JP2017180004A - Heat storing floor structure - Google Patents

Heat storing floor structure Download PDF

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JP2017180004A
JP2017180004A JP2016072118A JP2016072118A JP2017180004A JP 2017180004 A JP2017180004 A JP 2017180004A JP 2016072118 A JP2016072118 A JP 2016072118A JP 2016072118 A JP2016072118 A JP 2016072118A JP 2017180004 A JP2017180004 A JP 2017180004A
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heat storage
heat
floor
floor structure
heating panel
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JP6730060B2 (en
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佐藤　友紀
Tomonori Sato
友紀 佐藤
成紀 石黒
Shigenori Ishiguro
成紀 石黒
邦具 水島
Kunitomo Mizushima
邦具 水島
太田　勇
Isamu Ota
勇 太田
隆士 川上
Takashi Kawakami
隆士 川上
佐藤　理人
Masato Sato
理人 佐藤
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Misawa Homes Co Ltd
Daiken Corp
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Misawa Homes Co Ltd
Daiken Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a heat storing floor structure combining a floor heating panel 4 that houses a heated water pipe 5 with a heat storage mat 2, the heat storing floor structure offering high heat conduction efficiency from the floor heating panel 4 to the heat storage mat 2 and high workability, at the same time preventing discomfort for a pedestrian while walking.SOLUTION: A heat storage mat 2 is placed on a floor substrate 1, and a wooden board material 3 and a plate-form floor heating panel 4 that houses a heated water pipe 5 are piled thereon in that order.SELECTED DRAWING: Figure 1

Description

本発明は、発熱パネルに蓄熱体を組み合わせた蓄熱床構造に関する。   The present invention relates to a heat storage floor structure in which a heat storage body is combined with a heat generating panel.

従来、建物内部の床面を暖房するための床暖房構造として、例えば特許文献１に示されるように、ベースボード上に、蓄熱性のある制振遮音板及び合成樹脂発泡シートをこの順に載置し、合成樹脂発泡シート上に複数の面状発熱体を配置し、面状発熱体の上面にフローリング材を設けた暖房床構造が知られている。   Conventionally, as a floor heating structure for heating a floor surface inside a building, for example, as shown in Patent Document 1, a heat-damping sound insulation board and a synthetic resin foam sheet are placed in this order on a base board. A heating floor structure in which a plurality of planar heating elements are arranged on a synthetic resin foam sheet and a flooring material is provided on the upper surface of the planar heating element is known.

特開２００２−１０６１５９号公報JP 2002-106159 A

上記特許文献１のものでは、発熱体と制振遮音板との間に合成樹脂発泡シートが施工されている。しかしながら、当該構造は、制振遮音効果を主たる狙いとしていることから、合成樹脂発泡シートとしては、熱伝導率が小さく、発熱体の熱を制振遮音板に十分に伝えることが難しい。同様に、発熱体と制振遮音板との間に合成樹脂発泡シートが介在しているため、制振遮音板に蓄積された熱が表面床材に伝わりにくい。すなわち、制振遮音板の蓄熱性能が十分に発揮されないという問題がある。   In the thing of the said patent document 1, the synthetic resin foam sheet is constructed between the heat generating body and the damping sound insulation board. However, since the structure is mainly aimed at the vibration damping and sound insulation effect, the synthetic resin foam sheet has a low thermal conductivity, and it is difficult to sufficiently transfer the heat of the heating element to the vibration damping and sound insulation plate. Similarly, since the synthetic resin foam sheet is interposed between the heating element and the vibration damping sound insulation board, the heat accumulated in the vibration damping sound insulation board is difficult to be transmitted to the surface flooring material. That is, there is a problem that the heat storage performance of the vibration damping sound insulating plate is not sufficiently exhibited.

さらに、合成樹脂発泡シートは、軟質材であるため、硬質材を使用する場合と比較して施工不備によるフローリング材の不陸が発生しやすい。また、歩行時の床材の沈み込みにより、歩行者に歩行中の違和感が生じる場合がある。   Furthermore, since the synthetic resin foam sheet is a soft material, the flooring material is more likely to be uneven due to inadequate construction compared to the case where a hard material is used. In addition, a sinking of the floor material during walking may cause the pedestrian to feel uncomfortable while walking.

