JP2005069625A - Reservoir type hot water supply system - Google Patents

Reservoir type hot water supply system Download PDF

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JP2005069625A
JP2005069625A JP2003302824A JP2003302824A JP2005069625A JP 2005069625 A JP2005069625 A JP 2005069625A JP 2003302824 A JP2003302824 A JP 2003302824A JP 2003302824 A JP2003302824 A JP 2003302824A JP 2005069625 A JP2005069625 A JP 2005069625A
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hot water
water supply
temperature
valve
storage tank
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JP4052206B2 (en
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Shiro Kazama
史郎 風間
Koryu Watanabe
興隆 渡邊
So Hiraoka
宗 平岡
Yoshihiro Furukawa
芳洋 古川
Shinichi Tomota
伸一 友田
Tetsuya Matsuyama
哲也 松山
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a reservoir type hot water supply system capable of preventing high-temperature water from unexpectedly being supplied and preventing heating efficiency (performance coefficient) during boiling from lowering in a heating method using a heat pump cycle. <P>SOLUTION: This hot water supply system comprises a first hot water supply pipe 5 for supplying hot water from the upper part of a hot water reservoir tank 1, one or more hot water supply pipes 20 for supplying hot water from the middle part of the hot water reservoir tank, a first mixing valve 19 for mixing the hot water supplied from the first hot water supply pipe 5 and the hot water supplied from the second hot water supply pipes 20, a second mixing valve 22 for mixing the hot water from the first mixing valve 19 and city water to generate hot water having a desired temperature, an opening and closing valve 24 provided at a downstream of the second mixing valve 22 to supply and stop supplying the generated hot water, and a control device 30 for controlling entire behavior of the hot water supply system entirely including the mixing valves 19, 22 and the opening and closing valve 24. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、貯湯タンクを有する貯湯式給湯システムに関するものであり、さらに詳しくは該貯湯タンク内の湯水を熱源として外部負荷と熱交換を行なう機能を備えた貯湯式給湯システムに関するものである。   The present invention relates to a hot water storage hot water supply system having a hot water storage tank, and more particularly to a hot water storage hot water supply system having a function of exchanging heat with an external load using hot water in the hot water storage tank as a heat source.

従来の貯湯式給湯システムにおいては、貯湯タンク内の高温水または中温水を該貯湯タンクの上部または中ほどから取り出し、市水と混合して給湯に利用する構成である（例えば、特許文献１、２参照）。   In the conventional hot water storage type hot water supply system, the hot water or medium temperature water in the hot water storage tank is taken out from the upper part or middle of the hot water storage tank and mixed with city water to be used for hot water supply (for example, Patent Document 1, 2).

特開２００３−１１４０５３号公報（第２頁、図１）JP 2003-114053 A (2nd page, FIG. 1) 特開２００２−３６４９２８号公報（第２頁、図１）JP 2002-364928 (second page, FIG. 1)

しかしながら、上記特許文献１，２に示された従来の構成では、生成された中温水を出湯する際、所望温度により貯湯タンクからの出湯位置を選択する機能を有しているものの、一般的に給湯（つまり蛇口やシャワー等での湯の使用）は、前記中温水の貯湯加減により決まるものではなく、使用者のニーズによって使用量やタイミングが決定されるものである。
したがって、上記特許文献１，２に示された従来の構成では、中温水を利用している最中に貯湯タンク内の中温水がなくなり、その結果、出湯中にもかかわらず、貯湯タンク上部の高温水への供給に回路を切り替える必要が生じることになった場合、供給側では急激な湯の供給温度の変動によりその後の市水との混合において、給湯される湯温の急激な変動が発生し、使用者に不快感を与えるだけでなく、高温湯の混合比率が一時的に増大することで、意図しない高温出湯のおそれがある。 However, in the conventional configurations shown in Patent Documents 1 and 2 above, when the generated medium-temperature water is discharged, it has a function of selecting a position of the hot water from the hot water storage tank according to a desired temperature. Hot water supply (that is, use of hot water in a faucet or shower) is not determined by the amount of hot water stored in the medium-temperature water, but the amount and timing of use are determined by the user's needs.
Therefore, in the conventional configuration shown in Patent Documents 1 and 2, there is no intermediate temperature water in the hot water storage tank while using the intermediate temperature water, and as a result, the hot water storage tank is in the upper part even though the hot water is being discharged. When it becomes necessary to switch the circuit to supply high-temperature water, sudden fluctuations in the supply temperature of hot water on the supply side will cause a sudden fluctuation in the temperature of hot water supplied during subsequent mixing with city water. In addition to causing discomfort to the user, there is a risk of unintended high-temperature tapping due to a temporary increase in the mixing ratio of high-temperature hot water.

また、特許文献１，２に示された従来の構成には、中温水と高温水をあらかじめ混合弁で混合してから、市水と混合する手段を有しているが、この場合も、初期状態で中温水を利用しているような比較的中低温の湯を生成している状態から、中温水がなくなって高温水を供給する側に混合弁を制御してしまうと、上述と同様に、高温湯の混合比率が一時的に増大することで、意図しない高温出湯のおそれがあり、給湯される湯の温度の変動が発生し、使用者に不快感を与えるおそれがある。さらに、高温水と中温水の混合比率を徐々に変更する手段を採用しても、蛇口等からの給湯は使用者が任意に操作するため、必ず停止することがある。この停止中は、混合弁が高温水と中温水を混ぜる位置にあるので、高温水と中温水の比重の違いにより、高温水が混合弁の高温水給湯側から中温水給湯側に廻りこむ現象が発生して、一時的に高温水同士が混合弁内に充満する状態が発生し、上述のような高温出湯のおそれがあるという問題があった。   In addition, the conventional configurations shown in Patent Documents 1 and 2 have means for mixing medium-temperature water and high-temperature water in advance with a mixing valve and then mixing with city water. When the mixing valve is controlled to the side where the hot water is supplied from the state in which the hot water at a relatively low temperature is generated such that the hot water is used in the state, the same as described above. If the mixing ratio of high-temperature hot water is temporarily increased, there is a risk of unintended high-temperature hot-water supply, and fluctuations in the temperature of hot-water supply may occur, which may cause discomfort to the user. Furthermore, even if a means for gradually changing the mixing ratio of the high temperature water and the medium temperature water is adopted, the hot water supply from the faucet or the like is always stopped because the user arbitrarily operates it. During this stop, the mixing valve is in a position to mix hot water and medium temperature water, so the phenomenon of high temperature water flowing from the high temperature water supply side to the medium temperature water supply side due to the difference in specific gravity of the high temperature water and medium temperature water. Has occurred, and there has been a problem that high temperature water temporarily fills the mixing valve and there is a risk of high temperature hot water as described above.

