JP2007183022A - Air conditioning method and device utilizing geothermal heat - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air conditioning method utilizing geothermal heat and its device capable of effectively utilizing geothermal heat in air conditioning by exchanging heat between the outdoor air and the indoor air. <P>SOLUTION: This air conditioning method comprises a geothermal heat exchanging portion 1, a heat releasing portion 2 disposed inside the room, a circulating passage 3 for circulating a heat medium between the geothermal heat exchanging portion 1 and the heat releasing portion 2, and a heat exchanging/ventilating device 4, and the heat exchanging/ventilating device 4 comprises a first heat exchanging portion 9 exchanging heat between the outdoor air and the indoor air, and a second heat exchanging portion 10 exchanging heat between the outdoor air taken inside the room, and the geothermal heat, in taking the outdoor air into the room, and discharging the indoor air to the outside of the room. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a geothermal air conditioning method and apparatus capable of using geothermal heat for indoor air conditioning.

  As an example of a technique in which heat is exchanged between the outside air and the indoor air during air conditioning in which the outside air is taken into the room and the indoor air is exhausted to the outside, the one described in Patent Document 1 is disclosed. Are known. This technology includes a supply-side pipe that takes outside air into the room and an exhaust-side pipe that exhausts indoor air to the outside, and performs heat exchange between the air that passes through the supply-side pipe and the air that passes through the exhaust-side pipe. It is like that.

Moreover, the thing of patent document 2 is known as an example of the air-conditioning system using geothermal. In this technology, a water / water heat exchanger installed on the ground and a first internal passage formed by an internal space of a first pipe buried vertically in the ground in a water circulation path in which a water feed pump is interposed The air that has undergone heat exchange with the water in the water passage while passing through the air passage of the air-to-water heat exchanger is used for air conditioning of the building.
Japanese Patent No. 3059728 Japanese Patent No. 3340331

By the way, in the technique described in Patent Document 1, heat exchange is performed between outside air and indoor air when air conditioning is performed. However, when the temperature difference between outside air and indoor air is large, Since the temperature difference between the outside air exchanged and introduced into the room and the room air becomes relatively large, energy (electric power, etc.) consumed by the air conditioner to keep the room air at a desired temperature is increased.
Moreover, in the technique described in Patent Document 2, geothermal heat is used for air conditioning of a building, but it is used for air conditioning in which heat is exchanged between the outside air and indoor air as described above. It has not been.

  The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a geothermal air conditioning method and apparatus that can effectively use geothermal heat in an air conditioner that performs heat exchange between outside air and indoor air. It is said.

  In order to solve the above problem, the invention according to claim 1 is a geothermal air-conditioning method, wherein when the outside air is taken into the room and the room air is exhausted to the outside, the outside air and the room air are Heat exchange is performed between the outside air taken into the room and geothermal heat while performing heat exchange between the two.

Here, the warm season means a period from summer to autumn, and the cold season means a period from winter to spring.
Such a geothermal air conditioning method can be performed using, for example, a geothermal air conditioning apparatus as shown in FIG.
In this case, outside air is taken in by the supply side pipe 7, and indoor air is exhausted by the exhaust side pipe 8. In addition, heat exchange between the outside air and indoor air is performed in the first heat exchange unit 10, and heat exchange between the outside air and the geothermal heat taken into the room is performed in the second heat exchange unit 10. And heat exchange in the 2nd heat exchange part 10 is performed via water as a heat carrier.

  According to the first aspect of the present invention, when heat exchange is performed between the outside air taken into the room and the air exhausted from the room, the heat exchange is performed between the outside air and the geothermal heat. Since the geothermal heat is constant at around 15 ° C. throughout the year, the temperature of the outside air taken into the room during the warm season falls due to heat exchange, and the outside air taken into the room during the cold season rises due to heat exchange. The temperature difference between the outside air taken into the room and the room air can be reduced, so that the energy (such as electric power) consumed by the air-conditioning apparatus to keep the room air at a desired temperature can be suppressed using geothermal heat.

Invention of Claim 2 is the geothermal utilization air-conditioning method of Claim 1,
Heat exchange is performed between geothermal heat and indoor air during the warm season, and heat exchange is not performed between geothermal heat and indoor air during the cold season.

