JP2001041479A - Air conditioning system utilizing geothermal heat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently air condition and to reduce a cost by embedding a thermal storage container under the ground, and arranging a vent passage for passing air as a heating medium through a thermal storage layer of the container. SOLUTION: The air in a room of a building 3 is circulated to a room through a vent tube 21, a heat exchanging vent pipe 14 in a tank 11, a vent tube 22, a supply fan 23 and a filter 24 by driving the fan 23. Water in the tank 22 under the ground 2 stores a geothermal energy so that its temperature is stabilized. When the air passes the pipe 14 in the tank 11, the air heat exchanges with the water 13 in the tank 11. That is, when a temperature of the air in the room is lower than that of the water 13 in the tank 11 in winter season or the like, the air is heated, and the room of the building 3 is heated. Meanwhile, when the temperature of the air in the room is higher than the temperature of the water 13 in the tank 11 in summer season or the like, the air is cooled, and the room of the building 3 is cooled.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a geothermal air conditioning system.

[0002]

Conventionally, in an air conditioning system for heating or the like utilizing geothermal energy, for example,
As described in JP-A-32728, a tube through which a heat medium for heat exchange passes is buried directly in the ground. Alternatively, as described in, for example, JP-A-8-73344, stone or concrete provided under the floor of a building is used as a heat storage layer.

[0003] However, when heating stones or concrete by geothermal heat, it is difficult to maintain a stable temperature because stones and concrete have a small heat capacity and drastically change in temperature.

Further, the conventional air-conditioning system in which pipes are directly buried in the ground has to excavate 3 to 4 m or more underground and bury huge piles and pipes at the time of construction. Hit. In addition, huge piles and pipes are custom-made, resulting in high costs.

An object of the present invention is to solve such a problem, and an object of the present invention is to provide a geothermal air-conditioning system capable of performing efficient air-conditioning and being inexpensive.

[0006]

According to a first aspect of the present invention, there is provided an air conditioning system utilizing geothermal energy, wherein a heat storage container containing water forming a heat storage layer therein is buried underground to achieve the above object. An air passage that allows air as a heat medium to pass through the heat storage layer of the heat storage container is provided.

By passing air through the air passage, heat exchange is performed between the air and water forming the heat storage layer, and the air is used for air conditioning. Water has a much larger heat capacity than stone or concrete, which has been conventionally used as a heat storage material. Therefore, since the temperature is stable, geothermal energy can be stably used.

According to a second aspect of the present invention, in the geothermal air-conditioning system according to the first aspect of the present invention, a double duct is provided in the ventilation path for blowing air that has undergone heat exchange in the heat storage layer. It is.

As a result, dew condensation, cooling of warm air in the ventilation path or warming of cool air can be prevented.

According to a third aspect of the present invention, in the geothermal air conditioning system according to the first or second aspect of the present invention, the heat storage layer is provided with a heat storage material in addition to water.

Although a tank such as a plastic tank can be used as the heat storage container, even when the size of the tank is limited, the heat capacity can be increased by a heat storage material different from water. Yes, sufficient heat capacity can be secured.

According to a fourth aspect of the present invention, in the geothermal air conditioning system according to any one of the first to third aspects, a greenhouse-like space for plants is provided in the ventilation path in addition to the first air purification filter. A second air cleaning filter is provided.

For example, when air containing carbon dioxide circulated from the room passes through the second air purifying filter, the air is purified at room temperature at which the plant performs photosynthesis and emits oxygen, and is reduced into the room. You. An ozone effect can also be expected.

According to a fifth aspect of the present invention, in the geothermal air-conditioning system according to any one of the first to fourth aspects, a latent heat storage material such as sodium acetate or sodium sulfate is used as the heat storage layer instead of water. It is.

As described above, the heat storage layer is not limited to water, and an appropriate latent heat storage material can be used.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a geothermal air-conditioning system according to the present invention will be described below with reference to the drawings.
In FIG. 1, 1 is the ground, 2 is the ground, and 3 is a building such as a house on the ground.

