JPS6029871B2 - Groundwater restoration method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in the case where groundwater is recycled and used for heating greenhouses, such as agricultural or domestic greenhouses, or for other heating and cooling purposes.

The present inventor used a heat pump to exchange heat between groundwater pumped above the ground and water circulating through heat radiation pipes installed in a greenhouse, thereby flooding the circulating water and turning it into hot water. The greenhouse is heated by the heat radiated as it passes through the heat radiating pipes inside the greenhouse, and the groundwater that has undergone heat exchange with the heat pump is returned to the ground at a surface location away from the pumping point. The heating method and device, and the above-mentioned groundwater recirculation method include, for example, pumping up groundwater in a dual structure inside and outside so that the groundwater pumping point and the groundwater return point are at the same ground surface location but at different positions in the depth direction. A method of utilizing heat from underground water using a return pipe has been developed, and the present invention is a further improvement on this method.

As mentioned above, when returning groundwater to the ground after heat use, it is necessary to drive a return pipe into the specified groundwater layer and apply head pressure (water column pressure) to it to forcibly return the groundwater.
Therefore, the idea is to make the groundwater circulation system from the pumping pipe to the return pipe a closed system, extend the upper part of the return pipe above the ground, and apply a constant water column pressure at this extension to smoothly return the groundwater to the ground. It will be done.

When attempting to apply the desired groundwater inflow pressure at the upper extension of the return pipes, their height can be considerable, thus creating difficulties in their installation within greenhouses and their associated spaces. That is inevitable.

Moreover, since the above-mentioned groundwater return system is a closed system, when groundwater is forcibly returned underground as described above, the inside of the return system becomes negative pressure, and water flows back in the heat pump and its attached equipment. I also have something like that.

The present invention was made to solve these problems, and after the groundwater pumped above the ground is subjected to heat exchange using a heat pump, the heat-exchanged groundwater is pumped to a location on the ground surface away from the pumping location. In the heat utilization of groundwater, the water is returned to the ground through a heat pump, or is returned to the ground at the same surface location as the above-mentioned pumping point, but at a distance in the depth direction. The intended purpose was achieved by making the underground water return system a closed system until it returns to the ground, and by removing air from the underground water return system from the groundwater exiting the heat pump to returning underground. It is.

The present invention will be explained below with reference to embodiments shown in the drawings.

Example 1 As shown in Fig. 1, heat dissipation pipes 2 made of fin pipes (pipe with many circular heat dissipation fins attached at close intervals on the circumference) are arranged in a meandering manner on the floor of a greenhouse, and these heat dissipation The inlet/outlet of the pipe 2 is connected to the heat radiation side (Freon compression condensation part) of the heat pump 3 installed outside the greenhouse, and a circulation system for greenhouse heating water is established between the heat radiation side of the heat pump 3 and the heat radiation pipe 2 inside the greenhouse. It forms road 1.

4 is a pump for circulating the above greenhouse heating water;
Reference numerals 5 and 5 designate electromagnetic valves for controlling the circulation of greenhouse heating water to the radiator pipe 2 in the greenhouse by turning it on or off or increasing or decreasing it.

The heat absorption side (freon expansion vaporization part) of the heat pump 3 is connected to the groundwater pumped up by the pump 7 through a pumping pipe 6 that is driven into the ground. The groundwater is returned to the ground by gravity through a return pipe 8 which is installed in a separate underground location apart from the pipe 6.

Although the above-mentioned return pipe 8 is shown as two branches in the drawing, it may be unbranched or branched into three or more pipes, depending on the degree of difficulty in returning groundwater underground.

In addition, the opening positions of both pipes 6 and 8 in the ground must be installed with a sufficient distance (horizontal and/or horizontal direction) to avoid mixing of the groundwater in both pipes. .

According to the above device, the groundwater pumped up through the pipe 6 comes into contact with the heat absorption side of the heat pump 3 to expand and vaporize the cold soot Freon, and then returns to the ground through the pipe 8. On the heat dissipation side, the heating water that is circulating in contact with this is heated by the heat dissipation due to the compression and condensation of Freon, so this heated heating water heats the greenhouse while passing through the heat dissipation pipe 2 inside the greenhouse. I will do it.

The underground water return system is a closed system that connects the pumping pipe 6, the pumping pump 7, the heat pump 3, and the return pipe 8. An air bleed C is performed at an arbitrary position leading to the lower end B, preferably a portion of the pipe 8 near the ground, and the air introducing pipe 11 is led out from this air bleed C. As a result, the air flows from the pipe 11 through the air vent C into the pipe 8, so that groundwater can be returned underground more smoothly than the pipe 8 without increasing the head height of the system line 10.

Note that 9 is a pipe line for replenishing water to the heat dissipation pipe 2.

Embodiment 2 In this embodiment, the pumping pipe 6 and the return pipe 8 are constructed by driving into the ground as double inner and outer pipes of the same circular shape, and the lower ends of the pipes 6 and 8 are provided with a height difference.

The rest is the same as in the first embodiment.

[Brief explanation of the drawing]

FIG. 1 is a system explanatory diagram showing a first embodiment of the present invention, and FIG. 2 is a system diagram showing a second embodiment of the present invention. 1...Circulation system path, 3...Heat pump, 6
...Pipe for pumping up underground water, 8...
Groundwater return rare pipe, 10... Groundwater return system path, 11... Air introduction pipe. Figure 1 Figure 2

Claims (1)

[Claims] 1. After the groundwater that has been pumped above the ground is subjected to heat exchange using a heat pump, this heat-exchanged groundwater is returned underground at a surface location away from the above-mentioned pumping location, or at a location on the ground surface that is the same as the above-mentioned pumping location. In the heat utilization of groundwater that is returned to the ground at a location and at a distance in the depth direction,
The groundwater return system from pumping up the groundwater to returning to the ground through the heat pump is a closed system, and air is vented to the groundwater return system from the groundwater exiting the heat pump to returning to the ground. A groundwater reduction method characterized by: