Refrigerant tracking/leak detection system and method

• US 20060179854A1
• Filed: 02/16/2006
• Published: 08/17/2006
• Est. Priority Date: 02/16/2005
• Status: Active Grant

• Current Assignee: Zero Zone, Inc.
• Original Assignee: Zero Zone, Inc.
• Inventors: Esslinger, Steve
• Granted Patent: US 7,640,758 B2
• Time in Patent Office: Days
• 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 mass of refrigerant, a reservoir containing a first portion of the mass of refrigerant, and a condenser containing a second portion of the mass of refrigerant. A first sensor is positioned to measure a first parameter of the reservoir and output a first signal indicative of the first parameter. A second sensor is positioned to measure a second parameter of the condenser and output a second signal indicative of the second parameter. A processor receives the first signal and the second signal to calculate a weight of missing refrigerant.

Claims

1. A refrigeration system comprising:

a mass of refrigerant;

a reservoir containing a first portion of the mass of refrigerant;

a condenser containing a second portion of the mass of refrigerant;

a first sensor positioned to measure a first parameter of the reservoir and output a first signal indicative of the first parameter;

a second sensor positioned to measure a second parameter of the condenser and output a second signal indicative of the second parameter; and

a processor coupled to the first sensor and the second sensor to receive the first signal and the second signal, the processor operable in response to the first signal and the second signal to calculate a weight of missing refrigerant.

2. The refrigeration system of claim 1, further comprising an evaporator, a compressor, and a piping system fluidly connecting the reservoir, the condenser, the evaporator, and the compressor, the piping system including a first resilient portion fluidly connected to the reservoir, and a second resilient portion fluidly connected to the condenser.

3. The refrigeration system of claim 2, wherein the first resilient portion moves in response to a change in the relative position between a portion of the piping system and the reservoir.

4. The refrigeration system of claim 2, wherein the second resilient portion moves in response to a change in the relative position between a portion of the piping system and the condenser.

5. The refrigeration system of claim 1, wherein the first parameter is at least partially indicative of the weight of the reservoir, and the second parameter is at least partially indicative of the weight of the condenser.

6. The refrigeration system of claim 5, further comprising a data storage device operable to store a weight value indicative of the weight of at least one of the reservoir and the condenser, the data storage device in communication with the processor.

7. The refrigeration system of claim 6, wherein the processor compares the weight value to the sum of the sensed weight of the reservoir and the sensed weight of the condenser to determine the weight of missing refrigerant.

8. The refrigeration system of claim 7, further comprising an alarm operable in one of an actuated and non-actuated state, the alarm transitioning from the non-actuated to the actuated state in response to the calculated weight of missing refrigerant exceeding a predetermined value.

9. The refrigeration system of claim 1, further comprising a signal conditioner manipulating the first and second signals.

10. The refrigeration system of claim 1, wherein the first sensor and the second sensor are each operable to measure a weight and generate a signal indicative of the measured weight.

11. A method of operating a refrigeration system including a quantity of refrigerant having a known weight, the method comprising:

operating a compressor to compress at least a portion of the quantity of refrigerant and produce a flow of compressed refrigerant;

directing the flow of compressed refrigerant through a condenser to condense the flow of refrigerant and to a reservoir to collect the flow of refrigerant;

weighing the condenser to generate a first signal indicative of the weight of the condenser and the weight of the refrigerant within the condenser;

weighing the reservoir to generate a second signal indicative of the weight of the reservoir and the weight of the refrigerant within the reservoir;

processing the first signal and the second signal to calculate a total weight of refrigerant; and

comparing the calculated total weight of refrigerant to the known weight to determine a weight of lost refrigerant.

12. The method of claim 11, further comprising recording a value indicative of the weight of lost refrigerant.

13. The method of claim 11, further comprising actuating an alarm in response to the weight of lost refrigerant exceeding a predetermined value.

14. The method of claim 11, wherein processing the first signal and the second signal includes

converting the first signal to a first measured weight,

converting the second signal to a second measured weight, and

adding the first measured weight to the second measured weight.

15. The method of claim 11, further comprising moving a first resilient portion fluidly connected to the reservoir in response to relative movement between the reservoir and a portion of piping.

16. The method of claim 15, further comprising moving a second resilient portion fluidly connected to the condenser in response to relative movement between the condenser and a portion of piping.

17. A refrigeration system comprising:

a compressor assembly operable to deliver a flow of compressed refrigerant;

a condenser receiving the flow of compressed refrigerant and discharging a flow of condensed refrigerant;

a first sensor coupled to the condenser and operable to output a first signal indicative of the weight of the condenser and the refrigerant entrained therein;

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

a second sensor coupled to the reservoir and operable to output a second signal indicative of the weight of the reservoir and the refrigerant entrained therein;

a processor operable to calculate a weight of refrigerant within the refrigeration system at least partially in response to the first signal and the second signal; and

a passageway interconnecting the condenser and the reservoir to provide fluid communication therebetween, the passageway including a resilient portion movable in response to relative movement between the condenser and the remainder of the passageway.

18. The refrigeration system of claim 17, wherein the processor is operable to compare the calculated weight to a known weight to determine a weight of lost refrigerant.

19. The refrigeration system of claim 18, further comprising an alarm transitionable from a non-alarm condition to an alarm condition in response to the weight of lost refrigerant exceeding a predetermined value.

20. The refrigeration system of claim 17, wherein the resilient portion is disposed adjacent the condenser, the passageway further comprising a second resilient portion disposed adjacent the condenser and movable in response to relative movement between the condenser and the remainder of the passageway.