CN211478123U - Fin tube heat transfer performance testing device - Google Patents
Fin tube heat transfer performance testing device Download PDFInfo
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- CN211478123U CN211478123U CN201922193948.4U CN201922193948U CN211478123U CN 211478123 U CN211478123 U CN 211478123U CN 201922193948 U CN201922193948 U CN 201922193948U CN 211478123 U CN211478123 U CN 211478123U
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Abstract
The utility model relates to a finned tube heat transfer performance testing arrangement, including cold source subassembly, heat source subassembly and test assembly. The cold source component comprises a condensing device, and the condensing device is connected with three condensing water supply pipelines and three condensing water return pipelines; the heat source component comprises evaporation equipment, and three evaporation water supply pipelines and three evaporation water return pipelines are connected to the evaporation equipment; six first mounting holes are formed in the two ends of the test cavity, and the six finned tubes horizontally penetrate through the first mounting holes in the two ends; one end of the finned tube is connected with a condensation water supply pipeline or an evaporation water supply pipeline, the other end of the finned tube is connected with a condensation water return pipeline or an evaporation water return pipeline, and refrigerating liquid is arranged in the test cavity; a third temperature sensor is arranged in the test cavity; the condensation water supply pipeline or the evaporation water supply pipeline is provided with a first flowmeter, a first temperature sensor and a first pressure sensor close to the finned tube; and a second temperature sensor and a second pressure sensor are arranged on the condensation water return pipeline or the evaporation water return pipeline close to the finned tube.
Description
Technical Field
The utility model relates to a reinforce the heat transfer field, especially relate to a finned tube heat transfer performance testing arrangement.
Background
The finned tube is widely applied to the fields of energy, chemical industry, petroleum, metallurgy and the like, and is a medium for heat exchange of cold and heat sources inside and outside the tube. As the main heat exchange element of the heat exchanger, the heat exchange performance of the finned tube determines the performance of the heat exchanger, and the finned tube with better heat exchange performance can achieve the purposes of efficient heat exchange, energy conservation and emission reduction.
The conventional test bench can only penetrate 1-2 finned tubes, test once and recover the refrigerant once, and recover the refrigerant by adopting a gravity recovery or cooling and heating recovery mode, so that the waste amount of the refrigerant is large; the evaporation and condensation cylinder bodies of the conventional test board are two separated cylinder bodies, and the condensation cylinder body is used as an auxiliary during evaporation test; when the condensation test is carried out, the evaporation cylinder is used as an assistant, and the enterprise cost is high.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a finned tube heat transfer performance testing arrangement who has reduced the waste of refrigerant, has shortened test time, has reduced intensity of labour, has saved the detection cost.
In order to achieve the above purpose, the utility model adopts the technical scheme that:
the utility model provides a finned tube heat transfer performance testing arrangement, include:
the cold source assembly comprises a condensing device, and at least two condensation water supply pipelines and at least two condensation water return pipelines are connected to the condensing device;
the heat source component comprises evaporation equipment, and at least two evaporation water supply pipelines and at least two evaporation water return pipelines are connected to the evaporation equipment;
the test assembly comprises a test cavity, at least two first mounting holes are respectively and correspondingly formed in two ends of the test cavity, at least two finned tubes horizontally penetrate through the first mounting holes in the two ends, and the finned tubes and the first mounting holes are sealed; one end of each finned tube is connected with a condensation water supply pipeline or an evaporation water supply pipeline, the other end of each finned tube is connected with a condensation water return pipeline or an evaporation water return pipeline, and a refrigerant is arranged in the test cavity;
a third temperature sensor is arranged in the test cavity; the condensation water supply pipeline or the evaporation water supply pipeline is provided with a first flowmeter, a first temperature sensor and a first pressure sensor close to the finned tube; and a second temperature sensor and a second pressure sensor are arranged on the condensation water return pipeline or the evaporation water return pipeline close to the finned tube.
Further, the finned tube comprises an evaporation tube and a condensation tube; when the evaporation pipe is tested, two ends of the evaporation pipe are respectively connected with an evaporation water supply pipeline and an evaporation water return pipeline, and the evaporation pipe is submerged in the refrigerant; when the condenser pipe is tested, the two ends of the condenser pipe are respectively connected with the condensation water supply pipeline and the condensation water return pipeline, and the liquid level of the refrigerant is lower than 4-7 cm of the condenser pipe.
