Modular multi-connection control method and system

Abstract

The invention discloses a modular multi-connection control method and system. The control method comprises the following steps: determining the auxiliary engine capability requirement according to the total capability requirement of an indoor machine set and the best load point of a main engine; calculating the total number of the auxiliary engine compressors required to be input for the operation of the system according to the output capability of a single auxiliary engine compressor; and distributing the total number of the auxiliary engine compressors required to be input for the operationon average to each auxiliary engine, and distributing the parts which can not be distributed on average in each auxiliary engine one by one. According to the invention, through calculating the numberof the compressors required to be operated, the capability output of an outdoor machine set is basically and uniformly distributed to the main engine and each auxiliary engine of the outdoor machine set, the main engine and parts of auxiliary engine compressors are prevented from operating for a long time, the service life of each compressor of the whole machine set is prolonged, and the load energy efficiency ratio of the system part is improved greatly.

Description

technical field [0001] The present invention relates to the technical field of air conditioning, and more specifically, relates to a modular multi-connection control method and a system thereof. Background technique [0002] The multi-connected air-conditioning system only entered the Chinese market in the 1990s. It can meet consumers' requirements for comfort and convenience. Compared with traditional air conditioners, it has the advantages of free control, high efficiency and energy saving, and easy installation and maintenance. Quickly occupied an important position in the central air-conditioning market. Compared with multiple household air conditioners, its outdoor unit is shared, the installation is convenient and beautiful, and the investment is small. Centralized management of each indoor unit can be realized, one indoor unit can be started independently, or multiple indoor units can be started at the same time, making the control more flexible and energy-saving. ...

AI Technical Summary

Problems solved by technology

Although the capacity allocation method of the external unit is very simple and easy to implement, when the capacity demand of the air conditioning system is low, the main unit and the auxiliary units in front are almost fully loaded, while the auxiliary units in the rear are not running, resulting in the capacity output distribution among the external units. Very uneven, this kind of uneven output distribution of the external unit will lead to the following problems:

[0009] 1. Due to the almost full-load output of the main engine and the auxiliary machines in front, the compressor runs for a long time, which greatly affects the service life; while the auxiliary machines behind the row do not fully play their role, so that the overall energy efficiency is relatively low

[0010] 2. The uneven distribution of capacity output among multiple modules will easily lead to uneven distribution of refrigeration oil between external units, and in severe cases, it will cause some compressors to burn out due to lack of oil

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