CN107702935A - A kind of condensed water discharging performance test experimental bed of micro-channel evaporator - Google Patents

Abstract

The invention discloses a condensed water discharge performance test bench for a micro-channel evaporator, which includes a compressor, and the refrigerant outlet at the right end of the compressor communicates with the refrigerant inlet at the left end of the condenser through an oil separator; The refrigerant outlet at the right end of the condenser communicates with the refrigerant inlet at the right end of a thermal expansion valve through a mass flow meter and a solenoid valve in turn; the refrigerant outlet at the left end of the thermal expansion valve communicates with a microchannel evaporation The refrigerant inlet at the lower right end of the compressor is connected; the refrigerant outlet at the upper right end of the micro-channel evaporator is connected with the refrigerant inlet at the left end of the compressor through a second shut-off valve; the micro-channel evaporator is located in a hollow, sealed air duct) inside. The invention can effectively detect the condensed water discharge performance of the micro-channel evaporator, reliably grasp the heat transfer performance of the micro-channel evaporator, and has great practical significance in production.

Description

Condensate discharge performance test bench for a microchannel evaporator

technical field

The invention relates to the technical field of refrigeration, in particular to a condensed water discharge performance test bench for a microchannel evaporator.

Background technique

At present, microchannel heat exchangers have been widely used as condensers, and have the advantages of low overall cost, high efficiency, energy saving, and space saving. The problem is that when the surface temperature of the fins it has is lower than the inlet air dew point temperature of the micro-channel evaporator, condensed water will be generated on the fins. At the same time, since the fins of the micro-channel heat exchanger are mostly louver fins, Its structure is easily blocked by water droplets, resulting in poor discharge capacity of condensed water, and the surface condensation of the micro-channel evaporator will seriously affect the heat transfer effect of the micro-channel evaporator, which will easily cause the heat transfer performance of the micro-channel evaporator to be greatly reduced. reduce.

For the micro-channel evaporator, if the condensed water generated on it can be effectively discharged, the air on the air side of the micro-channel evaporator can be unobstructed, so that the heat can be effectively transferred to the heat exchanger tube in the micro-channel evaporator. The refrigerant is used for heat exchange, which can improve the heat exchange performance. Since the discharge of condensed water in microchannel evaporators is directly related to its heat transfer performance, how to effectively discharge condensed water, as well as the improvement effect of condensed water discharge rate and heat exchanger performance are worthy of further study. At present, the establishment of a performance test bench that facilitates the discharge of condensed water from the micro-channel evaporator is of great significance for guiding the installation and use of the micro-channel evaporator.

However, there is no device at present, which can effectively detect the condensed water discharge performance of the micro-channel evaporator, so as to reliably grasp the heat transfer performance of the micro-channel evaporator.

Contents of the invention

In view of this, the purpose of the present invention is to provide a condensed water discharge performance test bench of a micro-channel evaporator, which can effectively detect the condensed water discharge performance of the micro-channel evaporator, thereby reliably mastering the performance of the micro-channel evaporator. Excellent heat transfer performance is conducive to a wide range of popularization and application, and has great practical significance in production.

For this reason, the present invention provides a condensed water discharge performance test bench for a microchannel evaporator, comprising a compressor, the refrigerant outlet at the right end of the compressor communicates with the refrigerant inlet at the left end of the condenser through an oil separator ;

The refrigerant outlet at the right end of the condenser communicates with the refrigerant inlet at the right end of a thermal expansion valve through a mass flow meter and a solenoid valve in turn;

The refrigerant outlet at the left end of the thermal expansion valve communicates with the refrigerant inlet at the lower right end of a microchannel evaporator through a first stop valve;

The refrigerant outlet at the upper right end of the microchannel evaporator communicates with the refrigerant inlet at the left end of the compressor through a second stop valve;

The microchannel evaporator is located in a hollow and sealed air duct.

Wherein, the thermal expansion valve includes a superheat temperature sensing bulb, and the superheat temperature sensing bulb is installed at the connection between the refrigerant outlet of the microchannel evaporator and the refrigerant inlet at the left end of the second shut-off valve. on the pipeline.

