Circulation flowing water type roof snow melting device

Abstract

To melt snow on a roof at low running cost by a device that can be additionally constructed on an existing building.SOLUTION: Snow is melted at low running cost by a device that can be additionally constructed on an existing building by: gathering falling snow to a valley part with water-repellent paint applied to top surfaces of roof tiles or a top surface of a V-sectioned vertical seam roofing metallic folded-plate roof material; letting water flow onto a top surface of a heat insulation sheet stuck on the valley part to melt the snow at the valley part; collecting the water of the melted snow to a water storage tank; and then cyclically using the water collected in the water storage tank after minimum necessary heating.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a simple device that can be additionally constructed on an existing tile roof or a vertically corrugated metal folded plate roof having a V-shaped cross section, and is a circulating water type roof snow melting device that melts snow at a low running cost.

Background Art

[0002] In areas with heavy snowfall, it is necessary to carry out snow removal work for the purpose of preventing the collapse of buildings and accidents caused by falling snow. However, the snow removal work carried out on the roof has a risk that the worker may fall from the roof, and also requires a great deal of labor for transporting the snow dropped from the roof to the disposal place. Therefore, it is a dangerous and physically burdensome work for elderly households and single-person households, and a roof snow melting device that can be additionally constructed on existing buildings and has low introduction costs and running costs is desired. Existing roof snow melting devices include a sprinkling method, an electric heater method, and a hot water method.

[0003] The sprinkling method is a method of sprinkling groundwater or hot water heated by a boiler over the entire surface of the roof. When all the melted water is drained into the rainwater drainage channel, a large amount of water is required. When using groundwater, the operating cost is relatively low, but a large cost is required for well drilling, and there is a risk of ground subsidence due to the large-scale use of groundwater, and it may not be available when needed due to winter water shortage. In addition, when heating and circulating groundwater or tap water for use, the heat loss due to the contact between the sprinkled water and the atmosphere and the roof surface is large, resulting in a high gas or electricity cost for heating.

[0004] The electric heater method is a method of attaching an electric heating wire covered with an insulating coating to the surface of a metal roof material or roof tile with a metal tape having a high heat transfer rate, and energizing the electric heating wire to melt the snow on the roof. Almost no maintenance is required after installation, but since it is necessary to stretch the electric heating wire over the entire roof, the introduction cost is high and the construction period is long. And since the entire roof is heated, the required amount of heat is large and the heat loss to the atmosphere is also large, so the electricity cost is high.

[0005] In addition, the hot water method is a method of melting snow on the roof by circulating antifreeze heated by a boiler using gas or kerosene as fuel through pipes laid around the inside or surface of the roof. When laying pipes around the inside of the roof, there is an advantage that the appearance of the house does not change, but since the roof needs to be replaced, the introduction cost is high and the construction period is long. And since the entire roof is heated, condensation occurs, and since the amount of heat required to heat the entire roof is large and the amount of heat loss to the atmosphere is also large, the operating cost is high. On the other hand, when laying pipes around the surface of the roof, the introduction cost is low and the construction period is short because the roof does not need to be replaced, but since the amount of heat required to heat the entire roof is large and the amount of heat loss to the atmosphere is also large, the fuel cost becomes high.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0007] The problem to be solved is to melt snow on the roof with a simple device that can be additionally constructed on an existing building at a low running cost.

Means for Solving the Problems

[0008] The present invention mainly features collecting snowfall by a water-repellent paint applied to the surface of roof tiles or a vertically grooved metal corrugated roof material with a V-shaped cross-section to the valleys of the roof tiles or each valley of the vertically grooved metal corrugated roof material with a V-shaped cross-section, melting the snow collected in each valley by water flowing from the top to the rain gutter on the upper surface of the valley, collecting the water after melting the snow in a water storage tank, heating the water pumped up from the water storage tank by the amount of heat required for snow melting, and circulating and using it.

Effects of the Invention

[0009] Unlike the sprinkling method of the present invention's circulating running water type roof snow melting device, which sprinkles groundwater or heated tap water over the entire surface of the roof and allows the water after snow melting to flow out into the rainwater drainage channel, the water collected in the water storage tank after snow melting is heated by the required amount of heat and recycled. Therefore, the amount of water used is extremely small, there is no fear of groundwater depletion, the amount of tap water used is minimal, there is no wasteful heat outflow into the rainwater drainage channel, and the amount of heat required for recycling can be suppressed to the amount of heat required for snow melting.

