JP3652599B2 - Water heater with remembrance - Google Patents

Description

【００３３】
そのため、給湯制御手段５０は、表１のデータとガス比例弁２２の開度とから、「大燃焼」、「中燃焼」、「小燃焼」における第１バーナ５と第２バーナ６とによる総バーナ加熱量（Ｑ_ALL）を把握することができる。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実際に使用される熱量（Ｑ_R）とから、以下の式（１）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、総バーナ加熱量（Ｑ_ALL）に追焚き熱交換器７と給湯熱交換器８とのトータルの熱効率（η）を掛けて算出される。
【００３４】
このトータルの熱効率（η）は、総バーナ加熱量（Ｑ_ALL）の各状態（Ｑ大_max〜Ｑ小_min）ごとに設定されて、データメモリ５４に記憶されている。
【００３５】
【数１】

【００３６】
そして、給湯制御手段５０は、給湯管路２とバイパス管９との合流箇所Ｘの下流側に供給される湯の温度を目標給湯温度（Ｔ_A）とするのに必要な総バーナ加熱量（Ｑ_ALL）を以下の式（２）により算出する。
【００３７】
【数２】

【００３８】
そして、給湯制御手段５０は、上記式（２）により算出した総バーナ加熱量（Ｑ_ALL）が得られるように、ガス比例弁２２の開度、燃焼ファン２５の回転速度、及び第１ガス電磁弁２３と第２ガス電磁弁２４の開閉を制御する。
【００３９】
このようにして、総バーナ加熱量（Ｑ_ALL）を制御することにより、基本的には給湯管路２から目標給湯温度（Ｔ_A）の湯が供給されるが、給湯サーミスタ１１の検出温度（Ｔ_H）が目標給湯温度（Ｔ_A）と一致しない場合は、給湯制御手段５０は、更に総バーナ加熱量（Ｑ_ALL）の微調整を行う。また、湯量サーボ１４により、給湯器１の最大能力を超えないように給湯管路２への給水量の微調整を行う。
【００４０】
そして、給湯制御手段５０は、使用者によりカランが閉められて、水道管から給湯管路２への給水が停止したことを水量センサ１３の検出信号から検知したときに、元ガス電磁弁２１と第１ガス電磁弁２３と第２ガス電磁弁２４とを閉弁し、燃焼ファン２５の作動を停止して給湯制御を終了する。
【００４１】
次に、追焚き制御手段５１は、リモコン４０による追焚きの開始指示に応じて、追焚き制御を開始する。追焚き制御手段５１は、ポンプ１７を作動させて浴槽４内の湯水を追焚き管路３に循環させ、この状態で、第１バーナ５により追焚き熱交換器７を加熱して、追焚き管路３内を循環する湯水を加熱する。これにより、浴槽４内に貯められた湯水が次第に昇温され、風呂サーミスタ１８の検出温度がリモコン４０により設定された目標追焚き温度となったときに、追焚き制御手段５１は、第１バーナ５の燃焼を停止して追焚き制御を終了する。
【００４２】
なお、追焚き制御手段５１は、ポンプ１７を作動させたときに、風呂水流スイッチ１９により水流が検出されるか否かを確認する。そして、風呂水流スイッチ１９により水流が検出され、浴槽４に湯水が貯められていると判断できるときに追焚き制御を実行する。
【００４３】
また、湯張り制御手段５２は、リモコン４０による湯張りの開始指示に応じて湯張り制御を開始する。湯張り制御手段５２は、先ず注湯電磁弁１５を開弁し、これにより、水道管から湯張り管路２への給水が開始され、給湯制御手段５０により、リモコン４０により設定された目標湯張り温度での給湯制御が開始される。そして、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、目標湯張り温度の湯が浴槽４に供給される。
【００４４】
湯張り制御手段５２は、湯量センサ２０により検出される湯の供給流量と湯の供給時間とから、浴槽４に貯められた湯量を把握し、湯量がリモコン４０により設定された目標湯張り量に達したときに、注湯電磁弁１５を閉弁して湯張り制御を終了する。
【００４５】
次に、上述したように、給湯制御を単独で行う場合には、第１バーナ５と第２バーナ６とによる総バーナ加熱量（Ｑ_ALL）のほとんどが、給湯熱交換器８内を通過する水を加熱するために使用される。そのため、上記式（２）により、目標給湯温度（Ｔ_A）の湯を供給するために必要な総バーナ加熱量（Ｑ_ALL）を求めることができる。
【００４６】
しかし、給湯制御と追焚き制御とを同時に行う場合には、第１バーナ５と第２バーナ６とによる総バーナ加熱量（Ｑ_ALL）が、給湯熱交換器８内を通過する水を加熱するために使用されると共に、追焚き熱交換器７内を通過する湯水を加熱するためにも使用される。
【００４７】
そのため、給湯制御と追焚き制御とを同時に行う場合には、総バーナ加熱量（Ｑ_ALL）のうちで、給湯熱交換器８側に分配される熱量を把握して、給湯制御を行う必要がある。
【００４８】
そこで、コントローラ１に備えられた給湯熱量分配比把握手段５３は、総バーナ加熱量（Ｑ_ALL）に対する給湯熱交換器８の加熱に使用される熱量の割合である給湯熱量分配比（Ｋq）を算出し、給湯制御手段５０は、該給湯熱量分配比（Ｋq）に基づいて目標給湯温度（Ｔ_A）での給湯に必要となる総バーナ加熱量（Ｑ_ALL）を決定する。以下、給湯熱量分配比把握手段５３による給湯熱量分配比（Ｋq）の算出手順について説明する。
【００４９】
本願発明者らは、給湯熱量分配比を算出する方法について各種検討した結果、追焚き管路３から追焚き熱交換器７に供給される湯水の温度と、給湯熱交換器８から給湯管路２に供給される湯の温度との差である第１差分温度（ΔＴ₁）と、給湯熱量分配比（Ｋq）とが比例することを知見した。
【００５０】
これは、追焚き熱交換器７に供給される湯水の温度（＝浴槽４に貯められた湯水の温度）が低いほど、追焚き熱交換器７側で使用される熱量が増加し、また、水道管から供給される水の温度はほぼ一定とみなされるので、給湯熱交換器８から供給される湯の温度が高いほど給湯熱交換器８側で使用される熱量が増加するため、両者の差が給湯熱量分配比（Ｋq）に比例するものと考えられる。
【００５１】
図３は、上述した「大燃焼」における最大加熱量（Ｑ大_max）と最小加熱量（Ｑ大min）、「中燃焼」における最大加熱量（Ｑ中_max）と最小加熱量（Ｑ中_min）、及び「小燃焼」における最大加熱量（Ｑ小_max）と最小加熱量（Ｑ小_min）に対する、給湯熱量分配比（Ｋq）と第１差分温度（ΔＴ₁）との相関関係を示したグラフである。図中、▲１▼がＱ大_max、▲２▼がＱ大min、▲３▼がＱ中_max、▲４▼がＱ中_min、▲５▼がＱ小_max、▲６▼がＱ小_minにそれぞれ対応している。
【００５２】
給湯熱量分配比把握手段５３は、風呂サーミスタ１８により検出される追焚き管路３から追焚き熱交換器７に供給される湯水の温度と、熱交サーミスタ１２により検出される給湯熱交換器８から給湯管路２に供給される湯の温度との差である第２差分温度（ΔＴ₂）を、図３に示したグラフの第１差分温度（ΔＴ₁）として該グラフに適用し、追焚き制御と給湯制御とが同時に実行されているときの該第２差分温度（ΔＴ₂）に応じた給湯熱量分配比（Ｋq）を算出する。
【００５３】
そして、給湯制御手段５０は、給湯熱量分配比把握手段５３により算出された給湯熱量分配比（Ｋq）を使用して、目標温度（Ｔ_A）とするのに必要な総バーナ加熱量（Ｑ_ALL’）を以下の式（３）により算出し、該総バーナ加熱量（Ｑ_ALL’）が得られるように、第１バーナ５と第２バーナ６の燃焼量を制御する。
【００５４】
【数３】