Furthermore, two observation windows with different heights are arranged on the test cavity, and the observation windows are made of transparent materials.
Furthermore, a circular groove is formed in the outer wall of the test cavity and along the outer edge of the first mounting hole, and a flexible sealing ring is arranged in the circular groove; the test chamber is characterized by further comprising a mounting sleeve, the mounting sleeve is provided with a second mounting hole, the mounting sleeve is installed on the two end faces of the test chamber in a threaded mode, and the second mounting hole corresponds to the first mounting hole.
Furthermore, the evaporation equipment is connected with three evaporation water supply pipelines and three evaporation water return pipelines.
Further, the evaporation equipment is heated by an electric heater.
Furthermore, the condensing equipment is connected with three condensing water supply pipelines and three condensing water return pipelines.
Further, a third pressure sensor is arranged in the test cavity.
Further, the two ends of the test cavity are provided with six mounting holes.
Because of the application of the technical scheme, compared with the prior art, the utility model has the following advantages:
when the heat transfer performance testing device for the finned tube is used for testing the evaporating tubes, the test cavity is vacuumized, sufficient refrigerant is added, at least two evaporating tubes are placed into the mounting holes, and gaps between the mounting holes and the evaporating tubes are sealed; connecting one end of an evaporation pipe with an evaporation water supply pipeline, connecting the other end of the evaporation pipe with an evaporation water return pipeline, and starting evaporation equipment to enable steam to enter the evaporation water supply pipeline, pass through a first flowmeter, a first temperature sensor and a first pressure sensor, enter the evaporation pipe from an evaporation pipe inlet, exit from an evaporation pipe outlet, enter the evaporation water return pipeline, and return to the evaporation equipment through a second temperature sensor and a second pressure sensor;
when the condenser pipes are tested, the test cavity is vacuumized, sufficient refrigerant is added, at least two condenser pipes are placed into the mounting holes at the same time, and gaps between the mounting holes and the condenser pipes are sealed; one ends of three condenser pipes are respectively connected with three condensation water supply pipelines, the other ends of the three condenser pipes are connected with a condensation water return pipeline, condensation equipment is opened, steam enters the condensation water supply pipeline and enters the condenser pipes from condenser pipe inlets through a second flowmeter, a second temperature sensor and a second pressure sensor, and the steam is discharged from a condenser pipe outlet and enters the condensation water return pipeline and returns to the condensation equipment through the second temperature sensor and the second pressure sensor.
Drawings
Some specific embodiments of the present invention will be described in detail hereinafter, by way of illustration and not by way of limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:
fig. 1 is a schematic view of a fin tube heat transfer performance testing apparatus according to an embodiment of the present invention;
FIG. 2 is a top view of a device for testing heat transfer performance of the finned tube shown in FIG. 1;
FIG. 3 is a left side view of a device for testing heat transfer performance of the finned tube shown in FIG. 1.
Wherein the reference numerals are as follows:
1. the cold source component: 11. a condensing device; 12. a condensed water supply pipeline; 13. a condensation water return pipeline;
2. a heat source component: 21. an evaporation apparatus; 22. an evaporation water supply pipeline; 23. an evaporation water return pipeline;
3. testing the assembly: 31. a test cavity; 32. a first mounting hole; 33. and (4) an observation window.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.
The heat transfer performance testing device for the finned tubes shown in fig. 1 to 3 comprises a heat sink assembly, a heat source assembly and a testing assembly.
The cold source assembly comprises a condensing device 11, and at least two condensed water supply pipelines 12 and at least two condensed water return pipelines 13 are connected to the condensing device 11;
the heat source component comprises evaporation equipment 21, and at least two evaporation water supply pipelines 22 and at least two evaporation water return pipelines 23 are connected to the evaporation equipment 21;
the test assembly comprises a test cavity 31, at least two first mounting holes 32 are respectively and correspondingly formed in two end faces of the test cavity 31, at least two finned tubes horizontally penetrate through the first mounting holes 32 in two ends of the test cavity 31, and the finned tubes and the first mounting holes 32 are sealed; one end of each finned tube is connected with a condensation water supply pipeline 12 or an evaporation water supply pipeline 22, the other end of each finned tube is connected with a condensation water return pipeline 13 or an evaporation water return pipeline 23, and a refrigerant is arranged in the test cavity 31;
a third temperature sensor and a third pressure sensor are arranged in the test cavity 31; the condensation water supply pipeline 12 or the evaporation water supply pipeline 22 is provided with a first flowmeter, a first temperature sensor and a first pressure sensor close to the inlet of the finned tube; and a second temperature sensor and a second pressure sensor are arranged on the condensation water return pipeline 13 or the evaporation water return pipeline 23 close to the outlet of the finned tube.
