OPTIMIZATION OF BUILDING VENTILATION BY SYSTEM AND ZONE LEVEL ACTION
First Claim
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1. A method of selecting a ventilation control strategy from among a plurality of ventilation control strategies, the method comprising the steps of:
- determining if a CO2 signal is present and valid;
selecting a CO2 based ventilation control strategy if the CO2 signal is present and valid;
selecting a second ventilation control strategy if the CO2 signal is not present or is invalid; and
operating using the selected strategy;
wherein the selection occurs in a zone controller.
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Abstract
A method of selecting a ventilation control strategy from among a plurality of ventilation control strategies. The method comprises the steps of: determining if a CO2 signal is present and valid; selecting a CO2 based ventilation control strategy if the CO2 signal is present and valid; selecting a second ventilation control strategy if the CO2 signal is not present or is invalid; and operating using the selected strategy. The selection step occurs in a zone controller.
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Citations
39 Claims
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1. A method of selecting a ventilation control strategy from among a plurality of ventilation control strategies, the method comprising the steps of:
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determining if a CO2 signal is present and valid;
selecting a CO2 based ventilation control strategy if the CO2 signal is present and valid;
selecting a second ventilation control strategy if the CO2 signal is not present or is invalid; and
operating using the selected strategy;
wherein the selection occurs in a zone controller. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of coordinating operation in a building control system including a coordinating controller, a plurality of coordinated controllers, and a communications network operably connecting the coordinating controller to the plurality of coordinated controllers, the method comprising the steps of:
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maintaining database and system information in the coordinating controller;
completing system control strategy calculations in the coordinating controller;
disseminating information relative to system control strategies from the coordinating controller to the plurality of coordinated controllers; and
determining in at least one of the plurality of coordinated controllers which of a selected group of control strategies to be implemented in that coordinated controller. - View Dependent Claims (8, 9)
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10. A method of coordinating the operation of a building control system having a coordinating controller and a plurality of coordinated controllers, the method comprising the steps of:
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determining at least one system wide control strategy in the coordinating controller;
forwarding requirements of the system wide control strategy to one or more of a plurality of coordinated controllers;
implementing one or more forwarded elements of the system wide control strategy in at least one of the plurality of coordinating controllers; and
overriding, in at least one of the plurality of coordinated controllers, at least one forwarded element of the system wide control strategy. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A method of coordinating the operation of a building control system including a coordinating controller and a plurality of coordinated controllers, the method comprising the steps of:
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providing a plurality of coordinated controllers;
providing a coordinating controller operably connected to and communicating with the plurality of coordinated controllers;
determining a system wide control strategy in the coordinating controller;
communicating elements of the system wide control strategy to the plurality of coordinated controllers;
determining local requirements in at least one of the plurality of coordinated controllers; and
overriding the normal control routines of the coordinating controller if said at least one of the plurality of coordinated controllers determines that local requirements will not be met by the system wide strategy. - View Dependent Claims (17, 18, 19, 20, 21)
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22. A method of calculating an outside air requirement for a zone, the method comprising the steps of:
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determining that ventilation is on for the particular zone;
verifying that a CO2 signal is present and valid for the particular zone;
controlling the airflow to the zone based on the CO2 signal if the signal is present and valid; and
controlling the airflow to the zone based on another criteria if the CO2 signal is not present or is invalid. - View Dependent Claims (23, 24, 25, 26, 27, 28)
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29. A method of meeting fresh air temperature requirements in a zone, the method comprising the steps of:
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determining a zone temperature setpoint and absolute limit requirements;
determining a zone fresh air requirement;
determining the percentage of fresh air in a supply airstream;
determining if the percentage of fresh air in the supply airstream is enough to meet the zone fresh air requirement; and
increasing the amount of supply airstream flow admitted to the zone if the percentage of fresh air in the supply airstream is insufficient to meet the zone'"'"'s fresh air requirement. - View Dependent Claims (30)
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31. A method of configuring a zone controller comprising the steps of:
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determining if a valid CO2 measurement is available representative of CO2 in a zone being controlled by the zone controller;
operating using a CO2 based ventilation control strategy if the CO2 signal is available; and
operating using a non-CO2 based ventilation control strategy if the CO2 signal is not available. - View Dependent Claims (32, 33, 34, 35, 36, 37)
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38. A method of providing fresh air to a zone, the method comprising the steps of:
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determining a local setpoint relative to a zone controller;
receiving, in the zone controller, a dynamic setpoint from a coordinating controller;
selecting, in the zone controller, either the dynamic setpoint or the local setpoint; and
controlling the fresh air provided to the zone in accordance with the selected setpoint. - View Dependent Claims (39)
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Specification