KR20030092971A - A testing method and equipment of thermal conduction for plate glass - Google Patents

Abstract

PURPOSE: An apparatus and a method for testing thermal conductivity of plate glass are provided to precisely and easily measure thermal conductivity of plate glass by calculating thermal conductivity of plate glass using a contact area with respect to water and thickness of plate glass. CONSTITUTION: A thermal conductivity testing apparatus(100) includes a vessel(10), a cover(20), a temperature sensor(30), a data processing unit(40), and a display section(50). The vessel(10) is formed at a center thereof with an insertion hole(15), into which plate glass(200) is inserted. After the plate glass(200) is inserted into the insertion hole(15) of the vessel(10), two kinds of water having different temperatures from each other are contained in the vessel(10). The cover(20) is aligned at an upper portion of the vessel(10) in order to cover the vessel(10). The temperature sensor(30) measures the temperatures of water contained in the vessel(10) in real time.

Description

A testing method and equipment of thermal conduction for plate glass

The present invention relates to a method and apparatus for testing thermal conductivity of plate glass, and more particularly, it is possible to accurately and easily measure the thermal conductivity of plate glass used in a vehicle or a building. The present invention relates to a method and apparatus for testing the thermal conductivity of plate glass, which can help to study the thermal conductivity according to the ratio between the mixtures and to make the manufactured plate glass suitable for each application.

In general, glass refers to an object with high transparency produced by melting silica sand, sodium carbonate, calcium carbonate, etc. at high temperature and cooling it. have.

Such flat glass is large colorless transparent plain glass, patterned glass on one side and flat glass on the other side, wired plate glass with wire mesh inside, polished on both sides or one side of thick glass to smooth the permeation. Frosted glass, frosted glass with rough surface, colored glass with various colorants on one or both sides, laminated glass with plastic sandwiched between two or more plates, tempered glass with heat treatment In addition, the air layer is divided between two or more sheets of glass, and is divided into a multilayer glass having low thermal conductivity.

Plate glass having a variety of types as described above is applied in various ways depending on the use, and recently, when using the glass plate as a window of a building or a vehicle, not only simple functions such as sunshine control, but also complex functions such as insulation and insulation are required. have.

That is, a method of maximizing functions such as heat insulation and insulation by controlling thermal conductivity among various properties of glass is required. In the manufacturing process of glass, a special material is added or the mixing ratio between the additive and the glass raw material is adjusted. Research on the method of lowering the thermal conductivity through the research is in progress.

In order to proceed with the above research, first, methods or apparatuses for accurately measuring thermal conductivity of fragile building materials such as plate glass should be established.However, methods and apparatuses capable of accurately and easily measuring thermal conductivity are still available. There is a lack of technology in Korea, and therefore, studies on the thermal conductivity of plate glass are also insufficient.

Therefore, the present invention is configured to solve the above problems, it is possible to accurately and easily measure the thermal conductivity of the manufactured glass plate, and therefore to the addition rate of the material or the addition of these materials to improve the thermal conductivity of the glass The purpose of the present invention is to provide a method and apparatus for testing the thermal conductivity of plate glass, which can help to study the thermal conductivity according to the present invention and can use the manufactured plate glass appropriately for each use.

1 is a perspective view showing a thermal conductivity test apparatus of the plate glass of the present invention

2 is a cross-sectional view of a container of the thermal conductivity test apparatus of FIG.

Figure 3 is a flow chart showing a thermal conductivity test method of the plate glass of the present invention

<Description of the symbols for the main parts of the drawings>

100; Thermal conductivity test device

10; Vessel

15; Insert groove

20; cover

30; temperature Senser

40; Data processing device

50; Display

200; plate glass

The present invention to achieve the above object,

An insertion groove into which a plate glass to be measured for thermal conductivity is inserted is formed in the center portion, and a container formed so that the same volume of water at different temperatures can be stored at left and right sides after the plate glass is inserted;

A cover in close contact with the upper part of the container to seal the container;

A temperature sensor for measuring in real time the temperature of water stored in the left and right sides of the container;

A data processing device incorporating software for calculating thermal conductivity using temperature data measured by the temperature sensor according to time, water contact area and thickness of the plate glass input in advance, mass of the water used, and specific heat;

It can be achieved by providing an apparatus for testing the thermal conductivity of plate glass, characterized in that it comprises a display for displaying the thermal conductivity calculated by the data processing apparatus.