また、加熱手段としてヒートポンプサイクルを用いた室外機を利用して、貯湯タンクの下部より水を取り出し、室外機にて湯を作り、貯湯タンクの上部に沸き上げた湯を順次貯めていくように沸き上げを行なうヒートポンプ式の給湯システムにおいては、貯湯タンクから室外機ヘ供給される水の温度が高いと、沸き上げ時の加熱効率（成績係数）が低下してしまうという問題がある。なお、ここでいう加熱効率とは、沸き上げ能力を消費電力で割ったものをさす。   In addition, using an outdoor unit that uses a heat pump cycle as a heating means, water is taken out from the lower part of the hot water storage tank, hot water is made in the outdoor unit, and the boiling water is sequentially stored in the upper part of the hot water storage tank. In a heat pump hot water supply system that performs boiling, there is a problem that heating efficiency (coefficient of performance) during boiling decreases when the temperature of the water supplied from the hot water storage tank to the outdoor unit is high. In addition, the heating efficiency here refers to the boiling capacity divided by the power consumption.

本発明は、上記のような課題を解決するためになされたもので、意図しない高温出湯を防止し、かつ、ヒートポンプサイクルを用いた加熱方式においては、沸き上げ時の加熱効率（成績係数）の低下を防止できる貯湯式給湯システムを提供することを目的とする。   The present invention has been made to solve the above-described problems, prevents unintended high-temperature hot water, and in the heating system using a heat pump cycle, the heating efficiency (coefficient of performance) at the time of boiling is increased. It aims at providing the hot water storage type hot-water supply system which can prevent a fall.

本発明に係わる貯湯式給湯システムは、貯湯タンクを有する貯湯式給湯システムにおいて、貯湯タンクの上部から出湯する第１の給湯配管と、貯湯タンクの中ほどから出湯する１つあるいは複数の第２の給湯配管と、第１の給湯配管から出湯する第１配管水と第２の給湯配管から出湯する第２配管水との出湯を混合する第１の混合弁と、この第１の混合弁からの出湯と市水を混合して所望温度の温水を生成する第２の混合弁と、この第２の混合弁の下流に設けられて生成された温水の供給と停止を行う開閉弁と、前記各混合弁、開閉弁等給湯システム全体の動作を制御する制御装置とを有するものである。 A hot water storage type hot water supply system according to the present invention is a hot water storage type hot water supply system having a hot water storage tank, a first hot water supply pipe for discharging hot water from an upper part of the hot water storage tank, and one or a plurality of second hot water discharged from the middle of the hot water storage tank. A hot water supply pipe, a first mixing valve that mixes the hot water of the first pipe water discharged from the first hot water supply pipe and the second pipe water discharged from the second hot water supply pipe, and the first mixing valve A second mixing valve that generates hot water having a desired temperature by mixing tapping water and city water; an on-off valve that is provided downstream of the second mixing valve and that supplies and stops the generated hot water; And a control device for controlling the operation of the entire hot water supply system such as a mixing valve and an on-off valve.

本発明による貯湯式給湯システムは、意図しない高温出湯を防止し、かつ、ヒートポンプサイクルを用いた加熱方式においては、沸き上げ時の加熱効率（成績係数）の低下を防止することが可能となる。   The hot water storage type hot water supply system according to the present invention can prevent unintended high temperature hot water supply and can prevent a reduction in heating efficiency (coefficient of performance) at the time of boiling in a heating method using a heat pump cycle.

実施の形態１．
図１は本発明の実施の形態１を示す貯湯式給湯システムの構成図である。
図１において、貯湯タンク１の下部には給水配管２が接続されていて、この給水配管２には第１，第２の給水バイパス管３，４が設けられ、また、貯湯タンク１の上部には第１の給湯配管５が接続されていて、この第１の給湯配管５には給湯バイパス管６が接続されている。
貯湯タンク１の上下部には放熱用循環回路７が接続されており、この放熱用循環回路７は、貯湯タンク１内に貯湯された湯と外部熱負荷である床暖房器８内のブラインとを熱交換する暖房用熱交換器９と、貯湯タンク１内の湯を放熱用循環回路７に循環させる循環ポンプ１０とによって構成されている。 Embodiment 1 FIG.
FIG. 1 is a configuration diagram of a hot water storage type hot water supply system showing Embodiment 1 of the present invention.
In FIG. 1, a water supply pipe 2 is connected to the lower part of the hot water storage tank 1, and the water supply pipe 2 is provided with first and second water supply bypass pipes 3, 4. A first hot water supply pipe 5 is connected to the first hot water supply pipe 5, and a hot water supply bypass pipe 6 is connected to the first hot water supply pipe 5.
A heat dissipation circulation circuit 7 is connected to the upper and lower portions of the hot water storage tank 1. The heat dissipation circulation circuit 7 includes hot water stored in the hot water storage tank 1, brine in the floor heater 8 as an external heat load, and the like. The heating heat exchanger 9 for exchanging heat and the circulation pump 10 for circulating the hot water in the hot water storage tank 1 to the circulation circuit 7 for heat radiation.

床暖房器８には暖房用熱交換器９の二次側である暖房循環回路１２が接続され、暖房循環回路１２には前記暖房用熱交換器９から床暖房器８へブラインを循環させる循環ポンプ１３が設けられている。
ヒートポンプ本体１４には貯湯タンク１の上下部と接続された加熱循環回路１５が接続されており、前記ヒートポンプ本体１４内に配置された循環ポンプ（図示せず）により貯湯タンク１の下部から水を導き、ヒートポンプ本体１４内で外気との熱交換を行い、水を高温の湯に沸き上げ、貯湯タンク１の上部に戻している。加熱循環回路１５の貯湯タンク１下部側には温度センサ１５ａが設けられている。 A heating circulation circuit 12 that is a secondary side of the heating heat exchanger 9 is connected to the floor heater 8, and the heating circulation circuit 12 circulates the brine from the heating heat exchanger 9 to the floor heater 8. A pump 13 is provided.
A heat circulation circuit 15 connected to the upper and lower parts of the hot water storage tank 1 is connected to the heat pump main body 14, and water is supplied from the lower part of the hot water storage tank 1 by a circulation pump (not shown) arranged in the heat pump main body 14. The heat is exchanged with the outside air in the heat pump main body 14, the water is boiled into hot water and returned to the upper part of the hot water storage tank 1. A temperature sensor 15 a is provided on the lower side of the hot water storage tank 1 of the heating circuit 15.

給湯側混合弁１６は第１の給水バイパス管３と第１の給湯配管５の間に接続され、第１の給水バイパス管３からの市水と第１の給湯配管５から供給される高温水を混合して、一般給湯管１７を経由し、蛇口１８等の出湯口から出湯する。
第１の混合弁１９は、貯湯タンク１の中ほどと接続された第２の給湯配管２０と第１の給湯配管５から分岐した給湯バイパス管６の間に接続され、貯湯タンク１の上部に接続された第１の給湯配管５から供給される高温水と貯湯タンク１の中ほどと接続された第２の給湯配管２０から供給される中温水とを混合して第２の混合弁２２に供給する。
温度センサ１１は、第１の混合弁１９と第２の混合弁２２の間に設置されて、第１の混合弁１９の出湯湯温を検出する。また、温度センサ２１は貯湯タンク１の側面中ほどに設置されていて、前記第２の給湯配管２０の温水取出口付近の湯温を検出する。 The hot water supply side mixing valve 16 is connected between the first hot water supply bypass pipe 3 and the first hot water supply pipe 5, and the city water from the first hot water supply bypass pipe 3 and the high temperature water supplied from the first hot water supply pipe 5. Then, the hot water is discharged from a hot water outlet such as the faucet 18 through the general hot water supply pipe 17.
The first mixing valve 19 is connected between the second hot water supply pipe 20 connected to the middle of the hot water storage tank 1 and the hot water supply bypass pipe 6 branched from the first hot water supply pipe 5. The high temperature water supplied from the connected first hot water supply pipe 5 and the middle temperature water supplied from the second hot water supply pipe 20 connected to the middle of the hot water storage tank 1 are mixed to the second mixing valve 22. Supply.
The temperature sensor 11 is installed between the first mixing valve 19 and the second mixing valve 22 and detects the hot water temperature of the first mixing valve 19. The temperature sensor 21 is installed in the middle of the side surface of the hot water storage tank 1 and detects the hot water temperature near the hot water outlet of the second hot water supply pipe 20.

また、第２の混合弁２２は、前記第１の混合弁１９から供給される温水と第２の給水配管４から供給される市水を混合してふろ配管２５に供給する。このふろ配管２５には浴槽２６へ所望の温度に混合された温水を供給、遮断する開閉弁２４と、該ふろ配管２５を通して浴槽２６へ供給した湯量を計測する流量センサ２７が設けられている。
なお、前記第２の給湯配管２０は、貯湯タンク１の下方部からタンク１内に挿入されているが、その温水取出口は前記貯湯タンク１内で図示のように、温度センサ２１の設置位置よりやや上方まで（貯湯タンク１の中ほどまで）延設されている。また、前記第２の給湯配管２０には第１の混合弁１９の手前に位置して逆止弁２０ａを配している。操作部３１では使用者が出湯の所望温度や所望量を設定する。 The second mixing valve 22 mixes hot water supplied from the first mixing valve 19 and city water supplied from the second water supply pipe 4 and supplies the mixed water to the bath pipe 25. The bath pipe 25 is provided with an on-off valve 24 that supplies and shuts off hot water mixed at a desired temperature to the bathtub 26 and a flow rate sensor 27 that measures the amount of hot water supplied to the bathtub 26 through the bath pipe 25.
The second hot water supply pipe 20 is inserted into the tank 1 from the lower part of the hot water storage tank 1, and its hot water outlet is located in the hot water storage tank 1 as shown in FIG. It extends to a slightly higher position (up to the middle of the hot water storage tank 1). The second hot water supply pipe 20 is provided with a check valve 20a located in front of the first mixing valve 19. In the operation unit 31, the user sets a desired temperature and a desired amount of hot water.

制御装置３０は前記操作部３１で設定された所望温度や所望量及び温度センサ１１、１５ａ，２１，２３、流量センサ２７の検出値に基づいて循環ポンプ１０，１３，ヒートポンプ本体１４，給湯側混合弁１６，第１の混合弁１９，第２の混合弁２２，開閉弁２４等の動作を制御してシステム全体の運転を制御する。使用者が浴槽２６に給湯する場合、操作部３１により設定する所望温度は概ね３５〜４５℃程度である。   The control device 30 mixes the circulation pumps 10 and 13, the heat pump main body 14, and the hot water supply side based on the desired temperature and desired amount set by the operation unit 31 and the detected values of the temperature sensors 11, 15 a, 21 and 23 and the flow rate sensor 27. The operation of the entire system is controlled by controlling the operations of the valve 16, the first mixing valve 19, the second mixing valve 22, the on-off valve 24, and the like. When a user supplies hot water to the bathtub 26, the desired temperature set by the operation unit 31 is approximately 35 to 45 ° C.

次に、本実施の形態１における貯湯式給湯システムの動作について説明する。
まず、沸き上げを行う場合の動作について図１を用いて説明する。
給水配管２から給水された市水は減圧弁（図示せず）で所定圧に減圧され、貯湯タンク１に給水される。これにより、貯湯タンク１内は常に満水状態となっている。
この状態で、操作部３１により制御装置３０が沸き上げ開始の指示を受けると、貯湯タンク１内の水はヒートポンプ本体１４に内蔵の循環ポンプ（図示せず）の運転により、貯湯タンク１の下部から加熱循環回路１５に取り出されてヒートポンプ本体１４で熱交換し、設定された温度（例えば９０℃）になるように加熱昇温され、貯湯タンク１の上部に戻される（図１中、矢印ａ）。これにより、貯湯タンク１の上部より９０℃の湯が少量づつ貯湯されていく。 Next, the operation of the hot water storage type hot water supply system in the first embodiment will be described.
First, the operation when boiling is described with reference to FIG.
The city water supplied from the water supply pipe 2 is reduced to a predetermined pressure by a pressure reducing valve (not shown) and supplied to the hot water storage tank 1. Thereby, the hot water storage tank 1 is always full.
In this state, when the controller 30 receives an instruction to start boiling from the operation unit 31, the water in the hot water storage tank 1 is moved to the lower part of the hot water storage tank 1 by the operation of a circulation pump (not shown) built in the heat pump main body 14. Is taken out to the heating circuit 15 and exchanged with the heat pump main body 14, heated and heated to a set temperature (for example, 90 ° C.), and returned to the upper part of the hot water storage tank 1 (arrow a in FIG. 1). ). Thereby, 90 degreeC hot water is stored little by little from the upper part of the hot water storage tank 1.

ヒートポンプ方式による沸き上げは、温度センサ１５ａの温度が一定温度（例えば６０℃）以上になったら、制御装置３０は貯湯タンク１が全量沸き上がったと判断して、沸き上げを終了する（図２の状態）。
このとき、ヒートポンプ方式による沸き上げ加熱性能は、ヒートポンプ本体１４に入る水の温度が低いときは、沸き上げの加熱効率が高いが、入る水の温度が高いときは沸き上げの加熱効率（成績係数）は低下する特性を持っている。 In the heating by the heat pump method, when the temperature of the temperature sensor 15a becomes equal to or higher than a certain temperature (for example, 60 ° C.), the control device 30 determines that all the hot water storage tank 1 has been heated up and ends the heating (the state of FIG. 2). ).
At this time, when the temperature of the water entering the heat pump main body 14 is low, the heating efficiency of boiling is high when the temperature of the water entering the heat pump main body 14 is low. ) Has a deteriorating property.

次に、蛇口１８からの一般給湯を行う場合の動作について説明する。
この場合は、蛇口１８を開くことによって、第１の給水バイパス管３を経由し供給される市水（図１中、矢印ｆ）と貯湯タンク１を経由して第１の給湯配管５を通して供給される高温水（図１中、矢印ｅ）を給湯側混合弁１６により使用者が設定した所望温度に混合して、一般給湯配管１７を経由して給湯が行われる。（図１中、矢印ｈ） Next, the operation when performing general hot water supply from the faucet 18 will be described.
In this case, the faucet 18 is opened to supply the city water supplied through the first water supply bypass pipe 3 (arrow f in FIG. 1) and the hot water storage tank 1 through the first hot water supply pipe 5. Hot water (arrow e in FIG. 1) is mixed to a desired temperature set by the user by the hot water supply side mixing valve 16, and hot water is supplied via the general hot water supply pipe 17. (In FIG. 1, arrow h)

次に、浴槽２６へ給湯を行う湯はり動作の場合について説明する。
この場合は、操作部３１により制御装置３０が湯はり開始の指示を受けると、湯はり動作が開始される。湯はり動作が開始されると、まず、温度センサ２１により第２の給湯配管２０からの中温水取り出しが可能かどうかを検出し、中温水がある場合はそれを制御装置３０が判断して、制御装置３０が第１の混合弁１９により第２の給湯配管２０側に切り替えて（図１中、矢印ｄ）、第２の給湯配管２０から中温水を取り出せるように流路を構成する。続いて、制御装置３０は、開閉弁２４を開き、第２の混合弁２２で市水と混合した湯が所望温度となるように温度センサ２３で温度を検出しながら、第２の混合弁２２を調整し、ふろ配管２５を経由して浴槽２６に湯はりを行う。
湯はりの完了は、制御装置３０が、流量センサ２７の積算流量をカウントし、所望量となった時点で、開閉弁２４を閉じるように制御することで完了となる。 Next, the case of the hot water operation for supplying hot water to the bathtub 26 will be described.
In this case, when the control device 30 receives a hot water start instruction from the operation unit 31, the hot water operation starts. When the hot water pouring operation is started, first, it is detected by the temperature sensor 21 whether or not the medium temperature water can be taken out from the second hot water supply pipe 20, and if there is medium temperature water, the control device 30 judges it. The control device 30 is switched to the second hot water supply pipe 20 side by the first mixing valve 19 (arrow d in FIG. 1), and the flow path is configured so that the intermediate hot water can be taken out from the second hot water supply pipe 20. Subsequently, the control device 30 opens the on-off valve 24 and detects the temperature with the temperature sensor 23 so that the hot water mixed with the city water at the second mixing valve 22 reaches a desired temperature, while the second mixing valve 22. And hot water is applied to the bathtub 26 via the bath 25.
Completion of hot water is completed when the control device 30 counts the integrated flow rate of the flow rate sensor 27 and controls to close the on-off valve 24 when the desired amount is reached.

