JP6495023B2 - Geothermal utilization system - Google Patents

Description

  The present invention relates to a geothermal heat utilization system that utilizes geothermal heat whose temperature is relatively stable throughout the year for air conditioning or the like via a heat pump device.

  Conventionally, in this type, a plurality of buried pipes buried in the ground, heat exchange pipes arranged in the buried pipes for heat exchange while circulating a heat medium, and heat exchange pipes are connected to heat. A horizontal pipe that circulates the medium, and a buried pipe in which a heat exchange pipe is arranged so that the heat medium is circulated across the plurality of buried pipes is connected in series by the horizontal pipe, and is connected to the heat pump device. There was a geothermal utilization facility that circulated a heat medium and used the underground heat as a heat source. (For example, refer to Patent Document 1.)

Japanese Patent No. 4632760

  By the way, this conventional one is considered to install a plurality of buried pipes at the lower part of the site such as a parking lot other than under the house or under the house, and when installing a plurality of buried pipes, Installed at a large interval so that the influence of changes in underground temperature when heat exchange between the heat transfer medium circulating in the heat exchange pipe placed in the buried pipe and the underground does not reach the adjacent buried pipe It is desirable to do.

  However, if buried pipes can be installed only in a limited space due to restrictions on the site area or to reduce the construction area of the buried pipes, the buried pipes should be spaced sufficiently apart. It becomes difficult to install.

  Such a case will be described with reference to FIG. FIG. 6 is a schematic plan view (corresponding to FIG. 1 of Patent Document 1) for explaining the schematic configuration of the conventional geothermal utilization facility and the underground condition, 101 is a heat pump device, and 102 (102a to 102f) are underground. A plurality of buried pipes 103 (103a to 103f) are arranged in the buried pipe 102 for heat exchange while circulating the heat medium, and 104 is connected to the heat exchange pipe 103 to connect the heat medium. This is a horizontal pipe for circulation.

  When the heat pump device 101 is driven, for example, heating operation is continuously performed, and heat collection from the ground is continued by heat exchange between the heat medium circulating in the heat exchanging pipe 103 and the ground, the time elapses. Along with this, the region S where the temperature in the ground changes circularly around each buried pipe 102 becomes larger. The size of the region S differs depending on each buried pipe 102, and in the buried pipe 102a in which the heat exchange pipe 103a into which the coldest heat medium flowing out from the heat pump device 101 first flows is arranged, the heat exchange pipe The temperature difference between the heat medium that circulates through 103a and the underground is the largest compared to the temperature difference between the heat medium that circulates through the other heat exchange pipes 103b to 103f and the underground, and the amount of heat collected is large. The area Sa in which the temperature of the ground spreading around 102a changes is large, and the temperature drop in the ground is also large. On the other hand, in the buried pipe 102f in which the heat exchange pipe 103f through which the heat medium having passed through the first to fifth heat exchange pipes 103 and passed through the heat exchange with the ground and finally circulated is disposed, The temperature difference between the heat medium flowing through the replacement pipe 103f and the ground is the smallest compared to the temperature difference between the heat medium flowing through the other heat exchange pipes 103a to 103e and the ground, and the amount of heat collected is also small. The region Sf where the underground temperature changes around the buried pipe 102f is small, and the underground temperature drop is small.

  Here, it is difficult to install the buried pipes 102 at a sufficient interval. As shown in FIG. 6, the heat exchange pipe 103 a into which the heat medium flowing out from the heat pump device 101 flows first (first) is provided. When the buried pipe 102a and the buried pipe 102f having the heat exchange pipe 103f through which the heat medium flows last (sixth) are installed adjacent to each other, the region Sa and the buried pipe centering on the buried pipe 102a The region Sf centered at 102f overlaps at the portion indicated by the oblique lines, and there is a problem in that the amount of heat collected decreases due to thermal interference due to the influence of the underground temperature change on the other side. More specifically, since the temperature range in the ground is greatly different between the surrounding of the buried pipe 102a and the surrounding of the buried pipe 102f, the temperature of the buried pipe 102a is low and the temperature of the buried pipe 102f is high in the ground. A temperature gradient is generated, and the underground heat around the buried pipe 102f is likely to be pulled to the buried pipe 102a side by thermal interference, resulting in a decrease in the amount of heat collected in the buried pipe 102f. The temperature of the heat medium returned to 101 also becomes low, and the efficiency of the heat pump device 101 may be deteriorated.

