KR101718636B1 - Apparatus for evaluating heating element with flow rate - Google Patents

Apparatus for evaluating heating element with flow rate Download PDF

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Publication number
KR101718636B1
KR101718636B1 KR1020150168292A KR20150168292A KR101718636B1 KR 101718636 B1 KR101718636 B1 KR 101718636B1 KR 1020150168292 A KR1020150168292 A KR 1020150168292A KR 20150168292 A KR20150168292 A KR 20150168292A KR 101718636 B1 KR101718636 B1 KR 101718636B1
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KR
South Korea
Prior art keywords
heating element
tube
temperature
measuring
fan
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KR1020150168292A
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Korean (ko)
Inventor
공영민
전신희
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울산대학교 산학협력단
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Priority to KR1020150168292A priority Critical patent/KR101718636B1/en
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Publication of KR101718636B1 publication Critical patent/KR101718636B1/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
    • G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K17/00—Measuring quantity of heat
    • G01K17/06—Measuring quantity of heat conveyed by flowing media, e.g. in heating systems e.g. the quantity of heat in a transporting medium, delivered to or consumed in an expenditure device
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
    • G01K7/02—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/0004—Gaseous mixtures, e.g. polluted air
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
    • G01R1/02—General constructional details
    • G01R1/06—Measuring leads; Measuring probes
    • G01R1/067—Measuring probes
    • G01R1/073—Multiple probes
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/10—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor
    • H05B3/12—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material
    • H05B3/14—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material the material being non-metallic
    • H05B3/141—Conductive ceramics, e.g. metal oxides, metal carbides, barium titanate, ferrites, zirconia, vitrous compounds

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  • General Physics & Mathematics (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Immunology (AREA)
  • General Health & Medical Sciences (AREA)
  • Biochemistry (AREA)
  • Pathology (AREA)
  • Analytical Chemistry (AREA)
  • Combustion & Propulsion (AREA)
  • Ceramic Engineering (AREA)
  • Food Science & Technology (AREA)
  • Medicinal Chemistry (AREA)
  • Investigating Or Analyzing Materials Using Thermal Means (AREA)

Abstract

The present invention relates to a heating body evaluation device, comprising: a tube of which both side surfaces are opened; a heating body disposed inside the tube; a fan forming a flow of fluid inside the tube; a plurality of probes applying a current and a voltage to the heating body, measuring the applied current, the applied voltage, and applied resistance; and a plurality of thermocouples measuring a temperature of the heating body.

Description

[0001] Apparatus for evaluating heating element with flow rate [

The present invention relates to a heating element evaluation apparatus, and more particularly, to an apparatus and a method for evaluating the characteristics of a SiC honeycomb heating element in accordance with a flow rate of a fluid flowing through a heating element.

SiC honeycomb type heating element is a very high efficiency ceramic heating element and is widely used for hair / hand dryer, oil / charcoal stove, electric instant boiler, gas / oil boiler, instantaneous water heater, cold water heater, washing machine drier, gas range, diesel particulate filter . Since the SiC honeycomb heating element has a feature of rapid heating (instant heating) by the SiC material and has a large surface area (contact area) characteristic due to the honeycomb shape, the heating efficiency is high and the heat exchanging efficiency is high, The liquid as well as the gas can be quickly heated with low power.

Table 1 shows the comparison between the metal heating element and the honeycomb SiC heating element. The honeycomb SiC heating element can improve the structure and material from the existing metal heating element to realize high power while saving energy.

Metal heating element Honeycomb SiC heating element material Fe-Cr SiC Size (mm) φ0.5 × 4500 φ37 × 20 shape coil Honeycomb Resistance (R 20 , Ω) 35 80 Surface area (mm2) 7,000 45,000

An object of the present invention is to provide an apparatus for evaluating a characteristic of a heating element according to a flow rate of a fluid flowing through the heating element.

In order to achieve the above-mentioned object, the present invention provides a tube having both sides open; A heating element disposed inside the tube; A fan forming a fluid flow within the tube; A plurality of probes for applying a current and a voltage to a heating element and measuring an applied current, voltage and resistance; And a plurality of thermocouples for measuring the temperature of the heating element.

An apparatus according to the present invention comprises: a fan support for supporting a fan; Guide rails; And a slider connected to the fan support and movable along the guide rail.

In the present invention, the flow rate or the flow rate of the fluid flowing inside the tube can be controlled by adjusting the rotation speed of the fan or adjusting the distance between the tube and the fan.

