CN219511810U - Heat exchange performance testing device of backheating capillary tube - Google Patents
Heat exchange performance testing device of backheating capillary tube Download PDFInfo
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- CN219511810U CN219511810U CN202223440315.7U CN202223440315U CN219511810U CN 219511810 U CN219511810 U CN 219511810U CN 202223440315 U CN202223440315 U CN 202223440315U CN 219511810 U CN219511810 U CN 219511810U
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Abstract
The utility model provides a heat exchange performance testing device of a regenerative capillary tube. The heat exchange performance testing device comprises an air return output pipeline, first detection equipment, a compressor, a heat exchanger, a capillary tube input pipeline, second detection equipment, a capillary tube output pipeline, third detection equipment, an air return input pipeline and fourth detection equipment. The return air output pipeline is used for communicating with an outlet of a return air pipe of the to-be-detected regenerative capillary tube; the first detection equipment is arranged on the return air output pipeline; the compressor is arranged at the downstream of the return air output pipeline; the heat exchanger is arranged at the downstream of the compressor; the capillary tube input pipeline is arranged at the downstream of the heat exchanger; the second detection device is arranged on the capillary input pipeline; the capillary output pipeline is used for communicating with the outlet of the capillary; the third detection device is arranged on the capillary output pipeline; the return air input pipeline is connected with the capillary output pipeline and the inlet of the return air pipe; the fourth detection device is arranged on the return air input pipeline.
Description
Technical Field
The utility model relates to the technical field of heat recovery capillary tube testing, in particular to a heat exchange performance testing device of a heat recovery capillary tube.
Background
The backheating capillary tube is one of four important parts forming a refrigerating system of the refrigerator, and the heat exchange effect is one of important factors influencing the refrigerating effect of the refrigerating system. In practical application, the capillary tube and the muffler are adopted to exchange heat so as to improve the energy efficiency of the system. The contact type of the capillary tube and the muffler is aluminum foil wrapping, soldering contact and the like, and the heat exchange performance of different contact types is different. The heat exchange performance of the test capillary tube and the heat return tube is used for guiding and optimizing the design of the heat exchange section of the heat return capillary tube, and the method has important significance for improving the energy efficiency of the refrigerator. However, there is currently no suitable device on the market to detect the heat exchange performance of the regenerative capillary tube.
Disclosure of Invention
The utility model aims to provide a heat exchange performance testing device of a regenerative capillary tube, which aims to solve the problems in the prior art.
In order to solve the technical problems, the utility model provides a heat exchange performance testing device of a regenerative capillary tube, wherein the regenerative capillary tube comprises a capillary tube and an air return pipe, and the heat exchange performance testing device comprises:
the return air output pipeline is used for being communicated with an outlet of an air return pipe of the heat return capillary tube to be tested;
the first detection device is arranged on the air return output pipeline and is used for detecting the temperature of the fluid;
the compressor is arranged at the downstream of the return air output pipeline;
a heat exchanger disposed downstream of the compressor;
the capillary tube input pipeline is arranged at the downstream of the heat exchanger and is used for being connected with the inlet of the capillary tube of the heat recovery capillary tube to be tested;
the second detection device is arranged on the capillary input pipeline and is used for detecting the temperature and the pressure of the fluid;
a capillary output line for communicating with an outlet of the capillary;
the third detection device is arranged on the capillary output pipeline and is used for detecting the temperature and the pressure of the fluid;
the return air input pipeline is connected with the capillary output pipeline and the inlet of the return air pipe;
the fourth detection device is arranged on the return air input pipeline and is used for detecting the temperature and the pressure of the fluid;
the heat exchange performance of the heat recovery capillary tube to be detected can be obtained according to data detected by the first detection device, the second detection device, the third detection device and the fourth detection device respectively.
In some embodiments the heat exchanger is a fin tube heat exchanger;
the heat exchanger comprises an air inlet and an air outlet, and a condensing fan is arranged in the flowing direction of air in and out.
In some embodiments the heat exchange performance test apparatus further comprises a flow meter disposed between the compressor and the heat exchanger for metering fluid.
