JP2018019660A - Heat exchange system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an efficient heat exchange system or the like that can be easily constructed or maintained.SOLUTION: A heat exchange system 1 is constituted by connecting a piping 11 for circulating heat medium and exchanging the heat of the heat medium to a heat pump 12. The heat exchange system 1 is provided for a roof-top rice paddy 2 on a roof-top slab of a structure 100, and the piping 11 is embedded in a soil layer of the roof-top rice paddy 2. Water is filled on the soil layer, and rice is cultivated. A water injection system is also provided for the roof-top rice paddy 2.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a heat exchange system.

  Due to the growing needs for energy saving, heat pump systems using geothermal heat have been spreading. This is a system that reduces the air-conditioning burden by using the underground heat in the winter and the cold in the summer (see, for example, Patent Document 1). On the other hand, an air heat utilization type heat pump system utilizing the roof of a building is also widespread, and the air heat is similarly used to reduce the air conditioning burden.

Japanese Patent Laid-Open No. 2003-21360

  In some heat pump systems that use geothermal heat, piping for circulating the heat medium is provided in the pile and this is placed in the ground, but initial costs such as pile driving costs become a problem, and the pile is driven. There is also a problem in terms of work schedule such as securing a schedule for the purpose. In some cases, pipes are buried in the foundation concrete, but problems remain in the maintenance method and the like when troubles occur in the pipes.

  Since the heat pump system using air heat uses atmospheric heat, the efficiency is generally lower than that of underground heat. In addition, there are problems such as rapid deterioration due to exposure to rain and wind, and installation that can withstand storms.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a heat exchange system and the like that are easy to construct and maintain and have high efficiency.

A first invention for solving the above-described problem is a heat exchange system that has a pipe for circulating a heat medium and exchanging heat of the heat medium, and is provided on a slab of a structure. The heat exchange system is characterized in that the pipe is embedded in a layer.
A second invention is a heat exchange system having a pipe for circulating a heat medium and exchanging heat of the heat medium, wherein the pipe is embedded in a water layer provided on a slab of a structure. This is a heat exchange system characterized by that.

  In the present invention, heat exchanging pipes are buried in the soil layers of rooftop paddy fields and rooftop parks. Can efficiently exchange heat using underground heat. In addition, pile driving is not necessary and construction is easy, and it is not necessary to embed piping in concrete, so piping is easy to dig and maintenance is easy. Moreover, it does not deteriorate by being exposed to rain and wind unlike an air heat utilization type heat pump system, and damage and the like are not caused by a storm. The same applies to the case where pipes are buried in a water layer such as a pond.

It is desirable to provide a heat pump connected to the piping.
Thereby, the heat pump system using piping buried in the soil layer etc. of the roof can be constructed. Since the heat exchange system of the present invention can efficiently exchange heat as described above, the heat pump can be made smaller than an air heat utilization type heat pump system installed on a rooftop, and the space can be effectively used. This makes it possible to reduce the load capacity and cost of the structure, and to suppress heat island formation due to exhaust heat.

In the heat exchange system of the first invention, it is desirable that vegetation is performed on the soil layer.
In this case, due to the heat dissipation effect due to the transpiration of the plant and the like, an improvement in the efficiency of heat exchange by the pipes embedded in the soil layer can be expected in summer and the like. In addition, it is possible to form an attractive landscape where you can come into contact with nature.

In the heat exchange system of the first invention, it is desirable that a water layer is provided on the soil layer. The water layer is, for example, a paddy field, and it is also desirable to have a water injection facility for pouring water into the paddy field when the water level of the paddy field falls below a predetermined value.
In this case, the temperature of the soil layer can be lowered, and an improvement in the efficiency of heat exchange using a pipe embedded in the soil layer can be expected in summer. In addition, growing rice on the soil layer is preferable in terms of improving interest in food and the natural environment, fostering regional communication, and biodiversity. By providing the above water injection equipment and maintaining the amount of water, it contributes not only to the growth surface of rice but also to the efficiency of heat exchange by piping in the summer.

In the heat exchange system of the first invention, it is desirable that the soil layer has water retention.
As a result, the moisture content of the soil layer can be controlled, and an improvement in the efficiency of heat exchange can be expected by improving the thermal conductivity of the soil layer.

The maximum value of the height of the surface of the soil layer or the water layer from the slab is preferably 300 mm or more.
Thereby, it becomes possible to embed the pipe at a depth of 300 mm or more such as a soil layer, the temperature of the soil layer around the pipe is stabilized, and the heat exchange system can be suitably operated.

