JP2020034190A - Hot water storage and supply device - Google Patents

Hot water storage and supply device Download PDF

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JP2020034190A
JP2020034190A JP2018158952A JP2018158952A JP2020034190A JP 2020034190 A JP2020034190 A JP 2020034190A JP 2018158952 A JP2018158952 A JP 2018158952A JP 2018158952 A JP2018158952 A JP 2018158952A JP 2020034190 A JP2020034190 A JP 2020034190A
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hot water
storage tank
water storage
temperature
passage
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金城 貴信
Takanobu Kaneshiro
貴信 金城
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Noritz Corp
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Abstract

To provide a hot water storage and supply device capable of shortening a time required for heating sterilization treatment for hot water in a hot water storage tank where Legionella bacteria proliferate, to reduce energy consumption.SOLUTION: A hot water storage and supply device (1), when hot water in a hot water storage tank (5) stays for a certain time or more, is heated by an auxiliary heat source device (4) through a circulation heating circuit (20) to perform a sterilization operation. In the hot water storage and supply device, the hot water storage tank (5) is provided with a plurality of temperature sensors (5b, 5c, 5d) for detecting an internal hot water temperature. In the sterilization operation, circulating means is controlled to adjust an initial circulating flow rate at the beginning of the operation in accordance with the hot water temperature situation inside the hot water storage tank (5) detected by the temperature sensors (5b, 5c, 5d).SELECTED DRAWING: Figure 3

Description

本発明は、レジオネラ菌等が繁殖した貯湯タンク内の湯水の加熱殺菌処理に要する時間を短縮して、エネルギー消費の低減を図る貯湯給湯装置に関する。   TECHNICAL FIELD The present invention relates to a hot water storage / hot water supply apparatus that reduces the time required for heat sterilization of hot water in a hot water storage tank in which Legionella bacteria and the like have propagated, thereby reducing energy consumption.

従来から、ヒートポンプ給湯装置や燃料電池等の外部熱源機で加熱された湯水を貯湯タンクに貯留し、この貯留された湯水を給湯先に供給可能なエネルギー効率が高い貯湯給湯装置が一般に広く普及している。このような貯湯給湯装置は、外部熱源機と、この外部熱源機で加熱された湯水を貯留する貯湯タンク、外部熱源機と貯湯タンクとの間に湯水を循環させる湯水循環回路等を備え、貯湯タンク内の湯水を湯水循環回路に循環させて外部熱源機で加熱し、加熱された湯水を貯湯タンクに戻して貯留し、給湯栓や浴槽等の所望の給湯先に給湯するものである。   2. Description of the Related Art Conventionally, hot water storage water heaters with high energy efficiency that can store hot water heated by an external heat source device such as a heat pump water heater or a fuel cell in a hot water storage tank and supply the stored hot water to a hot water supply destination have been widely used. ing. Such a hot water storage / hot water supply device includes an external heat source device, a hot water storage tank for storing hot water heated by the external heat source device, a hot water circulation circuit for circulating hot water between the external heat source device and the hot water storage tank, and the like. The hot water in the tank is circulated through a hot water circulation circuit and heated by an external heat source device, and the heated hot water is returned to a hot water storage tank and stored therein, and supplied to a desired hot water supply destination such as a hot water tap or a bathtub.

上記の貯湯給湯装置では、貯湯タンク内の湯水が長時間使用されない場合、貯湯タンク内の湯水にレジオネラ菌等の雑菌が繁殖し汚染されているので、そのままでは給湯や浴室へ供給できない。このため、これらの雑菌を死滅させるべく、貯湯タンク内の湯水を再加熱する殺菌処理が行われている。   In the above hot water storage / hot water supply device, when the hot water in the hot water storage tank is not used for a long time, the hot water in the hot water storage tank is contaminated with bacteria such as Legionella bacteria and cannot be supplied as it is to the hot water supply or the bathroom. Therefore, in order to kill these germs, a sterilization process of reheating the hot water in the hot water storage tank is performed.

殺菌処理は、貯湯タンクの下部から湯水を取り出し貯湯給湯装置に設けられた補助熱源機で加熱し、高温となった湯水を貯湯タンクの上部に戻すことを繰り返し行い、貯湯タンク内の湯水全体が約75℃以上になるように再加熱している。   The sterilization process is performed by repeatedly taking out hot water from the lower part of the hot water storage tank, heating the hot water with the auxiliary heat source device provided in the hot water storage device, and returning the hot water to the upper part of the hot water storage tank. It is reheated to about 75 ° C or higher.

通常、一定時間以上(例えば、100時間以上)貯湯タンク内の湯水が使用されていないことを判定した場合に上記殺菌処理が行われるが、貯湯タンク内の湯水が全て高温に加熱殺菌されるまで、原則として貯湯タンク内の湯水の利用は禁止されるため、殺菌処理中は、貯湯タンクから給湯や湯張り等への供給経路を遮断して給湯や湯張りへの使用を制限している。   Usually, the sterilization processing is performed when it is determined that the hot water in the hot water storage tank is not used for a certain time or more (for example, 100 hours or more). However, since the use of hot water in the hot water storage tank is prohibited in principle, the supply path from the hot water storage tank to hot water supply or hot water filling is shut off during sterilization treatment, thereby restricting use for hot water supply or hot water filling.