Hereinafter, the thermal conductivity test apparatus of the plate glass according to the present invention will be described in more detail with reference to the accompanying drawings.

1 is a perspective view showing a thermal conductivity test apparatus of the plate glass of the present invention, Figure 2 is a cross-sectional view showing the thermal conductivity test apparatus of FIG.

Referring to the thermal conductivity test apparatus 100 according to the present invention with reference to FIGS. 1 and 2, the insertion groove 15 into which the plate glass 200 to measure thermal conductivity is inserted is formed in the center portion of the plate glass. After the insertion of the container 10 is formed so that the same volume of water at different temperatures on the left and right sides, the cover 20 is in close contact with the container 10 to seal the container, and the container 10 Temperature sensor 30 for measuring the temperature of the water stored in the left and right inside of the inside in real time, the temperature data according to the time measured by the temperature sensor 30, the water contact area and thickness of the plate glass previously input, the mass of water used And a data processing device 40 incorporating software for calculating thermal conductivity using specific heat, and a display unit 50 for displaying thermal conductivity calculated by the data processing device 40.

First, in case of the container 10, the container 10 is made of a heat insulating material to minimize heat exchange with the surrounding environment so that the container does not absorb the heat amount of the water or discharge it to the outside, so that accurate experiments can be performed, and materials such as styrofoam can be used. have.

The inside of the container 10, the insertion groove 15 is formed along the inner surface in the longitudinal direction in the center portion so that the plate glass 200 can be inserted, when the plate glass is inserted into the insertion groove 15, respectively, different Two compartments are formed that can store water having a temperature.

At this time, it is important to seal the water stored in the container 10 so that water cannot pass through the insertion groove 15 and the plate glass 200.

Therefore, after additionally inserting the plate glass 200 into the insertion groove 15, the insertion portion may be taped with a waterproof tape or an elastic rubber may be installed on the outer circumferential surface of the insertion groove to completely close the gap between the insertion groove and the plate glass.

The cover 20 is made of the same styrofoam and the same heat insulating material as the container 10, and when water of different temperatures are stored in the container 10, the cover 20 is mounted on the upper surface of the container 10 to perform a complete sealing. Done.

The digital temperature sensor 30 is installed closest to the plate glass so that the water temperature of the water stored in each compartment of the container 10 formed by the plate glass 200 can be measured without error, It is to measure the temperature.

The temperature sensor 30 as described above measures the temperature in real time, and continuously transmits the temperature to the data processing device 40 with the measurement time.

The data processing device 40 receives the measured temperature and measurement time from the temperature sensor 30 through the built-in software, calculates the rate of change of temperature, receives the temperature, and stores the change of temperature with respect to the time. At the end of the test, the curve is adjusted using the given equation, and the obtained parameters are calculated using the water contact area of the glass plate, the mass of water, and the density of water.

At this time, since the temperature of each water measured by the temperature sensor 30 is measured in real time and transmitted to the data processing device 40, it is possible to arbitrarily select a change amount of time to obtain thermal conductivity according to the change amount of the time. Thermal conductivity can be obtained by selecting the initial time, time interval, and end time for each test.

The display unit 50 serves to display the thermal conductivity calculated through the data processing device 40.

The thermal conductivity test apparatus of the plate glass having such a configuration is that it is possible to easily measure the thermal conductivity of the plate glass by allowing the heat quantity is transferred through the plate glass to each water having a different temperature to the sealed insulation container.

Hereinafter, the thermal conductivity measuring method of the plate glass using the thermal conductivity test apparatus described in the present invention will be described.

Figure 3 is a flow chart showing a method of testing the thermal conductivity of the glass plate of the present invention, look at with reference to Figure 3,

First inserting the plate glass for measuring the thermal conductivity into the insertion groove of the container and injecting water of different temperatures into the left and right compartments formed by the insertion of the plate glass until the same volume;

A closing step of closing the cover and closing the container completely after adding water;

A measurement step of measuring the temperature of the water introduced into the left and right compartments of the sealed container for each time zone;

A calculation step of transmitting the temperature data according to the measured time to the data processing apparatus and calculating thermal conductivity by software input in advance;

A display step of receiving the thermal conductivity calculated by the data processing device and displaying it on the display unit is performed.