In order to solve the above-mentioned problems, the present invention provides a heat pump device that uses geothermal heat in soil as a heat source, a plurality of buried pipes buried in the soil, and the buried pipes. Connect the underground heat exchange pipe that circulates the heat medium inside and the adjacent underground heat exchange pipes among the underground heat exchange pipes, or connect the underground heat exchange pipe and the heat pump device inside, A horizontal pipe that circulates the heat medium, and the underground heat exchange pipe is circulated in turn to the underground heat exchange pipes disposed in the plurality of buried pipes. The heating medium that is connected in series with a horizontal pipe and flows out of the heat pump device flows in order from the first underground heat exchange pipe to the last underground heat exchange pipe, and finally the underground heat exchange. Out of the pipe As the back to the heat pump device after, the heating medium to circulate in the heat pump apparatus, the temperature of the heating medium that flows through each of the geothermal heat exchanger pipe which is disposed each embedded tube is different In the underground heat utilization system, the embedded pipes adjacent to each other in the upstream and downstream relationship with respect to the flow of the heat medium are installed with a certain interval, and thermal interference occurs between the adjacent embedded pipes. In a limited space within a predetermined range that can be generated, the plurality of buried pipes are arranged in a plurality of rows so that the influence of thermal interference between the buried pipes is reduced and the soil is viewed from the direction of the buried pipes. The buried pipe in which the underground heat exchange pipe through which the heat medium flowing out from the heat pump device flows first and the underground heat exchange pipe through which the heat medium flows secondly are installed. Arranged The buried pipe is installed at a position far from the heat pump device in terms of distance compared to other buried pipes, and the buried pipe in which the underground heat exchange pipe through which the heat medium flows last is disposed and from the last. Secondly, the buried pipe in which the underground heat exchange pipe through which the heat medium circulates is disposed is installed at a position closer to the heat pump device in terms of distance compared to other buried pipes, and flows out of the heat pump device. An interval between the buried pipe in which the underground heat exchange pipe through which the heat medium flows first is disposed and the buried pipe in which the underground heat exchange pipe through which the heat medium flows last is disposed, It was assumed to be larger than the predetermined interval.

  Moreover, in Claim 2, the said underground pipe | tube in which the said underground heat exchange pipe through which the said heat medium which flowed out from the said heat pump apparatus distribute | circulates was arrange | positioned, and the said earth where the said heat medium distribute | circulates from the last are provided. The distance from the buried pipe provided with the intermediate heat exchange pipe is set to be larger than the predetermined distance.

  Moreover, in Claim 3, the said underground heat | fever which the said heat medium distribute | circulates the said underground pipe | tube with which the said underground heat exchange pipe by which the said heat medium which flowed out from the said heat pump distribute | circulated 2nd was arrange | positioned was arrange | positioned lastly An interval between the replacement pipe and the buried pipe is set to be larger than the predetermined interval.

  Further, in claim 4, the buried pipe in which the underground heat exchange pipe in which the heat medium flowing out from the heat pump device is circulated second is disposed, and the heat medium is circulated second to last. The distance from the buried pipe provided with the underground heat exchange pipe is set to be larger than the predetermined distance.

  Further, in claim 5, the buried pipe is composed of five pieces, and the buried pipe provided with the underground heat exchange pipe through which the heat medium flows in the third order in the flow order of the heat medium, It was assumed that it was not installed at a position surrounded by the buried pipe.

