JP3655189B2

JP3655189B2 - Water heater with remembrance

Info

Publication number: JP3655189B2
Application number: JP2000361623A
Authority: JP
Inventors: 幸弘鈴木; 郁朗足立
Original assignee: Rinnai Corp
Current assignee: Rinnai Corp
Priority date: 2000-11-28
Filing date: 2000-11-28
Publication date: 2005-06-02
Anticipated expiration: 2020-11-28
Also published as: JP2002162101A

Description

【０００１】
【発明の属する技術分野】
本発明は、給湯用の熱交換器と追焚き用の熱交換器の一部が重複した、いわゆる一缶二水路式の追焚き付き給湯器における湯張り制御に関する。
【０００２】
【従来の技術】
近年、省スペースの目的から、給湯用熱交換器と追焚き用熱交換器の一部を重複させて設置したいわゆる一缶二水路式の追焚き付き給湯器が開発されている。かかる給湯器においては、一端が水道と接続されて水道から供給される水を給湯用熱交換器で加熱して他端から湯を供給する給湯管路と、両端が浴槽と連通されて、浴槽に滞留した湯水を前記追焚き熱交換器で加熱しながら循環させるための追焚き管路とが備えられている。
【０００３】
そして、給湯を行う場合には、給湯管路から供給される湯の温度が所定の目標温度となるように給湯熱交換器の加熱量が決定されてフィードフォワード制御される。また、給湯管路から供給される湯の温度を検出する給湯温度センサが設けられ、該給湯温度センサの検出温度が目標給湯温度と一致するように加熱量がフィードバック制御によりさらに微調整される。
【０００４】
かかる追焚き付き給湯器において、給湯管路と追焚き管路とを連通させる湯張り中継管を設けて、給湯管路から該湯張り中継管と追焚き管路とを介して浴槽に湯張りするようにした給湯器が提案されている。
【０００５】
このように追焚き管路を利用して湯張りを行う場合、追焚き管路の追焚き熱交換器により加熱される側を経由して浴槽に至る第１湯張り経路と、追焚き管路の追焚き熱交換器により加熱されない側を経由して浴槽に至る第２湯張り経路という２つの経路を介して、いわゆる両搬送により給湯管路から浴槽に湯を供給するのが一般的である。
【０００６】
しかし、両搬送によって湯張りを行うと、第２湯張り経路側では、給湯管路から供給される目標温度の湯がそのまま浴槽に供給されるが、第１湯張り経路側では、給湯管路から供給された目標温度の湯が追焚き熱交換器でさらに昇温されて浴槽に供給される。
【０００７】
そのため、通常の（湯張り以外の）給湯を行う場合のように、給湯管路から供給される湯の温度が目標温度となるようにフィードバック制御を行うと、浴槽に貯められる湯の温度が目標温度よりも高くなってしまうという不都合がある。そこで、従来は、湯張りを行うときにはフィードバック制御を禁止してフィードフォワード制御のみで給湯温度を制御し、さらに追焚き熱交換器での加熱分を見込んで給湯熱交換器による加熱量を減少させるようにしていた。
【０００８】
しかし、この場合には、加熱量をどの程度減少させるかを決定することが難しく、浴槽の湯張り温度を精度良く制御することが難しいという不都合があった。
【０００９】
【発明が解決しようとする課題】
本発明は、上記背景を鑑みてなされたものであり、一缶二水路式の追焚き付き給湯器において、簡易な処理により浴槽への湯張り温度を精度良く制御することができる給湯器を提供することを目的とする。
【００１０】
【課題を解決するための手段】
本発明は上記目的を達成するためになされたものであり、両端が浴槽と接続されて浴槽に滞留した湯水を循環させて追焚きするための追焚き管路と、一端が水道と接続されて水道から供給される水を加熱して他端から給湯するための給湯管路と、該追焚き管路を流れる湯水を加熱する追焚き熱交換器と、その一部が該追焚き熱交換器と重複して該給湯管路を流れる水を加熱する給湯熱交換器と、該追焚き熱交換器と該給湯熱交換器とを加熱する加熱手段と、該加熱手段の加熱量を調節する加熱量調節手段とを備えた給湯器に関する。
【００１１】
先ず、本発明の第１の態様は、給湯と追焚きとを同時に実行するときに前記加熱手段が発生する熱量のうち前記給湯熱交換器による水の加熱と前記追焚き熱交換器による湯水の加熱とに実際に使用される熱量の割合である第１熱効率のデータと、給湯のみを単独で実行するときに前記加熱手段が発生する熱量のうち前記給湯熱交換器による水の加熱に実際に使用される熱量の割合である第２熱効率のデータとを記憶した熱効率データ記憶手段と、前記給湯管路から所定温度の湯が供給されるように前記加熱量調節手段により前記加熱手段の加熱量を制御し、追焚きと給湯とを同時に実行するときは前記第１熱効率のデータに基づいて前記加熱手段の加熱量を決定し、給湯のみを単独で実行するときには前記第２熱効率のデータに基づいて前記加熱手段の加熱量を決定する給湯制御手段とを備えた追焚き付き給湯器の改良に関する。
【００１２】
そして、前記給湯管の前記給湯熱交換器により水が加熱される箇所の下流側と前記追焚き管路とを連通して、前記給湯熱交換器により加熱生成された湯を、前記給湯管路から前記追焚き熱交換器により加熱される側の前記追焚き管路を経由して前記浴槽に供給する第１湯張り経路と、前記給湯管路から前記追焚き熱交換器により加熱されない側の前記追焚き管路を経由して前記浴槽に供給する第２湯張り経路とを形成する湯張り連通管を備え、前記給湯制御手段は、前記第１湯張り経路と前記第２湯張り経路とを介して前記給湯管路から前記浴槽に湯を供給するときには、前記第１熱効率に基づいて前記加熱手段の加熱量を決定することを特徴とする。
【００１３】
かかる本発明において、前記熱効率記憶手段には、給湯と追焚きとを同時に実行する場合に応じた前記第１熱効率のデータと、給湯のみを単独で実行する場合に応じた前記第２熱効率のデータとが記憶されている。そして、前記給湯管路から前記第１湯張り経路と前記第２湯張り経路とを介して浴槽に湯を供給するという状況は、前記給湯熱交換器により前記給湯管路内を流れる水が加熱されると共に、前記追焚き熱交換器により前記追焚き管路内を流れる湯水が加熱されるという点で、給湯と追焚きとを同時に実行する状況と共通する。
【００１４】
そのため、前記給湯管路から前記第１湯張り経路と前記第２湯張り経路とを介して前記浴槽に湯を供給する場合に、前記第１熱効率データに基づいて前記加熱手段の加熱量を決定することにより、前記給湯制御手段は前記浴槽に供給される湯の温度を精度良く制御することができる。また、この場合には、前記加熱手段の加熱量を補正するための複雑な処理を行う必要がない。
【００１５】
次に、本発明の第２の態様は、給湯と追焚きとを同時に実行するときに前記加熱手段により与えられて前記給湯熱交換器による水の加熱と前記追焚き熱交換器による湯水の加熱とに使用される第１熱量のデータと、給湯のみを単独で実行するときに前記加熱手段により与えられて前記給湯熱交換器による水の加熱に使用される第２熱量のデータとを記憶した熱量データ記憶手段と、前記給湯管路から所定温度の湯が供給されるように前記加熱量調節手段により前記加熱手段の加熱量を制御し、追焚きと給湯とを同時に実行するときは前記第１熱量に基づいて前記加熱手段の加熱量を決定し、給湯のみを単独で実行するときには前記第２熱量に基づいて前記加熱手段の加熱量を決定する給湯制御手段とを備えた追焚き付き給湯器の改良に関する。
【００１６】