The finned tube comprises an evaporation tube and a condensation tube; when the evaporation pipe is tested, the inlet of the evaporation pipe is connected with an evaporation water supply pipeline 22, the outlet of the evaporation pipe is connected with an evaporation water return pipeline 23, and the evaporation pipe is submerged in the refrigerant; during the test condenser pipe, the access connection of condenser pipe the condensation water supply pipe 12, the exit linkage condensation return water pipe 13 of condenser pipe, the refrigerant liquid level is less than 4~7cm of condenser pipe, this embodiment specifically is 5 cm.
The test cavity 31 is provided with two observation windows 33 with different heights, and the observation windows 33 are made of transparent materials; the observation window 33 is used for observing the condition of the refrigerant in the test cavity.
Both ends of the test cavity 31 are provided with six mounting holes. The evaporation equipment 21 of this embodiment adopts an electric heater for heating, and meanwhile, the evaporation equipment 21 is connected with three evaporation water supply pipelines 22 and three evaporation water return pipelines 23. The condensing equipment 11 of this embodiment adopts the cooler condensation, be connected with three condensation water supply pipe 12 and three condensation return water pipe 13 on the condensing equipment 11.
A circular groove is formed in the outer wall of the test cavity and along the outer edge of each first mounting hole 32, and a flexible sealing ring is arranged in each circular groove; the test chamber is characterized by further comprising two mounting sleeves, each mounting sleeve is provided with a second mounting hole, the two mounting sleeves are mounted on the two end faces of the test chamber in a threaded mode, and the second mounting holes correspond to the first mounting holes 32. During the test, run through the mounting hole setting at test chamber both ends with the finned tube, establish flexible sealing washer cover the finned tube is last and install in the circular slot, install the installation cover bolt on the test chamber outer wall and the second mounting hole cover is established on the finned tube, the effect of installation cover compresses tightly flexible sealing washer, makes the sealing washer better to the sealed effect between mounting hole and the finned tube.
Control valves are arranged on the condensation water supply pipeline 12, the condensation water return pipeline 13, the evaporation water supply pipeline 22 and the evaporation water return pipeline 23. The first flowmeter, the first temperature sensor and the first pressure sensor detect the flow, the temperature and the pressure of the inlet of the finned tube, the second flowmeter, the second temperature sensor and the second pressure sensor detect the flow, the temperature and the pressure of the outlet of the finned tube, and the third temperature sensor and the third pressure sensor detect the temperature and the pressure of the refrigerant in the test cavity.
The automatic control system further comprises a controller, wherein the first flowmeter, the first temperature sensor, the first pressure sensor, the second flowmeter, the second temperature sensor, the second pressure sensor, the third temperature sensor and the third pressure sensor are all connected to a signal input end of the controller, detected data are input into the controller, control valves on the condensation water supply pipeline 12, the condensation water return pipeline 13, the evaporation water supply pipeline 22 and the evaporation water return pipeline 23 are all connected to a signal output end of the controller, the controller controls the opening of the control valves, and the controller processes and calculates the detected data according to a calculation method in the working principle.