In some embodiments the heat exchange performance test device further comprises a first heat exchanger disposed between the heat exchanger and the capillary tube input line;
the first heat exchanger comprises a first channel and a second channel which can exchange heat with each other, and a first constant temperature device, wherein the first channel is used for flowing refrigerant, the second channel is used for flowing cooling medium, and the inlet and the outlet of the second channel are communicated with the inlet and the outlet of the first constant temperature device.
In some embodiments a first temperature sensor is further provided upstream of the first heat exchanger and a second temperature sensor is further provided downstream of the first heat exchanger.
In some embodiments the heat exchange performance test apparatus further comprises a second heat exchanger disposed between the third detection device and the fourth detection device;
the second heat exchanger comprises a refrigeration channel and a medium channel which can exchange heat with each other, and second constant temperature equipment, wherein the refrigeration channel is used for flowing refrigerant, the medium channel is used for flowing the refrigerant, and the inlet and the outlet of the medium channel are communicated with the inlet and the outlet of the second constant temperature equipment.
In some embodiments the heat exchange performance test apparatus further comprises a supercooling degree adjustment device disposed between the heat exchanger and the capillary tube input line for adjusting the supercooling degree of the fluid entering the capillary tube;
the temperature regulation of the supercooling degree regulating device is realized by an electric heater.
In some embodiments the heat exchange performance test apparatus further comprises a superheat adjustment device disposed between the third and fourth detection devices for adjusting the superheat of the fluid entering the muffler;
the temperature of the superheat adjusting device is adjusted by an electric heater.
In some embodiments, the heat exchange performance test device further comprises a liquid viewing mirror, wherein the liquid viewing mirror is arranged at the inlet of the capillary tube input pipeline;
the heat exchange performance testing device further comprises a dry filter, and the dry filter is arranged at the upstream of the capillary tube input pipeline.
In some embodiments the first detection device comprises a temperature sensor, and the second detection device, the third detection device, and the fourth detection device each comprise a temperature sensor and a pressure sensor;
the first detection device further comprises a pressure sensor.
According to the technical scheme, the utility model has the advantages and positive effects that:
the heat exchange performance testing device comprises a return air output pipeline, first detection equipment, a compressor, a heat exchanger, a capillary tube input pipeline, second detection equipment, a capillary tube output pipeline, third detection equipment, a return air input pipeline and fourth detection equipment. The capillary tube in the backheating capillary tube to be measured is respectively connected with the capillary tube input pipeline and the capillary tube output pipeline, and two ends of the return air tube are respectively connected with the return air tube input pipeline and the return air tube output pipeline, so that the heat exchange performance and the backheating capillary tube form a complete passage for fluid to flow. In the passage, the data of the inlet and the outlet of the capillary tube and the data of the inlet and the outlet of the muffler are detected, and the temperature efficiency epsilon of the regenerative capillary tube is obtained through calculation, so that the heat exchange performance of the regenerative capillary tube is obtained.
Further, through measuring the flow, the heat exchange quantity Q 'in unit length can be calculated at the same time, and the steady-state performance of the regenerative capillary tube is quantitatively evaluated through two indexes of the temperature efficiency epsilon and the heat exchange quantity Q' in unit length, so that the accuracy of evaluating the regenerative capillary tube is improved.
Drawings
FIG. 1 is a schematic diagram of a heat exchange performance test device according to an embodiment of the present utility model.
The reference numerals are explained as follows:
11. a return air output pipeline; 12. a first detection device; 13. a compressor; 14. a heat exchanger; 141. a condensing fan; 15. a capillary input line; 16. a second detection device; 17. a capillary output line; 18. a third detection device; 19. a return air input pipeline; 20. a fourth detection device; 21. a flow meter; 22. a first heat exchanger; 221. a first thermostatic device; 225. a first temperature sensor; 226. a second temperature sensor; 23. a second heat exchanger; 231. a second thermostatic device; 24. a supercooling degree adjusting apparatus; 25. a superheat degree adjusting device; 26. a liquid viewing mirror; 27. drying the filter;
91. a capillary tube; 92. and an air return pipe.
Detailed Description
Exemplary embodiments that embody features and advantages of the present utility model will be described in detail in the following description. It will be understood that the utility model is capable of various modifications in various embodiments, all without departing from the scope of the utility model, and that the description and illustrations herein are intended to be by way of illustration only and not to be construed as limiting the utility model.