Wherein, a humidifier, an air cooler, an electric heater and a fan are sequentially arranged at intervals from top to bottom directly above the microchannel evaporator;

The humidifier, air cooler, electric heater and blower are respectively connected to the same temperature and humidity control regulator through signal lines.

Wherein, a temperature sensor and a first pressure sensor are arranged on the connecting pipeline between the refrigerant outlet at the right end of the compressor and the refrigerant inlet at the left end of the oil separator;

A mass flow meter is arranged on the connecting pipeline between the refrigerant outlet at the right end of the condenser and the refrigerant inlet at the left end of the solenoid valve;

The connecting pipeline between the refrigerant inlet at the right end of the first cut-off valve and the refrigerant outlet at the left end of the thermal expansion valve is also provided with a temperature sensor and a first pressure sensor;

The connecting pipeline between the refrigerant outlet at the left end of the second shut-off valve and the refrigerant inlet at the left end of the compressor is also provided with a temperature sensor and a first pressure sensor;

The upper and lower sides of the microchannel evaporator are respectively provided with a second pressure sensor, an anemometer and a temperature and humidity sensor;

The second pressure sensor, anemometer and temperature and humidity sensor are located inside the air duct.

Wherein, the anemometer and the temperature and humidity sensor in the air duct are respectively connected to the temperature and humidity control regulator through signal lines.

Wherein, a water receiving tray is also provided directly below the microchannel evaporator, and the water receiving tray is located inside the air duct;

The center of the bottom of the water receiving tray communicates with a water bucket through a drain pipe;

The tub sits on top of an electronic scale.

Wherein, the compressor, the oil separator, the condenser, the mass flow meter, the solenoid valve, the thermal expansion valve, the first shut-off valve and the second shut-off valve are all located outside the air duct.

Wherein, the microchannel evaporator is located in an integral bracket, and an angle adjustment handle is welded at the left and right ends of the overall bracket, and each angle adjustment handle runs through the center of the air duct and a dial in turn. Through holes, the dial is pre-engraved with a plurality of equally spaced and arc-shaped distribution of angle score lines.

Wherein, each of the dials is also connected to an air duct fixed connection plate through a hollow connecting pipe, and the air duct fixed connection plate is fixedly connected to the air duct;

Each hollow connecting pipe communicates with the central through hole of the dial, and each angle adjustment handle also passes through one of the connecting pipes and the air duct fixing connecting plate correspondingly, and then connects with the integral bracket.

Wherein, the outer surface of the dial is also provided with an arc-shaped distribution of bolt fixing holes, the bolt fixing holes correspond to the pre-engraved angle lines on the dial, and the bolt fixing holes The slot is used to insert the bolt detent.

It can be seen from the technical solution provided by the present invention above that, compared with the prior art, the present invention provides a condensate discharge performance test bench for a microchannel evaporator, which can effectively test the condensate discharge performance of a microchannel evaporator. The detection is carried out so as to reliably grasp the heat transfer performance of the microchannel evaporator, which is conducive to wide popularization and application, and has great practical significance in production.

Description of drawings

Fig. 1 is the structural representation of the condensed water discharge performance test bench of a kind of microchannel evaporator provided by the present invention;

Fig. 2 is the front view of an embodiment of the connection structure between the microchannel evaporator and the integral support, the angle adjustment handle and the dial in the condensate discharge performance test bench of a microchannel evaporator provided by the present invention;

Fig. 3 is a left view of an embodiment of the connection structure between the microchannel evaporator and the integral support, the angle adjustment handle and the dial in the condensate discharge performance test bench of a microchannel evaporator provided by the present invention;

Fig. 4 is a top view of an embodiment of the connection structure between the microchannel evaporator, the angle adjustment handle and the dial in the condensate discharge performance test bench of a microchannel evaporator provided by the present invention;

