阅读说明：本技术 一种可切换的蒸发和冷凝的单管管内换热实验装置 (Switchable evaporation and condensation single-tube heat exchange experimental device ) 是由 谢晶 常婉莹 王金锋 安振东 王雪松 郑明涛 于 2019-10-23 设计创作，主要内容包括：本发明涉及一种可切换的蒸发和冷凝的单管管内换热实验装置。包括制冷剂循环系统,水循环系统和实时数据采集控制系统；水循环系统包括蒸发处理循环回路,预冷处理循环回路,实验段水循环回路,冷凝处理循环回路和过冷处理循环回路；实时数据采集控制系统包括手动控制系统,触摸屏系统,PLC系统和电脑LabVIEW软件系统。本发明既可以进行单管管内蒸发换热实验,也可以进行单管管内冷凝换热实验；同时可实现对电子膨胀阀开度,实验段制冷剂的压力、温度,水泵的运转频率等参数的独立调节。(The invention relates to a single-tube-in-tube heat exchange experimental device capable of switching evaporation and condensation. The system comprises a refrigerant circulating system, a water circulating system and a real-time data acquisition control system; the water circulation system comprises an evaporation treatment circulation loop, a precooling treatment circulation loop, an experimental section water circulation loop, a condensation treatment circulation loop and a supercooling treatment circulation loop; the real-time data acquisition control system comprises a manual control system, a touch screen system, a PLC system and a computer LabVIEW software system. The invention can carry out the evaporation heat exchange experiment in the single tube, and can also carry out the condensation heat exchange experiment in the single tube; meanwhile, the opening of the electronic expansion valve, the pressure and the temperature of the refrigerant in the experimental section, the running frequency of the water pump and other parameters can be independently adjusted.)

1. The utility model provides a heat transfer experimental apparatus in single tube of changeable evaporation and condensation which characterized in that includes: the system comprises a refrigerant circulating system, a water circulating system and a real-time data acquisition control system;

the refrigerant cycle system includes: the device comprises a liquid storage tank (1), a drying filter (2), a subcooler (3), a diaphragm metering pump (B4), a pulsation damper (4), a second plate heat exchanger (HE 2), an experimental section (5) and a third plate heat exchanger (HE 3), wherein heat exchange in the second plate heat exchanger (HE 2) is heat exchange between a refrigerant and water, and heat exchange in the third plate heat exchanger (HE 3) is heat exchange between the refrigerant and water;

the water circulation system comprises an evaporation treatment circulation loop, a precooling treatment circulation loop, an experimental section water circulation loop, a condensation treatment circulation loop and a supercooling treatment circulation loop;

the evaporation treatment circulation circuit includes: the system comprises a second plate heat exchanger (HE 2), a fifth electromagnetic flowmeter (G5), a front end electric heater (H2), an expansion water tank (E) and a front end water pump (B2);

the pre-cooling treatment circulation loop comprises: the system comprises a second plate heat exchanger (HE 2), a fifth electromagnetic flowmeter (G5), a glycol low-temperature water tank (6), a Y-shaped filter (7) and a low-temperature circulating water pump (B3);

the experimental section water circulation loop comprises: the method comprises the following steps of (1) an experimental section (5), testing electric heating (H1), a first plate heat exchanger (HE 1) and a testing water pump (B1), wherein heat exchange in the first plate heat exchanger (HE 1) is heat exchange between water and water;

the condensate treatment circulation loop comprises: the system comprises a third plate heat exchanger (HE 3), a glycol low-temperature water tank (6), a Y-shaped filter (7), a low-temperature circulating water pump (B3) and a fourth electromagnetic flowmeter (G4);

the supercooling circulating circuit includes: the system comprises a subcooler (3), a glycol low-temperature water tank (6), a Y-shaped filter (7) and a low-temperature circulating water pump (B3);

the real-time data acquisition control system comprises: the system comprises a manual control system, a touch screen system, a PLC system and a computer LabVIEW software system;

the manual control system consists of a PID control system, an electronic expansion valve control system and a frequency converter control system;

