JPS6010161A - Apparatus for measuring heat retaining property - Google Patents

Abstract

PURPOSE:To reduce a measuring error and to enable the control of radiant heat, by constituting a heat source from a heat ray generating source and a heat source for controlling the atmospheric temp. of said generating source. CONSTITUTION:The temp. in the outside of a specimen received in a heat retaining property measuring apparatus is controlled so as to be made constant in the same way as the interior of a box having a heat ray generating source A1. For example, this heat retaining property measuring apparatus is introduced into a thermostatic apparatus or a cover is formed so as to cover the specimen and air with a constant temp. is blown into said cover from a pipe 5. In this heat retaining property measuring apparatus, heat rays radiated from the heat ray generating source A1 can be measured by providing the heat ray generating source A1 and heat conductivity and reflection of radiant heat can be separately measured while a mesuring error is reduced and the control of radiant heat is enabled.

Description

[Detailed description of the invention] The present invention relates to a heat retention +7114 constant device.

One way to measure the heat retention of a sample is to use heat transfer coefficient, but with conventional methods, it is difficult to control the ambient temperature on both sides of the sample, resulting in large measurement errors. For example, when a heat source is installed inside the device as shown in Figure 2, the temperature inside the device will greatly increase or decrease when the heat source is turned on and off.
Since the temperature was not constant, the heat transfer coefficient fluctuated considerably, leading to large measurement errors. Also, it is not possible to fully control radiant heat.

As a result of considering these points, the Ministry of Invention and others used a heat retention measurement device whose heat source was composed of a heat ray generation source A1 and a heat source B2 that controlled the ambient temperature of the generation source, and The present invention was completed based on the fact that highly accurate numerical values can be obtained by controlling the ambient temperature on the opposite side of the heat ray source A1 to a constant temperature.

That is, the gist of the present invention is to provide an apparatus for measuring the thermal transmission coefficient of a sample by interposing the sample between a heat source and a heat flow meter, in which the heat source is a heat ray generation source and a heat source that controls the ambient temperature of the generation source. There is a heat retention measuring device comprising:

An example of the heat retention measuring device of the present invention is shown in Figures 2 and 3. , Figures 1-2 are of the separated type, and Figure 3 is of the integrated type.

In the present invention, the heat ray generation source A emits heat rays from there, and by measuring the amount of heat passing through the sample, the difference due to the difference in heat ray reflectance of various samples appears as a difference in the amount of heat passing.

At this time, it is possible to change the emissivity, the wavelength of the heat rays, etc. by changing the type and temperature of the heat ray source and the distance from the sample.

The heat source B is used to generate the ambient temperature of the heat source B in order to control the temperature of the atmosphere inside the box to the heat ray generation source, and is installed in a separate box from the heat ray generation source A.

The temperature inside this box is maintained at a constant temperature using a thermostat, and air is blown through a pipe or the like to the box side facing the source of the heat rays. As for the air blowing method, use a fan for the separate type shown in Figure 2, or use a fan with the integrated type shown in Figure 3.・
. With this method, the temperature of the atmosphere inside the box towards the heat ray generation source is kept constant, and there is no rise or fall in temperature as in the conventional method.In addition, at this time, hot air controlled at a constant temperature from heat source B by a fan etc. When blowing air to the box side facing the heat ray source, make sure that the air does not hit the sample to be measured and disturb the heat flow.
Care should be taken to reduce the amount of air being blown.Furthermore, heat source B
Merely blowing air from the side to the heat ray generation source A side is not suitable for measuring the heat transmission coefficient of a breathable sample. Therefore, it is preferable to exhaust the air at approximately the same amount as the blown air volume. Note that, in consideration of thermal efficiency, it is preferable that the exhausted hot air not return to the heat source B side.

In the heat retention measurement device of the present invention, the temperature of the sample is ℃, the heat ray generation source A
Make a hole in the box and set the sample,
If you want to see the effect of heat rays on the heat ray source, select heat ray source A.
All you have to do is make a hole right above it. In this way,
Measure the heat flow through the sample.

