CN107907321B - Heat leakage testing device and using method thereof - Google Patents
Heat leakage testing device and using method thereof Download PDFInfo
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- CN107907321B CN107907321B CN201711349955.8A CN201711349955A CN107907321B CN 107907321 B CN107907321 B CN 107907321B CN 201711349955 A CN201711349955 A CN 201711349955A CN 107907321 B CN107907321 B CN 107907321B
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- 238000012360 testing method Methods 0.000 title claims abstract description 57
- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000007788 liquid Substances 0.000 claims abstract description 56
- 238000009413 insulation Methods 0.000 claims abstract description 48
- 239000012530 fluid Substances 0.000 claims abstract description 12
- 239000007789 gas Substances 0.000 claims description 20
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 10
- 239000000843 powder Substances 0.000 claims description 9
- 239000011555 saturated liquid Substances 0.000 claims description 9
- 238000012937 correction Methods 0.000 claims description 6
- 229920006395 saturated elastomer Polymers 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 5
- 238000004891 communication Methods 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 3
- 230000008016 vaporization Effects 0.000 claims description 3
- 238000009834 vaporization Methods 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 2
- 238000004364 calculation method Methods 0.000 abstract description 4
- 239000004964 aerogel Substances 0.000 description 4
- 238000001514 detection method Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical group [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
Abstract
The invention discloses a heat leakage testing device and a using method thereof, wherein the device comprises a first heat insulation container, a second heat insulation container, a liquid medium source, a gaseous medium source, a liquid level meter and a flowmeter, wherein the first heat insulation container is arranged in the second heat insulation container, a valve cover assembly of a low-temperature valve is arranged in the second heat insulation container, the liquid medium source provides liquid medium for the first heat insulation container, the gaseous medium source provides gaseous medium for the first heat insulation container, the flowmeter is communicated with the first heat insulation container, the device further comprises a temperature sensor for measuring the temperature of fluid flowing into the flowmeter from the first heat insulation container and a pressure sensor for measuring the pressure of fluid flowing into the flowmeter from the first heat insulation container, and the temperature sensor and the pressure sensor are connected with a processor and are used for transmitting detected temperature signals and pressure signals to the processor for exchange calculation. The heat leakage testing device and the using method thereof can effectively test the heat leakage quantity of low-temperature valves.
Description
Technical Field
The invention relates to the technical field of low-temperature equipment testing, in particular to a heat leakage testing device and a using method thereof.
Background
By heat leak is meant the heat transferred from the surrounding environment to the medium in the cryogenic device per unit time, which, for a cryogenic valve, the amount of heat leakage refers to the amount of heat transferred from the ambient environment to the operating medium in its flow path through the cryogenic valve per unit time. In the prior art, a large amount of low-temperature liquid is needed to meet the production and scientific research demands, and a low-temperature valve is a common and important component in a plurality of low-temperature devices, the use environment temperature is lower than normal temperature or far lower than normal temperature, which requires the low-temperature valve to resist the low temperature in the working environment and has small heat leakage. Thus, the first and second substrates are bonded together, the test of the heat leakage quantity of the low-temperature valve has very important significance for ensuring the normal work of the low-temperature valve in a low-temperature environment. At present, no related low-temperature valve heat leakage testing device can accurately measure heat leakage, and most of the devices are simulated by a software simulation method.
In view of this, the present designer actively researches and innovates based on the practical experience and expertise which are rich for many years in such product engineering applications, and cooperates with the application of the theory, so as to create a heat leakage testing device and the use method thereof, which make the heat leakage testing device more practical.
Disclosure of Invention
The invention mainly aims to provide a heat leakage testing device and a using method thereof, which can accurately test the heat leakage of a low-temperature valve and have more use value.