[0010] Also, unlike the sprinkling method of the present invention's circulating running water type roof snow melting device, which sprinkles groundwater or tap water over the entire surface of the roof, heats it, and recycles it, the snow that skis from the ridges of the roof tiles or the ridges of the vertically grooved metal folded plate roof material with a V-shaped cross-section and gathers in each valley is melted by the running water flowing on the upper surface of the heat insulation sheet attached to the valley. Therefore, the area where the running water directly contacts the atmosphere, roof tiles, or metal folded plate roof material is extremely small, and the amount of heat loss to the atmosphere and the amount of heat loss due to heat conduction to the roof tiles and metal folded plate roof material are also extremely small. Thus, the amount of heat required for heating the water collected in the water storage tank for recycling can be reduced.

[0011] Furthermore, unlike the electric heater method or the hot water method, the circulating running water type roof snow melting device of the present invention melts snow by flowing water through each valley from the topmost roof tile or the uppermost part of the vertically grooved metal folded plate roof material with a V-shaped cross-section to the rain gutter. Therefore, there is no need to stretch electric heaters or pipes over the entire roof, the introduction cost is low, and the construction period is short.

[0012] Also, since the circulating running water type roof snow melting device of the present invention melts snow by flowing water through the valleys of the roof tiles or the valleys of the vertically grooved metal folded plate roof material with a V-shaped cross-section, the ridges of the roof tiles or the vertically grooved metal folded plate roof material with a V-shaped cross-section act as windbreaks, and it has the characteristic of having a small amount of heat loss due to wind.

[0013] The water storage tank that constitutes the present invention is made of heat-insulating material, and is installed for the purpose of ensuring the amount of water required for continuous operation from the start of operation of the pumping pump until the melted water is recovered into the water storage tank and returns to the specified water level, and for the purpose of storing the amount of heat possessed by the stored water. When the amount of water flowing into the water storage tank due to snowmelt increases and exceeds the specified water level of the water storage tank, the amount of water exceeding the specified water level flows out as overflow water through the drainage pipe to the downstream rainwater drainage channel.

[0014] Also, the water temperature detection sensor provided in the water storage tank that constitutes the present invention continuously monitors the water temperature in the water storage tank during the operation of the pumping pump. When the water temperature in the water storage tank drops gently, the discharge amount of the pumping pump is decreased. When the water temperature drops rapidly, the discharge amount of the pumping pump is increased. When the water temperature reaches the set value with the discharge amount of the pumping pump in the maximum state, feedback control to start heating by the heater is performed to suppress the power consumption of the pumping pump and suppress the heat energy required for heating the water for circulation use. Note that a temperature close to the lowest temperature that the downstream rainwater drainage channel can accept is recommended as the set temperature.

[0015] The pumping pump that constitutes the present invention is installed at the upper part of the water storage tank, the discharge amount is variable, it has the ability to pump water to the top of the roof, and is equipped with a heat-insulating pipe connecting the discharge port to the top of the roof and a heater on the heat-insulating pipe path. Note that the heater may be an electric heater or one using gas, kerosene, etc. as fuel.

[0016] The sprinkler pipe that constitutes the present invention has the same number of sprinkler nozzles as the number of valleys in order to sprinkle the water supplied from the heat-insulating pipe to the valleys at the uppermost stage of each row of roof tiles or to the valleys at the top of each longitudinal ridge of a vertically ridged metal roof material with a V-shaped cross-section. Note that when the number of rows of roof tiles or the length of each valley of the metal roof material with longitudinal ridges is different, such as in a multi-gabled structure, the amount of water sprayed by the sprinkler nozzles in each row is adjusted when installing the sprinkler pipe.

[0017] The heater provided in the pumping pump constituting the present invention is installed downstream of the pumping pump and is installed for the purpose of heating only the amount of water pumped up by the pumping pump and supplying it to the downstream side when the water temperature in the water storage tank drops below the set value.

[0018] The snow that has fallen on a tiled roof or a vertically corrugated metal folded plate roof with a V-shaped cross-section skis by the action of the water-repellent paint and gathers in each valley.

[0019] The water pumped from the water storage tank by the pumping pump is delivered to the sprinkler nozzle through the heat-insulating pipe.

[0020] The water sprinkled from the sprinkler nozzle onto each valley of the uppermost row of the tiled roof or each valley of the uppermost part of the vertically corrugated metal folded plate roof with a V-shaped cross-section melts the snow that has gathered in the valley while flowing down along the slope of the roof surface on the heat-insulating sheet attached to the valley.

[0021] The water after melting the snow continues to flow down along the slope of the roof surface on the heat-insulating sheet and is collected in the water storage tank via the rain gutter and the rainwater pipe.

[0022] The water collected in the water storage tank has the dust and sand deposited on the roof surface and the rain gutter removed by the floating foreign matter removal filter and the sand drain.

[0023] Since the amount of water collected in the water storage tank increases due to the melted snow, when the water level in the water storage tank exceeds the specified level because the amount of water collected exceeds the discharge amount of the pumping pump, the excess water flows out to the downstream rainwater drainage path through the drainage pipe by the principle of the siphon.

[0024] When the water level in the water storage tank exceeds the specified level, the excess amount of water flows directly out to the downstream rainwater drainage path from the through pipe through the drainage pipe by the principle of the siphon. Therefore, when the water temperature in the water storage tank is higher than the water temperature of the water after melting the snow, it is possible to suppress the decrease in the water temperature in the water storage tank due to the heat exchange between the entire amount of the cold water after melting the snow collected and the water in the water storage tank.

[0025] After the snowmelt water collected in the water storage tank cools down the water temperature in the tank, if the water temperature detection sensor detects a water temperature equal to or higher than the set temperature, the water in the tank is circulated for snowmelt. Also, by continuously monitoring the water temperature, feedback control is performed to reduce the discharge volume of the pumping pump when the water temperature drops gently and increase the discharge volume of the pumping pump when the water temperature drops rapidly, thereby suppressing the power consumption of the pumping pump.

[0026] If the water temperature detection sensor in the water storage tank detects a water temperature equal to or lower than the set temperature while the pumping pump is operating at its maximum discharge volume, the water pumped from the water storage tank by the pumping pump is heated by the heater and then circulated for snowmelt.

[0027] When snowmelt starts after a large amount of snowfall, the snow on the adjacent ridges of the roof tiles or the adjacent ridges of the vertical corrugated metal folded plate roof material with a V-shaped cross-section support each other to form a so-called bridge. In some cases, even if the snow in the valley is melted, the snow on the ridge cannot slide down to the valley. Therefore, it is recommended to start snowmelt promptly when the snowfall detection sensor detects snowfall.

[0028] By storing the miscellaneous wastewater generated in daily life in the heat exchange tank made of a material with high heat transfer rate installed in the water storage tank, the heat of the miscellaneous wastewater can be transferred to the water in the tank in a short time to increase the water temperature in the tank. Therefore, the heat energy required for heating the water for circulation can be reduced.

Brief Description of the Drawings

[0029]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

[0030] Figure 1 is a configuration diagram of the equipment of an embodiment in the case of a tiled roof of the device of the present invention, and the roof of the building has a tiled hip roof structure. The rainwater or tap water stored in the water storage tank is pumped up from the water storage tank by a pumping pump, delivered to directly below the ridge tile at the top of the building via heat-insulating pipes, and sprinkled from the sprinkler nozzles of the sprinkler pipes laid along the ridge tile to the valleys at the uppermost stage of each row of roof tiles. The snow collected in the valleys of each row of roof tiles by the action of the water-repellent paint applied to the roof tiles is melted by the sprinkled water, and the sprinkled water and the melted water of the snow are collected into the water storage tank via the rain gutter and the rainwater pipe. Since the amount of water recovered into the water storage tank is equal to or greater than the discharge amount of the pumping pump, the amount of water exceeding the specified water level of the water storage tank flows out to the downstream rainwater drainage channel through the drainage pipe. When the water temperature in the water storage tank decreases due to heat exchange with the water after snow melting and the water temperature becomes below the set temperature even when the discharge amount of the pumping pump is at the maximum value, only the amount of water circulated by the heater installed on the downstream side of the pumping pump is heated.

[0031] Figure 2 is a three-view drawing of the roof tiles of the device of the present invention, with a heat-insulating sheet attached to the valleys of the roof tiles and a water-repellent paint applied to the entire working part of the roof tiles.

[0032] Figure 3 is a configuration diagram of the equipment of an embodiment in the case of a vertically corrugated metal folded plate roof with a V-shaped cross-section of the device of the present invention, and the roof of the building has a tiled hip roof structure.