According to the first aspect of the present invention, the underground heat exchange pipes are connected in series by the horizontal pipes so that the heat medium is circulated in turn to the underground heat exchange pipes respectively disposed in the plurality of buried pipes. The heat medium flowing out from the heat pump device flows in order from the first underground heat exchange pipe to the last underground heat exchange pipe, and then returned to the heat pump device after flowing out from the last underground heat exchange pipe. The heat medium is circulated through the heat pump device, and the temperature of the heat medium flowing through each underground heat exchange pipe disposed in each buried pipe is different from that upstream of the flow of the heat medium. And the buried pipes adjacent to each other in a downstream relationship with each other, and the buried pipes in a limited space within a predetermined range in which thermal interference may occur between the neighboring buried pipes. Thermal interference between tubes Influence the plurality of buried pipe to be smaller, as viewing the soil from buried direction of the buried pipe placed two-dimensionally in a plurality of rows, the heating medium that has flowed out of the heat pump device is initially flows the The buried pipe in which the underground heat exchange pipe is arranged and the buried pipe in which the second underground heat exchange pipe through which the heat medium flows are arranged farther from the heat pump device than the other buried pipes. The buried pipe in which the underground heat exchange pipe through which the heat medium circulates is disposed and the underground heat exchange pipe through which the heat medium circulates from the last are disposed. The buried pipe is installed at a position closer to the heat pump device in terms of distance than other buried pipes, and the underground heat exchange pipe through which the heat medium flowing out from the heat pump device first flows is disposed. The tube and the heating medium When the heating operation is performed with the heat pump device, the distance from the buried pipe in which the underground heat exchange pipe that circulates is disposed is larger than the certain interval. There is a large gap between the buried pipe where the heat medium that has flowed out first flows and the temperature of the surrounding soil drops the most, and the buried pipe where the temperature of the surrounding soil drops the smallest because the heat medium flows last. There is an underground heat exchange pipe through which the heat medium flowing out from the heat pump device first circulates rather than a fixed interval between adjacent buried pipes with respect to the circulating heat medium flow. The distance between the buried pipe and the buried pipe where the underground heat exchange pipe through which the heat medium finally circulates is larger in distance, and the two that have the largest difference in the temperature range in the soil No thermal interference between buried pipes Therefore, it is possible to prevent a decrease in the amount of heat collected due to thermal interference, and to suppress the decrease in the amount of heat collected that can be obtained with the entire buried pipe as much as possible. Furthermore, by installing a plurality of buried pipes two-dimensionally with respect to the soil in a plan view, the plurality of buried pipes are arranged in a straight line with a certain interval between adjacent buried pipes. Compared with the case where it installs, the horizontal pulling pipe which connects a heat pump apparatus and an underground heat exchange pipe can be short, and can suppress cost.

  Moreover, according to claim 2, the buried pipe in which the underground heat exchange pipe through which the heat medium flowing out from the heat pump device first circulates is disposed, and the underground heat exchange pipe in which the heat medium circulates second from the last. When the heating operation is performed with the heat pump device, the heat medium that has flowed out of the heat pump device first circulates and is surrounded by The buried pipe where the temperature of the soil is greatly reduced and the buried pipe where the heat medium circulates second from the end and the temperature of the surrounding soil is lowered the second smallest are installed at a large interval. The buried pipe in which the underground heat exchange pipe through which the heat medium flowing out from the heat pump device first circulates is more than the fixed interval between the buried pipes adjacent to the flow of the heat medium, and the heat medium Is the second to last geothermal heat exchanger The distance from the buried pipe where the pipe is arranged is larger in distance, and no thermal interference occurs between the two buried pipes having a large difference in the temperature range in the soil. A decrease in the amount of heat collected can be prevented.

  Further, according to claim 3, the buried pipe in which the underground heat exchange pipe through which the heat medium flowing out from the heat pump device circulates second is disposed, and the underground heat exchange pipe in which the heat medium circulates last are arranged. When the heating operation is performed with the heat pump device, the heat medium flowing out from the heat pump device circulates secondly and the surrounding soil when the heating pump operation is performed by making the interval with the buried pipe larger than a certain interval. The buried pipe with the second largest drop in temperature and the buried pipe with the lowest temperature of the surrounding soil where the heat medium circulates last are installed with a large gap between them. The buried pipe in which the underground heat exchange pipe through which the heat medium flowing out from the heat pump device circulates second is disposed, and the heat medium is finally at the end, rather than a fixed interval between the buried pipes adjacent to the medium flow. Embedding with circulating underground heat exchange pipes The distance between and is larger in terms of distance, so that there is no thermal interference between the two buried pipes with large differences in the temperature range in the soil, and the reduction of the amount of heat collected due to thermal interference is prevented. It is something that can be done.

  Further, according to claim 4, the buried pipe in which the underground heat exchange pipe through which the heat medium flowing out from the heat pump device circulates is disposed, and the underground heat exchange in which the heat medium circulates second from the last. When the heating pump is used for heating operation, the heat medium flowing out from the heat pump device circulates second because the interval between the pipe and the buried pipe is made larger than a certain interval. There is a large gap between the buried pipe where the temperature of the surrounding soil is the second largest and the buried pipe where the temperature of the surrounding soil is the second smallest and the temperature of the surrounding soil is the second lowest. A buried underground heat exchange pipe through which the heat medium flowing out from the heat pump device circulates second than the fixed interval between the buried pipes adjacent to the flow of the heat medium. The pipe and the heat medium circulate from the last to the second The distance between the underground pipe with the underground heat exchange pipe is larger, and there is no thermal interference between the two underground pipes with a large difference in the temperature range in the soil. It is possible to prevent a decrease in the amount of heat collected due to the above.