It is desirable that the piping has flexibility.
Thereby, piping can follow the difference in the installation height.

  According to the present invention, it is possible to provide a heat exchange system and the like that are easy to construct and maintain and that are efficient.

The figure which shows the heat exchange system 1. FIG. The figure which shows arrangement | positioning of the piping 11. FIG. The figure which shows the heat exchange system 1 '. The figure which shows arrangement | positioning of the piping 11. FIG. The figure which shows the heat exchange system 1a. The figure which shows arrangement | positioning of the piping 11. FIG. The figure which shows the earth layer.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

[First embodiment]
FIG. 1 is a diagram showing a heat exchange system 1 according to the first embodiment of the present invention. The heat exchange system 1 is an outdoor facility provided in a roof paddy field 2 on a roof slab of a structure 100, and includes a pipe 11, a heat pump 12, a facility pipe 13, and the like. The structure 100 is not specifically limited, For example, it can be set as a building, a school, a house, a parking lot, a yard, a regulation pond, and other facilities.

  The piping 11 circulates the heat medium and performs heat exchange of the heat medium. For example, a flexible resin tube or the like is used. For example, polyethylene or vinyl chloride can be used as the resin. The pipe 11 is connected to the heat pump 12 and embedded in the soil layer of the roof paddy field 2. A heat medium is not specifically limited, The liquid etc. which are normally used as this kind of heat medium can be used.

  The pipe 11 is provided in a single stroke so as to exit from the heat pump 12 and return to the heat pump 12, and is arranged so that the substantially U-shaped portion is continuous. However, the arrangement of the piping 11 is not limited to this. For example, the pipes 11 can be arranged in a ladder shape or a spiral shape.

  The heat pump 12 uses the heat medium in the pipe 11 to change the temperature of the heat medium in the equipment pipe 13. The configuration of the heat pump 12 is not particularly limited, and a known one having a heat exchanger or the like can be used.

  The facility piping 13 is connected to the heat pump 12 and circulates a heat medium or the like used in various facilities such as an air conditioning facility installed in the structure 100.

  FIG. 2 is a diagram illustrating an example of the arrangement of the pipes 11 in the roof paddy field 2. The roof paddy field 2 is provided on the concrete roof slab of the structure 100.

  In the roof paddy field 2, a soil layer 22 is provided on a water-impervious sheet 21 (water-impervious layer) provided on the slab, and water 23 (water layer) is spread on the concave portion of the soil layer 22 to grow rice 24. Is.

  The pipe 11 is disposed on the water-impervious sheet 21 and is buried in the lowermost part of the soil layer 22, and heat exchange is performed between the heat medium circulating in the pipe 11 and the soil layer 22. The height of the surface (water surface) of the water 23 from the slab is set to a maximum value of 300 mm or more so that the pipe 11 can be buried at a depth of 300 mm or more from the water surface, but is not limited thereto.

  A drainage drain 25 is also embedded in the soil layer 22, and the amount of water in the soil layer 22 can be maintained at an appropriate value. The drain 25 is formed of a material having water permeability and is disposed at a relatively low position on the roof slab. It is also possible to provide a root prevention sheet (not shown) on the drain 25 to prevent clogging due to plant roots.

  The roof paddy field 2 is also provided with water injection equipment 27. The water injection facility 27 is connected to a water storage facility (not shown) for storing rainwater and the like, and performs water injection when the water level of the roof paddy field 2 becomes a predetermined value or less in the summer of the rice growing season. The water level of paddy fields is basically maintained from rice planting to draining before harvesting, and the period is from June to September or October, but is not limited to this. Moreover, the water injection equipment 27 can be omitted.

  In the construction of the heat exchange system 1, in the case of a newly constructed structure 100, after the roof slab is completed, a water shielding sheet 21 is laid on the roof slab, and a pipe 11, a drain 25, and other soil layers 22 are laid thereon. The equipment to be buried is arranged, the pipe 11 and the heat pump 12 are connected, the soil is carried in, and this is shaped to construct the soil layer 22. After that, it is the same as a normal paddy field, and rice 24 is planted and water 23 is spread on the soil layer 22 at a necessary time. In the case of the existing structure 100, the heat exchange system 1 can be constructed on the existing roof slab by the above procedure.

