A method and apparatus for controlling an HVAC system. The method may include receiving a fan speed signal from a fan control loop, and choosing among an independent mode, a first linked mode, and a second linked mode, depending on the fan speed signal. The method may also include providing a signal to a pressure control loop to reduce a speed of a supply air fan of an AHU, when the first linked mode is chosen. The method may further include providing a signal to a temperature control loop to decrease a speed of a heat exchange wheel, to decrease a flow rate of a heat exchange fluid to an evaporator coil, or both, when the second linked mode is chosen. The method may additionally include allowing the fan control loop to operate independently of the temperature and pressure control loops, when the independent mode is chosen.
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Citations
20 Claims
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1. A method for linking control in an heating ventilation and air conditioning (HVAC) system, comprising:
- receiving a fan speed signal from a fan control loop;
choosing among an independent mode, a first linked mode, and a second linked mode, depending on the fan speed signal; providing a signal to a pressure control loop to reduce a speed of a supply air fan of an air handling unit, when the first linked mode is chosen; providing a signal to a temperature control loop to decrease a speed of a heat exchange wheel, to decrease a flow rate of a heat exchange fluid to an evaporator coil, or both, when the second linked mode is chosen; and allowing the fan control loop to operate independently of the temperature and pressure control loops, when the independent mode is chosen. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
- receiving a fan speed signal from a fan control loop;
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17. An apparatus for controlling an heating ventilation and air conditioning (HVAC) system, comprising:
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one or more fan control loops each configured to control a speed of one or more chilled beam fans; a plant temperature control loop configured to control a speed of a supply air fan of an air handling unit; a plant pressure control loop configured to control at least one of a speed of a heat exchange wheel of the air handling unit and a position of a control valve configured to control a flow rate of a refrigerant between a heat pump of the air handling unit and an evaporator coil of the air handling unit; and a linking controller coupled to the one or more fan control loops, the plant temperature control loop, and the plant pressure control loop, the linking controller being configured to receive a signal from the one or more fan control loops indicative of the speed of the one or more chilled beam fans and to choose among an independent mode, a first linked mode, and a second linked mode based on the speed of the one or more chilled beam fans, wherein, in the independent mode, the linking controller allows the plant temperature control loop and the plant pressure control loop to operate independently from the one or more fan control loops, in the first linked mode, the linking controller overrides the plant pressure control loop and causes the speed of the supply air fan to reduce to substantially zero, and in the second linked mode, the linking controller overrides the plant temperature control loop and causes at least one of the speed of the heat exchange wheel to reduce to substantially zero and the control valve to close or allow for a minimum flow rate. - View Dependent Claims (18, 19, 20)
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Specification