JPH1162317A - Snow-melting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To melt snow efficiently in energy conservation by making a part of heat energy applied to snow melting depend upon solar-heat energy according to weather without completely depending upon fuel. SOLUTION: An air flow passage 2 is formed just under a roof material 1' having an excellent heat conductivity or a superior solar absorptivity, and a circulating duct 39, to which an air blower 7 and a heating coil 40 are arranged, is connected to the air flow passage 2. Or the air blower 7 and the heating coil 40 are operated and air heated by the heating coil 40 is passed through the air flow passage 2 and the roof material 1' is heated in a large quantity of snow fall the air blower 7 and the heating coil 40 are stopped and the roof material 1' is heated by solar rays at clear weather having little snow fall or only the air blower 7 is operated and air in the air blow passage 2 is heated by the roof material 1' heated by solar rays at the clear time to intend to melt snow weakly.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for treating snow on a roof.

[0002]

2. Description of the Related Art Conventionally, various methods have been proposed for melting snow on a roof. However, when heating air previously collected by sunlight is used for heating, the applicant uses the equipment as it is. Filed a Japanese Patent Application No. 3-78490 for a method for melting snow on a solar system house that can remove snow on the roof at low cost.
Patent was obtained as Patent No. 2597243.

As shown in FIG. 11, a solar system house as a premise is provided with an air flow path 2 having a roof gradient directly under a roof plate 1 and a lower surface provided with a heat insulating material such as glass wool. The heat insulation layer 25 is configured. One end of the air flow path 2 is opened as an outside air inlet 3 in the underside of the eaves or the space behind the hut for ventilation in the hut, and the other end is connected to a ridge duct 4 as a heat collection box made of a heat insulating material. 6. A fan 7, and a flow path switching damper 8 are provided. One of the outlet sides of the flow path switching damper 8 is provided with a handling box 5 which is opened to the outside by an exhaust duct 9 in an attic space. The inflow side of the prevention damper is communicated with the ridge duct 4, and one of the outflow sides of the flow path switching damper 8 is connected to the upper end of the falling duct 10. The lower end of the falling duct 10 is opened to an air circulation space 13 between the heat storage soil concrete 11 and the floor panel 12, and an outlet from the air circulation space 13 to the room.
14 is provided.

A hot water supply coil 15 is provided in the handling box 5 between the backflow prevention damper 6 and the fan 7, and the hot water supply coil 15 is connected to a hot water storage tank 17 by a circulation pipe 16. An auxiliary boiler 18 for firing is provided on the way,
Connect the hot water supply pipe to the bathroom, washroom, and kitchen.

[0005] Roof 1 which is a metal plate heated by sunlight
However, the outside air that has entered the air passage 2 is warmed, and the warmed air rises along the gradient. Then, the heated air is collected in the ridge duct 4 and then enters the handling box 5 by the fan 7, flows down from the handling box 5 into the falling duct 10, and circulates air between the heat storage soil concrete 11 and the floor panel 12. Enter space 13. This air circulation space
In 13, there are three types of heating: heating air directly under the floor via the floor panel 12, storing heat in the thermal storage clay concrete 11, and blowing out hot air directly from the outlet 14 into the room. Perform the action.

On the other hand, a hot water supply coil 15
The water sent from the hot water storage tank 17 is heated and stored as hot water in the hot water storage tank 17, and is further re-heated by an auxiliary boiler 18 for additional heating as needed from the hot water supply pipe to supply hot water to various places. .

In such a solar system house,
Since the roof plate 1 is a heat collecting plate, if the roof is covered with the snow 19, heat is not collected and the system is not effectively used, so it is possible to use the equipment as it is and remove the snow on the roof at low cost. The fan 7 can be rotated forward and reverse.
Air flow space between thermal storage clay concrete 11 and floor panel 12
A pit 20 formed by dug-out the thermal storage clay concrete 11 was formed in 13, and a fan vector 21 as an auxiliary heating device was installed in the pit 20.

Reversing fan 7 and fan vector
By operating 21, the warm air in the air circulation space 13 between the thermal storage clay concrete 11 and the floor panel 12 and the warm air in the room are heated by the fan vector 21 to become high-temperature air, and the roof slope just below the roof panel 1 is heated. The roof plate 1 is heated by heating the roof plate 1 so that the snow accumulated on the roof is melted from the lower surface to promote snow fall.