The embodiment works as follows:
when the evaporation tubes are tested, vacuumizing a test cavity, adding sufficient refrigerant, simultaneously placing six evaporation tubes into mounting holes, and sealing gaps between the mounting holes and the evaporation tubes; the inlet ends of three evaporation pipes are respectively connected with three evaporation water supply pipelines 22, the outlet ends of the three evaporation water supply pipelines are connected with three evaporation water return pipelines 23, a controller controls to open control valves on the evaporation water supply pipelines 22 and the evaporation water return pipelines 23, so that steam enters the evaporation water supply pipelines 22, enters the evaporation pipes from the evaporation pipe inlets through a first flowmeter, a first temperature sensor and a first pressure sensor which are close to the evaporation pipe inlets, and enters the evaporation water return pipelines 23 from the evaporation pipe outlets, and returns to the evaporation equipment 21 through a second temperature sensor and a second pressure sensor which are close to the evaporation pipe outlets, and the controller processes and calculates detected data to obtain the performance conditions of the evaporation pipes; after the three evaporation pipes are detected, the three evaporation water supply pipelines 22 and the three evaporation water return pipelines 23 are taken down from the three evaporation pipes and then connected to the other three evaporation pipes, and the other three evaporation pipes are detected and taken out after the detection of all six evaporation pipes is finished;
secondly, when the condenser pipes are tested, vacuumizing the test cavity, adding enough refrigerant, simultaneously placing the six condenser pipes into the mounting holes, and sealing gaps between the mounting holes and the condenser pipes; the inlet of each of the three condenser pipes is respectively connected with three condensation water supply pipelines 12, the outlet of each of the three condenser pipes is connected with three condensation water return pipelines 13, a controller controls to open control valves on the condensation water supply pipelines 12 and the condensation water return pipelines 13, so that steam enters the condensation water supply pipelines 12, passes through a second flowmeter, a second temperature sensor and a second pressure sensor which are close to the inlets of the condenser pipes, enters the condenser pipes from the inlets of the condenser pipes, comes out of the outlets of the condenser pipes, enters the condensation water return pipelines 13, and returns to the condensation equipment 11 through the second temperature sensor and the second pressure sensor which are close to the outlets of the condenser pipes, and the controller processes and calculates detected data to obtain the performance condition of the condenser pipes; after detecting three condenser pipes, three condensation water supply pipelines 12 and three condensation return water pipelines 13 are taken down from the three condenser pipes and then connected to the other three condenser pipes, and the other three condenser pipes are detected and taken out after six condenser pipes are detected.
The test bench has the following advantages:
1. the test cavity is simultaneously penetrated with 6 finned tubes, and under the same test condition, the waste of the refrigerant can be reduced by about 5kg each time;
2. the detection time is shortened, the number of the penetrating pipes is large, the refrigerant recovery times are reduced, and the detection time is effectively saved;
3. the evaporation and condensation tests adopt the same test cylinder, so that the test cylinders are reduced;
4. after the finned tube penetrates into the container, a quick packaging mechanism (a flexible sealing ring and a mounting sleeve) is adopted, so that the labor intensity is reduced, and the tube penetrating and drawing time is shortened;
5. and the refrigerant is filled and recovered by adopting the refrigerant recovery machine, so that the waste of the refrigerant is reduced, and the testing time is shortened.
The working principle of the embodiment is as follows: under the heat balance, the heat exchange quantity of the fluid flowing through the finned tubes is equal to the heat exchange quantity of the finned tubes to the outside. The fluid heat exchange quantity, namely the external heat transfer quantity of the finned tube, is obtained through calculation by measuring the liquid flow passing through the finned tube and the temperature of an inlet and an outlet. Meanwhile, the saturation temperature of the refrigerant outside the fin tube is measured, and the logarithmic temperature difference can be calculated, so that the total heat transfer coefficient is obtained.
As the fluid flows through the finned tubes, resistance needs to be overcome, causing a pressure loss in the fluid. The resistance in the finned tubes of different structures is different, so that the resistance characteristic of the finned tubes is reflected by measuring the pressure drop of fluid entering and exiting the finned tubes.
The calculation method is as follows:
note that the symbols in the formulas in the table are as follows:
a-the heat exchange area under the nominal pipe diameter outside the finned tube, and the unit is square meter (m)2)；
Ao-the lower cross-sectional area of the nominal pipe diameter in the finned tube, in square meters (m)2)；
CpSpecific heat at constant pressure, unit is Kerr per kilogram [ J/(kg.K)]；
G volume flow rate, unit is cubic meter per second (M)3/s)；
I-current, in amperes (A);
q-heat transfer, in watts (W);
delta Q-thermal balance relative error, dimensionless;
Qeelectrical power in watts (W);
T1fluid inlet temperature in tubes in degrees centigrade (° c);
T2-fluid outlet temperature in tubes in degrees centigrade (° c);
Δtmabout the logarithmic mean temperature difference in degrees Celsius (. degree. C.);
tr-refrigerant saturation temperature in degrees celsius (° c);
U0-total heat transfer coefficient in units of watts per square meter Kelvin [ W/(m)2.K)]；
Ve-the voltage of the cooler or heater in volts (V);
v-flow velocity in the tube, unit is meter per second (m/s);
rho-density in kilograms per cubic meter (kg/m)3)；
-coefficient of frictional resistance;
q-heat flow density in watts per square meter (W/m)2)；
ReReynolds number, dimensionless;
Cf-coefficients in the formula, dimensionless;
n is the index in the formula and is dimensionless.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and to implement the present invention, so as not to limit the protection scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.