Fig. 5 is an implementation of the connection structure between the overall support for installing the microchannel evaporator, the angle adjustment handle, the dial and the air duct fixed connection plate in the condensate discharge performance test bench of a microchannel evaporator provided by the present invention Schematic diagram of an example;

In the figure, 1 is the compressor, 2 is the oil separator, 3 is the condenser, 4 is the mass flow meter, 5 is the solenoid valve, 6 is the thermal expansion valve, 71 is the first stop valve, 72 is the second stop valve, 8 is a microchannel evaporator, 9 is a humidifier, and 10 is an air cooler;

11 is an electric heater, 12 is a fan, 13 is a water tray, 14 is a bucket, 15 is an electronic scale, 16 is an air duct, 17 is a temperature and humidity control regulator, 18 is an angle adjustment handle, 19 is a temperature sensor, 201 is the first pressure sensor, 202 is the second pressure sensor;

21 is an anemometer, 22 is a temperature and humidity sensor, and 23 is a drainage pipe;

180 is a dial, 181 is a connecting pipe, 182 is a fixed connection plate for the air duct, 183 is a bolt fixing hole, and 184 is a bolt bayonet.

detailed description

In order to enable those skilled in the art to better understand the solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

Referring to Fig. 1, the present invention provides a condensed water discharge performance test bench of a microchannel evaporator, comprising a compressor 1, the refrigerant outlet at the right end of the compressor 1 passes through an oil separator 2 and the left end of the condenser 3 The refrigerant inlet is connected (through the pipeline);

The refrigerant outlet at the right end of the condenser 3 communicates with the refrigerant inlet at the right end of a thermal expansion valve 6 through a mass flow meter 4 and a solenoid valve 5 (through a pipeline);

The refrigerant outlet at the left end of the thermal expansion valve 6 communicates with the refrigerant inlet at the lower right end of a microchannel evaporator 8 through a first stop valve 71;

The refrigerant outlet at the upper right end of the microchannel evaporator 8 communicates with the refrigerant inlet at the left end of the compressor 1 through a second stop valve 72;

The microchannel evaporator 8 is located in a hollow and sealed air channel 16 .

In the present invention, referring to Fig. 1 for specific implementation, the thermal expansion valve 6 includes a superheat temperature-sensing bulb, and the superheat-degree temperature-sensing bulb is installed between the refrigerant outlet of the microchannel evaporator 8 and the On the connecting pipeline between the refrigerant inlets at the left end of the second stop valve 72 .

It should be noted that the superheat temperature sensor bulb is one of the important components of the thermal expansion valve, which is used to detect the temperature of the refrigerant outlet of the microchannel evaporator 8, and convert the temperature information into pressure information and then transmit it to the thermal expansion valve. The valve body of the valve plays a role in regulating the flow of refrigerant flowing into the micro-channel evaporator 8 .

It should also be noted that, for the present invention, the compressor 1 compresses the low-pressure refrigerant gas from the microchannel evaporator 8 into a high-pressure refrigerant gas, and then the high-pressure refrigerant gas continues to be introduced into the oil separator 2 In the oil separator 2, the lubricating oil carried in the high-pressure refrigerant gas is separated, and then the high-pressure refrigerant gas continues to enter the condenser 3. In the condenser 3, the refrigerant transfers its own heat to the outside, and the refrigerant gas It is cooled to a high-pressure refrigerant liquid, and then throttled into a low-pressure gas-liquid two-phase fluid through the solenoid valve 5 and thermal expansion valve 6. The refrigerant continues to enter the micro-channel evaporator 8, where it absorbs the external The heat is evaporated into a low-pressure refrigerant gas, and finally the role of the evaporator is well played to achieve the effect of refrigeration.

In addition, the mass flow meter 4 is used to measure the flow rate of the liquid refrigerant in the pipeline connected to the refrigerant outlet of the condenser 3 (the flow rate is the mass flow rate of the liquid refrigerant flowing through the cross section of the pipeline per unit time).