the PID control system is composed of a refrigerant flow PID controller (U1), an experimental section (5) water flow PID controller (U2), a third plate heat exchanger (HE 3) water flow PID controller (U3), an experimental section (5) water inlet temperature PID controller (U4), an experimental section (5) front refrigerant temperature PID controller (U5), an ethylene glycol low-temperature water tank (6) water outlet temperature PID controller (U6), a liquid reservoir (1) condensation pressure PID controller (U7) and an experimental section (5) outlet pressure PID controller (U8);

the electronic expansion valve control system consists of a first electronic expansion valve (EXV 1) controller (X1) and a second electronic expansion valve (EXV 2) controller (X2);

the frequency converter control system consists of a diaphragm metering pump (B4), a frequency converter (F1), a test water pump (B1), a frequency converter (F2) and a front-end water pump (B2), wherein the frequency converter (F3).

2. The experimental apparatus for single tube-in-tube heat exchange of switchable evaporation and condensation according to claim 1, wherein:

when the experimental device for the heat exchange in the single pipe capable of switching evaporation and condensation is used for carrying out evaporation heat exchange experiments,

the pre-cooling treatment circulation loop, the experiment section water circulation loop, the condensation treatment circulation loop and the supercooling treatment circulation loop operate;

in the experiment section water circulation loop, closing a seventeenth ball valve (VW 17), a seventh ball valve (VW 7), an eighth ball valve (VW 8-1) and a gate valve (VW 8-2);

the evaporation treatment circulation circuit is closed by closing the first ball valve (VW 1), the second ball valve (VW 2) and the fourth ball valve (VW 4).

3. The experimental apparatus for single tube-in-tube heat exchange of switchable evaporation and condensation according to claim 1, wherein:

when the single-tube-in-tube heat exchange experimental device capable of switching evaporation and condensation is used for carrying out condensation heat exchange experiments,

the evaporation treatment circulation loop and the experimental section water circulation loop operate;

the experiment section water circulation loop closes a fifth ball valve (VW 5) and a sixth ball valve (VW 6);

closing the pre-cooling treatment circulation loop by closing the third ball valve (VW 3) and the fourteenth ball valve (VW 14);

closing the condensation treatment circulation loop by closing the ninth ball valve (VW 9) and the twelfth ball valve (VW 12);

the subcooling process circulation loop is closed by closing the tenth ball valve (VW 10) and the eleventh ball valve (VW 11).

4. The experimental apparatus for single tube-in-tube heat exchange of switchable evaporation and condensation according to claim 1, wherein:

in the evaporation treatment circulation loop, the front end electric heating (H2) controls the heat value provided for the second plate heat exchanger (HE 2);

a front-end water pump (B2) provides circulating power for the evaporation treatment circulating loop;

in the experiment section water circulation loop, when an evaporation heat exchange experiment is carried out, test electric heating (H1) provides heat for the experiment section (5), and a test water pump (B1) provides power for the experiment section water circulation loop;

when a condensation heat exchange experiment is carried out, the first plate heat exchanger (HE 1) provides cold for the experiment section (5).

5. The experimental apparatus for single tube-in-tube heat exchange of switchable evaporation and condensation according to claim 1, wherein:

in the refrigerant circulating system, a bypass loop provided with an electric regulating valve (M1) is connected from an accumulator (1) to an outlet of a diaphragm metering pump (B4).

6. The experimental apparatus for single tube-in-tube heat exchange of switchable evaporation and condensation according to claim 1, wherein:

and a release valve (VR 14) is arranged above the experimental section (5), and the vertical distance between the release valve (VR 14) and the experimental section (5) is 30-50 cm.

7. The experimental apparatus for single tube-in-tube heat exchange of switchable evaporation and condensation according to claim 1, wherein:

the data acquisition line and the equipment control line of the equipment (11) are both connected to the PLC system consisting of PLC hardware (8);

part of data acquisition lines and device control lines of the device (11) are connected to the manual control system;

the touch screen system is communicated with the PLC system through an RS485 communication line;

and the computer LabVIEW software system is communicated with the PLC system through a PLC wireless module.