The apparatus according to the present invention may further comprise a detector which is installed at the inlet and outlet sides of the tube, respectively, and which measures the concentration or amount of the substance contained in the fluid.

In the present invention, both sides of the tube may be hermetically sealed, or the tube may be disposed in the hermetically closed chamber.

In the present invention, the thermocouple includes a first thermocouple for measuring the surface temperature in the longitudinal direction of the heating element, a second thermocouple for measuring the temperature of the left surface of the heating element, a third thermocouple for measuring the temperature of the right surface of the heating element, And a fourth thermocouple to measure.

In the present invention, the thermocouple may further include a fifth thermocouple that measures a second internal temperature of the heating element, and a sixth thermocouple that measures a third internal temperature of the heating element.

In the present invention, the first internal temperature is a temperature at a position corresponding to 10 to 20% of the length of the heating element from one end of the heating element, and the second internal temperature is a temperature at a position corresponding to 30 to 40% Temperature, and the third internal temperature may be a temperature at a position corresponding to 45 to 55% of the length of the heating element from one end of the heating element.

In the present invention, the heating element may be a SiC honeycomb heating element, and the fluid may be a waste gas containing contaminants.

The apparatus according to the present invention can measure the temperature of each part of the heating element and can evaluate the durability and the like. Further, the characteristics of the heating element can be evaluated according to the flow rate of the fluid flowing while passing through the heating element.

1 is a schematic configuration diagram of a heating element evaluation apparatus according to the present invention.
2 is a detailed view of the inside of a tube in the heating-element evaluation apparatus according to the present invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

2 is a detailed view of the inside of a tube in the heating-element evaluating apparatus according to the present invention. The apparatus according to the present invention includes a tube 10, a tube support 12 The fan 20, the guide rail 30, the slider 32, the heating element 40, the holders 42 and 44, the probes 50 and 52, the thermocouples 60 and 61 62, 63, 64, 65, and 66, detectors 70 and 72, and the like.

The tube 10 serves to receive the heating element 40 and to guide and guide the fluid flow. The fluid can be a gas, in particular a waste gas containing pollutants, and can be, for example, waste gases such as semiconductor manufacturing processes and liquid crystal display (LCD) manufacturing processes. The tube 10 may have an open structure with both sides open, and a door or the like may be provided on both sides of the tube 10 so as to have a closed structure. Further, the tube 10 may be disposed inside the hermetically closed chamber or the hood. When constructed in an enclosed manner, it is possible to prevent leakage of a fluid such as waste gas and to minimize the temperature change. A plurality of connection tubes and holes for forming the probes 50 and 52 and the thermocouples 60, 61, 62, 63, 64, 65 and 66 in the tube 10 are formed around the tube 10 . The tube 10 may be made of glass, plastic or the like, and may be transparent so that the inside can be seen from the outside. The tube 10 can be formed in a circular shape, and other shapes are possible. The size (diameter, length, etc.) of the tube 10 is not particularly limited and can be set appropriately.

The tube supports (12, 14) serve to support the tube (10). The tube supports 12, 14 may be adjustable in height, for example, a lower support in the form of a tube with an open top and an empty interior, an upper support to be vertically movably inserted into the lower support, And a screw-type stopper for fixing the upper support by tightening the rear screw. The tube supports 12 and 14 may be formed at the upper end of the upper support and may have a ring-shaped fixing base for fixing the tube 10 with both ends of the tube 10 inserted therein and a pedestal formed at the lower portion of the lower support have. The tube supports 12 and 14 can be made of metal and plastic, and the size thereof is not particularly limited and can be set appropriately.

The fan 20 serves to form a fluid flow inside the tube 10. The fluid flow formed by the fan 22 may flow into the interior of the tube 10 and then out through the exothermic body 40 and then out of the tube 10. The temperature of the inside of the tube 10 can be changed as the fluid flow is formed inside the tube 10 by the fan 20 and thus the characteristics of the heating element can be evaluated under the condition that the flow rate and the temperature of the fluid change. The fan 20 may be installed in close contact with the tube 10, or may be spaced apart at regular intervals. In particular, the fan 20 can be configured to be movable in the horizontal direction. Therefore, the flow rate or the flow rate of the fluid flowing inside the tube 10 can be adjusted by adjusting the rotation speed of the fan 20 or adjusting the distance (interval) between the tube 10 and the fan 20. The flow rate of the fluid can be adjusted, for example, in the range of 10 to 1000 L / min.