In addition, the first shut-off valve 71 and the second shut-off valve 72 are respectively used to prevent refrigerant leakage by closing the first shut-off valve 71 and the second shut-off valve 72 when replacing different micro-channel evaporators 8 .

In the present invention, referring to FIG. 1 , a humidifier 9 , an air cooler 10 , an electric heater 11 and a blower 12 are arranged at intervals directly above the microchannel evaporator 8 from top to bottom.

It should be noted that the humidifier 9 can realize isothermal humidification and is used for humidifying the air in the air duct 16. Specifically, the humidifier 9 can be a dry steam humidifier;

The air cooler 10 can be used to lower the temperature of the air in the air duct 16. Specifically, the air cooler 10 can be a surface cooler connected to a constant temperature water tank;

The electric heater 11 can realize iso-humid heating, and is used to heat the air in the air duct 16. Specifically, the electric heater 11 can be a tubular electric heater;

The fan 12 is a fan equipped with a frequency converter, and the fan 12 can change the power supply frequency of the fan through the frequency converter, thereby changing the air volume formed by the fan. In specific implementation, the fan 12 can be a model of DKT12-45 The outer rotor double-inlet air-conditioning fan is equipped with a frequency converter.

Therefore, in the present invention, through the interaction of the humidifier 9, the air cooler 10, the electric heater 11 and the fan 12, the air inlet parameters in the air duct 16, such as air temperature, humidity, air volume, etc., can be adjusted, Therefore, the heat transfer performance of the micro-channel evaporator 8 under different inlet air parameter conditions can be tested.

The humidifier 9, the air cooler 10, the electric heater 11 and the fan 12 are respectively connected to the same temperature and humidity control regulator 17 through signal lines.

A temperature sensor 19 and a first pressure sensor 201 are arranged on the connecting pipeline between the refrigerant outlet at the right end of the compressor 1 and the refrigerant inlet at the left end of the oil separator 2;

A mass flow meter 4 is arranged on the connecting pipeline between the refrigerant outlet at the right end of the condenser 3 and the refrigerant inlet at the left end of the solenoid valve 5;

A temperature sensor 19 and a first pressure sensor 201 are also arranged on the connecting pipeline between the refrigerant inlet at the right end of the first stop valve 71 and the refrigerant outlet at the left end of the thermal expansion valve 6;

A temperature sensor 19 and a first pressure sensor 201 are also arranged on the connecting pipeline between the refrigerant outlet at the left end of the second stop valve 72 and the refrigerant inlet at the left end of the compressor 1;

The upper and lower sides of the microchannel evaporator 8 are respectively provided with a second pressure sensor 201, an anemometer 21 and a temperature and humidity sensor 22;

The second pressure sensor 202 , the anemometer 21 and the temperature and humidity sensor 22 are located inside the air duct 16 .

An anemometer 21 and a temperature and humidity sensor 22 in the air duct 16 are respectively connected to the temperature and humidity control regulator 17 through signal lines.

It should be noted that the temperature and humidity control regulator 17 is used for correspondingly controlling the humidifier 9, the air cooler 10, the electric heater 11 and the fan according to the control instruction input by the user and according to the control instruction input by the user. 12 specific operations.

In terms of specific implementation, the temperature and humidity control regulator 17 can be any temperature and humidity controller that can measure and control temperature signals and humidity signals, for example, it can be a model TH produced by Shenzhen Xinkongrui Automation Technology Co., Ltd. -808 temperature and humidity controller.

It should be noted that the control command input by the user may be any control command input by the user for the humidifier 9 , the air cooler 10 , the electric heater 11 and the fan 12 . For example, it can be the opening or closing control command to the humidifier 9 (also can be the air cooler 10, the electric heater 11 or the fan 12), and the humidifier 9 (also can be the air cooler 10, the electric heater 11 or The driving power of the fan 12) increases or decreases as a control instruction.

It should also be noted that the temperature sensor 19 is used to detect the temperature of the refrigerant circulating in the installed pipeline.