そこで、殺菌処理をなるべく早く終了させるために、大流量で湯水を循環させて補助熱源機で加熱して、貯湯タンク内の上部から戻すことが考えられる。しかし、加熱された湯水を貯湯タンク内の上部から大流量で注入すると、貯湯タンク内の湯水が攪拌されて、貯湯タンク内に形成された温度成層が崩れてしまうという問題があった。貯湯タンク内に形成されている温度成層が崩れると、貯湯タンク内の湯水に部分的に低温の部分が残り、貯湯タンク内の湯水全体を70℃以上にする殺菌処理に相当な時間を要していた。   Therefore, in order to terminate the sterilization process as soon as possible, it is conceivable to circulate hot water at a large flow rate, heat the hot water with an auxiliary heat source device, and return the hot water from the upper portion in the hot water storage tank. However, when the heated hot water is injected at a large flow rate from the upper portion of the hot water storage tank, there is a problem that the hot water in the hot water storage tank is agitated and the temperature stratification formed in the hot water storage tank collapses. When the temperature stratification formed in the hot water storage tank collapses, a part of the hot water in the hot water storage tank has a low temperature part, and it takes a considerable time to sterilize the hot water in the hot water storage tank to 70 ° C. or more. I was

一方、貯湯タンク内の湯水の温度成層を保ったまま殺菌処理を行うために、少ない循環流量で循環させることが考えられる。しかし、少ない循環流量の場合も、やはり貯湯タンク内の湯水全体を再加熱するには時間を要し、その間貯湯タンク内の湯水を給湯や湯張りへの使用が制限されるため、ユーザに不便を強いることになる。   On the other hand, in order to perform the sterilization process while maintaining the temperature stratification of the hot water in the hot water storage tank, circulation with a small circulation flow rate may be considered. However, even with a small circulation flow rate, it takes time to reheat the entire hot water in the hot water storage tank, and during that time, the use of hot water in the hot water storage tank for hot water supply and hot water filling is restricted, which is inconvenient for the user. Will be forced.

特許文献1の本願出願人による特許出願の明細書には、貯湯タンク内の湯水の温度成層を保ったまま殺菌処理を行う貯湯給湯装置が開示されている。この装置によれば、殺菌処理のための加熱開始直後は少量の循環流量で循環させ、貯湯タンク内にある程度高温の湯水が貯湯された後は循環流量を徐々に増加させることで、貯湯タンク内の温度成層を保った状態での殺菌処理を可能としている。   The specification of the patent application by the present applicant in Patent Document 1 discloses a hot water storage / hot water supply apparatus that performs a sterilization process while maintaining the temperature stratification of hot water in a hot water storage tank. According to this device, by circulating at a small circulation flow rate immediately after the start of heating for sterilization treatment, and gradually increasing the circulation flow rate after hot water is stored to a certain degree in the hot water storage tank, the inside of the hot water storage tank is gradually increased. The sterilization process can be performed while maintaining the temperature stratification.

特願2017−059723号明細書Japanese Patent Application No. 2017-059723

しかし、特許文献1の貯湯給湯装置では、貯湯タンク内の湯水の温度状況にかかわらず、加熱開始直後は少量の循環流量で循環させ、貯湯タンク内の上部の湯水の温度が一定温度であることを検知した際に循環流量を徐々に増加させるので、貯湯タンク内の湯水の殺菌処理に要する時間を短縮することはできなかった。   However, in the hot water supply device of Patent Document 1, regardless of the temperature of the hot water in the hot water storage tank, the hot water is circulated with a small circulation flow rate immediately after the start of heating, and the temperature of the hot water in the upper portion of the hot water storage tank is constant. Since the circulating flow rate is gradually increased when is detected, the time required for sterilizing hot water in the hot water storage tank cannot be reduced.

本発明の目的は、レジオネラ菌等が繁殖した貯湯タンク内の湯水の加熱殺菌処理に要する時間を短縮して、エネルギー消費の低減を図り効率を向上させた貯湯給湯装置を提供することである。   It is an object of the present invention to provide a hot water storage and hot water supply apparatus in which the time required for heat sterilization treatment of hot water in a hot water storage tank in which Legionella bacteria and the like have propagated is reduced, energy consumption is reduced, and efficiency is improved.

請求項1の貯湯給湯装置は、湯水を加熱する加熱手段と、前記貯湯タンクの下部から湯水を取り出し前記加熱手段によって加熱して貯湯タンクの上部に戻す循環加熱回路と、前記循環加熱回路に設けた循環手段とを備え、前記貯湯タンク内の湯水が一定時間以上滞留した場合に前記循環加熱回路を通じて前記加熱手段により加熱して殺菌運転を行う貯湯給湯装置において、前記貯湯タンクには内部の湯水温度を検知するための温度検知手段が複数設けられており、前記殺菌運転においては、前記温度検知手段によって検知される前記貯湯タンク内部の湯水温度状況に応じて殺菌運転開始当初の初期循環流量を調整するように前記循環手段を制御することを特徴としている。   The hot water supply apparatus according to claim 1 is provided in the heating means for heating the hot water, a circulation heating circuit for taking out the hot water from a lower part of the hot water storage tank, heating the hot water by the heating means and returning the hot water to an upper part of the hot water storage tank, and the circulation heating circuit. And a circulating means, wherein when the hot and cold water in the hot water storage tank stays for a predetermined time or more, the hot water storage device is heated by the heating means through the circulating heating circuit to perform a sterilization operation. A plurality of temperature detecting means for detecting a temperature is provided, and in the sterilization operation, the initial circulation flow rate at the start of the sterilization operation is set according to the temperature of hot water in the hot water storage tank detected by the temperature detection means. It is characterized in that the circulation means is controlled so as to adjust.