[0009]

However, the high-temperature air heated by the fan vector 21 as the auxiliary heating device is sent to the air flow path 2 having a roof gradient just below the roof plate 1 and the snow piled on the roof. Melting snow from the lower surface to promote snowfall always involves consumption of fuel, which increases running costs for snowmelt and is wasteful.

An object of the present invention is to solve the above-mentioned disadvantages of the prior art and not to rely entirely on fuel, but to save energy and efficiently by relying on solar thermal energy for part of the thermal energy involved in snow melting depending on the weather. It is to provide a snow melting method that can be performed.

[0011]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention firstly forms an air flow path directly under a roofing material having good heat conductivity or good solar absorptivity, and comprises a fan and a heating device. The circulation duct provided with the device is communicated with the air flow path, and during snowfall or when there is a lot of snow, the air heated by the heating device is passed through the air flow path by operating the fan and the heating device. Heat the roofing material, and when it is sunny and there is little snow, stop the operation of the fan and heating device and heat the roofing material with sunlight. The gist of the present invention is to warm the air in the air passage with a roof material that is driven by sunlight and to circulate the air.

Second, the fan is a fan that can rotate normally and reversely, and the gist of the fan is to alternately operate the normal and reverse directions so that heated air flows to and from the air flow path.

Third, an air flow path is formed directly under a roof material having good heat conductivity or good solar radiation absorption, and a part of the upper surface of the roof material is covered with glass, and a fan and a heating device are provided. The established circulation duct is communicated with the air flow path, and when snow falls, or when there is a lot of snow, the fan and the heating device are operated to allow the air heated by the heating device to pass hot air through the air flow path. When the roofing material is heated and it is sunny and it is going to melt snow slightly, operate only the fan and warm the air in the air passage with the roofing material heated by the sunlight under the glass and distribute it. It is an abstract.

Fourthly, an air flow path is formed directly under a roof material having good heat conductivity or good solar radiation absorption, and a circulation duct provided with a fan and a heating device is communicated with the air flow path. Connect a feed duct to the room or under the floor to the duct, take in outside air into the air flow path, warm the air in the air flow path with the roof material heated by sunlight, distribute it, and exit from the air flow path The gist of the invention is that air is passed through a heating device and a fan, heated by the heating device, and used for heating via a feed duct.

According to the first aspect of the present invention, warm air is passed under the roof surface on which snow is piled, thereby melting all or a part of the snow layer to reduce the snow load on the building. Both reduce the trouble and danger of removing the snow.By using air as the heat medium, it is easy to heat the snow-melted part in a planar manner, and freezing and Don't worry.

In addition, a uniform snow melting method is not adopted. When the weather is fine and the amount of snow is small, the operation of the fan and the heating device is stopped and the roof material is heated by sunlight. This is to create natural convection in the air flow path of the snow to melt the snow. In this case, the snow is melted by warming and circulating the air, and in any case, it is possible to melt snow by relying on solar thermal energy without consuming fuel.

The temperature of the heated air sent into the air flow path immediately below the roofing material decreases as the distance from the entrance increases, so that the further away from the entrance, the more difficult it is for snow to melt.
According to the second aspect of the present invention, in addition to the above-mentioned operation, the fan operates alternately in a forward / reverse direction to move heated air to and from the air flow path, thereby improving the snow melting ability as compared with the case of one-way traffic. It will be able to demonstrate in an effective way.

According to the third aspect of the present invention, in addition to the above-mentioned functions, the glass heat collecting portion in which a part of the upper surface of the roofing material is covered with glass has a smooth glass surface, so that the air of snow melting can be obtained. When circulating, snow on the glass slips and falls easily. If the solar radiation is generated, the temperature of the glass heat collecting portion rises and the solar heat is exchanged with the circulating air, so that the solar heat can be effectively used for the air circulation of the snow melting.

According to the fourth aspect of the present invention, in addition to the above-described operation, air heated by sunlight is used for melting snow, then heated by a heating device and used for heating. The multipurpose (combined) use of the air circulation type snow melting system becomes possible.

