Refrigerant tracking/leak detection system and method

• US 7,377,118 B2
• Filed: 05/03/2006
• Issued: 05/27/2008
• Est. Priority Date: 02/16/2005
• Status: Active Grant

• Current Assignee: Zero Zone, Inc.
• Original Assignee: Zero Zone, Inc.
• Inventors: Esslinger, Steve L.
• Primary Examiner(s): Jones; Melvin
• Application Number:
  US11/417,082
• Publication Number:
  US 20060196224A1
• Time in Patent Office: 755 Days
• Field of Search: 621/49, 621/29, 625/09, 625/13
• US Class Current: 62/149
• CPC Class Codes: F25B 2400/075 with parallel compressors
• CPC Class Codes: F25B 2500/19 Calculation of parameters
• CPC Class Codes: F25B 2500/222 Detecting refrigerant leaks
• CPC Class Codes: F25B 2700/04 Refrigerant level
• CPC Class Codes: F25B 49/005 of safety devices F25B49/02 and F25B49/04 take precedence

Abstract

A refrigeration system includes a heat exchanger that is operable to cool a flow of compressed refrigerant and a first sensor coupled to the heat exchanger and operable to generate a first signal indicative of a heat exchanger liquid level. A reservoir is in fluid communication with the heat exchanger to receive the flow of cooled compressed refrigerant and a second sensor is coupled to the reservoir and is operable to generate a second signal indicative of a reservoir liquid level. A processor is operable to calculate a first weight of liquid within the heat exchanger in response to the first signal, and to calculate a second weight of liquid within the reservoir in response to the second signal.

Claims

1. A refrigeration system comprising:

a heat exchanger operable to cool a flow of compressed refrigerant;

a first sensor coupled to the heat exchanger and operable to generate a first signal indicative of a heat exchanger liquid level;

a reservoir in fluid communication with the heat exchanger to receive the flow of cooled compressed refrigerant;

a second sensor coupled to the reservoir and operable to generate a second signal indicative of a reservoir liquid level; and

a processor operable to calculate a first weight of liquid within the heat exchanger in response to the first signal, and to calculate a second weight of liquid within the reservoir in response to the second signal.

2. The refrigeration system of claim 1, further comprising a container coupled to and in fluid communication with the heat exchanger, the first sensor disposed at least partially within the container.

3. The refrigeration system of claim 1, wherein the heat exchanger includes a first portion and a second portion each operable to cool a portion of the flow of compressed refrigerant.

4. The refrigeration system of claim 3, wherein the second portion is separable from the first portion such that the first portion cools the entire flow of compressed refrigerant.

5. The refrigeration system of claim 3, further comprising a first container coupled to and in fluid communication with the first portion and a second container coupled to and in fluid communication with the second portion.

6. The refrigeration system of claim 5, further comprising a third sensor, and wherein the first sensor is disposed at least partially within the first container and the third sensor is disposed at least partially within the second container and is operable to generate a third signal indicative of a liquid level within the second portion.

7. The refrigeration system of claim 1, wherein the processor is operable to compare the sum of the first weight and the second weight to a known weight to determine a weight of missing refrigerant.

8. The refrigeration system of claim 1, further comprising a piping system, an evaporator, and a compressor that contain a quantity of fluid, the quantity of fluid being substantially fixed.

20. The refrigeration system of claim 1, further comprising a piping system, an evaporator, and a compressor that contain a quantity of refrigerant that is substantially fixed.

9. A refrigeration system comprising:

a compressor operable to deliver a flow of compressed refrigerant;

a condenser in fluid communication with the compressor to receive the flow of compressed refrigerant, the condenser operable to cool the flow of compressed refrigerant;

a reservoir in fluid communication with the condenser to receive the cooled flow of compressed refrigerant;

an evaporator in fluid communication with the reservoir and operable to cool a space in response to the passage of a portion of the cooled flow of compressed refrigerant;

a container coupled to and in fluid communication with the reservoir;

a first sensor at least partially disposed within the container and operable to generate a first signal indicative of a first liquid level;

a second sensor coupled to the reservoir and operable to generate a second signal indicative of a reservoir liquid level; and

a processor operable to calculate a total weight of refrigerant in response to the first signal and the second signal, and compare the total weight of refrigerant to a known weight of refrigerant to determine a weight of missing refrigerant.

10. The refrigeration system of claim 9, wherein the condenser includes a first portion and a second portion each operable to cool a portion of the flow of compressed refrigerant.

11. The refrigeration system of claim 10, wherein the second portion is separable from the first portion such that the first portion cools the entire flow of compressed refrigerant.

12. The refrigeration system of claim 10, further comprising a second container coupled to and in fluid communication with the second portion, the container coupled to and in fluid communication with the first portion.

13. The refrigeration system of claim 12, further comprising a third sensor disposed at least partially within the second container and operable to generate a third signal indicative of a refrigerant level within the second portion.

14. The refrigeration system of claim 9, further comprising a piping system that interconnects the condenser, the compressor, the reservoir, and the evaporator, the piping system, the compressor, and the evaporator containing a substantially fixed weight of refrigerant.

15. A refrigeration system comprising:

a condenser including a first portion and a second portion, each of the first portion and the second portion operable to cool at least a portion of a flow of compressed refrigerant;

a first sensor coupled to the first portion and operable to generate a first signal indicative of a first liquid level within the first portion;

a second sensor coupled to the second portion and operable to generate a second signal indicative of a second liquid level within the second portion;

a reservoir in fluid communication with the condenser to receive the flow of compressed refrigerant;

a third sensor coupled to the reservoir and operable to generate a third signal indicative of a third liquid level within the reservoir; and

a processor operable to calculate a total weight of refrigerant in response to the first signal, the second signal, and the third signal.

16. The refrigeration system of claim 15, wherein the processor is operable to compare the total weight of refrigerant to a known weight of refrigerant to determine a weight of missing refrigerant.

17. The refrigeration system of claim 15, wherein the second portion is separable from the first portion such that the first portion cools the entire flow of compressed refrigerant.

18. The refrigeration system of claim 15, further comprising a first container coupled to and in fluid communication with the first portion and a second container coupled to and in fluid communication with the second portion.

19. The refrigeration system of claim 18, wherein the first sensor is disposed at least partially within the first container and the second sensor is disposed at least partially within the second container.