本発明は斯かる諸点に鑑みてなされたもので、その目的は、発熱部を有する床材に蓄熱体を組み合わせた蓄熱床構造において、床材から蓄熱体への熱伝達効率が高く、施工性に優れ、かつ、歩行者に歩行中の違和感を生じさせないようにすることにある。   The present invention has been made in view of such various points, and the object thereof is a heat storage floor structure in which a heat storage body is combined with a floor material having a heat generating portion, and the heat transfer efficiency from the floor material to the heat storage body is high, and the workability is improved. It is to prevent the pedestrian from feeling uncomfortable while walking.

上記の目的を達成するために、この発明では、床下地上に蓄熱体と、木質板材と、発熱部が収容された板状の床材とを、その記載順で積層状態に施工するようにした。これにより、床材の発熱部の熱が蓄熱体に伝わりやすくなる。   In order to achieve the above object, in the present invention, a heat storage body, a wooden board material, and a plate-like floor material in which a heating part is accommodated are constructed in a laminated state in the order of description. . Thereby, the heat of the heat generating part of the flooring is easily transmitted to the heat storage body.

具体的には、第１の発明に係る潜熱蓄熱床構造は、床下地上に蓄熱体が載置され、前記蓄熱体上に、木質板材と、発熱部が収容された板状の床材とが記載順に重ねられた状態で施工されていることを特徴とする。   Specifically, in the latent heat storage floor structure according to the first aspect of the present invention, a heat storage body is placed on a floor base, and a wooden board and a plate-like floor material in which a heat generating part is housed on the heat storage body. It is constructed in the state of being stacked in the order of description.

なお、本発明においては、発熱とは温熱に限らず冷熱を生じさせることも含む。   In the present invention, heat generation includes not only warm heat but also cold heat.

この第１の発明では、蓄熱体、木質板材及び床材が積層状態になるように施工している。ここで、木質板材は、従来の蓄熱床構造において用いられている合成樹脂発泡シート等と比較して熱伝導率が大きい。そのため、従来技術と比較して床材の発熱部の熱が蓄熱体に伝わりやすくなる。同様に、蓄熱体から放出された熱も木質板材を介して床材に伝わりやすくなる。すなわち、床材（発熱部）と蓄熱体との間における熱伝導効率が上昇するため、蓄熱体の蓄熱性能を十分に発揮させることができる。したがって、床材つまり床面の温熱又は冷熱の持続効果を高めることができる。   In this 1st invention, it constructs so that a thermal storage body, a wooden board material, and a flooring may be in a lamination state. Here, the wood board has a higher thermal conductivity than a synthetic resin foam sheet or the like used in a conventional heat storage floor structure. Therefore, compared with the prior art, the heat of the heat generating part of the flooring is easily transmitted to the heat storage body. Similarly, the heat released from the heat storage body is easily transmitted to the floor material via the wood board. That is, since the heat conduction efficiency between the flooring (heat generating portion) and the heat storage body is increased, the heat storage performance of the heat storage body can be sufficiently exhibited. Accordingly, it is possible to enhance the effect of sustaining the heat or cold of the floor material, that is, the floor surface.

また、木質板材上に発熱部が収容された板状の床材を施工するようにしたので、蓄熱体の寸法が熱によって変化した場合においても、蓄熱体の寸法変化による床材への影響を防止することができる。すなわち、上記床材への影響を考慮した施工が不要であり、施工性に優れている。   In addition, since a plate-like floor material in which a heat generating part is accommodated is constructed on a wooden board material, even when the heat storage body dimensions change due to heat, the influence of the heat storage body dimension change on the floor material is affected. Can be prevented. That is, the construction in consideration of the influence on the flooring is unnecessary, and the construction is excellent.

さらに、木質板材は、合成樹脂発泡シート等と比較すると硬度が十分に高いため、本態様によると、歩行者に歩行中の違和感を生じさせないようにすることができる。   Furthermore, since the wooden board material has a sufficiently high hardness as compared with a synthetic resin foam sheet or the like, according to this aspect, it is possible to prevent the pedestrian from feeling uncomfortable during walking.

第２の発明は、前記床材は、凹溝を有する木質基材の該凹溝内に、温水又は冷水が内部を流れる前記発熱部としてのパイプが一体的に収容された一体型の床材である、ことを特徴とする。   According to a second aspect of the present invention, the floor material is an integrated floor material in which a pipe as the heat generating portion through which hot water or cold water flows is integrally accommodated in the concave groove of a wooden base material having a concave groove. It is characterized by being.