なお、湯張り中に中温水が少なくなったり、あるいは所望湯はり湯温よりも低い温度の中温水しか取り出すことができないことを温度センサ２１により制御装置３０が検出した場合は、第１の混合弁１９により第１の給湯配管５を通して供給される高温水と前記中温水を混合し、温度センサ１１により湯はり湯温以上となるように制御装置３０により制御しながら第２の混合弁２２へ湯の供給を行う。
また、温度センサ２１により検出した中温水の温度が市水と同レベルまで低くなった場合は、制御装置３０が第１の混合弁１９を貯湯タンク２の上部から貯湯水を取り出す第１の給湯配管５側に切り替えて（図１中、矢印ｅ）、第１の給湯配管５から高温水を取り出せるように流路を構成する。続いて、制御装置３０は、開閉弁２４を開き、以下、前述と同様の動作で湯はりを行う。 If the control device 30 detects that the intermediate temperature water is reduced during hot water filling or only the intermediate temperature water having a temperature lower than the desired hot water temperature can be taken out, the first mixing is performed. The high temperature water supplied through the first hot water supply pipe 5 by the valve 19 and the medium temperature water are mixed, and the temperature sensor 11 controls the hot water hot water temperature to be equal to or higher than the hot water temperature to the second mixing valve 22. Supply hot water.
Further, when the temperature of the medium-temperature water detected by the temperature sensor 21 is lowered to the same level as the city water, the control device 30 causes the first mixing valve 19 to take out the hot water from the upper part of the hot water tank 2. By switching to the pipe 5 side (arrow e in FIG. 1), the flow path is configured so that high temperature water can be taken out from the first hot water supply pipe 5. Subsequently, the control device 30 opens the on-off valve 24 and performs hot water pouring by the same operation as described above.

次に、床暖房を行う場合の動作について説明する。
この場合は、操作部３１により制御装置３０が床暖房開始の指示を受けると、床暖房動作が開始される。床暖房動作が開始されると、まず、循環ポンプ１３が動作して床暖房器８内のブラインが暖房循環回路１２を循環し、暖房用熱交換器９を通って床暖房器８内に戻される（図１中、矢印ｃ）。一方、循環ポンプ１０も動作して、貯湯タンク１の上部より高温の貯湯水が放熱用循環回路７に導かれ、暖房用熱交換器９を通って貯湯タンク１の下部に戻される（図１中、矢印ｂ）。このとき、暖房用熱交換器９は、貯湯タンク１内に貯湯された高温の貯湯水から低温のブラインに熱交換（伝熱）することで、ブラインを床暖房に適した温度に加熱昇温させる。また、一方で、高温の貯湯水は熱を奪われ、中温水（概ね５０℃程度）となって貯湯タンク１に戻る。 Next, the operation when performing floor heating will be described.
In this case, when the control device 30 receives an instruction to start floor heating from the operation unit 31, the floor heating operation is started. When the floor heating operation is started, first, the circulation pump 13 is operated so that the brine in the floor heater 8 circulates in the heating circulation circuit 12 and returns to the floor heater 8 through the heating heat exchanger 9. (Arrow c in FIG. 1). On the other hand, the circulating pump 10 is also operated so that hot water stored at a temperature higher than that of the hot water storage tank 1 is guided to the heat circulation circuit 7 and returned to the lower part of the hot water storage tank 1 through the heating heat exchanger 9 (FIG. 1). Middle, arrow b). At this time, the heat exchanger 9 for heating heats the brine to a temperature suitable for floor heating by exchanging heat from the hot hot water stored in the hot water storage tank 1 to the low temperature brine (heat transfer). Let On the other hand, the hot hot water is deprived of heat and returned to the hot water tank 1 as medium hot water (approximately 50 ° C.).

次に、床暖房によって生成される中温水の処理によるヒートポンプサイクルを用いた加熱方法での加熱効率（成績係数）の向上を実現する動作について説明する。
図２〜図５は、床暖房を実施した後、浴槽２６への湯張りを実施した場合の貯湯タンク１内の貯湯水の変化を示した図で、図２は、ヒートポンプ本体１４により貯湯タンク１内の沸き上げ完了時の貯湯水の状態を示し、貯湯タンク１内の右斜線部が高温の貯湯水を示している。
この状態で、前記のように床暖房を行うと、放熱用循環回路７により貯湯タンク１上方から高温の貯湯水を暖房用熱交換器９で熱交換し、中温水となって貯湯タンク１に戻る。このような床暖房運転を継続すると、貯湯タンク１内の高温の貯湯水が減少し、中温水（左斜線で示す）が増加してゆき、やがて図３のような状態となる。この状態で、例えばヒートポンプ本体１４により貯湯タンク１内の沸き上げを行おうとすると、床暖房で生成された中温水をヒートポンプサイクルで熱交換を行うことになり、前述したように、沸き上げ時の加熱効率（成績係数）が低下することになる。 Next, the operation | movement which implement | achieves the improvement of the heating efficiency (coefficient of performance) by the heating method using the heat pump cycle by the process of the medium temperature water produced | generated by floor heating is demonstrated.
2 to 5 are diagrams showing changes in hot water in the hot water storage tank 1 when hot water filling is performed on the bathtub 26 after floor heating, and FIG. 1 shows the state of the hot water at the time of completion of boiling in the hot water storage tank 1, and the right oblique line portion in the hot water storage tank 1 shows the hot hot water.
In this state, when floor heating is performed as described above, high-temperature hot water is exchanged in the heat exchanger 9 from above the hot water storage tank 1 by the circulation circuit 7 for heat dissipation, and becomes intermediate temperature water in the hot water storage tank 1. Return. If such floor heating operation is continued, the hot hot water in the hot water storage tank 1 decreases, the medium hot water (indicated by the left oblique line) increases, and eventually the state shown in FIG. 3 is reached. In this state, for example, if the heat pump main body 14 is used to boil the hot water storage tank 1, the medium-temperature water generated by floor heating is exchanged in a heat pump cycle. The heating efficiency (coefficient of performance) will decrease.