[0033] Figure 4 is a three-view drawing of a vertically corrugated metal folded plate roof material with a V-shaped cross-section of the device of the present invention, with a heat-insulating sheet attached to each valley of the roof material and a water-repellent paint applied to the entire working part of the roof material.

[0034] FIG. 5 is a cross-sectional view of the water storage tank of the device of the present invention. The main purpose of the through pipe at the lower part of the water storage tank is to let the water cooled by heat exchange with snow flow out to the drain pipe. However, when the water level in the water storage tank is lower than the specified level, it also has the role of returning the water after snowmelt to the water storage tank and has an opening for this purpose. Incidentally, in order to reduce the heat exchange amount between the water cooled by heat exchange with snow and the water in the water storage tank, a pipe material made of a heat insulating material is recommended for the through pipe. Also, the drain pipe connected to the downstream of the through pipe rises to the same height as the specified water level of the water storage tank in order to keep the water level in the water storage tank constant and then connects to the rainwater drainage channel on the downstream side.

[0035] The rainwater drainage channel shall be able to receive the water after snowmelt collected in the water storage tank without any problem.

Embodiments for Carrying Out the Invention

[0036] According to "Development of a Water-Saving Snowmelt System Using Groundwater", Transactions of the Japan Society of Civil Engineers No. 492 / (6) - 23, pp77 - 86, June 1994, the total heat required for snowmelt is the heat required to melt the snow and raise the temperature of the melt water to the flowing water temperature, plus the long-wavelength radiant heat released by the flowing water, the sensible heat loss to the atmosphere (air), the heat loss due to evaporation, and the heat loss to the pavement, minus the short-wavelength (solar radiation) radiant heat absorbed by the flowing water. Here, considering that the long-wavelength radiant heat released by the low-temperature flowing water and the short-wavelength (solar radiation) radiant heat absorbed by the flowing water during the snowfall time zone (cloudy days) can be ignored, it is effective to reduce the contact area between the flowing water sprayed from the sprinkler nozzle and the atmosphere to reduce the sensible heat loss to the atmosphere (air) and the heat loss due to evaporation, and to reduce the contact area between the flowing water and the pavement (roof surface in the case of the present invention) and interpose a heat insulating sheet between the flowing water and the pavement (roof surface in the case of the present invention) to reduce the heat loss due to heat conduction to the roof surface. Also, according to the same paper, in nozzle sprinkling, the more water there is and the lower the flowing water temperature, the less wasteful heat loss to the atmosphere during the flow, and the same applies to the heat loss to the pavement (roof surface in the case of the present invention). Therefore, by monitoring the water temperature in the water storage tank where the melted water is recovered, the discharge amount of the pumping pump and the heating amount by the heater are feedback-controlled according to changes in snowfall conditions, outside air temperature, etc., and it is found that it is effective to maintain the temperature of the water circulated for melting at as low a temperature as possible. And it is found that limiting the amount of water in which the cold water after melting snow and the water in the water storage tank are mixed to the amount of water required for circulation use is effective in suppressing the heat energy required for heating the water recovered in the water storage tank for circulation use.

[0037] The horizontal projected area of the gable roof is 80 m with a length of 8 m and a width of 10 m 2 Assume that J-shaped tiles (working width: 265 mm, working length: 235 mm) are laid in 38 rows in parallel on both sides of the ridge tiles, the snowfall amount of snow with a density of 0.08 is 0.02 m per hour, the temperature of the snowfall is 1°C below freezing, the specific heat of the snow is 2.1 J / (g·K), the heat of fusion of the snow is 336 J / (g·K), the temperature of the water pumped from the water storage tank and flowing down from the sprinkling nozzle is 7°C, the specific heat of the water is 4.2 J / (g·K), and the water temperature when the melted snow water is recovered into the water storage tank is 1°C, and consider the amount of energy required for snow melting.

[0038] The snowfall amount on the entire tiled roof is 1.6 m per hour 3 When converted to the amount of water after melting by multiplying the snow density, it is 0.128 m 3Therefore, the snowfall weight per hour is 128,000 g. The amount of heat required to melt the snow and heat it to 1°C water is the sum of the heat required for snow at -1°C to become snow at 0°C, the latent heat of fusion required for 0°C snow to become 0°C water, the heat required for 0°C water to be heated to 1°C, and the heat loss other than melting that is taken away from the water pumped from the water storage tank until it is recovered to the water storage tank after melting the snow. So, assuming that the heat loss other than melting that is taken away from the water pumped from the water storage tank until it is recovered to the water storage tank after melting the snow is the same value as the heat required for 0°C water to be heated to 1°C, the amount of heat required to melt the snow with a density of 0.08 and a thickness of 0.02 m per hour falling on a gable roof with a horizontal projected area of 80 m² is 128,000 g × 2.1 J + 128,000 g × 336 J + 128,000 g × 4.2 J + 128,000 g × 4.2 J = 44,352,000 J.

