Ultraviolet (UV) light-based refrigerant leak detection system and method

Patent metadata

Field	Value
Publication number	US-11920806-B2
Application number	US-202217582910-A
Country	US
Kind code	B2
Filing date	Jan 24, 2022
Priority date	Dec 1, 2017
Publication date	Mar 5, 2024
Grant date	Mar 5, 2024

Abstract

A leak detection system of a heating, ventilating, and air conditioning (HVAC) system includes a sensor configured to detect a UV tracer in a monitored gas volume of the HVAC system. The leak detection system also includes a controller communicatively coupled to the sensor. The controller is configured to modify operation of the HVAC system in response to the sensor detecting the UV tracer in the monitored gas volume.

First claim

The invention claimed is:

1. A leak detection system of a heating, ventilating, and air conditioning (HVAC) system, comprising:
a sensor comprising a detector and a processor disposed within a body of the sensor, wherein the sensor is configured to:
measure a concentration of an ultraviolet (UV) tracer in a monitored gas volume of the HVAC system;
determine a concentration of leaked refrigerant in the monitored gas volume based on the concentration of the UV tracer measured to be in the monitored gas volume;
define a corrective action output based on the concentration of the leaked refrigerant determined to be in the monitored gas volume exceeding a threshold; and
output the corrective action output to modify operation of the HVAC system.

2. The system of claim 1 , wherein the processor is configured to receive a ratio of UV tracer to refrigerant from a database or a user input.

3. The system of claim 2 , wherein the processor is configured to determine the concentration of leaked refrigerant based on the concentration of UV tracer measured to be in the monitored gas volume and the ratio of UV tracer to refrigerant.

4. The system of claim 1 , wherein the detector comprises a photovoltaic device that is configured to detect modified light from the monitored gas volume.

5. The system of claim 1 , wherein the detector comprises a camera configured to detect modified light from the monitored gas volume.

6. The system of claim 1 , wherein the processor is configured to output the corrective action to a computing device of a user associated with the HVAC system.

7. The system of claim 1 , wherein the corrective action output comprises an indication of the concentration of the leaked refrigerant.

8. A method of operating a sensor to detect a refrigerant in a monitored gas volume of a heating, ventilation, and air conditioning (HVAC) system, the method comprising:
collecting a sample from the monitored gas volume of the HVAC system;
measuring a concentration of an ultraviolet (UV) tracer in the sample;
determining a concentration of leaked refrigerant in the monitored gas volume based on the concentration of the UV tracer measured to be in the sample;
defining a correcting action output based on the concentration of the leaked refrigerant determined to be in the monitored gas volume exceeding a threshold; and
outputting the corrective action output to modify operation of the HVAC system.

9. The method of claim 8 , comprising retrieving a predefined ratio of the UV tracer to refrigerant and wherein determining the concentration of the leaked refrigerant comprises determining the concentration of leaked refrigerant based on the predefined ratio.

10. The method of claim 8 , wherein the corrective action output comprises a control signal that disables reactivation of the HVAC system.

11. The method of claim 8 , wherein outputting comprises outputting the corrective action to a mobile device of a user associated with the HVAC system.

12. The method of claim 8 , wherein outputting the corrective action comprises outputting the corrective action to a controller of the HVAC system.

13. The method of claim 8 , wherein the corrective action output comprises a control signal that causes one or more fans of the HVAC system to activate.

14. The method of claim 8 , comprising retrieving a predefined ratio of the UV tracer to refrigerant before collecting the sample.

15. A non-transitory computer-readable medium comprising computer-executable instructions that, when executed, are configured to cause a processor to:
receive data from a sensor indicative of a concentration of an ultraviolet (UV) tracer measured to be in a monitored gas volume of an HVAC system;
retrieve a ratio of the UV tracer to a refrigerant from a database;
determine a concentration of leaked refrigerant in the monitored gas volume based on the concentration of the UV tracer measured to be in the monitored gas volume and the ratio of the UV tracer to the refrigerant;
define a corrective action output based on the concentration of the leaked refrigerant determined to be in the monitored gas volume exceeding a threshold; and
output the corrective action output to modify operation of the HVAC system.

16. The non-transitory computer-readable medium of claim 15 , wherein the computer-executable instructions are configured to cause the processor to:
output a control signal to the sensor causing the sensor to measure the concentration of the UV tracer.

17. The non-transitory computer-readable medium of claim 15 , wherein the computer-executable instructions, when executed, are configured to cause the processor to: output the corrective action to a mobile device of a user associated with the HVAC system.

18. The non-transitory computer-readable medium of claim 15 , wherein the correction action output is configured to generate an alarm.

19. The non-transitory computer-readable medium of claim 15 , wherein the corrective action output comprises an indication of the concentration of the leaked refrigerant.

20. The non-transitory computer-readable medium of claim 15 , wherein the corrective action output comprises a control signal that causes reactivation of the HVAC system to be disabled.

Assignees

• Johnson Controls Tyco IP Holdings LLP

Inventors

• Mcquade William F
• Gupte Neelkanth

Classifications

• F24F11/36 Primary

  to leakage of heat-exchange fluid · CPC title

• F25B49/02

  for compression type machines, plants or systems · CPC title

• G01M3/20

  using special tracer materials, e.g. dye, fluorescent material, radioactive material · CPC title

• G01N21/63

  optically excited · CPC title

• G05B15/02

  electric · CPC title