8. The manual control system of claim 1, wherein:

the device is characterized in that direct control of the device (11) is achieved through a refrigerant flow PID controller (U1), an experimental section (5) water flow PID controller (U2), a third plate heat exchanger (HE 3) water flow PID controller (U3), an experimental section (5) water inlet temperature PID controller (U4), an experimental section (5) front refrigerant temperature PID controller (U5), a glycol low-temperature water tank (6) water outlet temperature PID controller (U6), a liquid storage device (1) condensation pressure PID controller (U7), an experimental section (5) outlet pressure PID controller (U8), a first electronic expansion valve (EXV 1) controller (X1), a second electronic expansion valve (EXV 2) controller (X2), a diaphragm metering pump (B4) frequency converter (F1), a test water pump (B1) frequency converter (F2), and a front-end water pump (B2) frequency converter (F3).

9. The experimental apparatus for single tube-in-tube heat exchange of switchable evaporation and condensation according to claim 1, wherein:

direct control of the device (11) is achieved by means of a PLC control system.

10. The experimental apparatus for single tube-in-tube heat exchange of switchable evaporation and condensation according to claim 1, wherein:

and a first needle valve (P5-1), a second needle valve (P5-2), a third needle valve (P5-3), a fourth needle valve (P5-4) and a fifth needle valve (P5-5) are sequentially reserved on the refrigerant circulating loop.

Technical Field

The invention relates to an evaporation and condensation heat exchange experimental device, in particular to a single-tube heat exchange experimental device capable of switching evaporation and condensation.

Background

The experimental apparatus that only can satisfy evaporation or the single heat transfer characteristic of condensation is adopted in the research of current single tube heat transfer experiment more, and the experimental apparatus operating mode control range that only can satisfy evaporation or the single heat transfer characteristic of condensation is less, and the rerum natura parameter of the refrigerant of research also comparatively single, if evaporation heat transfer experiment and condensation heat transfer experiment all go on, both enlarged area, improved the cost again.

Disclosure of Invention

The invention aims to provide a single-tube-in-tube heat exchange experimental device capable of switching evaporation and condensation, which can measure different tube types and tube diameters; the evaporation heat exchange experiment in a single-tube can be carried out, the condensation heat exchange experiment in the single-tube can also be carried out, and the evaporation pressure of the refrigerant can be controlled; the evaporation temperature and the condensation temperature can be controlled.

In order to achieve the purpose, the technical scheme of the invention is as follows:

a switchable evaporation and condensation single-tube-in-tube heat exchange experimental device comprises: the system comprises a refrigerant circulating system, a water circulating system and a real-time data acquisition control system; the refrigerant cycle system includes: the device comprises a liquid storage tank 1, a drying filter 2, a subcooler 3, a diaphragm metering pump B4, a pulsation damper 4, a second plate heat exchanger HE2, an experimental section 5 and a third plate heat exchanger HE3, wherein heat exchange in the second plate heat exchanger HE2 is heat exchange between a refrigerant and water, and heat exchange in the third plate heat exchanger HE3 is heat exchange between the refrigerant and the water.

The water circulation system comprises an evaporation treatment circulation loop, a precooling treatment circulation loop, an experimental section water circulation loop, a condensation treatment circulation loop and a supercooling treatment circulation loop; the evaporation treatment circulation circuit includes: the system comprises a second plate heat exchanger HE2, a fifth electromagnetic flowmeter G5, a front end electric heating H2, an expansion water tank E and a front end water pump B2; the pre-cooling treatment circulation loop comprises: the system comprises a second plate heat exchanger HE2, a fifth electromagnetic flowmeter G5, a glycol low-temperature water tank 6, a Y-shaped filter 7 and a low-temperature circulating water pump B3; the experiment section water circulation loop includes: the experimental section 5, the test electric heating H1, the first plate heat exchanger HE1 and the test water pump B1, wherein the heat exchange in the first plate heat exchanger HE1 is the heat exchange between water and water; the condensation treatment circulation loop comprises: the system comprises a third plate heat exchanger HE3, an ethylene glycol low-temperature water tank 6, a Y-shaped filter 7, a low-temperature circulating water pump B3 and a fourth electromagnetic flowmeter G4; the supercooling circulating circuit includes: the system comprises a subcooler 3, an ethylene glycol low-temperature water tank 6, a Y-shaped filter 7 and a low-temperature circulating water pump B3.

