JP2021046980A

JP2021046980A - Heat exchanging device and fuel cell system

Info

Publication number: JP2021046980A
Application number: JP2019170527A
Authority: JP
Inventors: 山下　満雄; Mitsuo Yamashita; 満雄山下
Original assignee: Kyocera Corp; Dainichi Co Ltd
Current assignee: Kyocera Corp; Dainichi Co Ltd
Priority date: 2019-09-19
Filing date: 2019-09-19
Publication date: 2021-03-25

Abstract

To provide a heat exchanging device that has a simple configuration not using any pump but can exchange heat between media, and to provide a fuel cell system.SOLUTION: A heat exchanging device 100 includes: a heat medium tank 10 for storing a circulation heat medium body CM; a heating heat exchanger 30 connected to a lower opening 12 of the heat medium tank 10 and heating the circulation heat medium body CM by exchanging heat with a heating medium HM flowing into it; and a water-heating heat exchanger 50 disposed above the heating heat exchanger 30 while being connected to an upper opening 14 of the heat medium tank 10 and heating heated water WM by exchanging heat with the circulation heat medium body CM.SELECTED DRAWING: Figure 3

Description

本開示は、熱交換装置、及び燃料電池システムに関する。 The present disclosure relates to heat exchangers and fuel cell systems.

従来、熱交換器を備えた給湯装置として、例えば特許文献１に示すように、蓄熱用流体を貯留するタンクの内部に給湯用熱交換器を配置し、電動ポンプによって汲み上げられた蓄熱用流体が流れる一次側通路と、給湯用配管に接続された二次側通路とを備えたものが開示されている。 Conventionally, as a hot water supply device equipped with a heat exchanger, for example, as shown in Patent Document 1, a hot water supply heat exchanger is arranged inside a tank for storing a heat storage fluid, and the heat storage fluid pumped up by an electric pump is used. Those provided with a flowing primary side passage and a secondary side passage connected to a hot water supply pipe are disclosed.

特開２００１−１５３４５８号公報Japanese Unexamined Patent Publication No. 2001-153458

ところで、上述のような給湯装置では、給湯水を温めるために蓄熱用流体をポンプで汲み上げる必要があり、熱交換装置の簡素化という点で未だ改善の余地があった。 By the way, in the above-mentioned hot water supply device, it is necessary to pump the heat storage fluid in order to heat the hot water supply, and there is still room for improvement in terms of simplification of the heat exchange device.

本開示は、このような問題点を解決することを課題とするものであり、その目的は、ポンプを用いない簡素な構成でも媒体間で熱交換が可能な熱交換装置、及び燃料電池システムを提案することである。 An object of the present disclosure is to solve such a problem, and an object of the present invention is to provide a heat exchange device and a fuel cell system capable of heat exchange between media even in a simple configuration without using a pump. To make a suggestion.

本開示の熱交換装置は、循環熱媒体を収容する熱媒タンクと、前記熱媒タンクの下部開口に連結され、流入する加熱媒体と熱交換して前記循環熱媒体を加熱する加熱用熱交換器と、前記熱媒タンクの上部開口に連結されると共に前記加熱用熱交換器の上方に配置され、前記循環熱媒体と熱交換して給湯水を加熱する給湯用熱交換器とを備えることを特徴とする。 The heat exchange apparatus of the present disclosure is a heat exchange for heating that is connected to a heat medium tank accommodating a circulating heat medium and a lower opening of the heat medium tank and exchanges heat with an inflowing heating medium to heat the circulating heat medium. A hot water supply heat exchanger connected to the upper opening of the heat medium tank and arranged above the heating heat exchanger to exchange heat with the circulating heat medium to heat hot water supply water. It is characterized by.

本開示の燃料電池システムは、燃料電池装置と、前記熱交換装置とを備える燃料電池システムであって、前記燃料電池装置における燃料の燃焼によって生成された排ガスを加熱媒体として前記熱交換装置を作動させることを特徴とする。 The fuel cell system of the present disclosure is a fuel cell system including a fuel cell device and the heat exchange device, and operates the heat exchange device using exhaust gas generated by combustion of fuel in the fuel cell device as a heating medium. It is characterized by letting it.

本開示によれば、ポンプを用いない簡素な構成でも媒体間で熱交換が可能な熱交換装置、及び燃料電池システムを提案することができる。 According to the present disclosure, it is possible to propose a heat exchange device and a fuel cell system capable of heat exchange between media even with a simple configuration without using a pump.

本開示の一実施形態に係る熱交換装置の正面図である。It is a front view of the heat exchange apparatus which concerns on one Embodiment of this disclosure. 図１における熱媒タンク、加熱用熱交換器、及び給湯用熱交換器の構成を示す斜視図である。It is a perspective view which shows the structure of the heat medium tank, the heat exchanger for heating, and the heat exchanger for hot water supply in FIG. 図１における加熱用熱交換器、及び給湯用熱交換器の構成を示す断面図である。It is sectional drawing which shows the structure of the heat exchanger for heating and the heat exchanger for hot water supply in FIG. 図３におけるＡ−Ａ断面図である。FIG. 3 is a cross-sectional view taken along the line AA in FIG. 本開示の一実施形態に係る熱交換装置を図１の左後方から見た図である。It is a figure which looked at the heat exchange apparatus which concerns on one Embodiment of this disclosure from the left rear of FIG. 図５において断熱材を取り外した状態を示す図である。FIG. 5 is a diagram showing a state in which the heat insulating material is removed in FIG. 本開示の一実施形態に係る燃料電池システムの構成を示すブロック図である。It is a block diagram which shows the structure of the fuel cell system which concerns on one Embodiment of this disclosure. 図３において低温の給湯水を給湯水流路に供給した状態を示す図である。FIG. 3 is a diagram showing a state in which low-temperature hot water is supplied to the hot water flow path. 本開示の一実施形態に係る熱交換装置の変形例を示す正面図である。It is a front view which shows the modification of the heat exchange apparatus which concerns on one Embodiment of this disclosure.

以下、図面を参照して、本開示をより具体的に説明する。 Hereinafter, the present disclosure will be described in more detail with reference to the drawings.

（熱交換装置の構成）
図１は、本開示の一実施形態である熱交換装置１００と、後述する燃料電池装置２００の基幹部材であり熱交換装置１００に加熱媒体である排ガスＨＭを供給する燃料電池モジュール１３６とを示す。熱交換装置１００は、給湯水ＷＭ等を温める循環熱媒体ＣＭを収容する熱媒タンク１０と、熱媒タンク１０の下部開口１２に熱媒流路２０を介して連結され、燃料電池モジュール１３６から供給される加熱媒体（排ガスＨＭ）と熱交換して循環熱媒体ＣＭを加熱する加熱用熱交換器３０と、熱媒タンク１０の上部開口１４に熱媒流路２０を介して連結されると共に加熱用熱交換器３０の上方に配置され、循環熱媒体ＣＭと熱交換して給湯水ＷＭを加熱する給湯用熱交換器５０とを備えている。本実施形態では、加熱媒体である排ガスＨＭは、燃料電池モジュール１３６において原燃料から生成された水素の燃焼により生成される高温ガスであり、燃料電池モジュール１３６に接続された排気ダクト６０を経由して加熱用熱交換器３０に供給されている。また、給湯水ＷＭは、水道管から給水管７０経由で給湯用熱交換器５０に供給され、給湯用熱交換器５０で加熱された給湯水ＷＭは給湯管７２経由で浴室やキッチン等に供給される。 (Structure of heat exchanger)
FIG. 1 shows a heat exchange device 100 according to an embodiment of the present disclosure, and a fuel cell module 136 that supplies an exhaust gas HM that is a core member of the fuel cell device 200 and is a heating medium to the heat exchange device 100, which will be described later. .. The heat exchange device 100 is connected to the heat medium tank 10 accommodating the circulating heat medium CM for heating the hot water supply water WM and the like via the heat medium flow path 20 to the lower opening 12 of the heat medium tank 10 from the fuel cell module 136. A heat exchanger 30 for heating that heats the circulating heat medium CM by exchanging heat with the supplied heating medium (exhaust exhaust gas HM) is connected to the upper opening 14 of the heat medium tank 10 via a heat medium flow path 20. It is arranged above the heat exchanger 30 for heating, and includes a heat exchanger 50 for hot water supply that heats the hot water supply water WM by exchanging heat with the circulating heat medium CM. In the present embodiment, the exhaust gas HM, which is a heating medium, is a high-temperature gas generated by combustion of hydrogen generated from the raw fuel in the fuel cell module 136, and passes through an exhaust duct 60 connected to the fuel cell module 136. It is supplied to the heat exchanger 30 for heating. Further, the hot water supply water WM is supplied from the water pipe to the hot water supply heat exchanger 50 via the water supply pipe 70, and the hot water supply water WM heated by the hot water supply heat exchanger 50 is supplied to the bathroom, kitchen, etc. via the hot water supply pipe 72. Will be done.

なお、本明細書、特許請求の範囲、要約書および図面では、熱媒タンク１０の上部開口１４が位置する側を上方（図１における上側）とし、熱媒タンク１０の下部開口１２が位置する側を下方（図１における下側）とする。また、図１において紙面に垂直な手前方向を前方、紙面に垂直な奥行き方向を後方とする。 In the present specification, claims, abstract and drawings, the side where the upper opening 14 of the heat medium tank 10 is located is upward (upper side in FIG. 1), and the lower opening 12 of the heat medium tank 10 is located. The side is the lower side (lower side in FIG. 1). Further, in FIG. 1, the front direction perpendicular to the paper surface is defined as the front, and the depth direction perpendicular to the paper surface is defined as the rear.