そして、前記給湯管の前記給湯熱交換器により水が加熱される箇所の下流側と前記追焚き管路とを連通して、前記給湯熱交換器により加熱生成された湯を、前記給湯管路から前記追焚き熱交換器により加熱される側の前記追焚き管路を経由して前記浴槽に供給する第１湯張り経路と、前記給湯管路から前記追焚き熱交換器により加熱されない側の前記追焚き管路を経由して前記浴槽に供給する第２湯張り経路とを形成し、前記給湯制御手段は、前記第１湯張り経路と前記第２湯張り経路とを介して前記給湯管路から前記浴槽に湯を供給するときには、前記第１熱量のデータに基づいて前記加熱手段の加熱量を決定することを特徴とする。
【００１７】
かかる本発明において、前記加熱量データ記憶手段には、給湯と追焚きとを同時に実行する場合に応じた前記第１熱量のデータと、給湯のみを単独で実行する場合に応じた前記第２熱量のデータとが記憶されている。そして、上述したように、前記給湯管路から前記第１湯張り経路と前記第２湯張り経路とを介して浴槽に湯を供給するという状況は、前記給湯熱交換器により前記給湯管路内を流れる水が加熱されると共に、前記追焚き熱交換器により前記追焚き管路内を流れる湯水が加熱されるという点で、給湯と追焚きとを同時に実行する状況と共通する。
【００１８】
そのため、前記給湯管路から前記第１湯張り経路と前記第２湯張り経路とを介して前記浴槽に湯を供給する場合に、前記第１熱量のデータに基づいて前記加熱手段の加熱量を決定することにより、前記給湯制御手段は、前記浴槽に供給される湯の温度を精度良く制御することができる。
【００１９】
【発明の実施の形態】
本発明の実施の形態の一例について、図１〜図２を参照して説明する。図１は本発明の追焚き付き給湯器の全体構成図、図２は図１に示した追焚き付き給湯器の制御ブロック図である。
【００２０】
図１を参照して、給湯器１は、給湯管路２により水道管（図示しない）と接続され、追焚き管路３により浴槽４と接続されている。そして、給湯器１は、水道管から給湯管路２により供給される水を所定温度に加熱して給湯する機能と、浴槽４に貯められた湯水を加熱して追焚きする機能と、浴槽４に所定温度の湯を所定量貯める湯張り機能とを有する。
【００２１】
給湯器１はコントローラ４により全体の作動が制御され、コントローラ４からの制御信号に応じて作動する第１バーナ５（本発明の加熱手段に相当する）及び該第１バーナよりも加熱能力が低い第２バーナ６（本発明の加熱手段に相当する）、第１バーナ５と第２バーナ６とにより加熱される追焚き熱交換器７と給湯熱交換器８、水道管から給湯管路２に供給された水の一部を給湯熱交換器８をバイパスさせて給湯熱交換器８から出湯される湯に混入させるバイパス管９、コントローラ４からの制御信号によりバイパス管９の開度を調節するバイパスサーボ１０、給湯管路２とバイパス管９との合流箇所Ｘの下流側の湯の温度を検出して検出信号をコントローラ４に出力する給湯サーミスタ１１、給湯熱交換器８の出口付近の湯の温度を検出して検出信号をコントローラ４に出力する熱交サーミスタ１２、水道から給湯管路２に供給される水の流量を検出して検出信号をコントローラ４に出力する給水流量センサ１３、及び給湯管路２から供給される湯の流量を調節する湯量サーボ１４を備える。
【００２２】
さらに、給湯器１は、給湯管路２と追焚き管路３とを接続する湯張り中継管３０、コントローラ４からの制御信号により作動して湯張り中継管３０を開閉する注湯電磁弁１５、追焚き管路３から湯張り中継管３０への方向の湯の通過を不能とし湯張り中継管３０から追焚き管路３への方向の湯の通過を可能とする逆止弁１６、コントローラ４からの制御信号により作動して浴槽４に貯められた湯水を追焚き管路３内に循環させるポンプ１７、浴槽４から追焚き管路３に供給される湯水の温度（＝浴槽に貯められた湯水の温度）を検出して検出信号をコントローラ４に出力する風呂サーミスタ１８、追焚き管路３内を流れる湯水の有無を検出して検出信号をコントローラ４に出力する風呂水流スイッチ１９、給湯管路２から湯張り中継管３０と追焚き管路３とを経由して浴槽４に供給される湯の流量を検出して検出信号をコントローラ４に出力する湯量センサ２０を備える。
【００２３】
また、給湯器１は、第１バーナ５と第２バーナ６の作動を制御するため、コントローラ４からの制御信号に応じて第１バーナ５と第２バーナ６への燃料ガスの供給と遮断とを切替える元ガス電磁弁２１、コントローラ４からの制御信号に応じて燃料ガスの供給流量を調節するガス比例弁２２、コントローラ４からの制御信号に応じて第１バーナ５への燃料ガスの供給と遮断とを切替える第１ガス電磁弁２３、コントローラ４からの制御信号に応じて第２バーナ６への燃料ガスの供給と遮断とを切替える第２ガス電磁弁２４、コントローラ４からの制御信号に応じて第１バーナ５と第２バーナ６に燃焼用空気を供給する燃焼ファン２５、コントローラ４からの制御信号に応じてイグナイタ２６から印加される高電圧により火花放電を生じる点火プラグ２７、第２バーナ６の燃焼炎の有無を検出して検出信号をコントローラ４に出力するフレームロッド２８、及び給湯熱交換器８内で最も給湯管路２内の温度が高くなる箇所の水の温度を検出して検出信号をコントローラ４に出力する水管サーミスタ２９を備える。
【００２４】
なお、第１ガス電磁弁２３と、第２ガス電磁弁２４と、ガス比例弁２２とにより、本発明の加熱量調節手段が構成される。また、水管サーミスタ２９は、追焚きのみを単独で実行したときに、給湯熱交換器８内に滞留した水が加熱されて異常に昇温されることを防止するために設けられ、水管サーミスタ２７の検出温度が所定の上限温度を超えたときに、コントローラ４は、第１バーナ５と第２バーナ６の燃焼を停止する。
【００２５】
また、コントローラ４は、浴室等に設置されたリモコン４０との間で各種信号の送受信を行う。リモコン４０には、給湯温度、湯張り温度、追焚き時間等を設定するスイッチ類（図示しない）と、給湯温度、湯張り温度等を表示するディスプレイ部（図示しない）とが備えられている。
【００２６】
次に、図２を参照して、コントローラ４は、給湯管路２から目標給湯温度の湯を供給する給湯運転を実行する給湯制御手段５０、浴槽４に貯められた湯を目標追焚き温度まで昇温させる追焚き運転を実行する追焚き制御手段５１、浴槽に目標湯張り温度の湯を目標湯張り量だけ供給する湯張り運転を実行する湯張り制御手段５２、第１バーナ５と第２バーナ６とによる総燃焼量（本発明の加熱手段が発生する熱量に相当する。以下、総バーナ燃焼量という）のうち、給湯熱交換器８側の加熱に使用される熱量の割合を算出する給湯熱量分配比把握手段５３、及び上記給湯運転と湯張り運転を行うために必要なデータが記憶されたデータメモリ５４（本発明の熱効率データ記憶手段の機能を含む）を備える。
【００２７】
給湯制御手段５０は、リモコン４０により設定された目標給湯温度の湯が給湯管路２から供給されるように、第１バーナ５と第２バーナ６の燃焼量を制御する。給湯制御手段５０は、給湯管路２の下流側に接続されたカラン（図示しない）が開けられて、水道管からの給水が開始されたことを水量センサ１３の検出信号から検知すると、燃焼ファン２５を作動させて燃焼用空気の供給を開始し、イグナイタ２６から点火プラグ２７に高電圧を印加して火花放電を生じさせた状態で、元ガス電磁弁２１と第２ガス電磁弁２３とを開弁して第２バーナ６に点火する。
【００２８】
そして、給湯制御手段５０は、第１ガス電磁弁２３と第２ガス電磁弁２４の双方を開弁して第１バーナ５と第２バーナ６とを燃焼させる「大燃焼」、第１ガス電磁弁２３を開弁して第２ガス電磁弁２４を閉弁し、第１バーナ５のみを燃焼させる「中燃焼」、第１電磁弁２３を閉弁して第２電磁弁２４を開弁し、第２バーナ６のみを燃焼させる「小燃焼」という３段階で、第１バーナ５と第２バーナ６とによる総バーナ燃焼量を調節する。また、給湯制御手段５０は、ガス比例弁２２の開度を変更することにより、「大燃焼」、「中燃焼」、「小燃焼」における燃焼量をさらに細かく制御する。
【００２９】
ここで、データメモリ５４には、以下の表１に示したように、「大燃焼」における最大燃焼量（Ｑ大_max）と最小燃焼量（Ｑ大min）、「中燃焼」における最大燃焼量（Ｑ中_max）と最小燃焼量（Ｑ中_min）、及び「小燃焼」における最大燃焼量（Ｑ小_max）と最小燃焼量（Ｑ小_min）のデータ（実験や計算により求められる）が記憶されている。
【００３０】
【表１】