The utility model provides a heat leakage testing arrangement, including first thermal-insulated container, the second thermal-insulated container, the liquid medium source, gaseous medium source, the level gauge and flowmeter, first thermal-insulated container sets up in the second thermal-insulated container, the valve gap subassembly of survey cryogenic valve is arranged in the second thermal-insulated container, and the access & exit that is located on the valve gap subassembly all communicates with first thermal-insulated container, the liquid medium source is in communication with first thermal-insulated container through the first valve that is located the pipeline, be used for providing liquid medium to first thermal-insulated container, gaseous medium source is in communication with first thermal-insulated container through the second valve that is located the pipeline, be used for providing gaseous medium to first thermal-insulated container, the flowmeter is in communication with first thermal-insulated container through flowmeter protection valve, be used for measuring the fluid mass flow or the volumetric flow that first thermal-insulated container flows out;
the system further comprises a temperature sensor for measuring the temperature of the fluid flowing into the flowmeter from the first heat-insulating container and a pressure sensor for measuring the pressure of the fluid flowing into the flowmeter from the first heat-insulating container, wherein the temperature sensor and the pressure sensor are connected with the processor and used for transmitting detected temperature signals and pressure signals to the processor for processing, a gas discharge pipeline is arranged between the first heat-insulating container and the flowmeter, and a flowmeter branch valve is arranged on the gas discharge pipeline.
Further, a first auxiliary temperature sensor is arranged on the surface of the valve cover assembly and is used for detecting the temperature of the surface of the valve cover assembly; the outer surface of the first heat-insulating container is provided with a second auxiliary temperature sensor for detecting the temperature of the outer surface of the first heat-insulating container, and all detected temperature values are transmitted to the processor.
Further, the first heat-insulating container is a liquid nitrogen Dewar, and heat-insulating paper is wrapped on the outer wall of the liquid nitrogen Dewar.
Further, the second heat-insulating container is a heat-insulating dewar with a vacuum cavity, and heat-insulating powder is filled in the inner wall of the heat-insulating dewar.
Further, a spiral area is arranged on a connecting pipeline of the first heat-insulating container and the flowmeter, the spiral area comprises a first spiral area and/or a second spiral area, the first spiral area is arranged in the second heat-insulating container, and the second spiral area is arranged outside the second heat-insulating container.
Further, the liquid medium source and the gaseous medium source are communicated with the first heat insulation container through a first pipeline and a second pipeline which are connected with the main pipeline.
The application method based on the heat leakage testing device comprises the following steps:
1) Installing a tested low-temperature valve on a heat leakage testing device, and vacuumizing the inner cavity of the second heat insulation container to the standard requirement;
2) Closing the first valve and the flowmeter protecting valve, opening the second valve and the flowmeter branch valve, and introducing gaseous medium into the first heat-insulating container so that the gaseous medium is discharged through the flowmeter branch valve;
3) Closing the second valve, opening the first valve, introducing liquid medium into the first heat-insulating container, detecting the liquid level height of the liquid medium through the liquid level meter, and stopping providing the liquid medium when the liquid level height is up to the required liquid level height;
4) Opening a flowmeter protection valve to close a flowmeter branch valve, changing the liquid medium into a gaseous medium due to the leakage and heat of a measured low-temperature valve, discharging the gaseous medium through the flowmeter, and recording mass flow readings or volume flow readings of the flowmeter in a preset time period after the airflow is stable;
5) When liquid medium is introduced into the first heat-insulating container and the reading of the flowmeter is stable, detecting and recording the temperature and pressure of the low-temperature medium gas flowing into the flowmeter, and transmitting all detected data to a processor to calculate the heat leakage. Further, the calculation method of the heat leakage amount is as follows:
a. when the flowmeter adopts volume flow data record, the heat leakage is calculated according to the following formula (A):
wherein:
Q 0 -testing for heat leakage in watts (W);
G V the daily average of the volume flow of the vaporized gas is given in cubic meters per second (m 3 /s)；
Psi is a correction coefficient of the flowmeter, and a given value is set during calibration;
ρ g gas density of test medium at standard atmospheric pressure (101.325 KPa), 273.15K in kilograms per cubic meter (kg/m) 3 )；
ρ v Saturated vapor density of test medium at daily average of experimental ambient pressure in kilograms per cubic meter (kg/m 3 )；
ρ L -the saturated liquid density of the test medium at the daily average of the experimental ambient pressure in kilograms per cubic meter (kg/m 3);
t-the average value of flow meter inlet Wen Duri in Kelvin (K);
p-daily average of flowmeter inlet pressure in megapascals (MPa);
h fg -the latent heat of vaporization of the saturated liquid at the daily average value of the pressure at the inlet of the flowmeter, in kilojoules per kilogram (KJ/Kg);
b. when the flowmeter adopts mass flow data record, the heat leakage is calculated according to the following formula (B):
wherein:
Q 0 -testing for heat leakage in watts (W);
G m -daily average of the evaporated gas mass flow in kilograms per second (Kg/s);
ρ v saturated vapor density of test medium at daily average of experimental ambient pressure in kilograms per cubic meter (kg/m 3 )；
ρ L Saturated liquid density of test medium at daily average of experimental ambient pressure in kilograms per cubic meter (kg/m 3 )；
Psi is a correction coefficient of the flowmeter, and a given value is set during calibration;
the rest is as shown in formula (A).
