JP4555135B2

JP4555135B2 - Hot water storage system

Info

Publication number: JP4555135B2
Application number: JP2005098956A
Authority: JP
Inventors: 保人杉村; 享齋藤; 收田島; 透川畑; 真壮井上; 元幸市川
Original assignee: Sekisui House Ltd; Japan Research Institute Ltd; Eneos Celltech Co Ltd
Current assignee: Sekisui House Ltd; Japan Research Institute Ltd; Eneos Celltech Co Ltd
Priority date: 2005-03-30
Filing date: 2005-03-30
Publication date: 2010-09-29
Anticipated expiration: 2025-03-30
Also published as: JP2006275476A

Description

本発明は、温水を貯湯する貯湯システムに関する。特に本発明は、燃料電池を冷却することによって得られる温水を貯湯する貯湯システムに関する。 The present invention relates to a hot water storage system for storing hot water. In particular, the present invention relates to a hot water storage system that stores hot water obtained by cooling a fuel cell.

従来の燃料電池発電システムにおいては、改質装置、燃料電池、制御系、補機、電力変換装置などが一つの外装ケース内に収容され、当該ケースが各家庭の屋外などに設置されている（例えば、特許文献１参照。）。また、燃料電池による発電の過程で発生した熱を利用して市水から温水を生成し、当該温水を屋外に設置された貯湯タンクに蓄える。そして、貯湯タンクに蓄えられた温水は、例えば給湯需要に供給される。
特開２００３-１９９２５４号公報 In a conventional fuel cell power generation system, a reformer, a fuel cell, a control system, an auxiliary machine, a power converter, and the like are housed in one exterior case, and the case is installed outdoors in each home ( For example, see Patent Document 1.) In addition, hot water is generated from city water using heat generated in the process of power generation by the fuel cell, and the hot water is stored in a hot water storage tank installed outdoors. And the hot water stored in the hot water storage tank is supplied to hot water supply demand, for example.
JP 2003-199254 A

例えば、住宅に貯湯タンクを設置する場合において、貯湯タンクの設置スペースを節約すべく貯湯タンクの容量をより小さくすると、燃料電池の運転によってより短い時間で貯湯タンクが規定温度の温水で満たされてしまう。貯湯タンクが規定温度の温水で満たされ、かつ、給湯需要が消費する熱量が燃料電池の生成する熱量に比べて小さい場合には、燃料電池を十分に冷却することができない。このため、燃料電池の運転を停止する必要があった。しかし、燃料電池の運転を停止すると、電力負荷への給電が停止するので好ましくない。また、燃料電池の運転と停止を頻繁に繰り返すと燃料電池の劣化が早まるので好ましくない。 For example, when installing a hot water storage tank in a house, if the capacity of the hot water storage tank is made smaller to save the space for installing the hot water storage tank, the hot water storage tank will be filled with hot water at the specified temperature in a shorter time due to the operation of the fuel cell. End up. When the hot water storage tank is filled with hot water at a specified temperature and the amount of heat consumed by the hot water supply demand is smaller than the amount of heat generated by the fuel cell, the fuel cell cannot be cooled sufficiently. For this reason, it was necessary to stop the operation of the fuel cell. However, stopping the operation of the fuel cell is not preferable because power supply to the power load is stopped. In addition, frequent repetition of operation and stop of the fuel cell is not preferable because deterioration of the fuel cell is accelerated.

そこで本発明は、上記の課題を解決することができる建物を提供することを目的とする。この目的は特許請求の範囲における独立項に記載の特徴の組み合わせにより達成される。また従属項は本発明の更なる有利な具体例を規定する。 Then, an object of this invention is to provide the building which can solve said subject. This object is achieved by a combination of features described in the independent claims. The dependent claims define further advantageous specific examples of the present invention.

本発明の第１の形態における貯湯システムは、熱源からの熱量を受け取ることによって加温される温水を貯湯する第１の貯湯部と、熱源からの熱量を受け取ることによって加温される温水を貯湯し、第１の貯湯部より断熱性の低い第２の貯湯部とを備え、第１の貯湯部は、第２の貯湯部よりも優先的に熱量を受け取ることによって加温された温水を貯湯する。 The hot water storage system according to the first aspect of the present invention includes a first hot water storage section that stores hot water heated by receiving heat from the heat source, and hot water heated by receiving heat from the heat source. And a second hot water storage part having a lower thermal insulation than the first hot water storage part, and the first hot water storage part stores hot water heated by receiving heat in preference to the second hot water storage part. To do.

第１の貯湯部は、第２の貯湯部に貯湯される温水よりも高温の温水を貯湯する。第１の貯湯部は、第２の貯湯部より上方に設けられ、第１の貯湯部の下部と第２の貯湯部の上部とを接続する接続配管を更に備える。第１の貯湯部に貯湯された温水を給湯需要に給湯する給湯配管を更に備える。 The first hot water storage section stores hot water that is hotter than the hot water stored in the second hot water storage section. The 1st hot water storage part is provided above the 2nd hot water storage part, and is further provided with connection piping which connects the lower part of the 1st hot water storage part, and the upper part of the 2nd hot water storage part. A hot water supply pipe for supplying hot water stored in the first hot water storage section to hot water supply demand is further provided.

第２の貯湯部の内部に貯湯される温水の体積に対する表面積の比は、第１の貯湯部の内部に貯湯される温水の体積に対する表面積の比よりも大きくてよい。 The ratio of the surface area to the volume of hot water stored in the second hot water storage section may be larger than the ratio of the surface area to the volume of hot water stored in the first hot water storage section.

第１の貯湯部の周囲に設けられる第１の断熱材と、第２の貯湯部の周囲に設けられる第２の断熱材とを更に備え、第２の断熱材は、第１の断熱材の断熱性より低い断熱性を持ってよい。 A first heat insulating material provided around the first hot water storage unit, and a second heat insulating material provided around the second hot water storage unit, wherein the second heat insulating material is made of the first heat insulating material. It may have a heat insulating property lower than the heat insulating property.

第２の断熱材の厚さは、第１の断熱材の厚さよりも薄い。第１の貯湯部は、外部に断熱材を有し、第２の貯湯部は、外部に断熱材を含まなくてよい。 The thickness of the second heat insulating material is thinner than the thickness of the first heat insulating material. The 1st hot water storage part has a heat insulating material outside, and the 2nd hot water storage part does not need to contain a heat insulating material outside.

第１の貯湯部及び第２の貯湯部は、燃料電池によって排出される排熱によって加温された温水を貯湯する。 The first hot water storage section and the second hot water storage section store hot water heated by exhaust heat discharged by the fuel cell.

燃料電池の排熱を受け取った熱媒体と、第１の貯湯部及び／又は第２の貯湯部に貯湯される温水との熱交換によって、第１の貯湯部及び／又は第２の貯湯部に貯湯される温水を加温する温水加温部を更に備え、温水加温部は、第１の貯湯部に貯湯された温水を第２の貯湯部よりも先に加温し、第１の貯湯部に貯湯された温水を加温した後に第２の貯湯部に貯湯された温水を加温する。 By the heat exchange between the heat medium that has received the exhaust heat of the fuel cell and the hot water stored in the first hot water storage section and / or the second hot water storage section, the first hot water storage section and / or the second hot water storage section. A hot water warming section for warming hot water to be stored is further provided, and the warm water warming section warms the hot water stored in the first hot water storage section before the second hot water storage section. After warming the hot water stored in the hot water, the hot water stored in the second hot water storage is heated.

第１の貯湯部に温水を更に貯湯できないことを条件として、第２の貯湯部に貯湯された温水を温水加温部により加温する制御部を更に備える。 A control unit is further provided that heats the hot water stored in the second hot water storage unit by the hot water heating unit on condition that the hot water cannot be further stored in the first hot water storage unit.

第２の貯湯部に貯湯された温水を温水加温部に導いて加温し、加温された温水を第１の貯湯部に供給する加温配管を更に備える。 The warm water stored in the 2nd hot water storage part is further guide | induced to a warm water heating part, and it is further provided with the heating piping which supplies the warm water warmed to the 1st hot water storage part.

