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Method for controlling overheat degree of thermodynamic reverse circulation system through variable refrigerant flow

A technology of superheat control and circulation system, which is applied in the direction of refrigerators, refrigeration components, refrigeration and liquefaction, etc., can solve the problem of time lag in the adjustment of evaporator superheat, and achieve the promotion of wide application, wide application, and easy Adjustment effect

Inactive Publication Date: 2017-06-13
深圳市冰润冷链科技有限公司
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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for controlling the superheat of a thermodynamic reverse cycle system with variable capacity regulation, aiming to solve the problem that the existing thermodynamic reverse cycle system has a time lag in the adjustment of the superheat of the evaporator

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  • Method for controlling overheat degree of thermodynamic reverse circulation system through variable refrigerant flow
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  • Method for controlling overheat degree of thermodynamic reverse circulation system through variable refrigerant flow

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[0032] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0033] Such as Figure 1 ~ Figure 2 Shown is the preferred embodiment provided by the present invention.

[0034] Such as figure 1 with figure 2 As shown, the variable capacity adjustment thermodynamic reverse cycle system superheat control method provided in this embodiment has the following steps:

[0035] Step S101: In each collection cycle, collect the actual superheat value T of the evaporator, and make a difference with the superheat set value T0 of the evaporator to obtain the superheat difference e, e=T-T0; The difference between the current acquisition period e1 and the previous acqui...

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Abstract

The invention relates to the technical field of overheat degree control of thermodynamic reverse circulation systems and provides a method for controlling overheat degree of a thermodynamic reverse circulation system through variable refrigerant flow. The method includes the steps of collecting an actual overheat degree value T in every collecting cycle and subtracting the actual overheat degree value T from a set overheat degree value T0 to obtain an overheat degree difference value e; subtracting a current collecting cycle e1 from a previous collecting cycle e0 and dividing an collecting cycle t by a difference value to obtain a variation rate de / dt; collecting a compressor rotation speed n and subtracting a compressor rotation speed n1 of the current collecting cycle e1 from a compressor rotation speed n0 of the previous collecting cycle e0 so as to obtain a variation value deltan of the compressor rotation speed; selecting a proportion coefficient Kp, an integration coefficient Ki and a differential coefficient Kd according to the overheat degree difference value e and the variation rate de / dt; computing an opening value by inputting the selected coefficients into a PID controller; acquiring an corrected opening value based on the variation value deltan of the compressor rotation speed; adding the opening value and the corrected opening value to obtain an actual opening value. By the method, the problem that existing systems have time lag in overheat degree control is solved.

Description

technical field [0001] The invention belongs to the technical field of superheat degree control of a thermodynamic reverse cycle system, and in particular relates to a method for controlling the superheat degree of a thermodynamic reverse cycle system with variable capacity regulation. Background technique [0002] In today's society, the thermodynamic reverse cycle system has been widely used in all aspects of life and production, and its efficient and stable operation is very important. The superheat degree of the evaporator of the thermodynamic reverse cycle system is an important parameter that needs to be controlled: if the superheat is too high, there will be more superheated steam in the evaporator, occupying a large effective heat area, reducing the heat exchange efficiency of the evaporator, and increasing the compressor capacity. If the suction pressure is too high, the discharge pressure will be too high, which will affect its service life; if the superheat is too...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25B49/02
CPCF25B49/02F25B2700/171F25B2700/2117
Inventor 黄国锋王超苏梦蓉
Owner 深圳市冰润冷链科技有限公司
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