The real-time data acquisition control system includes: the system comprises a manual control system, a touch screen system, a PLC system and a computer LabVIEW software system; the manual control system consists of a PID control system, an electronic expansion valve control system and a frequency converter control system; the PID control system consists of a refrigerant flow PID controller U1, an experimental section 5 water flow PID controller U2, a third plate heat exchanger HE3 water flow PID controller U3, an experimental section 5 water inlet temperature PID controller U4, an experimental section 5 front refrigerant temperature PID controller U5, an ethylene glycol low-temperature water tank 6 water outlet temperature PID controller U6, a liquid reservoir 1 condensation pressure PID controller U7 and an experimental section 5 outlet pressure PID controller U8; the electronic expansion valve control system consists of a first electronic expansion valve EXV1 controller X1 and a second electronic expansion valve EXV2 controller X2; the frequency converter control system consists of a diaphragm metering pump B4 frequency converter F1, a test water pump B1 frequency converter F2 and a front end water pump B2 frequency converter F3.

When an evaporation and condensation single-tube-in-tube heat exchange experimental device capable of switching evaporation and condensation is used for carrying out an evaporation and heat exchange experiment, a precooling treatment circulating loop, an experimental section water circulating loop, a condensation treatment circulating loop and a supercooling treatment circulating loop operate; in the experiment section water circulation loop, closing a seventeenth ball valve VW17, a seventh ball valve VW7, an eighth ball valve VW8-1 and a gate valve VW 8-2; the evaporation treatment circulation circuit is closed by closing the first ball valve VW1, the second ball valve VW2 and the fourth ball valve VW 4.

When a single-tube-in-tube heat exchange experimental device capable of switching evaporation and condensation is used for carrying out condensation heat exchange experiments, an evaporation treatment circulation loop and an experimental section water circulation loop operate; the experiment section water circulation loop closes the fifth ball valve VW5 and the sixth ball valve VW 6; closing the pre-cooling treatment circulation loop by closing the third ball valve VW3 and the fourteenth ball valve VW 14; closing the condensation treatment circulation loop by closing the ninth ball valve VW9 and the twelfth ball valve VW 12; the subcooling treatment circulation circuit is closed by closing the tenth ball valve VW10 and the eleventh ball valve VW 11.

In the evaporation treatment circulation loop, the front-end electric heating H2 controls the heat value provided for the second plate heat exchanger HE 2; the front-end water pump B2 provides circulating power for the evaporation treatment circulating loop; in the experiment section water circulation loop, when an evaporation heat exchange experiment is carried out, the test electric heating H1 provides heat for the experiment section 5, and the test water pump B1 provides power for the experiment section water circulation loop; when a condensation heat exchange experiment is carried out, the first plate heat exchanger HE1 provides cold for the experiment section 5.

In the refrigerant circulating system, a bypass loop provided with an electric control valve M1 is connected from the liquid storage device 1 to the outlet of the diaphragm metering pump B4, when the flow of refrigerant is too small, the flow of refrigerant at the outlet of the diaphragm metering pump B4 is unstable, and the flow of refrigerant is unstable, the electric control valve M1 is opened to improve the flow of refrigerant, so that the refrigerant with large flow rate is shunted after passing through the diaphragm metering pump B4, part of refrigerant flows back to the liquid storage device 1, the flow of refrigerant at the outlet of the diaphragm metering pump B4 can be ensured to be stable, more stable flow measurement is realized, and the guarantee is.

The upper part of the experimental section 5 is provided with a gas release valve VR14, the gas release valve VR14 is 30-50cm away from the vertical distance of the experimental section 5, non-condensable gas generated in a condensation heat exchange experiment and non-condensable gas generated by overlong running time of an experimental device are removed, the experimental process is not influenced by the non-condensable gas, and the accuracy of experimental data is ensured.

The data acquisition line and the equipment control line of the equipment 11 are both connected to a PLC system formed by PLC hardware 8; part of data acquisition lines and device control lines of the device 11 are connected to a manual control system; the touch screen system realizes communication with the PLC system through an RS485 communication line; and the computer LabVIEW software system realizes communication with the PLC system through the PLC wireless module.

The direct control of the device 11 is realized through a refrigerant flow PID controller U1, an experimental section 5 water flow PID controller U2, a third plate heat exchanger HE3 water flow PID controller U3, an experimental section 5 water inlet temperature PID controller U4, an experimental section 5 front refrigerant temperature PID controller U5, an ethylene glycol low-temperature water tank 6 water outlet temperature PID controller U6, a liquid reservoir 1 condensation pressure PID controller U7, an experimental section 5 outlet pressure PID controller U8, a first electronic expansion valve EXV1 controller X1, a second electronic expansion valve EXV2 controller X2, a diaphragm metering pump B4 frequency converter F1, a test water pump B1 frequency converter F2 and a front end water pump B2 frequency converter F3.