加熱用熱交換器３０は、排ガスＨＭ（加熱媒体）と循環熱媒体ＣＭとで熱交換を行わせる熱交換器である。本実施形態において、加熱用熱交換器３０は、図１及び図３に示すように、燃料電池モジュール１３６からの排ガスＨＭを加熱媒体として排気ダクト６０経由で取り込み、加熱用熱交換器３０内を流れる循環熱媒体ＣＭと熱交換させる。 The heating heat exchanger 30 is a heat exchanger that exchanges heat between the exhaust gas HM (heating medium) and the circulating heat medium CM. In the present embodiment, as shown in FIGS. 1 and 3, the heating heat exchanger 30 takes in the exhaust gas HM from the fuel cell module 136 as a heating medium via the exhaust duct 60, and inside the heating heat exchanger 30. Heat is exchanged with the flowing circulating heat medium CM.

図３及び図４に、加熱用熱交換器３０の詳細な構成を示す。加熱用熱交換器３０は、図３の右上から左下に向かって延びる略円筒形状を備えており、燃料電池モジュール１３６からの排ガスＨＭが加熱用熱交換器３０の長手方向に沿って流れている。加熱用熱交換器３０は、内部に同心状に３つの媒体流路を備えている。３つの媒体流路は、最外周に設けられ循環熱媒体ＣＭが通る第１循環媒体流路ＣＣ１と、最内周に設けられ循環熱媒体ＣＭが通る第２循環媒体流路ＣＣ２と、第１循環媒体流路ＣＣ１と第２循環媒体流路ＣＣ２の間の径方向位置に設けられ燃料電池モジュール１３６からの排ガスＨＭが通る加熱媒体流路ＨＣとを備えている。すなわち、加熱媒体流路ＨＣの径方向両側に第１循環媒体流路ＣＣ１及び第２循環媒体流路ＣＣ２が隣接して配置されている。 3 and 4 show a detailed configuration of the heating heat exchanger 30. The heating heat exchanger 30 has a substantially cylindrical shape extending from the upper right to the lower left in FIG. 3, and the exhaust gas HM from the fuel cell module 136 flows along the longitudinal direction of the heating heat exchanger 30. .. The heat exchanger 30 for heating is provided with three media channels concentrically inside. The three medium flow paths are the first circulation medium flow path CC1 provided on the outermost circumference and through which the circulation heat medium CM passes, the second circulation medium flow path CC2 provided on the innermost circumference and through which the circulation heat medium CM passes, and the first. It is provided at a radial position between the circulation medium flow path CC1 and the second circulation medium flow path CC2, and includes a heating medium flow path HC through which the exhaust gas HM from the fuel cell module 136 passes. That is, the first circulation medium flow path CC1 and the second circulation medium flow path CC2 are arranged adjacent to each other on both sides of the heating medium flow path HC in the radial direction.

本実施形態に係る熱交換装置１００は、燃料電池モジュール１３６からの排ガスＨＭを加熱媒体として循環熱媒体ＣＭとの熱交換を行わせる。排ガスＨＭは、燃料電池モジュール１３６において原燃料（例えば都市ガス等）に対して後述する改質器１３５を通して得られた水素に、酸素含有ガスを供給し燃焼させることによって排出される高温の二酸化炭素や水（水蒸気）等が主成分である。本実施形態では、循環熱媒体ＣＭとして水道水を用いているが、比熱が大きく導管を腐食させない他の様々な媒体を用いてもよい。 The heat exchange device 100 according to the present embodiment uses the exhaust gas HM from the fuel cell module 136 as a heating medium to exchange heat with the circulating heat medium CM. The exhaust gas HM is a high-temperature carbon dioxide emitted by supplying an oxygen-containing gas to hydrogen obtained through a reformer 135 described later for a raw fuel (for example, city gas) in the fuel cell module 136 and burning the gas. And water (steam) are the main components. In the present embodiment, tap water is used as the circulating heat medium CM, but various other media having a large specific heat and not corroding the conduit may be used.

加熱用熱交換器３０の上方（図３の右上）から排気ダクト６０経由で供給された排ガスＨＭは、加熱用熱交換器３０内の加熱媒体流路ＨＣを経由して流れ、循環熱媒体ＣＭと熱交換した後に加熱用熱交換器３０の下方（図３の左下）に設けられた排ガス流出口３８から外部に排出される。加熱媒体流路ＨＣは、図３及び図４に示すように、排ガスＨＭの流動方向に直交する径方向において第１循環媒体流路ＣＣ１と第２循環媒体流路ＣＣ２の間に挟まれているので、排ガスＨＭから外部に逃げる熱量を低減して、排ガスＨＭの熱を効率よく循環熱媒体ＣＭに伝えることができる。 The exhaust gas HM supplied from above the heating heat exchanger 30 (upper right in FIG. 3) via the exhaust duct 60 flows through the heating medium flow path HC in the heating heat exchanger 30 and flows through the circulating heat medium CM. After exchanging heat with the heat exchanger 30, the heat is discharged to the outside from the exhaust gas outlet 38 provided below the heat exchanger 30 for heating (lower left in FIG. 3). As shown in FIGS. 3 and 4, the heating medium flow path HC is sandwiched between the first circulation medium flow path CC1 and the second circulation medium flow path CC2 in the radial direction orthogonal to the flow direction of the exhaust gas HM. Therefore, the amount of heat escaping from the exhaust gas HM to the outside can be reduced, and the heat of the exhaust gas HM can be efficiently transferred to the circulating heat medium CM.

なお、本実施形態では、第１循環媒体流路ＣＣ１、加熱媒体流路ＨＣ及び第２循環媒体流路ＣＣ２が略同心状に配置されるように構成したが、この態様には限定されない。第１循環媒体流路ＣＣ１、加熱媒体流路ＨＣ及び第２循環媒体流路ＣＣ２は、互いに偏心して配置されていてもよい。また、第１循環媒体流路ＣＣ１、加熱媒体流路ＨＣ及び第２循環媒体流路ＣＣ２がこの順序で排ガスＨＭの流動方向に直交する一方向に並んでいてもよい。 In the present embodiment, the first circulation medium flow path CC1, the heating medium flow path HC, and the second circulation medium flow path CC2 are arranged so as to be substantially concentrically arranged, but the present embodiment is not limited to this embodiment. The first circulation medium flow path CC1, the heating medium flow path HC, and the second circulation medium flow path CC2 may be arranged eccentrically with each other. Further, the first circulation medium flow path CC1, the heating medium flow path HC, and the second circulation medium flow path CC2 may be arranged in this order in one direction orthogonal to the flow direction of the exhaust gas HM.

加熱用熱交換器３０の第１循環媒体流路ＣＣ１及び第２循環媒体流路ＣＣ２には、熱媒タンク１０の下部開口１２から熱媒流路２０を介して循環熱媒体ＣＭが供給されている。第１循環媒体流路ＣＣ１及び第２循環媒体流路ＣＣ２に供給された循環熱媒体ＣＭは、排ガスＨＭから供給された熱により温度上昇する。そして、後述する給湯水流路ＷＣ１，ＷＣ２に低温の給湯水ＷＭが供給されていないとき、加熱された循環熱媒体ＣＭは対流により加熱用熱交換器３０と第２給湯用熱交換器５０Ｂとの境界部に設けられた連通口３２を経由して上昇し、給湯用熱交換器５０へと向かう。なお、加熱用熱交換器３０と給湯用熱交換器５０とは、熱媒流路２０を介して連結されてもよい。 Circulating heat medium CM is supplied to the first circulation medium flow path CC1 and the second circulation medium flow path CC2 of the heat exchanger 30 for heating from the lower opening 12 of the heat medium tank 10 via the heat medium flow path 20. There is. The temperature of the circulating heat medium CM supplied to the first circulation medium flow path CC1 and the second circulation medium flow path CC2 rises due to the heat supplied from the exhaust gas HM. When the low-temperature hot water supply water WM is not supplied to the hot water supply water flow paths WC1 and WC2, which will be described later, the heated circulating heat medium CM is convected between the heating heat exchanger 30 and the second hot water supply heat exchanger 50B. It rises through the communication port 32 provided at the boundary portion and heads for the hot water supply heat exchanger 50. The heating heat exchanger 30 and the hot water supply heat exchanger 50 may be connected via the heat medium flow path 20.

加熱用熱交換器３０の上方には、熱媒タンク１０の上部開口１４に熱媒流路２０を介して連結された給湯用熱交換器５０が設けられている。給湯用熱交換器５０は、図３に示すように、上部開口１４に連通し図３の左上から右下に向けて延びる第１給湯用熱交換器５０Ａと、第１給湯用熱交換器５０Ａの下端部に連結され、図３の右上から左下に向けて加熱用熱交換器３０に沿って延びる第２給湯用熱交換器５０Ｂとを備えている。 Above the heat exchanger 30 for heating, a heat exchanger 50 for hot water supply is provided which is connected to the upper opening 14 of the heat medium tank 10 via the heat medium flow path 20. As shown in FIG. 3, the hot water supply heat exchanger 50 communicates with the upper opening 14 and extends from the upper left to the lower right in FIG. 3, the first hot water supply heat exchanger 50A and the first hot water supply heat exchanger 50A. It is provided with a second hot water supply heat exchanger 50B which is connected to the lower end portion of the above and extends from the upper right to the lower left of FIG. 3 along the heat exchanger 30 for heating.