  Such heat exchange is performed by, for example, the radiation panel 2 of the geothermal air conditioner as shown in FIG. Water as a heat medium is supplied to the radiation panel 2 from the ground.

According to the second aspect of the present invention, the temperature of the room can be lowered by exchanging heat between the geothermal heat and the room air during the warm period, so that the room air can be maintained at a desired temperature. Energy (electric power) consumed by the cooling device can be suppressed.
Also, geothermal heat is constant at around 15 ° C throughout the year, so if heat is exchanged between geothermal heat and indoor air during the cold season, the indoor temperature may drop when the room is heated. There is. Therefore, by not exchanging heat between the geothermal heat and indoor air during the cold season, the indoor temperature can be prevented from falling when the room is heated, so the indoor air is kept at the desired temperature. Therefore, energy (electric power etc.) consumed by the heating device can be suppressed.

Invention of Claim 3 is the geothermal utilization air-conditioning method of Claim 2,
A heat medium is circulated between the ground and a heat release portion provided in the room, thereby exchanging heat between the geothermal heat and the air in the room.

  Water is preferably used as the heat medium, but a liquid such as oil other than water or a gas such as air can also be used as the heat medium.

  According to the invention described in claim 3, since the heat medium is circulated between the underground and the heat release portion in the room, heat exchange can be easily and continuously performed between the geothermal heat and the indoor air. Can do.

The invention according to claim 4 is a geothermal air conditioner, for example, as shown in FIGS. 1 to 3, and includes a ground heat exchange unit 1 buried in the ground, and the ground heat exchange unit 1. A circulation path 3 for circulating a heat medium (for example, water) between the room and a heat exchange ventilator 4;
The heat exchange ventilator 4 includes a supply side pipe 7 for taking outside air into the room, an exhaust side pipe 8 for exhausting indoor air to the outdoors, and air passing through the supply side pipe 7 and air passing through the exhaust side pipe 8. It is characterized by comprising a first heat exchanging part 9 for exchanging heat between them and a second heat exchanging part 10 for exchanging heat between the heat medium and the air passing through the supply side pipe 7.

According to the fourth aspect of the present invention, the first heat exchanging unit 9 between the outside air taken into the room through the supply side pipe 7 of the heat exchange ventilator 4 and the air exhausted from the room through the exhaust side pipe 8. When heat exchange is performed, heat exchange is performed between the outside air and geothermal heat as follows.
That is, the heat medium circulates between the ground and the room through the circulation path 3 (including the branch path 6 in FIG. 1), and the air (outside air) passing through the circulation heat medium and the supply side pipe 7. Heat exchange is performed between the outside air and the geothermal heat through a heat medium by performing heat exchange with the second heat exchange unit 10. Since the geothermal heat is constant at about 15 ° C. throughout the year, the temperature of the outside air taken into the room through the supply side pipe 7 during the warm period decreases due to heat exchange, and during the cold period, the supply side pipe 7 Since the outside air taken in through the air rises due to heat exchange, the temperature difference between the outside air taken into the room and the room air can be reduced, and thus the energy consumed by the air conditioning unit to maintain the room air at a desired temperature ( Power) can be suppressed using geothermal heat.

Invention of Claim 5 is the geothermal utilization air-conditioner of Claim 4,
A heat release part 2 is provided in the room, and the middle of the circulation path 3 is connected to the heat release part 2.
A branch path 6 that branches from the circulation path 3 and reaches the circulation path 3 again is connected to the circulation path 3, and the second heat exchange unit 10 is provided in the middle of the branch path 6. A switching valve 5 is provided at a branch portion between the circulation path 3 and the branch path 6.