Reference numeral 11 denotes a tank as a heat storage container, and this tank 11 is buried underground 2 in the basement of the building 3 or the like. As the tank 11, a commercially available product such as a so-called plastic tank made of plastic can be used. Then, water 13 is stored in the tank 11 as the heat storage layer 12. In addition, a heat exchange ventilation pipe 14 forming an air passage is passed through the heat storage layer 12 of the tank 11. The heat exchange ventilation pipe 14 allows air as a heat medium for heat exchange to pass therethrough. For example, a metal flexible pipe made of stainless steel can be used. In this embodiment, the heat exchange ventilation pipe 14 is formed by spirally winding a long pipe, and is piped in the tank 11 so as to sink into the tank 11 from above. That is, the inlet portion 14a and the outlet portion 14b of the heat exchange ventilation pipe 14 with respect to the tank 11
On the top.

The inlet 14a and the outlet 1
Ventilation pipes 21 and 22 forming ventilation paths connected respectively to 4b are piped to the building 3. The ventilation pipe 21 for intake to the ventilation pipe 14 for heat exchange communicates with the exhaust port in the room of the building 3,
The ventilation pipe 22 for exhaust from the ventilation pipe for heat exchange 14 communicates with an air intake port in the room via a blower fan 23 and an air purification filter 24. In particular, it is preferable that the ventilation pipe 22 for blowing the air that has undergone heat exchange in the tank 11 be a double duct as shown in FIG. This double duct has a double structure of an outer tube 26 and an inner tube 27 inserted into the outer tube 26, and the air that has exchanged heat in the tank 11 passes through the inner tube 27.
The gap 28 between the outer tube 26 and the inner tube 27 forms a heat insulating layer.

It is preferable to use, as the air purifying filter 24, a second air purifying filter utilizing a greenhouse-like space of a plant in addition to the normal first air purifying filter.

Next, the operation of the above configuration will be described. When the blower fan 23 is driven, the air in the room of the building 3 is ventilated by the ventilation pipe 21 and the tank, as indicated by the broken arrows in FIG.
Heat exchange ventilation pipe 14, ventilation pipe 22, and blower fan 23 in 11
And is returned to the room through the filter 24. In this way, an airflow circulating in the room and in the tank 11 is generated.

The water 13 in the tank 11 in the underground 2 is a substance having a relatively large heat capacity, but stores geothermal energy and has a relatively stable temperature. Then, when the air passes through the heat exchange vent pipe 14 in the tank 11, the air exchanges heat with the water 13 in the tank 11. That is, in winter,
When the temperature of the air in the room is lower than the temperature of the water 13 in the tank 11, the air is heated, thereby heating the room of the building 3. On the other hand, in the summer, etc.
When the temperature of the air in the room is higher than the temperature of 13, the air is cooled, and thereby the room of the building 3 is cooled.

The water 13 has a much larger heat capacity than stone or concrete which has conventionally been used as a heat storage material for utilizing geothermal energy, so that energy can be stably maintained and the temperature can be stabilized. Therefore, the temperature of the air supplied to the room becomes stable, and geothermal energy can be stably utilized throughout the year.

Further, according to the configuration of the above embodiment, since a long pipe is spirally wound as the heat exchange ventilation pipe 14 in the tank 11, the heat exchange can be performed more reliably.

Further, since the ventilation pipe 22 for blowing the air which has exchanged heat with the water 13 in the tank 11 is formed as a double duct, dew condensation, cooling of the warm air in the ventilation pipe 22 or warming of the cool air can be prevented. , More effective use of energy by heat exchange.

Further, since the heat medium for performing heat exchange with the water 13 in the tank 11 is the air itself circulating between the room and the room, the cost can be further reduced as compared with the case where a dedicated heat medium is used. .

In addition, since a low-cost tank such as a commercially available plastic tank can be used as the tank 11, the cost can be further reduced.

