Multiple-on-line heat pump air-conditioning system and method for controlling multiple-on-line heat pump air-conditioning system

Abstract

The invention discloses a multiple-on-line heat pump air-conditioning system and a method for controlling the multiple-on-line heat pump air-conditioning system. The method is that a confluence unit performs gas-liquid separation and compression to a refrigerant output by the third end of a changing-over unit and outputs the refrigerant to the first end of the changing-over unit; under the working conditions of refrigeration and cooling-free dehumidification, a refrigerant output by the second end of the changing-over unit is driven to flow through a first heat exchange unit, a second electronic expansion valve, a second heat exchanger, a third electronic expansion valve and a third heat exchanger, flows back to the fourth end of the changing-over unit through a first stop valve and then is output out of the third end; under a working condition of heating, a refrigerant output by the fourth end of the changing-over unit is driven to flow through the third heat exchanger, the third electronic expansion valve, the second heat exchanger and the second electronic expansion valve, flows back to the second end of the changing-over unit through a second stop valve and the first heat exchange unit and then is output from the third end. By applying the method, the system cost can be reduced, and the control accuracy of the multiple-on-line heat pump air-conditioning system can be improved.

Description

technical field [0001] The invention relates to a multi-connection air-conditioning control technology, in particular to a multi-connection heat pump air-conditioning system and a method for controlling the multi-connection heat pump air-conditioning system. Background technique [0002] With the continuous improvement of people's living standards, installing air-conditioning systems in living and indoor working environments to improve the comfort of living and working environments has become an important choice for people to improve their comfort needs. Among them, multi-connected heat pump air-conditioning technology is an important direction for the development of central air-conditioning due to its advantages of free control, high efficiency and energy saving, and easy installation and maintenance. [0003] figure 1 It is a structural schematic diagram of the existing multi-connected heat pump air-conditioning system. see figure 1 , the multi-connected heat pump air c...

AI Technical Summary

Problems solved by technology

However, on the one hand, this improved method needs to add an additional reheat heat exchanger to the indoor unit, which increases the system cost; Control accuracy is difficult to guarantee

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