  According to claim 5, the buried pipe is composed of five pipes, and the buried pipe provided with the underground heat exchange pipe through which the heat medium flows in the third order in the flow order of the heat medium is the other buried pipe. However, the buried pipe with the underground heat exchange pipe through which the heat medium circulates in the third order in the flow order of the heat medium is located at such a position. When installed in, all the buried pipes collect ground heat in the soil around the buried pipes where the underground heat exchange pipes through which the third heat medium flows are arranged in the order of the flow of the heat medium. Since the amount of heat collected from the soil by the third buried pipe in the order of the flow of the heat medium is extremely reduced, the amount of heat collected from the entire buried pipe is reduced. The buried pipe in which the underground heat exchange pipe through which the heat medium circulates in the third order is arranged is surrounded by other buried pipes. By was prevented from being installed in the location, in which it is possible to suppress adopted it is possible to prevent deterioration of heat, that the adoption heat can be obtained throughout the buried pipe is reduced as much as possible.

The top view of the underground heat utilization system of one Embodiment of this invention. Sectional drawing of the underground heat utilization system of the same embodiment. The schematic plan view explaining the steel pipe pile installation situation of the underground heat utilization system of the same embodiment. The schematic plan view explaining the schematic structure of the underground heat utilization system of the same embodiment, and the underground condition. The schematic plan view explaining the unpreferable steel pipe pile installation situation in the underground heat utilization system of the same embodiment. The schematic plan view explaining the general | schematic structure of the conventional geothermal utilization equipment, and the underground condition.

Next, a ground heat utilization system according to an embodiment of the present invention will be described with reference to the drawings.
1 is a heat pump device that uses ground heat in the soil as a heat source for air conditioning, etc. 2 is a predetermined depth (about 10 m) in the soil in the site of a parking lot or the like under the house 3 or under the house 3 The steel pipe piles 2 (2a to 2e) are buried as vertical pipes in the vertical direction, and a plurality of the steel pipe piles 2 are installed at predetermined intervals.

  In the steel pipe pile 2, geothermal heat composed of a U-shaped cross-linked polyethylene pipe for exchanging heat with the ground heat in the soil while circulating antifreeze as a heat medium circulated from the heat pump device 1. Exchange pipe 4 (4a-4e) is arranged in the vertical direction, and the gap between steel pipe pile 2 and underground heat exchange pipe 4 is filled with grout material 5 such as silica sand or water for promoting heat conduction. Thus, heat is efficiently exchanged between the underground heat in the soil and the heat medium in the underground heat exchange pipe 4.

  6 is buried in the soil and connects the adjacent underground heat exchange pipes 4 or the underground heat exchange pipe 4 and the heat pump device 1 among the underground heat exchange pipes 4 disposed in the steel pipe pile 2. , A horizontal drawing pipe 7 made of a cross-linked polyethylene pipe for circulating a heat medium inside, 7 is provided at a connecting portion between the underground heat exchange pipe 4 and the horizontal drawing pipe 6, and the underground heat exchange pipe 4 and the horizontal drawing pipe 6 The underground heat exchange pipe 4, the horizontal pipe 6 and the joint 7 constitute a ground heat circulation circuit 8 that circulates the heat medium in the heat pump device 1, and includes a plurality of steel pipe piles 2. The underground heat exchange pipe 4 is connected in series by a horizontal pipe 6 so that the heat medium is circulated in turn.

