KR101655906B1 - Cryogenic effective thermal conductivity tester of insulation material - Google Patents

Cryogenic effective thermal conductivity tester of insulation material Download PDF

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Publication number
KR101655906B1
KR101655906B1 KR1020150080867A KR20150080867A KR101655906B1 KR 101655906 B1 KR101655906 B1 KR 101655906B1 KR 1020150080867 A KR1020150080867 A KR 1020150080867A KR 20150080867 A KR20150080867 A KR 20150080867A KR 101655906 B1 KR101655906 B1 KR 101655906B1
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KR
South Korea
Prior art keywords
heat
cryogenic liquid
support member
evaporation amount
heat insulating
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Application number
KR1020150080867A
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Korean (ko)
Inventor
강형묵
강상우
오인환
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한국과학기술연구원
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Priority to KR1020150080867A priority Critical patent/KR101655906B1/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N25/00—Investigating or analyzing materials by the use of thermal means
    • G01N25/18—Investigating or analyzing materials by the use of thermal means by investigating thermal conductivity
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N7/00—Analysing materials by measuring the pressure or volume of a gas or vapour

Abstract

The present invention relates to a cryogenic thermal conductivity tester of an insulation material. The cryogenic thermal conductivity tester of an insulation material comprises: a housing of a sealed structure forming an accommodation space in a vacuum state therein; a support member of a horizontal plate shape supported by a support part extended from an upper end of the housing, wherein an insulation material is installed below the same; an evaporation amount measurement unit which is positioned above the support member, receives heat entering through the insulation material from below, and evaporates by the received heat; and a heat absorbing unit which is positioned above the support member, accommodates the evaporation amount measurement unit in the middle of a lower surface thereof, and stores cryogenic liquid evaporated to block heat in all directions including heat transferred from a vertical direction of the insulation material.

Description

TECHNICAL FIELD [0001] The present invention relates to a cryogenic thermal conduction test apparatus,

The present invention relates to an apparatus for testing a cryogenic thermal conduction of a heat insulator, and more particularly, to an apparatus for testing a cryogenic thermal conduction of a heat insulator for testing the thermal conductivity of the heat insulator at a cryogenic temperature.

Due to the problem of air pollution and global warming caused by excessive use of fossil fuels, the development of systems using fuel rather than hydrocarbons has been actively underway at home and abroad. The most representative of these is the utilization of hydrogen energy.

In order to use hydrogen energy efficiently, it is necessary to reduce the volume and densify it, to make it easy to transport and store it, and to diversify applications. Among the methods of reducing the volume of hydrogen and storing it, it is the method of liquefying the hydrogen and storing it in liquid hydrogen form. Therefore, in order to expand the use of hydrogen energy, it is necessary to develop a low-temperature device capable of storing liquid hydrogen which is easy to store and transport.

In order to store the liquid at a low temperature, it is very important to insulate the storage vessel to minimize vaporization loss due to heat input from the outside.

However, conventionally, it is very difficult to grasp the heat insulating performance of the storage container, so that there is a problem that effective heat insulating performance evaluation is not performed.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide an apparatus for testing a cryogenic thermal conductivity of a heat insulating material capable of measuring the heat insulating performance by testing the thermal conductivity of the heat insulating material at a cryogenic temperature have.

In order to achieve the above object, the present invention provides an apparatus for testing a cryogenic thermal conductivity of a heat insulating material, the apparatus comprising: a housing having a sealed structure in which a receiving space in a vacuum state is formed; A horizontal plate-shaped support member supported by a support extending from an upper end of the housing and provided with a heat insulating material at a lower position; An evaporation amount measuring unit which is located at an upper portion with respect to the supporting member, receives heat received from the lower portion through the heat insulating member, and stores the cryogenic liquid evaporated by the transmitted heat; And a cryogenic liquid which is located at an upper portion with respect to the support member and accommodates the evaporation amount measurement portion in the center of the lower portion and is evaporated to block heat in all directions including heat transmitted from a vertical direction of the insulation And a heat absorbing portion.

According to the present invention, each of the evaporation amount measuring unit and the heat absorber is provided with a supply line for supplying the cryogenic liquid from the cryogenic liquid storage tank and a discharge line for discharging the evaporated cool air of the cryogenic liquid to the outside.