第１給湯用熱交換器５０Ａ及び第２給湯用熱交換器５０Ｂは、内部に同心状に２つの媒体流路を備えている。２つの媒体流路は、外周側に設けられ循環熱媒体ＣＭが通る外側循環流路ＣＯ１，ＣＯ２、並びに内周側に設けられ給湯水ＷＭが通る給湯水流路ＷＣ１，ＷＣ２とを備えている。すなわち、第１給湯用熱交換器５０Ａ及び第２給湯用熱交換器５０Ｂの内部において、給湯水ＷＭが通る給湯水流路ＷＣ１，ＷＣ２と循環熱媒体ＣＭが通る外側循環流路ＣＯ１，ＣＯ２とが径方向に隣接して配置されている。また、給湯水流路ＷＣ１，ＷＣ２を形成する導管の外周面から径方向外側に熱回収用フィンＨＦ１，ＨＦ２が突出している。熱回収用フィンＨＦ１，ＨＦ２の材質には、例えばステンレス鋼、銅、若しくはアルミニウム等の金属、又はそれらを含む合金等を用いることができる。また、熱回収用フィンＨＦ１，ＨＦ２は、給湯水流路ＷＣ１，ＷＣ２を形成する導管と一体形成することができる。他方、外側循環流路ＣＯ１，ＣＯ２の外側を画定する導管は、例えばポリエチレン（ＰＥ）、ポリプロピレン（ＰＰ）等の合成樹脂材料のブロー成形等によって形作ることができる。しかし、この態様に限定されず、他の合成樹脂材料や金属材料を用いて形成することもできる。給湯水流路ＷＣ１，ＷＣ２は、図３に示すように連結流路ＷＣＣにより連結されている。 The first hot water supply heat exchanger 50A and the second hot water supply heat exchanger 50B are provided with two medium flow paths concentrically inside. The two medium flow paths include outer circulation flow paths CO1 and CO2 provided on the outer peripheral side through which the circulating heat medium CM passes, and hot water supply water flow paths WC1 and WC2 provided on the inner peripheral side through which the hot water supply water WM passes. That is, inside the first hot water supply heat exchanger 50A and the second hot water supply heat exchanger 50B, the hot water supply water passages WC1 and WC2 through which the hot water supply water WM passes and the outer circulation passages CO1 and CO2 through which the circulation heat medium CM passes are They are arranged adjacent to each other in the radial direction. Further, the heat recovery fins HF1 and HF2 project radially outward from the outer peripheral surface of the conduit forming the hot water supply water flow paths WC1 and WC2. As the material of the heat recovery fins HF1 and HF2, for example, a metal such as stainless steel, copper, or aluminum, or an alloy containing them can be used. Further, the heat recovery fins HF1 and HF2 can be integrally formed with the conduit forming the hot water supply water flow paths WC1 and WC2. On the other hand, the conduit defining the outside of the outer circulation channels CO1 and CO2 can be formed by, for example, blow molding of a synthetic resin material such as polyethylene (PE) or polypropylene (PP). However, the present invention is not limited to this embodiment, and it can be formed by using other synthetic resin materials or metal materials. The hot water supply water flow paths WC1 and WC2 are connected by a connecting flow path WCC as shown in FIG.

第２給湯用熱交換器５０Ｂの外側循環流路ＣＯ２と、加熱用熱交換器３０の第１循環媒体流路ＣＣ１とは、図３に示すように、連通口３２を介して互いに連通している。また、第１給湯用熱交換器５０Ａの外側循環流路ＣＯ１及び第２給湯用熱交換器５０Ｂの外側循環流路ＣＯ２は、図３に示す連結部５２を介して連通している。これによって、給湯水流路ＷＣ１，ＷＣ２に低温の給湯水ＷＭが供給されていないとき、熱媒タンク１０の下部開口１２から供給され排ガスＨＭにより加熱された循環熱媒体ＣＭは、対流により上昇して、加熱用熱交換器３０の第１循環媒体流路ＣＣ１及び第２循環媒体流路ＣＣ２から、第２給湯用熱交換器５０Ｂの外側循環流路ＣＯ２及び第１給湯用熱交換器５０Ａの外側循環流路ＣＯ１を経由して、上部開口１４から熱媒タンク１０内へと戻る。このような構成によって、熱媒流路２０にポンプを設けなくても、循環熱媒体ＣＭの上下方向の温度差に起因する対流によって、循環熱媒体ＣＭを加熱して上昇させ、熱媒タンク１０に還流させることができる。 As shown in FIG. 3, the outer circulation flow path CO2 of the second hot water supply heat exchanger 50B and the first circulation medium flow path CC1 of the heating heat exchanger 30 communicate with each other through the communication port 32. There is. Further, the outer circulation flow path CO1 of the first hot water supply heat exchanger 50A and the outer circulation flow path CO2 of the second hot water supply heat exchanger 50B communicate with each other via the connecting portion 52 shown in FIG. As a result, when the low-temperature hot water supply water WM is not supplied to the hot water supply water flow paths WC1 and WC2, the circulating heat medium CM supplied from the lower opening 12 of the heat medium tank 10 and heated by the exhaust gas HM rises due to convection. From the first circulation medium flow path CC1 and the second circulation medium flow path CC2 of the heating heat exchanger 30, the outside circulation flow path CO2 of the second hot water supply heat exchanger 50B and the outside of the first hot water supply heat exchanger 50A. It returns to the inside of the heat medium tank 10 from the upper opening 14 via the circulation flow path CO1. With such a configuration, even if a pump is not provided in the heat medium flow path 20, the circulating heat medium CM is heated and raised by convection caused by the temperature difference in the vertical direction of the circulating heat medium CM, and the heat medium tank 10 is used. Can be refluxed to.

次に熱媒タンク１０の構成について説明する。熱媒タンク１０は、内部に循環熱媒体ＣＭの収容空間を備えた容器体であり、図２に示すように、加熱用熱交換器３０と接続される下部開口１２と、給湯用熱交換器５０（第１給湯用熱交換器５０Ａ）と接続される上部開口１４と、熱媒タンク１０の側面に形成される複数の凸部１３とを備えている。また、熱媒タンク１０は、断熱材１１により覆われると共に、熱媒タンク１０の下部側面には、図１、図５及び図６に示すように、熱媒タンク１０を冷却するための冷却用ファン１６が配置されている。 Next, the configuration of the heat medium tank 10 will be described. The heat medium tank 10 is a container body provided with a storage space for the circulating heat medium CM inside, and as shown in FIG. 2, a lower opening 12 connected to the heating heat exchanger 30 and a hot water supply heat exchanger. It is provided with an upper opening 14 connected to 50 (first hot water supply heat exchanger 50A) and a plurality of convex portions 13 formed on the side surface of the heat medium tank 10. Further, the heat medium tank 10 is covered with a heat insulating material 11, and the lower side surface of the heat medium tank 10 is for cooling for cooling the heat medium tank 10, as shown in FIGS. 1, 5 and 6. The fan 16 is arranged.

図５及び図６は、図１に示す熱交換装置１００を左斜め後方から見た図である。図５は断熱材１１を装着した使用時の状態を示し、図６は、図５の状態から断熱材１１のみを取り外した状態を示している。断熱材１１の下部後方には、冷却用ファン１６から取り込んだ空気を排出するための開口１５が設けられている。 5 and 6 are views of the heat exchange device 100 shown in FIG. 1 viewed from diagonally rear left. FIG. 5 shows a state in which the heat insulating material 11 is attached and used, and FIG. 6 shows a state in which only the heat insulating material 11 is removed from the state of FIG. An opening 15 for discharging the air taken in from the cooling fan 16 is provided behind the lower portion of the heat insulating material 11.

図６に示すように、冷却用ファン１６の上方における熱媒タンク１０の側面には、複数の凸部１３Ａが二次元的に配置されている。凸部１３Ａは、熱媒タンク１０に断熱材１１を装着したときに、凸部１３Ａの頂部が断熱材１１の裏面に当接するように構成されている。これによって、複数の凸部１３Ａの間の領域は、冷却用ファン１６によって外部から取り込まれた空気を上方に導く第１空気流路ＣＵを構成している。つまり第１空気流路ＣＵは、冷却用ファン１６と熱媒タンク１０の上部側面とを連通させている。 As shown in FIG. 6, a plurality of convex portions 13A are two-dimensionally arranged on the side surface of the heat medium tank 10 above the cooling fan 16. The convex portion 13A is configured such that when the heat insulating material 11 is attached to the heat medium tank 10, the top of the convex portion 13A comes into contact with the back surface of the heat insulating material 11. As a result, the region between the plurality of convex portions 13A constitutes a first air flow path CU that guides the air taken in from the outside by the cooling fan 16 upward. That is, the first air flow path CU communicates the cooling fan 16 with the upper side surface of the heat medium tank 10.

熱媒タンク１０の後部側面には、更なる凸部１３Ｂが略鉛直方向に複数並べられている。凸部１３Ｂについても、熱媒タンク１０に断熱材１１を装着したときに、凸部１３Ｂの頂部が断熱材１１の裏面に当接するように構成されている。これによって、凸部１３Ｂに隣接する断熱材１１と熱媒タンク１０の側面との間の領域は第２空気流路ＣＤを構成する。第２空気流路ＣＤは、冷却用ファン１６によって第１空気流路ＣＵ経由で熱媒タンク１０の上部の水平流路ＣＨに導かれた空気を、更に開口１５まで下方に導く。従って、熱媒タンク１０内の循環熱媒体ＣＭが所定温度以上になった場合に冷却用ファン１６を作動させ、空気が熱媒タンク１０の側面を強制対流することにより熱媒タンク１０内の循環熱媒体ＣＭを効率的に冷却することができる。上記所定温度は、例えば７５℃とすることができる。 On the rear side surface of the heat medium tank 10, a plurality of further convex portions 13B are arranged in a substantially vertical direction. The convex portion 13B is also configured such that when the heat insulating material 11 is attached to the heat medium tank 10, the top of the convex portion 13B abuts on the back surface of the heat insulating material 11. As a result, the region between the heat insulating material 11 adjacent to the convex portion 13B and the side surface of the heat medium tank 10 constitutes the second air flow path CD. The second air flow path CD guides the air guided by the cooling fan 16 to the horizontal flow path CH at the upper part of the heat medium tank 10 via the first air flow path CU further downward to the opening 15. Therefore, when the circulating heat medium CM in the heat medium tank 10 reaches a predetermined temperature or higher, the cooling fan 16 is operated and air is forcibly convected on the side surface of the heat medium tank 10 to circulate in the heat medium tank 10. The heat medium CM can be cooled efficiently. The predetermined temperature can be, for example, 75 ° C.