【００３１】
しかし、総バーナ燃焼量（Ｑ_ALL）の全てが、給湯熱交換器８内を流れる水や、追焚き熱交換器７内を流れる湯水の加熱に使用されるわけではなく、無駄に消費される燃焼量もある。そこで、データメモリ５４には、以下の表２に示したように、「大燃焼（Ｑ大max，Ｑ大min）」、「中燃焼（Ｑ中max，Ｑ中min）」、「小燃焼（Ｑ小max，Ｑ小min）」における熱効率（η）のデータが記憶されている。
【００３２】
【表２】

【００３３】
ここで、熱効率（η）は以下の式（１）により定義される。また、給湯単独運転に対応した熱効率（η単大max〜η単小min）が本発明の第２熱効率のデータに相当し、給湯・追焚き同時運転に対応した熱効率（η同大max〜η同小min）が本発明の第１熱効率のデータに相当する。
【００３４】
【数１】

【００３５】
式（１）において、Ｔ_in1は水道管から給湯熱交換器８に供給される水の温度、Ｔ_out2は給湯熱交換器８から出湯される湯の温度、Ｗ2は給湯熱交換器８内を通過する水の流量である。一方、Ｔ_in2は浴槽４内に貯められた湯水の温度、Ｔ_out2は追焚き熱交換器から出湯される湯水の温度、Ｗ2は追焚き管路３内を通過する湯水の流量である。
【００３６】
熱効率（η）は、給湯運転のみを単独で実行するとき（以下、給湯単独運転という）よりも、給湯運転と追焚き運転を同時に実行するとき（以下、給湯・追焚き同時運転という）の方が若干高くなる。これは、給湯熱交換器８と追焚き熱交換器７における有効な総伝熱面積が、給湯・追焚き同時運転時の方が広くなるからである。
【００３７】
そのため、本実施の形態においては、上記表２に示したように給湯・追焚き同時運転に応じた熱効率（η同大max〜η同小min、本発明の第１熱効率に相当する）のデータと、給湯単独運転に応じた熱効率（η単大max〜η単小min、本発明の第２熱効率に相当する）のデータとが予めデータメモリ５４に記憶されている。そして、給湯制御手段５０は、運転状況（給湯単独運転又は給湯・追焚き同時運転）に応じた熱効率（η）を使用して、総バーナ燃焼量（Ｑ_ALL）を決定する。
【００３８】
給湯単独運転時には、総バーナ燃焼量（Ｑ_ALL）は給湯熱交換器８内を通過する水を加熱するためにのみ消費される。そして、給湯制御手段５０は、給湯サーミスタ１１の検出温度（Ｔ_H）と、水量センサ１３の検出流量（Ｆ_W）と、給湯熱交換器８において水の加熱に使用される熱量（Ｑ_R）とから、以下の式（２）により、水道管からの給水温度（Ｔ_W）を把握する。なお、熱量（Ｑ_R）は、総バーナ燃焼量（Ｑ_ALL）に熱効率（η）を掛けて算出される。
【００３９】
【数２】

【００４０】
そして、給湯制御手段５０は、給湯管路２から目標給湯温度（Ｔ_A）の湯を供給するために給湯熱交換器８に与える必要がある熱量（以下、必要給湯熱量（Ｑ_nh）という）を以下の式（３）により決定する。
【００４１】
【数３】

【００４２】
給湯単独運転時には、追焚き熱交換器７側では加熱を要しないため、給湯熱交換器８と追焚き熱交換器７とに与える必要がある総熱量（以下、総必要熱量（Ｑ_n）という）は、以下の式（４）に示すように必要給湯熱量（Ｑ_nh）と一致する。
【００４３】
【数４】

【００４４】
一方、給湯・追焚き同時運転時には、総バーナ燃焼量（Ｑ_ALL）の一部が、追焚き管路３内を循環する湯水を加熱するためにも消費される。そのため、給湯・追焚き同時運転時には、上記式（３）により算出される給湯必要熱量（Ｑ_nh）に、追焚き熱交換器７で消費される熱量（以下、追焚き消費熱量（Ｑ_c）という）を加えた熱量を給湯熱交換器８と追焚き熱交換器９に与える必要がある。
【００４５】
そこで、給湯制御手段５０は、給湯・追焚き同時運転時における総必要熱量（Ｑ_n）を、以下の式（５）により決定する。
【００４６】
【数５】

【００４７】
なお、追焚き消費熱量（Ｑ_c）は、風呂サーミスタ１８により検出される浴槽４に貯められた湯の温度と、ポンプ１７の能力により定まる追焚き管路３内を流れる湯水の流量とにより把握される。
【００４８】
そして、給湯制御手段５０は、このようにして式（４）又は式（５）により決定された総必要熱量（Ｑ_n）が得られるように、各運転状態（給湯単独運転又は給湯・追焚き同時運転）に応じて表２に示した熱効率（η）のデータを選択して、以下の式（６）により、総バーナ燃焼量（Ｑ_ALL）を決定する。これにより、給湯制御手段５０は、各運転状態に応じて総バーナ燃焼量（Ｑ_ALL）を精度良く決定することができる。
【００４９】
【数６】

