JP4791895B2 - Geothermal air conditioning system - Google Patents

Description

  The present invention relates to a geothermal air-conditioning system that exchanges heat between outside air in a horizontal pipe buried in the ground, takes the outside air into a room, and performs cooling and heating.

  Conventionally, heat pump type air conditioners using CFCs or alternative CFCs have been used as air conditioning equipment for apartment houses, detached houses, offices and public facilities. Although this heat pump type air conditioner is designed to be highly efficient, its energy efficiency is as low as about 300-500%, so it consumes a lot of electricity and gas when used. It's not right.

  By the way, in the ground several meters deep from the ground, it is difficult to be influenced by the outside air temperature, so a constant temperature of around 15 ° C is maintained throughout the year, and research on air conditioning systems using this geothermal heat has long been conducted. Has been done. Unlike the heat pump type air conditioner described above, this air conditioning system using geothermal heat has the advantage of being economical and environmentally friendly because it hardly uses electricity or gas.

  As this geothermal air conditioning system, for example, an outside air is introduced into a pipe buried substantially horizontally in the ground to exchange heat with the underground heat, and this outside air is taken into the room and air-conditioning is already actually implemented. Further, Patent Document 1 proposes an improved version of this system.

The air conditioning system disclosed in Patent Document 1 introduces outside air into a heat exchanging device embedded in the ground or underwater to exchange heat with the heat in the ground or underwater, and takes the outside air into the room. The heat exchanging device is provided with a water collecting chamber in which condensed water is collected and drainage means for draining the water. In the heat exchange device of this air conditioning system, when high temperature and high humidity outside air such as in summer is introduced into the inside, the outside air is cooled by heat exchange and condensation occurs on the inner wall. However, it has a structure that allows the condensed water to be collected in the above-mentioned water collection chamber, and furthermore, since the water can be drained to the outside by the drainage means, generation of germs such as mold in the heat exchange device is prevented. It can be reduced.
JP 2005-283007 A

  By the way, in the geothermal air conditioning system as described above, a steel pipe having high thermal conductivity and high rigidity is usually used in many cases. However, steel pipes are not only relatively expensive, but because they are heavy, they are very expensive to transport and handle on construction sites, so the initial cost of introducing a geothermal air conditioning system is high. End up. For this reason, hard vinyl chloride pipes that are relatively inexpensive and lightweight are also used, but hard vinyl chloride pipes have a lower thermal conductivity than steel pipes, and they are thin due to the problem of flat strength when buried in the ground. Since it was not possible, there was a problem that the heat exchange rate between the air in the pipe and the underground heat was poor.

  In addition, the air conditioning system disclosed in Patent Document 1 has a mechanism in which condensed water is once stored in a water collection chamber, and is stored to some extent and then discharged by a pump. That is, since water stays in the water collection chamber for a certain period of time, there is a possibility that germs such as molds may propagate during that period, which is insufficient to suppress the generation of germs.

  In addition, when bacteria such as mold are generated in the water collection chamber as described above, the water collection chamber is not isolated from the air path in the heat exchange device, so that malodors generated from bacteria such as mold in the water collection chamber There was a problem that it was taken into a room such as a house.

  The present invention has been made in view of the actual situation, and its purpose is to improve the heat exchange rate between the outside air introduced into the horizontal draw pipe and the underground heat, and the mold such as mold in the horizontal draw pipe. It is providing the geothermal utilization air conditioning system which can suppress generation | occurrence | production of various germs.

In order to solve the above-mentioned problems, the geothermal air conditioning system of the present invention has an outside air introduction pipe vertically embedded from a blowing means arranged on the ground, and one end of a horizontal draw pipe is connected to the lower end of the outside air introduction pipe. And connecting the lower end of the air supply pipe embedded vertically to the other end of the horizontal pipe, and connecting the upper end of the air supply pipe to the indoor unit installed on the ground, through the horizontal pipe by taking the external air which has performed heat exchange between the geothermal heat to the indoor unit, the geothermal air conditioning system for cooling and heating the room, the lateral pulling tube inner surface ing from hard vinyl chloride resin cylinder a cylindrical tube der is, a plurality of annular ribs are formed at predetermined intervals on the outer circumferential surface, forming the thickness of the free thin-walled portion of the annular rib to 1/4 from 1/2 of the generic cylindrical tube of the same internal diameter The configuration is made.

According to such a configuration , the horizontal pipe is made of a hard vinyl chloride resin, and a plurality of annular ribs are formed on the outer peripheral surface at a predetermined interval. Also, the flat strength can be remarkably increased.

In addition , when the thin portion of the horizontal pipe is in the above range, the heat exchange rate between the air in the horizontal pipe and the underground heat can be made significantly higher than the normal cylindrical pipe, Moreover, since the horizontal pulling tube can be significantly reduced in weight, it can be easily transported and handled on the construction site, and the initial cost for introducing this air conditioning system can be reduced.

  Moreover, it is preferable that the said horizontal draw tube is 0.5-3.0 W / m * K in thermal conductivity, and is 0.8 or more in thermal emissivity.

  In this case, the thermal conductivity of the horizontal draw tube is 0.7 to 1.6 W / m · K of soil compared with 0.18 W / m · K of ordinary hard vinyl chloride resin. Therefore, the heat exchange between the air in the horizontal pipe and the underground heat is performed smoothly, and the heat exchange rate is improved. Here, the lower limit value of the thermal conductivity of the horizontal pipe is set to 0.5 W / m · K. If the thermal conductivity is less than this value, the horizontal pipe has air and underground heat. This is because there is a possibility of hindering heat exchange with. In addition, the upper limit of the thermal conductivity of the horizontal pipe is set to 3.0 W / m · K. If the thermal conductivity exceeds this value, the hard vinyl chloride resin has excellent functions such as corrosion resistance and moldability. It is because there exists a possibility of reducing remarkably.

  Also, since the horizontal pipe has a thermal emissivity of 0.8 or more, unlike a normal hard polyvinyl chloride pipe having a thermal emissivity of less than 0.8, the amount of heat remaining in the horizontal pipe itself can be reduced, The heat exchange rate between the air in the pulling tube and the underground heat can be improved.

Further , according to the geothermal air conditioning system of the present invention, the horizontal pipe is embedded so as to be inclined downward toward a shaft provided in the middle of the path, and is exposed in the shaft in the horizontal pipe. The part is provided with pores, and the inside of the horizontal pulling tube is set to a positive pressure, so that water condensed on the inner wall of the horizontal pulling tube is discharged from the fine pores into the vertical hole .

  In this case, since the horizontal pipe is buried so as to be inclined downward toward the shaft provided in the middle of the route, hot and humid outside air such as in summer is cooled by heat exchange in the horizontal pipe and is laterally drawn. Even if condensation occurs on the inner wall of the pipe, the condensed water flows toward the shaft. In the horizontal pipe, the exposed part in the shaft is provided with pores, and the inside of the horizontal pipe is set at positive pressure, so water that has reached the position of the shaft in the horizontal pipe is discharged from the pores into the shaft. can do.

  Therefore, the condensed water does not stay in the horizontal pipe, so there is no risk of mold and other germs in the horizontal pipe, and a large amount of water accumulates in the horizontal pipe and vents in the horizontal pipe. Is not disturbed.

  Further, there may be provided pumping means for pumping up the water stored in the shaft and water supply means for supplying water pumped up by the pumping means to the soil covering the horizontal pipe. .

  In this case, since the water in the vertical hole pumped up by the pumping means is supplied to the soil covering the horizontal pulling pipe by the water supply means, the thermal conductivity of the soil around the horizontal pulling pipe can be increased.

  Therefore, since more earth underground heat around the horizontal pipe can be transmitted to the horizontal pipe, the heat exchange rate between the air in the horizontal pipe and the underground heat can be improved.

