JP3912241B2 - Hot water storage water heater - Google Patents

Hot water storage water heater Download PDF

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JP3912241B2
JP3912241B2 JP2002274521A JP2002274521A JP3912241B2 JP 3912241 B2 JP3912241 B2 JP 3912241B2 JP 2002274521 A JP2002274521 A JP 2002274521A JP 2002274521 A JP2002274521 A JP 2002274521A JP 3912241 B2 JP3912241 B2 JP 3912241B2
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hot water
external liquid
temperature
circulating
water storage
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JP2004108718A (en
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興隆 渡邊
康一 堀越
圭 柳本
真史 田村
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Description

【０００１】
【発明の属する技術分野】
本発明は、貯湯タンク外部で、貯湯水と外部液体との間で熱交換する貯湯式給湯器に関するものである。
【０００２】
【従来の技術】
従来の浴槽追焚き機能を備えた貯湯式給湯器においては、浴槽の追焚き時に、循環ポンプを運転して貯湯タンクの上部より循環回路に高温水を取り出し、熱交換器で浴槽水と熱交換させ、浴槽水の温度を検出しながら浴槽水の追焚きを行っている。（例えば、特許文献１参照）。
【０００３】
【特許文献１】
特開２００１−１０８２９２号公報
【０００４】
【発明が解決しようとする課題】
しかしながら、上記のような従来の構成では、浴槽水温度を検出する温度センサが故障した場合には、追焚き加熱の制御ができなくなり、浴槽水の温度が設定温度に到達しても追焚き運転が停止せず、浴槽水の温度が設定温度よりも上昇してしまうという課題がある。
【０００５】
本発明は、上記のような問題点を解消するためになされたもので、外部液体との熱交換運転の開始時に温度センサの異常の有無を判定して、無駄がなく、確実に正常な熱交換運転ができる貯湯式給湯器を提供することを目的とする。
【０００６】
【課題を解決するための手段】
本発明に係る貯湯式給湯器は、下部から給水され、上部から出湯される貯湯タンクと、この貯湯タンクの上部から取り出した貯湯水を前記貯湯タンクへ戻す貯湯水循環回路と、この貯湯水循環回路に貯湯タンクから取り出した貯湯水を循環させる循環ポンプと、外部液体を循環する外部液体循環回路と、前記貯湯水循環回路を循環する貯湯水と前記外部液体循環回路を循環する外部液体との間で熱交換する熱交換器と、前記外部液体循環回路に外部液体を循環させる循環ポンプと、前記熱交換器の入口側と出口側の外部液体の温度を検出する温度検出手段と、給湯器の運転を制御する制御部とを備えた貯湯式給湯器において、
前記貯湯水循環回路に循環流量を調整する循環流量調整弁を設け、前記制御部は、前記貯湯水と外部液体との熱交換運転の開始時に、前記循環流量調整弁を全閉にして前記外部液体循環回路の循環ポンプを所定時間運転し、前記温度検出手段で検出した熱交換器の入口側と出口側の外部液体の温度差に基づいて前記温度検出手段の異常の有無を判定し、その判定結果により前記貯湯水と外部液体との熱交換運転の継続又は禁止を行うものである。
【０００７】
【発明の実施の形態】
実施の形態１．
図１は本発明の実施の形態１を示す貯湯式給湯器の構成図であり、図２は浴槽追焚き制御のフローチャートである。