The fan support 22 serves to support the fan and can be connected with the fan 20 and moved together with the fan 20. [ The fan support 22 can also be configured to be adjustable in height in the same or similar manner as the tube supports 12 and 14 and can be made of metal and plastic and the size is not particularly limited and can be set appropriately .

The guide rail 30 and the slider 32 are means for moving the fan 20 and adjusting the distance between the tube 10 and the fan 20. The guide rail 30 has a pair of bar shapes And the cross section of the rod may be circular, polygonal, or the like. The guide rail 30 may be installed so as to be spaced apart from the floor surface by a plurality of supports. The upper portion of the slider 32 is connected to the fan support 22 and the lower portion of the slider 32 is mounted on the guide rail 30 to move along the guide rail 30. Accordingly, 10 and the fan 20 can be adjusted. The movement of the slider 32 can be performed both manually and manually.

The heating element 40 is an object to be evaluated. Preferably, the heating element 40 may be a SiC honeycomb ceramic heating element. The heating element 40 may be formed in a cylindrical shape as a whole, and the inside may have a porous structure such as a honeycomb. The heating element 40 may be composed only of SiC material, and may also include additives as required. As the additive, graphite, carbon, silicon, monazite, forzanlan, cordierite, alumina silicate and the like can be used. Silver paste serving as an electrode may be coated on both ends of the heating element 40. The heating element 40 is disposed inside the tube and can be supported by the holders 42 and 44.

The probes 50 and 52 serve to apply current and voltage to the heating element 40 and measure the applied current, voltage and resistance. The probes 50 and 52 can apply a current and a voltage to the heating element 40 to heat the heating element 40 and measure the current, voltage and resistance applied to the heating element 40. The first and second probes 50 and 52 may be installed in a plurality of, for example, two or more, and as illustrated in the figure, And may be installed so as to be in contact with both ends thereof. The probes 50 and 52 can be installed to be adjustable in position and can be connected to an external device through a hole formed in the tube 10 and a connection pipe.

The thermocouples 60, 61, 62, 63, 64, 65, and 66 serve to measure the temperature of the heating element 40. Preferably, the plurality of thermocouples 60, 61, 62, 63, 64, 65, and 66 may be provided. As illustrated in the drawings, the thermocouples 40, A second thermocouple 62 for measuring the temperature of the left side surface of the heating element 40; a third thermocouple 63 for measuring the temperature of the right side surface of the heating element 40; A fifth thermocouple 65 for measuring a second internal temperature of the heating element 40, a sixth thermocouple 66 for measuring a third internal temperature of the heating element 40, a fourth thermocouple 64 for measuring the internal temperature of the heating element 40, ≪ / RTI > Each of the thermocouples 60, 61, 62, 63, 64, 65, and 66 may be positionally adjustable and may be connected to an external device through a connection pipe and a hole formed in the tube 10.

The first internal temperature is a temperature at a position corresponding to 10 to 20% (L1) of the length L of the heating element from one end of the heating element 40. The second internal temperature is a temperature at one end of the heating element 40, And the third internal temperature is a temperature at a position corresponding to 45 to 55% (L3) of the length L of the heating element from one end of the heating element 40, Lt; / RTI > However, the temperature measurement position is not limited thereto, and can be variously changed as needed.

As described above, by providing the plurality of thermocouples 60, 61, 62, 63, 64, 65, and 66 and measuring the temperature of various portions of the heating body 40, the overall temperature distribution of the heating body 40 can be grasped and utilized (Such as durability) of the heating element 40 can be evaluated.

The detectors 70 and 72 serve to measure the concentration or the amount of the substance (contaminant or the like) contained in the fluid, and can be, for example, a gas sensor. It is possible to evaluate the pollutant treatment (removal) efficiency and the like by the heating element 40, for example, by measuring the concentration of the pollutant at the inlet and the outlet of the tube 10 through the detectors 70 and 72, respectively. The detectors 70 and 72 are respectively provided at the entrance and the exit of the tube 10, and the installation position, the number and the specifications thereof are not particularly limited.

The apparatus according to the present invention may include a control unit, a data logger or a digital recorder, a computer, a power supply, and the like, although it is not illustrated in the drawings.

The control unit can control the voltage (V), current (I), and resistance (R) applied to the heating element (40). The data logger or the digital recorder converts the temperature T, voltage V, current I and resistance R measured through the probes 50 and 52 and the thermocouples 60 to 66 ) And can be recorded. The computer may be connected to a control unit and a data logger to control them and process, output, and store data.