  In the present embodiment, the steel pipe piles 2 are limited to each other in a limited space within a predetermined range (area) because the site area is limited or the construction area of the steel pipe piles 2 is reduced. A plurality of steel pipe piles 2 are installed two-dimensionally in plan view with respect to the soil so that the influence of thermal interference on the steel is minimized. As shown in FIG. The distance between the steel pipe pile 2b and the steel pipe pile 2c is about 1.5m, the distance between the steel pipe pile 2c and the steel pipe pile 2d is about 1.5m, the steel pipe pile 2d and the steel pipe pile 2e, The distance between the steel pipe pile 2a and the steel pipe pile 2e is about 3m, and the steel pipe pile 2a and the steel pipe pile 2b are connected to the other steel pipe piles 2c, 2d, and 2e. Compared with the distance from the heat pump device 1, the steel pipe pile 2d The steel pipe pile 2e is installed at a position closer to the heat pump device 1 in terms of distance compared to the other steel pipe piles 2a, 2b, 2c. In particular, the steel pipe pile 2e is compared to the other steel pipe piles 2a, 2b, 2c, 2d, It is installed at a position closest to the heat pump device 1 in terms of distance.

  Next, when the heating operation is performed by the heat pump device 1, the flow of the heat medium circulating in the underground heat circulation circuit 8 will be described. First, the heat pump is driven by driving a circulation pump (not shown) in the heat pump device 1. It is the underground heat exchange pipe 4a arranged in the steel pipe pile 2a that the coldest heat medium flowing out from the apparatus 1 flows into the first (first) and exchanges heat with the underground heat in the soil. The second heat medium flows in and exchanges heat with the ground heat in the soil is the underground heat exchange pipe 4b disposed in the steel pipe pile 2b, and then the third heat medium flows in the soil. The ground heat exchange pipe 4c arranged in the steel pipe pile 2c exchanges heat with the underground heat inside, and then the fourth (second to last) heat medium flows into the ground in the soil. The heat exchange with the heat is the underground heat exchange pipe 4d arranged in the steel pipe pile 2d. It is the underground heat exchange pipe 4e arranged in the steel pipe pile 2e that the heat medium flows into (fifth) and exchanges with the underground heat in the soil, and the 1st to 5th underground heat exchange. The heat medium heated by the heat exchange in the pipes 4a to 4e is returned to the heat pump device 1 after flowing out from the last (fifth) underground heat exchange pipe 4e.

  Here, the state in the soil when the heating operation is continuously performed by the heat pump device 1 and the heat is continuously collected from the soil will be described with reference to FIG. 4. The heat medium circulating through the underground heat exchange pipe 4 When heat collection is continued from the soil by heat exchange with the ground heat in the soil, the region S (region Sa) in which the temperature in the soil changes in a substantially circular shape around each steel pipe pile 2 with the passage of time. The region Se) becomes larger.

  The size of the region S over time varies depending on each steel pipe pile 2, and has a relationship of region Sa> region Sb> region Sc (not shown)> region Sd> region Se. Among the intermediate heat exchange pipes 4, in the underground heat exchange pipe 4a in which the coldest heat medium flowing out from the heat pump device 1 flows first (first), the heat medium flowing through the underground heat exchange pipe 4a and the soil Is the largest compared to the temperature difference between the heat medium flowing through the other underground heat exchange pipes 4b to 4e and the soil, and the amount of heat collected is also large, so in the soil spreading around the steel pipe pile 2a The region Sa where the temperature changes is large, and the temperature drop in the soil is also large. Moreover, in the underground heat exchange pipe 4b into which the heat medium flows in secondly among the plurality of underground heat exchange pipes 4, the temperature difference between the heat medium flowing through the underground heat exchange pipe 4b and the soil is The temperature difference between the heat medium flowing through the first underground heat exchange pipe 4a and the soil is smaller than the temperature difference between the heat medium flowing through the other underground heat exchange pipes 4c to 4e and the soil. Since it is large and the amount of heat collected is large, the region Sb where the temperature in the soil spreading around the steel pipe pile 2b changes is large, and the temperature drop in the soil is also large.

  On the other hand, among the plurality of underground heat exchange pipes 4, the last (fifth) underground heat exchange pipe 4e in which the heat medium circulates is a heat medium that circulates in the underground heat exchange pipe 4e, that is, four earth heat exchange pipes 4e. The temperature difference between the heat medium that has passed through the intermediate heat exchange pipes 4a to 4d and increased in temperature through heat exchange with the soil, and the temperature difference between the heat medium and the soil that circulates through the other underground heat exchange pipes 4a to 4d Since the temperature difference is the smallest and the amount of heat collected is small compared to the inside, the region Se where the temperature in the soil spreading around the steel pipe pile 2e changes is small, and the temperature drop in the soil is also small. Among the plurality of underground heat exchange pipes 4, the underground heat exchange pipe 4d into which the heat medium flows into the fourth (second to last) is the heat medium flowing through the underground heat exchange pipe 4d and the soil. Is larger than the temperature difference between the heat medium flowing through the last underground heat exchange pipe 4e and the soil, but between the heat medium flowing through the other underground heat exchange pipes 4a to 4c and the soil. Since the temperature difference is smaller and the amount of heat collected is smaller, the region Sd where the temperature in the soil that spreads around the steel pipe pile 2d changes is small, and the temperature drop in the soil is small.

  Here, as shown in FIG. 4, the region Sa and the region Sb overlap each other at a hatched portion, and are affected by changes in the temperature in the soil on the other side, but the steel pipe pile 2 a and the steel pipe The pile 2b has a large amount of heat collected, and the temperature range in the soil is approximately the same or close to the steel pipe pile 2a and the steel pipe pile 2b. Therefore, the steel pipe pile 2a side is low temperature and the steel pipe pile 2b side is high temperature in the soil. Even if a temperature gradient occurs, a decrease in the amount of heat collected from the steel pipe pile 2b due to thermal interference can be kept small.

  Further, as shown in FIG. 4, the steel pipe pile 2a in which the temperature of the surrounding soil is greatly reduced and the steel pipe pile 2e in which the temperature of the surrounding soil is lowest are greatly spaced. Steel pipe piles 2 adjacent to the flow of the heat medium circulating in the underground heat circulation circuit 8 (steel pipe pile 2a and steel pipe pile 2b, or steel pipe pile 2b and steel pipe pile 2c, or steel pipe pile 2c The distance between the steel pipe pile 2a and the steel pipe pile 2e is larger than the constant distance (1.5 m) between the steel pipe pile 2d or the steel pipe pile 2d and the steel pipe pile 2e). Since there is no overlapping part with Se, thermal interference does not occur between the two steel pipe piles 2 (steel pipe pile 2a and steel pipe pile 2e) having the largest temperature difference in the temperature range in the soil. A decrease in the amount of heat collected can be prevented.

  Further, as shown in FIG. 4, the steel pipe pile 2a in which the temperature of the surrounding soil is greatly reduced and the steel pipe pile 2d in which the temperature of the surrounding soil is secondly reduced are large. Steel pipe piles 2 that are installed at intervals and adjacent to the flow of the heat medium circulating in the underground heat circulation circuit 8 (steel pipe pile 2a and steel pipe pile 2b, or steel pipe pile 2b and steel pipe pile 2c, or The distance between the steel pipe pile 2a and the steel pipe pile 2d is greater in distance than the fixed distance (1.5 m) between the steel pipe pile 2c and the steel pipe pile 2d, or the steel pipe pile 2d and the steel pipe pile 2e). Since there is no overlapping portion between Sa and region Sd, thermal interference does not occur between the two steel pipe piles 2 (steel pipe pile 2a and steel pipe pile 2d) having a large difference in the temperature range in the soil. It is possible to prevent a decrease in the amount of heat collected due to the above.

  Moreover, as shown in FIG. 4, the steel pipe pile 2b in which the temperature of the surrounding soil is greatly reduced secondly and the steel pipe pile 2e in which the temperature of the surrounding soil is reduced to the smallest are large. Steel pipe piles 2 that are installed at intervals and adjacent to the flow of the heat medium circulating in the underground heat circulation circuit 8 (steel pipe pile 2a and steel pipe pile 2b, or steel pipe pile 2b and steel pipe pile 2c, or The distance between the steel pipe pile 2b and the steel pipe pile 2e is greater than the fixed distance (1.5 m) between the steel pipe pile 2c and the steel pipe pile 2d, or the steel pipe pile 2d and the steel pipe pile 2e). Since there is no overlapping portion between Sb and region Se, thermal interference does not occur between the two steel pipe piles 2 (steel pipe pile 2b and steel pipe pile 2e) having a large difference in the temperature range in the soil. It is possible to prevent a decrease in the amount of heat collected due to the above.

