Underground heat melting snow system

Abstract

Provided is a ground heat snow melting system that can be used with low cost and high energy efficiency by inducing the ground heat in the buried pipe and blowing it onto the roof to melt the snow. 【Solution means】The ground heat snow melting system 1 of the present invention includes a downspout 10 having an upper end connected to the roof A1 of the structure A and a lower end connected to the buried pipe B, a first guiding means 21 disposed near the buried pipe B of the downspout 10, and a second guiding means 22 disposed above the first guiding means 21 of the downspout 10. By heating the first guiding means 21, the warm air in the buried pipe B is induced into the downspout 10, and by heating the second guiding means 22, the warm air in the downspout 10 is pushed up and configured to be blown out toward the roof A1 of the structure A.

Description

Technical Field

[0001] The present invention relates to a ground heat snow melting system, and particularly to a ground heat snow melting system that can be used at low cost and with high energy efficiency by guiding the ground heat in the buried pipe and blowing it onto the roof to melt the snow.

Background Art

[0002] Steel frame (S-type) large structures such as logistics warehouses and factories have a large area on the roof. Especially in cold regions such as Hokkaido and Tohoku regions, a large snow load is applied to the roof due to snow accumulation, so effective snow countermeasures are required. As a snow countermeasure in cold regions, a non-snowfall structure in which the roof of the structure is inclined in a valley shape toward the center and a drainage groove is provided in the center has become widespread. In the non-snowfall structure, the snow accumulated on the roof is collected in the center of the structure, gradually melted at the internal temperature of the structure, and the melted snow water is discharged from the drainage groove to prevent snowfall from the roof. In addition, for structures with a snowfall structure, a technology for melting the snow accumulated on the roof with a snow melting device has been developed. Patent Documents 1 and 2 disclose a snow melting device in which a heater is attached to a folded plate roof to melt the snow in a structure with a snowfall structure.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] The prior art has the following problems. <1>Since the non-snowfall structure allows the snow to overwinter on the roof, it is necessary to lay a waterproof sheet on the folded plate roof. The cost of sheet laying is 30,000 to 50,000 yen / m 2It is costly, for example, in the case of an S-shaped structure of 5000 m scale, in addition to the main body work, an additional cost of over 150 million yen is required. Also, regular maintenance and repair and replacement of the waterproof sheet occur, and the maintenance and management costs also increase. 2 <2>The non-snowfall structure must ensure a design strength that can withstand the snow load in order to overwinter while supporting a snow load of several hundred kg per meter. For this reason, the construction cost increases. 3 <3>The snow melting devices of Patent Documents 1 and 2 have a structure in which heaters are attached to the entire roof, so it is difficult to retrofit existing structures, and the installation cost is high. Also, since it is a structure that melts snow by heating a large area on the roof, the energy efficiency is poor and the usage cost increases. <4>In the snow melting devices of Patent Documents 1 and 2, the melted snow water on the roof flows down to the eaves, and the wind containing snow passes over it and is drawn under the eaves, so snow drifts and icicles are likely to be formed at the eaves (Fig. 6). When snow drifts or the like occur, there is a risk of inducing water leakage into the room by breaking the sealing material on the roof due to the melted snow water being blocked at the eaves and repeating freezing and melting.

[0005] An object of the present invention is to provide a ground heat snow melting system for solving the above problems.

Means for Solving the Problems

[0006] The ground heat snow melting system of the present invention includes a vertical downspout having an upper end connected to the roof of a structure and a lower end connected to a buried pipe, a first guiding means disposed near the buried pipe of the vertical downspout, and a second guiding means disposed above the first guiding means of the vertical downspout. By heating the first guiding means, warm air in the buried pipe is induced into the vertical downspout, and by heating the second guiding means, the warm air in the vertical downspout is pushed up and configured to blow out toward the roof of the structure.

[0007] In the ground heat snow melting system of the present invention, the first guiding means and the second guiding means may be long heating devices extending in the height direction within the vertical downspout.

[0008] In the ground heat snow melting system of the present invention, the heating temperature of the first guiding means may be lower than the heating temperature of the second guiding means.

[0009] The ground heat snow melting system of the present invention may include a downspout having a pipe body and an injection duct connected to the upper end of the pipe body, and the injection duct may include an eaves gutter arranged along the eaves of the roof of the structure, a duct cover covering the upper part of the eaves gutter, and a slit opening from between the eaves gutter and the duct cover toward the roof side of the structure.

