Multiunit air conditioner and method for controlling outdoor fan operation

Abstract

The invention provides a multi-unit air conditioner for independent cooling / heating of rooms, including a system in which, depending on operation conditions, gas refrigerant discharged from a compressor 1 in an outdoor unit A is introduced into a distributor B through a first bypass pipe 11 directly, or via an outdoor unit heat exchanger 2 and a gas-liquid separator 3 with the refrigerant separated into gas and liquid refrigerant indirectly, wherefrom the liquid refrigerant is introduced into the compressor 1 after passed through an electric expansion valve 61a,61b,61c for an indoor unit C which cools the room, an indoor unit heat exchanger 62a,62b,62c, and a distributor B, and the gas refrigerant is introduced into the compressor 1 through a second bypass pipe 12 after passed through an indoor unit heat exchanger 62a,62b,62c and an electric expansion valve 61a,61b,61c for the indoor unit C which heats the room, the distributor B, the gas-liquid separator 3, the outdoor unit electric expansion valve 13a, and the outdoor unit heat exchanger 2. Further, the invention provides a method for controlling operation of an outdoor unit fan 2a in a multi-unit air conditioner including the steps of measuring a temperature of gas-liquid mixture refrigerant discharged from an outdoor unit heat exchanger 2, comparing a measured refrigerant temperature to a preset refrigerant temperature, to detect a gas-liquid mixture ratio, and varying a rotational speed of the outdoor unit fan 2a so that a detected gas-liquid mixture ratio becomes identical to a preset mixture ratio required for an intended operation condition.

Description

technical field [0001] The present invention relates to a multi-unit air conditioner. Background technique [0002] Generally, air conditioners are used to heat and cool places such as homes, restaurants, and offices. Currently, in order to effectively cool or heat a place divided into many rooms, there is a tendency to continuously develop multi-unit air conditioners. A multi-unit air conditioner generally has an outdoor unit and a plurality of indoor units, each of which is connected to the outdoor unit and installed in a room to cool the room while operating in cooling or heating mode. Cool or heat. [0003] However, although one room needs to be heated and another room needs to be cooled in a divided place, the multi-unit air conditioner can only work in a single mode of cooling or heating, so the limitation of the multi-unit air conditioner The problem lies in the inability to deal with the needs reasonably. [0004] For example, even in a building, depending on the...

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Problems solved by technology

[0003] However, although one room needs to be heated and another room needs to be cooled in a divided place, the multi-unit air conditioner can only work in a single mode of cooling or heating, so the limitation of the multi-unit air conditioner Sexuality lies in the inability to deal with needs reasonably

[0004] For example, even in a building, depending on the location of the room or the time, there will be a temperature difference between the rooms. situation, existing multi-unit air conditioners that only work in a single mode will not be able to handle

[0005] In addition, if a building is equipped with a computer room, the computer room needs to be cooled not only in summer, but also in winter to solve the heat load problem of computer-related equipment, and the existing multi-unit air conditioner cannot reasonably address this need

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