この第２の発明では、発熱部が木質基材に一体的に収容されたパイプである場合に、蓄熱体の蓄熱性及び蓄熱床構造の施工性を高めることができる。   In this 2nd invention, when a heat-emitting part is a pipe integrally accommodated in the wooden base material, the heat storage property of a heat storage body and the construction property of a heat storage floor structure can be improved.

第３の発明は、前記木質板材は、厚みが２ｍｍ以上かつ１２ｍｍ以下であり、かつ、熱伝導率が０．１［Ｗ／ｍＫ］以上である、ことを特徴とする。   In a third aspect of the present invention, the wood board has a thickness of 2 mm or more and 12 mm or less, and a thermal conductivity of 0.1 [W / mK] or more.

この第３の発明では、第１及び第２の発明と同様に、蓄熱体の蓄熱性能を十分に発揮させることができるとともに、蓄熱床構造の施工性を高めることができる。   In the third invention, as in the first and second inventions, the heat storage performance of the heat storage body can be sufficiently exhibited, and the workability of the heat storage floor structure can be enhanced.

木質板材の厚さは、２ｍｍよりも薄いと、剛性がなく施工しにくくなる場合がある一方、１２ｍｍより厚いと、熱抵抗が大きくなり下部の蓄熱体に十分に蓄熱されない場合があるため、２ｍｍ以上かつ１２ｍｍ以下に設定されている。また、熱伝導率は、０．１［Ｗ／ｍＫ］より小さいと、熱抵抗が大きくなり下部の蓄熱体に十分に蓄熱されない場合があるため、０．１［Ｗ／ｍＫ］以上に設定されている。   If the thickness of the wood board is less than 2 mm, it may not be rigid and difficult to construct. On the other hand, if the thickness is more than 12 mm, the thermal resistance may increase and the lower heat storage body may not store heat sufficiently. It is set to 12 mm or less. Further, if the thermal conductivity is smaller than 0.1 [W / mK], the thermal resistance increases and the lower heat storage body may not be sufficiently stored, so it is set to 0.1 [W / mK] or more. ing.

以上説明したように、本発明によると、蓄熱体、木質板材及び床材が積層状態になるように施工したことにより、床材と蓄熱体との間における熱伝導効率が上がるとともに、蓄熱床構造の施工性を高めることができる。   As described above, according to the present invention, the heat storage body, the wooden board material, and the flooring are constructed so as to be in a laminated state, thereby increasing the heat conduction efficiency between the flooring and the heat storage body, and the heat storage floor structure. Can improve the workability.

図１は、本発明の実施形態に係る蓄熱床構造の断面図である。FIG. 1 is a cross-sectional view of a heat storage floor structure according to an embodiment of the present invention.

以下、本発明の実施形態を図面に基づいて詳細に説明する。以下の実施形態の説明は、本質的に例示に過ぎず、本発明、その適用物或いはその用途を制限することを意図するものでは全くない。   Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The following description of the embodiments is merely illustrative in nature and is not intended to limit the present invention, its application, or its use at all.

図１は本発明の実施形態に係る蓄熱床構造を示している。   FIG. 1 shows a heat storage floor structure according to an embodiment of the present invention.

図１に示すように、建物内部の室内の床面における床下地１の上には、蓄熱材からなる複数の蓄熱マット２，２，…が敷き詰められて施工されている。蓄熱マット２は、例えば、厚さが３ｍｍ以上の矩形板状又はシート状であり、例えば、その厚さが１５ｍｍ以上であってもよい。蓄熱マット２には、合成ゴムを主原料としたもの又はアスファルトを主原料としたもののように顕熱容量の大きな材料が好適に用いられる。或いは、パラフィン、無機塩及び／又はオレフィン等を含んだ潜熱容量の大きな材料が用いられる。図示しないが、蓄熱マット２は、例えば、ステープル等の締結具によって床下地１に固定された状態で施工されている。なお、図示しないが、各蓄熱マット２は、隣接する蓄熱マット２との間に数ｍｍの間隔をあけた状態で敷き詰められていてもよい。   As shown in FIG. 1, a plurality of heat storage mats 2, 2,... Made of a heat storage material are spread and installed on the floor foundation 1 on the floor surface inside the building. The heat storage mat 2 has, for example, a rectangular plate shape or sheet shape with a thickness of 3 mm or more, and may have a thickness of 15 mm or more, for example. For the heat storage mat 2, a material having a large sensible heat capacity such as a material using synthetic rubber as a main material or a material using asphalt as a main material is suitably used. Alternatively, a material having a large latent heat capacity containing paraffin, inorganic salt, and / or olefin is used. Although not shown, the heat storage mat 2 is applied in a state of being fixed to the floor base 1 with a fastener such as staples, for example. In addition, although not shown in figure, each heat storage mat 2 may be spread | paved in the state which left the space | interval of several mm between the adjacent heat storage mats 2. As shown in FIG.