他方、例えば燃料電池装置２００の始動時など循環熱媒体ＣＭの熱を用いて燃料電池装置２００の始動を促進したい場合には、冷却用ファン１６の作動を停止させる。これによって、熱媒タンク１０の側面における空気の強制対流を停止させることができる。本実施形態では、図６に示す第１空気流路ＣＵ、水平流路ＣＨ及び第２空気流路ＣＤからなる空気流路は、熱媒タンク１０の下部のみにおいて外部に開放され、熱媒タンク１０の上部では外部に対して開放されていない。そのため、冷却用ファン１６を作動させていない状態において、熱媒タンク１０の側面によって温められた空気は上方に移動し、水平流路ＣＨ及びその近傍に滞留する。従って、熱媒タンク１０の側面において自然対流が起こりにくくすることができるので、熱媒タンク１０内の循環熱媒体ＣＭの温度を下がりにくくすることができる。 On the other hand, when it is desired to promote the start of the fuel cell device 200 by using the heat of the circulating heat medium CM, for example, when the fuel cell device 200 is started, the operation of the cooling fan 16 is stopped. Thereby, the forced convection of air on the side surface of the heat medium tank 10 can be stopped. In the present embodiment, the air flow path including the first air flow path CU, the horizontal flow path CH, and the second air flow path CD shown in FIG. 6 is opened to the outside only at the lower part of the heat medium tank 10, and the heat medium tank The upper part of 10 is not open to the outside. Therefore, in a state where the cooling fan 16 is not operated, the air warmed by the side surface of the heat medium tank 10 moves upward and stays in the horizontal flow path CH and its vicinity. Therefore, since natural convection can be less likely to occur on the side surface of the heat medium tank 10, it is possible to make it difficult for the temperature of the circulating heat medium CM in the heat medium tank 10 to drop.

本実施形態において、熱媒タンク１０は、例えばポリエチレン（ＰＥ）、ポリプロピレン（ＰＰ）等の合成樹脂材料のブロー成形等によって形作ることができる。しかし、この態様に限定されず、熱媒タンク１０は、他の合成樹脂材料や金属材料を用いて形成することもできる。 In the present embodiment, the heat medium tank 10 can be formed by, for example, blow molding of a synthetic resin material such as polyethylene (PE) or polypropylene (PP). However, the present invention is not limited to this embodiment, and the heat medium tank 10 can be formed by using another synthetic resin material or a metal material.

次に、本開示の一実施形態に係る燃料電池システム３００について図７等を用いて説明する。 Next, the fuel cell system 300 according to the embodiment of the present disclosure will be described with reference to FIG. 7 and the like.

本実施形態に係る燃料電池システム３００は、上述の熱交換装置１００と、熱交換装置１００に加熱媒体としての排ガスＨＭを供給する燃料電池装置２００とを備えている。 The fuel cell system 300 according to the present embodiment includes the above-mentioned heat exchange device 100 and a fuel cell device 200 that supplies exhaust gas HM as a heating medium to the heat exchange device 100.

図７に示す燃料電池装置２００は、都市ガス等の原燃料を供給する原燃料供給装置１３２と、燃料電池セルに酸素含有ガスを供給するための酸素含有ガス供給装置１３３と、セルスタック１３４及び改質器１３５を有する燃料電池モジュール１３６とを備えている。なお、図７に示す燃料電池装置２００では、燃料電池モジュール１３６を二点鎖線によって囲んで示している。セルスタック１３４としては、例えば固体酸化物形の燃料電池セルを組み合わせたものとすることができる。 The fuel cell device 200 shown in FIG. 7 includes a raw fuel supply device 132 for supplying raw fuel such as city gas, an oxygen-containing gas supply device 133 for supplying oxygen-containing gas to a fuel cell, a cell stack 134, and a cell stack 134. It includes a fuel cell module 136 with a reformer 135. In the fuel cell device 200 shown in FIG. 7, the fuel cell module 136 is surrounded by a two-dot chain line. The cell stack 134 may be, for example, a combination of solid oxide fuel cell cells.

燃料電池モジュール１３６のセルスタック１３４を構成する燃料電池セルの発電により生じた排ガスＨＭは、図１及び図７に示すように排気ダクト６０を経由して熱交換装置１００の加熱用熱交換器３０に供給される。また、燃料電池装置２００は、排ガスＨＭが加熱用熱交換器３０において循環熱媒体ＣＭと熱交換を行うことで生成された水を純水に処理するための水処理装置１３８と、水処理装置１３８にて処理された純水を貯水するための水タンク１３９とを備えている。水タンク１３９と加熱用熱交換器３０との間は水供給管１４０により接続されている。また、水タンク１３９に貯水された水は、水供給管１４１を通じて改質器１３５に供給されている。 As shown in FIGS. 1 and 7, the exhaust gas HM generated by the power generation of the fuel cell cells constituting the cell stack 134 of the fuel cell module 136 passes through the exhaust duct 60 and heat exchanger 30 for heating of the heat exchanger 100. Is supplied to. Further, the fuel cell device 200 includes a water treatment device 138 for treating the water generated by the exhaust gas HM exchanging heat with the circulating heat medium CM in the heat exchanger 30 for heating into pure water, and a water treatment device. It is equipped with a water tank 139 for storing the pure water treated in 138. The water tank 139 and the heating heat exchanger 30 are connected by a water supply pipe 140. Further, the water stored in the water tank 139 is supplied to the reformer 135 through the water supply pipe 141.

燃料電池装置２００は、更に、各種機器の動作を制御する制御部１４３と、燃料電池モジュール１３６において発電された直流電力を交流電力に変換し、変換された電力を外部負荷等に供給する電力調整部１４４とを備えている。 The fuel cell device 200 further has a control unit 143 that controls the operation of various devices, and a power adjustment that converts the DC power generated by the fuel cell module 136 into AC power and supplies the converted power to an external load or the like. It is provided with a unit 144.

制御部１４３は、燃料電池モジュール１３６における発電に合わせて、原燃料供給装置１３２及び酸素含有ガス供給装置１３３等の各装置の動作を制御する。これによって、改質器１３５に原燃料と水が供給され、改質器１３５で水蒸気改質を行うことにより、水素を含む燃料ガスが生成されて燃料電池セルに供給される。また、制御部１４３は、酸素含有ガス供給装置１３３を動作させることにより、燃料電池セルに酸素含有ガスを供給する。図７において制御信号の流れを破線で示している。各制御信号は、有線又は無線のいずれの手段を用いて送受信されてもよい。 The control unit 143 controls the operation of each device such as the raw material fuel supply device 132 and the oxygen-containing gas supply device 133 in accordance with the power generation in the fuel cell module 136. As a result, raw fuel and water are supplied to the reformer 135, and steam reforming is performed by the reformer 135 to generate fuel gas containing hydrogen and supply it to the fuel cell. Further, the control unit 143 supplies the oxygen-containing gas to the fuel cell by operating the oxygen-containing gas supply device 133. In FIG. 7, the flow of the control signal is shown by a broken line. Each control signal may be transmitted and received using either wired or wireless means.

また、制御部１４３は、熱媒タンク１０内の温度を取得し、その結果に基づいて熱交換装置１００内の冷却用ファン１６を制御する。なお、熱交換装置１００内の循環熱媒体ＣＭを後述する循環ポンプ４０で循環させるようにして、制御部１４３が当該循環ポンプ４０の制御を行うようにしてもよい。 Further, the control unit 143 acquires the temperature in the heat medium tank 10 and controls the cooling fan 16 in the heat exchange device 100 based on the result. The circulation heat medium CM in the heat exchange device 100 may be circulated by the circulation pump 40 described later, and the control unit 143 may control the circulation pump 40.

制御部１４３は、マイクロコンピュータを有しており、入出力インターフェイス、ＣＰＵ(Central Processing Unit)、ＲＡＭ(Random-Access Memory)およびＲＯＭ(Read-Only Memory)等を備えている。ＣＰＵは、制御プログラムを実行することができる。ＲＡＭは、例えばプログラムの実行に必要な変数や演算結果を一時的に記憶することができ、ＲＯＭは、例えば制御プログラムを記憶することができる。 The control unit 143 has a microcomputer, and includes an input / output interface, a CPU (Central Processing Unit), a RAM (Random-Access Memory), a ROM (Read-Only Memory), and the like. The CPU can execute the control program. The RAM can temporarily store variables and calculation results necessary for executing a program, for example, and the ROM can store a control program, for example.

