Refrigerating and air-conditioning apparatus and method for controlling refrigerating and air-conditioning apparatus

摘要

A refrigerating and air-conditioning apparatus, which includes a compressor, a condenser, an expansion device, and an evaporator, has a refrigeration cycle configured by these components being connected by a refrigerant pipe, and uses a non-azeotropic refrigerant mixture as a refrigerant circulating through the refrigeration cycle, includes operating state detection means which detect a pressure of the refrigerant at the compressor, a temperature of the refrigerant at the compressor, and a rotation speed of the compressor, output detection means which detects an output of the compressor, and composition detection means which calculates a correlation between the pressure of the refrigerant at the compressor, the temperature of the refrigerant at the compressor, the rotation speed of the compressor, the output of the compressor, and a refrigerant composition and retains data indicating the correlation.

主权项

1. A refrigerating and air-conditioning apparatus using an non-zeotropic refrigerant mixture as a refrigerant, the refrigerating and air-conditioning apparatus comprising:
a refrigerant cycle configured by a compressor, a condenser, an expansion device, and an evaporator connected by a refrigerant pipeline an operating state detection sensor configured to detect, as an operating state of the compressor, a pressure of the refrigerant at a suction side of the compressor, a pressure of the refrigerant at a discharge side of the compressor, a temperature of the refrigerant at the suction side of the compressor, and a rotation speed of the compressor, a power sensor configured to detect a first power consumption of the compressor, and a composition detection circuit that retains data indicating a one-to-one relationship between the first power consumption and a refrigerant composition, wherein the composition detection circuit is configured to
tentatively set an assumed value of the refrigerant composition,calculate a second power consumption of the compressor based on the assumed value of the refrigerant composition and the pressure of the refrigerant at the suction side of the compressor, the pressure of the refrigerant at the discharge side of the compressor, the temperature of the refrigerant at the suction side of the compressor, and the rotation speed of the compressor detected by the operation state detection device,when the calculated second power consumption of the compressor is within a range predetermined based on the detected first power consumption of the compressor, set the assumed value of the refrigerant composition as the refrigerant composition, andwhen the calculated second power consumption of the compressor is beyond the range,
set a value obtained by adding or subtracting a predetermined value δα from the assumed value of the refrigerant composition as the refrigerant composition andrecalculate the second power consumption of the compressor.