図１において、給湯器本体１内に貯湯タンク２が配設され、貯湯水を加熱する発熱体４が貯湯タンク２に取付けてある。この貯湯タンク２の下部には給水管３が接続されている。この給水管３に減圧弁３ａが設けられ、前記貯湯タンク２の上部に給湯管５が接続されている。この給湯管５に逃し弁５ａが設けられ、貯湯タンク２の上下部で貯湯水循環回路６が接続されている。この貯湯水循環回路６は貯湯タンク２内に貯湯されたお湯と浴槽１０（外部熱負荷）内のお湯を熱交換する熱交換器７、貯湯タンク２内のお湯を貯湯水循環回路６に循環させる循環ポンプ８、貯湯水循環回路６を通るお湯の循環流量を調整する循環流量調整弁９で構成されている。浴槽１０には浴槽水（外部液体）循環回路１１が接続され、この浴槽水循環回路１１は浴槽水往き循環回路１１ａと浴槽水を循環させる循環ポンプ１２と前記熱交換器７と浴槽水戻り循環回路１１ｂで構成されている。
【０００８】
貯湯タンク２の外側面には内部の湯の温度を検出する温度センサ１４ａ，１４ｂが所定間隔を有して取り付けられている。貯湯水循環回路６には熱交換器７への貯湯水の入口温度を検出する温度センサ１５ａと熱交換器７からの貯湯水の出口温度を検出する温度センサ１５ｂが取り付けられている。また、浴槽水循環回路１１には熱交換器７への浴槽水の入口温度を検出する温度センサ１５ｃと熱交換器７からの浴槽水の出口温度を検出する温度センサ１５ｄが取り付けられている。制御部５０は前記各温度センサ１４ａ，１４ｂ，１５ａ，１５ｂ，１５ｃ，１５ｄの検出値を読込み、操作部６０の設定に基づいて発熱体４，循環ポンプ８，１２、循環流量調整弁９を制御し，給湯器の運転を制御する。
【０００９】
ここで、循環流量調整弁９の調節次第で、貯湯水循環回路６の循環量は増減し、浴槽１０を加熱する加熱能力が変化する。循環流量調整弁９が全開時は加熱能力が最大で、貯湯水循環回路６の循環量を少なくした場合、加熱能力は低下するが、浴槽１０に戻る湯温も低くできる。
【００１０】
次に、本実施の形態１における貯湯式給湯器の動作について説明する。
給湯器本体１に電源が投入されるまでは、循環流量調整弁９は全開になっており、給水管３から給水された水は所定圧に減圧弁３で減圧され貯湯タンク２に給水され、貯湯タンク２と貯湯水循環回路６に水が満たされる。
【００１１】
給湯器本体１に電源が投入されると、貯湯タンク２に取付けてある発熱体４で貯湯水を操作部６０で設定された温度（例えば９０℃）まで沸き上げる。沸き上げ温度は貯湯タンク２に取付けてある温度センサ１４ａ，１４ｂで検出する。
この時、沸き上げ開始直後、又は、沸き上げを開始してから所定時間（例えば１時間）経過後、又は、温度センサ１４ａ、１４ｂで所定温度（例えば４５℃）を検出後に循環流量調整弁９を全閉にしても貯湯タンク２と貯湯水循環回路６に水が満たされているので、第１回目の追焚き運転は正常にできる。
【００１２】
以降、循環流量調整弁９が全閉されているので、貯湯水循環回路６は遮断され、貯湯タンク２の湯が貯湯水循環回路６に対流しないので、熱交換器７が熱くならずに、浴槽水の追焚き運転開始時に浴槽１０に熱い湯は出ない。
なお、沸き上げ時の貯湯タンク２の膨張水は逃し弁５ａより排出される。
また、一般の蛇口などに給湯する場合は、蛇口を開くことによって、給湯管５を通して水源水圧の力で給湯され、給水管３より貯湯タンク２下部に水が供給される。
【００１３】
次に、実施の形態１における浴槽水の追焚き制御動作について、図２のフローチャートを用いて説明する。
ここで、以下の説明の為、熱交換器７の貯湯水入口側の温度センサ１５ａの検出温度である入力値をＴｈｉ、貯湯水出口側の温度センサ１５ｂの検出温度である入力値をＴｈｏ、浴槽水入口側の温度センサ１５ｃの検出温度である入力値をＴｃｉ、浴槽水出口側の温度センサ１５ｄの検出温度である入力値をＴｃｏと定義する。
【００１４】
貯湯タンク２内の貯湯水が所定温度（例えば９０℃）に沸き上がり、操作部６０の操作により追焚き制御が開始されるが、この時、循環流量調整弁９が全閉されているので、貯湯水循環回路６は遮断され、貯湯タンク２の湯が貯湯水循環回路６に対流しないので、熱交換器７が熱くならず、給湯器本体１内の温度（例えば４０℃）とほぼ同じ温度になっている。