  Furthermore, as shown in FIG. 4, the steel pipe pile 2b in which the temperature of the surrounding soil is lowered second largest and the steel pipe pile 2d in which the temperature of the surrounding soil is lowered second smallest are The steel pipe piles 2 are installed adjacent to the flow of the heat medium circulating in the underground heat circulation circuit 8 (the steel pipe pile 2a and the steel pipe pile 2b, or the steel pipe pile 2b and the steel pipe pile 2c). Or the distance between the steel pipe pile 2b and the steel pipe pile 2d is larger than the fixed distance (1.5 m) between the steel pipe pile 2c and the steel pipe pile 2d, or the steel pipe pile 2d and the steel pipe pile 2e). Since there is no overlapping portion between the region Sb and the region Sd, no thermal interference occurs between the two steel pipe piles 2 (the steel pipe pile 2b and the steel pipe pile 2d) having a large difference in the temperature range in the soil, A decrease in the amount of heat collected due to heat interference can be prevented.

  As described above, although thermal interference occurs between the steel pipe pile 2a and the steel pipe pile 2b, the temperature range in the soil is almost the same or close to the periphery of the steel pipe pile 2a and the steel pipe pile 2b, so The decrease in the amount of heat collected is small, and otherwise there is no thermal interference where there is a large difference in the temperature range in the soil, and the steel pipe pile 2 in a limited space within a predetermined range (area) The influence of heat interference between each other can be minimized, the decrease in the amount of heat collected due to the heat interference can be prevented, and the amount of heat collected that can be obtained by the steel pipe pile 2 as a whole can be suppressed as much as possible. In addition, since the temperature of the heat medium returned to the heat pump apparatus 1 can be maintained high by suppressing the decrease in the amount of heat collected, the efficiency of the heat pump apparatus 1 can be maintained in a good state.

  Moreover, in this embodiment, in the limited space in a predetermined range (area), the steel pipe piles 2 adjacent to the flow of a heat medium two-dimensionally with respect to the soil two-dimensionally in plan view. Installed at regular intervals. This is because a plurality of steel pipe piles 2 are arranged in a straight line in a plan view with respect to the soil, and the adjacent steel pipe piles 2 are installed at regular intervals with respect to the flow of the heat medium. If it does, there exists a problem that the horizontal drawing pipe 6 which connects the heat pump apparatus 1 and the steel pipe pile 2 will become uselessly long, and having installed two or more steel pipe piles 2a-2e two-dimensionally Therefore, the horizontal pulling pipe 6 connecting the heat pump device 1 and the steel pipe pile 2 can be short, and the cost can be reduced.

  In the present embodiment, a plurality of steel pipe piles 2a to 2e are two-dimensionally installed in a limited space within a predetermined range (area). The installation situation of the pile 2 is demonstrated using FIG. In FIG. 5, the distance between the steel pipe pile 2a and the steel pipe pile 2b is about 1.5 m, the distance between the steel pipe pile 2b and the steel pipe pile 2c is about 1.5 m, and the distance between the steel pipe pile 2c and the steel pipe pile 2d is 1.5 m. The distance between the steel pipe pile 2d and the steel pipe pile 2e is about 1.5m, and the gap between the steel pipe pile 2a and the steel pipe pile 2e is greatly increased, resulting in a large difference in the temperature range in the soil. A plurality of steel pipe piles 2 are two-dimensionally installed while preventing thermal interference between the two steel pipe piles 2 included.

  In the case where the steel pipe pile 2 is installed as shown in FIG. 5, when the heating operation is continuously performed by the heat pump device 1 and the heat is continuously collected from the soil, the underground heat circulation circuit 8 is provided. The steel pipe pile 2c in which the underground heat exchange pipe 4c through which the heat medium circulates in the third order in the flow order of the heat medium circulating is arranged around the other steel pipe piles 2a, 2b, 2d and 2e (four sides) When installed in a position that is surrounded, the steel pipe pile 2c and all the steel pipe piles 2a, 2b, 2d, and 2e collect heat from the underground heat in the soil around the steel pipe pile 2c. In this way, the amount of heat collected by the steel pipe pile 2c from the soil is extremely reduced, and the amount of heat collected by the steel pipe pile 2 as a whole is reduced. Therefore, even when a plurality of steel pipe piles 2 are installed in a two-dimensional manner, by removing the installation method as shown in FIG. It is possible to suppress the reduction in the amount of heat collection that can be obtained as much as possible.

  In addition, this invention is not limited to the said one Embodiment, As shown in FIG. 3, the installation position of the some steel pipe pile 2 installed two-dimensionally with respect to the soil by planar view is shown. Modifications may be made without changing the gist.

  Moreover, in this embodiment, although the steel pipe pile 2 was comprised with five pieces, the steel pipe pile 2 may have more than five pieces, and you may change in the range which does not change the summary of invention.