  In this embodiment, by embedding the heat exchanging pipe 11 in the soil layer 22 of the rooftop paddy field 2, as in the conventional heat pump system using the underground heat, the underground cold is used in the winter, Can efficiently exchange heat using underground heat. For example, in summer, the temperature difference between the outside air temperature and the soil layer 22 can be reduced to about 30 degrees. Moreover, the heat exchange system 1 of the present embodiment does not require pile driving or the like and is easy to construct, and pipes and the like are not buried in the concrete, so that the pipe 11 can be easily excavated and easily maintained. Moreover, it does not deteriorate by being exposed to rain and wind unlike an air heat utilization type heat pump system, and damage and the like are not caused by a storm.

  Moreover, in the heat exchange system 1 of this embodiment, since the efficient heat pump system using the piping 11 embed | buried under the soil layer 22 of a roof can be constructed | assembled, compared with the heat pump system using an air heat type which is installed on the roof. Thus, the heat pump 12 can be made small-scale, space can be effectively used, and the load resistance and cost of the structure 100 can be reduced, and the heat island caused by exhaust heat can be suppressed.

  In the present embodiment, the heat exchange system 1 is applied to the roof paddy field 2 and the water layer (water 23) is provided on the soil layer 22 in which the piping 11 is embedded, so that the soil layer 22 can be lowered in temperature, particularly in summer. It is expected that the efficiency of heat exchange will be improved by increasing the difference from the outside air temperature. Growing rice 24 and the like on the soil layer 22 is also preferable in terms of improving interest in food and the natural environment, fostering regional communication, biodiversity, and the like.

  In addition, by providing the water injection equipment 27 in the rooftop paddy field 2 and maintaining the amount of water in the summer season of the rice growing season, it contributes not only to the growth surface of the rice 24 but also to the efficiency of heat exchange by the piping 11 in the summer season. To do. In addition, when performing the normal management which plows the soil in the rooftop paddy field 2, there is also a risk of damaging the pipe 11, but there is also a method of performing management with no tillage, and in this case, there is no fear of damaging the pipe 11. .

  Further, since the pipe 11 has flexibility, when the pipe 11 is arranged in a plane as in the present embodiment, it is possible to follow a difference in installation height such as a slab step. Moreover, by burying the pipe 11 at a depth of 300 mm or more, the temperature of the soil layer 22 around the pipe is stabilized, and the heat exchange system 1 can be suitably operated.

  However, the present invention is not limited to this. For example, although the heat pump 12 is provided in the heat exchange system 1 in the present embodiment, the equipment pipe 13 may be arranged in the same manner as the pipe 11 in FIG. . Further, as shown in the heat exchange system 1 ′ in FIG. 3, the roof paddy field 2 may be divided into a plurality of zones, and a pipe 11, a heat pump 12, and the like may be provided for each zone.

  In this embodiment, a flexible resin tube is used as the pipe 11, but a metal pipe such as copper or stainless steel can also be used. In this case, it is possible to protect the piping 11 by providing a cushioning material such as a nonwoven fabric under the piping 11.

  Furthermore, although the heat exchange system 1 is applied to the rooftop paddy field 2 in this embodiment, it can also be applied to other rooftop farms such as a rooftop garden, and the same effects as described above can be obtained.

  For example, FIG. 4 shows an example of a roof garden where vegetables 26 are grown. In this case, it is not necessary to provide the water layer (water 23) as described above, but the maximum value from the slab on the surface of the soil layer 22 is shown. Is preferably set to 300 mm or more so that the pipe 11 can be buried at a depth of 300 mm or more from the surface of the soil layer 22. In particular, in the case where the load on the structure 100 is limited, such as in the case of the existing structure 100, the height of the soil layer surface is increased without increasing the load of the soil layer 22 when newly constructing a roof garden or the like. Therefore, it is also possible to use a lightweight spacer such as a bag or foam having a gap, or lightweight soil. The spacer can also serve as a mark indicating the position of the pipe 11 when the soil layer 22 is dug up and maintenance of the pipe 11 is performed.

  Hereinafter, another example of the present invention will be described as a second embodiment. In the second embodiment, differences from the first embodiment will be described, and the same points will be denoted by the same reference numerals in the drawings and the like, and the description thereof will be omitted. The configurations of the first and second embodiments can be combined as necessary.

[Second Embodiment]
FIG. 5 is a diagram showing a heat exchange system 1a according to the second embodiment of the present invention. The heat exchange system 1a of this embodiment is different from that of the first embodiment in that it is provided in a rooftop park (garden) 3 having a green space 31, a pond 32, trees 33, and the like.