床下地１上に敷き詰められた蓄熱マット２の上には、木質板材３と、下面に凹溝４２を有していて該凹溝４２内に温水パイプ５が一体的に収容された一体型の床暖房パネル４とが、その記載順に重ねられた状態で施工されている。   On the heat storage mat 2 spread on the floor base 1, there is a wood plate material 3 and a concave groove 42 on the lower surface, and the hot water pipe 5 is integrally accommodated in the concave groove 42. The floor heating panel 4 is constructed in a state of being stacked in the order of description.

木質板材３は、例えば、厚さが２〜１２ｍｍであり、かつ、熱伝導率が０．１［Ｗ／ｍＫ］以上のものが好適に用いられる。例えば、木質板材３の厚さが２ｍｍよりも薄いと、施工に必要な剛性がなく、施工性が低下する場合がある。一方で、木質板材３の厚さが１２ｍｍより厚いと、木質板材３の熱抵抗が大きくなり、温水パイプ５の熱が蓄熱マット２に伝わりにくくなり、蓄熱マット２の蓄熱性能が十分に発揮されなくなる場合がある。また、例えば、木質板材３の熱伝導率が０．１［Ｗ／ｍＫ］より小さいと、木質板材３の熱抵抗が大きくなり、温水パイプ５の熱が蓄熱マット２に伝わりにくくなり、蓄熱マット２の蓄熱性能が十分に発揮されなくなる場合がある。木質板材３として、例えば、合板、ＭＤＦ（中密度繊維板）、パーティクルボード、ＯＳＢ（配向性ストランドボード）、ハードボード等が用いられる。   For example, the wood board 3 having a thickness of 2 to 12 mm and a thermal conductivity of 0.1 [W / mK] or more is preferably used. For example, when the thickness of the wooden board 3 is less than 2 mm, there is no rigidity required for construction, and workability may be reduced. On the other hand, if the thickness of the wooden board 3 is larger than 12 mm, the thermal resistance of the wooden board 3 is increased, the heat of the hot water pipe 5 is not easily transmitted to the heat storage mat 2, and the heat storage performance of the heat storage mat 2 is sufficiently exhibited. It may disappear. For example, when the thermal conductivity of the wooden board 3 is smaller than 0.1 [W / mK], the thermal resistance of the wooden board 3 is increased, and the heat of the hot water pipe 5 is not easily transmitted to the thermal storage mat 2, and the thermal storage mat The heat storage performance of 2 may not be fully exhibited. As the wood board 3, for example, plywood, MDF (medium density fiber board), particle board, OSB (oriented strand board), hard board and the like are used.

床暖房パネル４は、例えば、厚さが１０ｍｍ程度の合板、単板、ＭＤＦ等からなる長尺板状のパネル本体４１を有し、その裏面（下面）には、短辺方向及び長辺方向に互いに平行な部分を有するように蛇行して延びる凹溝４２が形成されている。この凹溝４２内にはアルミ箔等の放冷熱材を介して温水パイプ５が収容配置され、この温水パイプ５内を温水が流れるようになっている。また、パネル本体４１の一方の短辺には、突条からなる雄実４３が形成されており、他方の短辺には雄実４３と嵌合可能な条溝からなる雌実４４が形成されている。   The floor heating panel 4 has a long plate-like panel body 41 made of, for example, a plywood having a thickness of about 10 mm, a single plate, MDF, or the like, and has a short side direction and a long side direction on the back surface (lower surface). The groove 42 is formed to meander so as to have portions parallel to each other. The hot water pipe 5 is accommodated and disposed in the concave groove 42 via a cooling heat material such as aluminum foil, and the hot water flows through the hot water pipe 5. In addition, a male fruit 43 made of a ridge is formed on one short side of the panel body 41, and a female fruit 44 made of a groove that can be fitted to the male fruit 43 is formed on the other short side. ing.

蓄熱床構造を施工する際には、木質板材３上に床冷暖房用接着剤６を塗布し、かつ、床暖房パネル４のパネル本体４１の雄実４３及び雌実４４に接着剤を塗布した後、その雄実４３及び雌実４４をそれぞれ隣接する床暖房パネル４の雄実４３及び雌実４４と嵌合した上で、床暖房パネル４を木質板材３上に載置して、接着剤を固化させる。さらに、その後にフローリング用ステープル等を用いて、床暖房パネル４を木質板材３に固定することにより施工すればよい。例えば、パネル本体の表面に、化粧単板等からなる表面材を貼り付けてもよい。   When constructing the heat storage floor structure, after applying the floor cooling / heating adhesive 6 on the wood board 3 and applying the adhesive to the male fruit 43 and the female fruit 44 of the panel body 41 of the floor heating panel 4 After mating the male fruit 43 and the female fruit 44 with the male fruit 43 and the female fruit 44 of the adjacent floor heating panel 4, the floor heating panel 4 is placed on the wood board 3, and the adhesive is applied. Solidify. Further, the floor heating panel 4 may be fixed to the wood board 3 by using flooring staples or the like thereafter. For example, you may affix the surface material which consists of a decorative veneer etc. on the surface of a panel main body.

以上のように、本実施形態によると、床下地１の上に複数の蓄熱マット２，２，…が敷き詰められて施工されており、蓄熱マット２の上には、木質板材３と、下面の凹溝４２内に温水パイプ５が一体的に収容された一体型の床暖房パネル４とが、記載順に重ねられた状態で施工されている。ここで、木質板材３は、従来技術（例えば、合成樹脂発泡シート）と比較して熱伝導率が大きいため、床暖房パネル４の温水パイプ５の熱が蓄熱マット２に伝わりやすくなる。同様に、蓄熱マット２から放出された熱も木質板材３を介して床暖房パネル４に伝わりやすくなる。このように、床暖房パネル４と蓄熱マット２との間の熱伝導効率が上昇するため、蓄熱マット２の蓄熱性能を十分に発揮させることができ、床暖房パネル４の温熱の持続効果を高めることができる。   As described above, according to the present embodiment, a plurality of heat storage mats 2, 2,... Are spread on the floor base 1, and on the heat storage mat 2, the wooden board 3 and the bottom surface The integrated floor heating panel 4 in which the hot water pipes 5 are integrally accommodated in the concave grooves 42 is applied in a state where they are stacked in the order of description. Here, since the wood board 3 has a larger thermal conductivity than that of the conventional technique (for example, a synthetic resin foam sheet), the heat of the hot water pipe 5 of the floor heating panel 4 is easily transmitted to the heat storage mat 2. Similarly, the heat released from the heat storage mat 2 is also easily transmitted to the floor heating panel 4 through the wood board 3. As described above, since the heat conduction efficiency between the floor heating panel 4 and the heat storage mat 2 is increased, the heat storage performance of the heat storage mat 2 can be sufficiently exhibited, and the sustained effect of the heat of the floor heating panel 4 is enhanced. be able to.

また、蓄熱又は放熱の過程において、温度変化に起因して蓄熱マット２の寸法が変化した場合においても、蓄熱マット２と床暖房パネル４との間に木質板材３が介在しているため、蓄熱マット２の寸法変化による床暖房パネル４への影響を防止することができる。すなわち、上記床暖房パネル４への影響を考慮した施工が不要であり、施工性が優れている。   Further, even when the size of the heat storage mat 2 changes due to a temperature change in the process of heat storage or heat dissipation, the wood plate material 3 is interposed between the heat storage mat 2 and the floor heating panel 4. The influence on the floor heating panel 4 due to the dimensional change of the mat 2 can be prevented. That is, the construction in consideration of the influence on the floor heating panel 4 is unnecessary, and the workability is excellent.