ここで、図３のような状態のとき、本実施の形態１では、使用者が浴槽２６への湯はり動作を実施すると、前述したように、温度センサ２１が検出する中温水の温度は一般に５０℃程度であるから、湯はりの所望温度範囲（３５〜４５℃程度）よりも十分高温であるので、制御装置３０は、第１の混合弁１９を第２の給湯配管２０から図１中、矢印ｄで示すように、中温水を取り出して湯はりに利用するように制御する。これにより、給水配管３から図１中矢印ｆのように新たな市水が貯湯タンク１内の下部に注入されることになり、結果として、図４のような状態となる。   Here, in the first embodiment, when the user performs the hot water pouring operation to the bathtub 26 in the state as shown in FIG. 3, the temperature of the medium temperature water detected by the temperature sensor 21 is generally as described above. Since it is about 50 ° C., the temperature is sufficiently higher than the desired temperature range (about 35 to 45 ° C.) of the hot water, so that the control device 30 connects the first mixing valve 19 from the second hot water supply pipe 20 in FIG. As shown by the arrow d, control is performed so that the medium-temperature water is taken out and used for hot water. As a result, new city water is injected from the water supply pipe 3 into the lower part of the hot water storage tank 1 as shown by the arrow f in FIG. 1, resulting in the state shown in FIG.

なお、中温水を湯はりに利用してゆき、例えば、貯湯タンク１内にたまった中温水だけで浴槽２６への所望湯はり湯量が確保できる場合はよいが、確保ができない場合、あるいは生成された中温水が時間経過とともに温度低下してゆき、そのままでは湯はりに使用できないような状態になることも想定される。ここでは、貯湯タンク１内の中温水が湯はりに直接使用できない温度まで低下してしまったような状態、例えば、図５に示すような状態について説明する。 It should be noted that the intermediate hot water is used for hot water, for example, it is good if the desired hot water amount to the bathtub 26 can be secured only by the intermediate hot water accumulated in the hot water storage tank 1, but if it cannot be secured or is generated. In addition, it is assumed that the temperature of the medium-temperature water decreases as time passes, so that it cannot be used for hot water as it is. Here, a state in which the medium temperature water in the hot water storage tank 1 has decreased to a temperature at which it cannot be directly used for the hot water beam, for example, a state as shown in FIG. 5 will be described.

この場合、前述のように、温度センサ２１の検出値が湯はりに適さない、例えば３５℃以下を検出すると、制御装置３０は、温度センサ１１の検出値が所望湯はり温度以上となるように第１の混合弁１９を第１の給湯配管５からの高温水と第２の給湯配管２０からの温度低下した中温水とを混合するように制御することにより供給する。（図５中、矢印ｄ、ｅ）。この第１の混合弁１９での混合制御の際に、前記の温度低下した中温水を使いきってしまい、第２の給湯配管からの供給が市水に切り替わってしまうような場合、制御装置３０は、第１の混合弁１９を高温水のみを供給する側に制御するが、このとき、開閉弁２４を一時的に閉じるように制御する。 In this case, as described above, when the detected value of the temperature sensor 21 is not suitable for hot water, for example, 35 ° C. or less, the control device 30 causes the detected value of the temperature sensor 11 to be equal to or higher than the desired hot water temperature. The 1st mixing valve 19 is supplied by controlling so that the high temperature water from the 1st hot water supply piping 5 and the medium temperature water from which the temperature fell from the 2nd hot water supply piping 20 may be mixed. (In FIG. 5, arrows d and e). In the case of mixing control by the first mixing valve 19, in the case where the medium-temperature water whose temperature has been lowered is used up and the supply from the second hot water supply pipe is switched to city water, the control device 30. Controls the first mixing valve 19 to supply only high-temperature water, and at this time, controls the on-off valve 24 to be temporarily closed.

すなわち、浴槽２６への湯はり中において、第１の混合弁１９に供給される湯の温度が、第２の給湯配管２０側から供給されていた中温水（５０℃程度〜温度低下した場合でも３０度程度）がなくなると、制御装置３０は、第１の混合弁１９を高温水のみを供給する側に制御するので、それまで高温水と中温水を混合していた前記第１の混合弁１９は、短い時間で高温水のみを給湯する側に切り替えられるため、一時的に混合比率が増大することで、一時的な高温出湯が発生するが、本実施の形態１では、前記第１の混合弁１９の混合比率が一定以上の割合で変化するときには、制御装置３０により一時的に開閉弁２４を閉じて、あらかじめ第１の混合弁１９の混合比を調整した後、開閉弁２４を開くように制御するので、給湯される湯温の急激な変動を防止して、意図しない高温出湯を防止するようにしている。   That is, even when the temperature of hot water supplied to the first mixing valve 19 is medium hot water (from about 50 ° C. to a temperature drop) supplied from the second hot water supply pipe 20 side during hot water supply to the bathtub 26. When there is no more (about 30 degrees), the control device 30 controls the first mixing valve 19 to the side that supplies only high-temperature water, so that the first mixing valve that previously mixed high-temperature water and medium-temperature water was used. 19 can be switched to a side where only high-temperature water is supplied in a short period of time, so that a temporary high-temperature hot water is generated due to a temporary increase in the mixing ratio. In the first embodiment, the first When the mixing ratio of the mixing valve 19 changes at a certain ratio or higher, the control device 30 temporarily closes the on-off valve 24, adjusts the mixing ratio of the first mixing valve 19 in advance, and then opens the on-off valve 24. So as to control the temperature of the hot water being supplied To prevent intense fluctuation, so as to prevent unintentional high temperature hot water.

