Multi-split air conditioning system and status switching control method therefor

Abstract

The invention discloses a multi-split air conditioning system and a status switching control method therefor. The multi-split air conditioning system comprises an outdoor unit and indoor units installed in multiple rooms. The outdoor unit comprises a compressor, a compressor controller and a condenser; each indoor unit comprises an electronic expansion valve, an electronic expansion valve driver, an evaporator, an indoor air temperature detector disposed in one room, and a refrigerant superheat detector disposed at an outlet of the evaporator, wherein the compressor forms a loop with the condenser, the electronic expansion valve and the evaporators. The status switching control method includes: acquiring a difference between the indoor actually-measured temperature of one room and the preset temperature to determine operation status of the electronic expansion valve driver and transmit the status information to the compressor controller, so that the position number and position of operation frequency of the compressor are determined. Total refrigeration output by the multi-split system can be controlled simply and efficiently and can be reasonably distributed to the rooms by the method, so that the refrigeration for each room matches with heat load of the room.

Description

Technical field [0001] The invention relates to the field of multi-line air-conditioning system control, in particular to a multi-line air-conditioning system and a multi-line air-conditioning system state switching control method. Background technique [0002] Multi-line air-conditioning system is a type of air-conditioning in which one outdoor unit is connected to multiple indoor units, commonly known as "one with multiple". It was born in 1982. Although it has only a development history of more than 20 years, it has been widely used and developed worldwide because of its convenient installation, flexible design, good indoor thermal comfort controllability, and high energy efficiency. For example, in Japan, 50% of medium-sized commercial buildings and one-third of large commercial buildings have adopted multi-connected systems. In China, the total installed capacity of multi-line systems in 2009 has exceeded 30% of the air-conditioning market. In 2010, the multi-line market s...

AI Technical Summary

Problems solved by technology

First, the suction pressure or discharge pressure of the compressor is generally used as a parameter to reflect the total cooling capacity demand, so an additional refrigerant pressure sensor needs to be installed, which not only increases the cost but also increases the possibility of refrigerant leakage

Second, artificially changing the superheat setting of the indoor unit to match the cooling demand of the room means that the superheat of the indoor unit cannot be stabilized at the optimum value, which will lead to a decrease in the efficiency of the evaporator When the heat rises, the exhaust temperature of the compressor is too high, which affects the reliability of the long-term operation of the compressor

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