温水加温部は、第１の貯湯部及び第２の貯湯部のそれぞれに貯湯された温水を加温すべく、第１の貯湯部及び第２の貯湯部のそれぞれに設けられており、燃料電池の排熱により加温された熱媒体を、第１の貯湯部に設けられた温水加温部に導いて第１の貯湯部に貯湯される温水を加温した後に、第２の貯湯部に設けられた温水加温部に導いて第２の貯湯部に貯湯される温水を加温する貯湯配管を更に備える。 The hot water warming section is provided in each of the first hot water storage section and the second hot water storage section to warm the hot water stored in each of the first hot water storage section and the second hot water storage section. After the heating medium heated by the exhaust heat of the battery is guided to the hot water heating section provided in the first hot water storage section, the hot water stored in the first hot water storage section is heated, and then the second hot water storage section And a hot water storage pipe for heating the hot water stored in the second hot water storage section by guiding to the hot water heating section provided in the hot water storage section.

第１の貯湯部及び第２の貯湯部は独立した貯湯槽である。 The first hot water storage section and the second hot water storage section are independent hot water storage tanks.

なお上記の発明の概要は、本発明の必要な特徴の全てを列挙したものではなく、これらの特徴群のサブコンビネーションもまた発明となりうる。 Note that the above summary of the invention does not enumerate all the necessary features of the present invention, and sub-combinations of these feature groups can also be the invention.

本発明によれば、燃料電池の排熱を利用して温水を生成して貯湯しつつ、燃料電池を安定的に冷却することができる貯湯システムを提供することができる。 ADVANTAGE OF THE INVENTION According to this invention, the hot water storage system which can cool a fuel cell stably can be provided, producing | generating hot water using the waste heat of a fuel cell, and storing hot water.

以下、発明の実施形態を通じて本発明を説明するが、以下の実施形態は特許請求の範囲に係る発明を限定するものではなく、また実施形態の中で説明されている特徴の組み合わせの全てが発明の解決手段に必須であるとは限らない。 Hereinafter, the present invention will be described through embodiments of the invention. However, the following embodiments do not limit the claimed invention, and all combinations of features described in the embodiments are inventions. It is not always essential to the solution.

図１は、本発明の一実施形態に係る建物１１０を示す。本実施形態の建物１１０は、燃料電池収納室７４、排気部５２、燃料電池４０、貯湯空間４８、および連結部材６６を備える。 FIG. 1 shows a building 110 according to an embodiment of the present invention. The building 110 of this embodiment includes a fuel cell storage chamber 74, an exhaust part 52, a fuel cell 40, a hot water storage space 48, and a connecting member 66.

燃料電池収納室７４は、燃料電池４０を内部に収納すべく設けられている。具体的には、燃料電池収納室７４は、建物１１０のテラス６８の内部に設けられる。燃料電池４０は燃料電池収納室７４の内部に設置される。なお、ここでいうテラス６８とは、バルコニー、ベランダなどを含む構造物であってよい。 The fuel cell storage chamber 74 is provided to store the fuel cell 40 therein. Specifically, the fuel cell storage chamber 74 is provided inside the terrace 68 of the building 110. The fuel cell 40 is installed inside the fuel cell storage chamber 74. Here, the terrace 68 may be a structure including a balcony and a veranda.

燃料電池４０は水素を消費して発電する。具体的には、燃料電池４０は、固体高分子形燃料電池（ＰＥＦＣ）であってよい。また、燃料電池４０は、都市ガス、プロパンガスなどを改質して水素ガスを生成する改質器から供給される水素ガスを燃料として発電してよく、また外部から供給される水素ガスを燃料として発電してもよい。そして、燃料電池４０は、アノードにおいて発電に利用されずに排出された水素を含むガス、または当該ガスを改質器で燃焼させることによって生成される燃焼ガスを、排気口５４から排ガスとして排気する。なお、燃料電池４０は、改質器を含む燃料電池であってよく、改質器を含まない燃料電池であってもよい。 The fuel cell 40 consumes hydrogen to generate power. Specifically, the fuel cell 40 may be a polymer electrolyte fuel cell (PEFC). The fuel cell 40 may generate electricity using hydrogen gas supplied from a reformer that generates hydrogen gas by reforming city gas, propane gas, or the like, and uses hydrogen gas supplied from the outside as fuel. You may generate electricity. Then, the fuel cell 40 exhausts the gas containing hydrogen discharged without being used for power generation at the anode or the combustion gas generated by burning the gas in the reformer as exhaust gas from the exhaust port 54. . The fuel cell 40 may be a fuel cell including a reformer, or may be a fuel cell not including a reformer.

排気部５２は、燃料電池４０からの排ガスを建物１１０の外部に直接排気すべく、燃料電池４０からの排ガスを排気する排気口５４に対向する位置に設けられ、排気口５４に連結されている。図１の例では、排気部５２はテラス６８の腰壁７２の壁面に設けられる。 The exhaust unit 52 is provided at a position facing the exhaust port 54 for exhausting the exhaust gas from the fuel cell 40 so as to exhaust the exhaust gas from the fuel cell 40 directly to the outside of the building 110, and is connected to the exhaust port 54. . In the example of FIG. 1, the exhaust part 52 is provided on the wall surface of the waist wall 72 of the terrace 68.

このため、燃料電池４０の排ガスを建物１１０から外部に適切に排気することができる。したがって、燃料電池４０の排ガスが居住空間に侵入することを防ぐことができる。なお、排気部５２の下方には、建物１１０の外部から空気を取り入れて燃料電池４０に給気する給気部５３が設けられている。給気部５３を排気部５２の下方に設けることによって、排気部５２からの排ガスが燃料電池４０に吸入される量を低減することができる。 For this reason, the exhaust gas of the fuel cell 40 can be appropriately exhausted from the building 110 to the outside. Therefore, the exhaust gas of the fuel cell 40 can be prevented from entering the living space. Note that an air supply unit 53 that takes in air from the outside of the building 110 and supplies the air to the fuel cell 40 is provided below the exhaust unit 52. By providing the air supply unit 53 below the exhaust unit 52, the amount of exhaust gas from the exhaust unit 52 taken into the fuel cell 40 can be reduced.

なお、排気部５２および給気部５３のそれぞれには、雨水等の水が外部から浸入することを防ぐウェザーカバー５１が、建物１１０の外部への開口部から外に向かって延設されている。また、排気部５２は、燃料電池４０の排ガスに含まれる水蒸気等によって排気部５２の排気経路の壁面に発生した露を建物１１０の外部に排出する構造を有している。例えば、排気部５２の底部は、排気口５４から建物１１０の外部に向けて下り勾配で傾斜している。他にも、排気部５２の排気経路全体が、建物１１０の外部に向けて下り勾配で傾斜していてもよい。また、排気部５２における排気経路の壁面は、排気部５２の底部に露が集まる形状、例えば円筒形状になっている。そして、排気部５２と排気口５４との接続部分には、排気口５４から燃料電池４０への水の流入を防止する逆流防止板５５が設けられている。このため、外部から雨水等の水が排気部５２または給気部５３を通って燃料電池４０に浸入したり、排気部５２の内壁に付着した露が燃料電池４０に浸入したりすることによって燃料電池４０が故障する確率を低減することができる。 In addition, in each of the exhaust part 52 and the air supply part 53, the weather cover 51 which prevents water, such as rain water, permeating from the outside is extended outward from the opening part to the exterior of the building 110. . Further, the exhaust part 52 has a structure in which dew generated on the wall surface of the exhaust path of the exhaust part 52 due to water vapor or the like contained in the exhaust gas of the fuel cell 40 is discharged to the outside of the building 110. For example, the bottom of the exhaust part 52 is inclined downwardly from the exhaust port 54 toward the outside of the building 110. In addition, the entire exhaust path of the exhaust unit 52 may be inclined downward toward the outside of the building 110. The wall surface of the exhaust path in the exhaust part 52 has a shape in which dew collects at the bottom of the exhaust part 52, for example, a cylindrical shape. Further, a backflow prevention plate 55 that prevents the inflow of water from the exhaust port 54 to the fuel cell 40 is provided at a connection portion between the exhaust unit 52 and the exhaust port 54. For this reason, water such as rainwater enters the fuel cell 40 from the outside through the exhaust part 52 or the air supply part 53, or the dew adhering to the inner wall of the exhaust part 52 enters the fuel cell 40. The probability that the battery 40 will fail can be reduced.

