Evaporation/condensation heat transfer test integrated device and test method in micro-diameter tube

Abstract

The invention discloses an integrated device for testing evaporation / condensation heat transfer in a micro-diameter tube and a testing method thereof. The device includes a refrigerant circuit and a test section heat exchange circuit; the refrigerant circuit includes a recovery tank, a power pump, a regulating valve, a refrigerant mass flow meter, a parallel regulation test circuit composed of a condensation preheating path and an evaporation preheating path, and a test section Inner pipe and condenser; the inlet of the power pump is connected to the recovery tank, and its outlet is connected to the refrigerant mass flowmeter; the inlet of the parallel regulation test circuit is connected to the refrigerant mass flowmeter, and its outlet is connected to the inner pipe of the test section; The refrigerant outlet of the tube is connected to the condenser; the test section heat exchange circuit includes the test section outer tube and sequentially connected heat exchanger, water heater, water pump, and water mass flowmeter. Control the flow of refrigerant through the power pump, control the dryness of the refrigerant through the evaporation preheater / condensation preheater, and control the heat transfer amount of the test section through the heat exchange circuit of the test section to realize evaporation and condensation in small pipe diameters respectively. Heat transfer test.

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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