JP2019039220A - Snow melting panel and snow melting system provided with the same - Google Patents

Abstract

To provide a snow melting panel and a snow melting system equipped with the same, which can prevent snow from being unmelted and improve the thermal efficiency.SOLUTION: The snow melting panel is disposed on the front side of a heat insulation base 52 and a heat insulation base 52, and is provided with a single heat radiation pipe 14 through which hot water flows and a heat radiation plate 56 which contacts the heat radiation pipe 14 and covers the surface of the heat insulation base 52, and the heat radiation pipe 14 is a double pipe in which the gap between the outer pipe 14b and the inner pipe 14a is a forward flow path 61 and the inside of the inner pipe 14a is a return flow path 62.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a snow melting panel that melts snow by passing warm water and a snow melting system including the same.

Conventionally, a snow melting panel that can be easily assembled and constructed at a laying site is known (see Patent Document 1).
This snow melting panel is provided on the combined heat insulating substrate so as to conceal the heat radiating pipe, the combined heat insulating substrate formed with a piping groove for pushing the heat radiating pipe into the top surface, the continuous heat radiating pipe accommodated in the piping groove, and And a heat sink. In the heat radiation pipe, a half of the inflow side is arranged in a spiral shape from the outside to the inside, and a half of the outflow side is arranged in a spiral shape from the inside to the outside. And in the two heat radiating pipes of the adjacent snow melting panels, the outlet of one of the radiating pipes is directly connected to the inlet of the other radiating pipe. That is, in a snow melting apparatus in which a plurality of snow melting panels are installed, the heat radiating pipes of the plurality of snow melting panels are connected in series around the heat source device to constitute a snow melting circuit.

JP 2005-264653 A

In such a conventional snow melting panel, the temperature of the hot water flowing through the heat radiating pipe gradually decreases from the inflow side to the outflow side due to heat radiation from the heat radiating plate. For this reason, the snowfall on the heat radiating plate is not melted uniformly, and there is a problem that the snow remains in the spots. Further, among the plurality of snow melting panels of the snow melting device, there is a problem that the temperature of the hot water is extremely lowered and the snow remains unmelted in the snow melting panel located on the downstream side.
On the other hand, when the hot water temperature on the inflow side is increased in order to prevent the snow from remaining unmelted, there is a problem that the amount of heat escaping into the atmosphere increases and the thermal efficiency (energy efficiency) deteriorates.

  An object of the present invention is to provide a snow melting panel and a snow melting system including the snow melting panel that can prevent snow from remaining unmelted and can improve thermal efficiency.

  The snow melting panel of the present invention comprises a heat insulating base, a single heat radiating pipe that is disposed on the front side of the heat insulating base and through which hot water is passed, and a heat radiating plate that is in contact with the heat radiating pipe and covers the surface of the heat insulating base. The radiating pipe includes a double pipe having a gap between the outer pipe and the inner pipe as an outward flow path and an inner pipe as a return flow path.

  According to this configuration, since the heat radiating pipe is composed of a double pipe, the wall of the inner pipe is placed between the hot water having a high temperature in the forward flow path and the hot water having a low temperature in the return flow path. Heat exchange takes place via For this reason, not only the temperature difference between the hot water in the forward flow path and the hot water in the return flow path is reduced, but the temperature difference in the extending direction of the heat radiating pipe is also reduced. Moreover, since the heat of the hot water is transferred from the outer tube to the heat radiating plate, the heat radiating area can be increased as compared to the conventional heat radiating pipe of the same length, and the heat from the inner tube (return channel) Unnecessary heat escape can be suppressed. Therefore, the temperature distribution of the heat sink can be made uniform, and the thermal efficiency for melting snow can be improved.

  In this case, it is preferable that the heat radiating pipe is formed of a metal pipe and is arranged in a meandering shape in a plan view or a spiral shape in a plan view.

  According to this configuration, the heat radiation efficiency can be improved by making the heat radiation pipe made of metal having high thermal conductivity. Further, the temperature difference between the hot water in the forward flow path and the hot water in the return flow path can be made smaller, and the temperature difference in the extending direction of the heat radiating pipe can also be made smaller.

  In addition, the heat radiating pipe is provided with a double pipe structure connection joint at one end, and a double pipe structure straight pipe end corresponding to the connection joint at the other end. Is preferred.

  According to this structure, the both ends of the heat radiating pipe which is a double pipe can be made into the male-female joining structure. Therefore, in a plurality of snow melting panels, these heat radiating pipes can be directly connected, and a serial piping system can be constructed.

  Similarly, the heat radiating pipe is provided with a double pipe structure connection joint at one end, and a double pipe structure end joint that communicates the forward flow path and the return flow path at the other end. It is preferable that

  According to this configuration, since the forward flow path and the return flow path are communicated at the end by the double pipe end joint, it is possible to configure a hot water circulation flow path that is connected to the outside via one connection joint. it can. Therefore, in a plurality of snow melting panels, these heat radiating pipes can be connected in parallel via an external double-pipe hot water pipe while maintaining the hot water circulation flow path, and a parallel piping system is constructed. be able to.

  Furthermore, it is preferable that the heat radiating pipe is attached to the back surface of the heat radiating plate by a plurality of pipe support members that are in contact with the lower half of the heat radiating pipe.

  According to this configuration, a heat transfer path from the heat radiating pipe to the heat radiating plate can be configured via the plurality of pipe support members. In particular, even when the heat radiating pipe is composed of a plurality of straight pipes and a plurality of joints (having a diameter larger than that of the straight pipe), the straight pipe portion and the heat radiating plate are widened via the plurality of pipe support members. It can be contacted indirectly with area.

  On the other hand, it is preferable that at least a plurality of vertical grooves among a plurality of vertical grooves along the water guide gradient of the installation portion and a plurality of horizontal grooves orthogonal to the plurality of vertical grooves are formed on the surface of the heat radiating plate.

By the way, although the snow (water) melted in contact with the heat sink becomes small water droplets, these eventually gather to form large water droplets and flow down according to the water guiding gradient.
According to this configuration, the water droplets (melted snow) on the radiator plate that has flowed out flow into the nearest vertical groove or horizontal groove. When water (water droplets) flows into the vertical or horizontal groove, the water depth in the groove increases, so that the water flows down smoothly. For this reason, the water droplets on the heat radiating plate are not easily mixed with the subsequent snowfall to form a “rough snow” shape, so that it is possible to smoothly melt and flow the snow.

  The snow melting system of the present invention includes a plurality of the above-described snow melting panels, a hot water source device that circulates hot water to the plurality of snow melting panels, a plurality of snow melting panels and a hot water source device connected by piping, and a hot water circulation channel. A hot water supply pipe comprising a double pipe having a gap between the outer pipe and the inner pipe as a main forward flow path and an inner pipe as a main return flow path. It has a hot water main pipe connected by piping to the snow melting panel.