【００１５】
図２において、操作部６０の操作により追焚き制御が開始されると（Ｓ１）、まず、循環ポンプ１２が運転されて浴槽１０内のお湯が浴槽水循環回路１１に導かれ、熱交換器７を通って浴槽１０内に戻される（Ｓ２）。循環ポンプ１２を動作させて所定時間（例えば６０秒）経過後（Ｓ３）、浴槽水入口側の温度センサ１５ｃの検出温度である入力値Ｔｃｉと浴槽水出口側の温度センサ１５ｄの検出温度である入力値Ｔｃｏとの差を比較する（Ｓ４）。熱交換器７は給湯器本体１内温度（例えば４０℃）になっているので、ＴｃｉとＴｃｏは浴槽水温度になり、浴槽水入口側の温度センサ１５ｃと浴槽水出口側の温度センサ１５ｄが正常品であれば、ＴｃｉとＴｃｏで温度差はほとんどない。
【００１６】
したがって、ＴｃｉとＴｃｏの温度差が所定温度（例えば１０℃）以内かどうかを比較し（Ｓ４）、ＴｃｉとＴｃｏの温度差が所定温度（例えば１０℃）以内であれば、温度センサ１５ｃ，１５ｄはともに正常であると判定し（Ｓ５）、追焚き加熱動作を継続する。ＴｃｉとＴｃｏの温度差が所定温度（例えば１０℃）以上であれば、浴槽水入口側の温度センサ１５ｃか、又は浴槽水出口側の温度センサ１５ｄのいずれかに異常（不具合を起こしている）ありと判定し（Ｓ１０）、以降の追焚き加熱動作を禁止する。（Ｓ１１）
【００１７】
ステップＳ５で、浴槽水入口側の温度センサ１５ｃと浴槽水出口側の温度センサ１５ｄが正常と判定したときは、循環流量調整弁９は全閉から全開に切り換えられ、循環ポンプ８も運転を開始して、貯湯タンク２の上部より高温の貯湯水が貯湯水循環回路６に導かれ、熱交換器７を通って貯湯タンク２の下部に戻され、追焚き加熱動作を開始する（Ｓ６）。この時、熱交換器７は、貯湯タンク２内に貯湯された高温の貯湯水から低温の浴槽水に熱交換（伝熱）することで、浴槽水を入浴に適した温度に加熱昇温させることができる。
【００１８】
ここで、熱交換器７の近傍には、貯湯水入口側の温度センサ１５ａ、貯湯水出口側の温度センサ１５ｂ、浴槽水入口側の温度センサ１５ｃ、浴槽水出口側の温度センサ１５ｄが設けており、これらの温度センサで各部分の温度を検出し、この温度に基いて制御部５０が循環流量調整弁９を調整して追焚き加熱が行なわれる。
【００１９】
次に、浴槽水入口側の温度センサ１５ｃの入力値Ｔｃｉが操作部６０などであらかじめ設定されている浴槽水設定温度以上か否かを確認する（Ｓ７）。Ｔｃｉが設定温度以上ならば、循環ポンプ８をＯＦＦ、循環流量調整弁９を全閉にし、循環ポンプ１２をＯＦＦにして、浴槽１０内の追焚き加熱動作を停止し（Ｓ８）、追焚き制御を終了する（Ｓ９）。Ｔｃｉが設定温度未満ならば、追焚きを継続する。
【００２０】
このように、実施の形態１によれば、浴槽水の追焚き開始時に、貯湯水循環回路６の循環流量調整弁９を全閉にし、浴槽水循環回路１１の循環ポンプ１２を所定時間（６０秒）運転した後の浴槽水入口側の温度センサ１５ｃと浴槽水出口側の温度センサ１５ｄの検出温度の差に基づいて、温度センサ１５ｃ，１５ｄの異常の有無を判定し、追焚き動作の継続、禁止を行うので、確実に正常な追焚き運転ができる。
【００２１】
【発明の効果】
以上のように、本発明に係る貯湯式給湯器によれば、下部から給水され、上部から出湯される貯湯タンクと、この貯湯タンクの上部から取り出した貯湯水を前記貯湯タンクへ戻す貯湯水循環回路と、この貯湯水循環回路に貯湯タンクから取り出した貯湯水を循環させる循環ポンプと、外部液体を循環する外部液体循環回路と、前記貯湯水循環回路を循環する貯湯水と前記外部液体循環回路を循環する外部液体との間で熱交換する熱交換器と、前記外部液体循環回路に外部液体を循環させる循環ポンプと、前記熱交換器の入口側と出口側の外部液体の温度を検出する温度検出手段と、給湯器の運転を制御する制御部とを備えた貯湯式給湯器において、
前記貯湯水循環回路に循環流量を調整する循環流量調整弁を設け、前記制御部は、前記貯湯水と外部液体との熱交換運転の開始時に、前記循環流量調整弁を全閉にして前記外部液体循環回路の循環ポンプを所定時間運転し、前記温度検出手段で検出した熱交換器の入口側と出口側の外部液体の温度差に基づいて前記温度検出手段の異常の有無を判定し、その判定結果により前記貯湯水と外部液体との熱交換運転の継続又は禁止を行うので、無駄がなく、確実に正常な熱交換運転ができる。
