JPH02225751A - Structure of snow-thawing roof material - Google Patents

Abstract

PURPOSE:To raise the snow-thawing effect of roofing by suppressing the loss of heat energy by using a lap structure in which an electric heater is closely set on the downside of a roof surface material and a heat insulator is struck to the downside of the heater. CONSTITUTION:An electric heater 4 is closely set on the downside of a roof surface material 3 of metal plate, and a heat insulator 5 is closely contacted with the downside of the heater 4 to form a lap structure consisting of the surface material 3 and the heater 4. In this case, the electric heaters 4 of a smaller size than the surface material 3 are stuck to one surface material 3 according to relations with the shape and size of the heater 4 in a distributed manner. The feeder for each electric heater 4 is connected to one connecting terminal.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to the structure of a snow-melting roofing material that can efficiently transmit thermal energy from an electric heater to a roof surface material.

[Conventional technology]

As a conventional snow melting roofing material, Utility Model Publication No. 57-167127
There are some things described in the specification and drawings of the issue. This conventional technology has a structure in which a flat electric heater is laid on the top surface of the roof sheathing material, and a galvanized iron roof surface material is laid on the top surface, and the thermal energy of the electric heater is transferred to the roof surface material. This is to melt the snow on top of it.

[Problem to be solved by the invention]

However, in the above-mentioned conventional technology, not only is the electric heater directly installed on the top surface of the roof sheathing material, but also a void layer is formed between the electric heater and the roof surface material above it. Thermal energy of the heater is directly transferred to the lower roof sheathing material, and insufficient heat energy is transferred to the upper roof surface material because the void layer acts as an insulator, resulting in energy loss. The problem was that it was large.

Furthermore, if the above-mentioned conventional technology is applied when the roof surface material is formed into a corrugated or other uneven shape, a relatively large gap is formed between the inner surface of the convex part of the roof surface material and the electric heater, so that the roof surface material There is a further problem that the transfer of heat energy to the material becomes insufficient, and furthermore, when the air permeability of the void is high, there is also a problem that heat energy is lost to the outside.

This invention was made in view of the problems of the prior art, and aims to provide a snow melting roofing material that suppresses loss of thermal energy and has a high snow melting effect.

[Means to solve the problem]

The structure of the snow-melting roofing material of this invention is that an electric heater is brought into close contact with the lower surface of the roof surface material made of a metal plate, and a heat insulating material is brought into close contact with the lower surface of the electric heater, so that the roof surface material, the electric heater, and the heat insulating material are brought into close contact with each other. It has a polymer structure.

Depending on the relationship between the shape and dimensions of the roof surface material and the shape and dimensions of the electric heater, a plurality of electric heaters with smaller dimensions may be distributed and closely attached to one roof surface material. It is preferable to connect the power supply line to each electric heater to one connection terminal. In this case as well, it goes without saying that the heat insulating material is brought into close contact with the lower surface of the electric heater to create a superimposed structure of the roof surface material, the electric heater, and the heat insulating material.

[Effect]

Since the snow-melting roofing material of this invention has a superposition structure of the roof surface material, electric heater, and heat insulating material, the snow-melting roofing material can be manufactured in a factory, improving manufacturing efficiency and ensuring uniform quality. It is possible to reduce the number of man-hours at the roofing site.

In addition, the thermal energy generated in the energized electric heater is blocked by the insulation material on the lower surface, so it is not transmitted to the roof sheathing material below, and the thermal energy is directly transmitted to the roof surface material on the upper surface of the electric heater. Furthermore, since the electric heater is not in contact with other parts or voids, most of the thermal energy of the electric heater is transferred to the roof surface material. Therefore, a strong snow melting effect can be obtained.

If multiple electric heaters are distributed and closely attached to one roof surface material, and the power supply lines to each electric heater are connected to one connection terminal, the electric heaters can be powered when snow melting roofing material is laid. This makes it easier to connect to.

〔Example〕

FIG. 1 is a perspective view of the snow-melting roofing material 2 laid on the upper surface of the roof sheathing material l, and FIGS. 2 to 4 are explanatory diagrams of the snow-melting roofing material 2 itself. The snow-melting roof material 2 has a flexible electric heater 4 on the lower surface of a corrugated roof surface material 3 made of a metal plate.
are brought into close contact with each other, and a flexible heat insulating material 5 is further brought into close contact with the lower surface of the electric heater 4, thereby forming the whole into a triple-layer corrugated structure. It is also possible to dispose a material that reflects infrared rays, such as aluminum foil, between the thermal heater 4 and the heat insulating material 5, thereby further improving the thermal efficiency as described below.