In the geothermal air conditioning system according to the present invention, the horizontal draw pipe is embedded so as to be inclined downward toward the shaft provided in the middle of the route, so that hot and humid outside air such as summertime is heated in the horizontal draw pipe. Even if it is cooled by exchange and dew condensation occurs on the inner wall of the horizontal pipe, the condensed water will flow toward the shaft. In the horizontal pipe, the exposed part in the shaft is provided with pores, and the inside of the horizontal pipe is set at positive pressure, so water that has reached the position of the shaft in the horizontal pipe is discharged from the pores into the shaft. can do. Therefore, the condensed water does not stay in the horizontal pipe, so there is no risk of mold and other germs in the horizontal pipe, and a large amount of water accumulates in the horizontal pipe and vents in the horizontal pipe. Is not disturbed.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a schematic diagram showing a geothermal air conditioning system in the present embodiment.

  The geothermal air conditioning system 10 in the present embodiment includes a horizontal pulling tube 20. Further, the geothermal air conditioning system 10 shown in FIG. 1 is provided with a blowing means 51 for introducing outside air into the horizontal pulling pipe 20.

  The horizontal pipe 20 is for exchanging heat between the outside air embedded in the ground and introduced into the pipe with the underground heat.

  The horizontal pulling tube 20 uses a hard vinyl chloride resin. This is because the hard vinyl chloride resin has good corrosion resistance under various environments such as acid and alkali, and the material cost and manufacturing cost are relatively low.

  Further, as shown in FIG. 2, the shape of the horizontal pulling tube 20 is such that a plurality of annular ribs 21 are formed on the outer peripheral surface at a predetermined interval. As a result, the horizontal pulling tube 20 of the present embodiment can drastically improve the flat strength as compared with a normal cylindrical tube. As a result, the horizontal pulling tube 20 of the present embodiment is more than a normal cylindrical tube. In a state where the flattening strength is high, the thickness of the thin portion without the annular rib 21 can be ½ to ¼ of that of a normal cylindrical tube. Therefore, when the thickness of the thin portion of the horizontal pipe 20 is within the above range, the heat exchange rate between the air in the horizontal pipe 20 and the underground heat is significantly higher than that of a normal cylindrical pipe. Moreover, since the horizontal pulling tube 20 can be significantly reduced in weight (for example, around 60%), it can be easily transported and handled on the construction site.

  Further, since the horizontal pulling tube 20 has a high flat strength, there is no restriction on the backfilling soil when the ground 50 is cut and the horizontal pulling tube 20 is buried in the ground. Therefore, the soil generated during the excavation can be used again for backfilling, and it is not necessary to newly prepare light sand and the like, so that the construction cost can be reduced.

  The interval between the annular ribs 21 of the horizontal pulling tube 20 is preferably 8-15% of the inner diameter of the horizontal pulling tube 20, and the thickness of the annular rib 21 is about 3-7 mm. Furthermore, the height of the annular rib 21 is preferably about 2 to 10% with respect to the inner diameter of the horizontal pulling tube 20. By adopting such a structure for the annular rib 21 of the horizontal pulling tube 20, the horizontal pulling tube 20 has a sufficient flat strength to be buried in the ground and contributes most to heat exchange. The area of the 20 thin portions can be sufficiently secured.

  Moreover, it is preferable that the horizontal pulling tube 20 has a thermal conductivity of 0.5 to 3.0 W / m · K and a thermal emissivity of 0.8 or more.

  In this case, the thermal conductivity of the horizontal pulling tube 20 is 0.7 to 1.6 W / m · soil as compared with 0.18 W / m · K for ordinary hard vinyl chloride resin. Since the value is close to K, heat exchange between the air in the horizontal pulling tube 20 and the underground heat is performed smoothly, and the heat exchange rate is improved. Here, the lower limit value of the thermal conductivity of the horizontal pipe 20 is set to 0.5 W / m · K. When the thermal conductivity is less than this value, the horizontal pipe 20 is connected to the air inside the ground and the ground. This is because heat exchange with medium heat may be hindered. Moreover, the upper limit value of the thermal conductivity of the horizontal pipe 20 is set to 3.0 W / m · K. If the thermal conductivity exceeds this value, the excellent functions such as the corrosion resistance and moldability of the hard vinyl chloride resin. It is because there exists a possibility of reducing remarkably.

  In addition, since the horizontal pipe 20 has a thermal emissivity of 0.8 or more, unlike a normal hard vinyl chloride pipe having a thermal emissivity of less than 0.8, the amount of heat remaining in the horizontal pipe 20 itself can be reduced. The heat exchange rate between the air in the horizontal pipe 20 and the underground heat can be improved.

  As described above, in order to set the thermal conductivity of the horizontal pulling tube 20 to 0.5 to 3.0 W / m · K and the thermal emissivity to 0.8 or more, heat conduction to the hard vinyl chloride resin. A material having a high rate and a material having a high thermal emissivity may be contained.

  The material to be included for improving the thermal conductivity of the horizontal pipe 20 is not particularly limited, and examples thereof include metals such as iron, tin, zinc, gold, copper, silver, chromium, titanium, and magnesium, These oxides, inorganic materials such as alumina and silicon nitride, carbon graphite, and the like can be used alone or in combination.

  The shape of the inclusion that increases the thermal conductivity is not particularly limited, and examples thereof include a granular shape and a needle-like shape.

  When the granular inclusions are contained in the hard vinyl chloride resin, the inclusions have a sea-island structure in the hard vinyl chloride resin, and the respective contents are separated in the hard vinyl chloride resin. Often becomes. In that case, since the heat conduction through the inclusions becomes insufficient, the effect of improving the thermal conductivity of the horizontal draw tube 20 is reduced even if a material having a high thermal conductivity is contained.

  In such a case, it is preferable to mix a granular material and an acicular material in the hard vinyl chloride resin. As a result, even if the granular inclusions are in a sea-island structure in the hard vinyl chloride resin and the inclusions are separated from each other, the inclusion of the needle-like inclusions in the granular form of the sea-island structure The needle-like inclusions are connected to each other, and the thermal conductivity of the horizontal pulling tube 20 can be improved without increasing the content of the inclusions so much.

  The content of the inclusion that increases the thermal conductivity in the hard vinyl chloride resin is required to be about 1 to 50 wt% in order to achieve the thermal conductivity. In view of the performance and moldability, the content is preferably 3 to 33 wt%, and more preferably 3 to 20 wt%.

  In addition, the material to be included for improving the thermal emissivity of the horizontal pipe 20 is not particularly limited. For example, silicon oxide, titanium oxide, manganese oxide, sodium silicate, silicon carbide, carbon black, oxidation Examples thereof include magnesium and natural serpentine.

  Here, among the materials for improving the thermal emissivity described above, it is not possible to improve the above-described thermal conductivity even if it is contained in a hard vinyl chloride resin other than magnesium oxide, and further, the thermal conductivity is lowered. Therefore, it is important to adjust the contents of the material that improves the thermal emissivity and the material that improves the thermal conductivity.

  The shape of the inclusion that increases the emissivity is not particularly limited, and examples thereof include a granular shape and a needle shape.

  If the content of the inclusion that increases the emissivity in the hard vinyl chloride resin is too small, the effect of increasing the emissivity is small, and if it is too large, the moldability deteriorates, so it is preferable to be about 1 to 33 wt%. Furthermore, it is preferable to set it as about 3-20 wt%.

  In addition, various viscosity modifiers and surfactants may be added to the hard vinyl chloride resin to improve moldability.

  Further, a material having an additional function may be added to the hard vinyl chloride resin. Examples of such a material include an ultraviolet absorber, a lubricant, an antistatic agent, a light resistance improving agent, a flame retardant, and a dew condensation preventing agent. , Fillers, colorants, reinforcing agents, fibers and the like.

  The method for forming the horizontal pipe 20 is not particularly limited. For example, after molding a cylindrical body of hard vinyl chloride resin by extrusion molding, the corrugating machine is formed on the outer peripheral surface of the cylindrical body before the resin solidifies. And a method of forming the annular rib 21 and a method of forming the final shape of the horizontal draw tube 20 at once by hollow molding, rotational molding, injection molding, and the like.

  The inner diameter of the horizontal pipe 20 is not particularly limited, and is preferably 100 to 300 mm, for example. When the inner diameter of the horizontal pulling tube 20 is 100 mm or less, when the air speed in the horizontal pulling tube 20 is controlled by the air blowing means 51 described later, the air blowing amount of the air blowing means 51 is adjusted slightly, Since the wind speed in the pipe 20 changes greatly, it becomes difficult to control the wind speed in the horizontal pipe 20. Further, when the inner diameter of the horizontal pulling tube 20 is 300 mm or more, the horizontal pulling tube 20 becomes heavy, which makes it difficult to carry and handle at the construction site, resulting in high construction costs. End up.