【図面の簡単な説明】
【図１】 本発明の実施の形態１を示す貯湯式給湯器の構成図である。
【図２】 本発明の実施の形態１を示す貯湯式給湯器の追焚き制御のフローチャートである。
【符号の説明】
１ 給湯器本体
２ 貯湯タンク
６ 貯湯水循環回路
７ 熱交換器
８ 循環ポンプ
９ 循環流量調整弁
１０ 浴槽（外部熱負荷）
１１ 浴槽水（外部液体）循環回路
１２ 循環ポンプ
１５ｃ 浴槽水（外部液体）入口側の温度センサ
１５ｄ 浴槽水（外部液体）出口側の温度センサ
５０ 制御部
６０ 操作部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hot water storage type water heater that performs heat exchange between hot water and an external liquid outside a hot water storage tank.
[0002]
[Prior art]
In conventional hot water storage water heaters with a bathtub reheating function, when a bathtub is reheated, a circulating pump is operated to extract hot water from the upper part of the hot water tank into the circulation circuit and heat exchange with the bathtub water. The bath water is replenished while detecting the temperature of the bath water. (For example, refer to Patent Document 1).
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 2001-108292
[Problems to be solved by the invention]
However, in the conventional configuration as described above, when the temperature sensor for detecting the bath water temperature fails, the additional heating cannot be controlled, and the additional operation is performed even when the bath water temperature reaches the set temperature. Does not stop, and there is a problem that the temperature of the bath water rises above the set temperature.
[0005]
The present invention has been made to solve the above-described problems. At the start of the heat exchange operation with the external liquid, the presence or absence of an abnormality of the temperature sensor is determined, and there is no waste and surely normal heat It aims at providing the hot water storage type hot water heater which can be replaced .