Direct control of the device 11 is achieved by a PLC control system.

The values of the fourth pressure sensor P4 and the fifteenth platinum resistor T15 are observed through a real-time data acquisition control system, and the corresponding output adjustment is carried out, so that the refrigerant flowing out of the subcooler in a subcooled state is ensured to be in a full liquid state when passing through the first liquid sight glass S1.

A first needle valve P5-1, a second needle valve P5-2, a third needle valve P5-3, a fourth needle valve P5-4 and a fifth needle valve P5-5 are sequentially reserved on a refrigerant circulating loop, pressure measurement, leak detection and refrigerant filling are carried out on a switchable evaporation and condensation single-tube-in-tube heat exchange experimental device, and normal operation and experimental accuracy and reasonableness of the switchable evaporation and condensation single-tube-in-tube heat exchange experimental device are guaranteed.

The invention has the beneficial effects that: the invention can carry out the evaporation heat exchange experiment in the single tube, and can also carry out the condensation heat exchange experiment in the single tube; the opening of the electronic expansion valve, the pressure and the temperature of the refrigerant at the experimental section, the running frequency of the water pump and other parameters are independently adjusted; not only reducing the occupied area, but also reducing the cost.

Drawings

FIG. 1 is a schematic diagram of the system of the present invention, in which 1-a liquid reservoir, 2-a dry filter, 3-a subcooler, 4-a pulsation damper, 5-an experimental section, 6-a glycol low-temperature water tank, a C-water chiller, a 7-Y filter, an E-expansion water tank, HE 1-a first plate heat exchanger, HE 2-a second plate heat exchanger, HE 3-a third plate heat exchanger, EXV 1-a first electronic expansion valve, EXV 2-a second electronic expansion valve, S1-a first sight glass, S2-a second sight glass, S3-a third sight glass, S4-a fourth sight glass, H1-a test electric heater, H2-a front end electric heater, H3-an electric heater, B1-a test water pump, B2-a front end water pump, B3-a low-temperature circulating water pump are shown in the figure, b4-diaphragm metering pump, P1-first pressure sensor, P2-second pressure sensor, P3-third pressure sensor, P4-fourth pressure sensor,. DELTA.P 1-first differential pressure sensor,. DELTA.P 2-second differential pressure sensor, G1-first electromagnetic flowmeter, G2-second electromagnetic flowmeter, G3-third electromagnetic flowmeter, G4-fourth electromagnetic flowmeter, G5-fifth electromagnetic flowmeter, T1-first platinum resistor, T2-second platinum resistor, T3-third platinum resistor, T4-fourth platinum resistor, T5-fifth platinum resistor, T6-sixth platinum resistor, T7-seventh platinum resistor, T8-eighth platinum resistor, T9-ninth platinum resistor, T10-tenth platinum resistor, T11-eleventh platinum resistor, T12-twelfth platinum resistor, t13-thirteenth platinum resistor, T14-fourteenth platinum resistor, T15-fifteenth platinum resistor, VW 1-first ball valve, VW 2-second ball valve, VW 3-third ball valve, VW 4-fourth ball valve, VW 5-fifth ball valve, VW 6-sixth ball valve, VW 7-seventh ball valve, VW 8-1-eighth ball valve, VW 9-ninth ball valve, VW 10-tenth ball valve, VW 11-eleventh ball valve, VW 12-twelfth ball valve, VW 13-thirteenth ball valve, VW 14-fourteenth ball valve, VW 15-fifteenth ball valve, VW 16-sixteenth ball valve, VW 17-seventeenth ball valve, VW 8-2-gate valve, VR 1-first stop valve, VR 1-second stop valve, VR 1-third stop valve, VR 1-fourth stop valve, VR 1-fifth stop valve, VR 6-sixth stop valve, VR 7-seventh stop valve, VR 8-eighth stop valve, VR 9-ninth stop valve, VR 10-tenth stop valve, VR 11-eleventh stop valve, VR 12-twelfth stop valve, VR 13-reservoir safety valve, VR 14-vent valve, P5-1-first needle valve, P5-2-second needle valve, P5-3-third needle valve, P5-4-fourth needle valve, P5-5-fifth needle valve, M1-electric control valve.