【００５０】
そして、このようにして決定したバーナ総燃焼量（Ｑ_ALL）が発生するように、給湯制御手段５０は、上述した「大燃焼」，「中燃焼」，「小燃焼」のいずれかを選択し、また、ガス比例弁２２の開度を調節することによって、給湯管路２からの給湯温度が目標給湯温度に保たれるようにフィードフォワード制御を行う。
【００５１】
なお、このフィードフォワード制御により、基本的には給湯管路２からの給湯温度を目標給湯温度と一致させることができるはずであるが、給湯器１の固体差等を考慮して、最終的には給湯サーミスタ１１により検出される実際の給湯温度が目標給湯温度と一致するように、給湯制御手段５０は、フィードバック制御により総バーナ燃焼量（Ｑ_ALL）を補正する。
【００５２】
また、給湯単独運転時の「大燃焼」（「中燃焼」，「小燃焼」でも同様）における中間燃焼量Ｑ大ｘ（Ｑ大min＜Ｑ大ｘ＜Ｑ大max）に対する熱効率（η）は、以下の比例計算式（７）によって算出される。なお、給湯・追焚き同時運転時や湯張り運転時の中間燃焼量に対する熱効率（η）も、同様の比例計算によって算出される。
【００５３】
【数７】

【００５４】
次に、湯張り運転を行う場合、湯張り制御手段５２は、給湯制御手段５０に対してリモコン４０で設定された目標湯張り温度で給湯を行うことを指示して、注湯電磁弁１５を開弁する。
【００５５】
注湯電磁弁１５が開弁されると、図１を参照して、水道から給湯管路２への水の供給が開始され、給湯熱交換器８で加熱生成された湯が、給湯管路２から湯張り中継管３０を介して追焚き管路３に供給され、追焚き管路３の追焚き熱交換器７を通過する側の第１湯張り経路Ｒ１と、追焚き管路３の追焚き熱交換器７を通過しない側の第２湯張り経路Ｒ２とを経由して浴槽４に供給される。
【００５６】
ここで、給湯サーミスタ１１により検出される給湯管路２からの給湯温度が、目標湯張り温度となるように第１バーナ５と第２バーナ６の燃焼量をフィードバック制御すると、第１湯張り経路Ｒ１を経由して浴槽４に供給される湯は追焚き熱交換器７でさらに加熱されるため、浴槽４に貯められる湯の温度が目標湯張り温度よりも高くなってしまう。
【００５７】
そこで、給湯制御手段５０は、湯張り運転時にはフィードバック制御は行わず、フィードフォワード制御のみを行って給湯温度を制御する。そして、給湯制御手段５０は、上記式（６）により総バーナ燃焼量（Ｑ_ALL）を決定するときに、上記表２に示したように、給湯・追焚き同時運転に対応した熱効率（η同大max〜η同小min）を使用する。
【００５８】
ここで、湯張り運転時には、給湯熱交換器８により給湯管路２内を流れる水が加熱されると共に、第２湯張り経路Ｒ２においては追焚き熱交換器７により追焚き管路３内を流れる湯水が加熱されるという状況となる。そして、この状況は、給湯・追焚き同時運転時における、給湯熱交換器８により給湯管路２内を流れる水が加熱されると共に、追焚き熱交換器７によりポンプ１７で循環される浴槽４に貯まった湯水が加熱される状況と同様である。
【００５９】
そのため、湯張り運転時の熱効率（η）は、給湯・追焚き同時運転時の熱効率（η）と同様になると考えられる。そこで、給湯制御手段５０は、給湯・追焚き同時運転時に応じた熱効率（η）を使用して、湯張り運転時の第１バーナ５と第２バーナ２の燃焼量を制御することによって、浴槽４に供給される湯の温度が目標温度精度となるように精度良く制御することができる。
【００６０】
なお、本実施の形態では、上述した表１に示したように、各運転状況に応じた熱効率（η）をデータメモリ５４に記憶するようにしたが、以下の表３に示したように、総バーナ燃焼量のうち給湯熱交換器８による水の加熱と追焚き熱交換器７による湯水の加熱とに実際に使用される熱量のデータをデータメモリ５４（この場合は本発明の熱量データ記憶手段の機能を含む）に記憶し、該熱量データを使用して、第１バーナ５と第２バーナ６の燃焼量を決定するようにしてもよい。
【００６１】
【表３】

【００６２】
この場合には、上記式（４）または式（５）により決定した総必要熱量（Ｑ_n）に応じた総バーナ燃焼量（Ｑ_ALL）を表３から求める。例えば、給湯単独運転時に式（４）により決定された総必要熱量（Ｑ_n）がＱ単大minであったときには、対応する総バーナ燃焼量（Ｑ_ALL）として、Ｑ大minが選択される。なお、給湯単独運転に対応した熱量（Ｑ単大max〜Ｑ単小min）が本発明の第１熱量のデータに相当し、給湯・追焚き同時運転に対応した熱量（Ｑ同大max〜Ｑ小min）が本発明の第２熱量のデータに相当する。
【００６３】
また、給湯単独運転時の「大燃焼」（「中燃焼」，「小燃焼」でも同様）における中間熱量Ｑ単大ｘ（Ｑ単大min＜Ｑ単大ｘ＜Ｑ単大max）に対する総バーナ燃焼量（Ｑ_ALL）は、以下の比例計算式（８）によって算出される。なお、給湯・追焚き同時運転時や湯張り運転時の中間熱量に対する総バーナ燃焼量（Ｑ_ALL）も、同様の比例計算によって算出される。
【００６４】
【数８】