The first pressure sensor 201 and the second pressure sensor 202, wherein, the first pressure sensor 201 is located outside the air duct 16 and is respectively located at the inlet and outlet ends of the microchannel evaporator 8 (that is, the refrigerant inlet port and the refrigerant inlet port). agent outlet port), used to transmit the pressure signal of the refrigerant in the installed pipeline, and the second pressure sensor 202 is located inside the air duct 16, and is used to measure the pressure signals of the upper and lower sides of the microchannel evaporator 8 ;

The two anemometers 21 are located in the air duct 16 and are used to measure the wind speeds on the upper and lower sides of the microchannel evaporator 8 respectively, and then send them to the temperature and humidity control regulator 17;

The two temperature and humidity sensors 22 are located in the air duct 16 and are respectively used to measure the temperature and humidity of the air on the upper and lower sides of the micro-channel evaporator 8 and then send them to the temperature and humidity control regulator 17 .

In the present invention, referring to Fig. 1 for specific implementation, a water receiving tray 13 is also provided directly below the microchannel evaporator 8, and the water receiving tray 13 is located inside the air duct 16;

The center of the bottom of the water receiving tray 13 communicates with a water tub 14 through a drain pipe 23 .

The bucket 14 is located on top of an electronic scale 15 . Therefore, the mass of the condensed water can be obtained by weighing the mass of the water tub 14 when it is empty and weighing the mass of the water tub 14 filled with condensed water by the electronic scale 15 .

In the present invention, referring to Fig. 1, the compressor 1, the oil separator 2, the condenser 3, the mass flow meter 4, the electromagnetic valve 5, the thermal expansion valve 6, the first cut-off valve 71, the second The stop valves 72 are all located outside the air duct 16 .

Referring to Fig. 1, Fig. 2, shown in Fig. 3 and Fig. 4, described microchannel evaporator 8 is positioned in an integral support 80 (that is, the outside of described microchannel evaporator 8 has an integral support 80), and described integral support The left and right ends of 80 are respectively welded with an angle adjustment handle 18, and each angle adjustment handle 18 runs through the central through hole of the air duct 16 and a dial 180 in turn, and the dial 180 is pre-engraved with multiple Angle reticle lines that are equally spaced and distributed in an arc shape (for example, the interval angle between two adjacent angle reticle lines corresponds to a rotation angle of 10 degrees). Therefore, by rotating the two angle adjustment handles 18 to the front or rear of the microchannel evaporator 8 at the same time, the microchannel evaporator 8 can be tilted forward or backward at the same time. Rotate the angle of the microchannel evaporator 8 forward or backward, that is, the inclination angle between the microchannel evaporator 8 and the cross section of the air duct 16, that is to say, the dial 180 is used to record the distance between the microchannel evaporator 8 and the cross section of the air duct 16. The angle of inclination between the cross-sections of the air duct 16 , which is located outside the air duct 16 .

For the present invention, referring to Fig. 5 together, in order to firmly and reliably fix and support the dial 180, so that the angle adjustment handle 18 can rotate the microchannel evaporator 8 better, more stably and reliably, in specific implementation, each The dial 180 is also connected to an air duct fixed connection plate 182 through a hollow connecting pipe 181, and the air duct fixed connection plate 182 is fixedly connected to the air duct 16;

Each hollow connecting pipe 181 communicates with the central through hole of the dial 180 (that is, correspondingly arranged), each of the angle adjustment handles 18 also correspondingly passes through one of the connecting pipes 181 and the air duct fixing connecting plate 182 The integral brackets 80 are connected.

In terms of specific implementation, the outer surface of the dial 180 is also provided with an arc-shaped distribution of bolt fixing holes 183, and the bolt fixing holes 183 are set corresponding to the pre-engraved angle marks on the dial 180, The bolt fixing hole 183 is used to insert the bolt bayonet 184, so that the bolt bayonet 184 is fixed on the dial 180, because each of the dial 180 is fixed to the air duct 182 through the connecting pipe 181 and the air duct fixed connection plate 182 is fixedly connected with the air duct 16. Therefore, it can also be said that through the fixing effect between the dial 180 and the bolt bayonet pin 184, the angle adjustment handle 18 and its The connected integral support 80 is fixed, and then the position of the microchannel evaporator 8 arranged in the integral support 80 is fixed, and finally the microchannel evaporator 8 and the cross section of the air duct 16 can be controlled to maintain a preset inclination angle Down.

