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Multi-connection air conditioning unit and control method thereof during small-load refrigeration running

A multi-connected air conditioner and control method technology, applied in heating and ventilation control systems, heating methods, space heating and ventilation, etc., can solve the problems of inaccurate control methods and needs to be perfected, and achieve simple and reasonable structure and low cost , control simple effects

Active Publication Date: 2011-07-13
GD MIDEA HEATING & VENTILATING EQUIP CO LTD
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

This control method is not accurate enough and needs to be improved

Method used

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  • Multi-connection air conditioning unit and control method thereof during small-load refrigeration running
  • Multi-connection air conditioning unit and control method thereof during small-load refrigeration running
  • Multi-connection air conditioning unit and control method thereof during small-load refrigeration running

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Embodiment Construction

[0020] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0021] see figure 1 , the multi-connected air conditioner unit includes a compressor (not shown in the figure) and more than two outdoor heat exchangers, each outdoor heat exchanger is connected to the compressor respectively, and each outdoor heat exchanger is equipped with an outdoor The fan; the air outlet of the compressor is provided with an outdoor high-pressure pressure sensor 6 for detecting the pressure of the air-conditioning system. Each outdoor fan is a fan with adjustable speed.

[0022] The multi-connected air conditioner unit is equipped with an outdoor heat exchanger A1 and an outdoor heat exchanger B2, and the two outdoor heat exchangers are respectively equipped with an outdoor fan A3 and an outdoor fan B4; the outdoor heat exchanger A1 is directly connected to the exhaust port of the compressor; The outdoor heat exchanger B2 is conn...

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Abstract

The invention relates to a multi-connection air conditioning unit and a control method thereof during small-load refrigeration running. The multi-connection air conditioning unit comprises a compressor and more than two outdoor heat exchangers, wherein all the outdoor heat exchangers are respectively connected with the compressor and respectively provided with an outdoor fan; and the exhaust portof the compressor is provided with an outdoor high-pressure sensor for detecting the pressure of the air conditioning system. The control method comprises the following steps of: (1) judging the current environment temperature and selecting air gears N of the outdoor fans; (2) judging whether the load Q of the air conditioning system is larger than a set range or not; (3) judging whether the pressure of the air conditioning system is in a set range or not; and (4) running the outdoor fans. The invention can effectively control the capacity output of the outdoor unit and enables the air conditioner to normally run during small-load refrigeration or low-temperature small-load refrigeration; and through the precise control to a pressure system, the system can work in an optimal pressure state at different environmental temperatures so as to improve the efficacy of the system under partial load and guarantee the reliable running of the system.

Description

technical field [0001] The invention relates to a multi-connected air-conditioning unit, in particular to a multi-connected air-conditioning unit and a control method of the multi-connected air-conditioning unit and its small-load cooling operation. Background technique [0002] In today's refrigeration and air-conditioning industry, there are currently two types of variable-capacity multi-connected air conditioners: variable-frequency multi-connected air conditioners and digital multi-connected air conditioners. For inverter multi-connected air conditioners, in order to ensure the safe and reliable operation of the compressor, the operating frequency of the inverter compressor has a reasonable range, generally the lowest frequency is above 30Hz. When the system load is small, especially in low-temperature refrigeration conditions, the outdoor environment is particularly low, and the capacity output by the compressor at the lowest operating frequency is much greater than the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F24F11/02F24F11/00
Inventor 李宏伟许永锋梁伯启李洪生冯伟
Owner GD MIDEA HEATING & VENTILATING EQUIP CO LTD
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