【００６５】
この場合には、例えば給湯器１の固体ごとに実際の熱量を測定して熱量データを設定することにより、より精度よく湯張り温度を制御することができる。
【００６６】
また、本実施の形態では、本発明の加熱手段としてガスを燃料とするバーナを示したが、灯油を燃料とするバーナを用いてもよく、また、電熱線により熱交換を行う構成としてもよい。
【図面の簡単な説明】
【図１】本発明の追焚き付き給湯器の全体構成図。
【図２】図１に示した追焚き付き給湯器の制御ブロック図。
【符号の説明】
１…追焚き付き給湯器、２…給湯管路、３…追焚き管路、４…浴槽、５…第１バーナ、６…第２バーナ、７…追焚き熱交換器、８…給湯熱交換器、９…バイパス管、１０…バイパスサーボ、１１…給湯サーミスタ、１２…熱交サーミスタ、１３…水量センサ、１４…湯量サーボ、１５…注湯電磁弁、１６…逆止弁、１７…ポンプ、１８…風呂サーミスタ、１９…風呂水流スイッチ、２０…湯量センサ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to hot water filling control in a so-called canned and two-water channel hot water heater with reheating, in which a part of a heat exchanger for hot water supply and a heat exchanger for reheating are overlapped.
[0002]
[Prior art]
In recent years, for the purpose of saving space, a so-called single-can two-water heater with a reheater in which a part of a heat exchanger for hot water supply and a heat exchanger for reheating is overlapped has been developed. In such a water heater, one end is connected to the water supply and the water supplied from the water supply is heated with a heat exchanger for hot water supply, and hot water is supplied from the other end. And a reheating pipe for circulating the hot water and water staying in the reheating heat exchanger while being heated by the reheating heat exchanger.
[0003]
When performing hot water supply, the heating amount of the hot water supply heat exchanger is determined so that the temperature of the hot water supplied from the hot water supply line becomes a predetermined target temperature, and feedforward control is performed. Further, a hot water supply temperature sensor for detecting the temperature of hot water supplied from the hot water supply pipe is provided, and the heating amount is further finely adjusted by feedback control so that the detected temperature of the hot water supply temperature sensor coincides with the target hot water supply temperature.
[0004]
In such a hot water heater with reheating, a hot water junction relay pipe is provided to connect the hot water supply pipe and the additional water heating pipe, and the hot water filling is carried out from the hot water supply pipe to the bathtub through the hot water filling relay pipe and the additional heating pipe. A water heater has been proposed.
[0005]
When hot water filling is performed using the additional heating pipe in this way, a first hot water filling path that reaches the bathtub via the side heated by the additional heat exchanger of the additional heating pipe, and the additional heating pipe It is common to supply hot water to the bathtub from the hot water supply pipe by so-called both transports through two paths called a second hot water filling path that reaches the bathtub through the side not heated by the reheating heat exchanger. .
[0006]
However, when hot water filling is performed by both transports, hot water of a target temperature supplied from the hot water supply pipe is supplied as it is to the bathtub on the second hot water supply path side, but on the first hot water supply path side, The hot water of the target temperature supplied from is further heated by a reheating heat exchanger and supplied to the bathtub.
[0007]
Therefore, when feedback control is performed so that the temperature of hot water supplied from the hot water supply line becomes the target temperature, as in normal hot water supply (other than hot water filling), the temperature of the hot water stored in the bathtub is the target. There is a disadvantage that it becomes higher than the temperature. Therefore, conventionally, when hot water filling is performed, feedback control is prohibited, the hot water supply temperature is controlled only by feedforward control, and the amount of heating by the hot water heat exchanger is reduced in anticipation of heating by the additional heat exchanger. It was like that.
[0008]
However, in this case, it is difficult to determine how much the heating amount is reduced, and it is difficult to accurately control the hot water temperature of the bathtub.
[0009]
[Problems to be solved by the invention]
The present invention has been made in view of the above-described background, and provides a water heater that can accurately control the temperature of a hot water bath to a bathtub by simple processing in a canned and double water heater with a reheater. The purpose is to do.
[0010]
[Means for Solving the Problems]
The present invention has been made in order to achieve the above-mentioned object, and has both ends connected to a bathtub and a reheating pipe for circulating and reheating hot water staying in the bathtub, and one end connected to a water supply. A hot water supply line for heating water supplied from the water supply and supplying hot water from the other end, a reheating heat exchanger for heating hot water flowing through the reheating line, and a part of the reheating heat exchanger And a hot water supply heat exchanger that heats the water flowing through the hot water supply pipe, heating means for heating the reheating heat exchanger and the hot water supply heat exchanger, and heating for adjusting the heating amount of the heating means The present invention relates to a water heater provided with a quantity adjusting means.
[0011]
First, according to the first aspect of the present invention, the heating by the hot water supply heat exchanger and the hot water by the additional heat exchanger out of the amount of heat generated by the heating means when simultaneously performing hot water supply and reheating. The first heat efficiency data, which is the ratio of the amount of heat actually used for heating, and the amount of heat generated by the heating means when performing only hot water supply alone, are actually used for heating water by the hot water supply heat exchanger. Heat efficiency data storage means storing second heat efficiency data, which is a ratio of the amount of heat used, and heating amount of the heating means by the heating amount adjustment means so that hot water of a predetermined temperature is supplied from the hot water supply pipe When the reheating and hot water supply are executed simultaneously, the heating amount of the heating means is determined based on the first thermal efficiency data, and when only the hot water supply is executed alone, the second thermal efficiency data is used. Said About reheating with water heater improvement and a hot water supply control means for determining a heating amount of the thermal unit.
[0012]
And the downstream side of the location where water is heated by the hot water supply heat exchanger of the hot water supply pipe and the reheating pipe line communicate with each other, and the hot water heated and generated by the hot water supply heat exchanger is connected to the hot water supply pipe line. A first hot water supply path to be supplied to the bathtub via the additional heating pipe on the side heated by the additional heat exchanger, and a side not heated by the additional heat exchanger from the hot water supply pipe A hot water communication pipe that forms a second hot water path that supplies the bathtub through the reheating pipe line, and the hot water supply control means includes the first hot water path and the second hot water path. When hot water is supplied from the hot water supply pipe to the bathtub through the first heat efficiency, the heating amount of the heating means is determined based on the first thermal efficiency.
[0013]
In the present invention, in the thermal efficiency storage means, the first thermal efficiency data according to the case where the hot water supply and the reheating are executed simultaneously, and the second thermal efficiency data according to the case where only the hot water supply is executed alone. Is stored. And the situation where hot water is supplied from the hot water supply pipe to the bathtub through the first hot water filling path and the second hot water filling path is that the water flowing in the hot water supply pipe is heated by the hot water heat exchanger. At the same time, the hot water flowing in the chasing pipe is heated by the chasing heat exchanger.
[0014]
Therefore, when supplying hot water to the bathtub from the hot water supply pipe via the first hot water filling path and the second hot water filling path, the heating amount of the heating means is determined based on the first thermal efficiency data. Thus, the hot water supply control means can accurately control the temperature of the hot water supplied to the bathtub. In this case, it is not necessary to perform a complicated process for correcting the heating amount of the heating means.
[0015]
Next, according to a second aspect of the present invention, when the hot water supply and the reheating are performed simultaneously, the heating means gives the water heated by the hot water heat exchanger and the hot water heated by the reheating heat exchanger. The first heat quantity data used in the above and the second heat quantity data given by the heating means and used for heating the water by the hot water supply heat exchanger when only hot water supply is executed are stored. When the heating amount of the heating means is controlled by the heating amount adjusting means so that hot water of a predetermined temperature is supplied from the heat quantity data storage means and the hot water supply pipe, Hot water supply with reheating provided with hot water control means for determining the heating amount of the heating means based on one heat amount and determining the heating amount of the heating means based on the second heat amount when performing only hot water supply alone On improvement of vessel
[0016]
And the downstream side of the location where water is heated by the hot water supply heat exchanger of the hot water supply pipe and the reheating pipe line communicate with each other, and the hot water heated and generated by the hot water supply heat exchanger is connected to the hot water supply pipe line. A first hot water supply path to be supplied to the bathtub via the additional heating pipe on the side heated by the additional heat exchanger, and a side not heated by the additional heat exchanger from the hot water supply pipe A second hot water supply path to be supplied to the bathtub via the reheating pipe line, and the hot water supply control means is configured to supply the hot water supply pipe via the first hot water supply path and the second hot water supply path. When hot water is supplied from the road to the bathtub, the heating amount of the heating means is determined based on the data of the first heat amount.
