JPS5811529B2 - How to use groundwater - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a groundwater utilization method, and in particular, artificially replenishing groundwater, enriching the groundwater, and forming warm water zones and cold water zones in the groundwater layer, thereby storing heat in the groundwater. death,
This relates to a groundwater utilization method that pumps up groundwater that has stored heat and uses this heat.

Conventional groundwater use simply involves digging wells and pumping up groundwater, and even if this is used for heating and cooling purposes, the actual state of groundwater use in Japan is that after use, the used water is simply discharged. Ta.

Considering that groundwater is a limited and valuable underground resource, this is a waste of underground resources, and pumping up large amounts of groundwater also risks causing land subsidence.

The purpose of this invention is to eliminate the disadvantages of conventional groundwater use such as slope, and to provide a groundwater use method that can effectively utilize groundwater without depleting groundwater, which is an underground resource. By replenishing groundwater during the cold winter months, cold water is injected and replenished to form a cold water zone in the underground aquifer, which is then pumped up and used in the summer, and hot water is replenished underground after use. By forming a warm water zone underground and using this hot water in the winter, a method of utilizing groundwater is provided in which the underground is used as a place for storing heat and cold.

By pumping up cold water injected in the winter in the summer, it is possible to pump up groundwater that is much colder (approximately 7° to 10°C) than the normal temperature of groundwater in nature (approximately 12° to 15°C). .

After such low-temperature water is used in the summer (for example, for air conditioning), warm water, whose temperature has been raised to a temperature close to the outside temperature, is injected deep into the ground through an injection well, creating a warm water zone in the aquifer.

Next, if groundwater is pumped up from this warm water zone during the winter, the temperature will be higher than the normal temperature of groundwater in nature (approximately 12° to 15°C).
It is possible to obtain groundwater with a temperature of approximately 23°C to 25°C, and such groundwater can be used for heating and for extinguishing lightning in snowy regions.

The invention will now be described in detail with reference to the illustrated embodiments.

Figure 1 shows the usage status in the summer, where pumping pump 2 pumps water from pumping well 1 (dug) in cold water zone C to low temperature (7°C).
Groundwater (~10°C) is pumped up and sent to a heat exchanger 4 indoors H through a pumping pipe 3, and indoor air is circulated over the heat exchanger 4 by a cooling fan 5 to be used for cooling with cold water.

The final water after cooling is carried to the rooftop through a pipe 6 and is sprinkled onto the roof 8 through a watering nozzle 7 to absorb solar energy E.

This causes the water temperature to rise to a temperature that is almost close to the outside air temperature.

For example, if the midsummer daytime temperature is 30°C, the temperature of the final water used for indoor cooling is approximately 20°C, and if this final water is sprinkled on the rooftop to absorb solar heat, it will be close to the outside temperature. Water temperature rises to 27° to 29°C.

Therefore, by guiding the warm water heated in this way to the injection well 10 through the pipe 9 and injecting it deep underground, each underground layer is heated, and at the same time, the injected hot water spreads the warm water zone. is born.

In the figure, A indicates an impermeable layer, and B indicates a constant temperature water zone.

Furthermore, in the winter, as shown in Figure 2, high temperatures (23°
~25℃) is pumped up and sent indoors via pumping pipe 13.
By sending indoor air to a heating heat exchanger 14 located at a heating fan 15 and circulating indoor air over this heat exchanger 14, heating with hot water can be performed.

The final water after heating is carried to the rooftop and site (not shown) through piping 16, and is used to extinguish snow F on the roof 18 by sprinkling it from a water nozzle 17.

This brings the water temperature close to the outside temperature.

For example, the temperature of groundwater pumped from a warm water zone is higher (23° to 2°C) than the normal temperature of natural groundwater (about 12° to 15°C).
After using it for heating at a temperature of 5° C. and then for lightning suppression, the water temperature is lowered to a temperature (5° to 7° C.), which is much lower than the normal temperature of natural groundwater (12° to 15° C.).

This temperature-reduced final water is led underground again through a pipe 19 and injected deep underground through an injection well 20 to create a cold water zone C in the aquifer.

As described above, in this invention, underground water is pumped up and used at a temperature lower than normal temperature in the high-temperature summer and higher than normal temperature in the winter, and the temperature is raised (summer) or lowered (winter) to near the ambient temperature. Since the remaining water is returned underground and stored, energy can be saved and used by making full use of the temperature difference, and groundwater resources can be used effectively without wasting them. It greatly contributes to resource and energy conservation.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional side view showing an example of the usage situation in the summer season of the groundwater usage method of the present invention, and FIG. 2 is an explanatory diagram of the usage situation in the winter season. A: impermeable layer, B: constant temperature water zone, C
...Cold water zone, D...Warm water zone, 1,11
...Pumping well, 2,12...Pumping pump, 3,13...Pumping pipe, 4,14...
Heat exchanger, 5... Cooling fan, 6, 16...
...Piping, 7,17...Water nozzle, 8,
18...roof, 9,19...pipe, 10
, 20...Water injection valve, 15...Heating fan.

Claims (1)

[Claims] 1. After performing heat exchange using the groundwater pumped up from the underground warm water zone during the cold season as a heat medium, the low temperature groundwater is returned underground from the injection well to form a cold water zone underground. A groundwater utilization method characterized by performing heat exchange using groundwater pumped up from an underground cold water zone as a cooling medium, and then returning the high temperature medium to the underground through an injection well to form a warm water zone underground.