請求項2の貯湯給湯装置は、請求項1の発明において、前記温度検知手段は、複数の温度検知手段の内、前記貯湯タンクの上部に設けられた複数の温度検知手段であり、前記貯湯タンクの上部にある殺菌温度以上の温水の湯量が所定量以上の場合には前記初期循環流量を最大流量となるように前記循環手段を制御することを特徴としている。   According to a second aspect of the present invention, in the hot water storage device according to the first aspect, the temperature detection unit is a plurality of temperature detection units provided above the hot water storage tank among the plurality of temperature detection units. When the amount of hot water at or above the sterilization temperature at the upper portion is equal to or more than a predetermined amount, the circulating means is controlled so that the initial circulating flow becomes the maximum flow.

請求項3の貯湯給湯装置は、請求項1又は2の発明において、前記加熱手段は燃焼式瞬間給湯装置であることを特徴としている。   A hot water supply apparatus according to a third aspect is characterized in that, in the invention according to the first or second aspect, the heating means is a combustion type instantaneous hot water supply apparatus.

請求項1の発明によれば、殺菌運転において、温度検知手段によって検知される貯湯タンク内部の湯水温度状況に応じて殺菌運転開始当初の初期循環流量を調整するように循環手段を制御するので、貯湯タンク内に形成された湯水の温度成層を崩さない範囲で初期循環流量を調整し、殺菌運転の所要時間を短縮することできる。   According to the invention of claim 1, in the sterilization operation, the circulation unit is controlled so as to adjust the initial circulation flow rate at the start of the sterilization operation according to the temperature of the hot and cold water in the hot water storage tank detected by the temperature detection unit. The initial circulation flow rate is adjusted within a range that does not destroy the temperature stratification of the hot water formed in the hot water storage tank, and the time required for the sterilization operation can be reduced.

例えば、貯湯タンクの上段部の湯水の温度が例えば65℃未満であれば、貯湯タンク内の最上層の湯水の温度が低いため、殺菌運転開始当初は、例えば5L/minの初期循環流量で循環させることにより貯湯タンク内の温度成層を維持することができる。これに対して、貯湯タンクの上段部の湯水の温度が例えば65℃以上であって貯湯タンクの中段部の湯水の温度が例えば65℃未満であれば、貯湯タンク内の最上層の湯水は比較的高温のため、最初から例えば7L/minの初期循環流量で循環させても貯湯タンク内の温度成層を維持することができる。   For example, if the temperature of the hot water in the upper part of the hot water storage tank is, for example, less than 65 ° C., the temperature of the hot water of the uppermost layer in the hot water storage tank is low. By doing so, the temperature stratification in the hot water storage tank can be maintained. On the other hand, if the temperature of the hot water in the upper part of the hot water storage tank is, for example, 65 ° C. or higher and the temperature of the hot water in the middle part of the hot water storage tank is, for example, lower than 65 ° C., the hot water of the uppermost layer in the hot water storage tank is compared. Because of the extremely high temperature, the temperature stratification in the hot water storage tank can be maintained even if the liquid is circulated from the beginning at an initial circulation flow rate of, for example, 7 L / min.

請求項2の発明によれば、前記所定の温度検知手段は、複数の温度検知手段の内、貯湯タンクの上部に設けられた複数の温度検知手段で構成され、前記貯湯タンクの上部にある殺菌温度以上の温水の湯量が所定量以上の場合には前記初期循環流量を最大流量となるように前記循環手段を制御するので、上記と同様の効果を得ることができる。   According to the second aspect of the present invention, the predetermined temperature detecting means is constituted by a plurality of temperature detecting means provided at an upper part of the hot water storage tank among the plurality of temperature detecting means, and a sterilizing means at an upper part of the hot water storage tank is provided. When the amount of hot water at or above the temperature is equal to or more than a predetermined amount, the circulating means is controlled so that the initial circulating flow rate becomes the maximum flow rate, so that the same effect as described above can be obtained.

例えば、貯湯タンクの中段部の湯水の温度が例えば65℃以上であれば、貯湯タンク内の上層付近には高温の温水が貯留されているため、初期循環流量を最大流量(例えば8L/min)で循環させても貯湯タンク内の温度成層を崩さない範囲で殺菌運転の所要時間を短縮することできる。   For example, if the temperature of the hot water in the middle part of the hot water storage tank is, for example, 65 ° C. or higher, the initial circulation flow rate is the maximum flow rate (for example, 8 L / min) because high-temperature hot water is stored near the upper layer in the hot water storage tank. The time required for the sterilization operation can be reduced within a range that does not destroy the temperature stratification in the hot water storage tank even when the hot water is circulated.

請求項3の発明によれば、加熱手段は燃焼式瞬間給湯装置であるため、循環流量が変動した際も湯水の加熱能力が不足することはない。   According to the third aspect of the present invention, since the heating means is a combustion type instantaneous hot water supply device, even when the circulation flow rate fluctuates, there is no shortage of hot water heating capacity.

本発明の実施形態に係るヒートポンプ式貯湯給湯装置の概略構成図である。It is a schematic structure figure of a heat pump type hot-water storage hot-water supply device concerning an embodiment of the present invention. 貯湯給湯装置の詳細な構成図である。It is a detailed block diagram of a hot-water storage hot-water supply apparatus. 貯湯タンク内の湯水の殺菌運転制御のフローチャートである。It is a flowchart of the sterilization operation control of hot water in a hot water storage tank.

以下、本発明を実施するための形態について実施例に基づいて説明する。   Hereinafter, embodiments for carrying out the present invention will be described based on examples.

ヒートポンプ式貯湯給湯装置1の全体構成について説明する。
図1及び図2に示すように、ヒートポンプ式貯湯給湯装置1は、補助熱源機4を有する貯湯給湯ユニット2と、ヒートポンプ熱源機3を有し、貯湯給湯ユニット2とヒートポンプ熱源機3は加熱回路10を介して接続されている。
The overall configuration of the heat pump hot water storage / hot water supply device 1 will be described.
As shown in FIGS. 1 and 2, a heat pump hot water supply / hot water supply apparatus 1 includes a hot water supply / hot water supply unit 2 having an auxiliary heat source unit 4 and a heat pump heat source unit 3. The hot water supply unit 2 and the heat pump heat source unit 3 are provided with a heating circuit. 10 are connected.