  According to this configuration, the hot water generated by the hot water source device is circulated and supplied to the plurality of snow melting panels via the hot water supply pipe. In this case, since the hot water main pipe of the hot water supply pipe connected to the plurality of snow melting panels is composed of a double pipe, the temperature of the hot water in the main forward flow path and the hot water in the main return flow path of the hot water main pipe The difference can be reduced, and the temperature difference in the extending direction of the hot water main pipe can also be reduced. In addition, unnecessary heat escape from the inner pipe (main return flow path) of the hot water main pipe can be suppressed, and the overall thermal efficiency can be improved.

  In this case, the plurality of snow melting panels are the snow melting panels according to claim 3, the plurality of snow melting panels are connected in series, and the hot water supply pipe is connected to the hot water source device and the hot water source pipe and hot water And a main branch passage having a double-pipe structure for connecting the hot water main return pipe and the hot water main return pipe and the hot water main pipe. It is preferable that a pipe end joint having a double pipe structure that communicates with the return flow path is provided, and a plurality of snow melting panels are interposed.

  According to this configuration, the main branch joint is disposed in the vicinity of the hot water source device, whereby the hot water main pipe can be kept long, and the temperature difference in the extending direction of the entire hot water supply pipe can be reduced. In addition, since a plurality of snow melting panels are connected in series and are connected to the hot water main pipe (series piping), a hot water circulation channel without branching can be configured. Therefore, the heat radiation amount in the plurality of snow melting panels can be made uniform, and snow melting can be performed efficiently.

  Similarly, the plurality of snow melting panels are the snow melting panels according to claim 4, and the hot water supply pipe includes a hot water source forward pipe and a hot water source return pipe connected to the hot water source device, and a hot water source forward pipe and a hot water source. A double pipe structure original branch joint that connects the return pipe and the hot water main pipe, and the hot water main pipe has a double pipe structure that connects the main forward flow path and the main return flow path to the pipe end. It is preferable that a pipe end joint is provided and a plurality of branch joints having a double pipe structure branched to the plurality of snow melting panels are provided.

  According to this configuration, the main branch joint is disposed in the vicinity of the hot water source device, whereby the hot water main pipe can be kept long, and the temperature difference in the extending direction of the entire hot water supply pipe can be reduced. In addition, since the plurality of snow melting panels are branched from the hot water main pipe (parallel piping), the pipe friction loss of the hot water circulation passage leading to each snow melting panel can be kept low. Thereby, the energy consumption in a warm water circulation can be suppressed or the warm water flow rate in a warm water circulation can be increased, and energy efficiency can be improved.

  Similarly, the plurality of snow melting panels are the snow melting panels according to claim 4, and the hot water supply pipe further includes a hot water source forward pipe and a hot water source return pipe connected to the hot water source device, and the hot water main pipe Is provided with a plurality of branch joints having a double-pipe structure branched to a plurality of snow melting panels, and one of the plurality of branch joints disposed at one end of the hot water main pipe is a hot water One branch joint, which is connected to the main outgoing pipe and constitutes the upstream end of the main outgoing flow path and the upstream end of the main return flow path in the hot water main pipe and is disposed at the other end of the hot water main pipe, It is preferable to configure the downstream end of the main forward flow path and the downstream end of the main return flow path in the hot water main pipe while being connected to the return pipe.

  According to this configuration, the channel lengths of the hot water circulation channels passing through the snow melting panels can be made substantially the same. That is, branch piping from the hot water main pipe to a plurality of snow melting panels (parallel piping) can make the pipe friction loss of the hot water circulation channel passing through each snow melting panel substantially the same. Therefore, in addition to the advantages of the parallel piping described above, the heat radiation amount in the plurality of snow melting panels can be made uniform. When the hot water source device and the plurality of snow melting panels are largely separated from each other, it is preferable that the hot water source forward pipe and the hot water source return pipe are double pipes from the vicinity of the hot water source device.

  On the other hand, the hot water source device controls the hot water heat source section that generates and supplies hot water, the hot water circulation section that circulates the hot water supplied from the hot water heat source section within the hot water circulation channel, and the hot water heat source section and the hot water circulation section. It is preferable that the control unit controls the driving of the hot water heat source unit and the hot water circulation unit based on the detection result of the snowfall detection unit.

  According to this configuration, the snow melting operation can be performed only when snowfall is detected by the control unit that controls the hot water heat source unit and the hot water circulation unit. Therefore, snow melting can be performed efficiently. In addition, it is preferable that the snow melting operation is stopped after a predetermined time (10 minutes to 30 minutes) has elapsed since the snowfall detection unit no longer detects snowfall.

  In this case, the hot water source device further includes a temperature detection unit that detects the outside air temperature, and the control unit performs an anti-freezing operation that prevents the radiation pipe from freezing in a state where the snowfall detection unit does not detect snowfall, In the freeze prevention operation, when the temperature detection unit detects the first predetermined temperature, only the hot water circulation unit is driven, and when the temperature detection unit detects the second predetermined temperature lower than the first predetermined temperature, It is preferable to drive the hot water heat source section and the hot water circulation section.

By the way, the still water begins to freeze when it reaches 0 ° C., but the flowing water does not freeze even when it reaches 0 ° C.
According to this configuration, for example, the first predetermined temperature is set to 0 ° C., and the second predetermined temperature is set to a temperature at which water flowing in the heat radiating pipe freezes (tested in advance), for example, −7 ° C. Control the hot water circulation part. That is, in a state where there is no snowfall, when the outside air temperature falls to the first predetermined temperature, water is circulated (flow) to prevent freezing of the heat radiating pipe, and when the outside air temperature falls to the second predetermined temperature, To prevent the heat-dissipating pipe from freezing. However, the hot water in this case only needs to maintain a temperature of about several degrees Celsius (lower than the temperature at the time of melting snow) in the heat radiating pipe. In this way, as long as the outside air temperature does not become extremely low, freezing is prevented by running water, so that the amount of heat consumed (energy) required for preventing freezing can be extremely reduced.

1 is an overall schematic diagram of a snow melting system according to a first embodiment. It is detail drawing around a warm water circulation part (warm water source device). It is the longitudinal cross-sectional view (a) and cross-sectional view (b) of the snow melting panel which are common to the 1st snow melting panel and the 2nd snow melting panel. It is the piping diagram of the heat radiating pipe in the A type panel of the 1st snow melting panel, Comprising: The piping diagram (a) of a standard size panel, and the piping diagram (b) of a half size panel. It is the piping diagram of the heat radiating pipe in B type panel of a 1st snow melting panel, Comprising: It is the piping diagram (a) of a standard size panel, and the piping diagram (b) of a half size panel. It is a piping diagram of the heat radiating pipe in A type panel of the 2nd snow melting panel, Comprising: It is a piping diagram of a standard size panel. It is a piping diagram of the heat radiating pipe in the B type panel of the second snow melting panel, and is a piping diagram of a standard size panel. It is a piping conceptual diagram which applied the 1st piping pattern to the 1 roof surface. It is the piping schematic diagram (a) in a 1st piping pattern, and a flow-path schematic diagram (b). It is a piping conceptual diagram which applied the 2nd piping pattern to the 1 roof surface. It is the piping schematic diagram (a) in a 2nd piping pattern, and a flow-path schematic diagram (b). It is a piping conceptual diagram which applied the 3rd piping pattern to the 1 roof surface. It is the piping schematic diagram (a) in a 3rd piping pattern, and a flow-path schematic diagram (b).