[0039] Next, the amount of water required for snow melting is the value obtained by dividing the heat required for snow melting by the temperature change amount and specific heat of water. So, when the temperature of the water flowing down from the sprinkler nozzle is 7°C and the water temperature after melting the snow is 1°C, the amount of water required per hour is 44,352,000 J / (6 × 4.2 J) = 1,760,000 g, which is 13.75 times the snowfall weight converted to water.

[0040] Here, since the total amount of water flowing down from the sprinkler nozzle is 1,760,000 g / hour, the amount of water sprayed per hour from one sprinkler nozzle is 1,760,000 g / (38 rows × 2) ≈ 23,158 g / hour. It means that an extremely small amount of water of about 6.4 cc per second is flowing down the valley of the tile roof. And since the height difference between the ridge and valley of a general 53-sheet tile roof is specified to be 3.5 cm or more according to JIS standards, it can be seen that the water flowing down the valley is less affected by heat loss due to wind.

[0041] The water storage volume of the water storage tank needs to be more than the amount of water required for continuous operation from the start of the operation of the pumping pump until the melted water is recovered into the water storage tank and the water level returns to the specified level. Although it should be calculated in detail according to the width of the watering range, the shape of the roof, the length of the piping, the roof slope, the slope of the rain gutter, etc., in the case of the building in paragraph 0037, if the water passing through the longest path is recovered into the water storage tank 5 minutes after the start of the operation of the pumping pump, the required water storage volume will be 1,760 L / 60×5 = 146.667 L or more regardless of the amount of snowfall.

[0042] When melting snow, the water temperature in the water storage tank will be in the range of 1°C to 7°C. However, as the snow melting continues, the water temperature in the water storage tank approaches 1°C, so the temperature difference between the water in the water storage tank and the miscellaneous wastewater passing through the heat exchange tank becomes large, and the amount of heat transfer from the miscellaneous wastewater to the water in the water storage tank increases. Therefore, it is possible to reduce the heat energy required for heating the water recovered into the water storage tank for recycling use.

[0043] Even during the period when snow melting is not required, by repeatedly performing heat exchange between the water in the water storage tank and the miscellaneous wastewater through the heat exchange tank, it is possible to increase the water temperature in the water storage tank and increase the heat energy storage amount in the water storage tank until the next snow melting, so that the heat energy required for heating during the next snow melting can be reduced.

[0044] When the performance of the water-repellent paint applied to the surface of the roof tiles or the vertical corrugated metal folded plate roof material with a V-shaped cross-section deteriorates over time, by attaching a long nozzle to the sprayer and spraying and applying the paint from the ground, the performance can be restored simply and safely without the risk of falling from the roof.

[0045] Instead of applying the water-repellent paint, by attaching a sheet made of water-repellent material to the entire roof surface of the tile roof or the vertical corrugated metal folded plate roof with a V-shaped cross-section, the water-repellent performance can be maintained for a long period.

[0046] It is also possible to utilize the melted rainwater flowing out into the rain drainage channel for melting snow on the passageway, etc., by watering the passageway, etc. using the difference in height between the specified water level of the water storage tank and the ground surface.

Industrial Applicability

[0047] Prevent the depletion of groundwater by melting the snow on the roof using recycled tap water or rainwater, and minimize the heat loss to the atmosphere and the roof surface, thereby minimizing the amount of heat required for heating to melt the snow by recycling water, and melting the snow at a low running cost.

