JP2011085271A - Geothermal heat collector and ecologically-friendly air conditioning system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a geothermal heat collector adopted also for standard home due to its simple and inexpensive configuration and having high heat use efficiency and an ecologically-friendly air conditioning system. <P>SOLUTION: The geothermal heat collector 1 includes: a hollow sealed body container 2 embedded in the ground E; and an air flowing pipe line 34 arranged within the body container 2. One end of the air flowing pipe line 34 is connected to an air inflow pipe 16 outside the body container 2, and the other end is connected to an air outflow pipe 18 outside the body container 2. A thermal storage medium 33 including phase change substances 62 having ≥20°C and ≤28°C of phase change temperature generating phase change between a solid phase and a liquid phase is arranged within the body container 2 outside the air flowing pipe line 34. Micro-capsules 63 including the phase change substances 62 may be used for the thermal storage medium 33. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a geothermal heat collector that collects geothermal heat whose temperature does not change significantly throughout the year and sends it to a building on the ground, and an eco-air conditioning system that uses this and is friendly to the global environment.

In recent years, in order to cope with the sick house syndrome that has become a social problem, it has become mandatory to install a 24-hour ventilation system for continuously ventilating indoor air in a house newly constructed after July 1, 2003. This system replaces room air in about 2 hours, and it is said that natural ventilation using natural convection or forced ventilation using a machine may be used.
However, when this room is ventilated using this 24-hour ventilation system, in the summer, warm outside air is taken into the room and the cold air is forced out, and in winter, cold outside air is taken into the room and the warm air is forced out. The energy loss due to is as high as 50% or more, which increases the power consumption. In particular, the system operation in summer leads to global warming, and there is a problem that the amount of cooling energy used increases.

  On the other hand, the summer temperature is 28-35 ° C, the winter temperature is 3-8 ° C, and the underground temperature (underground depth of 3m or more) is 13-15 ° C, which is known to be almost unchanged throughout the year. ing. Therefore, many geothermal utilization devices that use such geothermal heat have been developed, and are described in, for example, Patent Documents 1 to 4 below. The geothermal utilization devices described in these documents provide an air circulation space between a bottomed cylindrical outer tube (heat pile) embedded in the ground with the tube core oriented substantially vertically and an inner wall surface of the outer tube. It is a double pipe type provided with an inner pipe provided in the outer pipe. The lower end of the inner tube is arranged so as to float from the inner bottom surface of the outer tube, and the upper end is open to the air use space of the building. The upper end opening of the outer tube opens to the ground. In the geothermal utilization devices described in these documents, ground air flows from the upper end opening of the outer tube into the space between the outer tube and the inner tube by driving a blower fan or the like and travels toward the inner bottom surface. The air that flows down receives geothermal heat from the ground, cools in the summer and warms in the winter, then flows into the inner pipe and rises. The air rising in the inner pipe exchanges heat with the air flowing down in the air circulation space. As a result, although there is an internal circulation of heat, cooled or heated air is supplied from the upper end of the inner pipe to the air utilization space of the building.

JP 2006-38256 A JP 2003-35455 A Japanese Utility Model Publication No. 57-195030 Japanese Utility Model Publication No. 52-26451

  By the way, the above-mentioned conventional geothermal utilization device has to drive the heat pile deeply into the ground at 10 to 30 m, so that the construction cost becomes as high as 3 to 10 million yen, and it is economically difficult to implement in a general household. there were. Therefore, a housing construction company incorporates geothermal heat under the floor using basic concrete of a house into a 24-hour ventilation system to blow air into the room. However, in such a system using foundation concrete, cold air is sent at the beginning of system operation, but since the foundation concrete is on the ground surface and the heat capacity is small, the geothermal heat received from the surrounding underground cannot catch up and it is close to the outside air. Air of temperature will come out.

  The present invention has been made in view of the above-described conventional problems, and since it has a simple configuration and can be obtained at a low cost, it can be adopted in general households, and a geothermal collector and an eco air conditioning system with high heat utilization efficiency. The purpose is to provide.