  Hereinafter, a snow melting panel and a snow melting system including the same according to an embodiment of the present invention will be described with reference to the accompanying drawings. This snow melting system circulates and supplies hot water to a plurality of (a group of) snow melting panels to melt the snow. The plurality of snow melting panels require snow removal on the roof of the building, the rooftop, the entrance passage, etc. Installed in the part. Moreover, the hot water piping used for this is mainly a double pipe in consideration of thermal efficiency.

[Overview]
FIG. 1 is an overall schematic diagram of a snow melting system in which a snow melting panel is installed on a roof of a house. As shown in the figure, the snow melting system 1 includes a plurality of snow melting panels 10 installed on a roof, a hot water source device 11 that circulates hot water to the plurality of snow melting panels 10, and a plurality of snow melting panels 10 and hot water sources. And a hot water supply pipe 12 for connecting the apparatus 11 to the pipe. Each snow melting panel 10 incorporates a heat radiating pipe 14 for melting snow, and a plurality of heat radiating pipes 14 of the plurality of snow melting panels 10 and a hot water supply pipe 12 are used as a hot water circulation channel with the hot water source device 11 as a base point. 15 is configured.

  The hot water heated to a predetermined temperature by the hot water source device 11 is supplied to the plurality of snow melting panels 10 via the hot water circulation channel 15 (hot water supply pipe 12). The hot water supplied to each snow-melting panel 10 flows through the snow-melting panel 10 (heat dissipating pipe 14) for snow melting, and thereafter. It is returned to the hot water source device 11 via the hot water circulation channel 15 (hot water supply pipe 12). In this manner, snow melting in the snow melting panel 10 is performed by continuing the circulating hot water circulation.

  The hot water source device 11 generates and supplies hot water, a hot water heat source unit 21, a hot water circulation unit 22 that circulates the hot water supplied from the hot water heat source unit 21 in the hot water circulation channel 15, and the hot water heat source unit 21 and the hot water circulation. And a control unit 23 (controller) for controlling the unit 22. The hot water source device 11 includes a snowfall detection unit 24 (snowfall sensor) that detects snowfall installed on the roof, and a temperature detection unit 25 (temperature sensor) that detects outside air temperature installed on the roof. The snowfall detection unit 24 and the temperature detection unit 25 are connected to the control unit 23.

  The hot water heat source unit 21 may be a boiler dedicated to melting snow or the like, but is preferably used also as a hot water heater or hot water heater, a heating boiler, or the like. The hot water heat source unit 21 of the embodiment is composed of an instantaneous water heater (gas) that combines hot water supply and snow melting. The instantaneous water heater is activated (ignited) by a running water switch (not shown) provided inside.

  As shown in FIG. 2, the hot water circulation unit 22 is configured by incorporating a circulation pump 32, a small tank 33, and the like in a housing 31. A return pipe 34 in the casing is connected to the suction port of the circulation pump 32, and an outgoing pipe 35 in the casing is connected to the discharge port. A small tank 33 is interposed in the in-housing pipe 35, and an in-housing replenishment water pipe 37 connected to the water supply pipe 36 is connected to the small tank 33. The hot water circulation channel 15 is filled and replenished with water through this small tank 33. Although not shown in the drawing, an air vent valve is appropriately provided in the in-housing pipe 35.

  On the other hand, the heat source return pipe 41 that connects the hot water heat source section 21 and the hot water circulation section 22 is connected to the in-housing pipe 35 via the three-way valve 42, and the heat source outgoing pipe 43 is directly connected to the in-housing outgoing pipe 35. Has been. The three-way valve 42 constructs a transit flow path in which the hot water discharged from the circulation pump 32 flows via the heat source return pipe 41 and the heat source forward pipe 43 via the hot water heat source section 21, and the hot water heat source section 21. When the bypass flow path that flows without going through is constructed, the flow path can be switched.

  Although details will be described later, the control unit 23 performs the first freeze prevention operation and the second freeze prevention operation in addition to the snow melting operation. In the snow melting operation and the second freezing operation, the above-described bypass flow path is constructed by the three-way valve 42, and in the first freezing prevention operation, the above-described bypass flow path is constructed by the three-way valve 42 (details will be described later). ). The control unit 23 is accommodated in the housing 31 of the hot water circulation unit 22.

  By the way, in the snow melting system 1 of the present embodiment, the number of the group of snow melting panels 10 that the hot water source device 11 is responsible for, the minimum temperature in the area where the snow melting panels 10 are installed, the amount of snow accumulation, etc. Various types of piping patterns P are prepared. Although details will be described later, in the first piping pattern P1, the hot water circulation channel 15 is connected in series to the plurality of snow melting panels 10 (see FIG. 8 and FIG. 9), and the second and third piping patterns P2. , P3, the hot water circulation channel 15 is connected in parallel to the plurality of snow melting panels 10 (see FIGS. 10 to 13).

  Similarly, two types of snow melting panels 10 with different piping configurations of the heat radiating pipe 14 are prepared, and there are a plurality of types having different sizes for each piping configuration (the embodiment has a standard size and a half size). 2 types) are prepared. Although details will be described later, the first snow melting panel 10A is a general one, and the heat radiating pipe 14 has a meandering pipe form (see FIGS. 4 and 5). The second snow melting panel 10B is of a type having a large heat radiation area, and the heat radiation pipe 14 has a spiral piping configuration (see FIGS. 6 and 7). Further, in the first snow melting panel 10A and the second snow melting panel 10B, “A type panels 10Aa and 10Ba” (see FIGS. 4 and 6) used for the first piping pattern P1, and the second and “B type panels 10Ab and 10Bb” (see FIGS. 5 and 7) used for the third piping patterns P2 and P3 are prepared.

  Here, the first snow melting panel 10A and the second snow melting panel 10B will be described first, and then the first piping pattern P1, the second piping pattern P2, and the third piping pattern P3 of the hot water supply piping 12 will be described. I will explain in order.

[First snow melting panel]
FIG. 3 is a longitudinal sectional view (a) and a transverse sectional view (b) of the snow melting panel 10 common to the first snow melting panel 10A and the second snow melting panel 10B, and FIG. 4 shows the first snow melting panel 10A. It is the piping diagram (a) of standard size panel 10AaN and the piping diagram (b) of half size panel 10AaH showing the piping form of the heat radiating pipe 14 in A type panel 10Aa. As shown in these drawings, the snow melting panel 10 is configured by accommodating a heat insulating base 52, a single heat radiating pipe 14, and a plurality of spacers 53 in a rectangular case 51. The heat radiating pipe 14 is arranged in a meandering manner in the case 51.