For the purpose of further illustrating the principles and structure of the present utility model, preferred embodiments of the utility model will now be described in detail with reference to the accompanying drawings.
The utility model provides a heat exchange performance testing device of a backheating capillary tube, which is used for testing the heat exchange performance of the backheating capillary tube in a refrigerating system of a refrigerator.
Wherein, the backheating capillary tube comprises a capillary tube and a backheating tube.
FIG. 1 is a schematic diagram of an embodiment of a heat exchange performance test apparatus according to the present utility model.
Referring to fig. 1, the heat exchange performance testing apparatus includes a return air output line 11, a first detecting device 12, a compressor 13, a heat exchanger 14, a capillary tube input line 15, a second detecting device 16, a capillary tube output line 17, a third detecting device 18, a return air input line 19, and a fourth detecting device 20. The capillary tube 91 in the backheating capillary tube is respectively connected with the capillary tube input pipeline 15 and the capillary tube output pipeline 17, and two ends of the air return tube 92 are respectively connected with the air return input pipeline 19 and the air return output pipeline 11, so that the heat exchange performance testing device and the backheating capillary tube form a complete passage for fluid to flow. In this path, the data at the inlet and outlet of the capillary tube 91 are detected, and the heat exchange performance of the regenerative capillary tube is obtained by calculation from the data at the inlet and outlet of the muffler 92.
The heat exchange performance testing device is specifically described below.
The return air output pipeline 11 is used for communicating with the outlet of the return air pipe 92 of the heat recovery capillary tube to be tested.
The first detecting device 12 is disposed on the return air output pipeline 11 and is used for detecting the temperature of the fluid. Specifically, the first detection device 12 includes a temperature sensor. Further, the first detection device 12 also comprises a pressure sensor.
A compressor 13 is provided downstream of the return air output line 11. The rotation speed of the compressor 13 can be adjusted, so that the heat exchange performance testing device meets the testing requirements of different operation conditions.
The fluid on the return air output pipeline 11 is refrigerant gas, and is high-temperature and high-pressure gas after being pressurized by the compressor 13.
The heat exchanger 14 is disposed downstream of the compressor 13. The heat exchanger 14 consistent with the heat exchanger 14 in the refrigerator can be adopted, so that the accuracy of test data of the heat exchange performance test device is ensured.
In particular, in the present embodiment, the heat exchanger 14 is a fin-tube heat exchanger.
The heat exchanger 14 includes a refrigerant inlet, a refrigerant outlet, an air inlet, and an air outlet. The refrigerant inlet is connected to the compressor 13. A condensing fan 141 is provided in a circulation direction of the air in and out.
The high-temperature and high-pressure gas entering the heat exchanger 14 is liquefied after heat dissipation and cooling, and becomes high-pressure and normal-temperature refrigerant liquid.
A capillary tube input line 15 is provided downstream of the heat exchanger 14 for connection with the inlet of the capillary tube 91 of the regenerative capillary tube to be tested. The capillary tube inlet line 15 receives the high pressure, normal temperature refrigerant liquid from the heat exchanger 14 output.
A second detection device 16 is provided on the capillary feed line 15 for detecting the temperature and pressure of the fluid. Namely, the second detecting device 16 detects the temperature and pressure of the high-pressure, normal-temperature refrigerant liquid.
In particular in the present embodiment, the second detection device 16 comprises a temperature sensor and a pressure sensor.
The capillary output line 17 is adapted to communicate with the outlet of the capillary 91. After the capillary tube 91 throttles and depressurizes, the gas-liquid mixture is output from the outlet of the capillary tube 91, and after entering the capillary tube output pipeline 17, the liquid is also converted into gas by heat absorption.
A third detection device 18 is arranged on the capillary output line 17 for detecting the temperature and pressure of the fluid. I.e. the third detection device 18 is used for detecting the temperature and pressure of the gas.
In particular in the present embodiment, the third detection device 18 comprises a temperature sensor and a pressure sensor.
The return air inlet line 19 connects the capillary outlet line 17 to the inlet of the return air line 92. Into the return air inlet line 19, is already substantially gaseous.
A fourth detecting device 20 is provided on the return air input line 19 for detecting the temperature and pressure of the fluid. I.e. the fourth detection device 20 is used for detecting the temperature and pressure of the gas.
