Air conditioner

Abstract

An air conditioner is disclosed, even if spaces to be air conditioned by the air conditioner have different temperatures, an error of determination of the amount of refrigerant can be reduced. The air conditioner (1) adjusts the temperature of spaces and has a refrigerant circuit (10) and a control section (8). The refrigerant circuit (10) is constructed by connecting a compressor (21), an outdoor heat exchanger (23), indoor expansion valves (41, 51), and indoor heat exchangers (42, 52). The control section (8) performs temperature control so that the spaces are at predetermined temperatures. Also, the control section (8) determines the amount of the refrigerant in the refrigerant circuit (10) based on at least either the refrigerant flowing in the refrigerant circuit (10) or operation state quantities of constituting devices. Before the control device (8) determines the amount of the refrigerant, it sets the temperatures of the spaces so that the temperatures satisfy predetermined temperature conditions.

Description

technical field [0001] The present invention relates to the function of judging the amount of refrigerant in the refrigerant circuit of an air conditioner, and in particular to the refrigerant circuit of an air conditioner composed of a compressor, a heat source side heat exchanger, an expansion mechanism, and a utilization side heat exchanger. The function of judging the amount of refrigerant in it. Background technique [0002] Conventionally, in order to determine that the amount of refrigerant in the refrigerant circuit of an air conditioner is insufficient, a method of simulating the characteristics of the refrigeration cycle and using the calculation results to determine the insufficient amount of refrigerant has been proposed (for example, refer to Patent Document 1). [0003] Patent Document 1: Japanese Patent Laid-Open No. 3-186170 [0004] In a conventional air conditioner, a refrigerant quantity determination operation is performed by performing an operation mode...

AI Technical Summary

Problems solved by technology

[0006] However, in the former correction calculation process, the judgment error tends to increase as the actual operating state is farther from the low-pressure target value suitable for refrigerant quantity judgment operation.

In this way, it is sometimes difficult to sufficiently reduce the error by correction operation processing, so a method of reducing error by a method other than correction operation processing is desired.

[0007] As for the latter, in order to prepare a regression method that can obtain accurate judgment results in advance for each low pressure target value, a huge amount of data is required, which is difficult in reality.

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