Dual duct control system
First Claim
1. In an environment control system including a first duct for providing hot air and a second duct for providing cold air, a flow sensor circuit configured to determine combined flow of the hot air and the cold air and to provide a mixed flow signal representative of the combined flow, and a temperature sensor configured to measure temperature of the combined flow and to provide a temperature signal representative of the temperature, a dual duct control system, comprising:
- a controller configured to individually control a hot flow of the hot air provided by the first duct and to individually control a cold flow of the cold air provided by the second duct, the controller comprising;
a zone command circuit providing a zone command responsive to a zone temperature set point and a zone temperature value;
a mixed temperature error circuit coupled to the zone command circuit providing a mixed temperature error signal responsive to the zone command and the temperature signal;
a mixed flow error circuit coupled to the zone command circuit providing a mixed flow error signal responsive to the zone command and the mixed flow signal;
a cold flow setpoint circuit coupled to the mixed temperature error circuit and the mixed flow error circuit providing a cold flow setpoint for controlling the cold flow responsive to the mixed temperature error signal and the mixed flow error signal; and
a hot flow setpoint circuit circuit coupled to the mixed temperature error circuit and the mixed flow error circuit providing a hot flow setpoint for controlling the hot flow responsive to the mixed temperature error signal and the mixed flow error signal.
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Accused Products
Abstract
The present invention relates to a dual duct control system for use in an environmental control system. The dual duct control system is preferably utilized in a dual duct VAV box. The control system advantageously receives room temperature values, mixed air flow values, and positions the actuators in response to temperature values and flow values. The dual duct control system preferably executes a shower algorithm implemented in software to position the actuators. The shower algorithm provides a scheme for incrementally adjusting the hot and cold air flow setpoints for the VAV box so the internal environment reaches a comfortable temperature within a minimum amount of time.
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Citations
18 Claims
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1. In an environment control system including a first duct for providing hot air and a second duct for providing cold air, a flow sensor circuit configured to determine combined flow of the hot air and the cold air and to provide a mixed flow signal representative of the combined flow, and a temperature sensor configured to measure temperature of the combined flow and to provide a temperature signal representative of the temperature, a dual duct control system, comprising:
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a controller configured to individually control a hot flow of the hot air provided by the first duct and to individually control a cold flow of the cold air provided by the second duct, the controller comprising; a zone command circuit providing a zone command responsive to a zone temperature set point and a zone temperature value; a mixed temperature error circuit coupled to the zone command circuit providing a mixed temperature error signal responsive to the zone command and the temperature signal; a mixed flow error circuit coupled to the zone command circuit providing a mixed flow error signal responsive to the zone command and the mixed flow signal; a cold flow setpoint circuit coupled to the mixed temperature error circuit and the mixed flow error circuit providing a cold flow setpoint for controlling the cold flow responsive to the mixed temperature error signal and the mixed flow error signal; and a hot flow setpoint circuit circuit coupled to the mixed temperature error circuit and the mixed flow error circuit providing a hot flow setpoint for controlling the hot flow responsive to the mixed temperature error signal and the mixed flow error signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. In an environment control system including a first duct for providing a hot air flow and a second duct for providing a cold air flow, a flow sensor circuit configured to determine a combined flow of the hot air flow and the cold air flow and to provide a mixed flow signal representative of the combined flow, and a temperature sensor configured to measure a temperature of the combined flow and to provide a temperature signal representative of the temperature, a method of controlling an environmental zone comprising:
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providing a zone command responsive to a zone temperature set point and a zone temperature value; determining a mixed temperature error responsive to the zone command and the temperature signal; determining a mixed flow error responsive to the zone command and the mixed flow signal; adjusting the cold flow responsive to the mixed temperature error signal and the mixed flow error signal; and adjusting the hot flow responsive to the mixed temperature error signal and the mixed flow error signal. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification