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Control method for outdoor fan in refrigeration of variable frequency multi-split air-conditioning unit

A multi-connected air conditioner and outdoor fan technology, which is applied in heating and ventilation control systems, space heating and ventilation, and heating methods, etc. Ensure normal cooling and avoid the effect of high pressure in the middle of the coil

Active Publication Date: 2015-07-22
NINGBO AUX ELECTRIC
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Problems solved by technology

[0007] The operating frequency of the inverter compressor changes continuously with the outdoor ambient temperature and the cooling capacity demand of the indoor unit (that is, the number of indoor units powered on), while the heat exchange area of ​​the outdoor heat exchanger is constant, and its heat exchange The volume depends on the wind gear of the fan. If the wind gear of the fan does not match the operating frequency of the compressor of the air conditioner. If the fan is too low, it will cause high pressure in the middle of the coil, high condensation temperature, high pressure failure, and normal cooling

Method used

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  • Control method for outdoor fan in refrigeration of variable frequency multi-split air-conditioning unit

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Embodiment Construction

[0022] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0023] Such as figure 1 As shown, the control method of the outdoor fan when the frequency conversion multi-connected air conditioner unit is cooling in the present invention, the specific steps are as follows.

[0024] a. Measure the outdoor ambient temperature through the second temperature sensor of the outdoor unit, and send the measurement result to the main controller of the air conditioner.

[0025] b. Determine whether the outdoor ambient temperature is ≥ 45°C. If yes, continue to run the outdoor fan 2 at high wind speed until the outdoor ambient temperature drops to 40°C, and then go to step c; if not, go to step c directly. If the outdoor ambient temperature is 50°C, continue to run the outdoor fan 2 at a high wind speed until the outdoor ambient temperature drops to 40°C, and then enter step c; if the outdoor ambient temperature is ...

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Abstract

The invention discloses a control method for an outdoor fan in refrigeration of a variable frequency multi-split air-conditioning unit, which comprises the key step that the operating wind level of the outdoor fan (2) is adjusted in real time through the overall consideration on outdoor environment temperature, the proportion of the number of started indoor units to the total number of indoor units, and condensing temperature. The control method can enable the operation frequency of the outdoor fan to be reasonable.

Description

technical field [0001] The invention relates to a multi-connected air-conditioning unit, in particular to a method for controlling an outdoor fan during cooling of the frequency-variable multi-connected air-conditioning unit. Background technique [0002] The multi-connected air conditioner unit in the prior art includes an outdoor unit, a plurality of indoor units connected in parallel, and two refrigerant circulation main pipes connecting each indoor unit and the outdoor unit. The outdoor unit communicates with multiple indoor units connected in parallel through two refrigerant circulation main pipes. [0003] Each outdoor unit includes a compressor, oil separator, four-way reversing valve, outdoor heat exchanger (condenser in cooling mode), liquid receiver and gas-liquid separator. The outlet of the compressor communicates with one end of the oil separator, the other end of the oil separator communicates with the first valve port of the four-way reversing valve, the seco...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F24F11/00F24F13/24
Inventor 郑坚江侯丽峰
Owner NINGBO AUX ELECTRIC
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