  As shown in FIG. 3, the case 51 has a lower case 55 and a heat radiating plate 56 that also serves as the upper case. The lower case 55 is made of resin or metal, and the heat radiating plate 56 is made of metal such as stainless steel or aluminum. It is composed of a plate material. The lower case 55 and the heat radiating plate 56 are joined to each other through a seal material 57 (packing) around the four sides, so that the water tightness in the case 51 is achieved.

  A plurality of vertical grooves 56 a and a plurality of horizontal grooves 56 b (lattice-shaped grooves) are formed on the surface of the heat radiating plate 56 by press molding or the like. The snow melted on the heat radiating plate 56 flows into the vertical grooves 56a or the horizontal grooves 56b, and flows down along the vertical grooves 56a mainly along the water guide gradient. As a result, the water droplets on the heat radiating plate 56 are not mixed with the subsequent snowfall and become gritty, and the snow melting and the flow thereof are performed quickly.

  Each spacer 53 is disposed between a straight pipe portion and a straight pipe portion of the heat radiating pipe 14 piped in a meandering manner. That is, the straight pipe portions of the heat radiating pipe 14 and the spacers 53 are arranged so as to be alternately positioned in the vertical direction. The spacer 53 is made of, for example, a hollow resin material and holds the heat sink 56 so that the heat sink 56 is not deformed by a load applied to the heat sink 56. In particular, in the snow melting panel 10 installed in the entrance passage or the like, there is a possibility that a person or the like may get on, but the plurality of spacers 53 prevent the heat sink 56 from being deformed. In addition, in the snow melting panel 10 installed in a passage or the like, it is preferable to stick a non-slip sheet or the like on the surface of the heat radiating plate 56.

  The heat insulating base 52 is disposed in the case 51 so as to fill the remaining space such as the heat radiating pipe 14 and the spacer 53. The heat insulating base 52 is made of a heat insulating material such as expanded polystyrene or expanded polyethylene. A pipe housing groove 52a for housing the meandering heat radiating pipe 14 is formed on the surface of the heat insulating base 52, and the heat radiating pipe 14 is piped so as to be fitted into the pipe housing groove 52a.

  In addition, the heat radiating pipe 14 accommodated in the pipe accommodating groove 52a is attached to the back surface of the heat radiating plate 56 by a plurality of pipe support members 58 that are in contact with the lower half portion thereof. The pipe support member 58 in this case also serves as a member that conducts heat of the heat radiating pipe 14 to the heat radiating plate 56, and is formed sufficiently long in the extending direction by stainless steel, aluminum, or the like. The heat radiating pipe 14 of the embodiment is fixed to the back surface of the heat radiating plate 56 by a plurality of pipe support members 58 by welding or the like. In this state, the heat radiating pipe 14 is incorporated in the lower case 55 in which the heat insulating base 52 and the spacer 53 are incorporated. It has become.

  FIG. 4A shows a standard size panel 10AaN of the A type panel 10Aa. As shown in the figure, the heat radiating pipe 14 is arranged in a serpentine shape in a plan view in the case 51. The heat radiating pipe 14 is formed of a stainless steel double pipe. Specifically, the stainless steel outer tube 14b is made two sizes larger than the stainless steel inner tube 14a, the forward flow path 61 is formed in the gap between the outer tube 14b and the inner tube 14a, and the inside of the inner tube 14a. A return flow path 62 is configured. That is, the forward flow path 61 and the return flow path 62 that are a part of the hot water circulation flow path 15 are formed in the heat radiating pipe 14 formed of a double pipe.

  Needless to say, the meandering heat radiating pipe 14 is formed by arranging a joint having a double pipe structure at a bent portion and connecting these joints with a straight pipe having a double structure. A double pipe structure connection joint 64 for connection to the outside is provided at one end of the heat radiating pipe 14, and a double pipe structure connection for connection to the outside is provided at the other end. A tube end 65 is provided. The connection joint 64 and the straight pipe end portion 65 are in a male-female joint relationship, and the connection joint 64 is constituted by, for example, a one-touch socket joint (double pipe structure).

  The connection joint 64 is disposed at the lower right side of the front view of the A type panel 10Aa (standard size panel 10AaN), and the straight pipe end portion 65 is disposed at the lower left side of the A type panel 10Aa (standard size panel 10AaN). ing. In this case, the distance from the lower side of the A type panel 10Aa to the connection joint 64 and the distance from the lower side of the A type panel 10Aa to the straight pipe end 65 are set to the same distance. Therefore, when the plurality of A type panels 10Aa are arranged side by side, the connection joint 64 of one radiating pipe 14 of the adjacent A type panel 10Aa can be directly connected to the straight pipe end portion 65 of the other radiating pipe 14. (See FIG. 8). In addition, the code | symbol 66 in a figure is the work space provided in order to join the connection coupling 64 and the straight pipe end part 65. FIG. The predetermined positions of the connection joint 64 and the straight pipe end 65 in the A type panel 10Aa are arbitrary as long as the heat radiating pipes 14 of the adjacent A type panel 10Aa can be directly connected to each other.

  FIG. 4B shows a half size panel 10AaH of the A type panel 10Aa. As shown in the figure, in this case as well, the heat radiating pipe 14 is arranged in a meandering manner in a plan view in the case 51, and is composed of a stainless steel double pipe. A double pipe structure connection joint 64 is provided at one end of the heat radiating pipe 14, and a straight pipe end 65 of double pipe structure is provided at the other end.

  Also in this case, like the standard size panel 10AaN, the connection joint 64 is disposed at a predetermined position on the lower right side of the half size panel 10AaH when viewed from the front, and the straight pipe end portion 65 is located at the lower left side of the half size panel 10AaH when viewed from the front. Are disposed at predetermined positions. Therefore, even when the standard size panel 10AaN and the half size panel 10AaH are arranged side by side, the heat radiating pipes 14 can be directly connected to each other (see FIG. 8).

  As described above, in the A type panel 10Aa of the first snow melting panel 10A, since the heat radiating pipe 14 is composed of a meandering double pipe, the warm water on the forward side is transferred from the connection joint 64 to the straight pipe end 65. The return-side hot water flows through the return flow path 62 from the straight pipe end portion 65 toward the connection joint 64. The hot water flowing in the forward flow path 61 is radiated to the heat radiating plate 56 via the outer tube 14b and the pipe support member 58, and is used for melting snow. On the other hand, the hot water flowing through the forward flow path 61 and the hot water flowing through the return flow path 62 are heat-exchanged via the inner pipe 14a.

