Leaving air temperature control of heating 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 heating element which heats 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 greater 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 greater than the previously sensed temperature of the air; and
adjusting the position to be commanded of each damper using the calculated offset value.
1 Assignment
0 Petitions
Accused Products
Abstract
The temperature of the air leaving a heating coil is monitored for rising above a first threshold temperature value. An offset value is calculated for use in the positioning of each damper associated with a zone that is to be heated by air leaving the heating coil when the temperature of the air leaving the heating coil rises above the first threshold value. The offset value for each damper position is maintained until the temperature of the air leaving the heating coil drops below a second threshold temperature lower than the first threshold temperature. Any additional heating sources which also heat the air flowing over the heating coil are turned off immediately if the temperature of the air leaving the cooling coil rises above a third threshold value that is higher than the first threshold value.
79 Citations
16 Claims
-
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 heating element which heats 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 greater 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 greater 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)
-
-
12. A system for controlling the positioning of dampers within a variable air volume system having a heating element for heating the air being supplied to the dampers, said system comprising:
-
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 heating element and upstream of the dampers so as to measure the temperature of the air leaving the heating 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 greater than a previous temperature sensed by said sensor. - View Dependent Claims (13, 14, 15, 16)
-
Specification