After the technical scheme is adopted, the invention has the following beneficial effects:
the heat leakage testing device and the use method thereof can accurately test the heat leakage quantity of the low-temperature valve, completely replace a mode of obtaining a testing result through a software simulation method, provide a new way and a new method for testing the heat leakage quantity of the low-temperature valve, simultaneously ensure accurate testing data and effectively ensure the normal operation of the low-temperature valve in a low-temperature environment.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the present invention and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a heat leak testing apparatus;
reference numerals: a first insulated container 1, a second insulated container 2, a liquid medium source 3, a gaseous medium source 4, a liquid level meter 5, a flow meter 6, a temperature sensor 7, a pressure sensor 8, a processor 9, a first auxiliary temperature sensor 10, a second auxiliary temperature sensor 11, a first spiral zone 12, a second spiral zone 13, a main pipeline 14, a first pipeline 15, a second pipeline 16, a first valve 17, a second valve 18, a measured cryogenic valve 19, a valve cover assembly 20, and a flow meter bypass valve 22.
Detailed Description
The following description of the embodiments of the present invention will be made with reference to the accompanying drawings, in which it is evident that the embodiments described are only a few embodiments of the present invention. All other embodiments, which can be made by those skilled in the art without the inventive effort, are within the scope of the present invention based on the embodiments of the present invention.
The heat leakage testing device shown in fig. 1 comprises a first heat insulation container 1, a second heat insulation container 2, a liquid medium source 3, a gaseous medium source 4, a liquid level meter 5 and a flowmeter 6, wherein the first heat insulation container 1 is arranged in the second heat insulation container 2, a valve cover assembly 20 of a tested low-temperature valve 19 is arranged in the second heat insulation container 2, an inlet and an outlet on the valve cover assembly 20 are communicated with the first heat insulation container 1, the liquid medium source 3 is communicated with the first heat insulation container 1 through a first valve 17 positioned on a pipeline and is used for providing liquid medium for the first heat insulation container 1, the gaseous medium source 4 is communicated with the first heat insulation container 1 through a second valve 18 positioned on the pipeline and is used for providing gaseous medium for the first heat insulation container 1, and the flowmeter 6 is communicated with the first heat insulation container 1 through a flowmeter protection valve 21 and is used for measuring the mass flow or the volume flow of fluid flowing out of the first heat insulation container; the device also comprises a temperature sensor 7 for measuring the temperature of fluid flowing into the flowmeter 6 from the first heat-insulating container 1 and a pressure sensor 8 for measuring the pressure of fluid flowing into the flowmeter 6 from the first heat-insulating container 1, wherein the temperature sensor 7 and the pressure sensor 8 are connected with a processor 9 and are used for transmitting detected temperature signals and pressure signals to the processor 9 for processing, a gas discharge pipeline is arranged between the first heat-insulating container 1 and the flowmeter 6, and a flowmeter branch valve 22 is arranged on the gas discharge pipeline. The flowmeter 6 is provided with a flowmeter protection valve 21 and a flowmeter branch valve 22 in front, when the low-temperature medium is unstable, the flowmeter protection valve 21 is closed, the flowmeter branch valve 22 is opened, the low-temperature medium is discharged through a branch pipeline, and after the air flow is stable, the flowmeter protection valve 21 is opened, and the flowmeter branch valve 22 is closed for data detection.
