Continuous oil injection loop for testing evaporation/condensation heat transfer characteristic of refrigerant and oil injection method thereof

Abstract

The invention discloses a continuous oil injection loop for testing an evaporation / condensation heat transfer characteristic of a refrigerant and an oil injection method thereof. The continuous oil injection loop and the oil injection method thereof are characterized in that the oil injection loop comprises a high-efficiency oil separator, high-pressure oil pump, a lubricating oil mass flowmeter, a control valve, a uniform mixing groove, a preheater, a refrigerant evaporation / condensation testing segment and a heater, wherein a connecting pipeline of the control valve and the uniform mixing groove is connected with a refrigerant mass flowmeter by a tee; and a refrigeration part is connected between a refrigerant inlet of the refrigerant mass flowmeter and a refrigerant outlet of the high-efficiency oil separator. The injection quantity of the lubricating oil is controlled by regulating the control valve in the lubricating oil loop. Oil content of the refrigerant is obtained by calculating read numbers of the refrigerant mass flowmeter and the lubricating oil mass flowmeter. The dryness of the refrigerant inlet of the refrigerant evaporation / condensation testing segment can be controlled by regulating the heating quantity of the preheater. The total quantity of the lubricating oil in the oil loop can be kept balanced to fulfill the aim of continuously injecting the oil.

Description

technical field [0001] The invention relates to a continuous oil injection circuit for testing refrigerant evaporation / condensation heat transfer characteristics and an oil injection method thereof. Background technique [0002] For the vapor compression refrigeration system, there will inevitably be a certain amount of lubricating oil mixed in the refrigerant, which will affect the evaporation / condensation heat transfer effect of the refrigerant in the heat exchange tube. The effect of heat transfer characteristics is very important. [0003] In order to study the effect of refrigerant oil content on the heat transfer characteristics of heat exchange tubes, it is necessary to inject a certain amount of lubricating oil into the refrigerant evaporation or condensation test circuit. In the prior art, a pusher injector is usually used to inject lubricating oil into the refrigerant evaporation or condensation test circuit. This method has certain defects: non-continuous oil inj...

AI Technical Summary

Problems solved by technology

In the prior art, a pusher injector is usually used to inject lubricating oil into the refrigerant evaporation or condensation test circuit. This method has certain defects: non-continuous oil injection, and each time the oil content of the refrigerant in the system needs to be manually injected into the system The oil content of lubricating oil and refrigerant cannot be continuously adjusted; it takes a certain amount of time to mix the refrigerant and lubricating oil, this method does not provide driving force to accelerate the mixing of the two, and the lubricating oil in the system takes a long time to reach a stable concentration

There are also online continuous oil injection devices in the prior art, such as Chinese Patent No. 200410017184.9, and the title of the invention is "on-line continuous oil injection device for refrigerant flow boiling heat transfer measurement circuit", but the refrigerant circuit of this device uses a vapor compression system, which is theoretically a The compressor can only test one kind of refrigerant, different compressors need to be selected for different refrigerant oil content test experiments, and this device can only perform online continuous oil injection test of the refrigerant flow boiling heat transfer measurement circuit, and cannot carry out condensation of refrigerant oil content test

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