According to the fifth aspect of the present invention, for example, as shown in FIG. 2, by operating the switching valve 5 during the warm period so that the heat medium does not pass through the branch path 6, the heat medium is kept indoors. It circulates between the provided heat release part 2 and the underground heat exchange part 1. Therefore, since geothermal heat of about 15 ° C. can be released from the heat release unit 2 and the indoor temperature can be lowered, energy (electric power) consumed by the cooling device to keep the indoor air at a desired temperature can be suppressed. it can.
Further, by operating the switching valve 5 so that the heat medium passes through both the branch path 6 and the circulation path 3, geothermal heat is released from the heat release unit 2 and the circulating heat medium and the supply side By exchanging heat with the air (outside air) passing through the pipe 7 by the second heat exchanging unit 10, heat exchange is performed between the outside air and the geothermal heat via a heat medium, and the outside air to be taken into the room The temperature falls. Therefore, the energy (electric power) consumed by the cooling device to keep the indoor air at a desired temperature can be suppressed.
Since geothermal heat is constant at around 15 ° C throughout the year, if heat is exchanged between geothermal heat and room air during the cold season, the room temperature will increase if the room is heated to around 20 ° C, for example. There is a risk of falling. Therefore, as shown in FIG. 3, by operating the switching valve 5 in the cold season so that the heat medium does not pass through the circulation path 3 toward the heat release unit 2, the heat medium that circulates in the branch path 6. Heat exchange is performed between the outside air and the geothermal heat by performing heat exchange between the air and the air (outside air) passing through the supply side pipe 7 by the second heat exchanging unit 10. The temperature of the outside air taken in increases. Therefore, the energy (electric power) consumed by the cooling device to keep the indoor air at a desired temperature can be suppressed.

  According to the present invention, when heat exchange is performed between the outside air taken into the room and the air exhausted from the room, the heat exchange between the outside air and the geothermal heat allows the outside air to be taken into the room and the room air. Therefore, the energy (such as electric power) consumed by the air conditioner to keep the indoor air at a desired temperature can be suppressed using geothermal heat.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 shows a schematic configuration of a geothermal air conditioning apparatus according to the present invention. This geothermal air-conditioning apparatus connects the underground heat exchange part 1 buried in the ground, the heat release part 2 provided indoors, the heat release part 2 and the underground heat exchange part 1, It is schematically configured to include a circulation path 3 for circulating a heat medium between the underground heat exchange unit 1 and the heat release unit 2 and a heat exchange ventilator 4.

The underground heat exchanging section 1 is a cylindrical material formed of a material excellent in thermal conductivity, corrosion resistance, rust prevention, etc., for example, stainless steel, and the inside is filled with water as a heat medium. ing. The underground heat exchanging section 1 has a length of about 10 m above and below, and the embedment depth is a depth at which the geothermal temperature reaches a constant temperature of about 15 ° C. throughout the year, for example, 5 to It is buried at a depth of about 10m. Further, in the present embodiment, two underground heat exchanging sections 1 are embedded in parallel with each other. In addition, the number of underground heat exchange parts 1 may be three or more as needed, and may be one.
And in this underground heat exchanging part 1,1, heat | fever exchange of internal water and geothermal heat is carried out, and this water is hold | maintained at about 15 degreeC.

  The heat radiation unit 2 is a radiation panel 2 in the present embodiment, and is installed in a room of a building. The radiant panel 2 is formed by meandering long and narrow pipes through which water as a heat medium flows, and can radiate radiant heat from the surface. Such a radiation panel 2 is installed on an indoor wall or ceiling, for example.

The circulation path 3 connects the heat release part 2 and the underground heat exchange part 1 and circulates the heat medium between the underground heat exchange part 1 and the heat release part 2. The first supply paths 3a, 3a connected to the water discharge ports of the exchange units 1, 1 are connected to the supply paths 3a, 3a via the switching valve 5 to supply water as a heat medium to the radiation panel 2. And a return path 3c for returning water from the radiant panel 2 to the underground heat exchanging units 1 and 1, and the return path 3c is branched into two, and the underground heat exchanging unit 1 and 1 is connected to the water intake.
Further, a branch path 6 is connected to the switching valve 5, and this branch path 6 is again connected to the feedback path 3 c of the circulation path 3.
The circulation path 3 and the branch path 6 as described above are constituted by pipes that are provided with measures against heat insulation. The other first supply path 3a is connected to the one first supply path 3a, and a water feed pump P is connected to the middle of the first supply path 3a. .

