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Air conditioner compressor frequency control method

A compressor frequency and air-conditioning compressor technology, which is applied in the field of compressor frequency control of air-conditioning and hot water supply combined systems, can solve the problems of water machine fuzzy operation control, energy efficiency waste, compressor operation reliability, etc., and achieve the effect of improving comfort

Inactive Publication Date: 2019-11-15
MITSUBISHI HEAVY IND HAIER QINGDAO AIR CONDITIONERS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to better solve the problems of energy efficiency waste and compressor operation reliability caused by system differences, this invention combines the operation characteristics of the water machine and the fluorine machine, we control the external machine on the basis of the traditional pressure control, and adopt Fuzzy operation control of water machine

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0022]Assuming that the user sets the target temperature T_set to 55°C when the water machine is working, and the first detection of the outlet water temperature T_real of the fluorine water heat exchanger is 48°C, the calculated difference DT between the target temperature and the actual temperature is 7°C; Seconds later, the outlet water temperature T_real of the fluorine water heat exchanger was detected again to be 49°C, and DT was calculated to be 6°C. Then according to the fuzzy rule, the compressor frequency should increase with a time rate of 1Hz / s. In order to achieve the purpose of high efficiency, energy saving and compressor protection.

Embodiment 2

[0024] Assuming that the user sets the target temperature T_set of the water machine to be 55°C, and the first detection of the outlet water temperature T_real of the fluorine water heat exchanger is 54°C, the calculated difference DT between the target temperature and the actual temperature is 1°C; Seconds later, the outlet water temperature T_real of the fluorine water heat exchanger was detected again to be 54.3°C, and DT was calculated to be 0.7°C. Then according to the fuzzy rule, the compressor frequency should remain constant. In order to achieve the purpose of high efficiency, energy saving and compressor protection.

Embodiment 3

[0026] Assuming that the user sets the target temperature T_set when the water machine is working to 55°C, and the first detection of the outlet water temperature T_real of the fluorine water heat exchanger is 55.7°C, the calculated difference DT between the target temperature and the actual temperature is -0.7°C; One second later, the outlet water temperature T_real of the fluorine water heat exchanger was detected again to be 55.8°C, and DT was calculated to be -0.8°C. Then according to the fuzzy rule, the compressor frequency should decrease with a time change rate of 1 Hz / s. In order to achieve the purpose of high efficiency, energy saving and compressor protection.

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Abstract

The invention provides a frequency control method of a compressor of an air conditioner comprising a fluorine machine system and a water machine system. The control method comprises the following steps that after the water machine operates, according to a set target temperature, a detected actual outlet water temperature and the change condition of a difference value of the target temperature andthe detected actual outlet water temperature, the time change rate of the compressor frequency is determined by adopting a fuzzy control rule, and the operation of the compressor is controlled according to the change rate; and a high-pressure intensity value, a low-pressure intensity value and a discharge pipe temperature of the compressor are divided into a plurality of intervals, the time changerate of the compressor frequency is determined according to the corresponding physical quantity numerical value by detecting the high-pressure intensity value, the low-pressure intensity value and the discharge pipe temperature of the compressor, and the operation of the compressor is controlled according to the change rate. By adopting the control method, the frequency of the compressor can be more accurately adjusted, so that the required temperature can be efficiently reached, the energy consumption can be reduced, and the purpose of protecting the compressor can be achieved.

Description

technical field [0001] The invention relates to the technical field of refrigeration and heating control, and in particular designs a method for controlling the frequency of a compressor in an air-conditioning and hot water supply combined system. Background technique [0002] For the frequency control of the compressor of the fluorine machine air conditioner, it is generally controlled according to the high and low pressure of the system target, so as to achieve the purpose of energy saving and high efficiency and protect the compressor at the same time. For the newly developed air source heat pump water machine at present, both the fluorine air conditioner and the heat pump water machine are used in one system. If high and low pressures are still used to control the frequency operation of the fluorine air conditioner and water machine, many problems will occur. question. If the heat pump water machine is controlled by high and low pressure, the frequency and energy effici...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F24F5/00F24F11/61F24F11/64F24F11/86F24H4/02F24H9/20F24F140/10
CPCF24F5/001F24F2221/18F24H4/02F24H9/2007F24F11/61F24F11/64F24F11/86F24F2140/10
Inventor 江锁世范增年相金波
Owner MITSUBISHI HEAVY IND HAIER QINGDAO AIR CONDITIONERS CO LTD
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