Refrigerant mass and flow measuring method and device and measuring instrument

Abstract

The invention provides a refrigerant mass and flow measuring method and device and a measuring instrument. The method is used in a refrigerating system and comprises the steps that the evaporation pressure and the condensation pressure are obtained; the air suction temperature and the exhaust temperature of a compressor are obtained, and the compressor shell surface temperature, the environment temperature around the compressor and the compressor consumption power are obtained; the jetting temperature of an intermediate pressure container is obtained, and the oil content of a refrigerant mixture is obtained; a corresponding first enthalpy value, a corresponding second enthalpy value, a corresponding third enthalpy value, a corresponding fourth enthalpy value, a corresponding fifth enthalpy value, an enthalpy value difference and the heat exchange amount of the compressor and the outside environment are obtained through calculation according to the obtained various parameters; and according to the first enthalpy value, the second enthalpy value, the third enthalpy value, the fourth enthalpy value, the fifth enthalpy value, the enthalpy value difference, the heat exchange amount, the consumption power of the compressor and the oil content of the refrigerant mixture, the mass and flow of the refrigerant in the refrigerating system are obtained through calculation. According to the scheme, non-intrusive and high-precision measurement on the mass and flow of the refrigerant is achieved, bad influences brought to the refrigerating system in the measurement process are avoided, and the user experience is improved.

Description

technical field [0001] The invention relates to the field of refrigeration system analysis, in particular to a refrigerant mass flow measurement method, device and measuring instrument. Background technique [0002] The refrigeration system is a machine that transfers the heat of a cooled object with a lower temperature to the ambient medium to obtain cold energy. The working medium that participates in the thermodynamic process change (energy conversion and heat transfer) in the refrigeration system is called refrigerant. Refrigeration systems generally consist of compressors, condensers, evaporators, and throttle valves, and some refrigeration systems also include intermediate pressure vessels (such as flashers or intercoolers). With the development of human society, in many occasions, the compressor needs to work under the condition of a large compression ratio, and the traditional single-stage compression technology will cause the exhaust temperature to be too high and t...

AI Technical Summary

Problems solved by technology

Refrigerant mass flow rate is an important parameter to judge whether the refrigeration system is running normally. Currently, the measurement method of refrigerant mass flow rate is obtained by Coriolis mass flow meter, but this method is not suitable for on-site measurement of unit performance. The main reason is that the Coriolis mass flowmeter needs to be welded on the liquid phase pipe at the outlet of the condenser, which will cause damage to the running refrigeration system unit, and the user acceptance is poor

[0004] Therefore, how to overcome the defect that the refrigerant mass flow measurement method in the prior art will destroy the refrigeration system unit has become a technical problem to be solved urgently

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