Multi-union variable frequency air conditioner based on micro-channel heat exchanger and control method thereof

A micro-channel heat exchanger, multi-connected air conditioner technology, applied in heating and ventilation control systems, heating methods, household heating and other directions, can solve the problems of poor safety and reliability, insufficient cooling capacity, etc., to protect safety, reduce compression ratio, the effect of reducing charge and cost

Active Publication Date: 2014-05-21
QINGDAO HISENSE HITACHI AIR CONDITIONING SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a control method for a frequency conversion multi-connected air conditioner based on a microchannel heat exchanger,

Method used

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  • Multi-union variable frequency air conditioner based on micro-channel heat exchanger and control method thereof
  • Multi-union variable frequency air conditioner based on micro-channel heat exchanger and control method thereof
  • Multi-union variable frequency air conditioner based on micro-channel heat exchanger and control method thereof

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specific Embodiment 1

[0062] below for figure 1 , figure 2 The shown frequency conversion multi-connected air conditioner with micro-channel heat exchanger takes the refrigerant as R410A as an example to illustrate the control method of the present invention.

[0063] like image 3 As shown, the air conditioning system compression ratio protection control method is: system compression ratio β =Pd / Ps, where Pd is the exhaust pressure detected by the high-pressure pressure sensor 10, and Ps is the suction pressure detected by the low-pressure pressure sensor 11;

[0064] when β When <2.2, the system enters the frequency forced increase control mode, and controls the compressor to increase the frequency at a speed of 0.3Hz / s;

[0065] When 2.2≤ β When <2.5, the system enters the control mode of prohibiting frequency reduction, and controls the frequency of the compressor to remain unchanged or increase to prevent further reduction of the compression ratio;

[0066] When 2.5≤ β When <7.5, the s...

specific Embodiment 2

[0082] In this embodiment, the control method of the present invention is described by taking the refrigerant as R22 as an example.

[0083] The compression ratio protection control method of the air conditioning system is: the system compression ratio β =Pd / Ps, where Pd is the exhaust pressure detected by the high-pressure pressure sensor 10, and Ps is the suction pressure detected by the low-pressure pressure sensor 11;

[0084] when β When <1.9, the system enters the frequency forced increase control mode, and controls the compressor to increase the frequency at a speed of 0.25Hz / s;

[0085] When 1.9≤ β When <2.3, the system enters the control mode of prohibiting frequency reduction, and controls the frequency of the compressor to remain unchanged or increase to prevent further reduction of the compression ratio;

[0086] When 2.3≤ β When <7.0, the system enters the normal control mode, and the compressor frequency is automatically adjusted according to the system load;...

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Abstract

The invention relates to a multi-union variable frequency air conditioner based on a micro-channel heat exchanger and a control method thereof. Optimizing control is carried out on the compression ratio and discharge pressure of a compressor of the multi-union variable frequency air conditioner, and operation security and operation reliability of an air-conditioning system are improved. When the air-conditioning system is applied on high-temperature occasions or long piping occasions of scorching heat areas, on one hand, effective security features and long-term reliability of the system under wide load operation conditions are guaranteed, and meanwhile the refrigerant charge and the refrigerant cost are reduced; on the other hand, the system can obtain high refrigerating capacity and a proper refrigerant supercooling degree, and therefore user demands and application requirements are met.

Description

technical field [0001] The invention belongs to the technical field of frequency conversion multi-connection air conditioners, in particular, relates to a frequency conversion multi-connection air conditioner using a micro-channel heat exchanger and a control method thereof. Background technique [0002] Inverter multi-split air conditioner is a kind of complex refrigeration system with complex structure, huge system, internal parameter coupling, and various boundary conditions. Due to its advantages of free control, high efficiency and energy saving, and easy installation and maintenance, it is an important direction for the development of central air conditioning. [0003] Copper tube-fin heat exchangers are mainly used as condensers or evaporators in existing multi-line systems. With the increase of copper price, the cost of multi-line products will also increase. The all-aluminum microchannel heat exchanger has the advantages of high heat transfer efficiency, small...

Claims

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Application Information

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IPC IPC(8): F24F11/00
Inventor 刘敏杜永顾晓宇耿延凯
Owner QINGDAO HISENSE HITACHI AIR CONDITIONING SYST
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