The temperature outside the sample of the heat retention measuring device according to the present invention needs to be controlled in the same way as inside the box of the heat ray source A.
Make sure the temperature remains constant.

For example, the heat retention measuring device of the present invention may be placed in an apparatus where the temperature is constant, or a cover may be made to cover the sample, and air at a constant temperature may be blown through a pipe or the like. The constant temperature at this time is preferably set by setting the ambient temperature in another box in the same manner as in the box of heat source B according to the present invention, and blowing air at a constant temperature. Furthermore, when blowing air, it is preferable to prevent the air from hitting the sample and to emit air in an amount that is approximately the same as the amount of air being blown, which is the same as in the box to the heat ray generation source of the heat retention measuring device according to the present invention. .

The heat retention measuring device according to the present invention is characterized in that by providing the heat ray generation source A, it is possible to measure the amount of heat rays radiated from the heat ray generation source as the amount of heat that the sample passes through. In addition, when the thermal conductivity of the sample is measured by controlling only the ambient temperature without using the heat ray generation source A, it is possible to measure only the difference in thermal conductivity of the samples. In this way, heat conduction and reflection of radiant heat
filj can be determined separately.

In the present invention, the types of the heat ray generating source A and the heat source B are not particularly limited and can be used. For example, infrared heaters, light bulbs,
These include hot water, heated iron, copper, and aluminum plates.

Next, the present invention will be explained in detail.

Example 2 A heat retention measuring device as shown in Figure 2 was provided. An electric heater is used for the heat ray generation source A, and the temperature is controlled at 35°C.
The ambient temperature was set at 30° C., and the ambient temperature was controlled by blowing hot air heated in the box of heat source B through a pipe to the box side facing the heat ray generation source using a fan. At this time, the air volume of the fan is set to Q, 2m/S e C, and further, the airflow from the inside of the box to the heat ray generation source is 0.2m/S e C.
Evacuation was performed at m/see. Heat source B uses an infrared heater and generates hot air whose ambient temperature is controlled to ±1°C by a thermostat. In addition, the distance between the heat ray generation source A and the sample is set to 10 crIL, and an ammeter sensor manufactured by Showa Denko (Co., Ltd.) is attached above the sample to measure the amount of heat passing through the sample. The entire device was placed in a thermostat with an ambient temperature of 10°C, and the heat transfer coefficients of various samples were measured in a no-air condition.The results are shown in Table 1.As a comparative example, Figure 1 shows the results. A device as shown was installed. An electric heater was used as the heat source, and the ambient temperature inside the box was set at 30°C. The distance between the sample and the heat source was 30 CT.
JL, a heat flow meter sensor was attached on top of the sample, the entire device was placed in a constant temperature device at 10° C., and the heat transfer coefficients of various samples were measured in a windless state.

In addition, sample 1 is a waterproof coating material with a basis weight of 1 zol/-, and sample 2 is a waterproof coating material with a basis weight of 12 o i/m", with aluminum vapor-deposited on the resin coating surface. Both samples 1 and 2 have a fiber base. Measurements were taken with the play side facing outside the device.

In Table 1, the comparison example has large variations in both the internal temperature and heat transmission coefficient, but the heat retention measuring device of the present invention can obtain stable values.

spear 1 table

[Brief explanation of the drawing]

Figure 1 shows an example of a conventional heat retention measuring device. Figures E-2 and T-3 show the heat retention measuring device of the present invention,
Figures 2 and 2 show a separate type, and Figure 213 shows an integrated type.

Claims (1)

[Claims] Heat retention measurement in a device that measures the thermal transmission coefficient of a sample by interposing the sample between a heat source and a heat flow type, in which the heat source is composed of a heat ray generation source and a heat source that controls the ambient temperature of the generation source. Device