[0010] The ground heat snow melting system of the present invention includes a detection means, a first guiding means, a second guiding means, and a control means electrically connected to the detection means. The detection means detects at least one index of the outside air temperature, outside humidity, outside air pressure, the temperature inside the downspout, the humidity inside the downspout, the air pressure inside the downspout, the temperature inside the buried pipe, the humidity inside the buried pipe, and the air pressure inside the buried pipe, and the control means controls the heating temperature of the first guiding means and the second guiding means based on the index detected by the detection means.

[0011] The ground heat snow melting system of the present invention includes a detection means and a recording means electrically connected to the detection means. The detection means detects at least one index of the outside air temperature, outside humidity, outside air pressure, the temperature inside the downspout, the humidity inside the downspout, the air pressure inside the downspout, the temperature inside the buried pipe, the humidity inside the buried pipe, and the air pressure inside the buried pipe, and the recording means records the index detected by the detection means.

Advantages of the Invention

[0012] Since the ground heat snow melting system of the present invention has the above configuration, it has at least one of the following effects. <1> It is a structure that melts snow using the ground heat in the buried pipe, and since the heating device is only used as a means for guiding the ground heat, the energy efficiency is extremely high compared to the conventional technology that directly melts snow with a heater. Therefore, the utilization cost is low and the CO2 reduction effect is high. <2> It can be installed simply by attaching it to the eaves of the roof and does not need to be incorporated into the design of the structure, so the installation cost is low. In addition, it can be retrofitted to existing structures or easily expanded. <3>Since it is a structure that constantly blows warm air from the eaves towards the roof while collecting the melted snow water into the downspout, it can prevent the occurrence of snowdrifts and icicles, and prevent the leakage of sugary substances due to the retention of melted snow water.

Brief Description of the Drawings

[0013]

Figure 1

Figure 2

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Figure 5

Figure 6

Modes for Carrying Out the Invention

[0014] Hereinafter, the present invention will be described in detail with reference to the drawings. In the present invention, "warm air" is used to mean air that is relatively higher in temperature compared to the outside air or the air inside the pipe. Therefore, for example, even if the air is about 5°C, it will be "warm air" if its temperature is higher than the outside air.

Examples

[0015] <1>Ground-source heat snow melting system (Figs. 1, 2) The ground-source heat snow melting system 1 is a system that uses ground-source heat to melt the snow accumulated on the roof A1. The ground-source heat snow melting system 1 includes at least a downspout 10 extending in the height direction of the structure A and a guiding means 20 disposed in the downspout 10. In this example, it further includes a detection means 30, a control means 40 electrically connected to the guiding means 20 and the detection means 30, and a recording means 50 electrically connected to the detection means 30. The ground-source heat snow melting system 1 can be implemented, for example, with the following configuration. The downspout 10 is arranged along the outer wall of the structure A. Connect the upper part of the vertical pipe 10 to the roof A1 and the lower part to the buried pipe B in the ground. Arrange the control box 40a on the outer wall of the structure A. Store the control means 40 and the recording means 50 in the control box 40a. The control means 40 is electrically connected to an external power source and communication network. Note that when the detection means 30 itself has a recording function, the detection means 30 may be directly connected to the external network without passing through the recording means 50. Arrange the outside air sensor 32 of the detection means 30 on the outer wall near the control box 40a and electrically connect it to the control means 40 and the recording means 50. Arrange the guiding means 20 in the vertical pipe 10, lead out the power cable of the guiding means 20 outside the pipe of the vertical pipe 10, draw it into the control box 40a, and electrically connect it to the control means 40. Arrange the in-pipe sensor 31 of the detection means 30 in the vertical pipe 10, lead out the communication cable outside the pipe of the vertical pipe 10, draw it into the control box 40a, and electrically connect it to the control means 40 and the recording means 50. The ground heat snow melting system 1 has one feature in the configuration that the warm air in the buried pipe B can be guided into the vertical pipe 10 and accelerated to be sprayed onto the roof A1 by the combination of two guiding means 20.

[0016] <1.1>Structure (Figure 2) The ground heat snow melting system 1 can be installed on the structure A with a snowfall structure. In this example, an example where the structure A is an S-shaped warehouse with a folded plate roof will be described. However, the structure A is not limited to the above. For example, the structure of the structure A may not be S-shaped but RC-shaped. Also, the use of the structure A is not limited to a warehouse and may be a factory, office, etc. Furthermore, the roof of the structure A is not limited to a folded plate roof and may be a corrugated slate roof or a tile bar roof.

