JPH0475962B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a snow melting well that can utilize geothermal heat most efficiently.

[Conventional technology]

As a system that uses geothermal heat, there is a system that uses only the thermal energy of groundwater and returns the groundwater itself to the groundwater aquifer.

The feature of this system is that the thermal energy of groundwater is passed through a heat exchanger installed above ground, where it is exchanged with lower temperature water sent through another route, and the heated water is used for snow melting. The groundwater is returned to the ground after heat exchange.

This allows snow melting without changing the absolute amount of groundwater in the groundwater layer.

There are two types of this system: a two-well system that pumps up and returns water using two wells, and a one-well system that uses one well to pump and return water.

[Problem to be solved by the invention]

A feature of the two-well system is that, assuming that the same groundwater layer is used for pumping and water return, it is possible to use heat while maintaining the balance of income and expenditure for each groundwater layer.

However, because the facility is large-scale, the initial cost and running cost are relatively high.

The feature of the single-well system is that although different underground water layers are used for pumping and water return, it is possible to use heat while maintaining the water balance of the entire groundwater, and the facility does not take up a particularly large amount of space. It is cheaper than the two-well method.

On the other hand, however, well construction techniques are required to be sophisticated, and if the strainer for each groundwater layer is not properly cleaned, injection may not be successful.

That is, the underground water heat utilization method of pumping, heat exchange, and reduction has the disadvantages that the initial cost is high as a whole and the facilities are complicated.

Therefore, as one of the heat exchange systems that has recently been considered, research has begun on the so-called underground heat exchange method, which uses the well itself as a heat exchanger.

The basic principle is shown in Figure 1.

Heat supply in this system is subject to two conditions: heat conduction underground and heat transport by underground water flow.

Since these two conditions are largely determined by natural conditions, it is difficult to artificially control the amount of heat pumped.

Therefore, when designing, it is necessary to consider the balance between the amount of heat required to melt snow and the amount of heat that can be supplied.

[Means to solve the problem]

As a result of many years of research, the present inventor has developed a concrete method for underground heat exchange that is suitable for the local groundwater environment, namely:
Invented the structure of a snow-melting well.

The gist of the present invention will be explained with reference to the accompanying drawings.

A well 2 that reaches the groundwater layer 1 is drilled, a return pipe 3 is provided to flow circulating water into the well 2, the return pipe 3 is positioned at the bottom of the well 2, and the lower end opening of the return pipe 3 is directed upward. A spout 4 is provided at the open end facing upward, and a feed pipe 5 is provided in the well 2, and a snow removal device 6 is connected to the end of the feed pipe 5. pipe 5
The lower end opening is arranged in the upper part of the well 2, a pump 7 is provided in the feed pipe 5, and the circulating water introduced into the well 2 through the return pipe 3 is exchanged with groundwater in the well 2, and this heat exchange is performed. This relates to a snow-blowing well characterized in that circulating water warmed by water is fed to a snow-blowing device 6 via a feed pipe 5.

[Effect]

The circulating water is introduced to the bottom of the well 2 through the return pipe 3, and this circulating water is ejected upward from the well 2 through the spout 4, and this ejected circulating water exchanges heat with groundwater and flows through the feed pipe 5. Water is sent to the outside of the well 2 from the lower end by a pump 7 and used by the snow removal device 6.

At this time, since there is a spout 4 and a pump 7 that sucks water from the groundwater layer 1, convection occurs as shown by the arrow in Figure 2, and the circulating water and groundwater are well stirred and mixed, so that the above-mentioned heat is generated. The exchange rate will be higher.

〔Example〕

In FIG. 2, the end of the return pipe 3 is directed upward,
A spout 4 (jet nozzle) is provided at the tip to generate convection as shown by → inside the groundwater layer 1 and to perform heat exchange well.

It should be noted that the use of a submersible pump for the pump 7 shown in FIG. 2 performs more efficient heat exchange.

In this case, the submersible pump not only pumps up the groundwater in the well 2, but also sucks in the groundwater around the outer periphery of the well 2, and in order to improve the flow of the groundwater, the warmer groundwater can be sent to the surface.

3 and 4 illustrate the snow removal device 6 connected to this embodiment, and FIG.
The figure shows a non-sprinkling type snow melting device 6.

When a non-sprinkling type snow removal device like the one shown in Figure 4 is adopted, the circulating water does not come into contact with the atmosphere and uses only the heat of the circulating water, that is, underground heat, so the circulating water does not become contaminated. Therefore, there is no clogging in the well 2, and it is the same as using geothermal heat (groundwater heat) in its natural state.
A very convenient snow-melting well that does not require any cleaning or the like inside the well 2 can be obtained.

In the figure, reference numeral 8 indicates a water nozzle, 9 indicates a road gutter, 10 indicates a snow-melting floor plate, and 11 indicates a circulating water passage.

〔Effect of the invention〕

Since the present invention is configured as described above, it is possible to obtain a snow melting well with very good heat exchange efficiency that does not waste geothermal heat (groundwater heat).

Further, the present invention provides a snow melting well that exhibits excellent effects such as the heat exchange structure itself being very simple and being able to be manufactured at low cost.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; FIG. 1 is a schematic explanatory diagram of the present invention, FIG. 2 is an explanatory sectional view showing one embodiment, and FIGS. 3 and 4 are embodiments of a snow removal device. be. 1... Groundwater aquifer, 2... Well, 3... Return pipe, 4... Spout, 5... Feeding pipe, 6... Snow removal device, 7... Pump.

Claims (1)

[Claims] 1 Drill well 2 that reaches underground water layer 1, and
A return pipe 3 is provided through which circulating water flows into the well 2, and this return pipe 3 is located at the bottom of the well 2, with the lower end opening of the return pipe 3 facing upward; A spout 4 is provided, while
A feed pipe 5 is provided in the well 2, and this feed pipe 5
A snow removal device 6 is connected to the end of the snow melting device 6, and the lower end opening of the feed pipe 5 is arranged in the upper part of the well 2. A snow-blowing well characterized in that circulating water is subjected to heat exchange with groundwater in the well 2, and the circulating water warmed by this heat exchange is sent to a snow-blowing device 6 via a feed pipe 5.