First, in the feeding step, the plate glass is mounted at the center of the container having a predetermined size. When the plate glass is mounted at the center of the container as described above, cells having the same size are formed at both left and right sides, and have different temperatures. The water is poured into the left and right compartments.

At this time, the larger the temperature difference of the water used, the more it is possible to measure the thermal conductivity for a long time, so that the appropriate temperature is used, and the volume of water inserted into each compartment should be the same.

In addition, the cold and hot water stored in the left and right compartments are to be free from entering and exiting the water through the gap between the pane and the container, and heat must be passed only through the pane.

In this way, each water is stored in the container, and the upper surface of the container is closed by a heat insulating material, and the container is completely sealed, and then left for a predetermined time, and the temperature of each water is measured by time zone. .

As described above, the temperature change over time for each water is measured, and the data processing device calculates the thermal conductivity of the plate glass using the mass and specific heat of the used water and the water contact area and thickness of the plate glass. .

In general, the method of measuring thermal conductivity uses Newton's cooling law, and the present invention also measures parameters through curve fitting, and calculates thermal conductivity using water contact area of glass and mass of water and density of water.

As described above, the display device receives the thermal conductivity calculated by the data processing apparatus and displays the displayed data on the display unit.

At this time, since the thermal conductivity varies slightly depending on the measured time, it is effective to measure at least three times or more, and then to make the average value of the measured values as the thermal conductivity of the plate glass test body.

In addition, when the measured value of the thermal conductivity is larger than the average, it is an error to use the average value of the remaining thermal conductivity values except for the highest and the lowest measured thermal conductivity values through sufficient test times. Is to reduce the range.

As described above, the method and apparatus for testing the thermal conductivity of the plate glass of the present invention is to install the plate glass in the interior of the heat insulation container, and calculate the amount of temperature change over time by moving the heat quantity of water having different temperatures through the plate glass In order to calculate the thermal conductivity of the plate glass using the temperature change, the mass of water used and the water contact area and thickness of the plate glass, the relationship between the thermal conductivity according to the mixture added to the main raw material of the glass or the ratio between the mixture and the main raw material It can help, and has the effect that the manufactured glass can be used suitably for each application.

Claims (4)

The insertion groove 15 into which the plate glass 200 to measure thermal conductivity is inserted is formed in the center portion, and the container 10 is formed to store the same volume of water at different temperatures on the left and right sides after the plate glass is inserted. )Wow; A cover 20 in close contact with the upper portion of the container 10 to seal the container; A temperature sensor 30 measuring the temperature of the water stored in the left and right sides of the container 10 in real time; A data processing device 40 with built-in software for calculating thermal conductivity using temperature data according to time measured by the temperature sensor 30, water contact area and thickness of a plate glass, and mass of water used in advance; ; Thermal conductivity test apparatus of the plate glass, characterized in that it comprises a display unit 50 for displaying the thermal conductivity calculated by the data processing device 40 The apparatus of claim 1, wherein the container 10 and the cover 20 are heat insulating materials capable of minimizing heat exchange with the surrounding environment. The step of inserting the plate glass into the container of the thermal conductivity test apparatus having the structure of claim 1 in accordance with the insertion groove, and injecting water of different temperatures until the same volume in the left and right compartment formed by the insertion of the plate glass. Wow; A closing step of closing the cover and closing the container completely after adding water; Measuring the temperature of the water introduced to the left and right sides of the sealed container for each time zone; A calculation step of transmitting the temperature data according to the measured time to the data processing apparatus and calculating thermal conductivity by software input in advance; And a display step of receiving the thermal conductivity calculated by the data processing device and displaying it on a display unit. The thermal conductivity test of claim 3, wherein the measurement step and the calculation step are repeatedly measured at least three times to obtain a measured value of the thermal conductivity, and the average value of the measured value of the thermal conductivity is transmitted to the display unit. Way