JPH01247601A - Water unsprinkling type snow melting method utilizing geothermal effect in the depth of ground - Google Patents

Abstract

PURPOSE:To melt the snow on a road surface and prevent the freezing of the road surface by connecting a heat exchanger installed in the deep part of a well and a heat radiation pipe buried in the road surface on the ground through a pipe and allowing thermal transport medium to circulate. CONSTITUTION:A heat exchanger 2 such as heat pipe installed at the deep part of a well 1 and a pipe 6 for heat radiation and collection which is installed in meandering form in a road surface 5 on the ground are connected through a thermal medium transporting pipe 3 and a thermal medium circulation pump 4. Through the circulation of the thermal medium in the system, the snow on the ground surface can be melted, without pumping up the underground water and spraying said water onto the road. Therefore, freezing can be prevented.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a waterless snow melting method that utilizes the heating effect of geothermal heat deep underground, and particularly relates to a waterless snow melting method that utilizes the heating effect of geothermal heat deep underground. This relates to an undefeated water lightning extinguishing method that takes out and uses water to melt snow that falls on roads and buildings in the winter, and heats up and retains the cold energy after heat utilization using geothermal heat deep underground.

[Conventional technology]

In recent years, the method of extinguishing lightning that has fallen on roads and buildings in snowy, cold regions by sprinkling groundwater has become widespread.
In this type of water-sprinkling lightning suppression method, the sprinkled groundwater melts the snow, but on the other hand, water that flows down from roads and buildings into gutters directly flows into rivers and eventually flows into the ocean.
Social problems such as depletion of regional groundwater resources and poor soil quality are becoming increasingly serious.

Various proposals have been made for this purpose, but in the method and device for heating road snow melting water by utilizing heat from groundwater, disclosed in Japanese Patent Application Laid-open No. 49-59429, It consists of two wells that have been dug up to 300 degrees, a groundwater pump, a river water intake pump, a heat exchanger, a snow melting pipe, and a snow melting nozzle. Lake or river water, which is about 1°C, is slightly warmed to about 7 to 8°C through a snow melting nozzle, and then water is sprinkled through a snow melting nozzle to melt the snow.

In addition, the road disclosed in Utility Model Publication No. 45-25945 is
A carbonaceous material is mixed into the concrete 1 or asphalt layer that makes up one part of the road covering of expressways in cold regions to give it thermal conductivity, and underground water flow passages buried within the road surface are provided. The system has a drainage outlet located outside the road. Groundwater near the surface is pumped up, and the groundwater, which remains at a temperature of approximately 10°C throughout the summer and winter, is used as a heat source to melt snow, and the water is then drained into the river. be.

[Problem to be solved by the invention]

However, all of the conventional techniques have had many problems.

That is, in the method disclosed in JP-A-49-59429, river water at about 1°C is simply heated to about 7 to 8°C via a heat exchanger using groundwater at about 14°C as a heat source. Thermal efficiency is poor and the snow melting effect cannot be expected.Furthermore, since water is sprayed from snow melting nozzles, it is impossible to spray water uniformly due to the road structure, so most of the snow on the road remains unmelted, and the sprinkled water freezes. It is rather dangerous for motor vehicles and pedestrians to walk.

In addition, the purpose of use is to sprinkle water on roads to melt snow, and since the river water is heated with groundwater at about 14 degrees Celsius, the river water in the heat exchanger does not rise to the groundwater temperature, and the water temperature is lower than the groundwater temperature. Because the water is lower in the area, large amounts of groundwater and river water are required for lightning suppression purposes, and with this method, pedestrians are splashed with water from tires while cars are running, and private homes along the railway line are constantly flooded. This is a problem in areas with heavy snowfall, where the water freezes and causes damage such as doors not being able to open.

On the other hand, the method disclosed in the above-mentioned Japanese Utility Model Publication No. 45-25945 melts snow using groundwater near the surface of the earth and disposes the wastewater into a river from a drainage outlet outside the road, which leads to depletion of groundwater resources. It has the disadvantage of causing ground subsidence, which is a social problem.

Furthermore, since it uses groundwater near the surface of the earth at a temperature of about 10°C, it has a low snow melting effect and has the disadvantage of requiring a large amount of groundwater.

In view of the above-mentioned circumstances, the present invention was made to facilitate economic and social activities during the winter in areas with heavy snowfall, and utilizes geothermal heat from deep underground in the winter using a heat exchanger.

The snow that falls on it is melted by passing it through heat collection and radiation pipes buried in roads and buildings, and then the cold heat is raised to geothermal temperature by utilizing the heating and insulation effects of the geothermal heat deep underground. It is an object of the present invention to provide an undefeated water lightning extinguishing method that warms and retains heat. 6 [Means for Solving the Problems] In order to achieve the above object, the present invention provides a heat exchange method in a well drilled deep underground. Geothermal heat is collected during the winter by a container and sent as a heat transport medium into heat dissipation pipes buried in roads or buildings, and the heat dissipated from the geothermal heat melts snow falling on roads or buildings and also prevents freezing. After the measurement, the cooled heat transport medium is returned and circulated to a heat exchanger installed deep underground, and the geothermal heat in the deep underground of the well is utilized to increase the temperature and retain the heat. The feature is that the low-temperature area, which has been lowered by geothermal heat, is heated up to room temperature and kept warm.

[Effect]

Next, the operation of the present invention will be explained.

The waterless snow removal method according to the present invention collects heat from geothermal heat deep underground in a well through a heat exchanger in winter, and circulates a heat transport medium in a heat dissipation pipe buried in a road surface or a building. The geothermal heat mentioned above melts snow and also prevents freezing.
As a result, the heat medium that has been radiated and cooled is returned to the heat exchanger deep underground in the well, and the low temperature area generated around the heat exchanger is utilized to raise the temperature and retain heat of the geothermal heat deep underground. The heat is gradually raised to normal geothermal temperature and kept in the geothermal zone until the following winter in preparation for reuse in the geothermal zone deep underground.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIGS. 1 and 2 show an embodiment in which the waterless snow removal method of the present invention is applied to a road surface.