The snow melting roofing material 2 has a vertical roofing type and a horizontal roofing type, and the vertical and horizontal dimensions correspond to the type. A plurality of electric heaters 4 can be installed in eight pieces on one roof surface material 3. In this embodiment, the shape of the snow-melting roofing material 2 is stepped like tiles stacked on top of each other, so the corrugated roof surface material 3 forms steps in the vertical direction, and the back surface of each step Electric heaters 4 of a size corresponding to the dimensions of the steps are individually attached in close contact with each other, and a heat insulating material 5 is closely attached to the lower surface thereof. Thus, the snow-melting roof material 2 of this embodiment is composed of one roof surface material 3, a plurality of electric heaters 4, and one heat insulating material 5.

At one left and right end of the snow-melting roofing material 2, a portion 2a is formed where the electric heater 4 and the heat insulating material 5 are not disposed in order to overlap the snow-melting roofing material 2 laid adjacently. In addition, each power supply cotton 6 to each electric heater 4 is one for each snow melting roofing material 2.
The two connection terminals 7 are connected in parallel.

Although this embodiment shows an example in which a plurality of electric heaters 4 are used for one sheet of snow-melting roof material 2, depending on the shape and dimensions of the roof surface material 3, It is also possible to configure a single electric heater 4 of a size corresponding to this in close contact.

The snow-melting roofing material 2 is manufactured in a factory, transported to the site, and placed over the top surface of the waterproof sheet 7 laid on the roof sheathing material l. The snow-melting roofing material 2 is laid over the snow-melting roofing material 2 that has already been laid, with its ends overlapping. Power supply! Since the terminals 7 of the IIA 6 can be successively connected to the power source in parallel with the work of roofing the snow-melting roofing material 2, the wire connection work at the roofing site can be simplified.

When electricity is applied to the electric heater 4 to heat it, the thermal energy of the electric heater 4 is blocked by the insulation material 5 on the lower surface, and therefore is not transmitted to the roof sheathing material 1 below. If an infrared reflective material is pasted on the surface of the heat insulating material 5L, the heat energy is reflected in the negative direction, so that the thermal energy blocking effect is further improved.

In addition, the electric heater 4 is attached to the roof surface material 3 on the top surface of the electric heater 4.
On the other hand, most of the heat energy of the electric heater 4 is transferred to the roof surface material 3 because the electric heater 4 is not in contact with other parts or gaps. Therefore, the thermal energy of the electric heater 4 can be efficiently used for snow melting.

In particular, when the snow melting roofing material 2 has a corrugated shape as in this embodiment, a gap 9 is formed between the lower surface of the insulation material 5 and the roof sheathing material 1, so there is also a gap on the lower side of the insulation material 5. 9 is formed, and the insulation effect in the lower part is high.

These high thermal efficiencies can be obtained no matter where the snow melting roofing material 2 is used on any part of the roof, so it is not necessary to cover the entire roof, but only in areas where snow melting is particularly necessary, for example, on the roof on the north side of the house. It is also possible to use this snow-melting roofing material 2. Furthermore, in addition to distributing a plurality of electric heaters 4 on one roof surface material 3 evenly, depending on the location where the snow melting roof material 2 is used, it is possible to distribute the plurality of electric heaters 4 on one roof surface material 3 evenly, such as under the eaves of one roof surface material 3. The electric heaters 4 are not used in areas with a small amount of snow, but are concentrated in areas of the single roof surface material 3 where direct snowfall and falling snow from the eaves overlap, such as outside under the eaves. It is also possible to create a distribution such that

In order to confirm the effects of this invention, the inventors placed an electric heater 4 on the lower surface of the corrugated roof surface material 3, and
The temperature distribution on the surface was measured using an infrared sensor. Figures 5 and 6 show the temperature distribution. Figure 5 shows the case where the electric heater 4 is placed in close contact with the lower surface of the corrugated roof surface material 3, and Figure 6 shows the case where the electric heater 4 is made flat. This is a case in which the electric heater 4 is brought into contact only with the bottom of the trough portions of the corrugated roof surface material 3, and a gap is formed between the roof surface material 3 and the electric heater 4 at the peak portions. In both cases, the same roof surface material 3 was used, and in FIG. 5, the electric heater 4 was 206W, and in FIG. 6, the electric heater 4 was 432W.