さらに、木質板材３は、従来技術に係る合成樹脂発泡シート等と比較すると硬度が十分に高いため、歩行者に歩行時の床材の沈み込みによる違和感を生じさせないようにすることができる。   Furthermore, since the wooden board 3 has a sufficiently high hardness as compared with the synthetic resin foam sheet according to the prior art, it is possible to prevent the pedestrian from feeling uncomfortable due to the sinking of the flooring material during walking.

（その他の実施形態）
なお、上記実施形態は、温水パイプ５を有する床暖房パネル４によって床暖房を行う蓄熱床構造の場合であるが、冷水を流す冷水パイプを有する床冷房パネルによって床冷房を行うようにしてもよく、温水又は冷水を流す配管を有する一体型の床冷暖房パネルによって床暖房及び床冷房を切り換えて行うようにすることもできる。この場合においても、上記実施形態と同様の効果が得られる。すなわち、床冷房パネルの冷熱の持続効果又は床冷暖房パネルの温熱又は冷熱の持続効果を高めることができ、施工性に優れるとともに、歩行者の歩行に違和感がないようにすることができる。 (Other embodiments)
In addition, although the said embodiment is a case of the thermal storage floor structure which performs floor heating by the floor heating panel 4 which has the hot water pipe 5, you may make it perform floor cooling by the floor cooling panel which has the cold water pipe which flows cold water. It is also possible to switch between floor heating and floor cooling by an integrated floor cooling / heating panel having piping through which hot water or cold water flows. Even in this case, the same effect as the above-described embodiment can be obtained. That is, the continuous cooling effect of the floor cooling panel or the continuous heating or cooling effect of the floor cooling / heating panel can be enhanced, and the workability is excellent, and the pedestrian can be prevented from feeling uncomfortable.

また、床暖房を行う場合において、温水パイプ５に代えて電気ヒータを用いてもよい。   In addition, when performing floor heating, an electric heater may be used instead of the hot water pipe 5.

本発明は、床下地の上に、蓄熱体、木質板材、及び発熱部が収容された床暖房パネルをその順番で積層状態に施工するようにしたため、熱伝達効率が高く、施工性に優れるので、極めて有用である。   In the present invention, since the floor heating panel in which the heat storage body, the wooden board material, and the heat generating part are housed in the order is laminated on the floor base, the heat transfer efficiency is high and the workability is excellent. Is extremely useful.

１ 床下地
２ 蓄熱マット（蓄熱体）
３ 木質板材
４ 床材（床暖房パネル）
５ 温水パイプ（発熱部） 1 Floor base 2 Heat storage mat (heat storage body)
3 Wood board 4 Floor material (floor heating panel)
5 Hot water pipe (heating part)

Claims (3)

床下地上に蓄熱体が載置され、
前記蓄熱体上に、木質板材と、発熱部が収容された板状の床材とが記載順に重ねられた状態で施工されていることを特徴とする蓄熱床構造。 A heat storage is placed on the floor base,
A heat storage floor structure in which a wooden board and a plate-like floor material in which a heat generating portion is accommodated are stacked on the heat storage body in the order of description. 請求項１記載された蓄熱床構造において、
前記床材は、凹溝を有する木質基材の該凹溝内に、温水又は冷水が内部を流れる前記発熱部としてのパイプが一体的に収容された一体型の床材である、ことを特徴とする蓄熱床構造。 In the thermal storage floor structure described in Claim 1,
The flooring material is an integrated flooring material in which pipes as the heat generating parts through which hot water or cold water flows are integrally accommodated in the groove of a wooden substrate having a groove. Thermal storage floor structure. 請求項１又は２に記載された蓄熱床構造において、
前記木質板材は、厚みが２ｍｍ以上かつ１２ｍｍ以下であり、かつ、熱伝導率が０．１［Ｗ／ｍＫ］以上である、ことを特徴とする蓄熱床構造。 In the heat storage floor structure according to claim 1 or 2,
The heat storage floor structure characterized in that the wood board has a thickness of 2 mm or more and 12 mm or less and a thermal conductivity of 0.1 [W / mK] or more.
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JP2000080755A (en) * 1998-07-02 2000-03-21 Kika Ko Heating and cooling panel and room heating and cooling system using it
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JP7542833B1 (en) 2023-03-09 2024-09-02 株式会社こころ一生に Floor heating and cooling system

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