  In order to achieve the above object, a geothermal collector according to the present invention comprises a hollow sealed main body container embedded in the ground, and an air circulation pipe disposed in the main body container. The distribution pipe is a geothermal collector in which one end is connected to the air inflow pipe outside the main body container and the other end is connected to the air outflow pipe outside the main body container. A heat storage material including a phase change material having a phase change temperature of 20 ° C. or higher and 28 ° C. or lower causing a phase change between the phase and the liquid phase is provided.

  Examples of the material for the heat storage material that changes in phase include inorganic compounds such as sodium acetate trihydrate and lithium nitrate trihydrate, and organic compounds such as n-paraffin, higher fatty acid, and higher alcohol. Among them, in order to obtain a phase change product in which the phase change temperature causing a phase change between the solid phase and the liquid phase is 20 ° C. or higher and 28 ° C. or lower, which is a “temperature suitable for air conditioning”, for example, the following n-paraffin It is preferred to use a compound.

"Suitable n-paraffin compound";
n-tridecane (C number: 13, melting point: -5 ° C, specific gravity (25 ° C): 0.7559),
n-tetradecane (C number: 14, melting point: 5 ° C., specific gravity (25 ° C.): 0.7624),
n-pentadecane (C number: 15, melting point: 10 ° C., specific gravity (25 ° C.): 0.7689),
n-hexadecane (C number: 16, melting point: 18 ° C., specific gravity (25 ° C.): 0.7734),
n-heptadecane (C number: 17, melting point: 22 ° C., specific gravity (25 ° C.): 0.7770),
n-octadecane (C number: 18, melting point: 28 ° C., specific gravity (25 ° C.): 0.7786),
n-nonadecane (C number: 19, melting point: 33 ° C., specific gravity (25 ° C.): 0.7860),
n-icosane (C number: 20, melting point: 37 ° C., specific gravity (25 ° C.): 0.7890).

  A phase change product having a phase change temperature set as a target can be obtained by appropriately selecting the n-paraffin compound and mixing the mixture in an appropriate ratio to adjust the mixture. For example, when a phase change product having a phase change temperature of 26 ° C. is desired, a mixture in which about 33 wt% of n-heptadecane and about 67 wt% of n-octadecane are mixed may be prepared. By adding n-heptadecane in this way, a melting point drop occurs as seen from n-octadecane having a high melting point. In addition, the heat of fusion of n-tridecane to n-icosane is relatively large at about 180 to 230 KJ / kg.

  And the phase change material prepared as mentioned above can be used by being enclosed in the main body container of the geothermal collector in the form as it is. Further, a large number of small sealed containers filled can be accommodated in the main body container and used. Or it is also possible to use the microcapsule which included said phase change thing as a heat storage material. In particular, in the case of an organic compound, handling is extremely easy if it is used in a microcapsule. Such a microcapsule is known as a fine granular material in which a liquid or solid substance is encapsulated in a synthetic resin shell.

  The method for producing the microcapsules encapsulating the phase change product is not particularly limited, and a conventional method can be used. Examples of such conventional methods include a coacervation method, an in situ method, and an interfacial polymerization method. By these microcapsule production methods, a milky white slurry-like body in which a large number of microcapsules that are spherical microparticles are dispersed in a dispersion medium is obtained, and this slurry-like body may be used as a heat storage material as it is. Alternatively, it is also possible to use a granular material which is an aggregate of only microcapsules obtained by removing the dispersion medium by drying or the like, or a solid material obtained by solidifying the granular material with a binder.

  Further, a sealed bag body containing the slurry-like body as it is may be used as a heat storage material, microcapsule powder obtained by removing water from the slurry-like body, or solidified with a binder. A hermetic bag body containing the solid material obtained by making it into a solid can also be used as a heat storage material.

  Moreover, the eco air conditioning system according to the present invention includes a geothermal heat collector having each configuration described above and a blower fan that sends air to an air inflow pipe connected to the geothermal heat collector. It is configured to send air from the connected air outflow pipe to the building.