According to the present invention, the supply line and the discharge line are made of a flexible hose or a bellows-shaped elastic hose to facilitate length adjustment.

According to the present invention, the support base is supported by the support member and vertically connected to the upper end of the housing, so that the position of the support base can be adjusted by raising and lowering the support member.

According to the present invention, the height of the liquid surface of the cryogenic liquid stored in the heat absorber is kept higher than the upper height of the evaporation amount measuring unit.

According to the present invention, the heat absorber is provided with a liquid level sensor for checking the stored amount of the cryogenic liquid to be stored.

According to the present invention, the discharge line of the evaporation amount measurement unit is provided with a flow meter for measuring the flow rate of evaporation, and a vacuum pump is installed to check the performance of the insulation material while changing the degree of vacuum of the accommodation space in which the insulation material is accommodated. A regulating valve is provided on the supply line of the heat absorbing part for regulating the supply amount of the cryogenic liquid.

According to the apparatus for testing cryogenic thermal conductivity of a heat insulating material according to the present invention having the above-described constitution, it is possible to improve the reliability of the heat insulating material by judging property changes and stability through the heat insulating performance test of the heat insulating material at a cryogenic temperature.

In particular, it is possible to experiment while changing the degree of vacuum of the receiving space in which the heat insulating material is accommodated, so that it is possible to measure a comprehensive thermal conduction by conduction, radiation and convection according to vacuum conditions.

It is possible to adjust the height of the heat insulating part where the heat insulating material is installed.

1 is a perspective view showing an apparatus for testing a cryogenic thermal conductivity of a heat insulator according to the present invention.
2 is a cross-sectional view showing an apparatus for testing a cryogenic thermal conductivity of a heat insulating material according to the present invention.
3 is a cross-sectional perspective view illustrating an evaporation amount measurement unit and a heat absorption unit according to the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 1 to 3. FIG.

As shown in FIG. 1, the apparatus for testing the cryogenic temperature thermal conductivity of a heat insulating material includes a housing 100, an evaporation amount measuring unit 400, and a heat absorbing unit 500. In this configuration, Referring to FIG. 1, the housing 100 is a cylindrical closed structure having a housing space for accommodating a main component therein, and the inside of the housing 100 is maintained in a vacuum state. At this time, an opening is formed in the upper part of the housing 100 to facilitate the replacement of the heat insulating material i to be accommodated therein, and the upper part of the housing 100 is opened / closed by the lid part 110 .

A plate-shaped support member 200 is provided in the housing 100 in a horizontal direction and a support member 800 extending from the upper end of the housing 100 and supporting the support member 200 is installed.

A heat insulating material i to be tested is installed between the lower part of the receiving member 200 and the inner wall of the housing 100. The upper part of the receiving member 200 conveys heat flowing from the lower part through the heat insulating material i, An evaporation amount measuring unit 400 for storing a cryogenic liquid evaporated by the received heat is provided on the support member 200. Here, the support member 200 is preferably made of pure copper to increase the thermal conductivity.

The evaporation amount measuring unit 400 covers the upper and the side portions of the evaporation amount measuring unit 400 at the center of the lower surface of the evaporation amount measuring unit 400 and blocks heat in all directions including the heat transmitted from the vertical direction of the insulation unit i A heat absorbing portion 500 for storing a cryogenic liquid which is evaporated in order to heat the cryogenic liquid is provided on the supporting member 200.

The evaporation amount measurement unit 400 and the heat absorption unit 500 are stacked on the support member 200 in order.

The evaporation amount measuring unit 400 and the heat absorbing unit 500 are provided with supply lines 410 and 510 for supplying cryogenic liquid and discharge lines 420 and 520 for discharging evaporative cooling air of the cryogenic liquid to the outside.

The supply lines 410 and 510 are respectively connected to the cryogenic liquid storage tank T so that the cryogenic liquid is supplied to the evaporation amount measurement unit 400 and the heat absorption unit 500 respectively while the discharge lines 420 and 520 are evaporated And is exposed to the outside of the housing 100 such that cold air is discharged from the evaporation amount measurement unit 400 and the heat absorption unit 500 to the air.

