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US 7,752,853 B2Granted
Monitoring refrigerant in a refrigeration system
AssigneeEmerson Retail Services, Inc.
InventorsAbtar Singh, Thomas J. Mathews, Stephen T. Woodworth, Pawan K. Churiwal, James R. Mitchell, Ozgur Y. Gurkan
Life of this patent
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Abstract
A method for monitoring refrigerant in a refrigeration system includes sensing, a refrigerant pressure of a refrigeration system, averaging the refrigerant pressure over a time period, determining an expected pressure based on said time period, comparing the average to the expected pressure, and determining a system condition based on said comparison. The method may be executed by a controller or stored in a computer-readable medium.
Claims32
A method comprising:
- sensing refrigerant pressure in a refrigeration system;
- calculating a first refrigerant pressure parameter based on sensing said refrigerant pressure over a first time period;
- calculating a second refrigerant pressure parameter based on sensing said refrigerant pressure over a second time period, said second time period occurring after said first time period;
- calculating a difference between said first refrigerant pressure parameter and said second refrigerant pressure parameter;
- comparing said difference between said first and second refrigerant pressure parameters and a predetermined threshold;
- and
- determining a system condition based on said comparison.
4 more elements
A method comprising:
- sensing suction pressure and discharge pressure in a refrigeration system;
- calculating a first suction pressure parameter based on sensing said suction pressure over a first time period;
- calculating a second suction pressure parameter based on sensing said suction pressure over a second time period, said second time period occurring after said first time period;
- calculating a second discharge pressure parameter based on sensing said discharge pressure over said second time period;
- comparing a difference between said first and second suction pressure parameters to a predetermined suction pressure threshold;
- issuing a first system notification when said difference between said first and second suction pressure parameters is greater than said predetermined suction pressure threshold;
- and
- when said difference between said first and second suction pressure parameters is less than said predetermined suction pressure threshold, comparing a difference between said first discharge pressure parameter and said second discharge pressure parameter to a predetermined discharge pressure threshold and issuing a second system notification when said difference between said first and second pressure parameters is greater than said predetermined discharge pressure threshold.
5 more elements
Dependencies are inferred from the claim text.