【００５５】
ここで、Ｑ_ALLは上記式（２）より算出される総バーナ加熱量である。
【００５６】
このようにして、給湯熱量分配比（Ｋq）を使用して総バーナ加熱量（Ｑ_ALL）を制御することにより、給湯制御手段５０は、追焚き制御と給湯制御とを同時に実行する場合であっても、精度良く給湯温度を制御することができる。
【００５７】
そして、図３に示した相関関係を求めるため、データメモリ５４には、以下の表２に示した実験データ（本発明の相関関係データに相当する）が記憶されている。表２は、追焚き制御実行時に追焚き管路３内を循環する湯水の流量がＦ₁（大）であるときの、総バーナ加熱量（Ｑ_ALL）と第１差分温度（ΔＴ₁）における給湯熱量分配比（Ｋq）を実験により求めたデータである。
【００５８】
【表２】

【００５９】
図３のデータから、例えば、総バーナ加熱量（Ｑ_ALL）がＱ大_maxで第１差分温度（ΔＴ₁）が０℃であるときの給湯熱量分配比Ｋq大_maxＬ₁と、総バーナ加熱量（Ｑ_ALL）がＱ大_maxで第１差分温度（ΔＴ₁）が１０℃であるときの給湯熱量分配比Ｋq大_maxＨ₁とから、以下の式（４）により図３の▲１▼のグラフの関係式を導くことができる。
【００６０】
【数４】

【００６１】
同様にして、総バーナ加熱量（Ｑ_ALL）がＱ大_minで第１差分温度（ΔＴ₁）が０℃であるときの給湯熱量分配比Ｋq大_minＬ₁と、総バーナ加熱量（Ｑ_ALL）がＱ大_minで第１差分温度（ΔＴ₁）が１０℃であるときの給湯熱量分配比Ｋq大_minＨ₁とから、以下の式（５）により図３の▲２▼のグラフの関係式を導くことができる。
【００６２】
【数５】

【００６３】
また、総バーナ加熱量（Ｑ_ALL）がＱ中_maxで第１差分温度（ΔＴ₁）が０℃であるときの給湯熱量分配比Ｋq中_maxＬ₁と、総バーナ加熱量（Ｑ_ALL）がＱ中_maxで第１差分温度（ΔＴ₁）が１０℃であるときの給湯熱量分配比Ｋq中_maxＨ₁とから、以下の式（６）により図３の▲３▼のグラフの関係式を導くことができる。
【００６４】
【数６】

【００６５】
また、総バーナ加熱量（Ｑ_ALL）がＱ中_minで第１差分温度（ΔＴ₁）が０℃であるときの給湯熱量分配比Ｋq中_minＬ₁と、総バーナ加熱量（Ｑ_ALL）がＱ中_minで第１差分温度（ΔＴ₁）が１０℃であるときの給湯熱量分配比Ｋq中_minＨ₁とから、以下の式（７）により図３の▲２▼のグラフの関係式を導くことができる。
【００６６】
【数７】

【００６７】
また、総バーナ加熱量（Ｑ_ALL）がＱ小_maxで第１差分温度（ΔＴ₁）が０℃であるときの給湯熱量分配比Ｋq小_maxＬ₁と、総バーナ加熱量（Ｑ_ALL）がＱ小_maxで第１差分温度（ΔＴ₁）が１０℃であるときの給湯熱量分配比Ｋq小_maxＨ₁とから、以下の式（８）により図３の▲５▼のグラフの関係式を導くことができる。
【００６８】
【数８】

【００６９】
また、総バーナ加熱量（Ｑ_ALL）がＱ小_minで第１差分温度（ΔＴ₁）が０℃であるときの給湯熱量分配比Ｋq小_minＬ₁と、総バーナ加熱量（Ｑ_ALL）がＱ小_minで第１差分温度（ΔＴ₁）が１０℃であるときの給湯熱量分配比Ｋq小_minＨ₁とから、以下の式（９）により図３の▲６▼のグラフの関係式を導くことができる。
【００７０】
【数９】

【００７１】
なお、追焚き管路３内を循環する湯水の流量は、ポンプ１７の能力や追焚き管路３の長さに応じて変動する。そのため、データメモリ５４には、以下の表３に示したように、循環流量Ｆ₁よりも小さい値に設定した循環流量Ｆ₂（小）における実験データが記憶されている。
【００７２】
【表３】

【００７３】
そして、給湯器１の設置作業者によるコントローラ４に設けられた循環流量切替えスイッチ（図示しない）の操作に応じて、給湯熱量分配比把握手段５３は、循環流量Ｆ₁（大）に応じた上記表２のデータと、循環流量Ｆ₂（小）に応じた上記表３のデータとを切替えて上記式（４）〜式（９）により給湯熱量分配比Ｋqと第１差分温度ΔＴ₁との関係式を決定する。
【００７４】
これにより、追焚き管路３内を循環する湯水の流量に応じて、より精度良く、給湯熱量分配比（Ｋq）と第１差分温度（ΔＴ₁）との関係式を決定することができる。なお、さらに多くの種類の循環流量についての実験データをデータメモリ５４に記憶して、循環流量を選択できるようにすることによって、給湯熱量分配比（Ｋq）と第１差分温度（ΔＴ₁）との関係式をさらに精度良く導くことができる。
【００７５】
また、総バーナ加熱量（Ｑ_ALL）が、Ｑ大_max、Ｑ大_min、Ｑ中_max、Ｑ中_min、Ｑ小_max、Ｑ小_minのいずれかであるときは、上記式（４）〜式（９）から、給湯熱量分配比（Ｋq）を直接算出することができるが、例えばガス比例弁２２により総バーナ加熱量がＱ大_maxとＱ大_minの間に制御された場合には、給湯熱量分配比（Ｋq）を算出することができない。
【００７６】
そこで、かかる場合には、給湯熱量分配比把握手段５３は、以下の式（１０）により、給湯熱量分配比（Ｋq）を算出する。
【００７７】
【数１０】

【００７８】
ここで、Ｋq大_maxは算出時における第２差分温度（ΔＴ₂）を第１差分温度（ΔＴ₁）として上記式（４）により算出した給湯熱量分配比であり、Ｋq大_minは算出時における第２差分温度（ΔＴ₂）を第１差分温度（ΔＴ₁）として上記式（５）により算出した給湯熱量分配比である。
【００７９】
これにより、給湯熱量分配比把握手段５３は、総バーナ加熱量（Ｑ_ALL）がＱ大_maxとＱ大_minの間に制御されている場合の給湯熱量分配比（Ｋq）を精度良く算出することができる。
【００８０】
また、同様にして、総バーナ加熱量（Ｑ_ALL）がＱ中_maxとＱ中_minの間に制御されている場合は、給湯熱量分配比把握手段５３は、以下の式（１１）により、給湯熱量分配比（Ｋq）を算出する。
【００８１】
【数１１】

