Leaving air temperature control of cooling system
First Claim
1. A process for controlling the positioning of dampers within a variable air volume system in response to a sensing of the temperature of the air being supplied to the dampers, said process comprising the steps of:
- sensing the current temperature of the air downstream of a cooling element which cools the air being supplied to the dampers;
comparing the sensed current temperature of the air to a first threshold temperature value;
comparing the sensed current temperature with a previously sensed temperature of the air when the sensed current temperature is less than the first threshold temperature value;
calculating an offset value that is to be used in adjusting the position of each damper when the sensed current temperature is less than the previously sensed temperature of the air; and
adjusting the position to be commanded of each damper using the calculated offset value.
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Accused Products
Abstract
The temperature of air leaving a cooling coil is monitored for dropping below various threshold values. The number of cooling stages which chill the refrigerant flowing through the cooling coil is first reduced when the temperature drops below a first threshold and continues to drop relative to a previously sensed temperature. Damper positions governing the amount of air flowing to zones to be cooled are thereafter adjusted when the temperature continues to drop relative to a previously sensed temperature. All adjusted positions are at least maintained relative to a calculated offset value until the temperature rises above a second threshold value greater than the first threshold value. All cooling stages are turned off if the sensed temperature drops below a third threshold value lower than the first threshold.
32 Citations
16 Claims
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1. A process for controlling the positioning of dampers within a variable air volume system in response to a sensing of the temperature of the air being supplied to the dampers, said process comprising the steps of:
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sensing the current temperature of the air downstream of a cooling element which cools the air being supplied to the dampers; comparing the sensed current temperature of the air to a first threshold temperature value; comparing the sensed current temperature with a previously sensed temperature of the air when the sensed current temperature is less than the first threshold temperature value; calculating an offset value that is to be used in adjusting the position of each damper when the sensed current temperature is less than the previously sensed temperature of the air; and adjusting the position to be commanded of each damper using the calculated offset value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A system for controlling the positioning of dampers within a variable air volume system having a cooling element for cooling the air being supplied to the dampers, said system comprising:
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a plurality of motors, each motor associated with a respective damper; drive circuitry associated with each motor for providing current to the drive motors so as to position the dampers; a sensor located downstream of the cooling element and upstream of the dampers so as to measure the temperature of the air leaving the cooling element; a processing unit connected through an interface to said sensor and furthermore being connected to said drive circuitry, said processor having a memory unit associated therewith;
said memory unit including a stored program executable by said processing unit, said stored program including an instruction for comparing a temperature sensed by said sensor with a first threshold temperature value, an instruction for comparing the sensed current temperature with a previously sensed temperature, an instruction for calculating an offset value that is to be used by said motor driver circuitry and said motors to adjust the position of each damper when the sensed temperature is less than a previous temperature sensed by said sensor. - View Dependent Claims (13, 14, 15, 16)
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Specification