FIG. 2 is a connection diagram of a real-time data acquisition control system of the invention, wherein the connection diagram includes 8-PLC hardware, 9-computer, 10-touch screen, 11-device, F1-diaphragm metering pump B4 pump frequency converter, F2-test water pump B1 frequency converter, F3-front water pump B2 frequency converter, X1-first electronic expansion valve EXV1 controller, X2-second electronic expansion valve EXV2 controller, U1-refrigerant flow PID controller, U2-experiment section 5 water flow PID controller, U3-third plate heat exchanger HE3 water flow PID controller, U4-experiment section 5 water inlet temperature PID controller, U5-experiment section 5 front refrigerant temperature PID controller, U6-glycol low-temperature water tank 6 water outlet temperature PID controller, U7-reservoir 1 condensation pressure PID controller, and U8-experiment section 5 outlet pressure PID controller.

FIG. 3 is a diagram of a power cabinet front panel device, in which an F1-diaphragm metering pump B4 pump frequency converter, an F2-test water pump B1 frequency converter, an F3-front water pump B2 frequency converter, a U1-refrigerant flow PID controller, a U2-experiment section 5 water flow PID controller, a U3-third plate heat exchanger HE3 water flow PID controller, a U4-experiment section 5 water inlet temperature PID controller, a U5-experiment section 5 front refrigerant temperature PID controller, a U6-ethylene glycol low-temperature water tank 6 water outlet temperature PID controller, a U7-reservoir 1 condensation pressure PID controller, a U8-experiment section 5 outlet pressure PID controller, a 10-touch screen, an SB 1-system start, an SB 2-system stop, an SB 3-emergency stop, an SB 4-abnormal alarm, an SB 5-alarm, and an SB 6-alarm reset.

Detailed Description

The following describes the method of using the present invention in detail by taking specific embodiments as examples with reference to the accompanying drawings.

As shown in the attached figure 1, the principle diagram of the experimental device for heat exchange in a single tube capable of switching evaporation and condensation, disclosed by the invention, comprises: refrigerant cycle system, water cycle system and real-time data acquisition system.

The refrigerant cycle system includes: the device comprises a liquid storage tank 1, a drying filter 2, a subcooler 3, a diaphragm metering pump B4, a pulsation damper 4, a second plate heat exchanger HE2, an experimental section 5 and a third plate heat exchanger HE 3.

In a refrigerant circulating system, a bypass loop provided with an electric control valve M1 is connected from a liquid storage device 1 to an outlet of a diaphragm metering pump B4, when the flow of refrigerant is too small, the flow of refrigerant at the outlet of the diaphragm metering pump B4 is unstable, and the flow of refrigerant is unstable, the electric control valve M1 is opened to improve the flow of refrigerant, so that the refrigerant with large flow rate is shunted after passing through the diaphragm metering pump B4, part of refrigerant flows back to the liquid storage device 1, the flow of refrigerant at the outlet of the diaphragm metering pump B4 can be ensured to be stable, more stable flow measurement is realized, and a guarantee is provided.

In the refrigerant circulating system, the values of the fourth pressure sensor P4 and the fifteenth platinum resistor T15 are observed through a real-time data acquisition control system, and the output is correspondingly adjusted, so that the refrigerant flowing out of the subcooler in a supercooled state is ensured to be in a full liquid state when passing through the first liquid viewing mirror S1.

In the refrigerant circulating system, the heat exchange in the second plate heat exchanger HE2 and the heat exchange in the third plate heat exchanger HE3 are both the heat exchange between the refrigerant and water.

In the refrigerant circulation system, a vent valve VR14 is arranged above the experiment section 5, the vent valve VR14 is 30-50cm away from the experiment section 5 in vertical distance, non-condensable gas generated in condensation heat exchange experiments and non-condensable gas generated when the operation time of the experiment device is too long are eliminated, the experiment process is not influenced by the non-condensable gas, and the accuracy of experiment data is ensured.