【００８２】
ここで、Ｋq中_maxは算出時における第２差分温度（ΔＴ₂）を第１差分温度（ΔＴ₁）として上記式（６）により算出した給湯熱量分配比であり、Ｋq中_minは算出時における第２差分温度ΔＴ₂を第１差分温度ΔＴ₁として上記式（７）により算出した給湯熱量分配比である。
【００８３】
また、総バーナ加熱量（Ｑ_ALL）がＱ小_maxとＱ小_minの間に制御されている場合は、給湯熱量分配比把握手段５３は、以下の式（１２）により、給湯熱量分配比（Ｋq）を算出する。
【００８４】
【数１２】

【００８５】
ここで、Ｋq小_maxは算出時における第２差分温度（ΔＴ₂）を第１差分温度（ΔＴ₁）として上記式（８）により算出した給湯熱量分配比であり、Ｋq小_minは算出時における第２差分温度（ΔＴ₂）を第１差分温度（ΔＴ₁）として上記式（９）により算出した給湯熱量分配比である。
【００８６】
なお、本実施の形態では、「大燃焼」における最大燃焼量（Ｑ大_max）と最小燃焼量（Ｑ大min）とを用いて、総バーナ加熱量（Ｑ_ALL）がＱ大_maxとＱ大_minの間に制御されているときの給湯熱量分配比（Ｋq）を算出したが、Ｑ大_maxとＱ大_minの間の加熱量についても何点か給湯熱量分配比（Ｋq）と第１差分温度（ΔＴ₁）との関係式を導くためのデータをデータメモリ５４に記憶しておき、制御されている総バーナ燃焼量（Ｑ_ALL）により近い加熱量についての関係式を用いて上記式（１０）におけるＫq大_maxとＫq大_minとを算出してもよい。
【００８７】
これにより、総バーナ加熱量（Ｑ_ALL）が、Ｑ大_maxとＱ大_minの間に制御されているときの給湯熱量分配比（Ｋq）をより精度良く算出することができる。「中燃焼」、「小燃焼」についても同様である。
【００８８】
また、本実施の形態では、風呂サーミスタ１８により検出される追焚き管路３から追焚き熱交換器７に供給される湯水の温度と、熱交サーミスタ１２により検出される給湯熱交換器８から給湯管路２に供給される湯の温度との差を、本発明の第２差分温度（ΔＴ₂）としたが、風呂サーミスタ１８の検出温度と、リモコン４０により設定された目標給湯温度（Ｔ_A）から、以下の式（１３）により算出した給湯熱交換器８から供給される湯の温度（Ｔ_EXC，この場合、本発明の所定温度に相当する）との差を第２差分温度（ΔＴ₂）としてもよい。
【００８９】
【数１３】

【００９０】
ここで、λは上述したバイパス比、Ｔ_Wは上記式（１）により算出した給水温度である。なお、水道管からの給水温度を検出する温度センサを設け、該温度センサの検出温度をＴ_Wとして上記式（１３）から給湯熱交換器８から供給される湯の温度（Ｔ_EXC）を求めてもよい。
【００９１】
このように、熱交サーミスタ１２の検出温度（Ｔ_EX）ではなく、目標給湯温度（Ｔ_A）を用いて算出した温度（Ｔ_EXC）により第２差分温度（ΔＴ₂）を設定することによって、総バーナ加熱量（Ｑ_ALL）の制御系の応答性が速過ぎて給湯熱交換器８から給湯される湯の温度が不安定となる場合に、給湯管路２からの給湯温度を安定させることができる。
【００９２】
また、本実施の形態では、データメモリ５４に、本発明の相関関係データとして上記表２と表３に示したデータを記憶し、該データから上記式（４）〜式（９）の関係式を導いたが、上記式（４）〜式（９）の関係式のデータを本発明の相関関係データとして直接データメモリ５４に記憶しておくようにしてもよい。
【００９３】
また、追焚きと給湯を同時に実行している時に、浴槽４に貯められた湯水の量（Ｗ）を、給湯熱量分配比（Ｋq）と総バーナ加熱量（Ｑ_ALL）と追焚き熱交換器７と給湯熱交換器８とのトータルの熱効率（η）とから算出した追焚き熱交換器７側で湯水の加熱に使用される熱量（Ｑ_F＝（１−Ｋq）・Ｑ_ALL・η）と、風呂サーミスタ１８の検出温度の上昇度合い（ΔＴ_F）とから、以下の式（１４）により算出することができる。
【００９４】
【数１４】

【００９５】
この場合には、追焚き熱交換器７からの出湯温度を検出するサーミスタを設けることなく、浴槽４に貯められた湯水の量を精度良く把握することができる。
【００９６】
また、本実施の形態では、本発明の相関関係データとして、表２及び表３に示したように、給湯と追焚きを同時に実行した場合の各総バーナ加熱量（Ｑ大_max〜Ｑ小_min）における給湯熱量分配比（Ｋq）と第１差分温度（ΔＴ₁）との対応データをデータメモリ５４に記憶させたが、各総バーナ加熱量（Ｑ大_max〜Ｑ小_min）における給湯熱交換器８側の熱効率（η_H）（η_H＝Ｋq・ηの関係となる）と第１差分温度（ΔＴ₁）との対応データを、本発明の相関関係データとしてデータメモリ５４に記憶させるようにしてもよい。
【００９７】
この場合には、総バーナ加熱量（Ｑ_ALL）は、目標給湯温度（Ｔ_A）、水道管からの給水温度（Ｔ_W）、水量センサ１３の検出水量（Ｆ_W）、及び給湯熱交換器８側の熱効率（η_H）から、以下の式（１５）により算出することができる。
【００９８】
【数１５】

【００９９】
さらに、給湯と追焚きとを同時に実行した場合の各総バーナ加熱量（Ｑ大_max〜Ｑ小_min）における給湯熱交換器８と追焚き熱交換器７のトータルの熱効率（η）と第１差分温度（ΔＴ₁）との対応データを、データメモリ５４に記憶させておくことにより、追焚き熱交換器７側で湯水の加熱に実際に使用される熱量（Ｑ_F）を以下の式（１６）により算出することができる。
【０１００】
【数１６】