In order to make the collection of the temperature more comprehensive and accurate, a first auxiliary temperature sensor 10 is provided on the surface of the valve cover assembly 20 for detecting the temperature of the surface of the valve cover assembly 20; the outer surface of the first heat-insulating container 1 is provided with a second auxiliary temperature sensor 11 for detecting the temperature of the outer surface of the first heat-insulating container 1, and all detected temperature values are transmitted to the processor 9 and are used as the basis of subsequent calculation together with temperature data acquired by the temperature sensor 7. The first auxiliary temperature sensor 10 is uniformly distributed with four detection points along the axial direction of the valve cover assembly 20 and is used for detecting different temperatures of different position surfaces of the valve cover assembly 20, so that the distribution condition of the temperature in a low temperature state can be monitored, and further the heat transmission condition can be obtained.
The first heat-insulating container 1 is a liquid nitrogen Dewar, the outer wall of the liquid nitrogen Dewar is wrapped with heat-insulating paper, the outer surface of the valve cover assembly 20 can be wrapped with heat-insulating paper, the heat-insulating paper is wrapped with 30 layers, and the purpose of wrapping the heat-insulating paper is to further reduce radiation heat leakage; the second heat-insulating container 2 is a heat-insulating dewar with a vacuum cavity, heat-insulating powder filled in the inner wall of the heat-insulating dewar can be vacuum pearlitic sand or aerogel powder, the aerogel powder can be aluminum aerogel powder or silicon aerogel powder, and when the vacuum pearlitic sand is adopted, a proper amount of metal powder can be mixed to improve the heat-insulating performance of the heat-insulating powder.
The connecting pipeline of the first heat-insulating container 1 and the flowmeter 6 is provided with a spiral region, the spiral region comprises a first spiral region 12 and a second spiral region 13, the first spiral region 12 is arranged in the second heat-insulating container 2, and the second spiral region 13 is arranged outside the second heat-insulating container 2. The first spiral area 12 can effectively prevent the liquid medium from being directly sprayed out of the flowmeter 6 along with the gas under an unstable state, effectively protect the flowmeter 6, and can also reduce the heat leakage of the outflow pipeline through heat exchange of the spiral area; the second spiral region 13 can buffer the gaseous fluid, so that the flow change of the gaseous fluid is stable, and the accuracy of the test result is improved; and meanwhile, the temperature of the low-temperature gas is reduced through heat exchange between the spiral area and normal-temperature air, so that the flowmeter 6 is further protected.
The liquid medium source 3 and the gaseous medium source 4 are both communicated with the first heat insulation container 1 through the first pipeline 15 and the second pipeline 16 which are connected with the main pipeline 14, in this embodiment, the liquid medium source 3 and the gaseous medium source 4 are the same medium, and the same main pipeline 14 can not cause any influence on the liquid medium source 3 and the gaseous medium source 4, but can save the arrangement of the pipelines and reduce the difficulty of pipe distribution.
The application method based on the heat leakage testing device comprises the following steps:
1) The low-temperature valve 19 to be tested is arranged on a heat leakage testing device, and the inner cavity of the second heat insulation container 2 is vacuumized to the standard requirement;
2) Closing the first valve 17 and the flowmeter protection valve 21, opening the second valve 18 and the flowmeter bypass valve 22, and introducing a gaseous medium into the first heat-insulating container 1 so that the gaseous medium is discharged through the flowmeter bypass valve 22, and introducing the gaseous medium firstly to exhaust air in the heat leakage testing device so as to avoid the influence of the air in the device on the test;
3) Closing the second valve 18, opening the first valve 17, introducing liquid medium into the first heat-insulating container 1, detecting the liquid level of the liquid medium by the liquid level meter 5, and stopping supplying the liquid medium when the liquid level reaches the required liquid level;
4) The flowmeter protection valve 21 is opened, the flowmeter branch circuits 22 are closed, the liquid medium is changed into gaseous medium due to the leakage of the measured low-temperature valve 19 and is discharged through the flowmeter 6, and the mass flow reading or the volume flow reading of the flowmeter 6 in 24 hours is recorded after the air flow is stable.