また、燃料電池４０は、発電に伴って発電セルから発熱する。また、燃料電池４０が改質器を有する場合には、燃料電池４０は改質器において利用されなかった熱を排出する。貯湯空間４８は、燃料電池４０の排熱によって加温された温水を貯湯すべく、建物１１０の壁の内部に設けられる。具体的には、排熱配管８６は燃料電池４０および貯湯空間４８に接続され、燃料電池４０を冷却する冷却水として貯湯空間４８の温水を通流させる。そして排熱配管８６の温水は、排熱ポンプ９９によって貯湯空間４８と燃料電池４０との間を循環する。 Further, the fuel cell 40 generates heat from the power generation cell along with power generation. When the fuel cell 40 has a reformer, the fuel cell 40 discharges heat that was not used in the reformer. The hot water storage space 48 is provided inside the wall of the building 110 in order to store hot water heated by the exhaust heat of the fuel cell 40. Specifically, the exhaust heat pipe 86 is connected to the fuel cell 40 and the hot water storage space 48 and allows hot water in the hot water storage space 48 to flow as cooling water for cooling the fuel cell 40. The hot water in the exhaust heat pipe 86 is circulated between the hot water storage space 48 and the fuel cell 40 by the exhaust heat pump 99.

以上説明した建物１１０によれば、燃料電池４０の排熱によって加温された温水を貯湯する貯湯空間４８および燃料電池４０を内部に収納するので、燃料電池４０および貯湯空間４８は住民の活動の邪魔にならない位置に設置することができる。 According to the building 110 described above, since the hot water storage space 48 for storing hot water heated by the exhaust heat of the fuel cell 40 and the fuel cell 40 are housed inside, the fuel cell 40 and the hot water storage space 48 are used for residents' activities. It can be installed in an unobstructed position.

なお、燃料電池収納室７４は、貯湯空間４８に貯湯される温水の下面よりも更に下方に燃料電池４０を設置することができる位置に設けられる。具体的には、燃料電池収納室７４は、建物１１０のテラス６８の床面７３の下部に設けられる。このため、貯湯空間４８に熱量を供給する排熱ポンプ９９が動作を停止した場合でも、貯湯空間４８の下部の水によって燃料電池４０を冷却することができる。 The fuel cell storage chamber 74 is provided at a position where the fuel cell 40 can be installed further below the lower surface of the hot water stored in the hot water storage space 48. Specifically, the fuel cell storage chamber 74 is provided below the floor surface 73 of the terrace 68 of the building 110. For this reason, even when the exhaust heat pump 99 that supplies heat to the hot water storage space 48 stops operating, the fuel cell 40 can be cooled by the water below the hot water storage space 48.

そして、貯湯空間４８は、壁の壁面と略平行な第１の側面６２ａと、第１の側面６２ａに対向する第２の側面６２ｂとを有する。そして、連結部材６６は、第１の側面６２ａと第２の側面６２ｂとを連結し、かつ貯湯空間４８を複数の部分空間（４６aおよび４６ｂ）に分割する。このため、連結部材６６によって腰壁７２の強度を保ちつつ、腰壁７２の内部に貯湯空間４８を設けることができる。なお、貯湯空間４８には、複数の連結部材６６が設けられてもよい。そして、連結部材６６は、当該連結部材６６の上方に位置する部分空間４６aの下部と、当該連結部材６６の下方に位置する部分空間４６ｂの上部とを連通する連通口４２を有する。 And the hot water storage space 48 has the 1st side surface 62a substantially parallel to the wall surface of a wall, and the 2nd side surface 62b facing the 1st side surface 62a. The connecting member 66 connects the first side face 62a and the second side face 62b, and divides the hot water storage space 48 into a plurality of partial spaces (46a and 46b). For this reason, the hot water storage space 48 can be provided inside the waist wall 72 while maintaining the strength of the waist wall 72 by the connecting member 66. A plurality of connecting members 66 may be provided in the hot water storage space 48. The connecting member 66 has a communication port 42 that communicates the lower part of the partial space 46 a located above the connecting member 66 and the upper part of the partial space 46 b located below the connecting member 66.

貯湯空間４８に温水を貯湯すると、貯湯される温水が高温部と低温部とに分かれて両者の比重差により温度境界層が生じる。この温度境界層の厚さは、貯湯空間４８の横長、縦長にかかわらず略同一となる。したがって、貯湯空間が横長になると、水平方向の断面積が大きい分、温度境界層の容積が大きくなる。そして、この温度境界層を通して高温部から低温部への熱移動により高温部の温度低下も大きくなるので、蓄熱効率が低下してしまう。しかし、本実施形態の建物１１０における貯湯空間４８においては、連結部材６６は連通口４２を有することによってより縦長の空間を形成することができる。このため、腰壁７２の強度を確保しつつ蓄熱効率をより高めることができる。 When hot water is stored in the hot water storage space 48, the hot water stored is divided into a high temperature portion and a low temperature portion, and a temperature boundary layer is generated due to the difference in specific gravity between the two. The thickness of this temperature boundary layer is substantially the same regardless of whether the hot water storage space 48 is horizontally long or vertically long. Therefore, when the hot water storage space is horizontally long, the volume of the temperature boundary layer increases as the horizontal sectional area increases. And since the temperature fall of a high temperature part also becomes large by the heat transfer from a high temperature part to a low temperature part through this temperature boundary layer, heat storage efficiency will fall. However, in the hot water storage space 48 in the building 110 of the present embodiment, the connecting member 66 can form a longer space by having the communication port 42. For this reason, the heat storage efficiency can be further increased while ensuring the strength of the waist wall 72.

なお、連結部材６６は、具体的には略水平に設けられる。そして、連結部材６６の上方に位置する部分空間４６aは、連結部材６６の下方に位置する部分空間４６ｂより高い温度の温水を貯湯する。具体的には、複数の部分空間４６のうち、部分空間４６ａに貯湯される温水を、部分空間４６ａよりも下方に位置する部分空間４６よりも先に熱源からの熱量を用いて加温し、部分空間４６ａに貯湯される温水を加温した後に、部分空間４６ａよりも下方に位置する部分空間４６ｂを加温する。例えば、部分空間４６ｂの下部の温水を、燃料電池４０を冷却する冷却水として燃料電池４０に供給する。そして、燃料電池４０において加温されて得られる温水を部分空間４６ａの上部から供給する。 Specifically, the connecting member 66 is provided substantially horizontally. The partial space 46 a located above the connecting member 66 stores hot water having a temperature higher than that of the partial space 46 b located below the connecting member 66. Specifically, among the plurality of partial spaces 46, warm water stored in the partial space 46a is heated using the amount of heat from the heat source prior to the partial space 46 positioned below the partial space 46a. After warming the hot water stored in the partial space 46a, the partial space 46b located below the partial space 46a is heated. For example, hot water in the lower part of the partial space 46 b is supplied to the fuel cell 40 as cooling water for cooling the fuel cell 40. And the warm water obtained by heating in the fuel cell 40 is supplied from the upper part of the partial space 46a.

なお、貯湯空間４８は、貯湯空間４８の外部と断熱されているのが望ましい。例えば、貯湯空間４８は、貯湯空間４８と貯湯空間４８の外部とを断熱する建築部材によって形成されてよい。他にも、貯湯空間４８と貯湯空間４８の外部とを断熱する断熱材が、貯湯空間４８の周囲に設けられてもよい。 The hot water storage space 48 is preferably insulated from the outside of the hot water storage space 48. For example, the hot water storage space 48 may be formed by a building member that insulates the hot water storage space 48 and the outside of the hot water storage space 48. In addition, a heat insulating material that insulates the hot water storage space 48 and the outside of the hot water storage space 48 may be provided around the hot water storage space 48.