It should be noted that, through the angle adjustment handle 18 , the inclination angle of the micro-channel evaporator and the air duct can be adjusted, and the inclination angle of the micro-channel evaporator 8 can be accurately read on the dial 180 .

Based on the above technical solutions, it can be seen that compared with the prior art, the condensed water discharge performance test bench of a micro-channel evaporator provided by the present invention can effectively detect the condensed water discharge performance of the micro-channel evaporator, Therefore, the heat transfer performance of the microchannel evaporator can be reliably grasped. Specifically, the following performance parameters can be measured:

1. It can change the inclination angle between the micro-channel evaporator and the air duct to speed up the discharge of condensed water. Therefore, the condensate discharge performance test bench of the microchannel evaporator can test the relationship between the tilt angle of the evaporator and the discharge of condensate;

It should be noted that when the humidity of the inlet air in the air duct increases, the condensed water on the surface of the micro-channel evaporator increases. Rotate the angle adjustment handle 18 to record the rotation angle displayed on the dial, thereby adjusting the cross-section of the micro-channel evaporator and the air duct. The condensed water is discharged from the flat tube of the micro-channel evaporator by using the air velocity and the gravity of the condensed water, and the condensed water falls to the water receiving tray 13, and then flows into the bucket through the drain pipe 23 at the bottom of the water receiving tray 13. 14 As for the electronic scale 15, the quality of the condensed water can be read over time, and the change law between the displacement of the condensed water of the micro-channel evaporator and the inclination angle of the micro-channel evaporator can be obtained.

2. It can test the relationship between the inclination angle of the evaporator and the heat transfer performance of the evaporator;

It should also be noted that when the air humidity at the inlet in the air duct increases, the condensed water on the surface of the microchannel heat exchanger increases, and the angle adjustment handle 18 is rotated to record the rotation angle displayed on the dial; The refrigerant temperature and pressure gauges (i.e. temperature sensor and first pressure sensor) installed on the outlet pipeline can obtain the enthalpy difference between the inlet and outlet refrigerants, and the unit mass of the microchannel evaporator can be calculated according to the enthalpy difference between the inlet and outlet of the refrigerant Then measure the mass flow rate of the refrigerant in the tube according to the flow meter 4. The product of the mass flow rate and the enthalpy difference is the total heat transfer rate of the evaporator. From this, the inclination angle of the microchannel evaporator and the heat transfer rate of the evaporator can be obtained. The law of change between them. When the inclination angle of the micro-channel evaporator is changed to increase the inclination angle, the condensed water can be quickly discharged, and the heat transfer on the air side can be improved, so that the heat transfer capacity of the micro-channel evaporator can be increased.

3. It is possible to test the relationship between the condensed water discharge of the evaporator and the improvement of the heat transfer performance of the evaporator.

For the present invention, when the inlet air humidity in the air duct increases, the condensed water on the surface of the microchannel evaporator increases, and the angle adjustment handle 18 is rotated to adjust the inclination angle between the microchannel heat exchanger and the cross section of the air duct. Gravity discharges the condensed water from the flat tube of the micro-channel evaporator, the condensed water falls to the water receiving tray 13, and then flows into the bucket through the drain pipe 23 at the bottom of the water receiving tray, and the water bucket 14 is placed on the electronic scale 15, which can be measured over time The quality of the condensed water discharged by the microchannel evaporator; through the refrigerant temperature and pressure gauges (i.e. temperature sensor and first pressure sensor) installed on the inlet and outlet pipelines of the microchannel evaporator 8, the enthalpy difference between the inlet and outlet refrigerants is obtained, The heat transfer per unit mass of the evaporator can be calculated according to the enthalpy difference between the inlet and outlet of the refrigerant, and then the mass flow rate of the refrigerant in the tube is measured according to the flowmeter 4. The product of the mass flow rate and the enthalpy difference is the total heat transfer amount of the evaporator , to obtain the law between the condensate displacement and the heat transfer performance of the evaporator.