【０１０１】
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。
【図３】バーナによる総加熱量に対する給湯管路の加熱に使用される熱量の割合を求めための相関関係を示したグラフ。
【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 supply control in a so-called single-can two-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, these heat exchangers are heated by, for example, a gas burner. However, when performing hot water supply and reheating at the same time, the amount of heating by the gas burner depends on the reheating heat exchanger and the hot water heat exchanger. Distributed to.
[0003]
And it is necessary to control the heating amount of the gas burner so that the temperature of the hot water supplied from the hot water supply heat exchanger is matched with the target temperature set by the user. It is necessary to accurately grasp the proportion of the amount of heat used for heating the heat exchanger for hot water supply among the amount of heat generated by.
[0004]
Therefore, conventionally, the temperature sensor detects the temperature of the hot water supplied from the tracking pipe to the heating heat exchanger, and the temperature of the hot water supplied from the tracking heat exchanger to the tracking pipe. A return temperature sensor is provided for detecting the amount of heat used for heating the heat exchanger for heating from the difference between the detected temperatures of the two temperature sensors and the flow rate of hot water flowing through the heating pipe, and a known gas burner. The amount of heat used to heat the hot water heat exchanger was calculated by subtracting the amount of heat from the total amount of heating.
[0005]
However, in this case, since it is necessary to provide a return temperature sensor in addition to the normal temperature sensor that is usually provided to monitor and display the temperature of hot water stored in the bathtub, there is a disadvantage in that the cost increases. .
[0006]
[Problems to be solved by the invention]
The present invention has been made in view of the above-mentioned background, and is used for heating on the side of a hot water supply heat exchanger when performing reheating and hot water supply at the same time in a single can and two water channel type hot water heater with reheating. An object of the present invention is to provide a reheating water heater that can accurately grasp the amount of heating to be performed at low cost.
[0007]
[Means for Solving the Problems]
The present invention has been made in order to achieve the above-mentioned object, and supplies hot water by heating a water supply pipe through which a predetermined flow rate of hot water is circulated to replenish the bath, and water supplied from the water supply. A hot water supply line for heating, a reheating heat exchanger for heating the hot water flowing through the reheating pipe, and a part of the reheating heat exchanger for heating the water flowing through the hot water supply line A hot water supply heat exchanger, a heating means for heating the reheating heat exchanger and the hot water supply heat exchanger, a heating amount adjusting means for adjusting the heating amount of the heating means, and reheating and hot water supply are executed simultaneously. Sometimes, a hot water supply heat quantity distribution ratio grasping means for grasping a hot water supply heat quantity distribution ratio, which is a ratio of the amount of heat used for heating the hot water supply heat exchanger with respect to the heating amount, and the hot water supply pipe line according to the hot water supply heat quantity distribution ratio The heating amount of the heating means required for supplying hot water of a predetermined temperature from And relates to reheating with water heater improvement and a hot water supply control means for controlling the heating amount of said heating means through said heating amount adjusting means so that the pressurized heat obtained.
[0008]
The inventors of the present application have conducted various studies to achieve the above object, and as a result, when the reheating and hot water supply are simultaneously performed in the reheating water heater, the reheating heat is supplied from the reheating pipeline. Used for heating the hot water supply heat exchanger out of the temperature difference between the temperature of hot water supplied to the exchanger and the temperature of hot water supplied from the hot water supply heat exchanger to the hot water supply line, and the heating amount of the heating means It was found that there is a correlation with the ratio of the amount of heat generated.
[0009]
In view of this, the first aspect of the present invention is the additional water temperature detecting means for detecting the temperature of hot water supplied from the additional pipe to the additional heat exchanger, and the hot water supply pipe from the hot water heat exchanger. A hot water supply temperature detecting means for detecting the temperature of hot water supplied to the passage, and a heating amount of the heating means. Predetermined heating amount In the case where the reheating and hot water supply are simultaneously executed with the setting, the temperature of hot water supplied from the reheating pipe to the reheating heat exchanger and the hot water supply from the hot water heat exchanger to the hot water supply pipe Storage means for storing correlation data indicating a correlation between a first differential temperature that is a difference from the temperature of hot water and the hot water supply heat amount distribution ratio, and the hot water supply heat amount distribution ratio grasping means includes the additional water Applying a second differential temperature, which is a temperature difference between the temperature detected by the temperature detecting means and the temperature detected by the hot-water supply hot water temperature detecting means, as the first differential temperature to the correlation data, the second differential temperature and the Predetermined heating amount The hot water supply heat quantity distribution ratio is calculated.
[0010]
According to the present invention, the temperature of hot water supplied to the storage heat exchanger from the reheating pipe and the temperature of hot water supplied from the hot water heat exchanger to the hot water supply are stored in the storage means. Correlation data indicating the correlation between the first difference temperature, which is the difference between the two, and the hot water supply heat amount distribution ratio is stored. Therefore, the hot water supply heat quantity distribution ratio grasping means uses the second differential temperature, which is the difference between the temperature detected by the additional water temperature detecting means and the temperature detected by the hot water temperature detecting means, as the first differential temperature. By applying to the data, the second differential temperature and the Predetermined heating amount It is possible to accurately grasp the hot water supply heat distribution ratio. In this case, it is not necessary to provide temperature detecting means for detecting the hot water supplied from the hot water supply heat exchanger to the tracking pipe.
[0011]
Further, according to a second aspect of the present invention, in the hot water heater with reheating, additional water temperature detection means for detecting a temperature of hot water supplied from the reheating pipeline to the reheating heat exchanger, When the heating amount of the heating means is set to a predetermined heating amount and the reheating and hot water supply are executed simultaneously, the temperature of the hot water supplied from the reheating pipeline to the reheating heat exchanger and the hot water supply heat exchanger Storage means for storing correlation data indicating a correlation between a first differential temperature, which is a difference between the temperature of hot water supplied to the hot water supply pipe and the hot water heat quantity distribution ratio, and the hot water supply heat quantity distribution The ratio grasping means applies a second differential temperature, which is a temperature difference between the detected temperature of the additional water temperature detecting means and the predetermined temperature, to the correlation data as the first differential temperature, and the second differential temperature And said Predetermined heating amount The hot water supply heat quantity distribution ratio is calculated.
[0012]
According to the present invention, the second differential temperature is set to the difference between the detected temperature of the additional water temperature detecting means and the predetermined temperature, so that the hot water supplied from the hot water heat exchanger to the hot water supply pipe line is obtained. If the temperature difference of the hot water is too fast and the second differential temperature is calculated using the measured temperature of the hot water to calculate the hot water supply heat quantity distribution ratio, the hot water supplied from the hot water heat exchanger to the hot water supply pipe is When the temperature of the water becomes unstable, the temperature of the hot water can be stabilized.