  For this reason, not only the temperature difference between the hot water in the forward flow path 61 and the warm water in the return flow path 62 is reduced, but also the temperature difference in the extending direction of the heat radiating pipe 14 is reduced. Moreover, since the heat of the hot water is transferred from the outer tube 14b to the heat radiating plate 56, the heat radiating area can be increased as compared with the conventional one having the same length, and the inner tube 14a (return channel 62). ) Unnecessary heat escape from the Therefore, the temperature distribution of the heat radiating plate 56 can be made uniform, and the thermal efficiency for melting snow can be improved. In the present embodiment, two types of snow melting panels 10 are prepared, that is, the standard size panel 10AaN and the half size panel 10AaH.

  FIG. 5 shows a piping configuration of the heat radiating pipe 14 in the B type panel 10Ab of the first snow melting panel 10A. FIG. 5A shows the standard size panel 10AbN, and FIG. 5B shows the half size panel 10AbH. Represents. As shown in FIG. 5A, also in the B type panel 10Ab, the heat radiating pipe 14 is arranged in a serpentine shape in a plan view in the case 51, and is constituted by a stainless steel double pipe.

  In this case, the heat radiating pipe 14 is provided with a double pipe structure joint 64 for connection to the outside at one end, and the forward flow path 61 and the return flow path 62 are communicated with the other end. A terminal joint 67 having a double pipe structure is provided. And the connection joint 64 is comprised by the L-shaped joint (double pipe structure) in order to connect with the hot water main pipe 73 mentioned later in the back side of B type panel 10Ab. On the other hand, the terminal joint 67 is connected to the pipe end of the outer pipe 14b of the heat radiating pipe 14 and is not shown in detail, and is a joint body that serves as a folded portion (communication portion) between the forward flow path 61 and the return flow path 62. And several space pieces interposed between the inner tube 14a and the outer tube 14b.

  FIG. 5B shows a half size panel 10AbH of the B type panel 10Ab. As shown in the figure, in this case as well, the heat radiating pipe 14 is arranged in a meandering manner in a plan view in the case 51, and is composed of a stainless steel double pipe. A double pipe structure connection joint 64 is provided at one end of the heat radiating pipe 14, and a double pipe structure terminal joint 67 is provided at the other end.

  As described above, in the B type panel 10Ab of the first snow melting panel 10A, since the heat radiating pipe 14 is composed of a meandering double pipe, the warm water on the outgoing side is directed from the connection joint 64 toward the terminal joint 67. The return-side hot water flows through the forward flow path 61 and flows through the return flow path 62 from the terminal joint 67 toward the connection joint 64. That is, the hot water flowing in from the connection joint 64 is turned back at the terminal joint 67 and flows out from the connection joint 64. The hot water flowing in the forward flow path 61 is radiated to the heat radiating plate 56 via the outer tube 14b and the pipe support member 58, and is used for melting snow. On the other hand, the hot water flowing through the forward flow path 61 and the hot water flowing through the return flow path 62 are heat-exchanged via the inner pipe 14a.

  For this reason, like the A type panel 10Aa, the temperature difference in the extending direction of the heat radiating pipe 14 is reduced, and the heat radiating area can be increased. Further, unnecessary heat escape from the inner tube 14a (return channel 62) can be suppressed. Therefore, the temperature distribution of the heat radiating plate 56 can be made uniform, and the thermal efficiency for melting snow can be improved.

[Second snow melting panel]
Next, the A type panel 10Ba (standard size panel 10BaN) of the second snow melting panel 10B will be described with reference to FIG. 6, and the B type panel 10Bb of the second snow melting panel 10B will be described with reference to FIG. (Standard size panel 10BbN) will be described.
As shown in FIG. 6, in the A type panel 10Ba, the heat radiating pipe 14 is piped in a spiral shape (square spiral shape) in a plan view in the case 51. Specifically, one half of the heat radiating pipe 14 is piped clockwise from the outside to the inside, and the other half is piped counterclockwise from the inside to the outside.

  Also in this case, the heat radiating pipe 14 is formed of a stainless steel double pipe, and a connection joint 64 having a double pipe structure is provided at one end, and a double pipe structure is provided at the other end. The straight pipe end portion 65 is provided. The connection joint 64 is disposed at a predetermined position at the lower right of the A type panel 10Ba when viewed from the front, and the straight pipe end portion 65 is disposed at a predetermined position at the lower left of the A type panel 10Ba when viewed from the front. . Therefore, even when a plurality of A type panels 10Ba are arranged side by side, the heat radiating pipes 14 can be directly connected to each other. Note that the half-size panel 10BaH is also prepared for the A type panel 10Ba, but the description thereof is omitted here.

  In this way, in the A type panel 10Ba of the second snow melting panel 10B, since the heat radiating pipe 14 is formed of a spiral double pipe, the warm water on the outgoing side is transferred from the connection joint 64 to the straight pipe end 65. The return-side hot water flows through the return flow path 62 from the straight pipe end portion 65 toward the connection joint 64. The hot water flowing in the forward flow path 61 is radiated to the heat radiating plate 56 via the outer tube 14b and the pipe support member 58, and is used for melting snow. On the other hand, the hot water flowing through the forward flow path 61 and the hot water flowing through the return flow path 62 are heat-exchanged via the inner pipe 14a.

  For this reason, similarly to the first snow melting panel 10A, the temperature difference in the extending direction of the heat radiating pipe 14 is reduced, and the heat radiating area can be increased. Further, unnecessary heat escape from the inner tube 14a (return channel 62) can be suppressed. Therefore, the temperature distribution of the heat radiating plate 56 can be made uniform, and the thermal efficiency for melting snow can be improved.

  As shown in FIG. 7, also in the B type panel 10Bb, the heat radiating pipe 14 is arranged in a spiral shape in a plan view in the case 51, and is formed of a stainless steel double pipe, similarly to the A type panel 10Ba. . The heat radiating pipe 14 in this case is entirely wound in a clockwise direction from the outside to the inside. The heat radiating pipe 14 has a double pipe structure connecting joint 64 at one end, and a double pipe structure in which the forward flow path 61 and the return flow path 62 communicate with each other at the other end. A terminal joint 67 is provided. The B type panel 10Bb also has a half size panel 10BbH, but the description thereof is omitted here.

  Thus, in B type panel 10Bb of the 2nd snow melting panel 10B, since the heat radiating pipe 14 is comprised by the spiral double tube, the warm water of the going side is toward the terminal coupling 67 from the connection coupling 64. The return-side hot water flows through the forward flow path 61 and flows through the return flow path 62 from the terminal joint 67 toward the connection joint 64. That is, the hot water flowing in from the connection joint 64 is turned back at the terminal joint 67 and flows out from the connection joint 64. The hot water flowing in the forward flow path 61 is radiated to the heat radiating plate 56 via the outer tube 14b and the pipe support member 58, and is used for melting snow. On the other hand, the hot water flowing through the forward flow path 61 and the hot water flowing through the return flow path 62 are heat-exchanged via the inner pipe 14a.