（循環熱媒体の加熱時）
次に、燃料電池モジュール１３６からの排ガスＨＭにより循環熱媒体ＣＭを加熱する手順について図３等を用いて説明する。なお、ここでは、給湯水流路ＷＣ１，ＷＣ２に低温の給湯水ＷＭが連続的に供給されていないとして説明する。循環熱媒体ＣＭを加熱する際は、燃料電池モジュール１３６からの排ガスＨＭを加熱媒体として循環熱媒体ＣＭと熱交換を行わせる。加熱用熱交換器３０の上方（図３の右上）から排気ダクト６０経由で供給された排ガスＨＭは、加熱用熱交換器３０内の加熱媒体流路ＨＣを経由して流れ、循環熱媒体ＣＭと熱交換した後に加熱用熱交換器３０の下方（図３の左下）に設けられた排ガス流出口３８から外部に排出される（排ガスＨＭの流れを図３に黒矢印で示している）。 (When heating the circulating heat medium)
Next, a procedure for heating the circulating heat medium CM with the exhaust gas HM from the fuel cell module 136 will be described with reference to FIG. 3 and the like. Here, it is assumed that the low-temperature hot water supply water WM is not continuously supplied to the hot water supply water flow paths WC1 and WC2. When the circulating heat medium CM is heated, the exhaust gas HM from the fuel cell module 136 is used as a heating medium to exchange heat with the circulating heat medium CM. The exhaust gas HM supplied from above the heating heat exchanger 30 (upper right in FIG. 3) via the exhaust duct 60 flows through the heating medium flow path HC in the heating heat exchanger 30 and flows through the circulating heat medium CM. After exchanging heat with the heat exchanger 30, the exhaust gas is discharged to the outside from the exhaust gas outlet 38 provided below the heat exchanger 30 for heating (lower left in FIG. 3) (the flow of the exhaust gas HM is shown by a black arrow in FIG. 3).

加熱用熱交換器３０の第１循環媒体流路ＣＣ１及び第２循環媒体流路ＣＣ２には、熱媒タンク１０の下部開口１２から循環熱媒体ＣＭが供給されている（循環熱媒体ＣＭの流れを図３に白矢印で示している）。循環熱媒体ＣＭは、排ガスＨＭから供給された熱により温度上昇し、対流により加熱用熱交換器３０と第２給湯用熱交換器５０Ｂとの境界部に設けられた連通口３２を経由して上昇し、給湯用熱交換器５０へと向かう。 Circulating heat medium CM is supplied to the first circulation medium flow path CC1 and the second circulation medium flow path CC2 of the heat exchanger 30 for heating from the lower opening 12 of the heat medium tank 10 (flow of circulation heat medium CM). Is indicated by a white arrow in FIG. 3). The temperature of the circulating heat medium CM rises due to the heat supplied from the exhaust gas HM, and the temperature rises due to convection via the communication port 32 provided at the boundary between the heating heat exchanger 30 and the second hot water supply heat exchanger 50B. It rises and heads for the hot water heat exchanger 50.

対流により上昇した循環熱媒体ＣＭは、第２給湯用熱交換器５０Ｂの外側循環流路ＣＯ２及び第１給湯用熱交換器５０Ａの外側循環流路ＣＯ１を経由して、上部開口１４から熱媒タンク１０内へと戻る。このような構成によって、熱媒流路２０中にポンプを設けなくても、循環熱媒体ＣＭを排ガスＨＭにより加熱して、循環熱媒体ＣＭの上下方向の温度差に起因する対流によって上昇させることで再び熱媒タンク１０に還流させることができる。 The circulating heat medium CM raised by convection passes through the outer circulation flow path CO2 of the second hot water supply heat exchanger 50B and the outer circulation flow path CO1 of the first hot water supply heat exchanger 50A, and is a heat medium from the upper opening 14. Return to the tank 10. With such a configuration, even if a pump is not provided in the heat medium flow path 20, the circulating heat medium CM is heated by the exhaust gas HM and raised by convection due to the temperature difference in the vertical direction of the circulating heat medium CM. Can be recirculated to the heat medium tank 10 again.

なお、図７において、循環熱媒体ＣＭを加熱する際の循環熱媒体ＣＭの流れ方向を実線矢印で示している。 In FIG. 7, the flow direction of the circulating heat medium CM when the circulating heat medium CM is heated is indicated by a solid arrow.

（給湯水の加熱時）
次に、循環熱媒体ＣＭにより給湯水ＷＭを加熱する手順について説明する。給湯水ＷＭを加熱するには、図３の状態から、図８に示すように給湯水流路ＷＣ１，ＷＣ２に低温の給湯水ＷＭを供給する。図３の例では上方から下方に向けて流れるように給湯水ＷＭを供給している（給湯水ＷＭの流れを図８に黒矢印で示している）。これによって、外側循環流路ＣＯ１，ＣＯ２内の循環熱媒体ＣＭと給湯水流路ＷＣ１，ＷＣ２内の給湯水ＷＭとの間で熱回収用フィンＨＦ１，ＨＦ２により効果的に熱交換が行われる。その結果、給湯水ＷＭが加熱されると共に循環熱媒体ＣＭが冷却される。冷却された循環熱媒体ＣＭは、対流により下方に向かって下降する（循環熱媒体ＣＭの流れを図８に白矢印で示している）。図３に示した「循環熱媒体の加熱」により、熱媒タンク１０内の上部に高温の循環熱媒体ＣＭが収容されている（本実施形態では、熱媒タンク１０内の上部と下部の循環熱媒体ＣＭの温度差は３〜５℃である）。そのため、図８に示す循環熱媒体ＣＭの流動方向の逆転により、高温の循環熱媒体ＣＭが上部開口１４から継続的に外側循環流路ＣＯ１内に供給される。一方、給湯水流路ＷＣ１内には、給水管７０（図１参照）から低温の給湯水ＷＭが継続的に供給される。従って、高温の循環熱媒体ＣＭと低温の給湯水ＷＭとの温度差によって、循環熱媒体ＣＭと給湯水ＷＭとの間で効率的な熱交換が行われる。 (When heating hot water)
Next, a procedure for heating the hot water supply water WM with the circulating heat medium CM will be described. In order to heat the hot water supply water WM, a low temperature hot water supply water WM is supplied to the hot water supply water flow paths WC1 and WC2 as shown in FIG. 8 from the state of FIG. In the example of FIG. 3, the hot water supply water WM is supplied so as to flow from the upper side to the lower side (the flow of the hot water supply water WM is shown by a black arrow in FIG. 8). As a result, heat exchange is effectively performed by the heat recovery fins HF1 and HF2 between the circulating heat medium CM in the outer circulation flow paths CO1 and CO2 and the hot water supply water WM in the hot water supply water flow paths WC1 and WC2. As a result, the hot water supply water WM is heated and the circulating heat medium CM is cooled. The cooled circulating heat medium CM descends downward due to convection (the flow of the circulating heat medium CM is shown by a white arrow in FIG. 8). Due to the "heating of the circulating heat medium" shown in FIG. 3, the high-temperature circulating heat medium CM is housed in the upper part of the heat medium tank 10 (in the present embodiment, the circulation of the upper part and the lower part in the heat medium tank 10). The temperature difference of the heat medium CM is 3 to 5 ° C.). Therefore, due to the reversal of the flow direction of the circulating heat medium CM shown in FIG. 8, the high temperature circulating heat medium CM is continuously supplied into the outer circulation flow path CO1 from the upper opening 14. On the other hand, the low-temperature hot water supply water WM is continuously supplied from the water supply pipe 70 (see FIG. 1) into the hot water supply water flow path WC1. Therefore, efficient heat exchange is performed between the circulating heat medium CM and the hot water supply water WM due to the temperature difference between the high temperature circulating heat medium CM and the low temperature hot water supply water WM.

なお、本実施形態では、循環熱媒体ＣＭと給湯水ＷＭとの温度差を大きくするために、低温の給湯水ＷＭを給湯水流路ＷＣ１の上方から供給するように構成したが、この態様には限定されない。低温の給湯水ＷＭを給湯水流路ＷＣ２の下方から供給するように構成してもよい。 In the present embodiment, in order to increase the temperature difference between the circulating heat medium CM and the hot water supply water WM, the low temperature hot water supply water WM is supplied from above the hot water supply water flow path WC1. Not limited. The low-temperature hot water supply water WM may be configured to be supplied from below the hot water supply water flow path WC2.

なお、図７において、給湯水ＷＭを加熱する際の循環熱媒体ＣＭの流れ方向を破線矢印で示している。 In FIG. 7, the flow direction of the circulating heat medium CM when heating the hot water supply water WM is indicated by a broken line arrow.

図８の例では、給湯水ＷＭの加熱時に排ガスＨＭが加熱用熱交換器３０に供給されないと仮定しているがこの態様には限定されない。給湯水ＷＭを給湯用熱交換器５０により加熱しつつ、循環熱媒体ＣＭを更に加熱用熱交換器３０により加熱するようにしてもよい。 In the example of FIG. 8, it is assumed that the exhaust gas HM is not supplied to the heating heat exchanger 30 when the hot water supply water WM is heated, but the present invention is not limited to this embodiment. While the hot water supply water WM is heated by the hot water supply heat exchanger 50, the circulating heat medium CM may be further heated by the heating heat exchanger 30.

また、本実施形態では、低温の給湯水ＷＭを供給することによって循環熱媒体ＣＭの流動方向が自然対流により逆転するように構成したが、この態様には限定されない。循環熱媒体ＣＭの流路にポンプを設けて、給湯水ＷＭの加熱時に強制的に循環熱媒体ＣＭを上方から下方に向けて流動するように構成してもよい。 Further, in the present embodiment, the flow direction of the circulating heat medium CM is reversed by natural convection by supplying the low-temperature hot water supply water WM, but the present embodiment is not limited to this embodiment. A pump may be provided in the flow path of the circulating heat medium CM so that the circulating heat medium CM forcibly flows from the upper side to the lower side when the hot water supply water WM is heated.