Explanation of Signs

[0048] 1 Building outer wall 2 Snowfall detection sensor 3 Rain gutter 4 Roof tile 5 Ridge tile 6 Foundation 7 Water storage tank 8 Rainwater pipe 9 Water pump 10 Heat-insulated pipe 11 Sprinkler pipe 12 Sprinkler nozzle 13 Floating foreign matter removal filter 14 Sand drain 15 Water-repellent paint coating surface 16 Heat-insulating sheet 17 Drain pipe 18 Liquid level detection sensor 19 Water temperature detection sensor 20 Mesh filter 21 Heater 22 Heat exchange tank 23 Penetrating pipe 24 Opening 25 On-off valve 1 26 On-off valve 2 27 Air vent 28 Vertical corrugated metal roof material with a V-shaped cross-section 29 Building wrap A Rainwater inlet B Tap water supply port C Pump discharge port D Rainwater discharge port E Miscellaneous wastewater supply port F Miscellaneous wastewater discharge port G Specified water level H Ridge I Valley

Claims

1. A circulating water type roof snow melting device, which is composed of a water storage tank made of heat insulating material, a water pump, a water sprinkling pipe, and a tiled roof or a vertically corrugated metal folded plate roof with a V-shaped cross-section, on the surface of which a water-repellent paint is applied. The water storage tank is provided with a tap water supply port for setting the water storage volume at the start of operation to a specified water level, an air vent for facilitating the rise and fall of the water level, a rainwater pipe for drawing in the water after snow melting from the rain gutter on the upstream side, a drainage pipe for discharging the water exceeding the specified water level of the water storage tank to the rainwater drainage channel on the downstream side, and a water temperature detection sensor. The water pump is installed at the upper part of the water storage tank and is equipped with a heat insulating pipe for delivering the water taken from the water storage tank to the top of the roof and a heater for heating the discharged water. The water sprinkling pipe has water sprinkling nozzles for sprinkling the water supplied from the heat insulating pipe to the valleys at the uppermost row of each row of the tiled roof or the valleys at the uppermost part of each row of the vertically corrugated metal folded plate roof with a V-shaped cross-section. By the action of the water-repellent paint, the snow accumulated in the valleys of the roof tiles or the valleys of the vertically corrugated metal folded plate roof material with a V-shaped cross-section is melted by the water flowing down the valleys, and the water after snow melting is collected into the water storage tank via the rain gutter and the rainwater pipe. The water increased in volume due to snow melting is discharged to the rainwater drainage channel on the downstream side. If the water temperature in the water storage tank after collecting the water after snow melting is equal to or higher than the set value, it is recycled to suppress the consumption of tap water. At the same time, the heat loss is reduced by reducing the contact area between the flowing water and the atmosphere and the roof tiles or the vertically corrugated metal folded plate roof material with a V-shaped cross-section, so as to reduce the heat energy required for heating the recycled water.

2. The circulating water type roof snow melting device according to Claim 1, characterized in that a heat insulating sheet is pasted on the upper surface of the valley of the roof tiles or each valley of the vertically corrugated metal folded plate roof material with a V-shaped cross-section.

3. A through-pipe penetrating the inside of the water storage tank is provided at the lower part of the water storage tank. A rainwater pipe is connected to the upstream side of the through-pipe, a drainage pipe is connected to the downstream side of the through-pipe, an opening is provided at the part of the through-pipe passing through the water storage tank, and the drainage pipe rises to the same height as the specified water level of the water storage tank and then is connected to the downstream rainwater drainage channel. By adopting such a structure, after the water level in the water storage tank recovers to the specified water level after the start of operation of the pumping pump, while keeping the water level constant, the amount of water after snowmelt flowing into the water storage tank is made equal to the discharge amount by the pumping pump, and the heat loss amount due to heat exchange between the water in the water storage tank and the water after snowmelt is reduced, so as to reduce the heat energy required for heating the water for circulation use. The circulating flowing water type roof snow melting device according to claim 1, characterized in that.

4. A heater is provided on the downstream side of the pumping pump, and miscellaneous wastewater having a temperature higher than the water temperature in the water storage tank is supplied to a heat exchange tank provided in the water storage tank, so as to increase the temperature difference between the water in the water storage tank and the miscellaneous wastewater, increase the amount of heat transfer from the miscellaneous wastewater to the water in the water storage tank, and increase the amount of heat energy stored in the water storage tank. The circulating flowing water type roof snow melting device according to claim 1, characterized in that.

5. The water temperature in the water storage tank during the operation of the pumping pump is continuously monitored by a water temperature detection sensor, and the discharge amount of the pumping pump and the heating amount by the heater are feedback-controlled based on the change in the water temperature of the water storage tank, so as to suppress the power consumption of the pumping pump and the heat energy required for heating the water for circulation use. The circulating flowing water type roof snow melting device according to claim 1, characterized in that.

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