最初に、貯湯給湯ユニット2について説明する。
図2に示すように、貯湯給湯ユニット2は、補助熱源機4と、湯水を貯留する貯湯タンク5と、貯湯タンク5の上端部に接続された出湯通路6と、出湯通路6に接続されて湯水を給湯先へ供給する給湯通路7と、給湯通路7から分岐して浴槽15に湯張りを行う注湯通路8と、浴槽15からの湯水を加熱するための風呂追焚通路9と、貯湯タンク5の湯水をヒートポンプ熱源機3で加熱して貯湯タンク5に貯留するように循環させる加熱回路10と、貯湯タンク5に上水を供給する給水通路13と、湯水と上水を混合する混合弁14と、風呂追焚通路9に設けられた熱交換器12と、各種制御を行う制御ユニット11と、操作リモコン41等を備えている。
First, the hot water supply unit 2 will be described.
As shown in FIG. 2, the hot water supply unit 2 is connected to an auxiliary heat source unit 4, a hot water storage tank 5 for storing hot water, a hot water passage 6 connected to an upper end of the hot water storage tank 5, and a hot water supply passage 6. A hot water supply passage 7 for supplying hot water to a hot water supply destination, a pouring passage 8 branched from the hot water supply passage 7 to fill the bathtub 15, a bath reheating passage 9 for heating hot water from the bathtub 15, A heating circuit 10 for circulating the hot water in the tank 5 with the heat pump heat source device 3 so as to store the hot water in the hot water storage tank 5; a water supply passage 13 for supplying clean water to the hot water storage tank 5; The control apparatus includes a valve 14, a heat exchanger 12 provided in the bath additional heating passage 9, a control unit 11 for performing various controls, an operation remote controller 41, and the like.

貯湯タンク5の側部には、複数の温度センサ5a〜5dが上下方向に適当間隔おきに設けられ、貯湯タンク5内に貯留された湯水の温度成層毎の温度を検知する。貯留された湯水の降温を防ぐために、貯湯タンク5の周囲は断熱材(図示略)で覆われている。なお、温度センサ5a〜5dが「温度検知手段」に相当する。   A plurality of temperature sensors 5a to 5d are provided at appropriate intervals in the vertical direction on the side of the hot water storage tank 5, and detect the temperature of each of the temperature stratified hot water stored in the hot water storage tank 5. In order to prevent the temperature of the stored hot water from dropping, the periphery of the hot water storage tank 5 is covered with a heat insulating material (not shown). Note that the temperature sensors 5a to 5d correspond to "temperature detecting means".

次に、貯湯給湯ユニット2とヒートポンプ熱源機3とを接続する加熱回路10について説明する。加熱回路10は、往き通路部10aと戻り通路部10bとこれらを接続するバイパス通路部10cとを備えている。往き通路部10aは、その上流端が貯湯タンク5の下端部に接続され、その下流端はヒートポンプ熱源機3内の凝縮熱交換器37に接続されている。戻り通路部10bは、その上流端が凝縮熱交換器37に接続され、その下流端は貯湯タンク5の上端部に接続されている。   Next, the heating circuit 10 for connecting the hot water supply unit 2 and the heat pump heat source unit 3 will be described. The heating circuit 10 includes a forward passage 10a, a return passage 10b, and a bypass passage 10c connecting these. The upstream end of the outward passage 10 a is connected to the lower end of the hot water storage tank 5, and the downstream end thereof is connected to the condensation heat exchanger 37 in the heat pump heat source unit 3. The return passage 10 b has an upstream end connected to the condensation heat exchanger 37, and a downstream end connected to the upper end of the hot water storage tank 5.

往き通路部10aの途中部に循環ポンプ18が介装され、戻り通路部10bの途中部には循環温度センサ10dが設けられている。往き通路部10aとバイパス通路部10cの接続箇所に切換三方弁19が介装されている。切換三方弁19を切換えることで、バイパス通路部10c側と貯湯タンク5側とに切換え可能に構成されている。切換三方弁19をバイパス通路部10c側に切換えるとヒートポンプ熱源機3で加熱された湯水を貯湯タンク5に戻さずに再度ヒートポンプ熱源機3に送って再加熱可能に構成されている。   A circulation pump 18 is interposed in the middle of the forward passage 10a, and a circulation temperature sensor 10d is provided in a middle of the return passage 10b. A switching three-way valve 19 is interposed at a connection point between the going passage portion 10a and the bypass passage portion 10c. By switching the switching three-way valve 19, the switching between the bypass passage 10c side and the hot water storage tank 5 side can be performed. When the switching three-way valve 19 is switched to the bypass passage portion 10c side, the hot water heated by the heat pump heat source unit 3 is sent back to the heat pump heat source unit 3 without returning to the hot water storage tank 5 so as to be reheated.

ヒートポンプ熱源機3は、補助制御ユニット35を介して制御ユニット11により制御され、圧縮機36、凝縮熱交換器37、膨張弁38、蒸発熱交換器39を冷媒配管40により接続することでヒートポンプ回路を構成し、冷媒配管40に封入された冷媒と外気の熱を利用して湯水を加熱する装置である。   The heat pump heat source unit 3 is controlled by the control unit 11 through the auxiliary control unit 35, and connects the compressor 36, the condensation heat exchanger 37, the expansion valve 38, and the evaporation heat exchanger 39 by the refrigerant pipe 40, thereby forming a heat pump circuit. This is a device for heating hot water using the refrigerant sealed in the refrigerant pipe 40 and the heat of the outside air.

