All-in-on device for evaporation/condensation heat transmission testing in micro pipe and testing method thereof

Abstract

The invention discloses an all-in-one device for evaporation / condensation heat transmission testing in a micro pipe and a testing method thereof. The device comprises a refrigerant circuit and a heat exchange circuit in testing section, wherein the refrigerant circuit comprises a recovery tank, a power pump, a regulating valve, a refrigerant mass flow meter, a regulating testing circuit in parallel composed of a condensation preheating passage and an evaporation preheating passage, a inner pipe in testing section and a condenser; a inlet of the power pump is connected with the recovery tank; an outlet is connected with the refrigerant mass flow meter; the inlet of the regulating testing circuit in parallel is connected with the refrigerant mass flow meter; the outlet of the regulating testing circuit in parallel is connected with the inner pipe in testing section; a refrigerant outlet of the inner pipe in testing pipe is connected with the condenser; and the heat exchange circuit in testing section comprises a outer pipe in testing section and a heat exchanger, a water heater, a water pump and a water mass flow meter in sequent communication. By using the power pump to control the refrigerant flow and using the evaporation preheater / condensation preheater to control the dryness of the refrigerant and using the heat exchange circuit in testing section to control the heat exchange in the testing section, the invention respectively realizes evaporation and condensation heat transmission testing in a micro pipe.

Description

technical field [0001] The invention relates to an integrated device for testing evaporation / condensation heat transfer in a micro-diameter tube and a testing method thereof. Background technique [0002] For heat exchange tubes, it is very important to study their heat transfer and flow performance. In the prior art, a vapor compression refrigeration system is usually used to study the heat transfer and flow performance of the heat exchanger. For example, the patent number is 200410017005.1, and the invention name is "A device for testing the boiling heat transfer characteristics of refrigerant tubes". Refrigerant flow. By adjusting the opening degree of the regulating valve on the oil return pipe connected to the oil reservoir, the bypass air volume of the compressor and the pressure in the test section can be adjusted. Although the heat transfer test of the heat exchanger can be carried out, it has the following disadvantages: [0003] 1. Evaporation / condensation heat...

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Problems solved by technology

[0003] 1. Evaporation / condensation heat transfer test experiments in small pipe diameters cannot be carried out; the flow rate of small pipe diameters is small, it is difficult to match the corresponding compressor, and it is a waste of resources to choose a compressor with a large power

[0004] 2. Different refrigerants need to be equipped with different compressors, the cost is high and the system is complicated

[0005] 3. The test process of the vapor compression refrigeration system has poor stability and low test accuracy

[0006] 4. Only one state can be tested, and the function is single

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