Air conditioner system and control method thereof

Abstract

The invention discloses an air conditioner system and a control method thereof. The air conditioner system comprises an outdoor unit and one or more indoor units connected in parallel; the outdoor unit comprises a compressor, a gas-liquid separator, an oil separator, a four-way valve, an outdoor heat exchanger, an outdoor throttling element and a first cutoff valve; each indoor unit comprises an indoor heat exchanger; the first cutoff valve and the outdoor throttling element are connected in parallel; the air conditioner system also comprises a heat storing heat exchanger provided with a heat absorption heat exchange pipe, a heat releasing heat exchange pipe, a regulation valve and a second cutoff valve; the heat absorption heat exchange pipe and the regulation valve are connected in series to form a serial connection pipeline which is connected with the indoor unit in parallel; the heat releasing heat exchange pipe and the second cutoff valve are connected in parallel and form a parallel connection pipeline which is serially connected onto the pipeline between the gas-liquid separator and the four-way valve. The heat storing heat exchanger of the air conditioner system is flexible in arrangement, fast in defrosting speed, high in comfort level and capable of effectively avoiding the liquid slugging condition during the defrosting operation.

Description

technical field [0001] The invention relates to the technical field of air conditioning, in particular to an air conditioning system and a control method thereof. Background technique [0002] At present, commonly used heat pump air-conditioning systems (including multi-split systems) add a four-way valve to the cooling-only air-conditioning system, and realize cooling and heating conversion through the reversing of the four-way valve. After the unit has been in heating operation for a period of time, frost will appear on the surface of the outdoor heat exchanger, especially with the decrease of the outdoor ambient temperature and the increase of humidity, the frost will become more and more serious, which will directly affect the heating effect and comfort. Usually, in order to restore the heating effect of the unit, the unit needs to switch to cooling operation for defrosting, at this time the indoor unit will not be able to heat and the temperature will drop. In additio...

AI Technical Summary

Problems solved by technology

[0004] 1. Since the heat storage heat exchanger can only be installed on the outdoor unit, the structural design is inflexible and occupies a large space, resulting in a large size of the outdoor unit

[0005] 2. Since this solution uses the medium-temperature and high-pressure refrigerant condensed by the indoor unit to store heat, the phase change temperature point of the phase change heat storage material used will inevitably be lower, and the heat absorption and heat release speed of the heat storage material will be lower. Slower, which makes the defrosting speed slower and prolongs the defrosting time, which also affects the heating effect and comfort

[0006] 3. In addition, defrosting when the heat storage capacity of the heat storage heat exchanger is insufficient will cause a large amount of refrigerant that cannot be evaporated to enter the compressor, thus posing a fatal threat to the reliability of the compressor

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