また、前述の手段は、あらかじめ所望温度と所望量が給湯システム側で把握することが可能なふろ側の給湯であるがゆえに可能な手段であり、一般の蛇口１８などの給湯では、使用中に給湯を一時的に遮断してしまうため、所望温度と所望量が給湯システム側で把握することは困難である。さらに、中温水の絶対的な処理量の観点からみても、ふろ湯はりへの利用が家庭の湯の利用では、他の給湯に比べて格段に大量であり、また浴槽２６への供給であるので、万が一、若干の高温出湯があっても浴槽容量（通常２００リットル程度）からみて十分に少ないため、温度変化により使用者に不快感を与えることは極めて少ない。   Further, the above-mentioned means is possible because it is a bath-side hot water supply in which a desired temperature and a desired amount can be grasped in advance on the hot-water supply system side. Since the hot water supply is temporarily shut off, it is difficult for the hot water supply system to grasp the desired temperature and the desired amount. Furthermore, also from the viewpoint of the absolute amount of medium-temperature water treated, the use for bath water is much larger than that for other hot water supply in the use of hot water at home, and is also supplied to the bathtub 26. Therefore, even if there is a slight high-temperature hot water, it is sufficiently small in view of the bathtub capacity (usually about 200 liters), and therefore it is extremely unlikely that the user will feel uncomfortable due to temperature changes.

また、上記実施の形態１によれば、第２の給湯配管２０側に逆止弁２１ａを備えているので、第１の混合弁１９が中途半端な混合状態で停止した状態においても、高温水側から中温水側への比重の違いによる高温水の廻りこみが起こらないため、第１の混合弁１９では常に高温水と中温水の供給を適切に受けることができ、高温出湯を生じさせるような一時的な高温水同士の混合という状態を起こさない。   Moreover, according to the said Embodiment 1, since the non-return valve 21a is provided in the 2nd hot-water supply piping 20 side, even in the state which the 1st mixing valve 19 stopped in the halfway mixed state, Since the high temperature water does not flow around due to the difference in specific gravity from the side to the medium temperature water side, the first mixing valve 19 can always properly receive the supply of the high temperature water and the medium temperature water so as to generate the high temperature hot water. No temporary mixing of hot water.

また、中温水をふろ湯はりに利用したあとの図４や図５のような状態で、ヒートポンプ本体１４による沸き上げを行えば、貯湯タンク１の下部に注入された市水からの沸き上げとなるので、沸き上げ時の加熱効率（成績係数）の低下を最小限に抑えることが可能となる。   4 and FIG. 5 after using the warm water for bath water, if the heat pump body 14 is used for boiling, boiling from the city water injected into the lower part of the hot water tank 1 Therefore, it is possible to minimize a decrease in heating efficiency (coefficient of performance) during boiling.

また、本実施の形態１によれば、床暖房により生成される中温水をふろの湯はりに利用することによって、ヒートポンプ方式による沸き上げ時の加熱効率の低下を軽減することができる。   Moreover, according to this Embodiment 1, the fall of the heating efficiency at the time of boiling by a heat pump system can be reduced by using the intermediate temperature water produced | generated by floor heating for a bath water.

実施の形態２．
図６は本発明の実施の形態２を示す貯湯式給湯システムの構成図である。
図６では、第１の混合弁１９の手前に逆止弁２０ａを配するとともに、第２の混合弁２２の手前の第２の給水バイパス管４にも逆止弁４ａを配し、また一般給湯側混合弁１６の手前の第１給水バイパス管３にも逆止弁３ａを配したものである。この図６の実施の形態２によれば、図１に示したものと同様の効果を得ることができる。また、浴槽への湯はり（給湯）に限られず、蛇口等からの一般給湯でも同様の効果を得ることができる。 Embodiment 2. FIG.
FIG. 6 is a configuration diagram of a hot water storage type hot water supply system showing Embodiment 2 of the present invention.
In FIG. 6, a check valve 20a is arranged in front of the first mixing valve 19, and a check valve 4a is also arranged in the second water supply bypass pipe 4 in front of the second mixing valve 22. A check valve 3 a is also arranged in the first water supply bypass pipe 3 in front of the hot water supply side mixing valve 16. According to the second embodiment of FIG. 6, the same effect as that shown in FIG. 1 can be obtained. Moreover, it is not restricted to the hot water supply (hot water supply) to a bathtub, The same effect can be acquired also with the general hot water supply from a faucet etc.

本発明の実施の形態１を示す貯湯式給湯システムの構成図である。It is a block diagram of the hot water storage type hot water supply system which shows Embodiment 1 of this invention. 図１の貯湯式給湯システムにおける沸き上げ完了時の貯湯水の状態を示した図である。It is the figure which showed the state of the hot water at the time of completion of boiling in the hot water storage type hot-water supply system of FIG. 図１の貯湯式給湯システムにおける床暖房時の貯湯水の変化を示した図である。It is the figure which showed the change of the hot water stored at the time of floor heating in the hot water storage type hot water supply system of FIG. 図１の貯湯式給湯システムにおける浴槽湯はり時の貯湯水の変化を示した図である。It is the figure which showed the change of the stored hot water at the time of bathtub hot water filling in the hot water storage type hot-water supply system of FIG. 図１の貯湯式給湯システムにおける浴槽湯はり時の貯湯水の変化を示した図である。It is the figure which showed the change of the stored hot water at the time of bathtub hot water filling in the hot water storage type hot-water supply system of FIG. 本発明の実施の形態２を示す貯湯式給湯システムの構成図である。It is a block diagram of the hot water storage type hot-water supply system which shows Embodiment 2 of this invention.