以上説明したように、建物１１０の内部に燃料電池４０を収納するとともに、燃料電池４０の排熱を用いて生成された温水を建物１１０の内部に効率よく貯湯することができる。なお、燃料電池収納室７４は、建物１１０の床下、天井、階段の下方の空間などであってよい。 As described above, the fuel cell 40 can be housed in the building 110, and hot water generated using the exhaust heat of the fuel cell 40 can be efficiently stored in the building 110. The fuel cell storage chamber 74 may be a space below the floor of the building 110, a ceiling, a space below a staircase, or the like.

図２は、建物の壁となる壁部材６４の一例を示す。壁部材６４は、例えば図１において説明した腰壁７２などの、建物１１０の建造に用いられる部材であってよい。壁部材６４は、貯湯空間４８、連結部材６６、および断熱材６０を備える。貯湯空間４８は、壁部材６４の内部に設けられ、温水を貯湯する。貯湯空間４８の周囲には、断熱材６０が設けられている。 FIG. 2 shows an example of a wall member 64 that becomes a wall of a building. The wall member 64 may be a member used for construction of the building 110 such as the waist wall 72 described in FIG. The wall member 64 includes a hot water storage space 48, a connecting member 66, and a heat insulating material 60. The hot water storage space 48 is provided inside the wall member 64 and stores hot water. A heat insulating material 60 is provided around the hot water storage space 48.

貯湯空間４８は、壁部材６４の壁面と略平行な第１の側面６２ａと、第１の側面６２ａに対向する第２の側面６２ｂとを有する。そして、連結部材６６は、第１の側面６２ａと第２の側面６２ｂとを連結し、かつ貯湯空間４８を複数の部分空間（４６aおよび４６ｂ）に分割する。 The hot water storage space 48 includes a first side surface 62a that is substantially parallel to the wall surface of the wall member 64, and a second side surface 62b that faces the first side surface 62a. The connecting member 66 connects the first side face 62a and the second side face 62b, and divides the hot water storage space 48 into a plurality of partial spaces (46a and 46b).

なお、連結部材６６は略水平に設けられている。また、連結部材６６は、当該連結部材６６の上方に位置する部分空間４６aの下部と、当該連結部材６６の下方に位置する部分空間４６ｂの上部とを連通する連通口４２を有する。本実施形態においては、連結部材６６は連通口４２を有することによって、連通口４２を有しない場合に比べて縦長の貯湯空間４８を形成することができる。このため、腰壁７２の強度を確保しつつ、蓄熱効率をより高めることができる。 The connecting member 66 is provided substantially horizontally. In addition, the connecting member 66 has a communication port 42 that communicates the lower part of the partial space 46 a located above the connecting member 66 and the upper part of the partial space 46 b located below the connecting member 66. In the present embodiment, the connecting member 66 has the communication port 42, so that a vertically long hot water storage space 48 can be formed as compared to the case where the communication port 42 is not provided. For this reason, the heat storage efficiency can be further enhanced while ensuring the strength of the waist wall 72.

また、断熱材６０は、建物１１０を断熱する部材として機能するとともに、貯湯空間４８を断熱する部材としても機能させることができる。また、内部に水が蓄えられる壁部材６４を建物１１０の壁として用いることによって、建物１１０の耐火性をより高めることができる。 The heat insulating material 60 can function as a member that insulates the building 110 and also functions as a member that insulates the hot water storage space 48. Moreover, by using the wall member 64 in which water is stored as the wall of the building 110, the fire resistance of the building 110 can be further improved.

図３は、壁部材６４の変形例を示す。本変形例における壁部材６４は、貯湯空間４８、連結部材６６、および断熱材６０を備える。貯湯空間４８は、壁部材６４の壁面と略平行な第１の側面６２ａと、第１の側面６２ａに対向する第２の側面６２ｂとを有する。なお、本変形例における断熱材６０は、図２で説明した断熱材６０と同一の機能を有するので説明を省略する。 FIG. 3 shows a modification of the wall member 64. The wall member 64 in this modification includes a hot water storage space 48, a connecting member 66, and a heat insulating material 60. The hot water storage space 48 includes a first side surface 62a that is substantially parallel to the wall surface of the wall member 64, and a second side surface 62b that faces the first side surface 62a. In addition, since the heat insulating material 60 in this modification has the same function as the heat insulating material 60 demonstrated in FIG. 2, description is abbreviate | omitted.

本変形例の壁部材６４においては、第１の側面６２ａおよび第２の側面６２ｂは矩形状である。そして、連結部材６６は、貯湯空間４８において第１の側面６２ａまたは第２の側面６２ｂの矩形の対角を結ぶ方向に設けられる。連結部材６６により、貯湯空間４８は複数の部分空間（４６aおよび４６ｂ）に分割される。そして、連結部材６６は、部分空間４６aおよび部分空間４６ｂを連結する連通口４２を有する。なお、連結部材６６は、本変形例の壁部材６４が壁となる建物を補強する筋交いであってよい。 In the wall member 64 of this modification, the first side surface 62a and the second side surface 62b are rectangular. The connecting member 66 is provided in the hot water storage space 48 in a direction connecting the diagonal corners of the first side surface 62a or the second side surface 62b. The hot water storage space 48 is divided into a plurality of partial spaces (46a and 46b) by the connecting member 66. And the connection member 66 has the communicating port 42 which connects the partial space 46a and the partial space 46b. The connecting member 66 may be a brace that reinforces the building in which the wall member 64 of the present modification is a wall.

本変形例の壁部材６４によると、第１の側面６２ａおよび第２の側面６２ｂをより強固に連結することができる。したがって、壁部材６４の強度をより高めることができる。また、本変形例の壁部材６４における連結部材６６には、壁部材６４が壁となる建物を補強する筋交いとしての機能を持たせることができる。 According to the wall member 64 of this modification, the first side surface 62a and the second side surface 62b can be more firmly connected. Therefore, the strength of the wall member 64 can be further increased. Further, the connecting member 66 in the wall member 64 of the present modification can have a function as a brace that reinforces the building in which the wall member 64 becomes a wall.

図４は、壁部材６４の更なる変形例を示す。本変形例における壁部材６４は、貯湯空間４８、連結部材６６、および断熱材６０を備える。貯湯空間４８および断熱材６０は、図２で説明した貯湯空間４８および断熱材６０と同一の機能を有するので説明を省略する。本変形例の壁部材６４においては、連結部材６６は壁部材６４として一体に形成されるものであり、第１の側面６２ａと第２の側面６２ｂとを連結し、かつ貯湯空間４８を複数の部分空間（４６aおよび４６ｂ）に分割する。 FIG. 4 shows a further modification of the wall member 64. The wall member 64 in this modification includes a hot water storage space 48, a connecting member 66, and a heat insulating material 60. The hot water storage space 48 and the heat insulating material 60 have the same functions as the hot water storage space 48 and the heat insulating material 60 described in FIG. In the wall member 64 of the present modification, the connecting member 66 is integrally formed as the wall member 64, connects the first side surface 62a and the second side surface 62b, and connects the hot water storage space 48 to a plurality of hot water storage spaces 48. Divide into subspaces (46a and 46b).