As a result, in the case of FIG. 6, which corresponds to the prior art, the maximum temperature of the surface of the roof surface material 30 is 14 when 30 minutes have elapsed after electricity is applied.
5°C, which corresponds to the present invention, the maximum surface temperature reaches 27°C even though the amount of heat from the electric heater 4 is less than half that of the case shown in FIG. 6. I understand. As a result, it can be inferred that thermal efficiency is further improved by closely adhering the heat insulating material 5 to the lower side of the electric heater 4 as in the present invention. In addition, the numbers surrounded by circles such as ■■■... in Fig. 5.6 indicate the temperature.

In addition, in order to confirm the effect of the heat insulating material 5, the roof surface material 3
The results of measuring the temperature change on the surface of the roof surface material 3 are shown below: with the electric heater 4 in close contact with the bottom surface and with the heat insulating material 5 in close contact with the bottom surface of the electric heater 4, and with the heat insulating material 5 not used. It is shown in FIG. In this case, the electric heater 4 is 4
A device with a heat capacity of 32 W was used, and temperature changes were measured from the time of energization until 30 minutes had elapsed. In each case, a corrugated roof surface material 3 was used, and each temperature was taken as the average value of the peaks and valleys. As a result of the measurement, it was found that the case shown by the solid line in which the heat insulating material was in close contact with the bottom surface of the electric heater 1 had much better thermal efficiency than the case shown by the broken line in which no heat insulating material was used.

From these results, it was found that the electric heater 4 was placed on the bottom surface of the roof surface material 3.
It was possible to confirm the high thermal efficiency of bringing the heat insulating material 5 into close contact with the lower surface of the heat insulating material 5.

〔Effect of the invention〕

As explained above, according to the present invention, the mature energy of the electric heater is blocked by the insulation material on the lower surface and is directly transmitted to the roof surface material, so that most of the thermal energy of the electric heater is transmitted to the roof surface material. It is possible to obtain a powerful snow melting effect. Furthermore, it is also possible to use multiple electric heaters for one roof surface material to concentrate the distribution of electric heaters on areas that particularly require snow melting ability, and in this case, the power supply to each of the electric heaters can be If you connect the electric wire to one connection terminal, you can connect the electric heater to 11 when installing snow-melting roofing material.
This also has the effect of simplifying on-site work by making it easier to connect to the power source.

[Brief explanation of the drawing]

Figure 1 is a cutaway perspective view of the snow-melting roofing material laid on the roof sheathing material, Figure 2 is a plan view of the snow-melting roofing material, Figure 3 is a sectional view taken along the line ■-■ in Figure 2, and Figure 4 is a cross-sectional view of the snow-melting roofing material. FIG. 2 is a cross-sectional view taken along the line IV-TV, FIG. 5 is a plan view showing an example of the temperature distribution of the present invention, FIG. 6 is a plan view showing an example of the temperature distribution of the conventional example, and FIG. 7 is a plan view showing the roof. It is a graph comparing changes in temperature on the surface of a surface material with and without a heat insulating material. 1... Roofing material, 2... Snow melting roofing material, 3... Roof surface material, 4... Electric heater, 5... Insulating material, 6...
...Power line, 7...terminal, 8...waterproof sheet

Claims (2)

[Claims] (1) An electric heater is closely attached to the lower surface of the roof surface material made of a metal plate, and a heat insulating material is closely attached to the lower surface of the electric heater, resulting in a superimposed structure of the roof surface material, the electric heater, and the heat insulating material. The structure of snow melting roofing material. (2) A plurality of electric heaters are distributed and closely attached to the lower surface of the roof surface material made of a single metal plate, and a heat insulating material of a size corresponding to the roof surface material is closely attached to the lower surface of each electric heater. A structure of a snow melting roof material, characterized in that the roof surface material, the electric heater, and the heat insulating material are superimposed, and the power supply lines to each of the electric heaters are connected to one connection terminal.