[0017]
In the present invention, the heating amount data storage means includes the first heat amount data corresponding to the case where hot water supply and reheating are performed simultaneously, and the second heat amount corresponding to the case where only hot water supply is executed alone. Are stored. As described above, the situation in which hot water is supplied from the hot water supply pipe to the bathtub through the first hot water filling path and the second hot water filling path is determined by the hot water heat exchanger in the hot water supply pipe. This is common with the situation where hot water supply and reheating are performed simultaneously in that the water flowing through the reheating heat exchanger is heated and the hot water flowing through the reheating pipeline is heated by the reheating heat exchanger.
[0018]
Therefore, when hot water is supplied from the hot water supply pipe to the bathtub via the first hot water filling path and the second hot water filling path, the heating amount of the heating means is determined based on the first heat quantity data. By determining, the hot water supply control means can accurately control the temperature of hot water supplied to the bathtub.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
An example of an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is an overall configuration diagram of a hot water heater with a reheating apparatus according to the present invention, and FIG. 2 is a control block diagram of the hot water supply apparatus with a reheating apparatus shown in FIG.
[0020]
Referring to FIG. 1, a water heater 1 is connected to a water pipe (not shown) by a hot water supply pipe 2 and is connected to a bathtub 4 by a reheating pipe 3. The water heater 1 has a function of heating water supplied from the water pipe through the hot water supply pipe 2 to a predetermined temperature to supply hot water, a function of heating and chasing the hot water stored in the bathtub 4, and the bathtub 4 Has a hot water filling function for storing a predetermined amount of hot water at a predetermined temperature.
[0021]
The entire operation of the water heater 1 is controlled by the controller 4, and the first burner 5 (corresponding to the heating means of the present invention) that operates according to the control signal from the controller 4 and the heating capability is lower than that of the first burner. The second burner 6 (corresponding to the heating means of the present invention), the reheating heat exchanger 7 and the hot water supply heat exchanger 8 heated by the first burner 5 and the second burner 6, and the water pipe to the hot water supply line 2 A bypass pipe 9 for bypassing the hot water supply heat exchanger 8 to mix a part of the supplied water with hot water discharged from the hot water supply heat exchanger 8, and the opening degree of the bypass pipe 9 is adjusted by a control signal from the controller 4. Bypass servo 10, hot water thermistor 11 that detects the temperature of hot water downstream of the junction X between the hot water supply pipe 2 and the bypass pipe 9 and outputs a detection signal to the controller 4, hot water near the outlet of the hot water heat exchanger 8 Detect temperature From the heat exchanger thermistor 12 that outputs a detection signal to the controller 4, the water supply flow rate sensor 13 that detects the flow rate of water supplied from the water supply to the hot water supply pipe 2 and outputs the detection signal to the controller 4, and the hot water supply pipe 2 A hot water servo 14 for adjusting the flow rate of hot water supplied is provided.
[0022]
Further, the water heater 1 includes a hot water relay pipe 30 that connects the hot water supply pipe 2 and the follow-up pipe 3, and a hot water solenoid valve 15 that operates by a control signal from the controller 4 to open and close the hot water relay pipe 30. A check valve 16 that allows passage of hot water in the direction from the hot water relay pipe 30 to the hot water relay pipe 30 and disables passage of hot water in the direction from the hot water relay pipe 30 to the hot water pipe 3, controller 4 is operated by a control signal from the pump 4 to circulate hot water stored in the bathtub 4 in the tracking pipe 3, and the temperature of hot water supplied from the bathtub 4 to the tracking pipe 3 (= stored in the bathtub). A bath thermistor 18 that detects the temperature of the hot water and outputs a detection signal to the controller 4, a bath water flow switch 19 that detects the presence or absence of hot water flowing in the tracking pipe 3 and outputs a detection signal to the controller 4, and hot water supply From pipe 2 to hot water filled relay pipe 30 Comprising a hot water sensor 20 that outputs a detection signal by detecting the flow rate of the hot water supplied to the bathtub 4 via the fired line 3 to the controller 4.
[0023]
In addition, the water heater 1 controls the operation of the first burner 5 and the second burner 6, so that the fuel gas is supplied to and shut off from the first burner 5 and the second burner 6 in accordance with a control signal from the controller 4. A gas proportional valve 22 that adjusts the supply flow rate of the fuel gas in accordance with a control signal from the controller 4, a fuel gas supply to the first burner 5 in accordance with a control signal from the controller 4 The first gas solenoid valve 23 that switches between shutoff and the control signal from the controller 4, the second gas solenoid valve 24 that switches between supply and shutoff of the fuel gas to the second burner 6 according to the control signal from the controller 4 Combustion fan 25 for supplying combustion air to the first burner 5 and the second burner 6, and ignition for generating a spark discharge by a high voltage applied from the igniter 26 according to a control signal from the controller 4 The lug 27, the frame rod 28 that detects the presence or absence of a combustion flame in the second burner 6 and outputs a detection signal to the controller 4, and the water at the highest temperature in the hot water supply pipe 2 in the hot water supply heat exchanger 8. And a water pipe thermistor 29 that outputs a detection signal to the controller 4.
[0024]
The first gas solenoid valve 23, the second gas solenoid valve 24, and the gas proportional valve 22 constitute the heating amount adjusting means of the present invention. Further, the water pipe thermistor 29 is provided to prevent the water staying in the hot water supply heat exchanger 8 from being heated and abnormally heated when only the reheating is performed alone. When the detected temperature exceeds a predetermined upper limit temperature, the controller 4 stops the combustion of the first burner 5 and the second burner 6.
[0025]
The controller 4 transmits and receives various signals to and from the remote controller 40 installed in a bathroom or the like. The remote controller 40 includes switches (not shown) for setting a hot water supply temperature, a hot water filling temperature, a chasing time, and the like, and a display unit (not shown) for displaying the hot water supply temperature, the hot water filling temperature, and the like.
[0026]
Next, referring to FIG. 2, the controller 4 performs hot water supply control means 50 for performing hot water supply operation for supplying hot water at the target hot water supply temperature from the hot water supply pipe 2, and supplies hot water stored in the bathtub 4 to the target reheating temperature. Reheating control means 51 for performing reheating operation for raising the temperature, hot water control means 52 for performing hot water filling operation for supplying the hot water at the target hot water temperature to the bathtub by the target hot water amount, the first burner 5 and the second Of the total amount of combustion by the burner 6 (corresponding to the amount of heat generated by the heating means of the present invention; hereinafter referred to as the total amount of burner combustion), the ratio of the amount of heat used for heating on the hot water supply heat exchanger 8 side is calculated. A hot water supply heat quantity distribution ratio grasping means 53 and a data memory 54 (including the function of the thermal efficiency data storage means of the present invention) in which data necessary for performing the hot water supply operation and the hot water filling operation are provided.
[0027]
The hot water supply control means 50 controls the combustion amount of the first burner 5 and the second burner 6 so that hot water at the target hot water supply temperature set by the remote controller 40 is supplied from the hot water supply pipe 2. When the hot water supply control means 50 detects from the detection signal of the water amount sensor 13 that a curan (not shown) connected to the downstream side of the hot water supply pipe 2 is opened and water supply from the water pipe is started, the combustion fan 25, the supply of combustion air is started, and a high voltage is applied from the igniter 26 to the spark plug 27 to cause a spark discharge, and the original gas solenoid valve 21 and the second gas solenoid valve 23 are The valve is opened and the second burner 6 is ignited.
[0028]
Then, the hot water supply control means 50 opens both the first gas solenoid valve 23 and the second gas solenoid valve 24 so as to burn the first burner 5 and the second burner 6, and the first gas solenoid. The valve 23 is opened and the second gas solenoid valve 24 is closed, “medium combustion” in which only the first burner 5 is burned, the first solenoid valve 23 is closed and the second solenoid valve 24 is opened. The total burner combustion amount by the first burner 5 and the second burner 6 is adjusted in three stages of “small combustion” in which only the second burner 6 is burned. Further, the hot water supply control means 50 controls the amount of combustion in “large combustion”, “medium combustion”, and “small combustion” more finely by changing the opening of the gas proportional valve 22.
[0029]
Here, in the data memory 54, as shown in Table 1 below, the maximum combustion amount in the “large combustion” (Q large _max ), Minimum combustion amount (Q large min), maximum combustion amount in “medium combustion” (in Q _max ) And minimum combustion amount (in Q) _min ), And the maximum amount of combustion in “small combustion” (small Q) _max ) And minimum combustion amount (small Q) _min ) Data (obtained by experiments and calculations).
[0030]
[Table 1]