  According to the geothermal collector according to the present invention, the main body container buried in the ground, the air circulation pipe arranged in the main body container, and the phase change arranged in the main body container outside the air circulation pipe Since it consists only of a heat storage material containing a thing, the structure is simple and can be provided at low cost. Therefore, the geothermal heat collector of the present invention can be used even in ordinary households. Moreover, geothermal heat can be used for air conditioning on the ground with high heat utilization efficiency by heat storage using the latent heat of the phase change material.

  Further, when the heat storage material is a microcapsule enclosing a phase change product, since the inorganic compound or organic compound constituting the phase change product is enclosed in the capsule shell, it is difficult to undergo alteration such as oxidation. Moreover, since these inorganic compounds and organic compounds are not directly touched, handling is easy.

  When the heat storage material is a slurry-like body in which microcapsules containing phase change substances are dispersed in water, the microcapsules are extremely stable and are easily used in water. Even if the phase change material is a combustible material such as an organic compound, the organic compound is enclosed in the capsule shell, and water is always present around the microcapsule. There is no problem.

  Furthermore, when the heat storage material is a sealed bag body containing microcapsules, it is only necessary to fill a large number of the sealed bag body in the main body container, which makes handling extremely easy.

  As described above, the phase change material encapsulated in the shell of the microcapsule is solidified by releasing the latent heat to the outside by cooling to below the melting point in the capsule, and receiving the latent heat from the outside to melt by heating to above the melting point. To do. That is, as the temperature rises and falls in the surrounding environment across the melting point, solidification and melting are repeated in the capsule shell, and at that time, the latent heat of the remarkably large phase change material is stored or released.

  Further, according to the eco air conditioning system of the present invention, the air cooled or heated by the geothermal heat collector that stores the geothermal heat using the latent heat and sensible heat of the phase change material is driven into the building by the driving of the blower fan. Since it is sent, geothermal heat and heat storage can be used as auxiliary air conditioning in the building, and the energy cost for air conditioning can be reduced. In addition, in the case of a newly-built house, the energy loss by the 24-hour ventilation system can be complemented by using it together with the 24-hour ventilation system that is obligated to install by law.

It is an external view of the geothermal collector which concerns on one Embodiment of this invention. It is a front sectional view of the geothermal heat collector. It is AA arrow sectional drawing in FIG. It is a figure of the graph which shows the temperature change behavior of the phase change material used for the said geothermal collector. It is a schematic block diagram which shows the eco air conditioning system using the said geothermal heat collector. It is a front sectional view of a geothermal collector according to another embodiment of the present invention. It is a front sectional view of a geothermal collector according to another embodiment of the present invention.

Embodiments of the present invention will be described with reference to the drawings. The embodiment described below is merely an example embodying the present invention, and does not limit the technical scope of the present invention. 1 is an external view of a geothermal collector according to an embodiment of the present invention, FIG. 2 is a front sectional view of the geothermal collector, and FIG. 3 is a sectional view taken along line AA in FIG.
In each figure, a geothermal collector 1 according to this embodiment is installed on a hollow hermetic main body container 2 embedded in the underground E and a bottom plate 5 in the main body container 2 that is smaller than the main body container 2. And a hollow hermetically sealed inner container 3. The inner container 3 is arranged with the same drum axis as that of the main body container 2, for example.

  The main body container 2 was diverted from a commercially available stainless steel open drum (a metal drum (all other than packing 9 made of stainless steel), an internal capacity of 420 L, manufactured by Nippon Steel Drum Co., Ltd.). The main body container 2 includes a drum body 4 formed in a cylindrical shape, a bottom plate 5 that seals the bottom opening of the drum body 4, and a lid plate 11 that seals the top opening 38 of the drum body 4 so that it can be opened and closed. It is configured. The outer peripheral edge portion of the bottom plate 5 is co-wound around the entire periphery together with the bottom opening edge of the drum body 4 and is caulked to form an all-around crimping portion 6. The bottom opening of the drum body 4 is sealed by the all-around crimping portion 6. For reinforcement, the drum body 4 has two circumferential protrusions 8 and 8 protruding outward, and the drum body 4 has, for example, twelve fins 13, 13, 13,. -Is fixed by welding at a predetermined interval in the circumferential direction. The welded portion of the fin 13 is shown with a symbol W.