[0017] <1.2>Buried pipe (Figure 2) The ground heat snow melting system 1 is connected to the buried pipe B buried in the ground. The buried pipe B extends horizontally with a predetermined gradient deeper than the freezing depth in the ground near the structure A and is connected to the lower part of the vertical pipe 10. In this example, an example where the buried pipe B is a rainwater pipe made of reinforced concrete will be described. However, the buried pipe B is not limited to the above, and the application may be a sewer pipe or the like, and the material may be a rigid vinyl chloride pipe or the like. Since the buried pipe B is hardly affected by the temperature change on the ground surface, it is maintained in a certain temperature range (subsurface heat) according to the depth, and the inside of the buried pipe B is filled with warm air due to the subsurface heat.

[0018] <1.3>Cold draft (Figure 3) Since the warm air in the buried pipe has a low density and is light, it tries to enter the vertical pipe connected to the upper part. However, in the prior art without the guiding means 20, the outside cold air is pushed into the pipe from the upper part of the vertical pipe to the lower part as a cold draft (humid and high-density cold air), so that the warm air in the buried pipe cannot enter the vertical pipe. Therefore, in the prior art, the warm air due to the subsurface heat cannot be used for snow melting.

[0019] <2>Vertical pipe (Figure 1) The vertical pipe 10 is a member having both a warm air transportation function and a snowmelt water discharge function. The vertical pipe 10 extends in the vertical direction along the outer wall of the structure A and connects the roof A1 and the buried pipe B. Specifically, the vertical pipe 10 includes a pipe body 11, an inlet 12 located at the lower end of the pipe body 11, an outlet 13 located at the upper end of the pipe body 11, an injection duct 14 connecting the outlet 13 and the roof A1, and a communication part 15 provided in the middle of the pipe body 11. The inlet 12 is connected to the upper part of the buried pipe B in the ground. The communication part 15 is a part for passing the power cable of the guiding means 20 inside the pipe of the pipe body 11 to the outside of the pipe. The communication part 15 includes a plurality of communication holes 15a that communicate the inside and outside of the pipe body 11. In this example, three communication holes 15a are arranged along the height direction of the pipe body 11.

[0020] <2.1>Injection duct (Figure 1) The injection duct 14 is a member for blowing warm air onto the roof A1. The injection duct 14 includes a long eaves gutter 14a, a long duct cover 14b, and a slit 14c provided between the eaves gutter 14a and the duct cover 14b. Specifically, the eaves gutter 14a is arranged along the eaves tip of the roof A1, and the discharge port 13 of the pipe body 11 is connected to the lower part of the eaves gutter 14a. The upper part of the eaves gutter 14a is covered with the duct cover 14b over the entire length. A slit 14c is formed by providing a gap between the side of the duct cover 14b and the side of the eaves gutter 14a on the side of the roof A1 of the eaves gutter 14a. By providing the injection duct 14 above the upper part of the vertical gutter 10, the warm air in the pipe body 11 can be injected toward the roof A1, and the snow accumulated on the roof A1 can be efficiently melted. Also, by selecting the height and direction of the slit 14c, the injection amount and injection direction of the warm air can be arbitrarily set.

[0021] <3>Induction means (Fig. 1) The induction means 20 is a means for inducing the warm air in the buried pipe B to the roof A1 by heat generation. The induction means 20 includes at least a first induction means 21 arranged near the buried pipe B in the pipe body 11 and a second induction means 22 arranged above the first induction means 21 in the pipe body 11. The first induction means 21 and the second induction means 22 can be mounted, for example, as line heaters attached along the longitudinal direction in the pipe body 11. Specifically, the line heater of the first induction means 21 is attached from the communication part 15 of the pipe body 11 downward inside the pipe to reach the inside of the buried pipe B from the inlet 12. The line heater of the second induction means 22 is attached from the communication part 15 of the pipe body 11 upward inside the pipe to reach near the discharge port 13. Since the line heater can set the heating temperature by length, the design is easy and it is particularly suitable as the induction means 20. The power cables of the first induction means 21 and the second induction means 22 are respectively drawn out of the pipe through the communication holes 15a and drawn into the control box 40a on the outer wall of the structure A. However, the induction means 20 is not limited to the above, and for example, it may be a spot type or a winding type instead of a line heater. Also, it may be a hot water type instead of an electric heating type, or it may have a structure in which it is attached outside the pipe and heats through the pipe wall instead of inside the pipe.