[0020]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows one of the snow melting methods of the present invention.
In the explanatory view showing the embodiment, reference numeral 1 'in the figure is a roof material having good heat conductivity, and an air flow path 2 is formed immediately below the roof material 1'. The roofing material 1 'may be the same as the roofing plate 1 shown in the conventional example, and may be a material having good solar radiation absorption instead of good heat conductivity.

The air flow path 2 formed immediately below the roofing material 1 'is provided with a heat insulating layer 25 made of a heat insulating material below. In the illustrated example, the air passage 2 has a roof slope, but may have a land (horizontal) roof.

A circulation duct 39 is connected between both ends of the air passage 2.
In the middle of the circulation duct 39, a fan 7 and a heating coil 40 as a heating device are provided. The fan 7
Is a propeller fan that can be rotated forward and backward. In the case of a sirocco fan, the flow direction is controlled by a damper, though not shown, so that the air flows into the air flow path 2 from any direction. .

The heating coil 40 may be of the heat exchanger type with plate fins. In the conventional example shown in FIG. 14, the hot water supply coil 15 is connected to a hot water storage tank 17 by a circulation pipe 16, and the hot water storage tank 17 is provided with an auxiliary boiler 18 for additional heating in a bath, a washroom, a kitchen, or the like. The hot water supply pipe 24 connected to the hot water supply pipe 24 is connected. However, it is conceivable to use the hot water supply coil 15 as a heating coil 40 as a heat source by flowing hot water from a boiler. In addition, as a heating device, in addition to the heating coil 40 using such hot water, use of a heater or the like using electricity or combustion air is also conceivable.

The present invention is divided into three cases: (A) when the snow falls or when there is a lot of snow, (B) when it is fine and the snow is small, and (C) when it is clear and the snow is going to melt slightly. This is to change the mode of snow melting.

In the first embodiment of the present invention, as shown in FIG. 2, (A) when the snow falls or the snow is heavy, the solar radiation cannot be expected, so that the fan 7 and the heating coil 40 are operated. The air heated by the heating coil 40 is passed through the air flow path 2 in one way to heat the roofing material 1 from below. As a result, the snow in contact with the heated roofing material 1 melts.
In the figure, 19 indicates snow cover.

The direction of the warm air flowing through the air passage 2 is not particularly limited, but when the air passage 2 has a roof gradient,
As shown by an arrow in FIG. 2, it is more efficient to move upward from the lower side as the upward airflow.

As shown in FIG. 3, (B) when the weather is fine and the snowfall is small, the operation of the fan 7 and the heating coil 40 is stopped. Since there is little snowfall, at least a portion of the roofing material 1 'is exposed without being covered with snow. If this part is heated with sunlight, the roofing material 1 'is warmed, and the snow is directly melted by this, and the roofing material 1' heats the air in the lower air flow path 2 to cause natural convection. Thus, the portion of the roofing material 1 'where the snow is located is heated to melt the snow.

As shown in FIG. 4, (C) when the snow is fine and the snow melts slightly, only the fan 7 is operated. Also in this case, the air is passed through the air flow path 2 in one way. The air that enters the air flow path 2 from the fan 7 is heated by sunlight at a portion of the roofing material 1 ′ that is not covered with snow and is exposed to sunlight. 2 to heat the portion of the roofing material 1 'on which the snow is located to melt the snow. Note that the air gradually becomes higher in temperature by circulating and passing through the air flow path 2 many times. At the same time, the roofing material 1 'is warmed, which can also directly melt the snow.

As a second embodiment of the present invention, the fan 7
Is a fan that can be rotated forward and backward. As shown in FIG. 5, (A) when the snow falls or when there is a lot of snow,
The air heated by the heating coil 40 is alternately operated in the forward and reverse directions to make the air flow to the air flow path 2. .

(B) When the weather is fine and the amount of snow is small, the operation of the fan 7 and the heating coil 40 is stopped, and the roof material 1 'is warmed and the snow is directly melted as in the first embodiment. In addition, the roofing material 1 'heats the air in the lower air flow path 2 and natural convection is induced, which heats the snow-covered portion of the roofing material 1' and melts the snow.

(C) When it is sunny and the snow is to be melted slightly, only the fan 7 is operated as shown in FIG. To and fro.