Further, by additionally using a second air purifying filter utilizing a greenhouse-like space of a plant as the air purifying filter 24, the air containing carbon dioxide circulated from the room can be removed. By passing the green (vegetable) filter at room temperature, the plant is photosynthesized and purified at room temperature where oxygen is released, and is reduced indoors. An ozone effect can also be expected.

As described above, according to the geothermal air-conditioning system, efficient air-conditioning can be performed and the cost can be reduced.

The present invention is not limited to the above embodiment, and various modifications can be made. For example, a latent heat storage material 31 such as sodium acetate or sodium sulfate may be provided in the heat storage layer 12 in the tank 11 in the underground 2 in addition to the water 13. Thereby, even when the size of the tank 11 is limited, the heat storage material 31 can increase the heat storage amount, and can secure a sufficient heat capacity. Further, a substance for preventing freezing may be added to the water 13 in the tank 11.
As a result, even in winter or cold regions,
Freezing of the water 13 can be prevented. Further, a substance for preventing the decay of water may be added to the water 13. Thereby, the rot of the water 13 can be prevented. Further, in addition to the substance for preventing freezing or the substance for preventing decay, various other substances can be mixed into the water 13 for an appropriate purpose.

[0030]

According to the geothermal air conditioning system of the first aspect of the present invention, a heat storage container containing water forming a heat storage layer is buried in the ground, and the heat storage container passes through the heat storage layer. In addition, since a ventilation path for passing air as a heat medium is provided, it is possible to provide a geothermal utilization air conditioning system capable of performing efficient air conditioning and being inexpensive.

Further, according to the geothermal utilization air conditioning system of the second aspect of the present invention, since the ventilation passage for blowing the air that has exchanged heat in the heat storage layer is a double duct, dew condensation and cooling of warm air in the ventilation passage are performed. Alternatively, the warming of cold air can be prevented, and the energy obtained by heat exchange can be more effectively utilized.

According to the third aspect of the present invention, since the heat storage material is provided in the heat storage layer in addition to the water, the amount of heat stored in the heat storage layer can be increased. Even when the size of the container is limited, a sufficient heat capacity can be secured.

Further, according to the geothermal air conditioning system of the invention of claim 4, in addition to the first air purifying filter, the second air purifying filter utilizing a greenhouse-like space of a plant in the ventilation path. The air passing through the ventilation path,
In particular, air containing carbon dioxide can be effectively purified.

Similar effects can be obtained by using a latent heat storage material such as sodium acetate or sodium sulfate instead of water for the heat storage layer as in the geothermal utilization air conditioning system of the fifth aspect.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing one embodiment of a geothermal utilization air conditioning system of the present invention.

FIG. 2 is a perspective view showing a cross section of a part of the double duct.

[Explanation of symbols]

2 Underground 11 Tank (Heat storage container) 12 Heat storage layer 13 Water 14 Ventilation pipe for heat exchange (Ventilation path) 21 Ventilation pipe (Ventilation path) 22 Ventilation pipe (Ventilation path, double duct) 24 Air purification filter (No. 1) Air purifying filter,
Second air purifying filter) 31 Heat storage material

Claims (5)

[Claims] 1. A heat storage container containing water forming a heat storage layer therein is buried in the ground, and an air passage for passing air as a heat medium is provided through the heat storage layer of the heat storage container. A geothermal air conditioning system characterized by the following. 2. The geothermal air-conditioning system according to claim 1, wherein the ventilation path in the ventilation path through which the air subjected to the heat exchange in the heat storage layer is blown is a double duct. 3. The geothermal air conditioning system according to claim 1, wherein a heat storage material is provided in addition to water in the heat storage layer. 4. A filter according to claim 1, wherein a second air purifying filter utilizing a greenhouse-like space of a plant is provided in the ventilation path in addition to the first air purifying filter. The geothermal utilization air conditioning system according to any one of the preceding claims. 5. The geothermal air conditioning system according to claim 1, wherein a latent heat storage material such as sodium acetate or sodium sulfate is used as the heat storage layer instead of water. Geothermal air conditioning system.