5) When the liquid medium is introduced into the first heat-insulating container 1 and the reading of the flowmeter 6 is stable, the temperature and the pressure of the low-temperature medium gas flowing into the flowmeter 6 are detected and recorded, and all the detected data are transmitted to the processor 9 to calculate the heat leakage, and the calculation method is as follows:
a. when the flow meter 6 employs the volume flow data recording, the heat leak amount is calculated as follows:
wherein:
Q 0 -testing for heat leakage in watts (W);
G V the daily average of the volume flow of the vaporized gas is given in cubic meters per second (m 3 /s)；
Psi is a correction coefficient of the flowmeter, and a given value is set during calibration;
ρ g gas density of test medium at standard atmospheric pressure (101.325 KPa), 273.15K in kilograms per cubic meter (kg/m) 3 )；
ρ v Saturated vapor density of test medium at daily average of experimental ambient pressure in kilograms per cubic meter (kg/m 3 )；
ρ L -the saturated liquid density of the test medium at the daily average of the experimental ambient pressure in kilograms per cubic meter (kg/m 3);
t-the average value of flow meter inlet Wen Duri in Kelvin (K);
p-daily average of flowmeter inlet pressure in megapascals (MPa);
h fg -the latent heat of vaporization of the saturated liquid at the daily average value of the pressure at the inlet of the flowmeter, in kilojoules per kilogram (KJ/Kg);
b. when the flowmeter (6) adopts mass flow data record, the heat leakage is calculated according to the following formula (B):
wherein:
Q 0 -test for leakage of heat in watts(W)；
G m -daily average of the evaporated gas mass flow in kilograms per second (Kg/s);
ρ v saturated vapor density of test medium at daily average of experimental ambient pressure in kilograms per cubic meter (kg/m 3 )；
ρ L Saturated liquid density of test medium at daily average of experimental ambient pressure in kilograms per cubic meter (kg/m 3 )；
Psi is a correction coefficient of the flowmeter, and a given value is set during calibration;
the rest is as shown in formula (A).
Claims (8)
1. A heat leakage testing device is characterized by comprising a first heat insulation container (1), a second heat insulation container (2), a liquid medium source (3), a gaseous medium source (4), a liquid level meter (5) and a flowmeter (6), wherein the first heat insulation container (1) is arranged in the second heat insulation container (2), a valve cover assembly (20) of a tested cryogenic valve (19) is arranged in the second heat insulation container (2), an inlet and an outlet on the valve cover assembly (20) are communicated with the first heat insulation container (1), the liquid medium source (3) is communicated with the first heat insulation container (1) through a first valve (17) arranged on a pipeline and used for providing liquid medium for the first heat insulation container (1), the gaseous medium source (4) is communicated with the first heat insulation container (1) through a second valve (18) arranged on the pipeline and used for providing gaseous medium for the first heat insulation container (1), and the flowmeter (6) is communicated with the first heat insulation container (1) through a flowmeter protection valve (21) and used for measuring the first heat insulation volume flow or the first heat insulation container heat insulation flow;
the device also comprises a temperature sensor (7) for measuring the temperature of fluid flowing into the flowmeter (6) from the first heat-insulating container (1) and a pressure sensor (8) for measuring the pressure of fluid flowing into the flowmeter (6) from the first heat-insulating container (1), wherein the temperature sensor (7) and the pressure sensor (8) are both connected with the processor (9) and are used for transmitting detected temperature signals and pressure signals to the processor (9) for processing, a gas discharge pipeline is arranged between the first heat-insulating container (1) and the flowmeter (6), and a flowmeter branch valve (22) is arranged on the gas discharge pipeline.
2. The leakage heat testing device according to claim 1, wherein a first auxiliary temperature sensor (10) is provided on a surface of the valve cover assembly (20) for detecting a temperature of the surface of the valve cover assembly (20); the outer surface of the first heat-insulating container (1) is provided with a second auxiliary temperature sensor (11) for detecting the temperature of the outer surface of the first heat-insulating container (1), and all detected temperature values are transmitted to the processor (9).
3. The leakage testing device according to claim 1, characterized in that the first heat-insulating container (1) is a liquid nitrogen dewar, the outer wall of which is wrapped with heat-insulating paper.