[0013]
Further, in the first aspect and the second aspect, the storage means stores the correlation data individually for a plurality of types of the predetermined heating amounts, and the hot water supply heat quantity distribution ratio grasping means. Selects correlation data to which the second differential temperature is applied from among the plurality of correlation data stored in the storage unit according to the heating amount of the heating unit determined by the hot water supply control unit It is characterized by doing.
[0014]
According to the present invention, the hot water supply heat amount distribution ratio at the second differential temperature can be calculated with respect to the plurality of types of predetermined heating amounts.
[0015]
Further, the hot water supply distribution ratio grasping means responds to a predetermined heating amount larger than the heating amount when the heating amount of the heating means determined by the hot water supply control means does not coincide with any of the plurality of predetermined heating amounts. Further, the second differential temperature is applied to the correlation data according to the hot water distribution ratio calculated by applying the second differential temperature to the correlation data and the predetermined heating amount smaller than the heating amount. The hot water supply heat amount distribution ratio at the second differential temperature difference and the heating amount is calculated based on the hot water supply heat amount distribution ratio.
[0016]
According to the present invention, even if the heating amount of the heating unit determined by the hot water supply control unit does not coincide with any of the plurality of predetermined heating amounts, the hot water distribution ratio grasping unit is the second unit. It is possible to calculate the hot water supply heat amount distribution ratio in the difference temperature difference and the heating amount.
[0017]
In the first aspect and the second aspect, the plurality of pieces stored in the storage unit Predetermined heating amount Includes the maximum heating amount and the minimum heating amount of the heating means that can be adjusted by the heating amount adjusting means.
[0018]
According to the present invention, the hot water supply control means can sufficiently control the temperature of the hot water supplied from the hot water supply heat exchanger to the hot water supply line by fully exerting the capability of the heating means.
[0019]
Further, in the first aspect and the second aspect, a circulation flow rate selecting unit for selecting the predetermined flow rate from a plurality of types of flow rates is provided, and the storage unit is provided for the plurality of types of flow rates. The correlation data is individually stored, and the hot water supply heat amount distribution ratio grasping means applies the second differential temperature to the correlation data according to the flow rate selected by the circulation flow rate selection means, The hot water supply heat distribution ratio at the second differential temperature and the flow rate is calculated.
[0020]
According to the present invention, the flow rate of the hot water flowing through the follow-up pipe line depends on the installation situation of the hot-water supply with the follow-up hot water, the capacity of the circulation pump provided to circulate the hot water, and the follow-up pipe When the length varies depending on the length of the path, the hot water supply heat distribution ratio can be calculated with higher accuracy by setting the predetermined flow rate to a flow rate closer to the flow rate by the circulation flow rate selection means.
[0021]
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 reheating according to the present invention, FIG. 2 is a control block diagram of the hot water heater with reheating shown in FIG. 1, and FIG. It is the graph which showed the correlation for calculating | requiring the ratio of the calorie | heat amount used for the heating by the side of a hot water supply pipe line.
[0022]
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 and supplying hot water supplied from the water pipe through the hot water supply pipe 2 and a function of heating and chasing the hot water stored in the bathtub 4.
[0023]
The entire operation of the water heater 1 is controlled by a controller 4, and a first burner 5 that operates according to a control signal from the controller 4, a second burner 6 that has a heating capability lower than that of the first burner, and a first burner 5, A reheating heat exchanger 7 heated by the second burner 6, a hot water supply heat exchanger 8, and a part of the water supplied from the water pipe to the hot water supply pipe line 2 is bypassed by the hot water supply heat exchanger 8 to exchange hot water supply heat. A bypass pipe 9 mixed in hot water discharged from the water heater 8, a bypass servo 10 for adjusting the opening degree of the bypass pipe 9 by a control signal from the controller 4, a downstream side of the junction X of the hot water supply pipe line 2 and the bypass pipe 9 A hot water thermistor 11 that detects the temperature of the hot water and outputs a detection signal to the controller 4, and a heat exchanger thermistor 12 that detects the temperature of the hot water near the outlet of the hot water heat exchanger 8 and outputs a detection signal to the controller 4 (Corresponding to a bright hot water supply hot water temperature detecting means), a water amount sensor 13 for detecting the flow rate of water supplied from the water supply to the hot water supply pipe 2 and outputting a detection signal to the controller 4, and supplied from the hot water supply pipe 2 A hot water servo 14 for adjusting the hot water flow rate is provided.
[0024]
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 (corresponding to the additional water temperature detecting means of the present invention) that detects the temperature of the hot water and the like and detects the presence or absence of hot water flowing in the additional pipe 3. Bath water flow detector that outputs detection signal to controller 4 A hot water amount sensor 20 that detects the flow rate of hot water supplied from the hot water supply pipe 2 to the bathtub 4 via the hot water filling relay pipe 30 and the additional pipe 3 and outputs a detection signal to the controller 4. Prepare.
[0025]
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.
[0026]
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. The water pipe thermistor 29 is provided in order to prevent water staying in the hot water supply heat exchanger 8 from being heated and abnormally heated when only the reheating control is executed alone. When the detected temperature 29 exceeds a predetermined upper limit temperature, the controller 4 stops the combustion of the first burner 5 and the second burner 6.
[0027]
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.
[0028]
Next, referring to FIG. 2, the controller 4 includes a hot water supply control means 50 for performing hot water supply control for supplying hot water at a target hot water supply temperature from the hot water supply pipe 2, and the hot water stored in the bathtub 4 to the target reheating temperature. Reheating control means 51 for performing reheating control for raising the temperature, hot water control means 52 for performing hot water control for supplying hot water at a target hot water temperature to the bathtub by the target hot water amount, the first burner 5 and the second The hot water supply heat quantity distribution ratio grasping means 53 for calculating the ratio of the amount of heat used for heating on the hot water supply heat exchanger 8 side in the total heating amount by the burner 6 (hereinafter referred to as the total burner heating amount), and the hot water supply control A data memory 54 (corresponding to the storage means of the present invention) in which data necessary for execution is stored.
[0029]
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.
[0030]
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 heating 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 heating amount in “large combustion”, “medium combustion”, and “small combustion” more finely by changing the opening of the gas proportional valve 22.
[0031]
Here, as shown in Table 1 below, the data memory 54 stores the maximum heating amount (Q large in “large combustion”). _max ) And minimum heating amount (Q large min), maximum heating amount in medium combustion (Q medium) _max ) And minimum heating (in Q) _min ), And the maximum heating amount (small Q) in “small combustion” _max ) And minimum heating (Q small) _min ) Data (obtained by experiments and calculations).
[0032]
[Table 1]