  For this reason, similarly to the A type panel 10Ba, the temperature difference in the extending direction of the heat radiating pipe 14 is reduced, and the heat radiating area can be increased. Further, unnecessary heat escape from the inner tube 14a (return channel 62) can be suppressed. Therefore, the temperature distribution of the heat radiating plate 56 can be made uniform, and the thermal efficiency for melting snow can be improved.

[First piping pattern]
Next, with reference to FIG. 8 and FIG. 9, the 1st piping pattern P1 of the hot water supply piping 12 is demonstrated. In the first piping pattern P1, a plurality of snow melting panels 10 are connected in series. As the snow melting panel 10, the A type panel 10Aa of the first snow melting panel 10A and the A type of the second snow melting panel 10B are used. One of the panels 10Ba is used. Hereinafter, a case where the A type panel 10Aa of the first snow melting panel 10A is used will be described as an example.

  The hot water supply pipe 12 is a hot water main pipe 71 and a hot water main return pipe 72 connected to the hot water source device 11 (hot water circulation unit 22), and a hot water main pipe connected to a plurality of A type panels 10Aa (snow melting panels 10). 73, and a hot water source forward pipe 71 and a hot water source return pipe 72 and a hot water main pipe 73, and a double branch structure original branch joint 74 (see FIG. 1 and FIG. 9A). In the hot water source forward pipe 71 connected to the in-casing forward pipe 35 of the hot water circulation section 22, a main forward flow path 76 of the hot water circulation flow path 15 is formed inside the casing in-housing 35. Similarly, in the hot water return pipe 72 connected to the return pipe 34 in the casing of the hot water circulation section 22, a main return path 77 of the hot water circulation path 15 is formed inside the return pipe 34 in the casing. .

  On the other hand, in the hot water main pipe 73, the gap between the outer pipe 73 a and the inner pipe 73 b is the main forward flow path 76 of the hot water circulation path 15, and the inside of the inner pipe 73 b is the main return path 77 of the hot water circulation path 15. It consists of a double pipe. The main branch joint 74 has an outgoing pipe port 74a to which the hot water original outgoing pipe 71 is connected, a return pipe port 74b to which the hot water original return pipe 72 is connected, and a double pipe port 74c to which the hot water main pipe 73 is connected. The main forward flow path 76 on the hot water main return pipe 71 side and the main forward flow path 76 on the hot water main pipe 73 side communicate with each other, and the main return flow path 77 of the hot water main return pipe 72 and the hot water main pipe 73 side The main return channel 77 is in communication (see FIG. 9A).

  The hot water main pipe 73 is provided with a plurality of snow melting panels 10 (A type panels 10Aa). A pipe end joint 78 having a double pipe structure that communicates the main forward flow path 76 and the main return flow path 77 is provided at the pipe end of the hot water main pipe 73. The pipe end joint 78 constitutes a turning point of the hot water circulation passage 15 (hot water supply pipe 12), and the hot water used for heat dissipation flows in the opposite direction from the pipe end joint 78 in the double pipe. Go. The pipe end joint 78 has the same structure as the terminal joint 67 described above.

  As shown in FIG. 8, the group (plurality) of snow melting panels 10 (A type panel 10Aa) installed on the roof are installed in three stages in the vertical direction. As described above, each snow melting panel 10 is composed of an A type panel 10Aa, and in each of the plurality of A type panels 10Aa at each stage, the half size panel 10AaH is disposed at the outermost end, and a plurality of the snow melting panels 10AaH are provided between the half size panels 10AaH. Standard size panel 10AaN is arranged.

  In this case, in the plurality of A type panels 10Aa at each stage, the straight pipe end portion 65 of the other heat radiating pipe 14 is connected to the connection joint 64 of one heat radiating pipe 14, and the heat radiating pipes 14 are directly connected to each other. Therefore, the hot water main pipe 73 includes a plurality of lower A type panels 10Aa directly connected, a plurality of middle A type panels 10Aa directly connected, and a plurality of upper A type panels 10Aa directly connected. It is a form that was installed.

  As described above, according to the first piping pattern P1, the hot water circulation flow path 15 including the main forward flow path 76, the forward flow path 61, the return flow path 62, and the main return flow path 77 is connected in series without branching. It is piped. In addition, the main body of the hot water supply pipe 12 is a double pipe. For this reason, the temperature difference in the extending direction of the entire hot water supply pipe 12 can be reduced, and unnecessary heat escape can be suppressed. Therefore, the heat radiation amount in the plurality of snow melting panels 10 can be made uniform, and snow melting can be performed efficiently. The hot water supply pipe 12 is preferably a resin pipe or a metal pipe.

[Second piping pattern]
Next, with reference to FIG. 10 and FIG. 11, the 2nd piping pattern P2 of the hot water supply piping 12 is demonstrated. In the second piping pattern P2, a plurality of snow melting panels 10 are connected in parallel to the hot water supply pipe 12 (hot water main pipe 73). In this case, as the snow melting panel 10, either the B type panel 10Ab of the first snow melting panel 10A or the B type panel 10Bb of the second snow melting panel 10B is used. Hereinafter, a case where the B type panel 10Ab of the first snow melting panel 10A is used will be described as an example.

  Also in this case, the hot water supply pipe 12 is connected to the hot water source forward pipe 71 and the hot water source return pipe 72 connected to the hot water source apparatus 11 (hot water circulation unit 22), and a plurality of B type panels 10Ab (snow melting panel 10). A hot water main pipe 73 (double pipe), and a hot water main outgoing pipe 71 and a hot water main return pipe 72 and a hot water main pipe 73 and a main branch joint 74 having a double pipe structure (FIG. 1). And FIG. 11 (a)).

  The hot water main pipe 73 rises to the position of the roof, and further extends in a meandering manner along the snow melting panel 10 (B type panel 10Ab) installed in three stages. Also in this case, a pipe end joint 78 having a double-pipe structure serving as a turning point of the hot water circulation passage 15 is provided at the pipe end of the hot water main pipe 73. A hot water main pipe 73 extending in a meandering manner is provided with a branch joint 81 having a double pipe structure corresponding to each B type panel 10Ab. The hot water main pipe 73 is connected to the B type panel 10Ab ( The connection joint 64) is connected. Each branch joint 81 is constituted by a T-shaped joint having a double pipe structure, and a plurality of B type panels 10 Ab are connected in parallel to the hot water main pipe 73.

  Thus, according to the 2nd piping pattern P2, the hot water main pipe 73 which is a double pipe can be carried out long, and the temperature difference in the extending direction of the whole warm water supply piping 12 can also be made small. Further, since the plurality of snow melting panels 10 are branched from the hot water main pipe 73 (parallel piping), the pipe friction loss of the hot water circulation passage 15 reaching each snow melting panel 10 can be suppressed to a low level. Thereby, the energy consumption required for the hot water circulation can be suppressed, or the hot water flow rate in the hot water circulation can be increased, and the energy efficiency can be improved.

