Regulation method for inverter compressors in refrigeration facilities
A regulation method for an inverter compressor in a refrigeration system including establishing a working area via limit values for evaporation temperatures, condensation temperatures, compressor speeds, maximum compression ratio, and maximum superheat value, and measuring working values of the compressor in terms of evaporation temperature, condensation temperature, and compression ratio. If the compressor operates outside the established working area, the method includes modifying the working parameters of the compressor by acting on elements to be selected among the compressor speed, the opening angle of the expansion valve, and a combination thereof. If the compressor does not go back to the working area within a certain time, the method includes stopping operation of the compressor and triggering an alarm.
1. A regulation method for an inverter compressor in a refrigeration system comprising an expansion valve, the refrigeration system operation being defined by an evaporation temperature, a condensation temperature, a compressor speed and a compression ratio, the regulation method comprising the following steps:
a) establishing a working area with predetermined values for:
minimum and maximum evaporation temperatures,
minimum and maximum condensation temperatures,
minimum and maximum compressor speeds,
a maximum compression ratio, which defines the relationship between an evaporation temperature and a condensation temperature,
a maximum superheat value,
b) measuring working values of the compressor according to the working values of:
the evaporation temperature,
the condensation temperature, and
the compression ratio, where,
in response to the compressor working values causing the refrigeration system to be operated at values which are outside the established working area, the method includes:
c) modifying working parameters in the refrigeration system by acting on elements to be selected between:
the compressor speed,
the opening angle of the expansion valve, and
a combination of the above,
such that, in response to the compressor not returning to operating at working values causing the refrigeration system to be operated at values which are in the established working area within a certain time, the compressor stops operating and triggers an alarm, wherein in response to the working evaporation temperature in the refrigeration system being lower than the minimum evaporation temperature required by the established working area, step c) comprises decreasing the compressor speed until the minimum evaporation temperature required to establish the working area is reached, and
wherein in response to the working evaporation temperature in the refrigeration system being lower than the established minimum evaporation temperature, further comprising:
d) closing the expansion valve until the predetermined maximum superheat value is reached.
2. The regulation method for an inverter compressor in a refrigeration system according to claim 1 , wherein in response to the working condensation temperature of the refrigeration system being higher than the established maximum condensation temperature, step c) comprises lowering the compressor speed to an established minimum.
3. The regulation method for an inverter compressor in a refrigeration system according to claim 2 , wherein in response to the working condensation temperature of the refrigeration system being higher than the established maximum condensation temperature, further comprising:
d) closing the expansion valve until the predetermined maximum superheat value is reached.
4. The regulation method for an inverter compressor in a refrigeration system according to claim 1 , wherein in response to the working condensation temperature of the refrigeration system being lower than the established minimum condensation temperature, step c) comprises opening the expansion valve.
5. The regulation method for an inverter compressor in a refrigeration system according to claim 1 , wherein in response to the working evaporation temperature of the refrigeration system being higher than the established maximum evaporation temperature, step c) comprises increasing the compressor speed to an established maximum.
6. The regulation method for an inverter compressor in a refrigeration system according to claim 1 , wherein in response to the working compression ratio of the refrigeration system being lower than an established minimum compression ratio, step c) comprises increasing the compressor speed to an established maximum.