[0022] <3.1>Heating temperature The first induction means 21 and the second induction means 22 can be heated at a predetermined set temperature. The heating temperature of the induction means 20 is set so that the spraying temperature onto the roof A1 by the injection duct 14 becomes a positive temperature. The first temperature T 1 only needs to be able to induce relatively high-temperature warm air into the pipe body 11 by geothermal heat, so the first temperature T for pushing the cold draft in the pipe body 11 up to the discharge port 13 2 can be set to a relatively lower temperature compared to. Therefore, in this example, the first temperature T, which is the heating temperature of the first induction means 1 is set lower than the second temperature T, which is the heating temperature of the second induction means. Specifically, for example, the first temperature T 2 is set to 30 °C, and the second temperature T 1 is set to 35 °C. 2 In the case of this example, by keeping the first temperature T 1 lower than the second temperature T 2 the power consumption of the induction means 20 can be reduced, and the energy efficiency can be further improved.

[0023] <4>Detection means (Figure 1) The detection means 30 is a means for detecting the temperature etc. inside the downpipe 10. The detection means 30 includes an in-pipe sensor 31 disposed inside the downpipe 10 and an outside-air sensor 32 disposed outside the downpipe 10. The in-pipe sensor 31 and the outside-air sensor 32 can be mounted, for example, as a thermistor with waterproof processing. In addition, for example, a thermocouple, a resistance temperature detector, an optical fiber sensor, etc. may be adopted. The in-pipe sensor 31 detects the air temperature inside the downpipe 10 or the air temperature inside the buried pipe B according to its installation location. The outside-air sensor 32 detects the outside air temperature. However, the in-pipe sensor 31 and the outside air sensor 32 are not limited to temperature sensors, and may have functions of a humidity sensor or a pressure sensor. In this case, the in-pipe sensor 31 and the outside air sensor 32 can detect outside humidity, humidity inside the vertical drain 10, humidity inside the buried pipe B, outside air pressure, air pressure inside the vertical drain 10, air pressure inside the buried pipe B, etc., according to their installation locations. Also, a small data logger may be incorporated into the detection means 30 so that the detection means 30 itself records data.

[0024] <5> Control means (Fig. 1) The control means 40 is means for controlling the guiding means 20. The control means 40 can be implemented as a combination of a control board equipped with, for example, a microcomputer, a relay, a capacitor, etc. and a control program. The control means 40 is electrically connected to the guiding means 20 and the detection means 30. In this example, the control means 40 acquires indicators such as the outside air temperature and the temperature inside the vertical drain 10 from the detection means 30, and controls the heating temperatures of the first guiding means 21 and the second guiding means 22 based on the indicators. Details of the control will be described later.

[0025] <6> Recording means (Fig. 1) The recording means 50 is means for recording data related to the ground heat snow melting system 1. The recording means 50 can be implemented as a data logger that collects and stores indicators such as the outside air temperature. The recording means 50 is electrically connected to the detection means 30, and acquires indicators such as the outside air temperature, outside humidity, outside air pressure, air temperature inside the vertical drain 10, humidity inside the vertical drain 10, air pressure inside the vertical drain 10, air temperature inside the buried pipe B, humidity inside the buried pipe B, and air pressure inside the buried pipe B detected by the detection means 30 at regular time intervals, and stores them in the internal memory. The stored indicators can be transmitted to a remote administrator via a communication network and used for performance evaluation and maintenance of the ground heat snow melting system 1.

[0026] <7> Snow melting function of the ground heat snow melting system The ground heat snow melting system 1 functions as follows. When the first guiding means 21 is heated, the air temperature near the inlet 12 of the pipe body 11 rises, pushing up the cold draft inside the pipe body 11. As a result, an induction port for the warm air in the buried pipe B is secured below inside the pipe body 11, and the warm air in the buried pipe B enters the pipe body 11 as an air current (Fig. 4). The warm air that has entered the pipe body 11 from the buried pipe B is cooled by the outside air through the pipe wall as it rises inside the pipe, and its rising speed gradually decreases. However, when the second guiding means 22 provided in the middle part of the pipe body 11 is heated, the temperature of the warm air rises again, and it rises inside the pipe while accelerating. The warm air that has accelerated inside the pipe body 11 pushes up the cold draft and sprays out from the discharge port 13. As a result, a passage for the warm air that continues from the buried pipe B to the discharge port 13 is secured inside the pipe body 11. The warm air that has exited from the discharge port 13 fills the injection duct 14 and is pressurized, and then sprays out from the slit 14c toward the roof A1 (Fig. 5). As a result, the snow accumulation on the roof A1 is heated and melted from the eaves side, preventing the occurrence of snow guards and icicles at the eaves. The snowmelt water due to heating flows into the injection duct 14 along the gradient of the roof A1, and is discharged into the buried pipe B through the pipe body 11. In the prior art, if the snowmelt water adheres to the inside of the pipe, there is a risk of freezing and blocking due to the outside air. However, in the present invention, since warm air always flows inside the pipe, there is no risk of freezing.