The heat exchange ventilator 4 is a device that takes in outside air and discharges indoor air, and also performs heat exchange between the outside air to be taken in and the air to be discharged, and a supply side pipe 7 that takes in outside air into the room, A first heat exchanging unit 9 for exchanging heat between the exhaust side pipe 8 for exhausting indoor air to the outdoors, the air passing through the supply side pipe 7 and the air passing through the exhaust side pipe 8, and the branch path 6 And a second heat exchanging unit 10 that exchanges heat between water as a heat medium passing through and air (outside air) passing through the supply side pipe 7.
The supply side pipe 7 has an external suction pipe 7a communicating with the ventilation unit main body 11 from the outside of the building in order to take air outside the building into the room, and the air sucked from the external suction pipe 7a through the ventilation unit main body 11. And an indoor supply pipe 7b for supplying air to the room on the same floor of the building. The front end of the indoor supply pipe 7b is connected to an air supply grill (not shown) provided on the ceiling of the room. Etc., fresh outside air (air) is supplied into the room.
The exhaust side pipe 8 is provided so as to communicate from the ventilation unit main body 11 to the outside in order to exhaust the indoor air sucked from the indoor suction port 11a provided in the ventilation unit main body 11 to the outside.

Further, the first heat exchange unit 9 is provided in the ventilation unit main body 11. The first heat exchanging section 9 is sucked from the indoor suction port 11a located on the indoor side and exhausted to the outside from the outer exhaust side pipe 8, and is sucked from the external suction pipe 7a located on the outdoor side and taken indoors. Heat exchange is performed between the supply pipe 7b and the air supplied to the room, that is, the air discharged outside the room and the air supplied to the room are not directly mixed with the air. Can only be moved. Specifically, a large number of straw-like ultrathin cylindrical tubes made of metal, resin or the like having a high thermal conductivity are arranged. And either one of the air discharged | emitted outside or the air supplied indoors is made to pass through the inside of a straw-shaped cylindrical tube, and the other is made to pass the circumference | surroundings of the cylindrical tube. Thereby, when there is a temperature difference between the air discharged to the outside and the air supplied to the room, the heat having the higher temperature is transmitted to the lower temperature through the thin cylindrical tube. .
The second heat exchange unit 10 is provided on the outer periphery of the external suction pipe 7a, and the second heat exchange unit 10 is connected to the middle of the branch path 6. The second heat exchange unit 10 has the same configuration as the first heat exchange unit, for example. That is, the structure is such that either water as the heat medium flowing through the branch path 6 or air supplied to the room passes through the inside of the straw-shaped cylindrical tube and the other passes through the periphery of the cylindrical tube. Is. As a result, when there is a temperature difference between the water of about 15 ° C. flowing through the branch path 6 and the air supplied to the room, the heat having the higher temperature is transferred to the lower temperature through the thin cylindrical tube. Has been.

Next, a method of performing air conditioning by the geothermal air conditioning apparatus having the above configuration will be described with reference to FIGS.
FIG. 2 shows the state of the geothermal air conditioner in the warm season. First, the switching valve 5 is operated so that water as a heat medium does not pass through the branch path 6. When the pump P is operated, water circulates between the radiation panel 2 and the underground heat exchange units 1 and 1 through the circulation path 3. That is, the water filled in the underground heat exchange units 1 and 1 is supplied to the radiation panel 2 through the first supply paths 3a and 3a, the switching valve 5 and the second supply path 3b. Since the temperature of this water is about 15 ° C., cold heat is radiated from the radiation panel 2 and the temperature of the room is lowered. Along with this, the temperature of water rises. And this water returns to the underground heat exchange parts 1 and 1 again through the return path 3c. Since the geothermal heat is constant at around 15 ° C. throughout the year, the water returned to the underground heat exchanging units 1 and 1 is cooled to about 15 ° C. by heat exchange with the geothermal heat and maintained at this temperature. Then, water as a heat medium is circulated between the radiation panel 2 and the underground heat exchanging units 1 and 1 as described above to continuously radiate cold at about 15 ° C. from the radiation panel 2. Cool the room air. Therefore, the energy (electric power) consumed by the cooling device to keep the indoor air at a desired temperature can be suppressed.

  In the heat exchange ventilator 4, heat exchange is performed by the first heat exchange unit 9 between the outside air taken into the room through the supply side pipe 7 and the air exhausted from the room through the exhaust side pipe 8. A part of water as a heat medium passing through the circulation path 3 may be guided to the second heat exchange unit 10. In this case, the switching valve 5 is operated to guide part of the water to the second heat exchange unit 10 through the branch path 3. Then, heat exchange is performed between the outside air and the geothermal heat through water by performing heat exchange between the water and air (outside air) passing through the supply side pipe 7 by the second heat exchange unit 10. Then, the temperature of the outside air taken into the room through the supply side pipe 4 is lowered by heat exchange, so that the temperature difference between the outside air taken into the room and the room air can be reduced, and thus the room air is kept at a desired temperature. Therefore, the energy (electric power etc.) consumed by the air conditioner can be suppressed using geothermal heat.