Further, the present invention provides a heating element evaluation method using the heating element evaluation apparatus described above.

According to one embodiment of the present invention, as the constant voltage mode, the temperature can be measured while changing the current at a constant voltage. According to another embodiment of the present invention, as the constant current mode, the temperature can be measured while varying the voltage at a constant current. In this manner, temperature measurement and evaluation according to voltage and current changes are also possible.

INDUSTRIAL APPLICABILITY As described above, the present invention can provide an apparatus and method for temperature measurement and durability evaluation of each SiC honeycomb heating body (surface portion in the cylindrical longitudinal direction, inside, left and right surfaces of the honeycomb). Particularly, the characteristics of the SiC honeycomb heating element can be evaluated according to the flow rate of the fluid flowing through the heating element.

10: Tube
12, 14: tube support
20: Fans
22: Fan support
30: Guide rail
32: Slider
40: heating element
42, 44: holder
50, 52: probes
60, 61, 62, 63, 64, 65, 66: thermocouple
70, 72: Detector

Claims (9)

A tube with both sides open;
A heating element disposed inside the tube;
A fan forming a fluid flow within the tube;
A plurality of probes for applying a current and a voltage to a heating element and measuring an applied current, voltage and resistance;
A first thermocouple for measuring a longitudinal surface temperature of the heating element;
A second thermocouple measuring the temperature of the left surface of the heating element;
A third thermocouple measuring the temperature of the right side surface of the heating element;
A fourth thermocouple for measuring a first internal temperature of the heating element;
A fifth thermocouple for measuring a second internal temperature of the heating element;
A sixth thermocouple for measuring a third internal temperature of the heating element;
A fan support for supporting the fan;
Guide rails; And
And a slider connected to the fan support and movable along the guide rail,
By adjusting the rotation speed of the fan or adjusting the distance between the tube and the fan, the flow rate or the flow rate of the fluid flowing inside the tube can be controlled,
The first internal temperature is a temperature at a position corresponding to 10 to 20% of the length of the heating element from one end of the heating element, the second internal temperature is a temperature at a position corresponding to 30 to 40% of the length of the heating element from one end of the heating element, The third internal temperature is a temperature at a position corresponding to 45 to 55% of the length of the heating element from one end of the heating element,
Wherein the heating element is an SiC honeycomb type ceramic heating element.
delete delete The method according to claim 1,
Further comprising a detector provided at the inlet and outlet sides of the tube, respectively, for measuring the concentration or amount of the substance contained in the fluid.
The method according to claim 1,
Wherein both sides of the tube are sealable or the tube is disposed in the hermetically closed chamber.
delete delete delete The method according to claim 1,
Wherein the fluid is a waste gas containing contaminants.
KR1020150168292A 2015-11-30 2015-11-30 Apparatus for evaluating heating element with flow rate KR101718636B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111596136A (en) * 2020-06-01 2020-08-28 渭南高新区木王科技有限公司 Probe fatigue impedance test machine

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06109674A (en) * 1992-09-24 1994-04-22 Snow Brand Milk Prod Co Ltd Measuring apparatus for fluid heat conductivity and method for measuring heat conductivity using the same
KR20010058258A (en) * 1999-12-27 2001-07-05 이구택 Apparatus for evaluating the crystallization characteristics of mold flux
KR20050024633A (en) * 2003-09-01 2005-03-11 학교법인 포항공과대학교 Apparatus and method for measuring heat dissipation
JP2010237005A (en) * 2009-03-31 2010-10-21 Yamatake Corp Gas physical property value measuring system, gas physical property value measuring method, heat value calculating formula forming system, heat value calculating formula forming method, heat value calculating system, and heat value calculating method

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06109674A (en) * 1992-09-24 1994-04-22 Snow Brand Milk Prod Co Ltd Measuring apparatus for fluid heat conductivity and method for measuring heat conductivity using the same
KR20010058258A (en) * 1999-12-27 2001-07-05 이구택 Apparatus for evaluating the crystallization characteristics of mold flux
KR20050024633A (en) * 2003-09-01 2005-03-11 학교법인 포항공과대학교 Apparatus and method for measuring heat dissipation
JP2010237005A (en) * 2009-03-31 2010-10-21 Yamatake Corp Gas physical property value measuring system, gas physical property value measuring method, heat value calculating formula forming system, heat value calculating formula forming method, heat value calculating system, and heat value calculating method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111596136A (en) * 2020-06-01 2020-08-28 渭南高新区木王科技有限公司 Probe fatigue impedance test machine

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