  The air blowing means 51 is for introducing outside air into the horizontal pulling tube 20. The air blowing means 51 is not particularly limited, and for example, it is preferable to use a fan that can control the number of rotations. By using such a fan, the wind speed in the horizontal draw pipe 20 can be controlled by controlling the rotation speed of the fan. Therefore, the flow velocity of air in the horizontal draw pipe 20 is too high and the heat of the air and the underground heat. There is no such thing as insufficient exchange. Further, when the horizontal pulling tube 20 having an inner diameter in the range of 100 to 300 mm is used, if the air flow rate in the horizontal pulling tube 20 is controlled to be 12 m / s or less by the blowing means 51, the horizontal pulling is performed. Heat exchange between the air in the pipe 20 and the underground heat can be performed satisfactorily.

As shown in FIG. 3, the horizontal pulling pipe 20 is embedded so as to be inclined downward toward the vertical shaft 30 provided in the middle of the route, and the horizontal pulling pipe 20 is exposed to a portion exposed in the vertical shaft 30 . May be one in which pores are provided and the inside of the horizontal pulling tube 20 is set to a positive pressure so that water condensed on the inner wall of the horizontal pulling tube 20 is discharged from the fine pores into the vertical holes.

In this case, since the horizontal pipe 20 is embedded so as to be inclined downward toward the vertical shaft 30 provided in the middle of the route, high-temperature and high-humidity outside air such as summertime is exchanged in the horizontal pipe 20 by heat exchange. Even if cooled and condensed on the inner wall of the horizontal pipe 20, the condensed water flows toward the shaft 30 . And since the pore is provided in the part exposed in the shaft 30 in the horizontal draw pipe 20 and the inside of the horizontal draw pipe 20 is set to a positive pressure, the water that has reached the position of the vertical shaft 30 in the horizontal draw pipe 20 is removed. It can discharge | emit into the shaft 30 from a pore.

  Therefore, the condensed water does not stay in the horizontal pulling tube 20, so that there is no possibility that various germs such as mold occur in the horizontal pulling tube 20, and a large amount of water accumulates in the horizontal pulling tube 20. Thus, the ventilation in the horizontal pulling tube 20 is not hindered.

Although it does not specifically limit as the said shaft 30 , Although a concrete manhole etc. are used, for example.

A portion of the horizontal pulling tube 20 exposed in the shaft 30 may be a tube having an annular rib 21 formed on the outer peripheral surface, or may be a normal cylindrical tube.

In addition, it is preferable that a large number of pores provided in the exposed portion of the horizontal pulling pipe 20 in the shaft 30 are provided below the horizontal pulling pipe 20.

  The opening diameter of the pores is preferably 5 to 25 mm, and more preferably 7 to 15 mm. By setting the opening diameter of the pores in such a range, an air volume of about 0.01 to 5% of the total blowing volume of the blowing means 51 is discharged from the pores. As a result, the opening diameter of the pores and the air volume from the pores are not so large that the air exchanged from the horizontal pulling tube 20 leaks too much, and the cooling / heating efficiency of the room 40 is not deteriorated. Thus, water is not sufficiently discharged from the pores of the horizontal pulling tube 20.

Further, a pumping means 31 for pumping up the water stored in the vertical shaft 30 and a water supply means 32 for supplying the water pumped up by the pumping means 31 to the soil covering the horizontal pipe 20 may be provided.

  In this case, since the water in the vertical hole pumped up by the pumping means 31 is supplied to the soil covering the horizontal pipe 20 by the water supply means 32, the thermal conductivity of the soil around the horizontal pipe 20 is increased. be able to. Accordingly, since more earth underground heat around the horizontal pipe 20 can be transmitted to the horizontal pipe 20, the heat exchange rate between the air in the horizontal pipe 20 and the underground heat can be improved. it can.

