Air conditioner

Abstract

An air conditioner in which judgment error due to difference in temperature of refrigerant at the outlet of a condenser is reduced at the time of judging whetehr the quantity of refrigerant is appropriate. The air conditioner (1) comprises a refrigerant circuit (10), an operation control means, and a refrigerant quantity judging means. The refrigerant circuit (10) is constituted by connecting a compressor (21), an outdoor heat exchanger (23), a supercooler (25), indoor expansion valves (41, 51), and indoor heat exchangers (42, 52). The operation control means can perform refrigerant quantity judging operation where the capacity of the supercooler (25) is controlled such that the temperature of refrigerant supplied from the supercooler (25) to the indoor expansion valves (41, 51) becomes constant. The refrigerant quantity judging means judges whether the quantity of refrigerant in the refrigerant circuit (10) is appropriate, based on the refrigerant flowing in the refrigerant circuit (10) or the operational state of constitutive apparatus in the refrigerant quantity judging operation.

Description

technical field [0001] The present invention relates to the function of judging whether the refrigerant quantity in the refrigerant circuit of the air conditioner is appropriate, especially relates to the function of judging the refrigerant quantity in the refrigerant circuit of the air conditioner connected by a compressor, a condenser, an expansion mechanism and an evaporator It is a function to judge whether it is suitable or not. Background technique [0002] Conventionally, for an air conditioner having a refrigerant circuit connected by a compressor, a condenser, an expansion valve, and an evaporator, a refrigerant quantity judgment operation for judging that the refrigerant quantity in the refrigerant circuit is too insufficient has been proposed. A method of judging that the amount of refrigerant in the refrigerant circuit is insufficient (for example, refer to Patent Document 1). [0003] Patent Document 1: Japanese Patent Laid-Open No. 3-186170 [0004] However, ...

AI Technical Summary

Problems solved by technology

[0004] However, in the above-mentioned method of judging that the amount of refrigerant in the refrigerant circuit is insufficient, the temperature of the refrigerant at the outlet of the condenser is different every time the refrigerant amount judging operation is performed.

This temperature difference of the refrigerant will cause a temperature difference of the refrigerant in the refrigerant pipe from the outlet of the condenser to the expansion valve, which constitutes a judgment error when judging that the amount of refrigerant is too insufficient

Especially in split-type air conditioners, the length of the refrigerant communication pipe connecting the heat source unit and the utilization unit varies depending on conditions such as the installation location. Therefore, when the refrigerant pipe is long, the refrigerant at the outlet of the condenser The difference in temperature will cause the temperature difference of the refrigerant in the liquid refrigerant communication pipe that constitutes most of the refrigerant piping from the outlet of the condenser to the expansion valve, and the judgment error tends to increase.

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