JPH0320656B2 - - Google Patents

Description

Detailed Description of the Invention "Industrial Application Field" The present invention uses a dam having a depth of at least 10 m or more to effectively utilize winter or spring low-temperature water stored in the dam. This article relates to a heating and cooling method that utilizes natural heat.

"Conventional technology and its problems" Since dams built all over Japan are generally built in mountainous areas with heavy snowfall, low-temperature water such as snowmelt water in winter or spring flows from rivers and slopes of mountains. A lot of inflow. The low-temperature water that has flowed into the vicinity of the upper layer of the low-temperature water is heated by sunlight or by the inflow of normal-temperature water in the summer, and its temperature increases, but the low-temperature water that has flowed into the vicinity of the deep bottom of the dam is The upper layer of water acts as an insulator, maintaining a constant low temperature throughout the year.

As shown in Figure 2, the temperature is approximately 7℃ even at dams in relatively warm regions from Kanto to Chubu.
The temperature is even lower at around 5 degrees Celsius at dams around the area, Hokkaido, the Tohoku region, and the Shinetsu Mountains.

Therefore, since such low-temperature water is unsuitable for agricultural irrigation, the opening of the water intake pipe is generally located above the low-temperature water retention position,
Since room-temperature water is sampled from above, only a shallow and limited portion of the water is always used, and most of the water below remains stagnant for a long period of time, becoming what is called dead water. Put it away.

An object of the present invention is to provide a heating and cooling method using natural heat that is useful for leveling out peak power consumption, especially in summer, by making effective use of such dead water.

"Means for Solving the Problems" In order to achieve the above-mentioned technical problems, the present invention aims to drain the low-temperature dead water that remains in the dam at a depth of at least 10 m during the summer.
The first feature is that the water is led to the urban area located downstream of the dam and used for cooling purposes.

At this time, since the dam is generally far from the city area and the direct sunlight is strong in summer, the temperature of the low-temperature water increases in the surface conduit and cannot be used for air conditioning. Therefore, the conduit is preferably buried underground where it is not affected by direct sunlight and is maintained at a lower temperature than the outside air, and if necessary, it is preferable to use an insulated conduit.

The second feature of the present invention is that the discharged water heated by the use of air conditioning is stored underground again as underground recharge water at a temperature of 15 to 20°C until the winter season.
After maintaining the temperature above and below, the underground recharge water whose temperature is maintained is pumped up during the winter and used as heat source water for the heat pump.

The water discharged after being used as a heat source water for the heat pump cannot be reused as a heat source because the temperature drops to about 8 to 15 degrees Celsius, but it is fully possible to use it as water for snow melting. In a preferred embodiment of the present invention, the third feature is that the discharged water is used for snow melting in winter.

"Embodiments" Hereinafter, preferred embodiments of the present invention will be described in detail by way of example with reference to the drawings.

Figure 2 shows the annual water temperature distribution map of irrigation industrial water dams in the relatively warm Kanto Plain.

According to this, low temperature water of +5 to 8 degrees Celsius is likely to accumulate at a depth of 12 to 13 meters or less throughout the year.

Therefore, as shown in Fig. 1, the dam 1 is constructed by using the outlet pipe 2, which has an opening 2a near the bottom of the dam 1 reservoir of 12 to 13 m or less where the low-temperature water is accumulated, as an underground conduit.
By piping to the urban area 3 located on the downstream side, low-temperature water, which has not been used as dead water in the past, can be guided to the cooling pipes of each house in the urban area 3 while maintaining its low temperature state, and as a result, the low-temperature water can be It can be used as cooling water during the summer months from June to September.

At this time, since the low-temperature water is maintained at at least approximately 5 to 8 degrees Celsius, there is no need to cool it with a refrigerator, and the water can be directly led to the indoor air conditioner 4 for cooling. Daytime electricity demand during the summer will drop significantly.

Of course, if necessary, the low-temperature water can be used as cooling water for engineering purposes other than air conditioning, and after use, it can also be used as gray water for washing hands and the like.

Then, due to the heat exchange by the above-mentioned air conditioner, approximately 12 to 20℃
The cold and hot water heated nearby is returned to the underground recharge well 5 near the urban area and recharged underground.

Such an underground recharge well 5 is easily formed by vertically erecting sheet piles 5a in the ground, as is known.

In the underground recharge well 5, the surrounding ground and groundwater itself are maintained at around 15 to 20°C, so the temperature is maintained at around 15 to 20°C until winter without being affected by outside air.

Then, during the winter season from December to March, the recharge water at a temperature of around 15 to 20 degrees Celsius is sucked up from the recharge well 5 and sent to each house as a heat source for the winter heating heat pump 6.
Heating is performed using the heat raised by the heat pump 6.

The discharged water after being used as a heat source for the heat pump 6 has a temperature of about 8 to 15° C. due to heat absorption by the heat pump 6, and therefore is generally discharged as is into a river 7 or the like.

However, even low-temperature water of around 8 to 15 degrees Celsius can be used as snow melting water, so in snowy areas such as the Sea of Japan coast, snow melting is done by spraying the discharged water on roofs, roads, etc. It is best to release it into rivers7 or the sea through side gutters. As a result, this will lead to an improvement in the ground subsidence problem that currently occurs when snow is removed by pumping up groundwater, and the power consumption required for pumping up groundwater will become unnecessary, reducing operating costs.

Furthermore, in the dam 1, melted snow water from mountain areas during winter and spring is stored again in the dam 1 through rivers 7 and mountain slopes, and is stored as low-temperature water for cooling the next summer, and this process is repeated thereafter. .

Therefore, this embodiment can be used effectively especially in cities on the Sea of Japan side where large dams exist on the back side, and in cities in Tohoku-Hokuriku Prefecture where there is a possibility of using large dams for purposes other than power generation. When used, its practical value is extremely great.

"Effects of the Invention" As described above, according to the present invention, by using dams and underground recharge wells, cold energy that should normally be stored or discharged can be stored without any special expense until the desired season. It aims to make effective use of
However, since this energy is not artificial energy such as electric power, but natural energy, there is no room for environmental destruction or pollution.

Furthermore, the low-temperature water derived from the dam can be used not only as cooling water but also as drinking water, irrigation water, industrial water, and fire prevention water.

Moreover, as mentioned above, it is possible to cool the air without using a refrigerator in the summer, which leads to a significant reduction in the power peak in the summer, and the use of the heat pump 8 during the low demand period in the winter can reduce the power demand. By raising the bottom, the annual demand for electricity will be leveled out, which will lead to more effective use of power generation facilities, and will also be able to fully meet the demand for industrial electricity even in the summer.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing a system according to an embodiment of the present invention, and FIG. 2 is an explanatory diagram showing a distribution map of water stored in a dam.

Claims (1)

[Claims] 1. Using a dam with a depth of at least 10 m or more, low-temperature water such as snowmelt water is stored in the dam in the winter and spring, and then remains in a relatively deep part of the dam in the summer. The low-temperature water is led to the city area and used as water for air conditioning.The water heated by the cooling is then stored again as underground recharge water, and in the winter, the underground recharge water is pumped up and used as heat source water for heat pumps. A heating and cooling method using water stored in a dam. 2. The heating and cooling method according to claim 1, wherein the water discharged after being used as the heat source water of the heat pump is used for melting snow in winter. 3. The heating and cooling method according to claim 1 or 2, wherein the low-temperature water is led to an urban area through an underground conduit.