In the evaporation amount measuring part 400, the cryogenic liquid is evaporated by the heat transmitted through the heat insulating material i, and the flow rate of the evaporated cryogenic liquid is measured to calculate the heat inflow amount of the heat insulating material (i) do. For this, a flow meter 600 is installed in the discharge lines 420 and 520 of the evaporation amount measuring unit 400 to measure the evaporation flow rate. A vacuum pump 700 is provided for checking the performance of the heat insulating material i while varying the degree of vacuum of the receiving space in which the heat insulating material i is accommodated. The evaporation amount measuring unit 400 and the heat absorbing unit 500 The control valves 411 and 511 are provided on the supply lines 410 and 510 for controlling the supply amount of the cryogenic liquid.

The height of the liquid surface of the cryogenic liquid stored in the heat absorber 500 is measured by the evaporation amount measuring unit 400 so as to block the heat loss emitted from the evaporation amount measuring unit 400 from the cryogenic liquid of the heat absorbing unit 500 It is preferable that it is always kept higher than the upper height. At this time, the liquid level sensor 530 is installed in the heat absorber 500 so that the stored amount of the cryogenic liquid stored in the heat absorber 500 can be confirmed and the constant amount can be maintained at all times.

In order to reduce the natural evaporation flow rate of the cryogenic liquid in the heat absorber 500, an auxiliary insulating material (not shown) is installed on the inner surface of the housing 100 and the upper and side surfaces of the heat absorber 500 do. This makes it possible to extend the insulation duration of the cryogenic liquid stored in the heat absorber 500.

3, the housing 100, the evaporation amount measuring unit 400, and the heat absorbing unit 500 may be formed as a closed cylinder in order to maintain a constant amount of heat inflow from the lateral direction desirable.

According to the apparatus for testing the thermal conductivity of the heat insulating material thus constructed, the thickness of the heat insulating material (i) installed in the lower part of the supporting member (200) in the housing (100) It is necessary to adjust the height of the installation part.

As described above, the supporting member 200 is preferably vertically adjusted so that the heat insulating material i can be installed on the heat insulating material mounting part without interference with the receiving member 200 without being restricted by the size of the heat insulating material i. A support unit 800 supported by the support member 200 and vertically connected to the support unit 120 fixed to the lower end of the lid unit 110 at the upper end of the housing 100 is provided. Here, the support part 120 is fixed to the upper end lid part 110 by fixing the other end of the support part 800 fixed at one end to the support part 200, 800, the structure of the supporting part 120 may be omitted.

The support member 800 is connected to the support member 200 and the support member 120 by fastening with the fastening member to adjust the position of the support member 200. By positioning the fastening member 200, Lt; / RTI >

In this way, when the height of the support member 200 is adjusted by the elevating operation of the support table 800, the height of the heat insulating material mounting portion is adjusted, so that the heat insulating material i having various heights can be set as an experimental object.

The supply lines 410 and 510 and the discharge lines 420 and 520 connected to the evaporation amount measuring unit 400 and the heat absorbing unit 500 installed on the support member 200 due to the height adjustment of the support table 800, The length of the supply lines 410 and 510 and the lengths of the discharge lines 420 and 520 may be easily adjusted because the length of the supply lines 410 and 510 is variable.

In order to confirm the heat insulating performance of the heat insulating material (i), the temperature of the portion contacting the lower end of the heat insulating material (i) must be kept constant in the apparatus for testing thermal conductivity of the heat insulating material according to the present invention. Therefore, a heater may be installed outside the housing 100 so that the temperature of the surface portion of the heat insulating material i can be kept constant, if necessary.

A rod-shaped temperature sensor 900 for measuring the temperature in the center and the radial direction of the heat insulating material i is provided in the lower part of the receiving member 200 for measuring the thermal conductivity of the heat insulating material i by temperature region. Are fixed in the heat insulating material (i). It is preferable that the temperature sensor 900 measures the temperature of the heat insulating material i on the premise that there is almost no radial temperature deviation of the heat insulating material i.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It should be understood that various modifications made by the person skilled in the art are also within the scope of protection of the present invention.

100: housing 110: cover
120: Support part 200: Support part
400: evaporation amount measurement part 500: heat absorption part
600: Flow meter 700: Vacuum pump
800: Support 900: Temperature sensor

Claims (7)

1. A vacuum cleaner comprising: a housing having a housing space formed therein with a vacuum structure capable of forming a vacuum; A horizontal plate-shaped support member supported by a support extending from an upper end of the housing and provided with a heat insulating material at a lower position; An evaporation amount measuring unit which is located at an upper portion with respect to the supporting member, receives heat received from the lower portion through the heat insulating member, and stores the cryogenic liquid evaporated by the transmitted heat; And a cryogenic liquid which is located at an upper portion with respect to the support member and accommodates the evaporation amount measurement portion in the center of the lower portion and is evaporated to block heat in all directions including heat transmitted from a vertical direction of the insulation And a heat absorbing portion,
Each of the evaporation amount measurement unit and the heat absorption unit is provided with a supply line for supplying the cryogenic liquid from the cryogenic liquid storage tank and a discharge line for discharging the evaporated cool air of the cryogenic liquid to the outside,
Wherein the height of the liquid surface of the cryogenic liquid stored in the heat absorber is kept higher than the height of the top of the evaporation amount measuring unit.
The method according to claim 1,
Wherein the supply line and the discharge line are made of any one of a flexible hose or a bellows-shaped elastic hose to facilitate length control.
The method according to claim 1,
Wherein the support base is supported by the support member and is vertically connected to the upper end of the housing to adjust the position of the support member by raising and lowering the support member.
The method according to claim 1,
Wherein a liquid level sensor is provided in the heat absorber for checking the stored amount of cryogenic liquid stored in the heat absorber.
The method according to claim 1,
A flow meter for measuring an evaporation flow rate is installed in a discharge line of the evaporation amount measurement unit,
A vacuum pump capable of forming a vacuum in the receiving space in which the heat insulating material is accommodated and verifying the performance of the heat insulating material while changing the degree of vacuum,
Wherein a control valve for controlling the supply amount of the cryogenic liquid is installed on the supply line of the evaporation amount measuring unit and the heat absorbing unit. delete delete
KR1020150080867A 2015-06-08 2015-06-08 Cryogenic effective thermal conductivity tester of insulation material KR101655906B1 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020218690A1 (en) * 2019-04-26 2020-10-29 서울대학교 산학협력단 Probe system for low-temperature high-precision heat transport measurement and measurement device including same
KR102287882B1 (en) * 2020-02-26 2021-08-09 부산대학교 산학협력단 System And Method for Test of Insulation Structure for Cryogenic Fluid Storage System
KR102656772B1 (en) 2023-11-20 2024-04-16 크라이오에이치앤아이(주) Heat transfer tester

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0415548A (en) * 1990-05-10 1992-01-20 Ohbayashi Corp Heat insulation testing method
WO2008085005A1 (en) * 2007-01-12 2008-07-17 Cryo-Nevico Inc. Tank for holding a cryogenic liquid and a conduit assembly, and a system for effecting flow control and pressure management of a cryogenic liquid held in the tank
KR20120059799A (en) * 2010-12-01 2012-06-11 한국기계연구원 A measuring device for thermal conductivity and thermal expansion coefficient at cryogenic temperature and method for simultaneous measurment of thermal conductivity and thermal expansion coefficient
KR20140106223A (en) * 2013-02-26 2014-09-03 인하대학교 산학협력단 Cryogenic Materials Laboratory Devices

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0415548A (en) * 1990-05-10 1992-01-20 Ohbayashi Corp Heat insulation testing method
WO2008085005A1 (en) * 2007-01-12 2008-07-17 Cryo-Nevico Inc. Tank for holding a cryogenic liquid and a conduit assembly, and a system for effecting flow control and pressure management of a cryogenic liquid held in the tank
KR20120059799A (en) * 2010-12-01 2012-06-11 한국기계연구원 A measuring device for thermal conductivity and thermal expansion coefficient at cryogenic temperature and method for simultaneous measurment of thermal conductivity and thermal expansion coefficient
KR20140106223A (en) * 2013-02-26 2014-09-03 인하대학교 산학협력단 Cryogenic Materials Laboratory Devices

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020218690A1 (en) * 2019-04-26 2020-10-29 서울대학교 산학협력단 Probe system for low-temperature high-precision heat transport measurement and measurement device including same
KR102287882B1 (en) * 2020-02-26 2021-08-09 부산대학교 산학협력단 System And Method for Test of Insulation Structure for Cryogenic Fluid Storage System
KR102656772B1 (en) 2023-11-20 2024-04-16 크라이오에이치앤아이(주) Heat transfer tester

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