FIG. 3 shows a state of the geothermal air conditioner in the cold season.
As described above, geothermal heat is constant at around 15 ° C. throughout the year, so that when heat is exchanged between geothermal heat and indoor air in the cold season, that is, when the radiant panel 2 is used, the room is heated. There is a risk that the temperature of the will drop.
Therefore, in the cold season, the switching valve 5 is operated so that water as a heat medium does not pass through the second circulation path 3 b of the circulation path 3 toward the heat release unit 2. When the pump P is activated, water passes between the second heat exchange section 10 and the underground heat exchange sections 1 and 1 through the first supply path 3a of the circulation path 3, the switching valve 5 and the branch path 6. Circulate. Since the temperature of the water sent to the 2nd heat exchange part 10 from the branch path 6 is about 15 degreeC, this water and the air (for example, about 0 degreeC-5 degreeC in the cold season) passing through the supply side piping 7 The heat exchange is performed by the second heat exchange unit 10 between the outside air and the geothermal heat through the water, and the temperature of the outside air taken into the room rises. The temperature difference between the outside air and the room air can be reduced, so that the energy (such as electric power) consumed by the heating device to keep the room air at a desired temperature can be suppressed using geothermal heat.

  Further, when the room temperature is a low temperature of, for example, 10 ° C. or less in the cold season, the radiation panel 2 may be used. In this case, when the switching valve 5 is operated so that a part of the water flows through the second supply path 3b, the water is supplied to the radiation panel 2. Since the temperature of this water is about 15 ° C., heat of about 15 ° C. is radiated from the radiation panel 2 and the temperature of the room rises. When the room temperature reaches about 15 ° C., the use of the radiation panel 2 is stopped. Thereafter, the room is air-conditioned by the heating device and the heat exchange tube ventilation device 4.

An example of the geothermal utilization air-conditioning apparatus which concerns on this invention is shown, and it is the schematic block diagram. It is a schematic block diagram which shows the state in a warm season equally. It is a schematic block diagram which shows the state in a cold season.

Explanation of symbols

1 Ground heat exchange part 2 Radiant panel (heat release part)
DESCRIPTION OF SYMBOLS 3 Circulation path 4 Heat exchange ventilator 5 Switching valve 6 Branch path 7 Supply side piping 8 Exhaust side piping 9 1st heat exchange part 10 2nd heat exchange part

Claims (5)

  When taking outside air into the room and exhausting indoor air to the outside, heat exchange is performed between the outside air and the indoor air while exchanging heat between the outside air and the geothermal heat. A featured geothermal air conditioning method. In the geothermal air conditioning method according to claim 1,
A geothermal air conditioning method characterized in that heat exchange is performed between geothermal heat and indoor air during the warm season, and heat exchange is not performed between geothermal heat and indoor air during the cold season. In the geothermal air conditioning method according to claim 2,
A geothermal air-conditioning method characterized in that heat is exchanged between geothermal heat and indoor air by circulating a heat medium between the underground and a heat release portion provided indoors. A ground heat exchanger embedded in the ground, a circulation path for circulating a heat medium between the underground heat exchanger and the room, and a heat exchange ventilator,
The heat exchange ventilator exchanges heat between a supply side pipe for taking outside air into a room, an exhaust side pipe for exhausting indoor air to the outdoors, and air passing through the supply side pipe and air passing through the exhaust side pipe. A geothermal air-conditioning apparatus comprising: a first heat exchange unit that performs heat exchange; and a second heat exchange unit that performs heat exchange between the heat medium and air passing through the supply-side piping. In the geothermal air conditioning apparatus according to claim 4,
A heat release part is provided in the room, and the middle of the circulation path is connected to the heat release part,
A branch path that branches from the circulation path and reaches the circulation path is connected to the circulation path, and the second heat exchange unit is provided in the middle of the branch path. A geothermal air-conditioning apparatus characterized in that a switching valve is provided at a branch portion with the route.

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