[Third piping pattern]
Next, with reference to FIG. 12 and FIG. 13, the 3rd piping pattern P3 of the warm water supply piping 12 is demonstrated. The third piping pattern P3 is formed by connecting a plurality of snow melting panels 10 in parallel to the hot water supply piping 12 in the same manner as the second piping pattern P2. Further, as the snow melting panel 10, either the B type panel 10Ab of the first snow melting panel 10A or the B type panel 10Bb of the second snow melting panel 10B is used. Hereinafter, a case where the B type panel 10Ab of the first snow melting panel 10A is used will be described as an example.

  The hot water supply pipe 12 in this case is provided with a hot water main pipe 73 (double pipe) corresponding to the B type panel 10Ab (snow melting panel 10) on the roof, and a hot water main outgoing pipe 71 and a hot water main return pipe 72 are provided. It extends to the roof and is connected to the hot water main pipe 73. A hot water main pipe 73 extending in a meandering manner on the roof is provided with a branch joint 81 having a double pipe structure corresponding to each B type panel 10Ab, and the hot water main pipe 73 is B type via the branch joint 81. It is connected to the panel 10Ab (the connection joint 64).

  The plurality of branch joints 81 include a start-end branch joint 81 </ b> A serving as a first branch (branch to the B type panel 10 </ b> Ab at the lower right end) disposed at one end of the hot water main pipe 73, and the other end of the hot water main pipe 73. A terminal branch joint 81B to be the last branch (branch to the B type panel 10Ab at the upper left end) disposed at the end, and a plurality of intermediates disposed between the start branch joint 81A and the terminal branch joint 81B The branch joint 81C includes a start end branch joint 81A, a terminal branch joint 81B, and an intermediate branch joint 81C having different forms.

  The intermediate branch joint 81C is a T-shaped joint having a double pipe structure including a T-shaped joint part connected to the outer pipe 73a and a T-shaped joint part connected to the inner pipe 73b, similarly to the branch joint 81 described above. It is configured. On the other hand, the start-end branch joint 81A has a double structure composed of a T-shaped joint part connected to the outer pipe 73a and an L-shaped joint part connected to the inner pipe 73b. It is connected to the pipe 71. On the contrary, the terminal branch joint 81B has a double structure including an L-shaped joint portion connected to the outer pipe 73a and a T-shaped joint portion connected to the inner pipe 73b. It is connected to the return pipe 72 (see FIG. 13A).

  That is, among the plurality of branch joints 81, the start end branch joint 81 </ b> A disposed at one end of the hot water main pipe 73 is connected to the hot water main forward pipe 71 and upstream of the main forward flow path 76 in the hot water main pipe 73. The terminal branch joint 81B that constitutes the end and the upstream end of the main return flow channel 77 and is disposed at the other end of the hot water main pipe 73 is connected to the hot water return pipe 72 and the main forward flow in the hot water main pipe 73 The downstream end of the path 76 and the downstream end of the main return channel 77 are configured (refer to FIG. 13B). In other words, the branch portion of the main forward flow path 76 closest to the hot water circulation section 22 and the branch portion of the main forward flow path 76 farthest from the hot water circulation section 22 are in the same position, and the main travel farthest from the hot water circulation section 22. The branch portion of the flow channel 76 and the branch portion of the main forward flow channel 76 closest to the hot water circulation unit 22 are at the same position.

  As described above, according to the third piping pattern P3, by using the start-end branch joint 81A and the end-branch joint 81B, the channel lengths of the hot water circulation channels 15 reaching the snow melting panels 10 can be made the same. it can. That is, the pipe friction loss of the hot water circulation passage 15 passing through each snow melting panel 10 can be made substantially the same. Therefore, in addition to the advantage of the second piping pattern P2, the heat radiation amount in the plurality of snow melting panels 10 can be made uniform. In addition, it is preferable to make the warm water source forward pipe 71 and the warm water source return pipe 72 into a double pipe from the vicinity of the hot water source apparatus 11 using an appropriate joint.

[Control method]
Next, the control method of the snow melting system 1 by the control part 23 is demonstrated, referring FIG. 1 and FIG. The control unit 23 directly controls the circulation pump 32 and the three-way valve 42 of the hot water circulation unit 22 and indirectly controls the hot water heat source unit 21. As described above, the control unit 23 selectively controls these devices and instruments to perform the snow melting operation, and also performs the first anti-freezing operation and the second anti-freezing operation.

  In the snow melting operation, when the snowfall detection unit 24 detects snowfall, the control unit 23 drives the circulation pump 32 and switches the three-way valve 42 to establish a via path. When the circulation pump 32 is driven, warm water (water) flows through the warm water circulation channel 15 including the via channel. When warm water flows through the passage, the flowing water switch of the warm water heat source unit 21 (instantaneous water heater) works to ignite the burner of the warm water heat source unit 21. Thereby, warm water of a predetermined temperature is generated, and the warm water circulates in the warm water circulation channel 15.

  On the other hand, when the snowfall detection unit 24 stops detecting snowfall, the control unit 23 stops driving the circulation pump 32 after a predetermined time and changes from the via-flow path to the bypass flow path via the three-way valve 42. Switch. In this case, the delay time from the non-detection of the snowfall detection unit 24 to the stop of the circulation pump 32 is preferably 10 minutes to 30 minutes. In this way, the control unit 23 in the snow melting operation drives the hot water heat source unit 21 (instant water heater) and the hot water circulation unit 22 (the circulation pump 32 and the three-way valve 42) based on the detection result of the snowfall detection unit 24. Control. In addition, it is preferable to provide a temperature sensor on the surface of any one of the snow melting panels 10 and set the hot water temperature of the hot water heat source unit 21 based on the surface temperature of the snow melting panels 10 (improvement of thermal efficiency).

  By the way, in a snowy region (cold region), if the snowfall detecting unit 24 is in a non-detecting state and the outside air temperature falls below the freezing point, the heat radiating pipe 14 (inside water) may be frozen. On the other hand, there is an empirical rule that running water is difficult to freeze. Therefore, in the present embodiment, a primary anti-freezing operation that prevents freezing by circulating water (water that is not heated) and a secondary anti-freezing operation that prevents freezing by circulating hot water are performed. Yes.

  In the first freezing prevention operation, the control unit 23 drives only the hot water circulation unit 22 when the temperature detection unit 25 detects the first predetermined temperature in a state where the snowfall detection unit 24 does not detect snowfall. Specifically, for example, when the temperature detection unit 25 detects an outside air temperature of 0 ° C., the circulation pump 32 is driven by switching from the bypass flow path to the bypass flow path. Thereby, water circulates through the hot water circulation passage 15. That is, in a state where the outside air temperature does not become extremely low, freezing is prevented by running water.

