Controlling air temperatures of HVAC units
First Claim
1. A method for controlling an environmental maintenance system having a plurality of environmental maintenance units and at least one Temperature Set Point Reset (TSPR) system, the method comprising:
- receiving, at a first TSPR system from a first environmental maintenance unit of the plurality of environmental maintenance units, a first measure of an operational parameter of the first environmental maintenance unit, wherein the first environmental maintenance unit is configured to;
compute a first temperature difference between an air temperature and a first temperature setpoint;
use the first temperature difference to determine an operational level for controlling of a particular actuator of the first environmental maintenance unit, wherein the operational level is an input command to change the operational parameter of the particular actuator, andsend the determined operational level for the operational parameter as the first measure for the operational parameter to the first TSPR system;
comparing, at the first TSPR system, the first measure of the operational parameter to a first operational setpoint of the first environmental maintenance unit to obtain a first operational difference;
determining, with a processor of the first TSPR system, a first adjustment of the first temperature setpoint of the first environmental maintenance unit based on the first operational difference; and
sending the first adjustment to the first environmental maintenance unit, thereby controlling the first environmental maintenance unit based on the first adjustment.
1 Assignment
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Accused Products
Abstract
Systems and methods of stabilizing HVAC systems with multiple HVAC units configured to control return air temperature or discharge air temperature are provided. HVAC units that are controlled by the return air temperature compare the return air temperature to a setpoint that determines whether the HVAC unit'"'"'s operation increases, decreases, or stays the same. By adjusting the setpoint of an HVAC unit based on certain criteria (e.g., a desired operational effort of an HVAC unit) the system can be stabilized. A temperature setpoint reset (TSPR) system can be included in each HVAC unit that resets the temperature setpoint (TSP) of the HVAC unit so that the HVAC unit operates within a desired operational effort (e.g. compressor speed or valve position). A master feedback loop and optimizer loop may be implemented to further control the behavior of the HVAC system.
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Citations
24 Claims
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1. A method for controlling an environmental maintenance system having a plurality of environmental maintenance units and at least one Temperature Set Point Reset (TSPR) system, the method comprising:
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receiving, at a first TSPR system from a first environmental maintenance unit of the plurality of environmental maintenance units, a first measure of an operational parameter of the first environmental maintenance unit, wherein the first environmental maintenance unit is configured to; compute a first temperature difference between an air temperature and a first temperature setpoint; use the first temperature difference to determine an operational level for controlling of a particular actuator of the first environmental maintenance unit, wherein the operational level is an input command to change the operational parameter of the particular actuator, and send the determined operational level for the operational parameter as the first measure for the operational parameter to the first TSPR system; comparing, at the first TSPR system, the first measure of the operational parameter to a first operational setpoint of the first environmental maintenance unit to obtain a first operational difference; determining, with a processor of the first TSPR system, a first adjustment of the first temperature setpoint of the first environmental maintenance unit based on the first operational difference; and sending the first adjustment to the first environmental maintenance unit, thereby controlling the first environmental maintenance unit based on the first adjustment. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A computer product comprising a non-transitory computer readable medium storing a plurality of instructions that when executed control a computer system to control an environmental maintenance system having a plurality of environmental maintenance units, the instructions comprising:
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receiving, at a first TSPR system from a first environmental maintenance unit of the plurality of environmental maintenance units, a first measure of an operational parameter of the first environmental maintenance unit of the plurality of environmental maintenance units, wherein the first environmental maintenance unit is configured to; compute a first temperature difference between an air temperature and a first temperature setpoint; use the first temperature difference to determine an operational level for controlling of a particular actuator of the first environmental maintenance unit, wherein the operational level is an input command to change the operational parameter of the particular actuator, and send the determined operational level for the operational parameter as the first measure for the operational parameter to the first TSPR system; comparing at the first TSPR system, the first measure to a first operational setpoint of the first environmental maintenance unit to obtain a first operational difference; determining, by the first TSPR system, a first adjustment of the first temperature setpoint of the first environmental maintenance unit based on the first operational difference; and sending, by the first TSPR system, the first adjustment to the first environmental maintenance unit, thereby controlling the first environmental maintenance unit based on the first adjustment.
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18. A Temperature Set Point Reset (TSPR) system for controlling an environmental maintenance system having a plurality of environmental maintenance units, the TSPR system comprising:
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a first input for receiving, from a first environmental maintenance unit of the plurality of environmental maintenance units, a first measure of an operational effort of the first environmental maintenance unit, wherein the first environmental maintenance unit is configured to; compute a first temperature difference between an air temperature and a first air temperature setpoint; use the first temperature difference to determine an operational level for controlling of a particular actuator of the first environmental maintenance unit, wherein the operational level is an input command to change the operational effort of the particular actuator, and send the determined operational level for the operational effort as the first measure being an operational level for the operational effort to the TSPR system; a second input for receiving an operational effort setpoint; control circuitry coupled with the first and second inputs, the control circuitry configured to calculate; a change value using a difference between the operational effort and the operational effort setpoint; and determine a temperature setpoint adjustment by adding the change value and a temperature value; and an output for sending a temperature setpoint adjustment to the first environmental maintenance unit, thereby controlling the first environmental maintenance unit based on the first adjustment. - View Dependent Claims (19, 20, 21, 22, 23, 24)
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Specification