次に給水通路13について説明する。
給水通路13は、上水源から低温の上水を貯湯タンク5等に供給するものであり、上流端が上水源に接続され、下流端が貯湯タンク5の下端部に接続されている。給水通路13から給水バイパス通路22が分岐され混合弁14に接続されている。給水通路13には給水温度センサ23が設けられ且つ分岐部よりも上流側に給水開閉弁24が設けられ、分岐部よりも下流側に逆止弁25が設けられ、給水バイパス通路22には逆止弁26が設けられている。給水バイパス通路22から分岐され給湯通路7に接続された高温出湯回避通路28が、ユーザが予期しない高温出湯を回避可能に設けられている。
Next, the water supply passage 13 will be described.
The water supply passage 13 supplies low-temperature water from the water supply source to the hot water storage tank 5 and the like. The upstream end is connected to the water supply source, and the downstream end is connected to the lower end of the hot water storage tank 5. A water supply bypass passage 22 branches off from the water supply passage 13 and is connected to the mixing valve 14. A water supply temperature sensor 23 is provided in the water supply passage 13, a water supply opening / closing valve 24 is provided upstream of the branch portion, a check valve 25 is provided downstream of the branch portion, and a reverse check valve 25 is provided in the water supply bypass passage 22. A stop valve 26 is provided. A hot water tap avoidance passage 28 branched from the water supply bypass passage 22 and connected to the hot water supply passage 7 is provided so as to avoid hot water tapping unexpected by the user.

次に、出湯通路6及び給湯通路7について説明する。
出湯通路6は、その上流端が貯湯タンク5の上端部に接続され下流端が混合弁14に接続され、混合弁14には給湯通路7が接続されている。混合弁14は、使用者が操作リモコン41を介して設定した給湯設定温度の湯水を給湯通路7へ供給し、又は給湯設定温度の湯水を浴槽15に供給するために、給水バイパス通路22から供給される低温の上水と出湯通路6から供給される高温の湯水との混合比を調節する。給湯設定温度に調節された湯水は給湯通路7から給湯栓に供給される。給湯通路7には、混合弁14によって調節された湯水温度及び湯水流量を検知可能な給湯温度センサ30及び給湯流量センサ31が設けられ、給湯温度及び給湯流量を検知する。
Next, the hot water supply passage 6 and the hot water supply passage 7 will be described.
The hot water supply passage 6 has an upstream end connected to the upper end of the hot water storage tank 5, a downstream end connected to the mixing valve 14, and a hot water supply passage 7 connected to the mixing valve 14. The mixing valve 14 supplies hot water at the hot water set temperature set by the user via the operation remote controller 41 to the hot water supply passage 7 or supplies hot water at the hot water set temperature to the bathtub 15 from the water supply bypass passage 22. The mixing ratio between the low temperature tap water to be supplied and the high temperature tap water supplied from the tap water passage 6 is adjusted. The hot water adjusted to the hot water supply set temperature is supplied from the hot water supply passage 7 to the hot water tap. The hot water supply passage 7 is provided with a hot water supply temperature sensor 30 and a hot water supply flow rate sensor 31 capable of detecting the hot water temperature and the hot water flow rate adjusted by the mixing valve 14, and detects the hot water supply temperature and the hot water supply flow rate.

次に、注湯通路8について説明する。
給湯通路7から分岐され浴槽15に湯張りを行う注湯通路8には開閉弁8aが設けられ、注湯通路8の下流端は後述する風呂往き通路部9aに接続されている。操作リモコン41を介して設定した給湯設定温度の湯水を浴槽15に供給するには、貯湯タンク5の上部からの湯水が、出湯通路6により混合弁14へ流れ、混合弁14において給水バイパス通路22からの上水と混合されて給湯設定温度の湯水となって注湯通路8に流れ、開閉弁8aと風呂追焚通路9を通って浴槽15に供給される。
Next, the pouring passage 8 will be described.
An opening / closing valve 8a is provided in a pouring passage 8 branched from the hot water supply passage 7 to fill the bathtub 15 with water, and a downstream end of the pouring passage 8 is connected to a bath passage passage 9a described later. In order to supply hot water at a set hot water supply temperature to the bathtub 15 via the operation remote controller 41, hot water from the upper portion of the hot water storage tank 5 flows to the mixing valve 14 through the hot water supply passage 6, and the water supply bypass passage 22 in the mixing valve 14. The hot water is mixed with the fresh water from the hot water to form hot water at a hot water supply set temperature, flows into the pouring passage 8, and is supplied to the bathtub 15 through the on-off valve 8 a and the bath additional heating passage 9.

次に、風呂追焚用の風呂追焚通路9及び熱交換器12について説明する。
熱交換器12は、補助出湯通路20eの下流部に接続された追焚湯水通路21を流れる湯水と風呂追焚通路9を流れる湯水との間の熱交換により、浴槽15の湯水を加熱する。追焚湯水通路21には開閉弁21aが設けられ、風呂追焚運転時以外は熱交換器12に湯水が流れないように閉止されている。
Next, the bath reheating passage 9 and the heat exchanger 12 for reheating the bath will be described.
The heat exchanger 12 heats the hot and cold water in the bathtub 15 by heat exchange between hot and cold water flowing through the additional hot water passage 21 connected to the downstream portion of the auxiliary hot water supply passage 20e and hot and cold water flowing through the additional hot water passage 9. An opening / closing valve 21a is provided in the supplementary hot water passage 21 and is closed so that hot water does not flow into the heat exchanger 12 except during the bath supplementary heating operation.