Claims (9)
1. A heat transfer performance testing device for a finned tube is characterized by comprising:
the cold source assembly comprises a condensing device, and at least two condensation water supply pipelines and at least two condensation water return pipelines are connected to the condensing device;
the heat source component comprises evaporation equipment, and at least two evaporation water supply pipelines and at least two evaporation water return pipelines are connected to the evaporation equipment;
the test assembly comprises a test cavity, at least two first mounting holes are respectively and correspondingly formed in two end faces of the test cavity, at least two finned tubes horizontally penetrate through the first mounting holes in the two ends of the test cavity, and the finned tubes and the first mounting holes are sealed; one end of each finned tube is connected with a condensation water supply pipeline or an evaporation water supply pipeline, the other end of each finned tube is connected with a condensation water return pipeline or an evaporation water return pipeline, and a refrigerant is arranged in the test cavity;
a third temperature sensor is arranged in the test cavity; the condensation water supply pipeline or the evaporation water supply pipeline is provided with a first flowmeter, a first temperature sensor and a first pressure sensor close to the finned tube; and a second temperature sensor and a second pressure sensor are arranged on the condensation water return pipeline or the evaporation water return pipeline close to the finned tube.
2. The finned tube heat transfer performance testing device of claim 1, wherein: the finned tube comprises an evaporation tube and a condensation tube; when the evaporation pipe is tested, two ends of the evaporation pipe are respectively connected with an evaporation water supply pipeline and an evaporation water return pipeline, and the evaporation pipe is submerged in the refrigerant; when the condenser pipe is tested, the two ends of the condenser pipe are respectively connected with the condensation water supply pipeline and the condensation water return pipeline, and the liquid level of the refrigerant is lower than 4-7 cm of the condenser pipe.
3. The finned tube heat transfer performance testing device of claim 2, wherein: the test cavity is provided with two observation windows with different heights, and the observation windows are made of transparent materials.
4. The finned tube heat transfer performance testing device of claim 1, wherein: a circular groove is formed in the outer wall of the test cavity and along the outer edge of the first mounting hole, and a flexible sealing ring is arranged in the circular groove; the test chamber is characterized by further comprising a mounting sleeve, the mounting sleeve is provided with a second mounting hole, the mounting sleeve is installed on the two end faces of the test chamber in a threaded mode, and the second mounting hole corresponds to the first mounting hole.
5. The finned tube heat transfer performance testing device of claim 1 or 4, characterized in that: the evaporation equipment is connected with three evaporation water supply pipelines and three evaporation water return pipelines.
6. The finned tube heat transfer performance testing device of claim 5, wherein: the evaporation equipment is heated by an electric heater.
7. The finned tube heat transfer performance testing device of claim 1 or 4, characterized in that: and the condensing equipment is connected with three condensing water supply pipelines and three condensing water return pipelines.
8. The finned tube heat transfer performance testing device of claim 1, wherein: and a third pressure sensor is also arranged in the test cavity.
9. The finned tube heat transfer performance testing device of claim 1, wherein: six mounting holes are formed in two ends of the test cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922193948.4U CN211478123U (en) | 2019-12-09 | 2019-12-09 | Fin tube heat transfer performance testing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922193948.4U CN211478123U (en) | 2019-12-09 | 2019-12-09 | Fin tube heat transfer performance testing device |
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| CN211478123U true CN211478123U (en) | 2020-09-11 |
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| CN201922193948.4U Active CN211478123U (en) | 2019-12-09 | 2019-12-09 | Fin tube heat transfer performance testing device |
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| CN (1) | CN211478123U (en) |
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