As shown in the figure, in order to carry out the undefeated water lightning extinguishing method of the present invention, a well 1 is drilled deep underground, and a heat exchanger 2 and a heat medium transport pipe 3 are installed deep underground in the well. A vibro for heat radiation and heat collection is buried in the medium circulation pump 4 and the road surface 5 in a meandering shape, or in an appropriate shape such as a spiral shape or a zigzag shape.

In theory, pipes can be installed not only on road surfaces but also in buildings, bridges, and other locations where lightning should be extinguished. The pipes buried in a suitable shape on the road surface enter the well via a circulation pump and are connected to a heat exchanger deep underground.

Therefore, in the embodiment of the present invention configured as described above, geothermal heat can be pumped up from the geothermal region 7 deep underground of the well in winter by using the heat exchanger and the circulation pump by combining the well, the heat exchanger, and the buried pipe. For example, geothermal heat can be harvested due to the heating and heat retention effects of geothermal areas deep underground, and this geothermal heat can be transferred to heat collecting and dissipating pipes buried under the road surface during the winter at a rate of 0.3 meters per second or more using a heat medium. 1
．． If sent at a speed of 5 meters, geothermal heat will be transmitted to the road surface, melting snow falling on the road surface or buildings one after another, and also preventing freezing, effectively extinguishing the snow falling on the road surface or buildings. It can be thunder.

In this way, after lightning has been extinguished and anti-freezing, the low-temperature heat medium is sent by a circulation pump to a heat exchanger installed deep underground within the well. After the lightning is extinguished, the heat medium returned to the heat exchanger receives heat from the geothermal region deep underground, and its temperature rises again, gradually creating a low temperature region within the geothermal region. However, over time, this low-temperature region receives heat from deep underground and gradually rises in temperature until it reaches the normal geothermal temperature and is kept warm by the room-temperature geothermal heat deep underground until it is used the next winter. .

Note that it is also possible to use a heat pipe as a heat exchanger, and at least one of the heat transport pipes has an insulated structure. It is also possible to collect it and maintain it as a high-temperature area underground, which will further enhance the effects of lightning extinguishing and freezing prevention in winter.

Therefore, according to this embodiment, after melting the snow falling on the road surface or building and preventing freezing, the cooled heat medium is returned to the geothermal region deep underground, resulting in a cold region. Because it receives geothermal heat from the surrounding deep underground and gradually warms up to the normal temperature of the geothermal zone in preparation for use in the next winter, it requires less circulation than conventional water-sprinkling lightning suppression methods. It exhibits a great lightning extinguishing effect, and a good lightning extinguishing effect can be obtained.

〔Effect of the invention〕

As mentioned above, according to the waterless snow-melting method of the present invention that utilizes the heating effect of geothermal heat deep underground, the snow that falls on roads or buildings is melted and prevented from freezing, and then the heat is radiated. The low-temperature region created by returning the cooled heat medium to the geothermal zone deep underground receives geothermal heat from the surrounding deep underground and gradually warms up to geothermal temperature, preparing it for use in the next winter. Because it is a water-sprinkled lightning-extinguishing method, it exhibits a great lightning-extinguishing effect with a much smaller circulation volume than conventional water-sprinkled lightning-extinguishing methods, and a good lightning extinguishing effect can be obtained.

In addition, without sprinkling groundwater on roads or buildings or exposing it to the outside air, the heat carrier after lightning is extinguished is returned to deep underground through wells, thereby transferring the low-temperature region that has formed in the geothermal zone to the surrounding geothermal zone. Since the temperature is raised and kept warm, there is no contamination of the underground geothermal zone.

Furthermore, according to the waterless snow removal method of the present invention, lightning can be easily extinguished during the winter months in areas with heavy snowfall without causing social problems such as depletion of underground resources or ground subsidence, thereby facilitating economic and social activities. The effects that can be achieved are great.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of the waterless snow removal method of the present invention, and FIG. 2 is a cross-sectional explanatory view of FIG. 1. 1...well, 2...heat exchanger, 3...
・Pipe for transporting heat medium, 4...Pump for heat medium circulation, 5...Road surface, 6...Radiation pipe, 7
...Geothermal area, 8...Groundwater table.

Claims (4)

[Claims] (1) A heat exchanger is provided in a well deep underground, the heat exchanger and the above-ground heat utilization area are connected through two pipes, and a heat transport medium is circulated through the pipes. A waterless snow removal method that uses geothermal energy deep underground. (2) In winter, geothermal heat is collected using a heat exchanger deep underground.
A heat transport medium is sent to heat dissipation pipes buried in the road surface above ground, melting the snow that falls on the road surface and also preventing the road surface from freezing. A non-sprinkling snow melting method that utilizes the heating effect of geothermal heat deep underground. (3) The underground according to claim 1 or 2, characterized in that the low-temperature area, which has been deprived of geothermal heat deep underground and whose temperature has decreased, is kept warm by being heated to the normal temperature of the geothermal heat by the heating effect of surrounding geothermal heat. A waterless snow removal method that utilizes the heating effect of deep geothermal heat. (4) Heat exchangers and heat radiation pipes buried in the road surface are filled with antifreeze as a heat transport medium, and a pump for circulating the antifreeze is used to pump up geothermal heat to melt snow falling on the road surface. 4. The waterless snow melting method using the heating effect of geothermal heat deep underground as claimed in any one of claims 1 to 3, which also prevents freezing.