  In the second anti-freezing operation, the control unit 23 causes the hot water heat source when the temperature detection unit 25 detects a second predetermined temperature lower than the first predetermined temperature while the snow detection unit 24 does not detect snow. The unit 21 and the hot water circulation unit 22 are driven. Specifically, when the outside air temperature further decreases from 0 ° C. and reaches −7 ° C., the hot water source 21 and the circulation pump 32 are driven by switching from the bypass channel to the via channel. Thereby, hot water circulates through the hot water circulation channel 15. However, the hot water temperature in this case is preferably set to be lower than the hot water temperature during snow melting.

  As described above, since the freeze prevention operation is switched in two stages, the energy consumption required for the freeze prevention can be kept low.

  DESCRIPTION OF SYMBOLS 1 ... Snow melting system, 10 ... Snow melting panel, 10A ... 1st snow melting panel, 10B ... 2nd snow melting panel, 10Aa, 10Ba ... A type panel, 10Ab, 10Bb ... B type panel, 11 ... Hot water source apparatus, 12 ... Hot water supply pipe, 14 ... radiation pipe, 14a ... inner pipe, 14b ... outer pipe, 15 ... warm water circulation channel, 21 ... warm water heat source part, 22 ... warm water circulation part, 23 ... control part, 24 ... snowfall detection part, 25 DESCRIPTION OF SYMBOLS ... Temperature detection part, 32 ... Circulation pump, 42 ... Three-way valve, 52 ... Heat insulation base, 56 ... Heat sink, 56a ... Vertical groove, 56b ... Horizontal groove, 58 ... Pipe support member, 61 ... Outward flow path, 62 ... Return flow 64, connection joint, 65 ... straight pipe end, 67 ... terminal joint, 71 ... warm water source return pipe, 72 ... warm water source return pipe, 73 ... warm water main pipe, 73a ... outer pipe, 73b ... inner pipe, 78 ... Pipe end joint, 81 ... Branch joint, 81A ... Start end branch Hand, 81B ... terminating branch connection, P ... piping patterns, P1 ... first piping pattern, P2 ... second piping pattern, P3 ... third pipe pattern

Claims (12)

An insulating substrate;
A single heat dissipating pipe disposed on the front side of the heat insulating substrate and through which warm water is passed;
A heat sink that is in contact with the heat radiating pipe and covers the surface of the heat insulating base; and
The said heat radiating pipe is comprised with the double tube | pipe which uses the space | interval of an outer tube and an inner tube as an outward flow path, and uses the inside of an inner tube as a return flow path. The heat radiating pipe is composed of a metal pipe,
The snow melting panel according to claim 1, wherein the snow melting panel is arranged in a serpentine shape in a plan view or a spiral shape in a plan view.   The heat radiating pipe is provided with a double pipe structure connection joint at one end and a double pipe structure straight pipe end corresponding to the connection joint at the other end. The snow melting panel according to claim 1 or 2, characterized by the above.   The heat radiating pipe is provided with a double pipe structure connection joint at one end, and a double pipe structure terminal joint that communicates the forward flow path and the return flow path at the other end. The snow melting panel according to claim 1, wherein the snow melting panel is provided.   5. The snow melting panel according to claim 1, wherein the heat radiating pipe is attached to a back surface of the heat radiating plate by a plurality of pipe support members that are in contact with a lower half portion of the heat radiating pipe. .   The surface of the heat radiating plate is characterized in that at least the plurality of vertical grooves are formed among the plurality of vertical grooves along the water guide gradient of the installation portion and the plurality of horizontal grooves orthogonal to the plurality of vertical grooves. The snow melting panel according to claim 1. A plurality of snow melting panels according to any one of claims 1 to 6;
A hot water source device that circulates and supplies hot water to the plurality of snow melting panels;
While connecting the plurality of snow melting panels and the hot water source device by piping, a hot water supply pipe constituting a hot water circulation channel is provided,
The hot water supply pipe is composed of a double pipe having a gap between the outer pipe and the inner pipe as a main forward flow path and an inside of the inner pipe as a main return flow path, and is connected to the plurality of snow melting panels by piping. A snow melting system characterized by comprising: The plurality of snow melting panels are the snow melting panels according to claim 3,
The plurality of snow melting panels are piped in series,
The hot water supply pipe is a base of a double-pipe structure connecting the hot water source forward pipe and the hot water source return pipe connected to the hot water source device, and the hot water source forward pipe and the hot water source return pipe and the hot water main pipe. A branch joint,
The hot water main pipe is provided with a pipe end joint having a double pipe structure that communicates the main forward flow path and the main return flow path at a pipe end, and the plurality of snow melting panels are interposed. The snow melting system according to claim 7. The plurality of snow melting panels are the snow melting panels according to claim 4,
The hot water supply pipe is a base of a double-pipe structure connecting the hot water source forward pipe and the hot water source return pipe connected to the hot water source device, and the hot water source forward pipe and the hot water source return pipe and the hot water main pipe. A branch joint,
The hot water main pipe is provided with a pipe end joint having a double pipe structure communicating the main forward flow path and the main return flow path at the pipe end, and a double pipe branched to the plurality of snow melting panels. The snow melting system according to claim 7, wherein a plurality of branch joints having a structure are provided. The plurality of snow melting panels are the snow melting panels according to claim 4,
The hot water supply pipe further has a hot water source forward pipe and a hot water source return pipe connected to the hot water source device,
The hot water main pipe is provided with a plurality of branch joints of a double pipe structure branched to the plurality of snow melting panels,
Of the plurality of branch joints, one branch joint disposed at one end of the hot water main pipe is connected to the hot water main forward pipe and has an upstream end of the main flow path in the hot water main pipe and One branch joint that constitutes the upstream end of the main return flow path and is disposed at the other end of the hot water main pipe is connected to the hot water main return pipe and the main forward flow path in the hot water main pipe The snow melting system according to claim 7, wherein a downstream end of the main flow path and a downstream end of the main return channel are configured. The hot water source device includes a hot water heat source unit that generates and supplies hot water, a hot water circulation unit that circulates hot water supplied from the hot water heat source unit in the hot water circulation channel, the hot water heat source unit, and the hot water circulation A control unit for controlling the unit, and a snowfall detection unit for detecting snowfall,
11. The snow melting system according to claim 7, wherein the control unit controls driving of the hot water heat source unit and the hot water circulation unit based on a detection result of the snowfall detection unit. The hot water source device further includes a temperature detection unit that detects an outside air temperature,
The control unit performs an anti-freezing operation to prevent the heat radiating pipe from freezing in a state where the snow detection unit does not detect snow,
In the anti-freezing operation,
When the temperature detection unit detects the first predetermined temperature, only the warm water circulation unit is driven,
The snow melting system according to claim 11, wherein when the temperature detection unit detects a second predetermined temperature lower than the first predetermined temperature, the hot water heat source unit and the hot water circulation unit are driven.

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