Multi-online indoor machine wind side bypass content control method and device thereof
A capacity control and multi-connection technology, applied in heating and ventilation control systems, heating methods, space heating and ventilation, etc., can solve problems affecting system safety and energy efficiency, complex pipe network structure and control algorithm, compressor suction port High superheat and other problems, to achieve the effect of good system operation stability, improve system operation stability, and simple control
Active Publication Date: 2010-12-15
TSINGHUA UNIV
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Problems solved by technology
However, under partial load conditions under cooling conditions, the superheat of the compressor suction port may be high, which affects system safety and energy efficiency.
The existing common solution is to add a liquid bypass auxiliary circuit to control the suction superheat of the compressor inlet, but the pipe network structure and control algorithm are relatively complicated
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[0019] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.
[0020] The air side bypass capacity control principle of the multi-connected indoor unit used in the present invention is: when the air volume passing through the heat exchanger in the indoor unit changes, the convective heat transfer coefficient of the corresponding air side and the temperature distribution of the air side will change with the air volume of the heat exchanger. The result of the combined effect of the two can change the heat transfer capacity of the heat exchanger. The control method of the present invention contains two working conditions of refrigeration and heating, and its specific steps are as follows:
[0021] 1) The indoor unit is provided with a fan, a heat exchanger, a side vent, an electric side vent valve on the wind side and an electronic expansion valve.
[0022] 2) Under cooling conditions, the total air volume of the f...
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The invention relates to a multi-online indoor machine wind side bypass content control method and a device thereof. The method comprises the following steps of: (1) mounting a fan, a heat exchanger, a wind side electric bypass air valve and an electronic expansion valve in an indoor machine; (2) under the refrigerating condition, by the opening combination adjustment of the wind side electric bypass air valve and the electronic expansion valve, when a room load is increased, reducing the opening of the wind side electric bypass air valve and increasing the opening of the electronic expansion valve; when the room load is reduced, increasing the opening of the wind side electric bypass air valve and reducing the opening of the electronic expansion valve; (3) under the heating condition, by the opening combination adjustment of the wind side electric bypass air valve and the electronic expansion valve, when the room load is increased, reducing the opening of the wind side electric bypass air valve and increasing the opening of the electronic expansion valve; and when the room load is reduced, increasing the opening of the wind side electric bypass air valve and reducing the opening of the electronic expansion valve. The invention has simple control and higher stability of system running and can be widely applied to various multi-online systems in the field of heating ventilation air conditioners.
Description
technical field [0001] The present invention relates to a control method and device in the field of HVAC, in particular to a method and device for controlling the wind side bypass capacity of a multi-connected indoor unit. Background technique [0002] The multi-connected system adopts variable capacity adjustment to match the system load change, and gradually shows better performance in terms of system energy saving. The independent control and individual adjustment of each indoor unit improves indoor comfort. In recent years, it is causing more and more more and more attention. [0003] In the VRF (VRF, Variable Refrigerant Flow, variable refrigerant flow) system, due to the actual operation process of each indoor unit, the load rate changes differently, and the method of controlling the constant outlet superheat of the traditional unitary system cannot realize the cooling of each indoor unit. To distribute the cooling capacity among them, a new means of control and regul...
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IPC IPC(8): F24F11/02F24F13/00
Inventor 江亿夏建军涂壤
Owner TSINGHUA UNIV