  The opening edge of the upper surface opening 38 of the drum body 4 is wound around to form the entire ring portion 7. A ring plate-shaped packing 9 is placed on the upper surface of the entire ring portion 7. On the packing 9, a fitting recess 10 is formed which is formed to be recessed upward on the entire periphery of the peripheral edge of the disc-shaped lid plate 11. Then, the bolt-shaped band 12 having a ring shape is wound around the fitting recess 10 and the entire ring portion 7. A bolt 21 having a bolt insertion hole is fixed to one end of the bolt-type band 12, and a bolt 22 having a bolt insertion hole is fixed to the other end. These blind hole portions 21 and 22 are arranged to face each other, and the bolt 23 is inserted into the respective bolt insertion holes and screwed with the nut 24, so that the bolt type band 12 connects the fitting recess 10 and the entire ring portion 7. The upper surface opening 38 of the drum body 4 is sealed so as to be openable and closable. A through hole 39 is formed through the peripheral position of the cover plate 11 so as to penetrate therethrough. The air inflow pipe 16 is inserted into the through hole 39 and fixed to the lid plate 11 by welding. A through hole 19 is formed through the cover plate 11 at a position near the peripheral edge on the opposite side of the through hole 39. An air outflow pipe 18 is inserted into the through hole 19 and fixed to the lid plate 11 by welding. The welded portion of the air inflow pipe 16 and the air outflow pipe 18 is indicated with a reference symbol W. An air circulation pipe 34 formed in a coil shape by bending a stainless steel pipe is disposed below the cover plate 11. One end opening of the air circulation pipe 34 is connected to the tip opening of the air inflow pipe 16, and the other end opening of the air circulation pipe 34 is connected to the tip opening of the air outflow pipe 18. Thereby, the cover plate 11, the air circulation pipe 34, the air inflow pipe 16, and the air outflow pipe 18 are integrated.

  As the inner container 3, a commercially available stainless steel closed drum (metal drum (all stainless steel), internal capacity 212L, manufactured by Nippon Steel Drum Co., Ltd.) was diverted. The inner container 3 is mainly composed of a container body 25 formed in a cylindrical shape, a bottom plate 26 that seals the bottom opening of the container body 25, and a lid plate 29 that seals the top opening of the drum body 4. The heat storage material 33 is stored in the inside. The bottom plate 26 seals the bottom opening of the container body 25 from an all-around caulking portion 27 formed by caulking together with the bottom opening edge of the container body 25. The cover plate 29 seals the upper surface opening of the container body 25 from the all-around caulking portion 30 formed by caulking together with the upper surface opening edge of the container body 25. A female screw hole 31 is formed through the cover plate 29, and the female screw hole 31 is sealed by screwing a male screw portion of a cap 32. Further, the container body 25 is formed with two circumferential protrusions 28 and 28 protruding outward for reinforcement.

  As shown in an enlarged circle B in FIG. 2, a slurry-like body 64 as the heat storage material 33 is stored in the inner container 3. In the slurry-like body 64, microcapsules 63 in which a phase change product 62 is enclosed in a capsule shell 61 are dispersed in water 60. The slurry-like body 64 is a white turbid liquid having a solid concentration of about 40 wt% constituting the microcapsule shell. The particle size of the microcapsules 63 in the slurry-like body 64 is about 5 to 20 μm. This slurry-like body 64 is a very stable liquid material containing a dispersant that does not cause aggregation between the microcapsules 63 and 63 even when the phase change material 62 in the shell is repeatedly melted and solidified many times. The heat storage material stored in the inner container 3 is replaced with the slurry-like body 64, and by drying and removing the water 60 from the slurry-like body 64, a myriad of microcapsules 63, 63, 63,. .. A granular material made of fine particles may be used. The phase change material 62 exemplified here is, for example, a mixture of 33 wt% of n-heptadecane and 67 wt% of n-octadecane, and the phase change temperature of this mixture is about 26 ° C.

