CN211206322U - Switchable evaporation and condensation single-tube heat exchange experiment system - Google Patents
Switchable evaporation and condensation single-tube heat exchange experiment system Download PDFInfo
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- CN211206322U CN211206322U CN201921788859.8U CN201921788859U CN211206322U CN 211206322 U CN211206322 U CN 211206322U CN 201921788859 U CN201921788859 U CN 201921788859U CN 211206322 U CN211206322 U CN 211206322U
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Abstract
The utility model relates to a single tube intraductal heat transfer experimental system of changeable evaporation and condensation, including refrigerant circulation system, water circulation system and real-time data acquisition control system, water circulation system includes evaporation treatment circulation circuit, precooling treatment circulation circuit, experiment section water circulation circuit, condensation treatment circulation circuit and supercooling treatment circulation circuit, and real-time data acquisition control system includes manual control system, touch-sensitive screen system, P L C system and computer L abVIEW software system the utility model discloses both can carry out single tube intraductal evaporation heat transfer experiment, also can carry out single tube intraductal condensation heat transfer experiment, can realize the independent regulation to electronic expansion valve aperture, pressure, the temperature of experiment section refrigerant, the operating frequency isoparametric of water pump simultaneously.
Description
Technical Field
The utility model relates to an evaporation condensation heat transfer experimental apparatus, concretely relates to changeable evaporation and single tube heat transfer experimental system in pipe of 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 utility model aims at providing a single tube internal heat exchange experimental system 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 above purpose, the technical scheme of the utility model is that:
a switchable evaporation and condensation single-tube-in-tube heat exchange experimental system 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 comprises a manual control system, a touch screen system, a P L C system and a computer L abVIEW software system, wherein the manual control system comprises a PID control system, an electronic expansion valve control system and a frequency converter control system, the PID control system comprises 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 condensation pressure PID controller U7 and an experimental section 5 outlet pressure PID controller U8, the electronic expansion valve control system comprises a first electronic expansion valve EXV1 controller X1 and a second electronic expansion valve EXV2 controller X2, and the frequency converter control system comprises a diaphragm metering pump B4 frequency converter F1, a test water pump B1 and a front end water pump 3.
When an evaporation and condensation single-tube-in-tube heat exchange experiment system capable of switching evaporation and condensation is used for carrying out evaporation and heat exchange experiments, a precooling treatment circulating loop, an experiment 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 experiment system capable of switching evaporation and condensation is used for carrying out condensation heat exchange experiments, an evaporation treatment circulation loop and an experiment 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 a liquid storage tank 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 a 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 is shunted after passing through the diaphragm metering pump B4, part of refrigerant flows back to the liquid storage tank 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.
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 lines and the device control lines of the device 11 are connected to a P L C system formed by P L C hardware 8, part of the data acquisition lines and the device control lines of the device 11 are connected to a manual control system, the touch screen system realizes communication with a P L C system through an RS485 communication line, and the computer L abVIEW software system realizes communication with a P L C system through a P L C 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 storage tank 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 plant 11 is achieved by the P L C 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-pipe heat exchange experiment system, and normal operation and experiment accuracy and reasonableness of the switchable evaporation and condensation single-pipe heat exchange experiment system are guaranteed.
The utility model has the advantages that: the utility model can not only carry out the evaporation heat exchange experiment in the single tube, but 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, wherein the schematic diagram includes a 1-liquid storage tank, a 2-dry filter, a 3-subcooler, a 4-pulsation damper, a 5-experimental section, a 6-ethylene glycol low-temperature water tank, a C-water chiller, a 7-Y filter, an E-expansion water tank, an HE-first plate heat exchanger, an HE-second plate heat exchanger, an HE-third plate heat exchanger, an EXV-first electronic expansion valve, an EXV-second electronic expansion valve, an S-first sight glass, an S-second sight glass, an S-third sight glass, an S-fourth sight glass, an H-test electric heating, an H-front end electric heating, a B-test water pump, a B-front end water pump, a B-low-temperature circulating water pump, a B-diaphragm metering pump, a P-first pressure sensor, a P-second pressure sensor, a P-third pressure sensor, a P-fourth pressure sensor, a P-first pressure sensor, a P-second pressure difference sensor, a G-first electric resistance ball valve, a G-electric resistance ball valve, a VW-VR-valve, a platinum-VR-needle valve, a platinum-needle valve-VW-electrical resistance-VW-VR-valve, a fifth electric resistance ball valve, a platinum-VR-needle valve, a platinum-VR-resistance ball valve, a platinum-VR-platinum-needle valve-VR-needle valve, a platinum-resistance-platinum-VR-needle valve, a platinum-VR-platinum-resistance-VR-valve, a platinum-VR-needle valve-platinum-resistance-needle valve-VR-valve, a platinum-VR-platinum-VR-valve-platinum-VR-platinum-VR-platinum-valve, a-platinum-valve, a platinum-VR-platinum-valve, a-platinum-VR-valve, a-platinum-VR-platinum-valve-VR-platinum.