図５は、貯湯システム１００の構成の一例を示す。本実施形態の貯湯システム１００は、第１の貯湯部４４ａ、第２の貯湯部４４ｂ、接続配管４３、第１の断熱材６０ａ、第２の断熱材６０ｂ、温水加温部５８、加温配管（５６ａ〜ｃ）、貯湯ポンプ９０、排熱配管８８、排熱ポンプ９８、バルブ９２、バルブ９４、給湯配管８２、燃料電池４０、および制御部５０を備える。なお、燃料電池４０は、図１で説明した燃料電池４０と同様の動作をするので説明を省略する。そして、本実施形態の貯湯システム１００は、例えば図１で説明した建物１１０に温水を貯湯する貯湯システム、または図２から図４にかけて説明した壁部材６４に温水を貯湯する貯湯システムとして機能してもよい。 FIG. 5 shows an example of the configuration of the hot water storage system 100. The hot water storage system 100 of the present embodiment includes a first hot water storage section 44a, a second hot water storage section 44b, a connection pipe 43, a first heat insulating material 60a, a second heat insulating material 60b, a hot water heating section 58, and a warming pipe. (56a to c), hot water storage pump 90, exhaust heat pipe 88, exhaust heat pump 98, valve 92, valve 94, hot water supply pipe 82, fuel cell 40, and control unit 50 are provided. The fuel cell 40 operates in the same manner as the fuel cell 40 described in FIG. The hot water storage system 100 of the present embodiment functions as, for example, a hot water storage system that stores hot water in the building 110 described with reference to FIG. 1 or a hot water storage system that stores hot water in the wall member 64 described with reference to FIGS. Also good.

第１の貯湯部４４ａおよび第２の貯湯部４４ｂは、熱源からの熱量を受け取ることによって加温される温水を貯湯する。具体的には、第１の貯湯部４４ａおよび第２の貯湯部４４ｂは、燃料電池４０によって排出される排熱によって加温された温水を貯湯する。第１の断熱材６０ａは第１の貯湯部４４ａの周囲に設けられている。また、第２の断熱材６０ｂは第２の貯湯部４４ｂの周囲に設けられている。 The 1st hot water storage part 44a and the 2nd hot water storage part 44b store hot water heated by receiving the calorie | heat amount from a heat source. Specifically, the first hot water storage section 44 a and the second hot water storage section 44 b store hot water heated by exhaust heat exhausted by the fuel cell 40. The first heat insulating material 60a is provided around the first hot water storage section 44a. The second heat insulating material 60b is provided around the second hot water storage section 44b.

第２の貯湯部４４ｂは、第１の貯湯部４４ａより低い断熱性を持つ。ここでいう断熱性とは、第１の貯湯部４４ａおよび第２の貯湯部４４ｂから、それぞれ第１の断熱材６０ａおよび第２の断熱材６０ｂの外部の空間への熱貫流抵抗の値を指標とするものであってよい。 The 2nd hot water storage part 44b has heat insulation lower than the 1st hot water storage part 44a. The heat insulation here refers to the value of the heat flow resistance from the first hot water storage portion 44a and the second hot water storage portion 44b to the space outside the first heat insulating material 60a and the second heat insulating material 60b, respectively. It may be.

具体的には、第２の断熱材６０ｂは、第１の断熱材６０ａの断熱性より低い断熱性を持っている。例えば、第２の断熱材６０ｂの厚さは、第１の断熱材６０ａの厚さよりも薄くてよい。また、第２の断熱材６０ｂは、第１の断熱材６０ａよりも低い熱貫流抵抗を持つ部材を含んでもよい。他にも、第１の貯湯部４４ａは、外部に断熱材を有しており、第２の貯湯部４４ｂは、外部に断熱材を含まなくてもよい。例えば第２の貯湯部４４ｂの周囲に第２の断熱材６０ｂが設けられていなくてもよいし、第２の貯湯部４４ｂの周囲の第２の断熱材６０ｂの少なくとも一部に、断熱材が設けられていない部分領域があってもよい。他にも、第２の貯湯部４４ｂの内部に貯湯される温水の体積に対する表面積の比を、第１の貯湯部４４ａの内部に貯湯される温水の体積に対する表面積の比よりも大きくてもよい。 Specifically, the second heat insulating material 60b has a heat insulating property lower than that of the first heat insulating material 60a. For example, the thickness of the second heat insulating material 60b may be thinner than the thickness of the first heat insulating material 60a. Further, the second heat insulating material 60b may include a member having a lower heat flow resistance than the first heat insulating material 60a. In addition, the 1st hot water storage part 44a has a heat insulating material outside, and the 2nd hot water storage part 44b does not need to contain a heat insulating material outside. For example, the second heat insulating material 60b may not be provided around the second hot water storage portion 44b, and at least a part of the second heat insulating material 60b around the second hot water storage portion 44b is provided with a heat insulating material. There may be a partial region that is not provided. In addition, the ratio of the surface area to the volume of hot water stored in the second hot water storage section 44b may be larger than the ratio of the surface area to the volume of hot water stored in the first hot water storage section 44a. .

なお、第１の貯湯部４４ａは、第２の貯湯部４４ｂに貯湯される温水よりも高温の温水を貯湯する。具体的には、第１の貯湯部４４ａは、第２の貯湯部４４ｂより上方に設けられており、第１の貯湯部４４ａの下部と第２の貯湯部４４ｂの上部とは接続配管４３によって接続されている。そして、第１の貯湯部４４ａは、第２の貯湯部４４ｂよりも優先的に熱量を受け取ることによって加温された温水を貯湯する。 In addition, the 1st hot water storage part 44a stores hot water hotter than the hot water stored in the 2nd hot water storage part 44b. Specifically, the first hot water storage part 44a is provided above the second hot water storage part 44b, and the lower part of the first hot water storage part 44a and the upper part of the second hot water storage part 44b are connected by a connection pipe 43. It is connected. And the 1st hot water storage part 44a stores the hot water heated by receiving heat quantity preferentially rather than the 2nd hot water storage part 44b.

具体的には、温水加温部５８は、燃料電池４０の排熱を受け取った熱媒体と、第１の貯湯部４４ａおよび／または第２の貯湯部４４ｂに貯湯される温水との熱交換によって、第１の貯湯部４４ａおよび／または第２の貯湯部４４ｂに貯湯される温水を加温する。そして、温水加温部５８は、第１の貯湯部４４ａに貯湯された温水を第２の貯湯部４４ｂよりも先に加温し、第１の貯湯部４４ａに貯湯された温水を加温した後に第２の貯湯部４４ｂに貯湯された温水を加温する。 Specifically, the hot water heating unit 58 performs heat exchange between the heat medium that has received the exhaust heat of the fuel cell 40 and the hot water stored in the first hot water storage unit 44a and / or the second hot water storage unit 44b. The hot water stored in the first hot water storage section 44a and / or the second hot water storage section 44b is heated. Then, the hot water warming unit 58 warms the hot water stored in the first hot water storage unit 44a before the second hot water storage unit 44b, and warms the hot water stored in the first hot water storage unit 44a. Later, the hot water stored in the second hot water storage section 44b is heated.

具体的には、燃料電池４０から排熱を受け取って冷却する冷却水が、排熱ポンプ９８によって排熱配管８８を通って循環している。そして、温水加温部５８には、第２の貯湯部４４ｂの下部から温水を取り出す加温配管５６aと排熱配管８８とが接続されている。そして、加温配管５６aの温水は、貯湯ポンプ９０によって温水加温部５８に供給され、排熱配管８８を流れる冷却水の熱量を温水加温部５８において受け取って加温されて、第１の貯湯部４４ａに供給される。 Specifically, the cooling water that receives and cools the exhaust heat from the fuel cell 40 is circulated through the exhaust heat pipe 88 by the exhaust heat pump 98. The warm water warming section 58 is connected to a warming pipe 56a for taking out hot water from the lower part of the second hot water storage section 44b and an exhaust heat pipe 88. The warm water in the warming pipe 56a is supplied to the warm water warming part 58 by the hot water storage pump 90, and the warm water warming part 58 receives the amount of heat of the cooling water flowing through the exhaust heat pipe 88 and warms it. It is supplied to the hot water storage section 44a.