  Further, in the present embodiment, the method of installing the steel pipe pile 2 of the present invention is applied in the case where the heat pump device 1 performs the heating operation. However, the present invention is applied in the case where the heat pump device 1 can perform the cooling operation or the air conditioning operation. The method of installing the steel pipe pile 2 of the invention may be applied, and the heat pump device 1 performs cooling operation as an example, and the installation status of the steel pipe pile 2 and the flow of the heat medium circulating in the underground heat circulation circuit 8 If it is the same as that of FIG. 4, the content regarding the heat collection from the soil is merely replaced with the content regarding the heat radiation to the soil, and when the heat pump device 1 performs the cooling operation, the heat radiation amount decreases due to the heat interference. It can prevent and can suppress that the heat radiation amount in the steel pipe pile 2 whole reduces.

DESCRIPTION OF SYMBOLS 1 Heat pump apparatus 2 Buried pipe 4 Underground heat exchange pipe 6 Horizontal drawing pipe

Claims (5)

A heat pump device using geothermal heat in the soil as a heat source, a plurality of buried pipes buried in the soil, a ground heat exchange pipe disposed in the buried pipe and circulating a heat medium therein, and the ground The ground heat exchange pipes adjacent to each other among medium heat exchange pipes, or the ground heat exchange pipe and the heat pump device are connected to each other, and a horizontal pulling pipe for circulating the heat medium therein is provided, The underground heat exchange pipe was connected in series with the horizontal pipe so that the heat medium was circulated in turn to the underground heat exchange pipes respectively disposed in the buried pipes, and flowed out of the heat pump device. The heat medium flows in order from the first underground heat exchange pipe to the last underground heat exchange pipe, and is returned to the heat pump device after flowing out from the last underground heat exchange pipe. Said heating medium so as to circulate the heat pump apparatus, at a temperature of the heating medium is different geothermal heat utilization system that flows through each of the geothermal heat exchanger pipe which is disposed each embedded tube, the flow of the heating medium The embedded pipes that are adjacent to each other in an upstream and downstream relationship are installed at a predetermined interval, and a limited space within a predetermined range in which thermal interference can occur between the adjacent embedded pipes. Among these, the plurality of buried pipes are two-dimensionally installed in a plurality of rows while looking at the soil from the direction of burying the buried pipes so that the influence of thermal interference between the buried pipes is reduced, and from the heat pump device The buried pipe in which the underground heat exchange pipe through which the flowing heat medium flows first is disposed and the buried pipe in which the second underground heat exchange pipe through which the heat medium flows are disposed are other buried pipes. Compared to the distance, the heat An embedded pipe in which the underground heat exchange pipe through which the heat medium flows lastly is disposed and a second underground heat exchange pipe through which the heat medium flows last from The installed buried pipe is installed at a distance closer to the heat pump device than the other buried pipes, and the underground heat exchange pipe through which the heat medium flowing out from the heat pump device first circulates is provided. An interval between the buried pipe and the buried pipe in which the underground heat exchange pipe through which the heat medium flows last is arranged to be larger than the predetermined interval. Geothermal heat utilization system.   The buried pipe in which the underground heat exchange pipe through which the heat medium flowing out from the heat pump device first circulates is disposed, and the underground heat exchange pipe in which the heat medium circulates second from the last. 2. The geothermal heat utilization system according to claim 1, wherein an interval between the buried pipe and the buried pipe is made larger than the predetermined interval.   The buried pipe in which the underground heat exchange pipe through which the heat medium flowing out from the heat pump device circulates second is arranged, and the underground heat exchange pipe in which the heat medium circulates last is arranged. The ground heat utilization system according to claim 2, wherein an interval between the buried pipes is larger than the predetermined interval.   The buried pipe in which the underground heat exchange pipe through which the heat medium flowing out from the heat pump device circulates second is disposed, and the underground heat exchange pipe in which the heat medium circulates second from the last are arranged. 4. The geothermal heat utilization system according to claim 3, wherein an interval between the embedded pipe and the embedded pipe is set larger than the predetermined interval.   The buried pipe is composed of five pipes, and the buried pipe in which the underground heat exchange pipe through which the heating medium flows in the third order in the flow order of the heating medium is arranged around the other buried pipes. The geothermal heat utilization system according to claim 4, wherein the system is not installed at a position that is surrounded.

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