Modular multi-split air conditioner and control method for uniformly distributing refrigerant during refrigeration thereof

Abstract

The invention provides a control method for uniformly distributing a refrigerant during refrigeration of a modular multi-split air conditioner. The control method comprises the following steps of a) calculating the total capacity requirement N of an indoor unit module for m outdoor unit modules connected in parallel under the refrigeration operation state; b) initially distributing the capacity requirement of each outdoor unit module; c) detecting the bottom temperature Tbi of a compressor of the ith outdoor unit module by using a first temperature sensor; d) detecting the air return temperature Tri of the compressor of the ith outdoor unit module by using a second temperature sensor; e) calculating the air return superheat SHi of the ith outdoor unit module according to a formula that Shi=Tbi-Tri; f) adjusting the capacity requirement Ni of the ith outdoor unit module according to the air return superheat Shi of the ith outdoor unit module, making the air return superheat Shi and the adjusted capacity requirement NI' meet the following function: I=1,2,3,ellipsis,m, wherein NI'=[NI']=min{n belongs to Z and NI' is less than or equal to n}, and repeating steps c, d, e and f every ten minutes. The invention also provides a modular multi-split air conditioner for uniformly distributing a refrigerant during refrigeration. By the control method, the refrigerant in outdoor unit modules is distributed uniformly.

Description

technical field [0001] The invention belongs to the technical field of air conditioning, and in particular relates to a modular multi-split unit and a control method for uniform distribution of refrigerant during refrigeration. Background technique [0002] At present, the parallel connection of multiple outdoor units is a common installation form of multi-connected units. The installation process is simple, and the capacity output can be freely combined. However, the refrigerant charged by parallel multi-connected units is more. The need for even distribution is a difficult point at present. For the heating mode, the current common practice is to adjust the return air volume by adjusting the opening of the electronic expansion valve of the outdoor unit; for the cooling mode, the superheat is generally adjusted by adjusting the opening of the electronic expansion valve of the indoor unit. However, from the indoor unit In the process from the outlet pipe of the parallel outd...

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Problems solved by technology

[0003] The purpose of the embodiments of the present invention is to provide a control method for evenly distributing refrigerant in modular multi-unit refrigeration, aiming to solve the problem of uneven distribution of refrigerant in each outdoor unit module in the cooling operation of multi-unit in the prior art question

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