In the present embodiment in particular, the fourth detection device 20 includes a temperature sensor and a pressure sensor.
Since the air return pipe 92 is on the low pressure side, the pressure change between the inlet and the outlet of the air return pipe 92 is not large, and thus the first detecting device 12 and the fourth detecting device 20 may detect only one pressure. In the present embodiment, the first detecting device 12 and the fourth detecting device 20 each detect the pressure. In other embodiments, only the fourth detection device 20 may detect the pressure.
The heat exchange performance of the regenerative capillary tube to be measured can be obtained according to the data detected by the first detecting device 12, the second detecting device 16, the third detecting device 18 and the fourth detecting device 20 respectively.
The respective enthalpy values are calculated by measuring the temperatures and pressures of the inlet and outlet of the capillary tube 91 and the return air tube 92, respectively, to calculate the temperature efficiency epsilon.
The calculation formula is as follows:
ε＝(h c,i －h c,o )/(h s,i －h s,o )，
h represents the enthalpy, c represents the capillary, s represents the muffler, i represents the inlet, and o represents the outlet.
The enthalpy value is confirmed by the detected temperature and pressure. Specifically, after confirming the temperature and pressure of the refrigerant, the corresponding enthalpy value is found on the pressure-enthalpy diagram of the refrigerant according to the temperature and pressure.
Further, the heat exchange performance test apparatus further includes a flow meter 21 disposed between the compressor 13 and the heat exchanger 14 for metering the fluid.
Specifically, the flow meter 21 is a mass flow meter.
The flow rate measured by the flow meter 21 is combined with the length of the regenerative capillary tube to calculate the heat exchange quantity Q' of unit length, and the specific formula is as follows:
Q′＝m(h c,i －h c,o )/L，
m represents mass flow and L represents the length of the regenerative capillary tube.
The steady state performance of the regenerative capillary tube is quantitatively evaluated through two indexes of temperature efficiency epsilon and heat exchange quantity Q' per unit length, and the accuracy of evaluating the regenerative capillary tube is improved.
Further, the heat exchange performance test device further comprises a first heat exchanger 22 arranged between the heat exchanger 14 and the capillary feed line 15.
The first heat exchanger 22 comprises a first channel and a second channel capable of exchanging heat with each other, and a first thermostatic device 221. The first channel is for refrigerant flow, the second channel is for refrigerant flow, and the inlet and outlet of the second channel are in communication with the inlet and outlet of the first thermostatic device 221.
In particular in this embodiment, the first thermostatic device 221 employs a thermostatic water bath. By adjusting the temperature of the first thermostat 221, the temperature of the cooling medium is adjusted, and thus the refrigerant is condensed under different condensation conditions.
The heat exchange performance testing device can meet different testing tools through the arrangement of the first heat exchanger 22, and the universality of the heat exchange performance testing device is further improved.
Preferably, a first temperature sensor 225 is further disposed upstream of the first heat exchanger 22, and a second temperature sensor 226 is further disposed downstream of the first heat exchanger 22 to detect the problems of the fluid at the inlet and the fluid at the outlet, so as to better regulate the temperature of the first thermostatic device 221 and better meet the requirements of the working condition.
The heat exchange performance test apparatus further includes a second heat exchanger 23 disposed between the third detecting device 18 and the fourth detecting device 20. The second heat exchanger 23 includes a refrigerating passage through which a refrigerant flows and a medium passage through which a refrigerant flows, which are capable of exchanging heat with each other, and a second thermostat 231, and an inlet and an outlet of the medium passage are communicated with an inlet and an outlet of the second thermostat 231.
In particular, in this embodiment, the second thermostatic device 231 employs a thermostatic water bath. By adjusting the temperature of the second thermostat 231, the temperature of the cooling medium is adjusted, and thus the evaporation of the refrigerant under different evaporation conditions is adjusted.
The heat exchange performance testing device can meet different testing tools through the arrangement of the second heat exchanger 23, and the universality of the heat exchange performance testing device is further improved.
The heat exchange performance test apparatus further includes a supercooling degree adjusting device 24 disposed between the heat exchanger 14 and the capillary tube input line 15, for adjusting the supercooling degree of the fluid entering the capillary tube 91, further increasing the versatility of the heat exchange performance test apparatus. In the present embodiment in particular, the supercooling degree adjustment apparatus 24 is disposed downstream of the second temperature sensor 226.