  A general-purpose pump can be used as the pumping means 31, and the pump is not particularly limited. For example, the pump can automatically detect the water level in the shaft 24 and pump water automatically. Is preferably used.

  The water supply means 32 is not particularly limited, and for example, a sprinkler or a cylindrical tube having a fine hole can be used.

  Here, when the ground 50 immediately above the horizontal pipe 20 is soil or the like, water is supplied to the ground 50 by spraying water supplied from the water supply means 32 to the ground covering the horizontal pipe 20. However, when the ground 50 directly above the horizontal pipe 20 is made of concrete or the like, the water does not penetrate to the soil between the horizontal pipe 20 and the ground 50 even if water is sprayed on the ground 50. . In that case, water is supplied to the soil covering the horizontal pipe 20 by providing a water supply means 32 such as a cylindrical pipe having pores in the ground between the ground 50 such as concrete and the horizontal pipe 20. Can do.

  Note that an exhaust pipe from the room 40 may be provided up to the air blowing means 51 to mix the air exhausted from the room 40 and the outside air, and introduce this mixed air into the horizontal pulling pipe 20. Thereby, since the mixed air introduced into the horizontal pulling tube 20 is heated or cooled in advance, the temperature of the air taken into the room 40 after heat exchange can be brought closer to the temperature in the ground. The efficiency of air conditioning can be improved.

  Next, the results of comparison experiments between the geothermal air conditioning system of the present embodiment (Example) and the conventional geothermal air conditioning system (Comparative Example) will be described.

  Table 1 shows each structure of the geothermal air conditioning system 10 of an Example and a comparative example.

ここで、全ての実施例および比較例の地熱利用空調システム１０における共通する構造は、地上に配置した送風手段５１の直下から外気導入管２３を２ｍの深さまで垂直に埋設し、その外気導入管２３の下端に長さ５０ｍの横引き管２０の一端を接続して地中に埋設し、さらに横引き管２０の他端に室内４０給気管２４の下端を接続して垂直に室内４０まで引き込み、その上端を室内機４１に接続している（図１参照）。

Here, the common structure in the geothermal air-conditioning system 10 of all the examples and comparative examples is that the outside air introduction pipe 23 is buried vertically to a depth of 2 m from directly below the air blowing means 51 arranged on the ground, and the outside air introduction pipe. One end of a horizontal pipe 20 having a length of 50 m is connected to the lower end of the pipe 23 and buried in the ground, and the other end of the horizontal pipe 20 is connected to the lower end of the indoor air supply pipe 24 to be pulled vertically into the room 40. The upper end is connected to the indoor unit 41 (see FIG. 1).

  Further, the horizontal pulling tube 20 has an inner diameter of 250 mm in all the examples and comparative examples, and a general-purpose VU tube (rigid polyvinyl chloride thin-walled tube) is used for the outside air introduction tube 23 and the indoor 40 supply tube 24. It was.

  Further, the horizontal pulling tube 20 used in all the examples is made of a hard vinyl chloride resin, and has a plurality of annular ribs 21 formed on the outer peripheral surface at a predetermined interval, and was used in the comparative example. The horizontal pulling tube 20 is a general-purpose VU tube. Among them, in Example 2 and Example 5, the hard vinyl chloride resin contains 10 wt% of alumina having an average particle diameter of 12 μm, 3 wt% of carbon short fibers having a length of 300 μm, and 5 wt% of magnesium oxide. A horizontal tube 20 having a conductivity of 0.6 W / m · K and a thermal emissivity of 0.82 was used.

  Further, as shown in FIG. 1, the geothermal air conditioning systems 10 of Examples 1 and 2 and Comparative Example 1 are embedded so that the horizontal pipe 20 has a downward slope of 10 ‰ from one end side to the other end side. did.

  Further, as shown in FIG. 3, the geothermal air conditioning system 10 of Example 3 and Comparative Example 2 is provided with a shaft 30 having a depth of 3 m and an inner diameter of 900 mm at a position 2 m from the other end of the horizontal pulling pipe 20. The horizontal pulling tube 20 is embedded so as to have a downward slope of 5 ‰ toward the vertical shaft 30. Further, a portion of the horizontal pulling tube 20 exposed in the vertical shaft 30 is provided with pores having an opening diameter of 10 mm. 20 was provided at intervals of 35 mm.