符号の説明Explanation of symbols

１ 貯湯タンク、２ 給水配管、３ 第１の給水バイパス管、４ 第２の給水バイパス管、５ 第１の給湯配管、６ 給湯バイパス管、１４ ヒートポンプ本体、１６ 一般給湯側混合弁、１９ 第１の混合弁、２０ 第２の給湯配管、２１ 温度センサ、２２ 第２の混合弁、２３ 温度センサ、２４ 開閉弁、２５ ふろ配管、２６ 浴槽、３０ 制御装置、３１ 操作部。   DESCRIPTION OF SYMBOLS 1 Hot water storage tank, 2 Water supply pipe, 3 1st water supply bypass pipe, 4 2nd water supply bypass pipe, 5 1st hot water supply pipe, 6 Hot water supply bypass pipe, 14 Heat pump main body, 16 General hot water supply side mixing valve, 19 1st 20 mixing valve, 20 second hot water supply pipe, 21 temperature sensor, 22 second mixing valve, 23 temperature sensor, 24 opening / closing valve, 25 bath piping, 26 bathtub, 30 control device, 31 operation unit.

Claims (5)

貯湯タンクを有する貯湯式給湯システムにおいて、
貯湯タンクの上部から出湯する第１の給湯配管と、貯湯タンクの中ほどから出湯する１つあるいは複数の第２の給湯配管と、第１の給湯配管から出湯する第１配管水と第２の給湯配管から出湯する第２配管水との出湯を混合する第１の混合弁と、この第１の混合弁からの出湯と市水を混合して所望温度の温水を生成する第２の混合弁と、この第２の混合弁の下流に設けられて生成された温水の供給と停止を行う開閉弁と、前記各混合弁、開閉弁等給湯システム全体の動作を制御する制御装置とを有することを特徴とする貯湯式給湯システム。 In a hot water storage hot water supply system having a hot water storage tank,
A first hot water supply pipe for discharging hot water from the upper part of the hot water storage tank, one or a plurality of second hot water supply pipes for discharging hot water from the middle of the hot water storage tank, a first pipe water for discharging hot water from the first hot water supply pipe, and a second A first mixing valve that mixes the hot water with the second piping water discharged from the hot water supply piping, and a second mixing valve that mixes the hot water from the first mixing valve and city water to generate hot water at a desired temperature. And an on-off valve that is provided downstream of the second mixing valve and that supplies and stops the generated hot water, and a control device that controls the operation of the entire hot water supply system such as each mixing valve and on-off valve. Hot water storage hot water supply system characterized by 前記制御装置は、前記第１の配管水と第２の配管水とを混合する第１の混合弁の混合比率が一定以上の割合で変化するときに、前記開閉弁を一時的に閉動作させて生成された温水の供給を停止させ、混合比率変更後に前記開閉弁を開動作させて出湯を再開させることを特徴とする請求項１記載の貯湯式給湯システム。 The control device temporarily closes the on-off valve when a mixing ratio of the first mixing valve for mixing the first piping water and the second piping water changes at a certain ratio or more. 2. The hot water storage hot water supply system according to claim 1, wherein supply of the hot water generated is stopped, and after the mixing ratio is changed, the on-off valve is opened to restart the hot water. 前記第２の給湯配管に逆止弁を配したことを特徴とする請求項１または２に記載の貯湯式給湯システム。 The hot water storage hot water supply system according to claim 1 or 2, wherein a check valve is arranged in the second hot water supply pipe. 生成された所望温度の温水をふろ給湯専用に利用するように構成したことを特徴とする請求項１〜３のいずれかに記載の貯湯式給湯システム。 The hot water storage hot water supply system according to any one of claims 1 to 3, wherein the generated hot water having a desired temperature is used exclusively for bath hot water supply. 前記第２の給湯配管は、貯湯タンクの任意の位置から貯湯タンク内に挿入し、貯湯タンク内で所望の湯水取り出し位置までその湯水取出口を延設するようにしたことを特徴とする請求項１〜４のいずれかに記載の貯湯式給湯システム。 The second hot water supply pipe is inserted into the hot water storage tank from an arbitrary position of the hot water storage tank, and the hot water outlet is extended to a desired hot water extraction position in the hot water storage tank. The hot water storage hot water supply system according to any one of 1 to 4.
JP2003302824A 2003-08-27 2003-08-27 Hot water storage hot water supply system Expired - Fee Related JP4052206B2 (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007032996A (en) * 2005-07-29 2007-02-08 Matsushita Electric Ind Co Ltd Hot-water storage type hot-water supply unit
JP2007139345A (en) * 2005-11-21 2007-06-07 Corona Corp Hot water storage-type water heater and method for changing standby opening of hot water supply mixing valve therefor
JP2007139201A (en) * 2005-11-14 2007-06-07 Corona Corp Hot water storage type water heater
JP2009186024A (en) * 2008-02-01 2009-08-20 Panasonic Electric Works Co Ltd Hot water storage type hot water supply system
JP2012042090A (en) * 2010-08-18 2012-03-01 Panasonic Corp Hot water storage type water heater
JP2012167903A (en) * 2011-02-16 2012-09-06 Corona Corp Storage type water heater

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007032996A (en) * 2005-07-29 2007-02-08 Matsushita Electric Ind Co Ltd Hot-water storage type hot-water supply unit
JP2007139201A (en) * 2005-11-14 2007-06-07 Corona Corp Hot water storage type water heater
JP2007139345A (en) * 2005-11-21 2007-06-07 Corona Corp Hot water storage-type water heater and method for changing standby opening of hot water supply mixing valve therefor
JP2009186024A (en) * 2008-02-01 2009-08-20 Panasonic Electric Works Co Ltd Hot water storage type hot water supply system
JP2012042090A (en) * 2010-08-18 2012-03-01 Panasonic Corp Hot water storage type water heater
JP2012167903A (en) * 2011-02-16 2012-09-06 Corona Corp Storage type water heater

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