  Next, the operation of the geothermal collector 1 configured as described above will be described. First, an installation hole having a depth of 1 to 2 m is dug in advance in a planned burial site of the geothermal collector 1 (for example, in the ground of a garden). The main body container 2 with the upper surface opening 38 opened is carried and installed in this installation hole. Next, after filling the heat storage material 33 from the female screw hole 31 of the inner container 3 to fill the ninth minute in the drum, the air in the inner container 3 is replaced with nitrogen gas. Thereafter, the female screw hole 31 is screwed with a cap 32 to seal the inner container 3. The inner container 3 is placed in the main body container 2 and installed on the bottom plate 5. Subsequently, after injecting a predetermined amount of water 17 into the drum body 4, nitrogen gas is bubbled into the water 17. The water 17 contains an appropriate amount of antifreeze, antifungal agent, preservative, and rust inhibitor. Next, the packing 9 is placed on the entire peripheral ring portion 7 of the main body container 2. Then, the air circulation pipe 34 integrated with the cover plate 11 is inserted into the drum main body 4 from the upper surface opening 38 of the main body container 2 and disposed outside the inner container 3. Then, the fitting recess 10 of the cover plate 11 is placed on the packing 9. In this way, when the lid plate 11 is installed in the upper surface opening 38 of the main body container 2, the injection amount of the water 17 is determined so that the water level of the water 17 is about the ninth minute in the drum main body 4. . Then, the bolt-type band 12 is applied around the fitting recess 10 and the entire ring portion 7, and the bolts 23 are passed through the bolt holes 23 and 22 and screwed with the nuts 24. Thereby, the upper surface opening 38 of the main body container 2 is sealed. If necessary thereafter, the upper surface opening 38 of the main body container 2 can be opened again by loosening the nut 24, and maintenance in the geothermal heat collector 1 can be performed.

  Thus, by adopting a configuration that allows opening and closing of the upper surface opening 38 of the drum body 4 of the main body container 2, the main body container 2, the inner container 3, and the heat storage material 33 are transported to the installation site, and the heat storage material 33 is It can be filled on site, and then the upper surface opening 38 is sealed with the lid plate 11.

  The geothermal collector 1 described above is embedded in advance at a depth of 1 to 2 m in the shallow layer of the underground E, and a blower fan (not shown here) is connected to the air inflow pipe 16 or the air outflow pipe 18, for example. The terminal end side of the air outflow pipe 18 is open to the air utilization space in the building. The geothermal heat of the underground E is taken into the main body container 2 from the fins 13, 13, 13,. The geothermal heat taken into the main body container 2 is taken into the inner container 3 through the water 17 from the inner peripheral surface 4 a of the drum main body 4. The geothermal heat taken into the inner container 3 is stored in the heat storage material 33 as latent heat and sensible heat. At this time, for example, in the case of summer, the temperature of the phase change material 62 of the heat storage material 33 is equal to or higher than the phase change temperature M (for example, 26 ° C., see FIG. 4), and the entire amount is melted. Therefore, the temperature of the phase change material 62 behaves along the time direction of the arrow S shown in FIG. That is, when the temperature of the phase change material 62 decreases and reaches the phase change temperature M due to cold geothermal heat, the phase change material 62 releases latent heat and starts to solidify. The phase change material 62 is held at the phase change temperature M until the entire amount is solidified. When the phase change product 62 is completely solidified, the temperature is lowered again. In this manner, cold heat is stored for latent heat and sensible heat.

  Thus, when using the above-described heat storage, the blower fan is driven. By driving the blower fan, outside air or air under the floor of the building is sent to the air inflow pipe 16 and flows into the air circulation pipe 34. The air flowing into the air circulation pipe 34 is stored in the heat storage material 33 in the inner container 3 and the geothermal heat from the inner peripheral surface 4a of the drum body 4 through the water 17 in the drum body 4 while circulating in the pipe. In response to the latent heat and sensible heat, the summer is cooled.