[0027] <8> Control of Heating Temperature In this example, the control means 40 controls the heating temperature of the guiding means 20. Specifically, for example, it is controlled as follows.

[0028] <8.1> Control by Air Temperature When the air temperature inside the buried pipe B or the pipe body 11 is relatively low, it becomes difficult to push up the cold draft inside the pipe body 11. Therefore, it is effective to set the heating temperature of the first guiding means 21 relatively high. Also, when the outside air temperature is relatively low, since the rising speed of the warm air inside the pipe body 11 decreases, it is effective to set the heating temperature of the second guiding means 22 relatively high. As described above, the control means 40 can control the first guiding means 21 and the second guiding means 22 such that the heating temperature increases as the air temperature detected by the in-duct sensor 31 decreases.

[0029] <8.2> Control by Atmospheric Pressure and Humidity When the atmospheric pressure and humidity inside the buried pipe B or the pipe body 11 are relatively high, the upward speed of the warm air is slower than when the atmospheric pressure and humidity are low. Therefore, it is effective to set the heating temperature of the first guiding means 21 relatively high. As described above, the control means 40 can control the first guiding means 21 and the second guiding means 22 based on the atmospheric pressure and humidity detected by the in-duct sensor 31 such that the heating temperature increases as the atmospheric pressure and humidity increase.

Explanation of Reference Numerals

[0030] 1 Ground-source heat snow melting system 10 Vertical drain 11 Pipe body 12 Inlet 13 Outlet 14 Injection duct 14a Eaves drain 14b Duct cover 14c Slit 15 Communication part 15a Communication hole 20 Guiding means 21 First guiding means 22 Second guiding means 30 Detection means 31 In-duct sensor 32 Outdoor air sensor 40 Control means 40a Control box 50 Recording means A Structure A1 Roof B Buried pipe T1 First temperature T2 Second temperature

Claims

1. A geothermal snow melting system that uses warm air in buried pipes generated by geothermal heat to melt snow on the roof of a structure, A downspout having an upper end connected to the roof of the structure and a lower end connected to the buried pipe; A first guide means is disposed in the vicinity of the buried pipe of the downspout; a second guide means separate from the first guide means and disposed above the first guide means of the downspout; The first inducing means and the second inducing means are individually controllable; The first induction means heats the buried pipe, and induces the warm air into the downpipe. The second induction means is configured to push up the warm air in the downpipe and blow it out toward the roof of the structure. Geothermal snow melting system.

2. The first induction means and the second induction means are elongated heating devices extending in the height direction of the downpipe. The geothermal snow melting system according to claim 1 .

3. The heating temperature of the first induction means is lower than the heating temperature of the second induction means. The geothermal snow melting system according to claim 1 .

4. The downspout comprises a pipe body and an injection duct connected to an upper end of the pipe body; The injection duct is characterized in that it comprises an eaves gutter arranged along the eaves edge of the roof of the structure, a duct cover covering an upper part of the eaves gutter, and a slit opening toward the roof side of the structure from between the eaves gutter and the duct cover. The geothermal snow melting system according to claim 1 .

5. A detection means; a control means electrically connected to the first inducing means, the second inducing means, and the detecting means; The detection means detects at least one of the following indicators: outside air temperature, outside humidity, outside air pressure, air temperature inside the downpipe, humidity inside the downpipe, air pressure inside the downpipe, air temperature inside the buried pipe, humidity inside the buried pipe, and air pressure inside the buried pipe; The control means controls the heating temperatures of the first induction means and the second induction means based on the index detected by the detection means. A geothermal snow melting system according to any one of claims 1 to 4.

6. A detection means; a recording means electrically connected to the detection means; The detection means detects at least one of the following indicators: outside air temperature, outside humidity, outside air pressure, air temperature inside the downpipe, humidity inside the downpipe, air pressure inside the downpipe, air temperature inside the buried pipe, humidity inside the buried pipe, and air pressure inside the buried pipe; The recording means records the indicator detected by the detection means. A geothermal snow melting system according to any one of claims 1 to 4.

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