（変形例）
図９は、本実施形態の変形例を示す図である。この変形例は、図１に示す実施形態と比較して、熱媒タンク１０の上部開口１４と給湯用熱交換器５０との間に循環ポンプ４０が設けられていること、並びに第１給湯用熱交換器５０Ａ及び第２給湯用熱交換器５０Ｂが加熱用熱交換器３０と略平行になるように配置されていることを除いて概ね近似した構成を有している。ここでは、図１に示す実施形態との差異点を中心に説明する。なお、図１に示す実施形態と構成又は機能が共通する部位には同一の符号を付して説明する。 (Modification example)
FIG. 9 is a diagram showing a modified example of the present embodiment. In this modification, as compared with the embodiment shown in FIG. 1, a circulation pump 40 is provided between the upper opening 14 of the heat medium tank 10 and the hot water supply heat exchanger 50, and the first hot water supply is provided. The heat exchanger 50A and the second hot water supply heat exchanger 50B have substantially similar configurations except that they are arranged so as to be substantially parallel to the heating heat exchanger 30. Here, the differences from the embodiment shown in FIG. 1 will be mainly described. The parts having the same configuration or function as those of the embodiment shown in FIG. 1 will be described with the same reference numerals.

図９に示す変形例では、熱媒タンク１０の上部開口１４と給湯用熱交換器５０との間に循環ポンプ４０が設けられている。循環ポンプ４０は、循環熱媒体ＣＭの流動を制御する。この変形例では、「循環熱媒体の加熱」が行われているときは、循環ポンプ４０は作動させない。そして循環熱媒体ＣＭは、排ガスＨＭと熱交換を行うことで加熱され、自然対流により上方へ移動する。他方、「給湯水の加熱」が行われているときは、循環ポンプ４０を作動させる。すると循環熱媒体ＣＭは、図９に白矢印で示す方向に強制対流する。これによって、高温の循環熱媒体ＣＭが上部開口１４から継続的に給湯用熱交換器５０内の外側循環流路ＣＯ１に供給される。また、給湯水流路ＷＣ１内には、給水管７０から低温の給湯水ＷＭが継続的に供給される。従って、高温の循環熱媒体ＣＭと低温の給湯水ＷＭとの温度差によって、循環熱媒体ＣＭと給湯水ＷＭとの間で効率的な熱交換が行われる。特にこの変形例では、給湯開始時に循環ポンプ４０を作動させ、循環熱媒体ＣＭの流動方向を速やかに逆転させることができる。従って、給湯開始の指示を受けてから給湯水ＷＭの温度を上昇させるまでの時間を短縮することができる。 In the modified example shown in FIG. 9, a circulation pump 40 is provided between the upper opening 14 of the heat medium tank 10 and the hot water supply heat exchanger 50. The circulation pump 40 controls the flow of the circulation heat medium CM. In this modification, the circulation pump 40 is not operated when "heating of the circulating heat medium" is being performed. Then, the circulating heat medium CM is heated by exchanging heat with the exhaust gas HM, and moves upward by natural convection. On the other hand, when "heating of hot water supply water" is being performed, the circulation pump 40 is operated. Then, the circulating heat medium CM is forcibly convected in the direction indicated by the white arrow in FIG. As a result, the high-temperature circulating heat medium CM is continuously supplied from the upper opening 14 to the outer circulation flow path CO1 in the hot water supply heat exchanger 50. Further, low-temperature hot water supply water WM is continuously supplied from the water supply pipe 70 into the hot water supply water flow path WC1. Therefore, efficient heat exchange is performed between the circulating heat medium CM and the hot water supply water WM due to the temperature difference between the high temperature circulating heat medium CM and the low temperature hot water supply water WM. In particular, in this modification, the circulation pump 40 can be operated at the start of hot water supply to quickly reverse the flow direction of the circulation heat medium CM. Therefore, it is possible to shorten the time from receiving the instruction to start the hot water supply to raising the temperature of the hot water supply water WM.

以上述べたように、本実施形態の熱交換装置１００は、循環熱媒体ＣＭを収容する熱媒タンク１０と、熱媒タンク１０の下部開口１２に熱媒流路２０を介して連結され、流入する加熱媒体（排ガスＨＭ）と熱交換して循環熱媒体ＣＭを加熱する加熱用熱交換器３０と、熱媒タンク１０の上部開口１４に熱媒流路２０を介して連結されると共に加熱用熱交換器３０の上方に配置され、循環熱媒体ＣＭと熱交換して給湯水ＷＭを加熱する給湯用熱交換器５０とを備えるように構成した。このような構成の採用によって、熱媒流路２０中にポンプを設けなくても、循環熱媒体ＣＭを排ガスＨＭにより加熱して、循環熱媒体ＣＭの上下方向の温度差に起因する対流によって上昇させることで再び熱媒タンク１０に還流させることができる。従って、熱交換装置１００を小型化することができる。 As described above, the heat exchange device 100 of the present embodiment is connected to the heat medium tank 10 accommodating the circulating heat medium CM and the lower opening 12 of the heat medium tank 10 via the heat medium flow path 20 and flows in. The heat exchanger 30 for heating, which heats the circulating heat medium CM by exchanging heat with the heating medium (exhaust exhaust gas HM), is connected to the upper opening 14 of the heat medium tank 10 via the heat medium flow path 20 and for heating. It is arranged above the heat exchanger 30 and is configured to include a hot water supply heat exchanger 50 that heats the hot water supply water WM by exchanging heat with the circulating heat medium CM. By adopting such a configuration, the circulating heat medium CM is heated by the exhaust gas HM without providing a pump in the heat medium flow path 20, and rises due to convection caused by the temperature difference in the vertical direction of the circulating heat medium CM. By allowing the heat medium tank 10 to return to the heat medium tank 10 again. Therefore, the heat exchange device 100 can be miniaturized.

また、本実施形態では、加熱用熱交換器３０は、加熱媒体の流動方向に直交する方向に隣接して配置される少なくとも３つの媒体流路を有し、加熱媒体の媒体流路（加熱媒体流路ＨＣ）の両側に循環熱媒体ＣＭの媒体流路（第１循環媒体流路ＣＣ１及び第２循環媒体流路ＣＣ２）が隣接して配置されるように構成した。このような構成の採用によって、加熱媒体流路ＨＣは、排ガスＨＭ（加熱媒体）の流動方向に直交する方向において第１循環媒体流路ＣＣ１と第２循環媒体流路ＣＣ２の間に挟まれているので、排ガスＨＭから外部に逃げる熱量を低減して、排ガスＨＭの熱を効率よく循環熱媒体ＣＭに伝えることができる。 Further, in the present embodiment, the heating heat exchanger 30 has at least three medium flow paths arranged adjacent to each other in a direction orthogonal to the flow direction of the heating medium, and the medium flow path of the heating medium (heating medium). The medium flow paths (first circulation medium flow path CC1 and second circulation medium flow path CC2) of the circulation heat medium CM are arranged adjacent to each other on both sides of the flow path HC). By adopting such a configuration, the heating medium flow path HC is sandwiched between the first circulation medium flow path CC1 and the second circulation medium flow path CC2 in the direction orthogonal to the flow direction of the exhaust gas HM (heating medium). Therefore, the amount of heat escaping from the exhaust gas HM to the outside can be reduced, and the heat of the exhaust gas HM can be efficiently transferred to the circulating heat medium CM.

また、本実施形態では、少なくとも３つの媒体流路は、加熱媒体の流動方向に直交する径方向に隣接して配置されるように構成した。このような構成の採用によって、加熱媒体流路ＨＣは、径方向において第１循環媒体流路ＣＣ１と第２循環媒体流路ＣＣ２の間に挟まれているので、排ガスＨＭから外部に逃げる熱量を更に効果的に低減して、排ガスＨＭの熱を効率よく循環熱媒体ＣＭに伝えることができる。 Further, in the present embodiment, at least three medium flow paths are arranged so as to be adjacent to each other in the radial direction orthogonal to the flow direction of the heating medium. By adopting such a configuration, the heating medium flow path HC is sandwiched between the first circulation medium flow path CC1 and the second circulation medium flow path CC2 in the radial direction, so that the amount of heat escaping from the exhaust gas HM to the outside can be reduced. It can be further effectively reduced and the heat of the exhaust gas HM can be efficiently transferred to the circulating heat medium CM.

また、本実施形態では、給湯用熱交換器５０は、循環熱媒体ＣＭの流動方向に直交する径方向に隣接して配置される少なくとも２つの媒体流路を有し、給湯水ＷＭの媒体流路（給湯水流路ＷＣ１，ＷＣ２）の径方向外側に循環熱媒体ＣＭの媒体流路（外側循環流路ＣＯ１，ＣＯ２）が隣接して配置され、循環熱媒体ＣＭの媒体流路内には給湯水ＷＭの媒体流路を形成する導管の外周面から径方向外側に突出する熱回収用フィンＨＦ１，ＨＦ２が形成されるように構成した。このような構成の採用によって、給湯水流路ＷＣ１，ＷＣ２が外側循環流路ＣＯ１，ＣＯ２によって径方向外側から囲まれることに加え、熱回収用フィンＨＦ１，ＨＦ２によって両流路間の熱交換が更に促進される。従って、循環熱媒体ＣＭの熱を効率よく給湯水ＷＭに伝えることができる。 Further, in the present embodiment, the hot water supply heat exchanger 50 has at least two medium flow paths arranged adjacent to each other in the radial direction orthogonal to the flow direction of the circulating heat medium CM, and the medium flow of the hot water supply water WM. The medium flow path (outer circulation flow path CO1, CO2) of the circulating heat medium CM is arranged adjacent to the radial outside of the passage (hot water supply water flow path WC1, WC2), and hot water is supplied in the medium flow path of the circulating heat medium CM. The heat recovery fins HF1 and HF2 projecting outward in the radial direction from the outer peripheral surface of the conduit forming the medium flow path of the water WM are formed. By adopting such a configuration, the hot water supply water passages WC1 and WC2 are surrounded by the outer circulation flow paths CO1 and CO2 from the outside in the radial direction, and the heat recovery fins HF1 and HF2 further exchange heat between the two flow paths. Be promoted. Therefore, the heat of the circulating heat medium CM can be efficiently transferred to the hot water supply water WM.