As described above, the fan 7 operates alternately in the forward and reverse directions, so that the variation in the heating of the roof surface is reduced.
The amount of snowfall can be further reduced.

As a third embodiment of the present invention, as shown in FIG. 7 and FIG.
Covered. In this way, the snow is slippery on the glass 41, so that the snowfall becomes smaller.

As shown in FIG. 7, (A) at the time of snowfall or when there is a lot of snow, the fan 7 is operated alternately in the forward and reverse directions or only in one direction to convert the air heated by the heating coil 40 into the air. The flow was made to flow in or out of the channel 2 in one direction.

(B) When the weather is fine and the amount of snow is small, the operation of the fan 7 and the heating coil 40 is stopped, and the roof material 1 'is warmed and the snow is directly melted as in the first embodiment. In addition, the roofing material 1 'heats the air in the lower air flow path 2 and natural convection is induced, which heats the snow-covered portion of the roofing material 1' and melts the snow.

As shown in FIG. 8, (C) When it is sunny and the snow is to be melted slightly, only the fan 7 is operated as shown in FIG. 6, but the fan 7 is operated alternately in the forward and reverse directions or in one direction. Only the operation is performed to allow the air to reciprocate or flow in one direction through the air flow path 2.

FIG. 9 shows a fourth embodiment of the present invention. A falling duct 10 is connected to a circulation duct 39 as a feed duct to a room or under the floor.
Dampers 38a and 38b are provided in 10 and the circulation duct 39, respectively. That is, in the present embodiment, the method of the present invention is applied to the solar system house shown in FIG. 11, and an outside air inlet 3 is provided at the end of the air flow path 2 to take in outside air from there, The air in the air flow path 2 is heated and circulated by the roofing material 1 ′ heated in the step 1, and snow is melted.
Then, it is heated by the heating coil 40 and sent to the room or under the floor via the falling duct 10 for heating.

The falling duct 10 can be circulated through the circulation duct 39 without flowing air through the falling duct 10 by the dampers 38a and 38b.

FIG. 10 shows an example of a solar system house to which the fourth embodiment is applied. An air passage 2 having a roof gradient is formed directly under a roof plate 1 (roof material 1 ′),
One end of the air flow path 2 is opened as an outside air inlet 3 on the underside of the eave, and the other end is connected to a ridge duct 4 as a heat collection box made of a heat insulating material.

The handling box 5 provided with the backflow prevention damper 6, the fan 7 and the flow path switching damper 8 is connected to the ridge duct 4 via a heat collecting duct 44, and via a circulation duct (return duct) 22. It is connected indoors, and the tip of the snow melting duct 45 extending from the handling box 5 is connected to the air flow path 2. These circulation ducts 39 are constituted by a combination of a heat collecting duct 44 and a snow melting duct 45.

An exhaust duct 9 which is open to the outside is connected to the outlet side of the flow path switching damper 8, and the lower end has an air flow space between the heat storage soil concrete 11 and the floor panel 12.
A falling duct 10 opening to 13 is also connected to the outflow side of the flow path switching damper 8.

In the handling box 5, a hot water supply coil 15 and a heating coil are provided between the backflow prevention damper 6 and the fan 7.
40, and the hot water supply coil 15 and heating coil 40
At 16 a hot water tank 17 and snow melting: connected to a heating boiler 47.

In the figure, 48 is a control panel, 49 is a power control panel, and a snowfall sensor 50, a snow sensor 51, and a ridge duct 4 provided outdoors.
The control panel 48 includes a ridge temperature sensor 43a provided outside, an outside air temperature sensor 43b provided outside, and a room temperature sensor 43c provided indoors.
And a snow melting signal, a heating signal, and a hot water removal signal from the control panel 48 are introduced to the power control panel 49.

The snowfall sensor 50 and the snowfall sensor 51 detect the presence or absence of snowfall and the amount of snowfall. The above-mentioned (A) when snowfall or when there is a lot of snowfall, (B) when it is clear and there is little snowfall, (C) It is used to make snow melting differently in three cases when it is sunny and it is going to melt snow slightly.