また、制御部５０は、第１の貯湯部４４ａに温水を更に貯湯できないことを条件として、第２の貯湯部４４ｂに貯湯された温水を加温配管５６ａに取り出して、温水加温部５８により加温させる。例えば、制御部５０は、第１の貯湯部４４ａに温水を更に貯湯できる場合には、バルブ９４を用いて加温配管５６ｂを加温配管５６ａに連通させることによって、第１の貯湯部４４ａの下部の温水を加温配管５６ｂから取り出して温水加温部５８に導く。そして、温水加温部５８において加温された温水は、第１の貯湯部４４ａの上部から供給される。 Moreover, the control part 50 takes out the warm water stored in the 2nd hot water storage part 44b to the heating piping 56a on condition that the hot water cannot be further stored in the 1st hot water storage part 44a, and the hot water warming part 58 Let warm. For example, when the hot water can be further stored in the first hot water storage unit 44a, the control unit 50 causes the heating pipe 56b to communicate with the warming pipe 56a by using the valve 94, whereby the first hot water storage unit 44a. The lower warm water is taken out from the warming pipe 56 b and led to the warm water warming section 58. And the warm water heated in the warm water warming part 58 is supplied from the upper part of the 1st hot water storage part 44a.

このとき、制御部５０は、第１の貯湯部４４ａの下部の温水の温度を逐次計測して、当該温水の温度が予め定めた温度以上となったことを条件として、第２の貯湯部４４ｂの温水を温水加温部５８により加温させる。具体的には、第２の貯湯部４４ｂの下部から加温配管５６ａに取り出された温水を温水加温部５８に導いて加温する。そして、温水加温部５８において加温された温水は、第１の貯湯部４４ａの上部から第１の貯湯部４４ａに供給される。なお、制御部５０は、バルブ９２を制御して第２の貯湯部４４ｂの上部に接続される加温配管５６ｃとを連通させて、温水加温部５８において加温された温水を第２の貯湯部４４ｂの上部に供給してもよい。 At this time, the control unit 50 sequentially measures the temperature of the hot water in the lower part of the first hot water storage unit 44a, and on the condition that the temperature of the hot water is equal to or higher than a predetermined temperature, the second hot water storage unit 44b. The warm water is warmed by the warm water warming section 58. Specifically, the hot water taken out from the lower part of the second hot water storage unit 44b to the heating pipe 56a is guided to the hot water heating unit 58 to be heated. And the warm water heated in the warm water heating part 58 is supplied to the 1st hot water storage part 44a from the upper part of the 1st hot water storage part 44a. The control unit 50 controls the valve 92 so as to communicate with the heating pipe 56c connected to the upper part of the second hot water storage unit 44b, and the hot water heated by the hot water heating unit 58 is supplied to the second hot water storage unit 58. You may supply to the upper part of the hot water storage part 44b.

なお、第１の貯湯部４４ａおよび第２の貯湯部４４ｂは独立した貯湯槽であってよい。例えば、集合住宅の複数の階に貯湯槽が設けられている場合において、一の階に設けられた貯湯槽を貯湯システム１００の第１の貯湯部４４ａとして機能させ、当該貯湯槽よりも下の階に設けられた貯湯槽を貯湯システム１００の第２の貯湯部４４ｂとして機能させてよい。 In addition, the 1st hot water storage part 44a and the 2nd hot water storage part 44b may be independent hot water storage tanks. For example, in the case where hot water storage tanks are provided on a plurality of floors of an apartment house, the hot water storage tank provided on the first floor functions as the first hot water storage section 44a of the hot water storage system 100, and is located below the hot water storage tank. The hot water storage tank provided on the floor may function as the second hot water storage section 44 b of the hot water storage system 100.

なお、第１の貯湯部４４ａに貯湯された温水は、給湯配管８２によって給湯需要に給湯される。また、給湯需要によって温水が消費された場合、消費された量の市水が第２の貯湯部４４ｂの下部から供給される。 The hot water stored in the first hot water storage section 44a is supplied to the hot water supply demand through the hot water supply pipe 82. When hot water is consumed due to demand for hot water supply, the consumed amount of city water is supplied from the lower part of the second hot water storage section 44b.

本実施形態の貯湯システム１００によれば、例えば第１の貯湯部４４ａが規定温度の温水で満杯になった場合など、第１の貯湯部４４ａに燃料電池４０の排熱を提供できない場合でも、燃料電池４０の排熱を第２の貯湯部４４ｂに提供することができる。したがって、排熱配管８８を流れる冷却水が第１の貯湯部４４ａの温水によって十分に冷却されない場合でも、第２の貯湯部４４ｂの温水によって冷却水を冷却することができる。したがって、燃料電池４０の冷却不足によって燃料電池４０の運転が停止される頻度を低減することができる。 According to the hot water storage system 100 of the present embodiment, for example, when the first hot water storage section 44a is filled with warm water of a specified temperature, even when the exhaust heat of the fuel cell 40 cannot be provided to the first hot water storage section 44a, The exhaust heat of the fuel cell 40 can be provided to the second hot water storage section 44b. Therefore, even when the cooling water flowing through the exhaust heat pipe 88 is not sufficiently cooled by the hot water in the first hot water storage section 44a, the cooling water can be cooled by the hot water in the second hot water storage section 44b. Therefore, the frequency with which the operation of the fuel cell 40 is stopped due to insufficient cooling of the fuel cell 40 can be reduced.

図６は、貯湯システム１００の変形例を示す。本変形例の貯湯システム１００は、第１の貯湯部４４ａ、第２の貯湯部４４ｂ、接続配管４３、第１の断熱材６０ａ、第２の断熱材６０ｂ、温水加温部５８、加温配管（５７ａおよび５７ｂ）、貯湯ポンプ（９１ａおよび９１ｂ）、排熱配管８８、排熱ポンプ９８、給湯配管８２、燃料電池４０、および制御部５０を備える。加温配管５７ａは第１の貯湯部４４ａの下部と第１の貯湯部４４ａの上部とを接続する。また、加温配管５７ｂは、第２の貯湯部４４ｂの下部と第２の貯湯部４４ｂの上部とを接続する。なお、本変形例の貯湯システム１００の構成要素のうち、図５における貯湯システム１００の構成要素と同一の符号が付された構成要素は、当該同一の符号が付された構成要素と同一の機能を有するので説明を省略する。 FIG. 6 shows a modification of the hot water storage system 100. The hot water storage system 100 of the present modification includes a first hot water storage section 44a, a second hot water storage section 44b, a connection pipe 43, a first heat insulating material 60a, a second heat insulating material 60b, a hot water heating section 58, and a warming pipe. (57a and 57b), a hot water storage pump (91a and 91b), an exhaust heat pipe 88, an exhaust heat pump 98, a hot water supply pipe 82, the fuel cell 40, and the control unit 50. The heating pipe 57a connects the lower part of the first hot water storage part 44a and the upper part of the first hot water storage part 44a. The heating pipe 57b connects the lower part of the second hot water storage part 44b and the upper part of the second hot water storage part 44b. Note that, among the components of the hot water storage system 100 according to the present modification, components having the same reference numerals as those of the hot water storage system 100 in FIG. 5 have the same functions as the components having the same reference numerals. The description is omitted.

そして、加温配管５７ａは温水加温部５８に接続されており、第１の貯湯部４４ａの下部から取り出された温水を、貯湯ポンプ９１ａによって温水加温部５８を通過させて加温した後に第１の貯湯部４４ａの上部から供給する。また、加温配管５７ｂは温水加温部５８に接続されており、第２の貯湯部４４ｂの下部から取り出された温水を、貯湯ポンプ９１ｂによって温水加温部５８を通過させて加温した後に、第２の貯湯部４４ｂの上部から供給する。このとき、温水加温部５８は、排熱配管８８を通流する冷却水の熱量を加温配管５７ｂの温水よりも先に加温配管５７ａの温水に提供する。 The warming pipe 57a is connected to the warm water warming part 58, and the warm water taken out from the lower part of the first hot water storage part 44a is heated by passing through the warm water warming part 58 by the hot water storage pump 91a. It supplies from the upper part of the 1st hot water storage part 44a. The warming pipe 57b is connected to the warm water warming part 58, and warm water taken from the lower part of the second hot water storage part 44b is passed through the warm water warming part 58 by the hot water storage pump 91b and heated. , Supplied from the upper part of the second hot water storage section 44b. At this time, the warm water warming unit 58 provides the amount of heat of the cooling water flowing through the exhaust heat pipe 88 to the warm water in the warm pipe 57a before the warm water in the warm pipe 57b.