[0006]
[Means for Solving the Problems]
A hot water storage type water heater according to the present invention includes a hot water storage tank that is supplied with water from the lower part and discharged from the upper part, a hot water circulation circuit that returns hot water extracted from the upper part of the hot water storage tank, and the hot water storage circuit. a circulation pump for circulating the hot water taken out from the hot water storage tank, heat between the external liquid circulation circuit for circulating the external fluid, the external liquid circulating the external liquid circulation circuit and hot water circulating the reserved hot water circulation circuit a heat exchanger for exchanging, a circulation pump for circulating the external liquid to the external liquid circulation circuit, a temperature detection means for detecting the inlet side and the outlet side of the temperature of the external fluid of the heat exchanger, the operation of the water heater In a hot water storage type water heater provided with a control unit to control,
A circulating flow rate adjusting valve for adjusting a circulating flow rate is provided in the hot water circulating circuit, and the control unit fully closes the circulating flow rate adjusting valve and starts the external liquid at the start of heat exchange operation between the hot water and the external liquid. The circulation pump of the circulation circuit is operated for a predetermined time , and the presence or absence of abnormality of the temperature detection means is determined based on the temperature difference between the external liquid on the inlet side and the outlet side of the heat exchanger detected by the temperature detection means, and the determination As a result , the heat exchange operation between the hot water and the external liquid is continued or prohibited .
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1 FIG.
FIG. 1 is a configuration diagram of a hot water storage type hot water heater showing Embodiment 1 of the present invention, and FIG. 2 is a flowchart of bathtub reheating control.
In FIG. 1, a hot water storage tank 2 is disposed in a water heater main body 1, and a heating element 4 for heating the hot water storage is attached to the hot water storage tank 2. A water supply pipe 3 is connected to the lower part of the hot water storage tank 2. A pressure reducing valve 3 a is provided in the water supply pipe 3, and a hot water supply pipe 5 is connected to the upper part of the hot water storage tank 2. A relief valve 5 a is provided in the hot water supply pipe 5, and a hot water storage water circulation circuit 6 is connected to the upper and lower parts of the hot water storage tank 2. This hot water circulation circuit 6 is a heat exchanger 7 for exchanging heat between hot water stored in the hot water tank 2 and hot water in the bathtub 10 (external heat load), and circulation for circulating hot water in the hot water tank 2 to the hot water circulation circuit 6. It comprises a circulating flow rate adjusting valve 9 that adjusts the circulating flow rate of hot water passing through the pump 8 and the hot water storage circuit 6. A bathtub water (external liquid) circulation circuit 11 is connected to the bathtub 10, and this bathtub water circulation circuit 11 is a bathtub water flow circulation circuit 11 a, a circulation pump 12 that circulates bathtub water, the heat exchanger 7, and a bathtub water return circulation circuit. 11b.
[0008]
Temperature sensors 14a and 14b for detecting the temperature of hot water inside are attached to the outer surface of the hot water storage tank 2 with a predetermined interval. The hot water circulating circuit 6 is provided with a temperature sensor 15 a for detecting the inlet temperature of the hot water to the heat exchanger 7 and a temperature sensor 15 b for detecting the outlet temperature of the hot water from the heat exchanger 7. The bathtub water circulation circuit 11 is provided with a temperature sensor 15 c that detects the inlet temperature of the bathtub water to the heat exchanger 7 and a temperature sensor 15 d that detects the outlet temperature of the bathtub water from the heat exchanger 7. The control unit 50 reads the detection values of the temperature sensors 14a, 14b, 15a, 15b, 15c, and 15d, and controls the heating element 4, the circulation pumps 8 and 12, and the circulation flow rate adjustment valve 9 based on the setting of the operation unit 60. And control the operation of the water heater.
[0009]
Here, depending on the adjustment of the circulation flow rate adjustment valve 9, the circulation amount of the hot water circulation circuit 6 increases and decreases, and the heating capacity for heating the bathtub 10 changes. When the circulation flow rate adjusting valve 9 is fully opened, the heating capacity is maximum, and when the circulation amount of the hot water storage circuit 6 is reduced, the heating capacity is lowered, but the hot water temperature returning to the bathtub 10 can be lowered.