[0031]
However, the total burner combustion amount (Q _ALL ) Are not used for heating the water flowing in the hot water supply heat exchanger 8 or the hot water flowing in the reheating heat exchanger 7, and there is a combustion amount consumed wastefully. Therefore, in the data memory 54, as shown in Table 2 below, “large combustion (Q large max, Q large min)”, “medium combustion (Q medium max, Q medium min)”, “small combustion ( Data of thermal efficiency (η) at “Q small max, Q small min)” is stored.
[0032]
[Table 2]

[0033]
Here, the thermal efficiency (η) is defined by the following equation (1). Further, the thermal efficiency corresponding to the hot water supply single operation (η single maximum to η single small min) corresponds to the second thermal efficiency data of the present invention, and the thermal efficiency corresponding to the hot water supply and reheating simultaneous operation (η same maximum max to η The same small min) corresponds to the first thermal efficiency data of the present invention.
[0034]
[Expression 1]

[0035]
In equation (1), T _in 1 is the temperature of water supplied from the water pipe to the hot water supply heat exchanger 8, T _out 2 is the temperature of hot water discharged from the hot water supply heat exchanger 8, and W 2 is the flow rate of water passing through the hot water supply heat exchanger 8. On the other hand, T _in 2 is the temperature of hot water stored in the bathtub 4, T _out 2 is the temperature of hot water discharged from the reheating heat exchanger, and W2 is the flow rate of hot water passing through the reheating conduit 3.
[0036]
Thermal efficiency (η) is greater when performing hot water supply operation and reheating operation simultaneously (hereinafter referred to as simultaneous hot water supply and reheating operation) than when performing only hot water supply operation (hereinafter referred to as single operation of hot water supply). Is slightly higher. This is because the effective total heat transfer area in the hot water supply heat exchanger 8 and the reheating heat exchanger 7 is larger during the simultaneous operation of hot water supply and reheating.
[0037]
Therefore, in the present embodiment, as shown in Table 2 above, the data of the thermal efficiency (η same magnitude max to η same min min, corresponding to the first thermal efficiency of the present invention) according to the simultaneous hot water supply and reheating operation And data of thermal efficiency (η single maximum max to η single small min, corresponding to the second thermal efficiency of the present invention) according to the hot water supply single operation are stored in the data memory 54 in advance. Then, the hot water supply control means 50 uses the thermal efficiency (η) according to the operation state (hot water supply single operation or hot water supply / reheating simultaneous operation) to calculate the total burner combustion amount (Q _ALL ).
[0038]
During hot water supply single operation, the total burner combustion amount (Q _ALL ) Is consumed only to heat the water passing through the hot water supply heat exchanger 8. The hot water supply control means 50 detects the temperature detected by the hot water supply thermistor 11 (T _H ) And the detected flow rate (F _W ) And the amount of heat used to heat water in the hot water supply heat exchanger 8 (Q _R ) And the water supply temperature (T _W ). The amount of heat (Q _R ) Is the total burner combustion amount (Q _ALL ) Multiplied by thermal efficiency (η).
[0039]
[Expression 2]

[0040]
Then, the hot water supply control means 50 is connected to the target hot water supply temperature (T _A The amount of heat that needs to be given to the hot water supply heat exchanger 8 to supply hot water (hereinafter referred to as the required amount of hot water supply (Q _nh )) Is determined by the following equation (3).
[0041]
[Equation 3]

[0042]
During the hot water supply single operation, since the heating heat exchanger 7 does not require heating, the total heat amount (hereinafter referred to as the total required heat amount (Q) required to be given to the hot water supply heat exchanger 8 and the additional heat exchanger 7 is required. _n )) Is the required amount of hot water supply (Q _nh ).
[0043]
[Expression 4]

[0044]
On the other hand, the total burner combustion amount (Q _ALL ) Is also consumed to heat the hot and cold water circulating in the tracking pipe 3. For this reason, during simultaneous hot water supply and reheating operation, the required amount of heat for hot water supply (Q _nh ) And the amount of heat consumed by the additional heat exchanger 7 (hereinafter referred to as additional heat consumption (Q _c It is necessary to provide the hot water supply heat exchanger 8 and the reheating heat exchanger 9 with the amount of heat added).
[0045]
Therefore, the hot water supply control means 50 determines the total required heat amount (Q _n ) Is determined by the following equation (5).
[0046]
[Equation 5]

[0047]
In addition, additional heat consumption (Q _c ) Is grasped by the temperature of the hot water stored in the bathtub 4 detected by the bath thermistor 18 and the flow rate of the hot water flowing in the chasing pipe 3 determined by the capacity of the pump 17.
[0048]
And the hot water supply control means 50 is the total required heat quantity (Q) determined by Formula (4) or Formula (5) in this way. _n ) To obtain the thermal efficiency (η) data shown in Table 2 according to each operation state (hot water supply single operation or hot water supply and reheating simultaneous operation), and the following equation (6) Burner combustion amount (Q _ALL ). As a result, the hot water supply control means 50 determines the total burner combustion amount (Q _ALL ) Can be determined with high accuracy.
[0049]
[Formula 6]

[0050]
The burner total combustion amount (Q _ALL ) Is generated, the hot water supply control means 50 selects any one of the above-mentioned “large combustion”, “medium combustion”, and “small combustion”, and adjusts the opening of the gas proportional valve 22. The feedforward control is performed so that the hot water supply temperature from the hot water supply pipe line 2 is maintained at the target hot water supply temperature.
[0051]
It should be noted that this feedforward control should be able to basically match the hot water supply temperature from the hot water supply pipe line 2 with the target hot water supply temperature. The hot water supply control means 50 controls the total burner combustion amount (Q by feedback control so that the actual hot water supply temperature detected by the hot water supply thermistor 11 matches the target hot water supply temperature. _ALL ) Is corrected.
[0052]
Further, the thermal efficiency (η) with respect to the intermediate combustion amount Q large x (Q large min <Q large x <Q large max) in “large combustion” (the same applies to “medium combustion” and “small combustion”) at the time of hot water supply single operation The following proportional calculation formula (7) is used. The thermal efficiency (η) with respect to the intermediate combustion amount at the time of simultaneous hot water supply and reheating operation or hot water filling operation is also calculated by the same proportional calculation.
[0053]
[Expression 7]

[0054]
Next, when performing the hot water filling operation, the hot water filling control means 52 instructs the hot water supply control means 50 to supply hot water at the target hot water filling temperature set by the remote controller 40, and the hot water solenoid valve 15 is turned on. Open the valve.
[0055]
When the hot water solenoid valve 15 is opened, referring to FIG. 1, the supply of water from the water supply to the hot water supply pipe 2 is started, and the hot water generated by the hot water supply heat exchanger 8 is supplied to the hot water supply pipe. 2 through the hot water junction relay pipe 30 and the first hot water path R1 on the side of the additional water pipe 3 passing through the additional heat exchanger 7 and the additional water pipe 3 It is supplied to the bathtub 4 via the second hot water filling path R2 on the side that does not pass through the reheating heat exchanger 7.
[0056]
Here, when the amount of combustion in the first burner 5 and the second burner 6 is feedback-controlled so that the hot water supply temperature from the hot water supply pipe 2 detected by the hot water supply thermistor 11 becomes the target hot water filling temperature, the first hot water filling route. Since the hot water supplied to the bathtub 4 via R1 is further heated by the reheating heat exchanger 7, the temperature of the hot water stored in the bathtub 4 becomes higher than the target hot water temperature.
[0057]
Therefore, the hot water supply control means 50 does not perform feedback control during the hot water filling operation, but performs only feedforward control to control the hot water supply temperature. The hot water supply control means 50 then calculates the total burner combustion amount (Q _ALL ) Is used, as shown in Table 2 above, the thermal efficiency (η same magnitude max to η same min) corresponding to simultaneous hot water supply and reheating operation is used.
[0058]
Here, at the time of hot water filling operation, water flowing in the hot water supply pipe line 2 is heated by the hot water supply heat exchanger 8, and in the second hot water filling path R2, the inside of the hot water pipe line 3 is moved by the additional heat exchanger 7. The flowing hot water is heated. In this situation, the water 4 flowing in the hot water supply pipe 2 is heated by the hot water supply heat exchanger 8 and the bathtub 4 circulated by the pump 17 by the additional heat exchanger 7 during simultaneous hot water supply and reheating operation. This is the same as the situation where the hot water stored in is heated.
[0059]
Therefore, it is considered that the thermal efficiency (η) at the time of hot water filling operation is the same as the thermal efficiency (η) at the time of hot water supply and reheating simultaneous operation. Therefore, the hot water supply control means 50 uses the thermal efficiency (η) according to the simultaneous hot water supply and reheating operation to control the combustion amount of the first burner 5 and the second burner 2 during the hot water filling operation, thereby 4 can be accurately controlled so that the temperature of the hot water supplied to the target temperature becomes the target temperature accuracy.
[0060]
In the present embodiment, as shown in Table 1 described above, the thermal efficiency (η) corresponding to each operation situation is stored in the data memory 54, but as shown in Table 3 below, Of the total burner combustion amount, data on the amount of heat actually used for heating the water by the hot water supply heat exchanger 8 and heating the hot water by the reheating heat exchanger 7 is stored in the data memory 54 (in this case, the heat amount data storage of the present invention). And the amount of combustion of the first burner 5 and the second burner 6 may be determined using the heat quantity data.
[0061]
[Table 3]