It should also be noted that, at present, for each refrigerant, there is a corresponding, existing known refrigerant thermophysical property chart, in which the temperature value and pressure value of each type of refrigerant are recorded And the correspondence between specific enthalpy values (specifically, one-to-one correspondence). Therefore, for the present invention, the pressure value of the refrigerant at the inlet and outlet ends of the microchannel evaporator 8 can be measured respectively by measuring the two first pressure sensors 201 respectively located at the inlet and outlet ends of the microchannel evaporator 8, and can be respectively located at the microchannel evaporator 8. Two temperature sensors 19 on the inlet and outlet ends of the evaporator 8 measure and obtain the refrigerant temperature value at the inlet and outlet ends of the microchannel evaporator 8 respectively. Therefore, according to the specific type of refrigerant used in the present invention, and according to the refrigerant The pressure value and temperature value at the inlet and outlet ends of the microchannel evaporator 8 can be directly obtained from the thermophysical properties chart of the refrigerant to obtain the specific enthalpy values corresponding to the refrigerants at the inlet and outlet ends of the microchannel evaporator 8 (that is, the refrigerant content per unit mass Calorific value) H ₁ and H ₂ , then, according to the formula for calculating the heat transfer of the micro-channel evaporator 8 , calculate the heat transfer of the micro-channel evaporator 8 . The specific formula of the heat transfer Q of the microchannel evaporator 8 is as follows:

Q=m*( _{H2 -} H1);

Wherein, Q represents heat transfer, and m represents the refrigerant mass flow rate flowing through the microchannel evaporator 8 per unit time (specifically: the refrigerant flowing through the microchannel evaporator 8 per unit time can be measured by the mass flow meter 4 The mass flow rate of the cross-section of the pipeline connected to the inlet is equal to the mass flow rate m) of the refrigerant flowing through the microchannel evaporator 8 per unit time, H1 is the specific enthalpy of the refrigerant at the inlet end _of the microchannel evaporator 8, _H2 is the specific enthalpy of the refrigerant at the outlet end of the microchannel evaporator 8 .

In summary, compared with the prior art, the condensed water discharge performance test bench of a micro-channel evaporator provided by the present invention can effectively detect the condensed water discharge performance of the micro-channel evaporator, thereby reliably Accurately mastering the heat transfer performance of the microchannel evaporator is conducive to wide application and has great practical significance in production.

The above is only a preferred embodiment of the present invention, it should be pointed out that, for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications can also be made. It should be regarded as the protection scope of the present invention.

Claims (10)