また、本実施形態では、熱媒タンク１０の下部側面に、冷却用ファン１６が配置されるように構成した。このような構成の採用によって、冷却用ファン１６からの空気が熱媒タンク１０の下部側面で循環熱媒体ＣＭにより温められて上昇する。従って、空気の強制対流に加えて自然対流が起こり易いようにして、熱媒タンク１０内の循環熱媒体ＣＭを効果的に冷却することができる。 Further, in the present embodiment, the cooling fan 16 is arranged on the lower side surface of the heat medium tank 10. By adopting such a configuration, the air from the cooling fan 16 is heated by the circulating heat medium CM on the lower side surface of the heat medium tank 10 and rises. Therefore, the circulating heat medium CM in the heat medium tank 10 can be effectively cooled by making it easy for natural convection to occur in addition to the forced convection of air.

また、本実施形態では、熱媒タンク１０の側面の少なくとも一部が断熱材１１により覆われており、断熱材１１と熱媒タンク１０の側面との間には、冷却用ファン１６に連通する空気流路が形成されるように構成した。このような構成の採用によって、冷却用ファン１６からの空気が、断熱材１１と熱媒タンク１０の側面との間の狭所を通って流れるので、強制対流により熱媒タンク１０の側面における熱伝達が促進される。従って、熱媒タンク１０内の循環熱媒体ＣＭを効果的に冷却することができる。また、冷却用ファン１６を作動させていないときは、熱媒タンク１０の側面からの放熱が断熱材１１によって低減される。従って、冷却用ファン１６停止時における熱媒タンク１０内の循環熱媒体ＣＭの保温性能を向上させることができる。 Further, in the present embodiment, at least a part of the side surface of the heat medium tank 10 is covered with the heat insulating material 11, and the cooling fan 16 communicates between the heat insulating material 11 and the side surface of the heat medium tank 10. It was configured so that an air flow path was formed. By adopting such a configuration, the air from the cooling fan 16 flows through the narrow space between the heat insulating material 11 and the side surface of the heat medium tank 10, so that the heat on the side surface of the heat medium tank 10 is generated by forced convection. Communication is promoted. Therefore, the circulating heat medium CM in the heat medium tank 10 can be effectively cooled. Further, when the cooling fan 16 is not operated, heat dissipation from the side surface of the heat medium tank 10 is reduced by the heat insulating material 11. Therefore, it is possible to improve the heat retention performance of the circulating heat medium CM in the heat medium tank 10 when the cooling fan 16 is stopped.

また、本実施形態では、断熱材１１と熱媒タンク１０の側面との間には、冷却用ファン１６と熱媒タンク１０の上部側面を連通させる第１空気流路ＣＵと、上部側面と熱媒タンク１０の下部側面に配置された開口１５とを連通させる第２空気流路ＣＤとが形成されるように構成した。このような構成の採用によって、冷却用ファン１６を作動させたときは、第１空気流路ＣＵ経由で熱媒タンク１０の上部に導かれた空気を更に第２空気流路ＣＤ経由で開口１５まで導くことができる。従って、空気が熱媒タンク１０の側面を強制対流することにより熱媒タンク１０内の循環熱媒体ＣＭを効率的に冷却することができる。他方、冷却用ファン１６の作動を停止させたときは、熱媒タンク１０の側面によって温められた空気は上方に移動し、水平流路ＣＨ及びその近傍に滞留する。従って、熱媒タンク１０の側面において自然対流を起こりにくくすることができるので、熱媒タンク１０内の循環熱媒体ＣＭの温度を下がりにくくすることができる。 Further, in the present embodiment, between the heat insulating material 11 and the side surface of the heat medium tank 10, a first air flow path CU that communicates the cooling fan 16 and the upper side surface of the heat medium tank 10 with the upper side surface and heat. A second air flow path CD that communicates with the opening 15 arranged on the lower side surface of the medium tank 10 is formed. By adopting such a configuration, when the cooling fan 16 is operated, the air guided to the upper part of the heat medium tank 10 via the first air flow path CU is further opened through the second air flow path CD. Can be guided to. Therefore, the circulating heat medium CM in the heat medium tank 10 can be efficiently cooled by forcibly convection of the side surface of the heat medium tank 10. On the other hand, when the operation of the cooling fan 16 is stopped, the air warmed by the side surface of the heat medium tank 10 moves upward and stays in the horizontal flow path CH and its vicinity. Therefore, since natural convection can be made difficult to occur on the side surface of the heat medium tank 10, the temperature of the circulating heat medium CM in the heat medium tank 10 can be made difficult to decrease.

また、本実施形態では、熱媒タンク１０の側面に、複数の凸部１３が形成されるように構成した。このような構成の採用によって、熱媒タンク１０の側面の表面積を増大させて、熱媒タンク１０内の循環熱媒体ＣＭを冷却し易くすることができる。また、凸部１３を断熱材１１で覆うことによって、容易に凸部１３近傍に第１空気流路ＣＵ及び第２空気流路ＣＤを形成することができる。更に、熱媒タンク１０の側面の少なくとも一部を断熱材１１で覆うことにより、凸部１３の頂部が断熱材１１に当接するため、熱媒タンク１０が内圧によって膨らむのを低減することができる。 Further, in the present embodiment, a plurality of convex portions 13 are formed on the side surface of the heat medium tank 10. By adopting such a configuration, the surface area of the side surface of the heat medium tank 10 can be increased, and the circulating heat medium CM in the heat medium tank 10 can be easily cooled. Further, by covering the convex portion 13 with the heat insulating material 11, the first air flow path CU and the second air flow path CD can be easily formed in the vicinity of the convex portion 13. Further, by covering at least a part of the side surface of the heat medium tank 10 with the heat insulating material 11, the top of the convex portion 13 comes into contact with the heat insulating material 11, so that the heat medium tank 10 can be reduced from swelling due to the internal pressure. ..

また、本実施形態では、熱媒タンク１０の上部開口１４と給湯用熱交換器５０との間に循環ポンプ４０を設け、循環ポンプ４０は熱媒タンク１０から給湯用熱交換器５０に向かう方向に循環熱媒体ＣＭを流すように作動するように構成した。このような構成の採用によって、給湯開始時に循環ポンプ４０を作動させ、循環熱媒体ＣＭの流動方向を速やかに逆転させることができる。従って、循環熱媒体ＣＭと給湯水ＷＭとの熱交換の効率を向上させると共に、給湯開始の指示を受けてから給湯水ＷＭの温度を上昇させるまでの時間を短縮することができる。 Further, in the present embodiment, a circulation pump 40 is provided between the upper opening 14 of the heat medium tank 10 and the hot water supply heat exchanger 50, and the circulation pump 40 is directed from the heat medium tank 10 toward the hot water supply heat exchanger 50. It was configured to operate so as to flow the circulating heat medium CM. By adopting such a configuration, the circulation pump 40 can be operated at the start of hot water supply, and the flow direction of the circulation heat medium CM can be quickly reversed. Therefore, the efficiency of heat exchange between the circulating heat medium CM and the hot water supply water WM can be improved, and the time from receiving the instruction to start the hot water supply to raising the temperature of the hot water supply water WM can be shortened.

また、本実施形態の燃料電池システム３００は、燃料電池装置２００と、上記いずれかの熱交換装置１００とを備える燃料電池システム３００であって、燃料電池装置２００における燃料の燃焼によって生成された排ガスＨＭを加熱媒体として熱交換装置１００を作動させるように構成した。このような構成の採用によって、燃料電池装置２００における発電によって生成された排ガスＨＭを効率的に活用して給湯水ＷＭの加熱を行うことができる。 Further, the fuel cell system 300 of the present embodiment is a fuel cell system 300 including a fuel cell device 200 and any of the above heat exchange devices 100, and exhaust gas generated by combustion of fuel in the fuel cell device 200. The heat exchange device 100 was configured to operate using the HM as a heating medium. By adopting such a configuration, the exhaust gas HM generated by the power generation in the fuel cell device 200 can be efficiently utilized to heat the hot water supply water WM.

本開示を諸図面や実施例に基づき説明してきたが、当業者であれば本開示に基づき種々の変形や修正を行うことが容易であることに注意されたい。従って、これらの変形や修正は本発明の範囲に含まれることに留意されたい。例えば、各構成部に含まれる機能などは論理的に矛盾しないように再配置可能であり、複数の構成部を１つに組み合わせたり、或いは分割したりすることが可能である。本発明の範囲にはこれらも包含されるものと理解されたい。 Although the present disclosure has been described based on the drawings and examples, it should be noted that those skilled in the art can easily make various modifications and modifications based on the present disclosure. Therefore, it should be noted that these modifications and modifications are included in the scope of the present invention. For example, the functions included in each component can be rearranged so as not to be logically inconsistent, and a plurality of components can be combined or divided into one. It should be understood that these are also included in the scope of the present invention.

例えば、本実施形態では、加熱媒体として燃料電池装置２００からの排ガスＨＭを利用するように構成したが、この態様には限定されない。燃料電池装置２００以外の他の装置からの高温の液体又は気体を加熱媒体としてもよい。 For example, in the present embodiment, the exhaust gas HM from the fuel cell device 200 is used as the heating medium, but the present embodiment is not limited to this embodiment. A high-temperature liquid or gas from a device other than the fuel cell device 200 may be used as the heating medium.

また、本実施形態では、熱媒タンク１０の側面のほぼ全領域を断熱材１１で覆うように構成したが、この態様には限定されない。熱媒タンク１０の側面の一部のみを断熱材１１によって覆うように構成してもよい。 Further, in the present embodiment, the heat insulating material 11 covers almost the entire side surface of the heat medium tank 10, but the present embodiment is not limited to this embodiment. Only a part of the side surface of the heat medium tank 10 may be covered with the heat insulating material 11.