Wherein the temperature adjustment of the supercooling degree adjustment apparatus 24 is achieved by an electric heater.
The heat exchange performance testing apparatus further includes a superheat adjusting device 25 disposed between the third detecting device 18 and the fourth detecting device 20, so as to adjust the superheat of the fluid entering the muffler 92, thereby further increasing the versatility of the heat exchange performance testing apparatus.
Wherein the temperature adjustment of the superheat adjusting device 25 is achieved by means of an electric heater.
In particular, in the present embodiment, the superheat adjustment device 25 is located downstream of the second heat exchanger 23.
The heat exchange performance test device also includes a view mirror 26. A sight glass 26 is provided at the inlet of the capillary feed line 15 for observing the level of the refrigerant.
The heat exchange performance test device further includes a dry filter 27. A filter drier 27 is provided upstream of the capillary tube inlet line 15 for filtering the refrigerant entering the capillary tube 91 to avoid clogging the capillary tube 91. Specifically, in the present embodiment, the dry filter 27 is disposed downstream of the liquid-viewing mirror 26.
In this embodiment, the flow direction of the refrigerant is as follows:
the refrigerant gas passes through the return gas output line 11 from the return gas pipe 92 to the compressor 13, and the temperature of the refrigerant gas is detected when the refrigerant gas passes through the return gas output line 11. The compressor 13 pressurizes the refrigerant gas and sends the gas to the heat exchanger 14, and the mass of the gas is measured by the flowmeter 21. The gas is liquefied by heat radiation and cooling when passing through the heat exchanger 14.
The liquid output from the heat exchanger 14 enters the first heat exchanger 14, and the temperature of the first thermostatic device 221 can be adjusted at this time if the heat exchange performance under different working conditions needs to be tested.
The liquid output by the first heat exchanger 14 enters the supercooling degree adjustment apparatus 24. The degree of supercooling is selected as desired.
Then, the liquid passes through the dry filter 27 and enters the capillary tube input line 15, then enters the capillary tube 91, and enters the capillary tube output line 17 after being throttled and depressurized by the capillary tube 91. The temperature and pressure of the liquid are sensed on capillary inlet line 15 and the temperature and pressure of the gas are sensed on capillary outlet line 17.
The gas continues to the second heat exchanger 14. If the heat exchange performance under different working conditions needs to be tested, the temperature of the second constant temperature equipment 231 can be adjusted at the moment.
The liquid output from the second heat exchanger 14 enters the superheat adjustment device 25. The degree of superheat is selected as required.
The gas output by the superheat degree enters the return gas input pipeline 19, and the temperature and the pressure of the gas are tested on the return gas input pipeline 19.
Finally, the gas returns to the capillary 91.
The heat exchange performance testing device in the embodiment can form a complete passage for fluid to flow with the regenerative capillary tube to be tested. In the path, the data of the inlet and the outlet of the capillary tube 91 are detected, and the data of the inlet and the outlet of the air return pipe 92 are calculated to obtain the temperature efficiency epsilon of the regenerative capillary tube, thereby obtaining the heat exchange performance of the regenerative capillary tube.
And the heat exchange quantity Q 'in unit length can be calculated simultaneously by measuring the flow, and the steady-state performance of the regenerative capillary tube can be quantitatively evaluated by two indexes of the temperature efficiency epsilon and the heat exchange quantity Q' in unit length, so that the accuracy of evaluating the regenerative capillary tube is improved.
Further, the heat exchange performance under different working conditions can be tested by adjusting different conditions through the first heat exchanger 22, the second heat exchanger 23, the supercooling degree adjusting device 24 and the superheat degree adjusting device 25, so that the universality of the heat exchange performance testing device is improved.
While the utility model has been described with reference to several exemplary embodiments, it is to be understood that the terminology used is intended to be in the nature of words of description and of limitation. As the present utility model may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.