[0010]
Next, the operation of the hot water storage type water heater in the first embodiment will be described.
Until the water heater body 1 is turned on, the circulation flow rate adjusting valve 9 is fully opened, and the water supplied from the water supply pipe 3 is reduced to a predetermined pressure by the pressure reducing valve 3 and supplied to the hot water storage tank 2. The hot water tank 2 and the hot water circulation circuit 6 are filled with water.
[0011]
When power is supplied to the water heater main body 1, the hot water stored in the hot water storage tank 2 is heated to a temperature set by the operation unit 60 (for example, 90 ° C.). The boiling temperature is detected by temperature sensors 14 a and 14 b attached to the hot water storage tank 2.
At this time, the circulation flow rate adjusting valve 9 immediately after the start of boiling, after the elapse of a predetermined time (for example, 1 hour) after the start of boiling, or after the predetermined temperature (for example, 45 ° C.) is detected by the temperature sensors 14a and 14b. Since the hot water storage tank 2 and the hot water circulation circuit 6 are filled with water even if is fully closed, the first chasing operation can be performed normally.
[0012]
Thereafter, since the circulation flow rate adjusting valve 9 is fully closed, the hot water circulation circuit 6 is shut off, and the hot water in the hot water storage tank 2 does not convect to the hot water circulation circuit 6, so that the heat exchanger 7 does not become hot and bath water No hot water comes out of the bathtub 10 at the start of the chasing operation.
In addition, the expansion water of the hot water storage tank 2 at the time of boiling is discharged | emitted from the relief valve 5a.
In addition, when hot water is supplied to a general faucet or the like, hot water is supplied through the hot water supply pipe 5 by the water source water pressure by opening the faucet, and water is supplied from the water supply pipe 3 to the lower part of the hot water storage tank 2.
[0013]
Next, the bath water replenishment control operation in the first embodiment will be described with reference to the flowchart of FIG.
Here, for the following explanation, the input value which is the detected temperature of the temperature sensor 15a on the hot water inlet side of the heat exchanger 7 is Thi, and the input value which is the detected temperature of the temperature sensor 15b on the hot water outlet side is Th, The input value that is the detected temperature of the temperature sensor 15c on the bathtub water inlet side is defined as Tci, and the input value that is the detected temperature of the temperature sensor 15d on the bathtub water outlet side is defined as Tco.
[0014]
The stored hot water in the hot water storage tank 2 is heated to a predetermined temperature (for example, 90 ° C.), and the reheating control is started by operating the operation unit 60. At this time, the circulation flow rate adjusting valve 9 is fully closed. The hot-water storage circuit 6 is shut off and the hot water in the hot-water storage tank 2 does not convect to the hot-water storage circuit 6, so the heat exchanger 7 does not heat up and becomes almost the same temperature as the temperature in the water heater body 1 (for example, 40 ° C.). ing.
[0015]
In FIG. 2, when the chasing control is started by the operation of the operation unit 60 (S1), first, the circulation pump 12 is operated and the hot water in the bathtub 10 is guided to the bathtub water circulation circuit 11, and the heat exchanger 7 is turned on. It passes through and returns to the bathtub 10 (S2). After a predetermined time (for example, 60 seconds) has elapsed after the circulation pump 12 is operated (S3), the input value Tci which is the detected temperature of the temperature sensor 15c on the bathtub water inlet side and the detected temperature of the temperature sensor 15d on the bathtub water outlet side The difference with the input value Tco is compared (S4). Since the heat exchanger 7 has a temperature in the water heater main body 1 (for example, 40 ° C.), Tci and Tco become the bath water temperature, and the temperature sensor 15c on the bath water inlet side and the temperature sensor 15d on the bath water outlet side If it is a normal product, there is almost no temperature difference between Tci and Tco.