4. The leakage heat testing device according to claim 1, wherein the second heat insulation container (2) is a heat insulation dewar with a vacuum cavity, and heat insulation powder is filled in the inner wall of the heat insulation dewar.
5. The leakage heat testing device according to claim 1, characterized in that a spiral zone is arranged on the connection pipeline of the first heat insulation container (1) and the flowmeter (6), the spiral zone comprises a first spiral zone (12) and/or a second spiral zone (13), the first spiral zone (12) is arranged in the second heat insulation container (2), and the second spiral zone (13) is arranged outside the second heat insulation container (2).
6. The leakage heat testing device according to claim 1, wherein the liquid medium source (3) and the gaseous medium source (4) are both in communication with the first thermally insulated container (1) via a first pipeline (15) and a second pipeline (16) connected to the main pipeline (14).
7. A method of using the leak testing apparatus of claim 2, comprising the steps of:
1) The tested low-temperature valve (19) is arranged on a heat leakage testing device, and the inner cavity of the second heat insulation container (2) is vacuumized to the standard requirement;
2) Closing the first valve (17) and the flowmeter protection valve (21), opening the second valve (18) and the flowmeter bypass valve (22), and introducing gaseous medium into the first heat-insulating container (1) so that the gaseous medium is discharged through the flowmeter bypass valve (22);
3) Closing the second valve (18), opening the first valve (17), introducing liquid medium into the first heat-insulating container (1), detecting the liquid level height of the liquid medium through the liquid level meter (5), and stopping providing the liquid medium when the liquid level height reaches the required liquid level height;
4) Opening the flowmeter protection valve (21) and closing the flowmeter branch valve (22), changing the liquid medium into a gaseous medium due to the heat leakage of the measured low-temperature valve (19) and discharging the gaseous medium through the flowmeter (6), and recording the mass flow reading or the volume flow reading of the flowmeter (6) in a preset time period after the air flow is stable;
5) When liquid medium is introduced into the first heat-insulating container (1) and the reading of the flowmeter (6) is stable, detecting and recording the temperature and pressure of the low-temperature medium gas flowing into the flowmeter (6), and transmitting all detected data to a processor (9) to calculate the heat leakage.
8. The method of claim 7, wherein the method of calculating the leakage heat is as follows:
a. when the flowmeter (6) adopts volume flow data record, the heat leakage is calculated according to the following formula (A):
wherein:
Q 0 -testing for heat leakage in watts (W);
G V the daily average of the volume flow of the vaporized gas is given in cubic meters per second (m 3 /s)；
Psi is a correction coefficient of the flowmeter, and a given value is set during calibration;
ρ g gas density of test medium at standard atmospheric pressure (101.325 KPa), 273.15K in kilograms per cubic meter (kg/m) 3 )；
ρ v Saturated vapor density of test medium at daily average of experimental ambient pressure in kilograms per cubic meter (kg/m 3 )；
ρ L -the saturated liquid density of the test medium at the daily average of the experimental ambient pressure in kilograms per cubic meter (kg/m 3);
t-the average value of flow meter inlet Wen Duri in Kelvin (K);
p-daily average of flowmeter inlet pressure in megapascals (MPa);
h fg -the latent heat of vaporization of the saturated liquid at the daily average value of the pressure at the inlet of the flowmeter, in kilojoules per kilogram (KJ/Kg);
b. when the flowmeter (6) adopts mass flow data record, the heat leakage is calculated according to the following formula (B):
wherein:
Q 0 -testing for heat leakage in watts (W);
G m -daily average of the evaporated gas mass flow in kilograms per second (Kg/s);
ρ v saturated vapor density of test medium at daily average of experimental ambient pressure in kilograms per cubic meter (kg/m 3 )；
ρ L Saturated liquid density of test medium at daily average of experimental ambient pressure in kilograms per cubic meter (kg/m 3 )；
Psi is a correction coefficient of the flowmeter, and a given value is set during calibration;
the rest is as shown in formula (A).
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| CN113281376B (en) * | 2021-04-22 | 2022-04-29 | 浙江大学 | Device and method for measuring deep low-temperature heat leakage rate of material |
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