1. a condensed water discharge performance test bench of a microchannel evaporator is characterized in that it comprises a compressor (1), and the refrigerant outlet at the right end of the compressor (1) passes through an oil separator (2) and condensing The refrigerant inlet at the left end of the device (3) is connected; The refrigerant outlet at the right end of the condenser (3) communicates with the refrigerant inlet at the right end of a thermal expansion valve (6) through a mass flow meter (4) and a solenoid valve (5) in sequence; The refrigerant outlet at the left end of the thermal expansion valve (6) communicates with the refrigerant inlet at the lower right end of a microchannel evaporator (8) through a first stop valve (71); The refrigerant outlet at the upper right end of the microchannel evaporator (8) communicates with the refrigerant inlet at the left end of the compressor (1) through a second stop valve (72); The microchannel evaporator (8) is located in a hollow and sealed air duct (16). 2. the condensed water discharge performance test bench of microchannel evaporator as claimed in claim 1, is characterized in that, described thermal expansion valve (6) comprises superheat degree temperature-sensitive package, and described superheat degree temperature-sensitive package is installed On the connecting pipeline between the refrigerant outlet of the micro-channel evaporator (8) and the refrigerant inlet at the left end of the second stop valve (72). 3. the condensed water discharge performance test bench of microchannel evaporator as claimed in claim 1, is characterized in that, just above described microchannel evaporator (8) is provided with humidifier (9) at intervals from top to bottom successively ), air cooler (10), electric heater (11) and fan (12); The humidifier (9), air cooler (10), electric heater (11) and blower fan (12) are also respectively connected to the same temperature and humidity control regulator (17) through signal lines. 4. the condensed water discharge performance test bench of microchannel evaporator as claimed in claim 3 is characterized in that, the refrigerant outlet on the right end of the compressor (1) is connected to the refrigerant outlet on the left end of the oil separator (2). A temperature sensor (19) and a first pressure sensor (201) are arranged on the connecting pipeline between the agent inlets; A mass flow meter (4) is arranged on the connecting pipeline between the refrigerant outlet at the right end of the condenser (3) and the refrigerant inlet at the left end of the solenoid valve (5); The connecting pipeline between the refrigerant inlet at the right end of the first cut-off valve (71) and the refrigerant outlet at the left end of the thermal expansion valve (6) is also provided with a temperature sensor (19) and a first a pressure sensor (201); The connecting pipeline between the refrigerant outlet at the left end of the second stop valve (72) and the refrigerant inlet at the left end of the compressor (1) is also provided with a temperature sensor (19) and a first pressure sensor (201); The upper and lower sides of the microchannel evaporator (8) are respectively provided with a second pressure sensor (201, an anemometer (21) and a temperature and humidity sensor (22); The second pressure sensor (202), anemometer (21) and temperature and humidity sensor (22) are located inside the air duct (16). 5. the condensed water discharge performance test bench of microchannel evaporator as claimed in claim 4, is characterized in that, the anemometer (21) and the temperature and humidity sensor (22) in the described air channel (16) pass through respectively The signal line is connected with the temperature and humidity control regulator (17). 6. as any one of claim 1 to 5 the condensed water discharge performance test bench of microchannel evaporator, is characterized in that, just below described microchannel evaporator (8) also is provided with a water receiving A tray (13), the water receiving tray (13) is located inside the air duct (16); The bottom center of the water receiving tray (13) communicates with a water bucket (14) through a drain pipe (23); The bucket (14) is located on top of an electronic scale (15). 7. as any one of claim 1 to 5 the condensed water discharge performance test bench of microchannel evaporator, is characterized in that, described compressor (1), oil separator (2), condenser ( 3), mass flow meter (4), solenoid valve (5), thermal expansion valve (6), first stop valve (71), second stop valve (72) are all located outside the air duct (16). 8. as any one of claim 1 to 5 the condensed water discharge performance test bench of microchannel evaporator, it is characterized in that, described microchannel evaporator (8) is positioned at an integral support (80), An angle adjustment handle (18) is respectively welded at the left and right ends of the integral bracket (80), and each angle adjustment handle (18) passes through the air duct (16) and a dial (180) in turn. A central through hole, the dial (180) is pre-engraved with a plurality of equally spaced, arc-shaped distribution of the angle score line. 9. the condensed water discharge performance test bench of microchannel evaporator as claimed in claim 8, is characterized in that, each described dial (180) is also fixed with an air duct by a hollow connecting pipe (181) The connection plate (182) is connected, and the air duct fixed connection plate (182) is fixedly connected with the air duct (16); Each hollow connection pipe (181) communicates with the central through hole of the dial (180), and each angle adjustment handle (18) also passes through one of the connection pipes (181) and the air duct fixing connection plate (182) is connected with described integral support (80) afterward. 10. the condensed water discharge performance test bench of microchannel evaporator as claimed in claim 8, is characterized in that, the outer surface of described dial (180) is also provided with the bolt fixing hole groove ( 183), the bolt fixing hole (183) is set corresponding to the pre-engraved angle line on the dial (180), and the bolt fixing hole (183) is used for inserting the bolt bayonet (184).