At this time, the temperature of the phase change material 62 behaves along the time direction of the arrow R shown in FIG. That is, by cooling the air in the air circulation pipe 34, when the temperature of the phase change product 62 rises and reaches the phase change temperature M, the phase change product 62 absorbs heat from the air as latent heat and starts to melt. . The phase change material 62 is held at the phase change temperature M until the entire amount is melted. When the entire amount of the phase change material 62 is melted, the temperature rises again. In this way, the stored heat of cold is consumed.
As described above, the phase change product 62 contained in the microcapsule 63 is solidified by releasing latent heat to the outside by cooling to the melting point or lower, and melts by receiving the latent heat from the outside by heating to the melting point or higher. That is, as the ambient temperature rises and falls across the melting point, solidification and melting are repeated in the capsule shell, and at that time, the latent heat of the remarkably large phase change material is stored or released.
In winter, geothermal heat transmitted from the drum body 4 and sensible heat stored in the heat storage material 33 are used to heat the air in the air circulation pipe 34. However, since the heat storage material 33 does not become the phase change temperature M (for example, 26 ° C.) or higher, the latent heat of the heat storage material 33 is not used.

  The air which received geothermal heat and heat storage as described above flows out from the air circulation pipe 34 to the air outflow pipe 18 and is supplied to the air use space in the building. In addition, since the embedment depth of the geothermal heat collector 1 is 2 to 3 m, the soil temperature at that depth is about 20 to 23 ° C. in the summer and about 10 to 15 ° C. in the winter.

  As described above, the geothermal collector 1 of this embodiment is composed only of the main body container 2 with the air circulation pipe 34, the small inner container 3, and the heat storage material 33, so the configuration is simple. Can be provided at low cost. In addition, since the structure itself is simple with the absence of moving parts, almost no maintenance is required. Incidentally, since it is extremely difficult for a person to enter the floor under a space height of only about 20 cm after the completion of the residential building, it is very important that the equipment under the floor and underground are maintenance-free. And since the geothermal heat collector 1 uses especially the latent heat stored in the heat storage material 33, the heat utilization efficiency is remarkably higher than the conventional structure which receives only the sensible heat from the basic concrete part of the building 40. Moreover, since the stainless steel drum which comprises the main body container 2 and the inner container 3 used for the geothermal collector 1 is marketed, it can be obtained easily and cheaply, and the drum size is also in the manufacturer's stock range. Can be selected freely.

  Here, the eco air conditioning system according to the present embodiment is shown in FIG. This eco air conditioning system F has a configuration in which two geothermal collectors 1, 1 embedded in the underground E and a 24-hour ventilation system G are combined. The 24-hour ventilation system G connects a distribution box 43 that is installed in a building 40 such as a house and distributes air, and one air outflow pipe 18 of the geothermal heat collector 1 and the air inflow side of the distribution box 43. An air supply pipe 42 with an electromagnetic open / close valve 56, an intake pipe 55 with an electromagnetic open / close valve 54 connected to the air inflow side of the distribution box 43 to suck the air behind the cabin, and a plurality of air use spaces, respectively. , And the air supply pipes 47, 47, which connect the air supply ports 48, 48, 48... And the air outflow side of the distribution box 43, respectively. .., For example, a blower fan 44 that is disposed in the distribution box 43 and sucks air from the air supply pipe 42 and sends it to the air supply pipes 47, 47, 47... 45 and the control target value of the controller 45 externally A remote controller 46 for displaying the detected temperature or setting conditions for each spatial or al setting input, is mainly composed of the local fan 53 for the part of the air utilization space delivering air from the distribution box 43.

  Examples of the air use space in the building 40 include a living room, a hall, a kitchen, an atrium, a Western-style room, a Japanese-style room, a toilet, a washroom, and a hut. An exhaust port 49 is provided in every air use space. The building 40 is provided with ventilation openings 50, 50 penetrating the wall surface, and the kitchen is provided with a ventilation opening 51 penetrating the wall surface. A ventilation fan 52 is installed in the ventilation port 51. And the above-mentioned two geothermal collectors 1 and 1 are connected in series. That is, the air outflow pipe 18 of one geothermal heat collector 1 is connected to the air inflow pipe 16 of the other geothermal heat collector 1, and the air inflow pipe 16 of the other geothermal heat collector 1 is connected to the 24 hour ventilation system G. The air pipe 42 is connected.