[0045]

As described above, the snow melting method of the present invention
Melting all or part of the accumulated snow by passing warm air under the snow-covered roof surface reduces the snow load on the building and also reduces the time and danger of removing the snow. By using air as the heating medium, it is easy to heat the snow-melt area in a planar manner, and there is no need to worry about freezing and maintenance as with the water type, and all rely on fuel. Rather, depending on the weather, part of the heat energy involved in melting snow can be relied on solar heat energy to save energy and efficiently.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing one embodiment of a snow melting method of the present invention.

FIG. 2 is an explanatory diagram of (A) a snowfall or a heavy snowfall according to the first embodiment;

FIG. 3 is an explanatory diagram of a first embodiment when (B) is fine and the snowfall is small.

FIG. 4 is an explanatory diagram of the first embodiment when (C) it is sunny and it is going to melt snow slightly;

FIG. 5 is an explanatory diagram of (A) a snowfall or a heavy snowfall as a second embodiment.

FIG. 6 is an explanatory diagram when (C) it is sunny and it is going to melt snow slightly as a second embodiment.

FIG. 7 is an explanatory diagram of (A) a snowfall or a heavy snowfall as a third embodiment.

FIG. 8 is an explanatory diagram when (C) it is sunny and the snow is to be melted slightly as a third embodiment.

FIG. 9 is an explanatory diagram of a fourth embodiment.

FIG. 10 is an explanatory diagram showing an example of a solar system house to which the fourth embodiment is applied, shown in FIG.

FIG. 11 is a vertical sectional front view of a solar system house showing a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Roofing board 1 '... Roofing material 2 ... Air flow path 3 ... Outside air intake 4 ... Building duct 5 ... Handling box 6 ... Backflow prevention damper 7 ... Fan 8 ... Flow path switching damper 9 ... Exhaust duct 10 ... Falling duct 11 ... heat storage clay concrete 12 ... floor panel 13 ... air circulation space 14 ... outlet 15 ... hot water supply coil 16 ... circulation piping 17 ... hot water storage tank 18 ... auxiliary boiler 19 ... snow cover 20 ... pit 21 ... fan vector 22 ... circulation duct 25 ... heat insulation layer 38a, 38b ... damper 39 ... circulation duct 40 ... heating coil 41 ... glass 43a ... building temperature sensor 43b ... room temperature sensor 43c ... room temperature sensor 44 ... heat collecting duct 45 ... snow melting duct 47 ... snow melting: heating boiler 48 … Control panel 49… Power control panel 50… Snowfall sensor 51… Snowfall sensor

Claims (4)

[Claims] 1. An air flow path is formed directly under a roof material having good heat conductivity or good solar radiation absorption, and a circulation duct provided with a fan and a heating device is communicated with the air flow path.
During snowfall or when there is a lot of snow, operate the fan and heating device to allow the air heated by the heating device to pass through the air flow path to heat the roofing material. When the fan and the heating device are stopped and the roofing material is heated by sunlight, and when it is sunny and it is going to melt the snow weakly, only the fan is operated and the roofing material heated by sunlight is used in the air passage. A snow melting method characterized by warming the air and circulating it. 2. The fan is a fan that can rotate forward and backward,
2. The snow melting method according to claim 1, wherein the fan operates alternately in forward and reverse directions to move heated air to and from the air flow path. 3. An air flow path is formed directly under a roof material having good thermal conductivity or good solar radiation absorption, a part of the upper surface of the roof material is covered with glass, and a fan and a heating device are provided. A circulation duct is communicated with the air flow path, and when snow falls or when there is a lot of snow, the fan and the heating device are operated to allow the air heated by the heating device to pass through the air flow path to heat the roofing material. Then, when it is sunny and you are going to melt snow weakly,
A snow melting method characterized by heating only air in an air flow path with a roof material heated by sunlight under glass by operating only a fan to distribute the air. 4. An air flow path is formed directly under a roof material having good heat conductivity or good solar radiation absorption, and a circulation duct provided with a fan and a heating device is communicated with the air flow path.
Connect a feed duct to the room or under the floor to the duct, take in outside air into the air flow path, warm the air in the air flow path with the roof material heated by sunlight, distribute it, and exit from the air flow path A method for melting snow, wherein air is passed through a heating device and a fan, heated by the heating device, and used for heating via a feed duct.