本変形例の貯湯システム１００によれば、例えば第１の貯湯部４４ａが温水で満杯になった場合など、第１の貯湯部４４ａに燃料電池４０の排熱を提供できない場合には、燃料電池４０の排熱は自動的に第２の貯湯部４４ｂに提供される。そして、排熱配管８８を流れる冷却水が温水加温部５８において第１の貯湯部４４ａの下部の温水によって十分に冷却されない場合でも、第２の貯湯部４４ｂの下部の温水によって冷却水を冷却することができる。したがって、燃料電池４０の冷却不足によって燃料電池４０が運転を停止する頻度を低減することができる。 According to the hot water storage system 100 of the present modified example, when the exhaust heat of the fuel cell 40 cannot be provided to the first hot water storage section 44a, for example, when the first hot water storage section 44a is filled with hot water, the fuel cell The exhaust heat of 40 is automatically provided to the second hot water storage section 44b. Even when the cooling water flowing through the exhaust heat pipe 88 is not sufficiently cooled by the hot water at the lower part of the first hot water storage part 44a in the hot water heating part 58, the cooling water is cooled by the hot water at the lower part of the second hot water storage part 44b. can do. Therefore, the frequency with which the fuel cell 40 stops operation due to insufficient cooling of the fuel cell 40 can be reduced.

図７は、貯湯システム１００の更なる変形例を示す。貯湯システム１００は、第１の貯湯部４４ａ、第２の貯湯部４４ｂ、接続配管４３、第１の断熱材６０ａ、第２の断熱材６０ｂ、温水加温部（５８ａおよび５８ｂ）、排熱配管８８、排熱ポンプ９８、および給湯配管８２を備える。なお、本変形例の貯湯システム１００の構成要素のうち、図５の貯湯システム１００において同一の符号が付された構成要素は、当該同一の符号が付された構成要素とそれぞれ同一の機能を有するので説明を省略する。 FIG. 7 shows a further modification of the hot water storage system 100. The hot water storage system 100 includes a first hot water storage section 44a, a second hot water storage section 44b, a connection pipe 43, a first heat insulating material 60a, a second heat insulating material 60b, a hot water heating section (58a and 58b), and an exhaust heat pipe. 88, a waste heat pump 98, and a hot water supply pipe 82. Note that, among the components of the hot water storage system 100 of the present modification, the components denoted by the same reference numerals in the hot water storage system 100 of FIG. 5 have the same functions as the components denoted by the same reference numerals. Therefore, explanation is omitted.

温水加温部５８ａは、第１の貯湯部４４ａに貯湯された温水を加温すべく、第１の貯湯部４４ａの下部に設けられている。また、温水加温部５８ｂは、第２の貯湯部４４ｂに貯湯された温水を加温すべく、第２の貯湯部４４ｂの下部に設けられている。そして、排熱配管８８は、温水加温部５８ａおよび温水加温部５８ｂを直列的に接続している。排熱配管８８の内部においては、燃料電池４０の排熱により加温された熱媒体が排熱ポンプ９８によって循環している。そして、排熱配管８８は、燃料電池４０の排熱により加温された熱媒体を、第１の貯湯部４４ａに設けられた温水加温部５８aに導いて第１の貯湯部４４ａに貯湯される温水を加温した後に、第２の貯湯部４４ｂに設けられた温水加温部５８ｂに導いて第２の貯湯部４４ｂに貯湯される温水を加温する。 The hot water warming part 58a is provided in the lower part of the 1st hot water storage part 44a in order to heat the hot water stored in the 1st hot water storage part 44a. The hot water warming part 58b is provided below the second hot water storage part 44b in order to warm the hot water stored in the second hot water storage part 44b. And the exhaust heat piping 88 has connected the warm water warming part 58a and the warm water warming part 58b in series. Inside the exhaust heat pipe 88, the heat medium heated by the exhaust heat of the fuel cell 40 is circulated by the exhaust heat pump 98. The exhaust heat pipe 88 guides the heat medium heated by the exhaust heat of the fuel cell 40 to the hot water heating section 58a provided in the first hot water storage section 44a, and is stored in the first hot water storage section 44a. After the warm water is heated, the hot water stored in the second hot water storage section 44b is heated by being guided to the hot water warming section 58b provided in the second hot water storage section 44b.

本変形例の貯湯システム１００によれば、例えば第１の貯湯部４４ａが温水で満杯になった場合など、第１の貯湯部４４ａに燃料電池４０の排熱を提供できない場合には、燃料電池４０の排熱は自動的に第２の貯湯部４４ｂに提供される。また、排熱配管８８を流れる冷却水が第１の貯湯部４４ａの下部の温水によって十分に冷却されない場合でも、第２の貯湯部４４ｂの下部の温水によって冷却水を冷却することができる。したがって、燃料電池４０の冷却不足によって燃料電池４０が運転を停止する頻度を低減することができる。 According to the hot water storage system 100 of the present modified example, when the exhaust heat of the fuel cell 40 cannot be provided to the first hot water storage section 44a, for example, when the first hot water storage section 44a is filled with hot water, the fuel cell The exhaust heat of 40 is automatically provided to the second hot water storage section 44b. Further, even when the cooling water flowing through the exhaust heat pipe 88 is not sufficiently cooled by the hot water in the lower part of the first hot water storage part 44a, the cooling water can be cooled by the hot water in the lower part of the second hot water storage part 44b. Therefore, the frequency with which the fuel cell 40 stops operation due to insufficient cooling of the fuel cell 40 can be reduced.

なお、図５から図７にかけて説明した貯湯システム１００は、図１で説明した建物１１０に温水を貯湯する貯湯システム、または図２から図４にかけて説明した壁部材６４に温水を貯湯する貯湯システムとして機能させてもよい。例えば、図５から図６にかけて説明した貯湯システム１００における第１の貯湯部４４ａ、第２の貯湯部４４ｂ、および接続配管４３を、それぞれ図１から図４にかけて説明した建物１１０または壁部材６４における部分空間４６a、部分空間４６ｂ、および連通口４２として機能させてよい。また、貯湯システム１００における第１の断熱材６０aおよび第２の断熱材６０ｂを、図２から図４にかけて説明した壁部材６４における断熱材６０として機能させてもよい。 The hot water storage system 100 described with reference to FIGS. 5 to 7 is a hot water storage system that stores hot water in the building 110 described with reference to FIG. 1 or a hot water storage system that stores hot water with the wall member 64 described with reference to FIGS. May function. For example, the first hot water storage section 44a, the second hot water storage section 44b, and the connection pipe 43 in the hot water storage system 100 described with reference to FIGS. 5 to 6 are respectively connected to the building 110 or the wall member 64 described with reference to FIGS. The partial space 46a, the partial space 46b, and the communication port 42 may function. In addition, the first heat insulating material 60a and the second heat insulating material 60b in the hot water storage system 100 may function as the heat insulating material 60 in the wall member 64 described with reference to FIGS.

図８は、建物１１０における燃料電池収納室７４の配置の他の一例を示す。本例の建物１１０は、燃料電池収納室７４、燃料電池４０、および排気部５２の位置を除いて図１で説明した建物１１０と同一である。燃料電池収納室７４は、建物１１０のテラス６８の壁面に設けられており、燃料電池収納室７４内に燃料電池４０が設置されている。そして、テラス６８の壁面に設けられた排気部５２は、燃料電池４０からの排ガスを建物１１０の外部に直接排気すべく、燃料電池４０からの排ガスを排気する排気口５４に対向する位置に設けられ、かつ、排気口５４に連結されている。なお、燃料電池収納室７４は、テラス６８の壁面の他に、建造物の基礎の壁面などに設けられてもよい。なお、燃料電池収納室７４は、例えば建物１１０の基礎で囲まれる床下空間であってもよい。 FIG. 8 shows another example of the arrangement of the fuel cell storage chamber 74 in the building 110. The building 110 in this example is the same as the building 110 described in FIG. 1 except for the positions of the fuel cell storage chamber 74, the fuel cell 40, and the exhaust part 52. The fuel cell storage chamber 74 is provided on the wall surface of the terrace 68 of the building 110, and the fuel cell 40 is installed in the fuel cell storage chamber 74. And the exhaust part 52 provided in the wall surface of the terrace 68 is provided in the position which opposes the exhaust port 54 which exhausts the exhaust gas from the fuel cell 40, in order to exhaust the exhaust gas from the fuel cell 40 directly to the exterior of the building 110. And connected to the exhaust port 54. In addition to the wall surface of the terrace 68, the fuel cell storage chamber 74 may be provided on the wall surface of the foundation of the building. The fuel cell storage chamber 74 may be an underfloor space surrounded by the foundation of the building 110, for example.

