System for refrigerant charge verification
First Claim
1. A diagnostic system for a refrigeration system including a compressor and a condenser having an inlet, an outlet, and a coil circuit tube extending between the inlet and the outlet, the compressor and the condenser being connected in a circuit, the diagnostic system comprising:
- a first coil temperature sensor located on said coil circuit tube a first distance from said inlet, wherein said first coil temperature sensor provides a signal indicative of a first coil temperature;
a second temperature sensor located on said coil circuit tube a second distance from said inlet, wherein said second temperature sensor provides a signal indicative of a second coil temperature;
a liquid line temperature sensor located on said circuit downstream of said outlet of said condenser having said first coil temperature sensor and said second coil temperature sensor and providing a signal indicative of a liquid line temperature of a liquid circulating within said circuit;
an outdoor ambient temperature sensor providing a signal indicative of an ambient temperature;
a controller receiving said first coil temperature, said second coil temperature, said liquid line temperature, and said ambient temperature from said first coil temperature sensor, said second coil temperature sensor, said liquid line temperature sensor, and said outdoor ambient temperature sensor, respectively;
said controller calculates a subcooling temperature of said refrigeration system, an approach temperature of said condenser, and a condenser temperature difference of said condenser from said first coil temperature, said second coil temperature, said liquid line temperature, and said ambient temperature,wherein said controller determines at least one of a fault condition of said refrigeration system and a charge of said refrigeration system based on said subcooling temperature, said approach temperature, and said condenser temperature difference, andwherein said controller determines an undercharge condition when said condenser temperature difference is less than a first threshold and a ratio of said approach temperature and said condenser temperature difference is greater than a second threshold different than said first threshold.
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Abstract
A diagnostic system for a refrigeration system including a condenser is provided. The diagnostic system may include a controller determining a subcooling temperature of the refrigeration system, an approach temperature of the condenser, and a condenser temperature difference of the condenser. The controller may determine at least one of a fault condition of the refrigeration system and a charge of the refrigeration system based on the subcooling temperature, the approach temperature, and the condenser temperature difference.
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Citations
21 Claims
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1. A diagnostic system for a refrigeration system including a compressor and a condenser having an inlet, an outlet, and a coil circuit tube extending between the inlet and the outlet, the compressor and the condenser being connected in a circuit, the diagnostic system comprising:
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a first coil temperature sensor located on said coil circuit tube a first distance from said inlet, wherein said first coil temperature sensor provides a signal indicative of a first coil temperature; a second temperature sensor located on said coil circuit tube a second distance from said inlet, wherein said second temperature sensor provides a signal indicative of a second coil temperature; a liquid line temperature sensor located on said circuit downstream of said outlet of said condenser having said first coil temperature sensor and said second coil temperature sensor and providing a signal indicative of a liquid line temperature of a liquid circulating within said circuit; an outdoor ambient temperature sensor providing a signal indicative of an ambient temperature; a controller receiving said first coil temperature, said second coil temperature, said liquid line temperature, and said ambient temperature from said first coil temperature sensor, said second coil temperature sensor, said liquid line temperature sensor, and said outdoor ambient temperature sensor, respectively; said controller calculates a subcooling temperature of said refrigeration system, an approach temperature of said condenser, and a condenser temperature difference of said condenser from said first coil temperature, said second coil temperature, said liquid line temperature, and said ambient temperature, wherein said controller determines at least one of a fault condition of said refrigeration system and a charge of said refrigeration system based on said subcooling temperature, said approach temperature, and said condenser temperature difference, and wherein said controller determines an undercharge condition when said condenser temperature difference is less than a first threshold and a ratio of said approach temperature and said condenser temperature difference is greater than a second threshold different than said first threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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- 11. A controller determining at least one of a fault condition of a refrigeration system and a charge condition of the refrigeration system based on a subcooling temperature of the refrigeration system, an approach temperature of a condenser, and a condenser temperature difference of the condenser, wherein said controller determines an undercharge condition when said condenser temperature difference is less than a first threshold and a ratio of said approach temperature and said condenser temperature difference is greater than a second threshold different than said first threshold.
Specification