風呂追焚通路9は、浴槽15の湯水を循環させて熱交換器12において加熱するものであり、熱交換器12で加熱された湯水を浴槽15に送る風呂往き通路部9aと、浴槽15の湯水を熱交換器12に送る追焚用ポンプ16を備えた風呂戻り通路部9bを有する。風呂往き通路部9aは、熱交換後の浴槽15の湯水の温度を検知する風呂往き温度センサ9cを備え、風呂戻り通路部9bは、追焚用ポンプ16と、風呂戻り温度センサ9dと、浴槽15の水位を検知する水位センサ9eを備えている。   The bath reheating passage 9 circulates the hot and cold water in the bathtub 15 and heats the hot water in the heat exchanger 12. The hot water and hot water heated by the heat exchanger 12 is sent to the bathtub 15. It has a bath return passage 9b provided with a reheating pump 16 for sending hot water to the heat exchanger 12. The bath going passage 9a includes a bath going temperature sensor 9c for detecting the temperature of hot and cold water in the bath tub 15 after heat exchange, and the bath returning passage 9b has a reheating pump 16, a bath returning temperature sensor 9d, and a bath tub. A water level sensor 9e for detecting 15 water levels is provided.

追焚湯水通路21の下流端が接続される湯水戻り通路21bは給水通路13の下流部に接続されている。補助熱源機4に湯水を供給するための上部補助通路20aが出湯通路6から分岐して三方弁27に接続され、補助熱源機4に低温の湯水や上水を供給するための下部補助通路20bが湯水戻り通路21bから延びて三方弁27に接続され、三方弁27から延びる補助導入通路20cが補助熱源機4に接続されている。   A hot water return passage 21 b to which the downstream end of the additional hot water passage 21 is connected is connected to a downstream portion of the water supply passage 13. An upper auxiliary passage 20a for supplying hot and cold water to the auxiliary heat source unit 4 is branched from the hot water outlet passage 6 and connected to the three-way valve 27, and a lower auxiliary passage 20b for supplying low-temperature hot and cold water to the auxiliary heat source unit 4 Extends from the hot water return passage 21b and is connected to the three-way valve 27, and an auxiliary introduction passage 20c extending from the three-way valve 27 is connected to the auxiliary heat source unit 4.

補助導入通路20cには循環ポンプ34が介装されている。補助熱源機4で加熱された高温湯水が出湯される補助出湯通路20eは混合弁14よりも上流側で出湯通路6に接続され、補助出湯通路20eには循環温度センサ32と流量調整弁33が介装されている。三方弁27は、貯湯タンク5側と下部補助通路20b側を択一的に切換え可能に構成されている。なお、循環ポンプ34が「循環手段」に相当する。   A circulation pump 34 is interposed in the auxiliary introduction passage 20c. Auxiliary tapping passage 20e, from which high-temperature hot water heated by auxiliary heat source unit 4 taps, is connected to tapping passage 6 upstream of mixing valve 14, and a circulation temperature sensor 32 and a flow control valve 33 are provided in auxiliary tapping passage 20e. It is interposed. The three-way valve 27 is configured to be able to selectively switch between the hot water storage tank 5 side and the lower auxiliary passage 20b side. Note that the circulation pump 34 corresponds to “circulation means”.

次に、補助熱源機4について説明する。
補助熱源機4は、バーナや熱交換器等を内蔵した公知の燃焼式瞬間給湯装置(ガス給湯器)で構成され、制御ユニット11からの指令により燃焼作動して補助導入通路20cから流入する湯水を加熱可能である。補助熱源機4によって加熱された湯水は補助出湯通路20eを流れて出湯通路6を通って貯湯タンク5に戻される。なお、補助熱源機4が「加熱手段」に相当する。
Next, the auxiliary heat source unit 4 will be described.
The auxiliary heat source unit 4 is constituted by a known instantaneous combustion type hot water supply device (gas water heater) having a built-in burner, a heat exchanger, and the like. Can be heated. The hot water heated by the auxiliary heat source unit 4 flows through the auxiliary hot water passage 20e and returns to the hot water storage tank 5 through the hot water passage 6. Note that the auxiliary heat source unit 4 corresponds to a “heating unit”.

また、貯湯タンク5内の湯水を殺菌処理する際にこの補助熱源機4が使用される。
具体的には、殺菌運転を行う際、三方弁27が下部補助通路20b側に切換えられ、循環ポンプ34を作動させて貯湯タンク5内の低温の湯水を下部補助通路20b及び補助導入通路20cを通って補助熱源機4へ導入する。補助熱源機4で加熱されて高温となった湯水は、補助出湯通路20eと出湯通路6を順に通って貯湯タンク5の上部へ戻される。なお、下部補助通路20b,補助導入通路20c,補助出湯通路20e及び出湯通路6の一部からなる循環回路で循環加熱回路20が形成される。
The auxiliary heat source unit 4 is used for sterilizing hot water in the hot water storage tank 5.
Specifically, when performing the sterilization operation, the three-way valve 27 is switched to the lower auxiliary passage 20b side, and the circulation pump 34 is operated to supply the low-temperature hot water in the hot water storage tank 5 to the lower auxiliary passage 20b and the auxiliary introduction passage 20c. Then, it is introduced into the auxiliary heat source unit 4. The hot water heated by the auxiliary heat source unit 4 and having a high temperature is returned to the upper part of the hot water storage tank 5 through the auxiliary hot water passage 20e and the hot water passage 6 in order. The circulation heating circuit 20 is formed by a circulation circuit including the lower auxiliary passage 20b, the auxiliary introduction passage 20c, the auxiliary tapping passage 20e, and a part of the tapping passage 6.