In a refrigerant circulating system, a first needle valve P5-1, a second needle valve P5-2, a third needle valve P5-3, a fourth needle valve P5-4 and a fifth needle valve P5-5 are sequentially reserved, pressure measurement, leak detection and refrigerant filling are carried out on a switchable evaporation and condensation single-pipe heat exchange experimental device, and normal operation and experimental accuracy and reasonability of the switchable evaporation and condensation single-pipe heat exchange experimental device are guaranteed.

The water circulation system comprises an evaporation treatment circulation loop, a precooling treatment circulation loop, an experimental section water circulation loop, a condensation treatment circulation loop and a supercooling treatment circulation loop.

In the water circulation system, the evaporation treatment circulation circuit includes: the system comprises a second plate heat exchanger HE2, a fifth electromagnetic flowmeter G5, a front end electric heating H2, an expansion water tank E and a front end water pump B2.

In the water circulation system, the fifth electromagnetic flowmeter G5 is an electromagnetic flowmeter with the model number of LDY-15S-21CC-12-01-0- (3) -6-10-00 and the flow range of 0.3-3 m³/h。

In the water circulation system, the pre-cooling treatment circulation circuit includes: the system comprises a second plate heat exchanger HE2, a fifth electromagnetic flowmeter G5, a glycol low-temperature water tank 6, a Y-shaped filter 7 and a low-temperature circulating water pump B3.

In a water circulation system, a light horizontal multi-stage centrifugal pump is adopted as a low-temperature circulating water pump B3, and the model is CHL2-40 LSWSC.

In the water circulation system, the experiment section water circulation loop comprises: experiment section 5, test electric heating H1, first plate heat exchanger HE1, test water pump B1.

In the water circulation system, the heat exchange in the first plate heat exchanger HE1 is the heat exchange between water and water.

In the water circulation system, the condensation treatment circulation circuit includes: the system comprises a third plate heat exchanger HE3, a glycol low-temperature water tank 6, a Y-shaped filter 7, a low-temperature circulating water pump B3 and a fourth electromagnetic flowmeter G4.

In the water circulation system, the fourth electromagnetic flow meter G4 is an electromagnetic flow meter with the model number AXF015G, and the flow speed ranges from 0.3 m/s to 10 m/s.

In the water circulation system, the supercooling circulation circuit includes: the system comprises a subcooler 3, an ethylene glycol low-temperature water tank 6, a Y-shaped filter 7 and a low-temperature circulating water pump B3.

In the water circulation system, the subcooler 3 adopts a coaxial heat exchanger with the model of SS-0075 GT-U.

As shown in fig. 2, the real-time data acquisition control system of the present invention includes a manual control system, a touch screen system, a PLC system and a computer LabVIEW software system.

The data acquisition lines and the device control lines of the devices 11 are connected to a PLC system formed by PLC hardware 8.

Part of the data acquisition lines and device control lines of the device 11 are connected to a manual control system.

The direct control of the device 11 is realized through a refrigerant flow PID controller U1, an experimental section 5 water flow PID controller U2, a third plate heat exchanger HE3 water flow PID controller U3, an experimental section 5 water inlet temperature PID controller U4, an experimental section 5 front refrigerant temperature PID controller U5, an ethylene glycol low-temperature water tank 6 water outlet temperature PID controller U6, a liquid reservoir 1 condensation pressure PID controller U7, an experimental section 5 outlet pressure PID controller U8, a first electronic expansion valve EXV1 controller X1, a second electronic expansion valve EXV2 controller X2, a diaphragm metering pump B4 frequency converter F1, a test water pump B1 frequency converter F2 and a front end water pump B2 frequency converter F3.

Direct control of the device 11 is achieved by a PLC control system.

In the real-time data acquisition control system, a MICROMASTER 440 series frequency converter is adopted.

As shown in fig. 3, the touch screen 10 is disposed on the front panel of the power cabinet and can collect data in real time, and the touch screen system communicates with the PLC system through an RS485 communication line.

In the real-time data acquisition control system, the computer LabVIEW software system realizes communication with the PLC system through the PLC wireless module.

The system start SB1 and the system stop SB2 of the front panel of the power cabinet control the start and stop of the whole system, and when the alarm is sounded, the alarm reset SB6 can be pressed to stop the alarm.

The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.