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Superheat degree control method and system for refrigeration circulation system

A technology of superheat control and circulation system, which is applied in the directions of temperature control, refrigeration and liquefaction, control/regulation system, etc., and can solve problems such as not being able to avoid the loss of energy efficiency ratio well

Active Publication Date: 2012-01-11
HAIER GRP CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, because this method still needs to preset the fixed value of superheat as the optimal superheat, it still cannot avoid the loss of energy efficiency ratio caused by the error between the actual superheat and the optimal superheat.

Method used

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  • Superheat degree control method and system for refrigeration circulation system
  • Superheat degree control method and system for refrigeration circulation system
  • Superheat degree control method and system for refrigeration circulation system

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Embodiment Construction

[0045] Embodiments of applying the present invention to refrigeration will be described in detail below with reference to the accompanying drawings.

[0046] image 3 The structure diagram of the refrigeration cycle system. A temperature sensor 11 is installed at the inlet of the variable capacity compressor 1 . Temperature sensors 21, 22 and 23 are installed at the inlet, middle and outlet of the evaporator 2, respectively. The throttling mechanism 3 is an electronic expansion valve, which adopts a proportional or PI control method and sets an appropriate control coefficient, so that the degree of superheat SH can be adjusted by adjusting the opening degree of the electronic expansion valve. In this embodiment, the degree of superheat is obtained by the following formula:

[0047] SH=T0-(0.2*T1+0.5*T2+0.3*T3)

[0048] Among them, T0 is the suction temperature of the compressor, T1 is the inlet temperature of the evaporator, T2 is the middle temperature of the evaporator, an...

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Abstract

The invention discloses a superheat degree control method for a refrigeration circulation system, which comprises the following steps of: (A) regulating a superheat degree one preset level forward along a preset direction after starting the refrigeration circulation system for a certain time; (B) judging whether a regulated energy efficiency ratio is higher than that before being regulated, executing a step (C) if yes and executing a step (D) if no; (C) regulating the superheat degree one preset level forward along the preset direction and returning to the step (B) after a certain time; and (D) regulating the superheat degree one preset level forward an inverse direction of the preset direction and returning to the step (B) after a certain time. The invention also correspondingly providesa superheat degree control system for the refrigeration circulation system, which comprises a preset regulating module, an energy efficiency ratio judging module, a positive regulating module and a reverse regulating module. The superheat degree control method and the superheat degree control system can better avoid the energy efficiency ratio loss caused by an error between a preset superheat degree fixed value and an optimum superheat degree and also can better avoid the energy efficiency ratio loss caused by an error between an actual superheat degree and a detected superheat degree.

Description

technical field [0001] The invention relates to the technical field of a refrigeration cycle system, in particular to a method and a system for controlling the superheat of the refrigeration cycle system. Background technique [0002] The refrigeration cycle system usually includes four major components: compressor, evaporator, condenser and throttling mechanism. The throttling mechanism has the function of controlling the superheat degree of the refrigerant at the outlet of the evaporator. like figure 1 As shown, a pressure sensor P and a temperature sensor T are set at the outlet of the evaporator, and the saturation temperature value is obtained by using the saturation temperature relationship corresponding to the pressure value measured by the pressure sensor P, and the saturation temperature value is the temperature value measured by the temperature sensor T. The difference is the superheat value. or as in figure 2 As shown, temperature sensors T1 and T2 are respec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B19/04F25B49/02G05D23/00
Inventor 王瑞生相金波王东参赵慧敏刘俊明秦鸿亮
Owner HAIER GRP CORP
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