次に、制御ユニット11について説明する。
制御ユニット11は、温度センサ5a〜5d、循環温度センサ10d,32、給水温度センサ23、給湯温度センサ30、その他の給湯流量センサ31等により各部の温度や流量等を取得し、切換三方弁19、混合弁14、三方弁27、流量調整弁33、その他の弁類、追焚用ポンプ16、循環ポンプ18,34等を作動させ、ヒートポンプ熱源機3を加熱運転して給湯設定温度での湯張りや給湯するように貯湯運転、給湯運転等の制御を行う。また、貯湯タンク5内の湯水が長時間使用されていないことを検知した際は、後述する貯湯タンク5内の湯水の殺菌処理運転の制御を行う。
Next, the control unit 11 will be described.
The control unit 11 obtains the temperature and flow rate of each part by the temperature sensors 5a to 5d, the circulation temperature sensors 10d and 32, the water supply temperature sensor 23, the hot water supply temperature sensor 30, the other hot water supply flow rate sensors 31, and the like. , The mixing valve 14, the three-way valve 27, the flow control valve 33, other valves, the reheating pump 16, the circulation pumps 18, 34, and the like are operated, and the heat pump heat source unit 3 is operated to heat the hot water at the set hot water supply temperature. Control of hot water storage operation, hot water supply operation, etc. is performed so as to stretch or supply hot water. When it is detected that the hot water in the hot water storage tank 5 has not been used for a long time, the control of the sterilization operation of the hot water in the hot water storage tank 5 described later is performed.

次に、ヒートポンプ式貯湯給湯装置1で行われる殺菌処理運転について説明する。
殺菌処理運転は、貯湯タンク5内の湯水が一定時間(例えば、100時間)以上滞留した場合、貯湯タンク5内の湯水はレジオネラ菌などの雑菌が繁殖して汚染されている虞があるので、そのまま貯湯タンク5内の湯水を給湯や湯張りへ使用することは禁止されている。そこで、貯湯タンク5内の下部から低温の湯水を循環させ、循環加熱回路20を介して補助熱源機4により加熱して、貯湯タンク5内の湯水全体が約70℃以上となるように再加熱し、レジオネラ菌等の雑菌を加熱殺菌している。
Next, the sterilization operation performed by the heat pump hot water storage / hot water supply device 1 will be described.
In the sterilization operation, if the hot water in the hot water storage tank 5 stays for a certain time (for example, 100 hours) or more, the hot water in the hot water storage tank 5 may be contaminated by propagation of various bacteria such as Legionella bacteria. It is prohibited to use the hot water in the hot water storage tank 5 for hot water supply or hot water filling as it is. Therefore, low-temperature hot water is circulated from the lower portion of the hot water storage tank 5 and is heated by the auxiliary heat source unit 4 through the circulation heating circuit 20 so that the entire hot water in the hot water storage tank 5 is heated to about 70 ° C. or more. Then, various bacteria such as Legionella bacteria are sterilized by heating.

具体的には、三方弁27を下部補助通路20b側に切換えて、循環ポンプ34を作動させて、貯湯タンク5内の低温層となっている湯水を、貯湯タンク5の下部に接続された下部補助通路20bと補助導入通路20cを順に通って補助熱源機4に導入し、補助熱源機4で加熱された高温湯水を、補助出湯通路20eと出湯通路6を順に経由して、貯湯タンク5の上部へ流入させることで、貯湯タンク5内の湯水が再加熱される。   More specifically, the three-way valve 27 is switched to the lower auxiliary passage 20b side, and the circulation pump 34 is operated so that the hot and cold water in the hot water storage tank 5 is removed from the lower part connected to the lower part of the hot water storage tank 5. The hot water heated by the auxiliary heat source device 4 is introduced into the auxiliary heat source device 4 through the auxiliary passage 20b and the auxiliary introduction passage 20c in order, and the high-temperature hot water heated by the auxiliary heat source device 4 is sequentially passed through the auxiliary hot water supply passage 20e and the hot water discharge passage 6 to the hot water storage tank 5. The hot water in the hot water storage tank 5 is reheated by flowing into the upper part.

このとき、最初から最大の循環流量で循環加熱回路20を循環させて補助熱源機4で再加熱を行って貯湯タンク5内の上部へ戻すと、貯湯タンク5内の湯水が攪拌されて温度成層が崩れ、貯湯タンク5内の湯水に部分的に低温の部分が残り、そのままの状態で湯水全体が約70℃以上となるように再加熱するには長時間要することになる。   At this time, when the circulation heating circuit 20 is circulated from the beginning at the maximum circulation flow rate, reheating is performed by the auxiliary heat source unit 4 and returned to the upper part in the hot water storage tank 5, the hot water in the hot water storage tank 5 is stirred and the temperature stratification occurs. Then, it takes a long time to reheat the hot and cold water to a temperature of about 70 ° C. or higher in the hot water in the hot water storage tank 5.

このため、前記貯湯タンク5内部の湯水温度状況に応じて殺菌運転が開始された当初の初期循環流量を例えば5〜8L/minの範囲で調整して循環ポンプ34を制御して循環加熱回路20を循環させて、補助熱源機4で再加熱を行って貯湯タンク5内の上部へ戻すので、貯湯タンク5内に形成された温度成層を崩さずに、短期間で貯湯タンク内の湯水全体を再加熱し、殺菌処理に要する時間の短縮を図っている。   For this reason, the initial circulation flow rate at the start of the sterilization operation is adjusted, for example, within a range of 5 to 8 L / min in accordance with the temperature of the hot and cold water in the hot water storage tank 5 to control the circulation pump 34 to control the circulation heating circuit 20. Is circulated and reheated by the auxiliary heat source unit 4 and returned to the upper portion in the hot water storage tank 5, so that the entire hot and cold water in the hot water storage tank can be quickly removed without breaking the temperature stratification formed in the hot water storage tank 5. It reheats and shortens the time required for sterilization.