また、本実施形態では、給湯水流路ＷＣ１，ＷＣ２を形成する導管の外周面から径方向外側に突出する熱回収用フィンＨＦ１，ＨＦ２が形成されるように構成したが、この態様には限定されず、熱回収用フィンＨＦ１，ＨＦ２を設けない構成としてもよい。また、給湯水流路ＷＣ１，ＷＣ２を形成する導管の外周面に凹凸を設けたり表面処理を施すことにより熱伝達を促進するようにしてもよい。 Further, in the present embodiment, the heat recovery fins HF1 and HF2 protruding radially outward from the outer peripheral surface of the conduit forming the hot water supply water flow paths WC1 and WC2 are formed, but the present embodiment is limited to this embodiment. Instead, the heat recovery fins HF1 and HF2 may not be provided. Further, heat transfer may be promoted by providing unevenness or surface treatment on the outer peripheral surface of the conduit forming the hot water supply water passages WC1 and WC2.

また、本実施形態では、熱媒タンク１０の下部側面に、冷却用ファン１６が配置されるように構成したが、この態様には限定されない。冷却用ファン１６を設けない構成としてもよいし、熱媒タンク１０の下部側面以外の場所に設けてもよい。また、本実施形態では、冷却用ファン１６が空気を吸い込んで熱媒タンク１０の側面に吹き付ける方向に作動させているが、空気を噴出させる方向に作動させてもよい。その場合、開口１５が吸気口となる。 Further, in the present embodiment, the cooling fan 16 is arranged on the lower side surface of the heat medium tank 10, but the present embodiment is not limited to this embodiment. The cooling fan 16 may not be provided, or may be provided at a location other than the lower side surface of the heat medium tank 10. Further, in the present embodiment, the cooling fan 16 is operated in the direction of sucking air and blowing it onto the side surface of the heat medium tank 10, but it may be operated in the direction of ejecting air. In that case, the opening 15 becomes an intake port.

また、本実施形態では、熱媒タンク１０の下部側面に冷却用ファン１６及び開口１５を設けるように構成したが、この態様には限定されない。冷却用ファン１６及び開口１５は、熱媒タンク１０の下部以外の場所に配置してもよい。 Further, in the present embodiment, the cooling fan 16 and the opening 15 are provided on the lower side surface of the heat medium tank 10, but the present embodiment is not limited to this embodiment. The cooling fan 16 and the opening 15 may be arranged at a place other than the lower part of the heat medium tank 10.

また、本実施形態では、熱媒タンク１０の側面に複数の凸部１３を設けるように構成したが、この態様には限定されず、複数の凸部１３を設けなくてもよい。また、熱媒タンク１０の側面での熱伝達を促進したり、熱媒タンク１０の内圧に対する変形を低減する他の形状を採用してもよい。 Further, in the present embodiment, a plurality of convex portions 13 are provided on the side surface of the heat medium tank 10, but the present invention is not limited to this embodiment, and the plurality of convex portions 13 may not be provided. Further, another shape may be adopted that promotes heat transfer on the side surface of the heat medium tank 10 or reduces deformation of the heat medium tank 10 with respect to the internal pressure.

本実施形態では、燃料電池装置２００が備える制御部１４３が冷却用ファン１６及び循環ポンプ等を制御するように構成したが、この態様には限定されず、熱交換装置１００が独自の制御部を備え、当該独自の制御部が冷却用ファン１６及び循環ポンプを制御するようにしてもよい。 In the present embodiment, the control unit 143 included in the fuel cell device 200 is configured to control the cooling fan 16, the circulation pump, and the like, but the present invention is not limited to this mode, and the heat exchange device 100 has its own control unit. The unique control unit may control the cooling fan 16 and the circulation pump.

本実施形態の熱交換装置１００に供給される給湯水ＷＭは、燃料電池装置２００又は給湯装置等が有する制御部により流量制御されるように構成することができる。また、熱交換装置１００が独自の制御部を備え、当該独自の制御部が給湯水ＷＭの流量制御を行うようにしてもよい。 The hot water supply water WM supplied to the heat exchange device 100 of the present embodiment can be configured so that the flow rate is controlled by a control unit included in the fuel cell device 200 or the hot water supply device. Further, the heat exchange device 100 may be provided with a unique control unit, and the unique control unit may control the flow rate of the hot water supply water WM.

本開示によれば、ポンプを用いない簡素な構成でも媒体間で熱交換が可能な熱交換装置１００、及び燃料電池システム３００を提案することが可能となる。 According to the present disclosure, it is possible to propose a heat exchange device 100 and a fuel cell system 300 that can exchange heat between media even with a simple configuration that does not use a pump.

１０熱媒タンク
１１断熱材
１２下部開口
１３，１３Ａ，１３Ｂ凸部
１４上部開口
１５開口
１６冷却用ファン
２０熱媒流路
３０加熱用熱交換器
３２連通口
３８排ガス流出口
４０循環ポンプ
５０給湯用熱交換器
５０Ａ第１給湯用熱交換器
５０Ｂ第２給湯用熱交換器
５２連結部
６０排気ダクト
７０給水管
７２給湯管
１００熱交換装置
１３２原燃料供給装置
１３３酸素含有ガス供給装置
１３４セルスタック
１３５改質器
１３６燃料電池モジュール
１３８水処理装置
１３９水タンク
１４０水供給管
１４１水供給管
１４３制御部
１４４電力調整部
ＣＣ１第１循環媒体流路
ＣＣ２第２循環媒体流路
ＣＤ第２空気流路
ＣＨ水平流路
ＣＭ循環熱媒体
ＣＯ１，ＣＯ２外側循環流路
ＣＵ第１空気流路
ＨＦ１，ＨＦ２熱回収用フィン
ＨＣ加熱媒体流路
ＨＭ排ガス（加熱媒体）
ＷＣ１，ＷＣ２給湯水流路
ＷＣＣ連結流路
ＷＭ給湯水 10 Heat medium tank 11 Insulation material 12 Lower opening 13, 13A, 13B Convex part 14 Upper opening 15 Open 16 Cooling fan 20 Heat medium flow path 30 Heat exchanger for heating 32 Communication port 38 Exhaust gas outlet 40 Circulation pump 50 For hot water supply Heat exchanger 50A 1st hot water supply heat exchanger 50B 2nd hot water supply heat exchanger 52 Connection part 60 Exhaust duct 70 Water supply pipe 72 Hot water supply pipe 100 Heat exchanger 132 Raw fuel supply device 133 Oxygen-containing gas supply device 134 Cell stack 135 Reformer 136 Fuel cell module 138 Water treatment device 139 Water tank 140 Water supply pipe 141 Water supply pipe 143 Control unit 144 Power adjustment unit CC1 1st circulation medium flow path CC2 2nd circulation medium flow path CD 2nd air flow path CH Horizontal flow path CM Circulation heat medium CO1, CO2 Outer circulation flow path CU 1st air flow path HF1, HF2 Heat recovery fin HC Heating medium flow path HM Exhaust gas (heating medium)
WC1, WC2 hot water supply flow path WCC connection flow path WM hot water supply water

Claims

A heat medium tank that houses the circulating heat medium and
A heat exchanger for heating, which is connected to the lower opening of the heat medium tank and exchanges heat with the inflowing heating medium to heat the circulating heat medium.
It is characterized by being connected to the upper opening of the heat medium tank and arranged above the heating heat exchanger, and provided with a hot water supply heat exchanger that exchanges heat with the circulating heat medium to heat the hot water supply water. Heat exchange device.

The heating heat exchanger has at least three medium flow paths arranged adjacent to each other in a direction orthogonal to the flow direction of the heating medium, and the circulating heat medium is provided on both sides of the medium flow path of the heating medium. The heat exchange device according to claim 1, wherein the medium flow paths are arranged adjacent to each other.

The heat exchange device according to claim 2, wherein the at least three medium flow paths are arranged adjacent to each other in a radial direction orthogonal to the flow direction of the heating medium.

The hot water supply heat exchanger has at least two medium flow paths arranged adjacent to each other in the radial direction orthogonal to the flow direction of the circulating heat medium, and is said to be radially outside the medium flow path of the hot water supply water. The medium flow paths of the circulating heat medium are arranged adjacent to each other, and the heat recovery fins projecting radially outward from the outer peripheral surface of the conduit forming the medium flow path of the hot water supply water in the medium flow path of the circulating heat medium. The heat exchange device according to any one of claims 1 to 3, wherein the heat exchange device is formed.

The heat exchange device according to any one of claims 1 to 4, wherein a cooling fan is arranged on the lower side surface of the heat medium tank.

At least a part of the side surface of the heat medium tank is covered with a heat insulating material, and an air flow path communicating with the cooling fan is formed between the heat insulating material and the side surface of the heat medium tank. , The heat exchange device according to claim 5.

Between the heat insulating material and the side surface of the heat medium tank, there is a first air flow path that communicates the cooling fan and the upper side surface of the heat medium tank, and the upper side surface and the lower side surface of the heat medium tank. The heat exchange device according to claim 6, wherein a second air flow path for communicating with the arranged opening is formed.

The heat exchange device according to any one of claims 1 to 7, wherein a plurality of convex portions are formed on the side surface of the heat medium tank.

A circulation pump is provided between the upper opening of the heat medium tank and the hot water supply heat exchanger, and the circulation pump operates so as to flow the circulating heat medium from the heat medium tank toward the hot water supply heat exchanger. The heat exchange device according to any one of claims 1 to 8.

A fuel cell system including a fuel cell device and the heat exchange device according to any one of claims 1 to 9, wherein the heat exhaust gas generated by combustion of fuel in the fuel cell device is used as a heating medium. A fuel cell system that activates a switching device.