Mass and flow measuring method and device of refrigerant in refrigerating system and measuring instrument

Abstract

The invention provides a mass and flow measuring method and a device of a refrigerant in a refrigerating system and a measuring instrument. The method comprises the steps of: obtaining an intake temperature of a first compressor, an exhaust temperature of a second compressor, an evaporation pressure, a condensation pressure, shell surface temperatures of the first and second compressors, a surrounding environment temperature, a total consumption power, a spraying temperature, a first supercooling temperature, a second supercooling temperature and an oil content of a refrigerant mixture; calculating corresponding first, second, third, fourth and fifth enthalpy values, enthalpy value differences and total heat exchange quantities of the first and second compressors with external environment according to the obtained data; and calculating the mass and the flow of the refrigerant in the refrigerating system according to the first, second, third, fourth and fifth enthalpy values, the enthalpy value differences, the total consumption power, the total heat exchange quantities and the oil content of the refrigerant mixture. The method realizes non-invasion and high-precision measurement of the mass and the flow of the refrigerant in the refrigerating system, prevents adverse effect on the refrigerating system in the measuring process, and improves the user experience.

Description

technical field [0001] The invention relates to the field of refrigeration system analysis, in particular to a method, device and measuring instrument for measuring refrigerant mass flow in a refrigeration system. 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 temp...

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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