Flow characteristics test method and device of a plate-fin heat exchanger fin

A technology of plate-fin heat exchanger and flow characteristics, which is applied in the field of fluid mechanics and can solve problems such as difficult fin quality judgment

Inactive Publication Date: 2009-09-09
HANGZHOU HANGYANG
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The above-mentioned traditional detection methods rely too much on the experience of

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  • Flow characteristics test method and device of a plate-fin heat exchanger fin
  • Flow characteristics test method and device of a plate-fin heat exchanger fin
  • Flow characteristics test method and device of a plate-fin heat exchanger fin

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[0032] The present invention will be described in detail below with reference to the accompanying drawings: The method for testing the fin flow characteristics of the plate-fin heat exchanger of the present invention is to use a fin flow characteristics test device with computer control and calculation functions to measure air flow in real time. The pressure drop across the fins, the flow rate and the temperature before and after the fins are determined by the following technical formula (1):

[0033] Re = Q × De A × γ - - - ( 1 ) ,

[0034] Among them: Q-air flow, m 3 / s;

[0035] De——Equivalent diameter of the channel, m;

[0036] A——Circulation area, m 2 ;

[0037] γ——Kinematic viscosity, m 2 / s.

[0038] The equivalent diameter De of the...

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Abstract

The invention relates to a flow characteristics test method and a device of a plate-fin heat exchanger fin. The method comprises the following steps: employing the flow characteristics test device of the fin having the functions of computer control and computation to measure the pressure drop and flow of the air when flowing through the fin and the temperature before and behind the fin in real time to obtain the flow characteristic curve of the fin of the friction factor f along with the change relation of the Reynolds number Re; comparing the flow characteristic curve with the standard flow characteristic curve to detect the performance and quality of the fin. The test device comprises a fin die assembly, a high-pressure fan, a temperature sensor, a differential pressure transmitter, an air flowmeter, a pressure sensor, a high-accuracy data acquisition and control plate and a computer software for measurement and control; wherein, the fin die assembly consists of a hydraulic device of an oil pump, a clamp for clamping the fin and an air duct; both ends of the fin die assembly are fixed on a left bracket and a right bracket respectively through a pressure joint and a flexible joint; the temperature sensor is arranged on a connecting line at an air inlet and is finally connected with the high-pressure fan; the air flowmeter, the pressure sensor and an outlet temperature sensor are arranged on the side of an air outlet. The invention has the characteristics of simple test method and device, high accuracy and capability of conveniently detecting the quality and performance of the fin, etc.

Description

Technical field [0001] The invention relates to a method and device for testing the fin flow characteristics of a plate-fin heat exchanger, which belongs to the technical field of fluid mechanics. Background technique [0002] The fin is the basic heat exchange unit in the plate-fin heat exchanger, and its quality directly affects the flow and heat transfer performance of the heat exchanger. At present, the quality inspection of the fins of plate-fin heat exchangers first adopts visual inspection to observe whether there are burrs on the fins? How flat is it? Then use simple tools such as vernier calipers or spiral micrometers to measure the fin height, pitch and other parameters to determine whether the relevant dimensions are within the tolerance range. The above-mentioned traditional detection methods rely too much on the experience of professionals, and it is difficult to make accurate judgments on the quality of the fins. Summary of the invention [0003] The purpose of the...

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Application Information

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IPC IPC(8): G01M9/00G01M9/02G01N33/00
Inventor 王金宏胡亚才毛央平姜周曙强载炎黄国辉
Owner HANGZHOU HANGYANG
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