Fig. 2 is the utility model discloses a real-time data acquisition control system connection diagram, 8-P L C hardware in the drawing, 9-computer, 10-touch-sensitive screen, 11-equipment, F1-diaphragm metering pump B4 pump frequency converter, F2-test water pump B1 frequency converter, F3-front end 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-experimental section 5 water flow PID controller, U3-third plate heat exchanger HE3 PID controller, U4-experimental section 5 inlet water temperature PID controller, U5-experimental section 5 front refrigerant temperature PID controller, U6-ethylene glycol low temperature water tank 6 outlet water temperature PID controller, U7-liquid storage pot 1 condensation pressure PID controller, U8-experimental section 5 outlet pressure PID controller.
FIG. 3 is a diagram of a front panel device of a power cabinet, in which the frequency converter of the F1-diaphragm metering pump B4 pump, the frequency converter of the F2-test water pump B1, the frequency converter of the F3-front water pump B2, the U1-refrigerant flow PID controller, the U2-experimental section 5 water flow PID controller, the U3-third plate heat exchanger HE3 water flow PID controller, the U4-experimental section 5 water inlet temperature PID controller, the U5-experimental section 5 front refrigerant temperature PID controller, the U6-glycol low temperature water tank 6 water outlet temperature PID controller, the U7-liquid storage tank 1 condensation pressure PID controller, the U8-experimental section 5 outlet pressure PID controller, the 10-touch screen, the SB 1-system start, the SB 2-system stop, the SB 3-emergency stop, the SB 4-abnormal alarm, the SB 5-alarm, SB 6-alarm reset.
Detailed Description
The following describes the usage of 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 utility model discloses a heat transfer experiment system schematic diagram in single tube of changeable evaporation and condensation includes: 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 the refrigerant circulating system, a bypass loop provided with an electric control valve M1 is connected from a liquid storage tank 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 passes through the diaphragm metering pump B4 to be shunted, part of refrigerant flows back to the liquid storage tank 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 for.
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 the 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 experiment system, and normal operation and experiment accuracy and reasonability of the switchable evaporation and condensation single-pipe heat exchange experiment system 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 model number of L DY-15S-21CC-12-01-0- (3) -6-10-00 and the flow range is 0.3-3m3/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 the water circulation system, a light horizontal multistage centrifugal pump is adopted as a low-temperature circulating water pump B3, and the model is CH L2-40L SWSC.
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 P L C system and a computer L abVIEW software system.
The data acquisition lines and device control lines of the device 11 are connected to the P L C system of P L C 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 storage tank 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 plant 11 is achieved by the P L C 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 P L C system through an RS485 communication line.
In the real-time data acquisition control system, a computer L abVIEW software system realizes the communication with a P L C system through a P L C 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 above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may 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.
Claims (8)
1. The utility model provides a single intraductal heat transfer experimental system 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 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 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 experimental section water circulation loop comprises: the device comprises an experimental section (5), a test electric heater H1, a first plate heat exchanger HE1 and a test water pump B1, wherein heat exchange in the first plate heat exchanger HE1 is heat exchange between water and water;
the condensate treatment circulation loop comprises: 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;
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 comprises a manual control system, a touch screen system, a P L C system and a computer L abVIEW 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 storage tank (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.
2. The switchable evaporation and condensation single-tube-in-tube heat exchange experimental system 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;
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, 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 HE1 provides cold for the experiment section (5).
3. The switchable evaporation and condensation single-tube-in-tube heat exchange experimental system according to claim 1, wherein:
in the refrigerant circulating system, a bypass loop provided with an electric regulating valve M1 is connected from a liquid storage tank (1) to an outlet of a diaphragm metering pump B4.
4. The switchable evaporation and condensation single-tube-in-tube heat exchange experimental system according to claim 1, wherein:
and a gas release valve VR14 is arranged above the experimental section (5), and the vertical distance between the gas release valve VR14 and the experimental section (5) is 30-50 cm.
5. The switchable evaporation and condensation single-tube-in-tube heat exchange experimental system according to claim 1, wherein:
the data acquisition lines and device control lines of the device (11) are both connected to the P L C system of P L C 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 realizes communication with the P L C system through an RS485 communication line;
the computer L ABVIEW software system realizes the communication with the P L C system through a P L C wireless module.
6. The switchable evaporation and condensation single-tube-in-tube heat exchange experimental system according to claim 1, wherein:
the direct control of the equipment (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 storage tank (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 water pump B2 frequency converter F3.
7. The switchable evaporation and condensation single-tube-in-tube heat exchange experimental system according to claim 1, wherein:
direct control of the plant (11) is achieved by the P L C control system.
8. The switchable evaporation and condensation single-tube-in-tube heat exchange experimental system 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.
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| CN201921788859.8U CN211206322U (en) | 2019-10-23 | 2019-10-23 | Switchable evaporation and condensation single-tube heat exchange experiment system |
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| CN110596186A (en) * | 2019-10-23 | 2019-12-20 | 上海海洋大学 | Switchable evaporation and condensation single-tube heat exchange experimental device |
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| CN110596186A (en) * | 2019-10-23 | 2019-12-20 | 上海海洋大学 | Switchable evaporation and condensation single-tube heat exchange experimental device |
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