[0016]
Therefore, it is compared whether the temperature difference between Tci and Tco is within a predetermined temperature (for example, 10 ° C.) (S4). If the temperature difference between Tci and Tco is within the predetermined temperature (for example, 10 ° C.), temperature sensors 15c and 15d are detected. Are determined to be normal (S5), and the chasing heating operation is continued. If the temperature difference between Tci and Tco is equal to or higher than a predetermined temperature (for example, 10 ° C.), either the temperature sensor 15c on the bathtub water inlet side or the temperature sensor 15d on the bathtub water outlet side is abnormal (has a problem). It is determined that there is (S10), and the subsequent heating operation is prohibited. (S11)
[0017]
In step S5, when it is determined that the temperature sensor 15c on the bathtub water inlet side and the temperature sensor 15d on the bathtub water outlet side are normal, the circulation flow rate adjusting valve 9 is switched from fully closed to fully opened, and the circulation pump 8 also starts operation. Then, hot hot water having a high temperature is led to the hot water circulation circuit 6 from the upper part of the hot water storage tank 2 and is returned to the lower part of the hot water storage tank 2 through the heat exchanger 7 to start a reheating operation (S6). At this time, the heat exchanger 7 heats and heats the bath water to a temperature suitable for bathing by exchanging heat from the hot hot water stored in the hot water storage tank 2 to the low temperature bath water. be able to.
[0018]
Here, in the vicinity of the heat exchanger 7, a temperature sensor 15a on the hot water inlet side, a temperature sensor 15b on the hot water outlet side, a temperature sensor 15c on the bathtub water inlet side, and a temperature sensor 15d on the bathtub water outlet side are provided. The temperature of each part is detected by these temperature sensors, and the controller 50 adjusts the circulation flow rate adjusting valve 9 based on this temperature to perform additional heating.
[0019]
Next, it is confirmed whether or not the input value Tci of the temperature sensor 15c on the bath water inlet side is equal to or higher than the bath water set temperature preset in the operation unit 60 or the like (S7). If Tci is equal to or higher than the set temperature, the circulation pump 8 is turned off, the circulation flow rate adjusting valve 9 is fully closed, the circulation pump 12 is turned off, and the reheating heating operation in the bathtub 10 is stopped (S8). Is finished (S9). If Tci is less than the set temperature, the chasing is continued.
[0020]
As described above, according to the first embodiment, at the start of bath water replenishment, the circulation flow rate adjusting valve 9 of the hot water circulation circuit 6 is fully closed, and the circulation pump 12 of the bathtub water circulation circuit 11 is set for a predetermined time (60 seconds). Based on the difference in temperature detected between the temperature sensor 15c on the bathtub water inlet side and the temperature sensor 15d on the bathtub water outlet side after operation, the presence or absence of abnormality of the temperature sensors 15c and 15d is determined, and the chasing operation is continued or prohibited. Therefore, normal chasing operation can be surely performed.
[0021]
【The invention's effect】
As described above, according to the hot water storage type water heater of the present invention, a hot water storage tank that is supplied with water from the lower part and discharged from the upper part, and a hot water circulation circuit that returns the hot water taken out from the upper part of the hot water storage tank to the hot water storage tank. A circulating pump that circulates the hot water taken out from the hot water tank through the hot water circulating circuit, an external liquid circulating circuit that circulates external liquid, and hot water that circulates through the hot water circulating circuit and the external liquid circulating circuit. a heat exchanger for exchanging heat with an external fluid, said external fluid circulation pump for circulating the external liquid circulation circuit, a temperature detection means for detecting the inlet side and the outlet side of the temperature of the external fluid of the heat exchanger And a hot water storage type water heater provided with a controller for controlling the operation of the water heater,
A circulating flow rate adjusting valve for adjusting a circulating flow rate is provided in the hot water circulating circuit, and the control unit fully closes the circulating flow rate adjusting valve and starts the external liquid at the start of heat exchange operation between the hot water and the external liquid. The circulation pump of the circulation circuit is operated for a predetermined time , and the presence or absence of abnormality of the temperature detection means is determined based on the temperature difference between the external liquid on the inlet side and the outlet side of the heat exchanger detected by the temperature detection means, and the determination since the result by performing a continuation or prohibition of the heat exchange operation with the hot water and external liquid, without waste, it is certainly normal heat exchange operation.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a configuration diagram of a hot water storage type water heater showing Embodiment 1 of the present invention.