  Since the 24-hour ventilation system G must be driven at all times, when the geothermal heat collectors 1 and 1 are not used, the controller 45 closes the electromagnetic open / close valve 56 and opens the electromagnetic open / close valve 54. The air behind the cabin is sucked from the intake pipe 55 by the blower fan 44 and supplied to each chamber. On the other hand, when using the heat storage of the geothermal heat collectors 1 and 1, the electromagnetic on-off valve 56 is opened and the electromagnetic on-off valve 54 is closed. In that case, outside air is sucked from the air intake port 41 of the first geothermal heat collector 1 disposed on the upstream side and sent to the air inflow pipe 16. After the air flowing into the first geothermal collector 1 from the air inflow pipe 16 is cooled or heated by receiving geothermal heat and heat storage in the main body container 2 and the inner container 3 as described in detail above, The second geothermal heat collector 1 is further cooled or heated by receiving geothermal heat and heat storage. The air flowing out from the air outflow pipe 18 of the second geothermal collector 1 is sent into the distribution box 42 through the air supply pipe 42, and then through the air supply pipes 47, 47, 47,. , 48, 48, 48,... A part of the air in the distribution box 42 is supplied to the living room by driving the local fan 53. Air that has cooled or heated each air use space is discharged from the respective exhaust port 49 to the discharge passage in the building 40 and further discharged from the ventilation port 50 to the outside of the building.

As described above, according to the eco air conditioning system F, the 24-hour ventilation system G and the geothermal heat collectors 1 and 1 on which installation obligations are imposed can be suitably used together. Thereby, the energy loss by a 24-hour ventilation system can be supplemented, and ventilation can be performed without greatly changing the indoor temperature. In particular, in summer, it can be done by dehumidifying operation of the air conditioner, and in winter, it can be done with less heating energy. . As a result, it can contribute to the achievement of a 25% reduction in CO ₂ generation, which is the target of Japan, compared to the 1990 level.

  In addition, since the geothermal collector 1 of this embodiment has a small outer diameter and height of 2 m or less, it is as easy to handle as a septic tank or simpler than a septic tank for general-purpose housing foundation construction. Since it can be easily embedded in a parking lot or in the ground E of a garden using a machine, there is no high construction cost. Further, the number of buried radiants of the geothermal heat collector 1 can be increased according to the required heat exchange amount. When using a plurality of geothermal collectors 1 in this way, the geothermal collectors 1 may be connected in series or in parallel. Since each geothermal collector 1 has a simple configuration and is inexpensive, even if a plurality of geothermal collectors 1 are used, the price of the device itself is lower than that of a conventional heat pile type geothermal heat utilization device. In addition, initial costs such as burial work costs are low, and the construction work is not time-consuming.

In the above embodiment, an example in which the heat storage material 33 made of the slurry-like body 64 including the microcapsules 63 is directly accommodated in the inner container 3 is shown. However, as shown in FIG. , 65, 65,... Is also included in the present invention. As shown in an enlarged circle C in FIG. 6, the sealed bag body 65 accommodates the powder particles of the microcapsule 63, and the bag itself is made of a thick aluminum foil or a synthetic resin sheet. In addition, as a heat storage material of this invention, the airtight bag body which accommodated the slurry-like body 64 containing the microcapsule 63 may be sufficient.
According to this geothermal heat collector 1A, a large number of sealed bags 65 of the heat storage material 33A can be held with bare hands and filled into the inner container 3, so that handling is extremely easy. Further, since the sealed bag body 65 itself can use commercially available products such as a polyethylene bag, a polypropylene bag, and an aluminum foil bag, there is an advantage that it is easily available and easy to use.

  Moreover, although the example which installs the inner container 3 in the main body container 2 and accommodates the heat storage materials 33 and 33A in the inner container 3 is shown above, the inner container 3 is omitted as shown in FIG. A geothermal heat collector 1B in which the slurry-like body 64 is directly accommodated in the main body container 2 as the heat storage material 33 is also included in the present invention.