[0062]
In this case, the total required heat quantity (Q determined by the above formula (4) or formula (5)) _n ) Total burner combustion amount (Q _ALL ) Is obtained from Table 3. For example, the total required heat amount (Q _n ) Is Q single min, the corresponding total burner combustion amount (Q _ALL ), Q large min is selected. The amount of heat corresponding to the hot water supply single operation (Q single maximum to Q single small min) corresponds to the first heat amount data of the present invention, and the heat amount corresponding to the simultaneous hot water supply and reheating operation (Q same maximum max to Q Small min) corresponds to the second calorific value data of the present invention.
[0063]
Also, the total burner for intermediate heat quantity Q single x (Q single large min <Q single large x <Q single maximum) in “large combustion” (same for “medium combustion” and “small combustion”) during hot water supply single operation Combustion amount (Q _ALL ) Is calculated by the following proportional calculation formula (8). It should be noted that the total burner combustion amount (Q _ALL ) Is also calculated by the same proportional calculation.
[0064]
[Equation 8]

[0065]
In this case, for example, by measuring the actual amount of heat for each solid in the water heater 1 and setting the amount of heat data, the filling temperature can be controlled with higher accuracy.
[0066]
In the present embodiment, the burner using gas as fuel is shown as the heating means of the present invention. However, a burner using kerosene as fuel may be used, and heat may be exchanged by a heating wire. .
[Brief description of the drawings]
FIG. 1 is an overall configuration diagram of a hot water heater with a reheating device according to the present invention.
FIG. 2 is a control block diagram of the hot water heater with reheating shown in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Hot water heater with reheating, 2 ... Hot water supply pipe line, 3 ... Reheating water pipe line, 4 ... Bathtub, 5 ... 1st burner, 6 ... 2nd burner, 7 ... Reheating heat exchanger, 8 ... Hot water supply heat exchange 9 ... Bypass pipe, 10 ... Bypass servo, 11 ... Hot water thermistor, 12 ... Heat exchange thermistor, 13 ... Water quantity sensor, 14 ... Hot water quantity servo, 15 ... Hot water solenoid valve, 16 ... Check valve, 17 ... Pump, 18 ... Bath thermistor, 19 ... Bath water flow switch, 20 ... Hot water sensor

Claims

Both ends are connected to the bathtub and the hot water staying in the bathtub is circulated and chased, and one end is connected to the water and the water supplied from the water is heated to supply hot water from the other end Hot water supply line, a reheating heat exchanger that heats the hot water flowing through the reheating pipe, and a hot water supply heat that partially heats the water flowing through the renewing heat exchanger When simultaneously performing the heating device for heating the exchanger, the reheating heat exchanger and the hot water supply heat exchanger, the heating amount adjusting device for adjusting the heating amount of the heating device, and the hot water supply and reheating Of the amount of heat generated by the heating means, data on the first thermal efficiency, which is a ratio of the amount of heat actually used for heating water by the hot water supply heat exchanger and heating hot water by the reheating heat exchanger, and only hot water supply The hot water supply out of the amount of heat generated by the heating means when executing alone Heat efficiency data storage means storing second heat efficiency data, which is a ratio of the amount of heat actually used for water heating by the exchanger, and the heating amount so that hot water of a predetermined temperature is supplied from the hot water supply pipe When the heating means of the heating means is controlled by the adjusting means and the reheating and the hot water supply are executed simultaneously, the heating amount of the heating means is determined based on the data of the first thermal efficiency, and only the hot water supply is executed alone. Sometimes, in the hot water heater with reheating provided with the hot water supply control means for determining the heating amount of the heating means based on the data of the second thermal efficiency, the location where water is heated by the hot water heat exchanger of the hot water pipe The downstream side and the reheating pipe line communicate with each other, and the hot water generated by the hot water supply heat exchanger is connected to the reheating line on the side heated by the reheating heat exchanger from the hot water supply line. Via the bath Forming a first hot water supply path to be supplied to the bathtub and a second hot water supply path to be supplied to the bathtub through the additional heat pipe not heated by the additional heat exchanger from the hot water supply line, The hot water supply control means, when supplying hot water from the hot water supply pipe line to the bathtub via the first hot water filling path and the second hot water filling path, based on the data of the first thermal efficiency, A water heater with reheating, which determines the amount of heating.

Both ends are connected to the bathtub and the hot water staying in the bathtub is circulated and chased, and one end is connected to the water and the water supplied from the water is heated to supply hot water from the other end Hot water supply line, a reheating heat exchanger that heats the hot water flowing through the reheating pipe, and a hot water supply heat that partially heats the water flowing through the renewing heat exchanger When simultaneously performing the heating device for heating the exchanger, the reheating heat exchanger and the hot water supply heat exchanger, the heating amount adjusting device for adjusting the heating amount of the heating device, and the hot water supply and reheating Data of the first heat amount given by the heating means and used for heating the water by the hot water supply heat exchanger and heating the hot water by the reheating heat exchanger, and the heating when performing only hot water supply alone Used for heating water by the hot water heat exchanger given by the means Heat amount data storage means storing the second heat quantity data, and the heating amount adjustment means controls the heating amount of the heating means so that hot water of a predetermined temperature is supplied from the hot water supply pipe line. Is performed based on the first heat amount data, and the heating amount of the heating means is determined based on the second heat amount data when only the hot water supply is performed alone. In the hot water heater with reheating provided with the hot water supply control means for determining, the downstream side of the portion where water is heated by the hot water heat exchanger of the hot water supply pipe and the reheating pipe line communicate with each other, and the hot water heat A first hot water supply path for supplying hot water heated and generated by the exchanger to the bathtub via the reheating pipe on the side heated by the reheating heat exchanger from the hot water supply line, and the hot water supply Exhaust heat exchange from the pipeline Forming a second hot water supply path to be supplied to the bathtub via the reheating pipe line on the side not heated by the hot water supply control means, and the hot water supply control means includes the first hot water supply path and the second hot water supply path. when supplying hot water to the bathtub from the hot water supply conduit via the reheating with water heater and determines the heating amount of said heating means based on the data of the first heat.