Systems and methods for providing airflow in furnace systems

Patent metadata

Field	Value
Publication number	US-10995968-B2
Application number	US-201816122721-A
Country	US
Kind code	B2
Filing date	Sep 5, 2018
Priority date	Aug 21, 2018
Publication date	May 4, 2021
Grant date	May 4, 2021

Abstract

A heating system, includes a furnace that is configured to heat air to be provided to a conditioned space, a pressure sensor configured to collect sensor data indicative of a pressure of air within the furnace; a fan configured to supply the heated air to the conditioned space, and a motor configured to drive the fan. Additionally, the heating system includes processing circuitry communicatively coupled to the pressure sensor and the motor. The processing circuitry is configured to control the motor based upon the sensor data such that an amount of airflow supplied to the conditioned space is constantly supplied by the fan.

First claim

The invention claimed is:

1. A heating system, comprising:
a furnace configured to heat air to be provided to a conditioned space;
a pressure sensor configured to collect sensor data indicative of a pressure of air within the furnace;
a fan configured to direct heated air to the conditioned space;
a motor configured to drive the fan; and
processing circuitry communicatively coupled to the pressure sensor and the motor, wherein the processing circuitry is configured to:
determine an expected pressure based on a first amount of airflow called for by a control device and based on data defining expected pressure values with respective corresponding amounts of airflow called for by the control device;
determine whether the pressure of air within the furnace is similar to the expected pressure; and
adjust an operating speed of the motor based on a determination that the pressure of air within the furnace is not similar to the expected pressure such that a second amount of airflow supplied to the conditioned space is constantly supplied by the fan.

2. The heating system of claim 1 , wherein the pressure sensor is disposed within a cabinet of the furnace and is configured to measure a pressure of air within the cabinet.

3. The heating system of claim 2 , wherein the motor is disposed within the cabinet.

4. The heating system of claim 3 , wherein the processing circuitry is disposed within the cabinet.

5. The heating system of claim 1 , wherein the motor is a constant torque brushless direct current (DC) motor.

6. The heating system of claim 1 , wherein the control device is a controller disposed within the conditioned space, and wherein the controller is communicatively coupled to the processing circuitry and configured to determine the first amount of airflow.

7. The heating system of claim 1 , wherein the sensor data comprises a first set of sensor data and a second set of sensor data, wherein the processing circuitry is configured to:
after receiving the first set of sensor data, cause the motor to operate at a first speed;
after causing the motor to operate at the first speed, receive the second set of sensor data; and
after receiving the second set of sensor data, cause the motor to operate at a second speed that is different from the first speed.

8. The heating system of claim 7 , wherein the processing circuitry is configured to cause the motor to operate at the first speed by:
determining settings of electric power to be supplied to the motor; and
sending a signal to cause the motor to operate with the settings of electric power.

9. The heating system of claim 8 , comprising a variable speed drive (VSD), wherein sending the signal to cause the motor to operate with the settings of electric power comprises sending the signal to the VSD, wherein the VSD is configured to cause the motor to operate with the settings of electric power based on the signal.

10. The heating system of claim 1 , wherein the sensor data is indicative of a pressure of air at a portion of the furnace that, relative to an airflow, is downstream of the fan and upstream of a heat exchanger of the furnace.

11. The heating system of claim 10 , wherein the processing circuitry is configured to determine a total external static pressure based on the sensor data.

12. The heating system of claim 10 , wherein the processing circuitry is configured to determine an additional pressure of air associated with a portion of the heating system that, relative to the airflow, is downstream of the heat exchanger.

13. The heating system of claim 1 , wherein the pressure sensor is the only sensor utilized to control the motor.

14. The heating system of claim 1 , wherein the data defining expected pressure values with respective corresponding amounts of airflow comprises a look-up table, an algorithm, or both defining a relationship between the expected pressure values for the respective corresponding amounts of airflow called for by the control device.

15. A control board for a furnace, comprising:
processing circuitry configured to be communicatively coupled to a pressure sensor and a motor that are each disposed within a blower compartment of the furnace, wherein the processing circuitry is communicatively coupled to a control device configured to be disposed within a conditioned space and configured to determine an amount of airflow, and the processing circuitry is configured to:
receive sensor data from the pressure sensor, wherein the sensor data is indicative of a pressure within the furnace;
determine an expected pressure based on the amount of airflow determined by the control device and based on data associating a plurality of expected pressure values with respective corresponding amounts of airflow determined by the control device;
determine whether the pressure within the furnace is similar to the expected pressure; and
control the motor such that a blower driven by the motor supplies a constant amount of air to the conditioned space and such that the pressure within the furnace is within a threshold amount of the expected pressure.

16. The control board of claim 15 , comprising a heat exchanger, wherein the blower is configured to motivate the air across the heat exchanger before supplying the air to the conditioned space.

17. The control board of claim 15 , wherein the control device is configured to determine the amount of airflow based on user input.

18. The control board of claim 15 , wherein the processing circuitry is configured to control the motor by executing an application, wherein the application comprises data indicative of electrical settings associated with the amount of airflow and the sensor data.

19. The control board of claim 18 , wherein the processing circuitry is configured to cause the motor to be supplied with electric power having the electrical settings.

20. The control board of claim 15 , wherein the processing circuitry is configured to alter a speed of the blower by causing a voltage of electric power supplied to the blower to be modified.

21. The control board of claim 15 , wherein the conditioned space comprises a residential building.

22. A non-transitory computer-readable medium comprising instructions that, when executed by a processor, are configured to cause the processor to:
receive sensor data indicative of a pressure of air within a cabinet of a furnace from a pressure sensor;
receive an amount of airflow called for by a control device;
determine an expected pressure based on the amount of airflow received from the control device and based on data associating expected pressure values with respective corresponding amounts of airflow called for by the control device;
determine electrical settings based on the expected pressure and the data; and
adjust an operating speed of a constant torque brushless direct current motor to be supplied with electric power having the electrical settings such that a fan driven by the motor supplies a constant amount of airflow to a conditioned space and such that the pressure of air within the cabinet is within a threshold amount of the expected pressure.

23. The non-transitory computer-readable medium of claim 22 , wherein the cabinet is configured to receive return air from ductwork of the conditioned space.

24. The non-transitory computer-readable medium of claim 23 , wherein the furnace comprises a heat exchanger, wherein the fan is configured to drive supply air across the heat

Assignees

• Johnson Controls Tech Co

Inventors

• Ray Elton D
• Hoyt Bennie D

Classifications

• F24H3/02 Primary

  with forced circulation · CPC title

• Y02B30/70

  Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating · CPC title

• F24F2140/10

  Pressure · CPC title

• F24F11/77 Primary

  by controlling the speed of ventilators · CPC title

• F24F3/044

  Systems in which all treatment is given in the central station, i.e. all-air systems · CPC title