According to the geothermal heat collector 1B, the slurry-like body 64 accommodated in the main body container 2 can be passed from the air circulation pipe 34 and the inner peripheral surface 4a of the drum container 4 without passing through the water 17 or the inner container 3. Can receive heat directly or dissipate heat. Therefore, it can be said that the geothermal collector 1B has extremely high heat utilization efficiency and the simplest structure. Even in such a configuration, the phase change product 62 is sealed in the capsule shell 61 of the microcapsule 63, and the water 60 is always present around the microcapsule 63. Does not occur.
In place of the slurry-like body 64 described above, a sealed bag body 65 containing the powder of the microcapsule 63 and a sealed bag body containing the slurry-like body 64 containing the microcapsule 63 are directly connected to the main body container 2. A geothermal collector accommodated in the apparatus is also included in the present invention.

  In the above description, the air circulation pipe 34 provided in the main body container 2 is made of a stainless steel pipe. Instead, for example, another metal pipe such as an aluminum pipe or a copper pipe is used as the air circulation pipe. A road may be constructed. Alternatively, the air circulation pipe can be constituted by a synthetic resin pipe, and in that case, an extremely inexpensive air circulation pipe can be provided. In particular, when a pipe made of a thermoplastic synthetic resin such as polyvinyl chloride is used, a helical air circulation pipe can be easily manufactured by heat treatment using a burner or the like.

  Further, in the above, the phase change material having a phase change temperature of 26 ° C. was used as a summer phase latent heat-utilized phase change material. Thus, a phase change temperature of, for example, 13 ° C. can be used as a phase change product utilizing winter latent heat.

  In the above description, a commercially available stainless steel drum is used as the main body container and the inner container. However, the main body container and the inner container according to the present invention are not limited to the commercially available drums, and may be, for example, independently manufactured or cylindrical ones. It doesn't have to be. Further, the metal drum is not limited to a stainless steel drum, and may be a copper drum, a brass drum, an aluminum drum, or the like. Alternatively, an iron drum can be used when the durability, that is, the corrosion resistance is not emphasized.

The building to which the present invention is applied is not limited to a house, and can be applied to, for example, an office building, a factory, a temporary office, an agricultural vinyl house, and the like. In particular, when used in an agricultural vinyl house, it leads to a reduction in fuel for air conditioning, so that high quality crops can be produced at low cost.
In addition, if a site where the geothermal collectors 1 and 1 can be embedded outdoors cannot be secured, the geothermal collectors 1 and 1 may be embedded in the underground E below the floor indicated by a two-dot chain line in FIG. I do not care. In that case, the geothermal heat collector 1 cannot be maintained after the completion of the building 40, but the surface above the geothermal heat collector 1 is always in the shade of the building 40. Become.

1, 1A, 1B Geothermal collector 2 Main body container 16 Air inflow pipe 18 Air outflow pipe 33, 33A Heat storage material 34 Air distribution pipe 40 Building 44 Blower fan 47 Air supply pipe 60 Water 62 Phase change 63 Microcapsule 64 Slurry State body 65 Sealed bag E Underground F Eco air conditioning system G 24-hour ventilation system M Phase change temperature

Claims (5)

A hollow hermetically sealed main body container buried in the ground and an air circulation pipe arranged in the main body container, one end of which is connected to an air inflow pipe outside the main body container and the other end Is a geothermal collector connected to the air outflow pipe outside the main body container,
A heat storage material including a phase change material having a phase change temperature of 20 ° C. or higher and 28 ° C. or lower that causes a phase change between a solid phase and a liquid phase is disposed in a main body container outside the air circulation pipe. Geothermal collector. The geothermal heat collector according to claim 1, wherein the heat storage material is a microcapsule containing a phase change material. The geothermal heat collector according to claim 1, wherein the heat storage material is a slurry-like body in which microcapsules enclosing the phase change material are dispersed in water. The geothermal heat collector according to claim 2 or 3, wherein the heat storage material is a sealed bag body containing microcapsules. A geothermal heat collector according to any one of claims 1 to 4 and a blower fan that sends air to an air inflow pipe connected to the geothermal heat collector. An eco air conditioning system characterized in that the air from the connected air outflow pipe is sent to the building.

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