Heat recovery multi-online system and control method thereof

Abstract

The invention relates to a heat recovery multi-online system and a control method thereof. The heat recovery multi-online system comprises a compressor, a four-way valve, an outdoor heat exchanger, a plurality of indoor units, a high-pressure air pipe, a medium-pressure liquid pipe, a low-pressure air pipe, a balance pipe, a first solenoid valve and a second solenoid valve. Two ends of the high-pressure air pipe are respectively connected with the exhaust end of the compressor and the plurality of indoor units. Two ends of the medium-pressure liquid pipe are respectively connected with the outdoor heat exchanger and the plurality of indoor units. Two ends of the low-pressure air pipe are respectively connected with the air suction end of the compressor and the plurality of indoor units. The compressor, the outdoor heat exchanger, and the indoor units form a circulation loop. The first solenoid valve is arranged on the high-pressure air pipe. Two ends of the balance pipe are respectively connected with the middle part of the high-pressure air pipe and the middle part of the low-pressure air pipe. The junction of the balance pipe and the high-pressure air pipe is between the first solenoid valve and the plurality of indoor units. The second solenoid valve is arranged on the balance pipe, so as to achieve an objective of improving refrigeration efficiency.

Description

technical field [0001] The invention relates to the field of air conditioning, in particular to a heat recovery multi-connection system and a control method for the heat recovery multi-connection system. Background technique [0002] In the existing technology, the multi-connected system has the characteristics of energy saving, high efficiency and easy maintenance, and the level of energy saving can also be reflected by EER, IPLV, APF and other test monitoring data. As a typical multi-line product, the heat recovery multi-line system has high energy efficiency. [0003] The current heat recovery multi-line system generally adopts a three-pipe design scheme. There are three sets of high-pressure air pipes, medium-pressure liquid pipes, and low-pressure air pipes in the external machine system. Ordinary heat pump multi-connected systems generally have two pipelines: gas pipe and liquid pipe. The operating principle of the heat recovery multi-connection system is different f...

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Problems solved by technology

[0007] Existing heat recovery multi-connected systems cannot change the presence of refrigerant in the high-pressure gas pipe. There is a large amount of refrigerant in the high-pressure gas pipe that cannot effectively participate in the system operation, which has a great impact on the energy efficiency of the system and even affects the cooling effect.

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