Air conditioner

Abstract

An air conditioner (1) is equipped with a plurality of use units (5), a vapor-compression refrigerant loop (10) and a liquid accumulator (25). The vapor-compression refrigerant loop (10) comprises the following components, a high-pressure part (10a) comprising components flowing through the high-pressure refrigerant with the maximum allowable pressure of 3.3MPa or higher, and a low-pressure part (10b) comprising components flowing through the low-pressure refrigerant of lower than the maximum allowable pressure of 3.3 MPa. The liquid accumulator (25) is one of components of the low-pressure part, and can store the refrigerant circulating in the refrigerant loop as liquid refrigerant. The refrigerant flowing in the low-pressure part and the high-pressure part is the simulated azeotropic mixture refrigerant, the azeotropic mixture refrigerant or the single refrigerant with the saturated pressure characteristic higher than that of R407C. Even if the highest use pressure in the refrigerant loop increases in the air conditioner with a plurality of use units, using of the invention can avoid the cost increase of the components of the refrigerant loop.

Description

technical field [0001] The invention relates to an air conditioner, in particular to an air conditioner with a plurality of utilization units. Background technique [0002] In air-conditioning apparatuses used for air conditioning of high-rise buildings, R407, which is an HFC-based refrigerant, is gradually being used as an operating refrigerant instead of R22 from the viewpoint of environmental protection. [0003] Since this kind of air-conditioning device used for air conditioning of high-rise buildings has multiple utilization units, the operating load fluctuates greatly. With the fluctuation of operating load, the refrigerant circulation amount in the refrigerant circuit also fluctuates. In the refrigerant circuit An increase or decrease of the remaining refrigerant occurs. This surplus refrigerant is stored as liquid refrigerant in an accumulator connected to the suction side of the compressor. [0004] However, if the remaining refrigerant is stored in storage, sinc...

AI Technical Summary

Problems solved by technology

In particular, in air conditioners used in high-rise buildings, the parts constituting the refrigerant circuit are larger in size compared to smaller air conditioners such as household air conditioners, so the portion of the refrigerant circuit through which high-pressure refrigerant flows (hereinafter referred to as the high-pressure portion) The maximum operating pressure also increases, so the compressive strength of the parts constituting the refrigerant circuit has to be increased, which tends to increase the cost

Therefore, in an air conditioner having the above-mentioned accumulator as one of the components of the high-voltage section, in order to increase the pressure resistance of the accumulator, the wall thickness must be increased, which increases the cost.

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