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Control method for preventing bias flow of refrigerants during heating of multi-connected air conditioning unit

A technology of multi-connected air conditioners and control methods, which is applied in the directions of space heating and ventilation, heating and ventilation control systems, and household heating, etc., can solve the problem of poor heating effect, affect the promotion and application of multi-connected air conditioners, and cannot guarantee Indoor mechanism heating effect and other problems, to achieve the effect of preventing refrigerant drift

Active Publication Date: 2013-08-07
NINGBO AUX ELECTRIC
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Once the refrigerant flow is biased, the outdoor unit with more refrigerant will accumulate too much refrigerant, causing waste, while the indoor unit with less refrigerant will have a poor heating effect, and the heating effect of each indoor unit cannot be guaranteed. Popularization and Application of Type Air Conditioning

Method used

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  • Control method for preventing bias flow of refrigerants during heating of multi-connected air conditioning unit

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Embodiment Construction

[0024] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0025] like figure 1 As shown in the present invention, the control method for preventing the biased flow of the refrigerant during heating of the multi-connected air-conditioning unit of the present invention, its specific steps are as follows:

[0026] a. Turn on the compressor 1 of the outdoor unit to run for a period of time, which specifically means that the compressor of any outdoor unit of the multi-connected air conditioner unit is turned on for a period of time.

[0027] The period of time described in step a refers to 10 to 30 minutes, preferably 15 minutes.

[0028] b. Measure the temperature T in the middle of the indoor heat exchanger 2 of each indoor unit through the temperature sensor 3 in the middle of the indoor heat exchanger 2 of each indoor unit 0 , send the temperature measurement results to the main controller of the air c...

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Abstract

The invention discloses a control method for preventing bias flow of refrigerants during heating of a multi-connected air conditioning unit. The method comprises the following steps of: a, starting the multi-connected air conditioning unit; b, measuring a middle temperature T0 of an indoor heat exchanger (2), wherein an indoor machine of which the T0 is the highest has the most refrigerants, and the indoor machine of which the T0 is the lowest has the fewest refrigerants; c, measuring an outlet temperature T1min of the indoor heat exchanger (2) of the indoor machine which has the fewest refrigerants, measuring an outlet temperature T1max of the indoor heat exchanger (2) of the indoor machine which has the most refrigerants, and calculating a difference value delta T between the T1min and the T1max; d, judging whether the delta T is more than or equal to 5, if so, increasing the aperture of an indoor machine electronic expansion valve (4) of the indoor machine which has the fewest refrigerants, and decreasing the aperture of the indoor machine electronic expansion valve (4) of the indoor machine which has the most refrigerants; and e, repeating the steps b to d at certain intervalsuntil the multi-connected air conditioning unit is shut down. By the method, heating effect of each indoor machine is better, and waste is avoided.

Description

technical field [0001] The invention relates to a multi-connected air-conditioning unit, in particular to a control method for preventing refrigerant bias flow during heating of the multi-connected air-conditioning unit. Background technique [0002] A multi-connected air conditioning unit in the prior art includes one or more outdoor units, a plurality of indoor units connected in parallel with each other, and two refrigerant circulation pipes connecting each indoor unit and each outdoor unit. If there is one outdoor unit, the outdoor unit is connected to multiple indoor units in parallel through two refrigerant circulation pipes; if there are multiple outdoor units, multiple outdoor units are connected in parallel, and the paralleled outdoor units pass through two refrigerant circulation pipes Connect with the indoor unit connected in parallel. [0003] Each outdoor unit includes compressor, oil separator, four-way reversing valve, outdoor heat exchanger (evaporator in he...

Claims

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Application Information

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