FIG. 2 is a flowchart of the reheating control of the hot water storage type hot water heater showing Embodiment 1 of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Water heater body 2 Hot water storage tank 6 Hot water storage water circulation circuit 7 Heat exchanger 8 Circulation pump 9 Circulation flow rate adjustment valve 10 Bathtub (external heat load)
11 Bath Water (External Liquid) Circulation Circuit 12 Circulation Pump 15c Temperature Sensor 15d on Bath Water (External Liquid) Inlet Side Temperature Sensor 50 on Bath Water (External Liquid) Outlet Side Control Unit 60 Operation Unit

Claims (1)

下部から給水され、上部から出湯される貯湯タンクと、この貯湯タンクの上部から取り出した貯湯水を前記貯湯タンクへ戻す貯湯水循環回路と、この貯湯水循環回路に貯湯タンクから取り出した貯湯水を循環させる循環ポンプと、外部液体を循環する外部液体循環回路と、前記貯湯水循環回路を循環する貯湯水と前記外部液体循環回路を循環する外部液体との間で熱交換する熱交換器と、前記外部液体循環回路に外部液体を循環させる循環ポンプと、前記熱交換器の入口側と出口側の外部液体の温度を検出する温度検出手段と、給湯器の運転を制御する制御部とを備えた貯湯式給湯器において、
前記貯湯水循環回路に循環流量を調整する循環流量調整弁を設け、前記制御部は、前記貯湯水と外部液体との熱交換運転の開始時に、前記循環流量調整弁を全閉にして前記外部液体循環回路の循環ポンプを所定時間運転し、前記温度検出手段で検出した熱交換器の入口側と出口側の外部液体の温度差に基づいて前記温度検出手段の異常の有無を判定し、その判定結果により前記貯湯水と外部液体との熱交換運転の継続又は禁止を行うことを特徴とする貯湯式給湯器。A hot water storage tank supplied with water from the lower part and discharged from the upper part, a hot water circulation circuit for returning the hot water extracted from the upper part of the hot water storage tank to the hot water storage tank, and the hot water extracted from the hot water storage tank are circulated in the hot water circulation circuit a circulation pump, an external liquid circulation circuit for circulating the external fluid, a heat exchanger for exchanging heat with an external liquid circulating the external liquid circulation circuit and hot water circulating the reserved hot water circulation circuit, the external liquid A hot water storage system comprising a circulation pump for circulating an external liquid in a circulation circuit, temperature detection means for detecting the temperature of the external liquid on the inlet side and the outlet side of the heat exchanger, and a control unit for controlling the operation of the water heater. In the water heater,
A circulating flow rate adjusting valve for adjusting a circulating flow rate is provided in the hot water circulating circuit, and the control unit fully closes the circulating flow rate adjusting valve and starts the external liquid at the start of heat exchange operation between the hot water and the external liquid. The circulation pump of the circulation circuit is operated for a predetermined time , and the presence or absence of abnormality of the temperature detection means is determined based on the temperature difference between the external liquid on the inlet side and the outlet side of the heat exchanger detected by the temperature detection means, and the determination According to the result, the hot water storage type water heater is characterized in that the heat exchange operation between the hot water and the external liquid is continued or prohibited .
JP2002274521A 2002-09-20 2002-09-20 Hot water storage water heater Expired - Lifetime JP3912241B2 (en)

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JP4633557B2 (en) * 2005-06-30 2011-02-16 株式会社キューヘン Reheating device using hot water heater
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