Non-azeotropic refrigerant charge determining method

A method for determining refrigerants, which is applied to refrigerants, refrigerators, refrigeration components, etc., can solve the problem of inaccurate charging of non-azeotropic refrigerants, and achieve the effect of ensuring operability

Inactive Publication Date: 2017-04-19
NANJING NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Technical problem: The present invention provides a non-azeotropic refrigerant charge that can solve the problem of inaccurate zeotropic refrigerant charge, accurately calibrate the range of refrigerant charge in refrigeration equipment, and improve the performance of the unit. determination method

Method used

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  • Non-azeotropic refrigerant charge determining method

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specific Embodiment 1

[0053] Specific embodiment 1, the present invention has carried out the charging test of refrigerant R404A under the working condition of 32°C, and the results are analyzed as follows. Such as figure 2 As shown, the changes of cooling capacity, input power and energy efficiency ratio under different refrigerant charges were analyzed. It can be seen from the figure that the input power first increases and then remains basically unchanged with the increase of refrigerant charge; while the cooling capacity and energy efficiency ratio both increase first and then decrease with the increase of refrigerant charge. The maximum cooling capacity and the maximum energy efficiency ratio of the refrigerant corresponding to the system in this patent are not under the same charge. The dotted lines in the figure represent the maximum energy efficiency ratio and the maximum cooling capacity respectively. It can be seen that the charging amount corresponding to the maximum energy efficiency ...

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Abstract

The invention discloses a non-azeotropic refrigerant charge determining method. The non-azeotropic refrigerant charge determining method comprises the following three steps of (1) estimating the refrigerant charge; (2) according to the environment characteristic of regions with hot summer and cold winter, selecting at least four working situations for refrigerant charging and performance testing from high temperature to low temperature based on the estimated value in the step (1), injecting refrigerants of different masses to a test unit, and testing the refrigerating capacity, the energy efficiency ratio, the input power and the like through an enthalpy potential method; and (3) carrying out contrastive analysis on experiment results of the selected working situations and finally obtaining the range of the optimal refrigerant charge during whole-year operation. Through estimation, testing and contrastive analysis of the refrigerant charge, the non-azeotropic refrigerant charge can be determined accurately, performance of the unit is improved, and compared with a traditional method of briefly estimating the refrigerant charge, precision is higher, and the performance of the unit is better.

Description

technical field [0001] The invention belongs to the technical field of building environment and equipment engineering, and relates to a method for determining the charging amount of non-azeotropic refrigerant. Background technique [0002] Compression condensing units are widely used in the refrigeration and refrigeration industry, and the matching terminal devices are even more diverse. Due to the different matching units, this type of unit does not specify the refrigerant charge when it leaves the factory, but according to the refrigeration side unit. According to the style and installation situation, the installer usually estimates the refrigerant charge amount by observing the state of the refrigerant in the sight glass based on experience, and evaluates the pros and cons of the entire system based on the cooling capacity, energy efficiency ratio, input power, etc. of the system. As an evaluation standard, it will bring problems such as insufficient refrigerant charge or...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25B45/00
CPCF25B45/00F25B2345/001F25B2345/007
Inventor 王高伟张忠斌
Owner NANJING NORMAL UNIVERSITY
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