  Further, as shown in FIG. 4, the geothermal air conditioning system 10 according to the fourth and fifth embodiments automatically pumps water by automatically detecting the water level in the shaft 30 of the geothermal air conditioning system 10 according to the third embodiment. The water pumping means 31 capable of generating water is provided, and the pumped water is sprinkled on the ground 50 by the water supply means 32.

  This experiment was conducted for the purpose of cooling the room 40 in the summer using the geothermal air conditioning system 10 of these examples and comparative examples. In addition, as evaluation items in this experiment, the intake air temperature and intake humidity in the blower, the blower temperature and ventilation humidity of the indoor unit 41, the odor in the room 40 (the number of persons who felt odor among 100 subjects), and 24 hours The effect of blowing air due to condensed water after continuous operation was evaluated.

  Table 2 shows the evaluation results of Examples and Comparative Examples in this experiment.

今回の実験において、全ての実施例の地熱利用空調システム１０は、全ての比較例の地熱利用空調システム１０と比較して、室内機４１から送風される空気温度が低くなっており、横引き管２０内での熱交換率が良好であることが確認された。

In this experiment, the geothermal air conditioning system 10 of all the examples has a lower temperature of the air blown from the indoor unit 41 than the geothermal air conditioning system 10 of all the comparative examples, and the horizontal draw pipe It was confirmed that the heat exchange rate within 20 was good.

  In addition, in the geothermal air conditioning system 10 of Examples 3, 4 and 5, the water condensed in the horizontal pipe 20 is discharged to the shaft 24, so there is no odor in the room 40, It was possible to suppress the occurrence of germs such as mold. In the geothermal air conditioning systems 10 of Examples 3, 4 and 5, the amount of air blown from the indoor unit 41 is reduced because the water in the horizontal draw pipe 20 is sufficiently discharged even after continuous operation for 24 hours. Good results were obtained.

It is the schematic which shows the geothermal utilization air conditioning system in this invention. It is a half sectional view showing a horizontal pulling tube in the present invention. It is the schematic which shows the other example of the geothermal utilization air conditioning system in this invention. It is the schematic which shows the further another example of the geothermal utilization air conditioning system in this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Geothermal air-conditioning system 20 Horizontally drawn pipe 21 Annular rib 22 Thin-walled portion 30 Vertical shaft 31 Pumping means 32 Water supplying means 40 Indoor 50 Ground

Claims (3)

The outside air introduction pipe is vertically embedded from the blowing means arranged on the ground, and one end of the horizontal pulling pipe is connected to the lower end of the outside air introduction pipe and buried in the ground, and the other end of the horizontal drawing pipe is vertically buried. Connecting the lower end of the air supply pipe, and connecting the upper end of the air supply pipe to an indoor unit installed on the ground, the outside air that has exchanged heat with the ground heat through the horizontal pulling pipe In the geothermal air conditioning system that cools and heats the room by taking it into the indoor unit,
The horizontal pipe is a cylindrical pipe whose inner surface is made of hard polyvinyl chloride resin, and a plurality of annular ribs are formed on the outer peripheral surface at a predetermined interval, and the thickness of the thin portion without the annular rib is the same inner diameter. 1/2 is formed to 1/4 from the generic cylindrical tube,
The horizontal pipe is embedded so as to have a downward slope toward a shaft provided in the middle of the path, and a portion of the horizontal pipe that is exposed in the shaft is provided with a pore, and the horizontal pipe the pull tube by positive pressure, geothermal air conditioning system, characterized in Rukoto is discharged to the riser bore the water condensation in the lateral pulling pipe wall from the pores. Pumping means for pumping up the water stored in the shaft,
2. A geothermal air conditioning system according to claim 1 , further comprising a water supply means for supplying water pumped up by the pumping means to the soil covering the horizontal pipe. Said lateral pulling tube has a thermal conductivity of a 0.5~3.0W / m · K, and, to claim 1 or claim 2 thermal emissivity is equal to or less than 0.8 The geothermal air conditioning system described.

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