Air conditioner

Abstract

An air conditioner capable of judging the adequacy of the refrigerant quantity in the refrigerant circuit with high accuracy while reducing the calculation load, includes a refrigerant circuit configured by the interconnection of a compressor, an outdoor heat exchanger, an indoor expansion valve, and an indoor heat exchanger; an operation controlling means capable of performing a refrigerant quantity judging operation to control constituent equipment such that the refrigerant circulation flow rate that is the refrigerant quantity circulating in the refrigerant circuit becomes constant; and a refrigerant quantity judging means that judges the adequacy of the refrigerant quantity in the refrigerant circuit using an operation state quantity of constituent equipment or refrigerant flowing in the refrigerant circuit during 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] In the past, in order to judge that the amount of refrigerant in the refrigerant circuit of the air conditioner is too insufficient, it is proposed to judge the refrigerant circuit according to the relationship between the value of the subcooling degree of the refrigerant at the outlet of the condenser and the refrigerant amount of the refrigerant circuit. Insufficient amount of refrigerant inside (for example, refer to Patent Document 1). [0003] In addition, in order to determine that the amount of refrigerant i...

AI Technical Summary

Problems solved by technology

Here, the values ​​of the heat transmission rate K and the average temperature difference change linearly due to fluctuations in the amount of refrigerant circulating in the refrigerant circuit (hereinafter referred to as the refrigerant circulation amount). Therefore, when the amount of refrigerant is unstable, , even if you want to use the subcooling degree at the outlet of the condenser to determine whether the refrigerant in the refrigerant circuit is suitable, there will still be a problem that the determination error will become larger

In addition, in the former method, the control of stabilizing the rotational speed of the compressor at the rotational speed target value is also performed, but even if the rotational speed of the compressor is stabilized at the target value, the refrigerant circulation amount is not necessarily stable, so the above-mentioned judgment error cannot be avoided. The problem

[0007] The latter method requires a very large number of calculations such as simulation of refrigeration cycle characteristics. If a calculation device such as a microcomputer installed in an air conditioner is used in the past, it will take a long time for calculation. In addition, it may not be possible to perform calculations.

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