Compressor diagnostic and protection system and method

Patent metadata

Field	Value
Publication number	US-9669498-B2
Application number	US-201514841058-A
Country	US
Kind code	B2
Filing date	Aug 31, 2015
Priority date	Apr 27, 2004
Publication date	Jun 6, 2017
Grant date	Jun 6, 2017

Abstract

A method is provided that includes installing a compressor in a refrigeration system and determining a condenser temperature difference using processing circuitry. The method also includes checking for an overcharge condition or a condenser fan blockage condition when the condenser temperature difference is greater than a high condenser temperature difference value. The method also includes determining a discharge superheat temperature using the processing circuitry and checking for the overcharge condition or the condenser fan blockage condition when the condenser temperature difference is less than the high condenser temperature difference value and the discharge superheat temperature is less than a low discharge superheat temperature value. The method also includes checking for an undercharge condition or an evaporator fan blockage condition when the condenser temperature difference is less than the high condenser temperature difference value and the discharge superheat temperature is greater than a high discharge superheat temperature value. The method also includes completing installation of the compressor when the condenser temperature difference is between the high condenser temperature difference value and the low condenser temperature difference value and the discharge superheat is between the high discharge superheat temperature value and the low discharge superheat temperature value.

First claim

What is claimed is:

1. A method comprising:
installing at least one component in a refrigeration system;
operating the refrigeration system for a predetermined time period;
receiving, with processing circuitry, a compressor current of a compressor of the refrigeration system from a compressor current sensor during the predetermined time period;
receiving, with the processing circuitry, a compressor voltage of the compressor from a compressor voltage sensor during the predetermined time period;
receiving, with the processing circuitry, an ambient temperature with an ambient temperature sensor during the predetermined time period;
determining, with the processing circuitry, a condenser temperature based on the compressor current and the compressor voltage;
determining, with the processing circuitry, a condenser temperature difference based on the condenser temperature and the ambient temperature;
comparing, with the processing circuitry, the condenser temperature difference with a first predetermined range having a high condenser temperature difference threshold and a low condenser temperature difference threshold; and
completing installation of the at least one component in response to the condenser temperature difference being between the high condenser temperature difference threshold and the low condenser temperature difference threshold.

2. The method of claim 1 , further comprising:
receiving, with the processing circuitry, a discharge line temperature of the compressor with a discharge line temperature sensor during the predetermined time period;
determining, with the processing circuitry, a discharge superheat based on the discharge line temperature and the condenser temperature;
comparing, with the processing circuitry, the discharge superheat with a second predetermined range having a high discharge superheat threshold and a low discharge superheat threshold; and
completing installation of the at least one component in response to the discharge superheat being between the high discharge superheat threshold and the low discharge superheat threshold.

3. The method of claim 2 , further comprising:
checking for at least one of an overcharge condition and a condenser fan blockage condition in response to the condenser temperature difference being less than the low condenser temperature difference threshold and the discharge superheat being less than the low discharge superheat threshold.

4. The method of claim 2 , further comprising:
checking for at least one of an undercharge condition and an evaporator fan blockage condition in response to the condenser temperature difference being less than the low condenser temperature difference threshold and the discharge superheat being greater than the high discharge superheat threshold.

5. The method of claim 1 , further comprising:
checking for at least one of an overcharge condition and a condenser fan blockage condition in response to the condenser temperature difference being greater than the high condenser temperature difference threshold.

6. The method of claim 1 , wherein determining the condenser temperature includes determining a compressor power based on the compressor current and the compressor voltage and determining the condenser temperature based on the compressor power.

7. The method of claim 1 wherein the at least one component includes the compressor.

8. A method comprising:
installing a refrigeration system having a compressor;
operating the refrigeration system for a predetermined time period;
receiving, with processing circuitry, a compressor current of the compressor from a compressor current sensor during the predetermined time period;
receiving, with the processing circuitry, a compressor voltage of the compressor from a compressor voltage sensor during the predetermined time period;
receiving, with the processing circuitry, an ambient temperature with an ambient temperature sensor during the predetermined time period;
determining, with the processing circuitry, a condenser temperature based on the compressor current and the compressor voltage;
determining, with the processing circuitry, a condenser temperature difference based on the condenser temperature and the ambient temperature;
comparing, with the processing circuitry, the condenser temperature difference with a first predetermined range having a high condenser temperature difference threshold and a low condenser temperature difference threshold; and
completing installation of the refrigeration system in response to the condenser temperature difference being between the high condenser temperature difference threshold and the low condenser temperature difference threshold.

9. The method of claim 8 , further comprising:
receiving, with the processing circuitry, a discharge line temperature of the compressor with a discharge line temperature sensor during the predetermined time period;
determining, with the processing circuitry, a discharge superheat based on the discharge line temperature and the condenser temperature;
comparing, with the processing circuitry, the discharge superheat with a second predetermined range having a high discharge superheat threshold and a low discharge superheat threshold; and
completing installation of the refrigeration system in response to the discharge superheat being between the high discharge superheat threshold and the low discharge superheat threshold.

10. The method of claim 9 , further comprising:
checking for at least one of an overcharge condition and a condenser fan blockage condition in response to the condenser temperature difference being less than the low condenser temperature difference threshold and the discharge superheat being less than the low discharge superheat threshold.

11. The method of claim 9 , further comprising:
checking for at least one of an undercharge condition and an evaporator fan blockage condition in response to the condenser temperature difference being less than the low condenser temperature difference threshold and the discharge superheat being greater than the high discharge superheat threshold.

12. The method of claim 8 , further comprising:
checking for at least one of an overcharge condition and a condenser fan blockage condition in response to the condenser temperature difference being greater than the high condenser temperature difference threshold.

13. The method of claim 8 wherein determining the condenser temperature includes determining a compressor power based on the compressor current and the compressor voltage and determining the condenser temperature based on the compressor power.

14. A system comprising:
processing circuitry and a display, the processing circuitry being configured to receive a compressor current of a compressor of a refrigeration system from a compressor current sensor during a predetermined time period of operation of the refrigeration system after installation of at least one component in the refrigeration system, to receive a compressor voltage of the compressor from a compressor voltage sensor during the predetermined time period, to receive an ambient temperature with an ambient temperature sensor during the predetermined time period, to determine a condenser temperature based on the compressor current and the compressor voltage, to determine a condenser temperature difference based on the condenser temperature and the ambient temperature, to compare the condenser temperature difference with a first predetermined range having a high condenser temperature difference threshold and a low condenser temperature difference threshold, and to generate a predetermined output

Assignees

• Emerson Climate Technologies

Inventors

• Pham Hung M

Classifications

• B23P15/26 Primary

  heat exchangers {or the like (making heat exchangers by methods covered by other subclasses B21D53/02)} · CPC title

• F04C2270/80

  Diagnostics · CPC title

• F25B2700/1933

  Suction pressures · CPC title

• F25B1/04

  with compressor of rotary type ({F25B1/005,} F25B1/10 take precedence) · CPC title

• F25B2500/19

  Calculation of parameters · CPC title