図９は、建物１１０の変形例を示す。本変形例における建物１１０は、内部に燃料電池収納室７４が設けられる塀７０である。本変形例における塀７０の各構成要素のうち、図１の建物１１０において同一の符号が付された構成要素は、図１の建物１１０において同一の符号が付された構成要素とそれぞれ同一の機能を有するので説明を省略する。また、建物１１０は他にも、建造物の壁であってよい。また、壁部材６４は、当該建造物の壁、塀７０などの、建造物の構造物に用いられる部材であってよい。 FIG. 9 shows a modification of the building 110. The building 110 in this modification is a ridge 70 in which a fuel cell storage chamber 74 is provided. Among the components of the fence 70 in this modification, the components denoted by the same reference numerals in the building 110 of FIG. 1 have the same functions as the components denoted by the same reference numerals in the building 110 of FIG. The description is omitted. In addition, the building 110 may be a wall of a building. Moreover, the wall member 64 may be a member used for a structure of a building such as a wall of the building or a fence 70.

以上、実施形態を用いて本発明を説明したが、本発明の技術的範囲は上記実施形態に記載の範囲には限定されない。上記実施形態に、多様な変更または改良を加えることができる。そのような変更または改良を加えた形態も本発明の技術的範囲に含まれ得ることが、特許請求の範囲の記載から明らかである。 As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. Various modifications or improvements can be added to the above embodiment. It is apparent from the scope of the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

建物１１０の一例を示す図である。It is a figure which shows an example of the building 110. FIG. 壁部材６４の一例を示す図である。It is a figure which shows an example of the wall member. 壁部材６４の変形例を示す図である。It is a figure which shows the modification of the wall member. 壁部材６４の更なる変形例を示す図である。It is a figure which shows the further modification of the wall member. 貯湯システム１００の構成の一例を示す図である。It is a figure which shows an example of a structure of the hot water storage system. 貯湯システム１００の変形例を示す図である。It is a figure which shows the modification of the hot water storage system. 貯湯システム１００の更なる変形例を示す図である。It is a figure which shows the further modification of the hot water storage system. 燃料電池収納室７４の配置の他の一例を示す図である。FIG. 6 is a view showing another example of the arrangement of the fuel cell storage chamber 74. 建物１１０の変形例を示す図である。It is a figure which shows the modification of the building.

Explanation of symbols

４０燃料電池
４２連通口
４３接続配管
４４ａ第１の貯湯部
４４ｂ第２の貯湯部
４６部分空間
４８貯湯空間
５０制御部
５１ウェザーカバー
５２排気部
５３給気部
５４排気口
５５逆流防止板
５６加温配管
５７加温配管
５８温水加温部
６０断熱材
６０ａ第１の断熱材
６０ｂ第２の断熱材
６２ａ第１の側面
６２ｂ第２の側面
６４壁部材
６６連結部材
６８テラス
７０塀
７２腰壁
７３床面
７４燃料電池収納室
８２給湯配管
８６排熱配管
８８排熱配管
９８排熱ポンプ
９９排熱ポンプ
１００貯湯システム
１１０建物 40 Fuel Cell 42 Communication Port 43 Connection Pipe 44a First Hot Water Storage Unit 44b Second Hot Water Storage Unit 46 Partial Space 48 Hot Water Storage Space 50 Control Unit 51 Weather Cover 52 Exhaust Unit 53 Air Supply Unit 54 Exhaust Port 55 Backflow Prevention Plate 56 Heating Pipe 57 Heating pipe 58 Hot water heating section 60 Heat insulating material 60a First heat insulating material 60b Second heat insulating material 62a First side surface 62b Second side surface 64 Wall member 66 Connecting member 68 Terrace 70 塀 72 Waist wall 73 Floor Surface 74 Fuel cell storage chamber 82 Hot water supply pipe 86 Waste heat pipe 88 Waste heat pipe 98 Waste heat pump 99 Waste heat pump 100 Hot water storage system 110 Building

Claims

A first hot water storage section for storing hot water heated by heat exchange with a heat medium that cools the fuel cell;
Storing hot water heated by heat exchange with the heat medium, and comprising a second hot water storage section having lower heat insulation than the first hot water storage section,
The first hot water storage section stores hot water heated by exchanging heat with the heat medium preferentially over the second hot water storage section,
The first hot water storage section has a heat insulating material on the outside,
The second hot water storage section is a hot water storage system that does not have a heat insulating material in at least a part of the outside.

The hot water storage system according to claim 1, wherein the second hot water storage section has no heat insulating material outside.

The hot water storage system according to claim 1 or 2, wherein the first hot water storage section stores hot water having a temperature higher than that of hot water stored in the second hot water storage section.

The first hot water storage section is provided above the second hot water storage section,
The hot water storage system is:
The hot water storage system according to any one of claims 1 to 3, further comprising a connection pipe that connects a lower part of the first hot water storage part and an upper part of the second hot water storage part.

The hot water storage system according to claim 4, wherein the first hot water storage section is provided on a floor above the floor on which the second hot water storage section is provided.

The hot water storage system according to any one of claims 1 to 5, wherein the first hot water storage section and the second hot water storage section are provided inside a wall of a building.

The hot water storage system according to any one of claims 1 to 6, further comprising a hot water supply pipe for supplying hot water stored in the first hot water storage section to hot water supply demand.

The ratio of the surface area to the volume of hot water stored in the second hot water storage section is larger than the ratio of the surface area to the volume of hot water stored in the first hot water storage section. The hot water storage system described in Crab.

Hot water is stored in the first hot water storage section and / or the second hot water storage section by heat exchange between the heat medium and hot water stored in the first hot water storage section and / or the second hot water storage section. Further equipped with a warm water heating part for warming warm water,
The warm water warming unit warms warm water stored in the first hot water storage unit before the second hot water storage unit, and warms the warm water stored in the first hot water storage unit, The hot water storage system according to any one of claims 1 to 8, wherein the hot water stored in the second hot water storage section is heated.

A first heating pipe for warming the hot water stored in the lower part of the first hot water storage unit to the warm water heating unit and supplying the heated hot water to the upper part of the first hot water storage unit; ,
A second heating pipe for heating the hot water stored in the lower part of the second hot water storage unit to the hot water heating unit and supplying the hot water to the upper part of the second hot water storage unit; Further comprising
The hot water storage system according to claim 9, wherein the warm water warming unit provides the heat amount of the heat medium to the first warming pipe before the second warming pipe.

The hot water storage according to claim 9, further comprising a control unit that heats the hot water stored in the second hot water storage unit by the hot water heating unit on condition that the hot water cannot be further stored in the first hot water storage unit. system.

The hot water stored in the second hot water storage unit is heated by guiding the hot water to the hot water heating unit, and the heated hot water is further supplied to the first hot water storage unit. Hot water storage system.

The hot water warming section is provided in each of the first hot water storage section and the second hot water storage section to warm hot water stored in each of the first hot water storage section and the second hot water storage section. And
The hot water storage system is:
The heating medium is provided in the second hot water storage section after the warm water stored in the first hot water storage section is heated by guiding the heat medium to the hot water heating section provided in the first hot water storage section. The hot water storage system according to claim 9, further comprising a hot water storage pipe that guides the hot water heating unit to heat the hot water stored in the second hot water storage unit.

The hot water storage system according to any one of claims 1 to 13, wherein the first hot water storage section and the second hot water storage section are independent hot water storage tanks.

A building comprising the hot water storage system according to any one of claims 1 to 14 .