  FIG. 6 is a diagram illustrating an example of the arrangement of the pipes 11 in the rooftop park 3. The rooftop park 3 is provided on the concrete roof slab of the structure 100.

  The rooftop park 3 is provided with a soil layer 35 (soil or sand) on a water-impervious sheet 34 provided on the slab, and water is placed on the concave portion of the soil layer 35 to form a pond 32 (water layer). The vegetation is planted on top of the green area 31. The maximum value from the slab on the surface of the soil layer 35 is, for example, 500 mm or more. The pipe 11 is installed (buried) on the bottom of the pond 32 or buried in the soil layer 35 of the green space 31. It is also possible to dig up the soil layer 35 of the green space 31 and perform maintenance of the piping 11.

  Also in this case, the same effect as that of the first embodiment is obtained by embedding the pipe 11 in the soil layer 35, and the same effect can be obtained even in the case where the pipe 11 is installed in water in the pond 32. In addition, by performing vegetation on the soil layer 35, the heat dissipation effect due to the transpiration of plants, etc., can be expected to improve the efficiency of heat exchange by the piping 11 embedded in the soil layer 35 in summer, etc. Can be formed. The same applies to the rice 24 in the roof paddy field 2 and the vegetables 26 in the roof garden.

  Moreover, by exchanging heat of the heat medium in the pipe 11 in a public space such as the rooftop park 3, the heat exchange system 1a can be suitably used for district cooling and heating. In addition, during heavy rains, water can be retained in the soil layer 35 to prevent outflow into the city.

  In addition, it is possible to provide an automatic watering facility in the green space 31 or the like. By spraying water in summer or the like, the temperature of the soil layer 35 is stabilized, and the water content of the soil layer 35 is maintained within a predetermined range. Improvement in heat exchange efficiency due to improvement in the thermal conductivity of the layer 35 can be expected. This water content (water content) is, for example, about 20% by weight. It is also possible to monitor the amount of water in the soil layer 35 with a monitoring device, and to spray water manually or with the above-mentioned automatic watering equipment when outside a predetermined range. The same applies to the case of the above-mentioned roof garden.

  In order to control the moisture content of the soil layer 35, the soil layer 35 may have water retention. Water retention can be realized by a member having voids for storing moisture, and a water retention material or porous soil made of fibers having voids can be used as the member. Further, as shown in FIG. 7, it is also possible to realize water retention by the surface tension effect of voids in these layers, with the lower part of the soil layer 35 being a coarser particle layer and the upper part being a finer particle layer. This can also be expected to improve the efficiency of heat exchange by improving the thermal conductivity of the soil layer 35.

  As described above, the heat exchange system of the present invention can be applied to various outdoor spaces, and can also be applied to biotopes, pastures, and the like in addition to the above-described rooftop farms and rooftop parks.

  The preferred embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to such examples. It will be apparent to those skilled in the art that various changes or modifications can be conceived within the scope of the technical idea disclosed in the present application, and these are naturally within the technical scope of the present invention. Understood.

1, 1 ′, 1a; heat exchange system 2; roof paddy field 3; rooftop park 11; pipe 12; heat pump 13; equipment pipes 21, 34; 26; Vegetable 27; Water injection facility 31; Green space 32; Pond 33; Tree 100;

Claims (10)

A heat exchange system having a pipe for circulating the heat medium and performing heat exchange of the heat medium,
A heat exchange system, wherein the pipe is embedded in a soil layer provided on a slab of a structure. A heat exchange system having a pipe for circulating the heat medium and performing heat exchange of the heat medium,
A heat exchange system, wherein the pipe is embedded in a water layer provided on a slab of a structure.   The heat exchange system according to claim 1, further comprising a heat pump connected to the pipe.   The heat exchange system according to claim 1, wherein vegetation is performed on the soil layer.   The heat exchange system according to claim 1, wherein a water layer is provided on the soil layer.   The heat exchange system according to claim 5, wherein the water layer is a paddy field.   The heat exchange system according to claim 6, further comprising a water injection facility for injecting water into the paddy field when a water level of the paddy field becomes a predetermined value or less.   The heat exchanging system according to any one of claims 1, 4, 5, 6, and 7, wherein the soil layer has water retention.   The heat exchange system according to any one of claims 1 to 8, wherein the maximum value of the height of the surface of the soil layer or the water layer from the slab is 300 mm or more.   The heat exchange system according to any one of claims 1 to 9, wherein the pipe has flexibility.