[0033]
Therefore, the hot water supply control means 50 calculates the total amount of the first burner 5 and the second burner 6 in the “large combustion”, “medium combustion”, and “small combustion” from the data in Table 1 and the opening degree of the gas proportional valve 22. Burner heating amount (Q _ALL ). 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 actually used to heat water in the hot water supply heat exchanger 8 (Q _R ) And the water supply temperature from the water pipe (T _W ). The amount of heat (Q _R ) Is the total burner heating amount (Q _ALL ) Multiplied by the total thermal efficiency (η) of the reheating heat exchanger 7 and the hot water supply heat exchanger 8.
[0034]
This total thermal efficiency (η) is the total burner heating (Q _ALL ) States (Q large) _max ~ Q small _min ) And stored in the data memory 54.
[0035]
[Expression 1]

[0036]
Then, the hot water supply control means 50 determines the temperature of hot water supplied to the downstream side of the junction X between the hot water supply pipe line 2 and the bypass pipe 9 as a target hot water supply temperature (T _A ) Total burner heating amount (Q _ALL ) Is calculated by the following equation (2).
[0037]
[Expression 2]

[0038]
And the hot-water supply control means 50 is the total burner heating amount (Q calculated by said Formula (2). _ALL ) Is controlled, the opening of the gas proportional valve 22, the rotational speed of the combustion fan 25, and the opening and closing of the first gas solenoid valve 23 and the second gas solenoid valve 24 are controlled.
[0039]
In this way, the total burner heating amount (Q _ALL ) Is basically controlled from the hot water supply line 2 to the target hot water temperature (T _A ) Is supplied, but the temperature detected by the hot water supply thermistor 11 (T _H ) Is the target hot water supply temperature (T _A ), The hot water supply control means 50 further determines the total burner heating amount (Q _ALL ). The hot water amount servo 14 finely adjusts the amount of water supplied to the hot water supply pipe 2 so as not to exceed the maximum capacity of the water heater 1.
[0040]
Then, when the hot water control means 50 detects from the detection signal of the water amount sensor 13 that the water supply from the water pipe to the hot water supply pipe 2 has been stopped because the curan is closed by the user, The first gas solenoid valve 23 and the second gas solenoid valve 24 are closed, the operation of the combustion fan 25 is stopped, and the hot water supply control is finished.
[0041]
Next, the chasing control means 51 starts chasing control in response to the chasing start instruction from the remote controller 40. The chasing control means 51 operates the pump 17 to circulate hot water in the bathtub 4 to the chasing pipe 3, and in this state, the chasing heat exchanger 7 is heated by the first burner 5 and chasing. Hot water circulating in the pipe 3 is heated. As a result, the hot water stored in the bathtub 4 is gradually heated, and when the detected temperature of the bath thermistor 18 reaches the target tracking temperature set by the remote controller 40, the tracking control means 51 has the first burner. 5 is stopped and the chasing control is terminated.
[0042]
The chasing control means 51 checks whether or not the water flow is detected by the bath water flow switch 19 when the pump 17 is operated. When the water flow is detected by the bath water flow switch 19 and it can be determined that hot water is stored in the bathtub 4, the chasing control is executed.
[0043]
Further, the hot water filling control means 52 starts the hot water filling control in response to the hot water filling start instruction from the remote controller 40. The hot water filling control means 52 first opens the hot water solenoid valve 15, thereby starting water supply from the water pipe to the hot water filling pipe line 2, and the hot water supply control means 50 sets the target hot water set by the remote controller 40. Hot water supply control at the tension temperature is started. Then, hot water having a target hot water temperature is supplied from the hot water supply pipe 2 to the bathtub 4 via the hot water relay pipe 30 and the follow-up pipe 3.
[0044]
The hot water filling control means 52 grasps the amount of hot water stored in the bathtub 4 from the hot water supply flow rate detected by the hot water amount sensor 20 and the hot water supply time, and the hot water amount becomes the target hot water filling amount set by the remote controller 40. When reaching, the hot water solenoid valve 15 is closed and the hot water filling control is finished.
[0045]
Next, as described above, when the hot water supply control is performed independently, the total burner heating amount (Q by the first burner 5 and the second burner 6) _ALL ) Is used to heat the water passing through the hot water heat exchanger 8. Therefore, the target hot water supply temperature (T _A ) Total burner heating amount required to supply hot water (Q) _ALL ).
[0046]
However, when performing hot water supply control and reheating control simultaneously, the total burner heating amount (Q by the first burner 5 and the second burner 6) _ALL ) Is used to heat the water passing through the hot water supply heat exchanger 8 and also used to heat the hot water passing through the reheating heat exchanger 7.
[0047]
Therefore, when performing hot water supply control and reheating control simultaneously, the total burner heating amount (Q _ALL ), It is necessary to grasp the amount of heat distributed to the hot water supply heat exchanger 8 side and perform hot water supply control.
[0048]
Therefore, the hot water supply heat amount distribution ratio grasping means 53 provided in the controller 1 is used for the total burner heating amount (Q _ALL The hot water supply heat quantity distribution ratio (Kq), which is the ratio of the amount of heat used for heating the hot water supply heat exchanger 8 to the hot water supply heat exchanger 8, is calculated, and the hot water supply control means 50 calculates the target hot water supply temperature (Kq) T _A ) Total burner heating required for hot water supply (Q) _ALL ). Hereinafter, a calculation procedure of the hot water supply heat amount distribution ratio (Kq) by the hot water supply heat amount distribution ratio grasping means 53 will be described.
[0049]
The inventors of the present application have studied various methods for calculating the hot water supply heat quantity distribution ratio, and as a result, the temperature of hot water supplied from the reheating line 3 to the reheating heat exchanger 7 and the hot water supply line from the hot water heat exchanger 8 are calculated. The first differential temperature (ΔT, which is the difference from the temperature of the hot water supplied to 2 ₁ ) And the hot water supply heat quantity distribution ratio (Kq) were found to be proportional.
[0050]
This is because as the temperature of hot water supplied to the reheating heat exchanger 7 (= temperature of hot water stored in the bathtub 4) is lower, the amount of heat used on the reheating heat exchanger 7 side increases, Since the temperature of the water supplied from the water pipe is considered to be almost constant, the amount of heat used on the hot water supply heat exchanger 8 side increases as the temperature of the hot water supplied from the hot water supply heat exchanger 8 increases. It is considered that the difference is proportional to the hot water supply heat quantity distribution ratio (Kq).
[0051]
FIG. 3 shows the maximum heating amount (Q _max ) And minimum heating amount (Q large min), maximum heating amount in medium combustion (Q medium) _max ) And minimum heating (in Q) _min ), And the maximum heating amount (small Q) in “small combustion” _max ) And minimum heating (Q small) _min ) And the first temperature difference (ΔT) ₁ It is the graph which showed the correlation with). In the figure, (1) is large Q _max , ▲ 2 ▼ is Q large min, ▲ 3 ▼ is Q _max , ▲ 4 ▼ is in Q _min 、 ▲ 5 ▼ is small Q _max , ▲ 6 ▼ is small Q _min It corresponds to each.
[0052]
The hot water supply heat quantity distribution ratio grasping means 53 includes the temperature of hot water supplied from the reheating line 3 detected by the bath thermistor 18 to the reheating heat exchanger 7, and the hot water supply heat exchanger 8 detected by the heat exchange thermistor 12. The second differential temperature (ΔT), which is the difference from the temperature of hot water supplied to the hot water supply pipe 2 from ₂ ) For the first differential temperature (ΔT in the graph shown in FIG. ₁ ) As the second differential temperature (ΔT when the reheating control and the hot water supply control are executed simultaneously. ₂ ) To calculate the hot water distribution ratio (Kq).
[0053]
Then, the hot water supply control means 50 uses the hot water supply heat quantity distribution ratio (Kq) calculated by the hot water supply heat quantity distribution ratio grasping means 53 to use the target temperature (T _A ) Total burner heating amount (Q _ALL ') Is calculated by the following equation (3), and the total burner heating amount (Q _ALL The combustion amount of the first burner 5 and the second burner 6 is controlled so that ') is obtained.
[0054]
[Equation 3]

[0055]
Where Q _ALL Is the total burner heating amount calculated from the above equation (2).
[0056]
In this way, the total burner heating amount (Q is calculated using the hot water supply calorie distribution ratio (Kq). _ALL ), The hot water supply control means 50 can control the hot water supply temperature with high accuracy even when the reheating control and the hot water supply control are executed simultaneously.
[0057]
In order to obtain the correlation shown in FIG. 3, the data memory 54 stores experimental data (corresponding to the correlation data of the present invention) shown in Table 2 below. Table 2 shows that the flow rate of hot water circulating in the tracking pipe 3 is F when the tracking control is executed. ₁ (Large) total burner heating amount (Q _ALL ) And the first differential temperature (ΔT ₁ ) Is a data obtained by experiment for the hot water heat distribution ratio (Kq).
[0058]
[Table 2]

[0059]
From the data in FIG. 3, for example, the total burner heating amount (Q _ALL ) Is large Q _max The first differential temperature (ΔT ₁ ) Is 0 ° C, hot water distribution ratio Kq is large _max L ₁ And total burner heating (Q _ALL ) Is large Q _max The first differential temperature (ΔT ₁ ) Is 10 ° C, the hot water distribution ratio Kq is large _max H ₁ From the above, the relational expression of the graph (1) in FIG.
[0060]
[Expression 4]

[0061]
Similarly, total burner heating amount (Q _ALL ) Is large Q _min The first differential temperature (ΔT ₁ ) Is 0 ° C, hot water distribution ratio Kq is large _min L ₁ And total burner heating (Q _ALL ) Is large Q _min The first differential temperature (ΔT ₁ ) Is 10 ° C, the hot water distribution ratio Kq is large _min H ₁ From the above, the relational expression of the graph (2) in FIG.
[0062]
[Equation 5]

[0063]
The total burner heating amount (Q _ALL ) In Q _max The first differential temperature (ΔT ₁ ) Is hot water heat distribution ratio Kq when it is 0 ° C _max L ₁ And total burner heating (Q _ALL ) In Q _max The first differential temperature (ΔT ₁ ) Is hot water heat distribution ratio Kq when it is 10 ℃ _max H ₁ From the above, the relational expression of the graph (3) in FIG.
[0064]
[Formula 6]

[0065]
The total burner heating amount (Q _ALL ) In Q _min The first differential temperature (ΔT ₁ ) Is hot water heat distribution ratio Kq when it is 0 ° C _min L ₁ And total burner heating (Q _ALL ) In Q _min The first differential temperature (ΔT ₁ ) Is hot water heat distribution ratio Kq when it is 10 ℃ _min H ₁ From the above, the relational expression of the graph (2) in FIG. 3 can be derived from the following expression (7).
[0066]
[Expression 7]

[0067]
The total burner heating amount (Q _ALL ) Is small Q _max The first differential temperature (ΔT ₁ ) Is 0 ° C, hot water distribution ratio Kq is small _max L ₁ And total burner heating (Q _ALL ) Is small Q _max The first differential temperature (ΔT ₁ ) Is 10 ° C, hot water distribution ratio Kq is small _max H ₁ Therefore, the relational expression of the graph (5) in FIG. 3 can be derived from the following expression (8).
[0068]
[Equation 8]