Claims (10)
1. The utility model provides a heat transfer performance testing arrangement of backheating capillary, backheating capillary includes capillary and muffler, its characterized in that, heat transfer performance testing arrangement includes:
the return air output pipeline is used for being communicated with an outlet of an air return pipe of the heat return capillary tube to be tested;
the first detection device is arranged on the air return output pipeline and is used for detecting the temperature of the fluid;
the compressor is arranged at the downstream of the return air output pipeline;
a heat exchanger disposed downstream of the compressor;
the capillary tube input pipeline is arranged at the downstream of the heat exchanger and is used for being connected with the inlet of the capillary tube of the heat recovery capillary tube to be tested;
the second detection device is arranged on the capillary input pipeline and is used for detecting the temperature and the pressure of the fluid;
a capillary output line for communicating with an outlet of the capillary;
the third detection device is arranged on the capillary output pipeline and is used for detecting the temperature and the pressure of the fluid;
the return air input pipeline is connected with the capillary output pipeline and the inlet of the return air pipe;
the fourth detection device is arranged on the return air input pipeline and is used for detecting the temperature and the pressure of the fluid;
the heat exchange performance of the heat recovery capillary tube to be detected can be obtained according to data detected by the first detection device, the second detection device, the third detection device and the fourth detection device respectively.
2. The heat exchange performance test device of a regenerative capillary tube according to claim 1, wherein the heat exchanger is a fin-tube heat exchanger;
the heat exchanger comprises an air inlet and an air outlet, and a condensing fan is arranged in the flowing direction of air in and out.
3. The regenerative capillary tube heat exchange performance test device of claim 1, further comprising a flow meter disposed between the compressor and the heat exchanger for metering fluid.
4. The regenerative capillary tube heat exchange performance test device of claim 1, further comprising a first heat exchanger disposed between the heat exchanger and the capillary tube input line;
the first heat exchanger comprises a first channel and a second channel which can exchange heat with each other, and a first constant temperature device, wherein the first channel is used for flowing refrigerant, the second channel is used for flowing cooling medium, and the inlet and the outlet of the second channel are communicated with the inlet and the outlet of the first constant temperature device.
5. The heat exchange performance test device of a regenerative capillary tube according to claim 4, wherein a first temperature sensor is further provided upstream of the first heat exchanger, and a second temperature sensor is further provided downstream of the first heat exchanger.
6. The heat exchange performance test device of a regenerative capillary tube according to claim 1, further comprising a second heat exchanger disposed between the third detection device and the fourth detection device;
the second heat exchanger comprises a refrigeration channel and a medium channel which can exchange heat with each other, and second constant temperature equipment, wherein the refrigeration channel is used for flowing refrigerant, the medium channel is used for flowing the refrigerant, and the inlet and the outlet of the medium channel are communicated with the inlet and the outlet of the second constant temperature equipment.
7. The heat exchange performance test device of a regenerative capillary tube according to claim 1, further comprising a supercooling degree adjustment means disposed between the heat exchanger and the capillary tube input line for adjusting the supercooling degree of the fluid entering the capillary tube;
the temperature regulation of the supercooling degree regulating device is realized by an electric heater.
8. The heat exchange performance test device of a regenerative capillary tube according to claim 1, further comprising a superheat adjustment device provided between the third detection device and the fourth detection device for adjusting a superheat of the fluid entering the muffler;
the temperature of the superheat adjusting device is adjusted by an electric heater.
9. The heat exchange performance test device of a regenerative capillary tube according to claim 1, further comprising a liquid viewing mirror disposed at an inlet of the capillary tube input line;
the heat exchange performance testing device further comprises a dry filter, and the dry filter is arranged at the upstream of the capillary tube input pipeline.
10. The heat exchange performance test device of a regenerative capillary tube according to claim 1, wherein the first detection device comprises a temperature sensor, and the second detection device, the third detection device and the fourth detection device each comprise a temperature sensor and a pressure sensor;
the first detection device further comprises a pressure sensor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202223440315.7U CN219511810U (en) | 2022-12-21 | 2022-12-21 | Heat exchange performance testing device of backheating capillary tube |
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| CN202223440315.7U CN219511810U (en) | 2022-12-21 | 2022-12-21 | Heat exchange performance testing device of backheating capillary tube |
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| CN202223440315.7U Active CN219511810U (en) | 2022-12-21 | 2022-12-21 | Heat exchange performance testing device of backheating capillary tube |
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