[0069]
The total burner heating amount (Q _ALL ) Is small Q _min The first differential temperature (ΔT ₁ ) Is 0 ° C, hot water distribution ratio Kq is small _min L ₁ And total burner heating (Q _ALL ) Is small Q _min The first differential temperature (ΔT ₁ ) Is 10 ° C, hot water distribution ratio Kq is small _min H ₁ Therefore, the relational expression of the graph (6) in FIG. 3 can be derived from the following expression (9).
[0070]
[Equation 9]

[0071]
Note that the flow rate of the hot water circulating in the tracking pipe 3 varies depending on the capacity of the pump 17 and the length of the tracking pipe 3. Therefore, the data memory 54 stores the circulation flow rate F as shown in Table 3 below. ₁ Circulating flow rate F set to a smaller value than ₂ The experimental data in (small) is stored.
[0072]
[Table 3]

[0073]
Then, in response to an operation of a circulation flow rate switch (not shown) provided in the controller 4 by an operator who installs the water heater 1, the hot water supply heat quantity distribution ratio grasping means 53 is connected to the circulation flow rate F. ₁ (Large) data in Table 2 above and circulation flow rate F ₂ The data in Table 3 is switched according to (small), and the hot water supply heat quantity distribution ratio Kq and the first differential temperature ΔT are calculated by the above equations (4) to (9). ₁ Is determined.
[0074]
Accordingly, the hot water supply heat quantity distribution ratio (Kq) and the first differential temperature (ΔT) are more accurately determined according to the flow rate of the hot water circulating in the reheating conduit 3. ₁ ) Can be determined. It should be noted that experimental data on more types of circulating flow rates are stored in the data memory 54 so that the circulating flow rate can be selected, whereby the hot water supply heat distribution ratio (Kq) and the first differential temperature (ΔT ₁ ) Can be derived with higher accuracy.
[0075]
The total burner heating amount (Q _ALL ) But large Q _max , Q large _min During Q _max During Q _min , Q small _max , Q small _min In any case, the hot water supply heat quantity distribution ratio (Kq) can be directly calculated from the above equations (4) to (9). For example, the gas proportional valve 22 causes the total burner heating amount to be large by Q. _max And Q _min If it is controlled during this period, the hot water supply heat quantity distribution ratio (Kq) cannot be calculated.
[0076]
Therefore, in such a case, the hot water supply heat quantity distribution ratio grasping means 53 calculates the hot water supply heat quantity distribution ratio (Kq) by the following equation (10).
[0077]
[Expression 10]

[0078]
Where Kq is large _max Is the second differential temperature (ΔT ₂ ) For the first differential temperature (ΔT ₁ ) Is the hot water distribution ratio calculated by the above equation (4), and Kq is large _min Is the second differential temperature (ΔT ₂ ) For the first differential temperature (ΔT ₁ ) Is the hot water supply heat amount distribution ratio calculated by the above equation (5).
[0079]
As a result, the hot water supply heat quantity distribution ratio grasping means 53 determines the total burner heating amount (Q _ALL ) Is large Q _max And Q _min It is possible to accurately calculate the hot water supply heat amount distribution ratio (Kq) when it is controlled during this period.
[0080]
Similarly, the total burner heating amount (Q _ALL ) In Q _max And Q _min If it is controlled during this period, the hot water supply heat amount distribution ratio grasping means 53 calculates the hot water supply heat amount distribution ratio (Kq) by the following equation (11).
[0081]
## EQU11 ##

[0082]
Where in Kq _max Is the second differential temperature (ΔT ₂ ) For the first differential temperature (ΔT ₁ ) Is the hot water supply heat quantity distribution ratio calculated by the above equation (6), and in Kq _min Is the second differential temperature ΔT at the time of calculation ₂ The first differential temperature ΔT ₁ As a hot water supply heat quantity distribution ratio calculated by the above equation (7).
[0083]
The total burner heating amount (Q _ALL ) Is small Q _max And Q small _min If it is controlled during this period, the hot water supply heat quantity distribution ratio grasping means 53 calculates the hot water supply heat quantity distribution ratio (Kq) by the following equation (12).
[0084]
[Expression 12]

[0085]
Where Kq is small _max Is the second differential temperature (ΔT ₂ ) For the first differential temperature (ΔT ₁ ) Is the hot water supply heat quantity distribution ratio calculated by the above equation (8), and Kq small _min Is the second differential temperature (ΔT ₂ ) For the first differential temperature (ΔT ₁ ) Is the hot water supply heat quantity distribution ratio calculated by the above equation (9).
[0086]
In the present embodiment, the maximum combustion amount in “large combustion” (Q large _max ) And the minimum combustion amount (Q large min), the total burner heating amount (Q _ALL ) Is large Q _max And Q _min The calorific value distribution ratio (Kq) for hot water supply when it is controlled during _max And Q _min As for the amount of heating during the period, the hot water distribution ratio (Kq) and the first differential temperature (ΔT) ₁ ) Is stored in the data memory 54, and the total burner combustion amount (Q _ALL ) Using the relational expression for the heating amount closer to _max And Kq _min And may be calculated.
[0087]
As a result, the total burner heating amount (Q _ALL ) But large Q _max And Q _min It is possible to calculate the hot water supply heat distribution ratio (Kq) when it is controlled during the period with higher accuracy. The same applies to “medium combustion” and “small combustion”.
[0088]
In the present embodiment, the temperature of the hot water supplied from the reheating line 3 detected by the bath thermistor 18 to the reheating heat exchanger 7 and the hot water supply heat exchanger 8 detected by the heat exchange thermistor 12 are also shown. The difference between the temperature of hot water supplied to the hot water supply pipe 2 and the second differential temperature (ΔT ₂ ), But the detected temperature of the bath thermistor 18 and the target hot water temperature (T _A ) From the hot water supply heat exchanger 8 calculated by the following equation (13) (T _EXC , In this case, the difference from the predetermined temperature of the present invention is the second difference temperature (ΔT ₂ ).
[0089]
[Formula 13]

[0090]
Where λ is the bypass ratio described above, T _W Is the feed water temperature calculated by the above equation (1). A temperature sensor for detecting the temperature of the water supply from the water pipe is provided, and the temperature detected by the temperature sensor is T _W As shown in the above equation (13), the temperature of hot water supplied from the hot water supply heat exchanger 8 (T _EXC ) May be requested.
[0091]
Thus, the detected temperature (T _EX ), Not the target hot water supply temperature (T _A ) (T) calculated using _EXC ) To obtain the second differential temperature (ΔT ₂ ) To set the total burner heating (Q _ALL When the temperature of the hot water supplied from the hot water supply heat exchanger 8 becomes unstable due to the responsiveness of the control system)), the hot water supply temperature from the hot water supply pipe 2 can be stabilized.
[0092]
In the present embodiment, the data shown in Tables 2 and 3 are stored in the data memory 54 as the correlation data of the present invention, and the relational expressions (4) to (9) are stored from the data. However, the data of the relational expressions (4) to (9) may be directly stored in the data memory 54 as the correlation data of the present invention.
[0093]
In addition, when reheating and hot water supply are performed simultaneously, the amount of hot water stored in the bathtub 4 (W) is calculated from the hot water supply heat distribution ratio (Kq) and the total burner heating amount (Q _ALL ) And the additional heat exchanger 7 and the hot water supply heat exchanger 8 and the amount of heat (Q) used for heating the hot water on the additional heat exchanger 7 side calculated from the total thermal efficiency (η). _F = (1-Kq) ・ Q _ALL Η) and the degree of increase in the temperature detected by the bath thermistor 18 (ΔT _F ) And the following equation (14).
[0094]
[Expression 14]

[0095]
In this case, it is possible to accurately grasp the amount of hot water stored in the bathtub 4 without providing a thermistor for detecting the temperature of the hot water discharged from the reheating heat exchanger 7.
[0096]
Further, in the present embodiment, as the correlation data of the present invention, as shown in Tables 2 and 3, each total burner heating amount (Q large) when hot water supply and reheating are executed simultaneously. _max ~ Q small _min ) And the first differential temperature (ΔT) ₁ ) Is stored in the data memory 54, but each total burner heating amount (Q large) _max ~ Q small _min ) In the hot water supply heat exchanger 8 side (η _H ) (Η _H = Kq · η) and the first differential temperature (ΔT ₁ ) May be stored in the data memory 54 as correlation data of the present invention.
[0097]
In this case, the total burner heating amount (Q _ALL ) Is the target hot water supply temperature (T _A ), Water supply temperature from water pipe (T _W ), The amount of water detected by the water amount sensor 13 (F _W ), And the thermal efficiency of the hot water supply heat exchanger 8 (η _H ) From the following equation (15).
[0098]
[Expression 15]

[0099]
Furthermore, the total burner heating amount (Q large) when hot water supply and reheating are performed simultaneously. _max ~ Q small _min ) Of the hot water supply heat exchanger 8 and the reheating heat exchanger 7 and the first differential temperature (ΔT) ₁ )) Is stored in the data memory 54, so that the amount of heat (Q that is actually used for heating hot water on the reheating heat exchanger 7 side). _F ) Can be calculated by the following equation (16).
[0100]
[Expression 16]

[0101]
Further, in the present embodiment, the burner using gas as fuel is shown as the heating means of the present invention, but a burner using kerosene as fuel may be used, and heat exchange may be performed using 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.
FIG. 3 is a graph showing the correlation for determining the ratio of the amount of heat used for heating the hot water supply pipe to the total amount of heating by the burner.
[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 supply 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 (6)

A hot water supply line for supplying hot water by heating water supplied from the water supply, and hot water flowing through the hot water supply pipe, in which hot water of a predetermined flow rate is circulated to replenish the bath A reheating heat exchanger that heats the water flowing through the hot water supply pipe, a portion of which overlaps with the reheating heat exchanger, the reheating heat exchanger, and the hot water heat When the heating means for heating the exchanger, the heating amount adjusting means for adjusting the heating amount of the heating means, and the reheating and hot water supply are executed simultaneously, the hot water supply pipe line is used for heating the heating amount. A hot water supply heat amount distribution ratio grasping means for grasping a hot water supply heat amount distribution ratio, which is a ratio of the amount of heat generated, and a heating means required for supplying hot water at a predetermined temperature from the hot water supply pipe according to the hot water supply heat amount distribution ratio. Through the heating amount adjusting means so as to obtain the heating amount. In the hot water heater with reheating provided with the hot water supply control means for controlling the heating amount of the heating means, reheating water temperature detection for detecting the temperature of hot water supplied from the reheating pipeline to the reheating heat exchanger. Means, hot water supply temperature detecting means for detecting the temperature of hot water supplied from the hot water supply heat exchanger to the hot water supply line, and setting the heating amount of the heating means to a predetermined heating amount , A first difference that is a difference between the temperature of hot water supplied from the reheating pipe line to the reheating heat exchanger and the temperature of hot water supplied from the hot water supply heat exchanger to the hot water supply pipe when executed. Storage means for storing correlation data indicating a correlation between a temperature and the hot water supply heat amount distribution ratio, and the hot water supply heat amount distribution ratio grasping means is detected by the additional water temperature detection means and the hot water temperature detection. Temperature difference from the detected temperature of the means There the applied to the correlation data of the second differential temperature as the first differential temperature, the second differential temperature and reheating with water heater and calculates the hot-water supply heat distribution ratio at the predetermined heating amount . A hot water supply line for supplying hot water by heating water supplied from the water supply, and hot water flowing through the hot water supply pipe, in which hot water of a predetermined flow rate is circulated to replenish the bath A reheating heat exchanger that heats the water flowing through the hot water supply pipe, a portion of which overlaps with the reheating heat exchanger, the reheating heat exchanger, and the hot water heat When the heating means for heating the exchanger, the heating amount adjusting means for adjusting the heating amount of the heating means, and the reheating and hot water supply are executed simultaneously, the hot water supply pipe line is used for heating the heating amount. A hot water supply heat amount distribution ratio grasping means for grasping a hot water supply heat amount distribution ratio, which is a ratio of the amount of heat generated, and a heating means required for supplying hot water at a predetermined temperature from the hot water supply pipe according to the hot water supply heat amount distribution ratio. Through the heating amount adjusting means so as to obtain the heating amount. In reheating with water heater and a hot water supply control means for controlling the heating amount of the serial heating means,
Reheating water temperature detection means for detecting the temperature of hot water supplied from the reheating pipeline to the reheating heat exchanger;
When the heating amount of the heating means is set to a predetermined heating amount and reheating and hot water supply are performed simultaneously, the temperature of hot water supplied from the reheating pipeline to the reheating heat exchanger and the hot water supply heat exchange A storage means for storing correlation data indicating a correlation between a first differential temperature that is a difference between the temperature of hot water supplied to the hot water supply pipe from a water heater and the hot water supply heat quantity distribution ratio;
The hot water supply heat quantity distribution ratio grasping means applies a second difference temperature, which is a temperature difference between the detected temperature of the additional water temperature detection means and the predetermined temperature, as the first difference temperature to the correlation data, and A hot water heater with reheating, wherein the hot water supply heat amount distribution ratio at the second differential temperature and the predetermined heating amount is calculated. The storage unit stores the correlation data individually for a plurality of types of the predetermined heating amounts,
The hot water supply heat amount distribution ratio grasping means obtains the second differential temperature from the plurality of correlation data stored in the storage means according to the heating amount of the heating means determined by the hot water supply control means. 3. The hot water heater with reheating according to claim 1 or 2, wherein correlation data to be applied is selected. When the heating amount of the heating unit determined by the hot water supply control unit does not coincide with any of the plurality of predetermined heating amounts, the hot water distribution ratio grasping unit is configured to respond to the predetermined heating amount larger than the heating amount. Hot water supply heat amount distribution ratio calculated by applying the second differential temperature to the correlation data and the hot water supply calculated by applying the second differential temperature to the correlation data according to a predetermined heating amount smaller than the heating amount The hot water heater with reheating according to claim 3, wherein the hot water supply heat amount distribution ratio at the second differential temperature difference and the heating amount is calculated based on a heat amount distribution ratio. The plurality of predetermined heating amounts stored in the storage unit include a maximum heating amount and a minimum heating amount of the heating unit that can be adjusted by the heating amount adjusting unit. Or the hot water heater with a reed of Claim 4. A circulation flow rate selection means for selecting the predetermined flow rate from a plurality of types of flow rates,
The storage unit stores the correlation data individually for the plurality of types of flow rates,
The hot water supply heat amount distribution ratio grasping means applies the second differential temperature to the correlation data corresponding to the flow rate selected by the circulation flow rate selection means, and distributes the hot water supply heat amount distribution at the second differential temperature and the flow rate. The ratio is calculated, The hot water heater with a renewal of any one of Claims 1-5 characterized by the above-mentioned.

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