次に、制御ユニット11で実行されるヒートポンプ式貯湯給湯装置1による殺菌処理運転の制御について、図3のフローチャートに基づいて簡単に説明する。尚、フローチャート中のSi(i=1,2,・・・)は各ステップを表す。   Next, control of the sterilization operation by the heat pump hot water supply / hot water supply device 1 executed by the control unit 11 will be briefly described based on the flowchart of FIG. Note that Si (i = 1, 2,...) In the flowchart represents each step.

まず、制御ユニット11において貯湯タンク5内の湯水が一定時間(例えば、100時間)以上滞留したと判定されると、レジオネラ菌対策の為に貯湯タンク5内の湯水を再加熱する殺菌処理運転がスタートする。   First, when the control unit 11 determines that the hot water in the hot water storage tank 5 has stayed for a predetermined time (for example, 100 hours) or more, a sterilization operation for reheating the hot water in the hot water storage tank 5 to prevent legionella bacteria is performed. Start.

S1において、給湯や追い炊き動作がされていないか否かの判定を行い、判定がYesの場合はS2に進み、判定がNoの場合はリターンしてS1の判定を繰り返す。
次に、S2において暖房運転動作がされていないことの判定を行い、判定がYesの場合はS4に進み、判定がNoの場合はS3に進んで貯湯タンク5内の再加熱及び暖房運転を同時に行う制御が実行されてS1にリターンする。
In S1, it is determined whether or not hot water supply or additional cooking operation is performed. If the determination is Yes, the process proceeds to S2, and if the determination is No, the process returns and repeats the determination in S1.
Next, in S2, it is determined that the heating operation is not performed. If the determination is Yes, the process proceeds to S4. If the determination is No, the process proceeds to S3 to simultaneously perform the reheating and the heating operation in the hot water storage tank 5. The control to be performed is executed, and the process returns to S1.

ここで、S1及びS2の判定がYesの場合は、給湯や追い炊き動作、暖房動作が停止され、貯湯タンク5内の湯水が滞留したままのため、S4から初期循環流量を調整する制御がなされる。   Here, if the determinations of S1 and S2 are Yes, the hot water supply, the additional heating operation, and the heating operation are stopped, and the hot water in the hot water storage tank 5 remains stagnant. Therefore, the control for adjusting the initial circulation flow rate is performed from S4. You.

S4において、貯湯タンク5の第1温度センサ5dの検出温度が65℃以下か否かの判定を行い、判定がYesの場合はS5に進み、初期循環流量が5L/minとなるように循環ポンプ34が制御され、循環加熱回路20を循環させて補助熱源機4で70℃以上に再加熱を行って貯湯タンク5内の湯水の殺菌処理のための加熱が行われる。次に、S6に進み、第1温度センサ5dの検出温度が66℃以上で連続60秒経過したか否かの判定を行い判定がYesの場合はS14に進み、判定がNoの場合はS6を繰り返す。   In S4, it is determined whether or not the temperature detected by the first temperature sensor 5d of the hot water storage tank 5 is equal to or lower than 65 ° C. If the determination is Yes, the process proceeds to S5, and the circulation pump is controlled so that the initial circulation flow rate is 5 L / min. 34 is controlled, the circulation heating circuit 20 is circulated, the auxiliary heat source device 4 reheats the temperature to 70 ° C. or higher, and heating for hot water sterilization in the hot water storage tank 5 is performed. Next, the process proceeds to S6, where it is determined whether or not the temperature detected by the first temperature sensor 5d is 66 ° C. or higher and continuous 60 seconds have elapsed. If the determination is Yes, the process proceeds to S14. If the determination is No, S6 is performed. repeat.

S4の判定がNoの場合はS7に進み、貯湯タンク5の第2温度センサ5cの検出温度が65℃以下か否かの判定を行い、判定がYesの場合はS8に進み、初期循環流量が6L/minとなるように循環ポンプ34が制御され、上記と同様に貯湯タンク5内の湯水の殺菌処理のための加熱が行われる。次に、S9に進み、第2温度センサ5cの検出温度が66℃以上で連続60秒経過したか否かの判定を行い判定がYesの場合はS14に進み、判定がNoの場合はS9を繰り返す。   If the determination in S4 is No, the process proceeds to S7, in which it is determined whether the temperature detected by the second temperature sensor 5c of the hot water storage tank 5 is equal to or lower than 65 ° C. If the determination is Yes, the process proceeds to S8, and the initial circulation flow rate is reduced. The circulation pump 34 is controlled so as to be 6 L / min, and heating for hot water sterilization in the hot water storage tank 5 is performed in the same manner as described above. Next, the process proceeds to S9, in which it is determined whether or not the temperature detected by the second temperature sensor 5c is equal to or higher than 66 ° C. and continuous 60 seconds have elapsed. If the determination is Yes, the process proceeds to S14. If the determination is No, S9 is performed. repeat.

S7の判定がNoの場合はS10に進み、貯湯タンク5の第3温度センサ5bの検出温度が65℃以下か否かの判定を行い、判定がYesの場合はS11に進み、初期循環流量が7L/minとなるように循環ポンプ34が制御され、上記と同様に貯湯タンク5内の湯水の殺菌処理のための加熱が行われる。次に、S12に進み、第3温度センサ5bの検出温度が66℃以上で連続60秒経過したか否かの判定を行い判定がYesの場合はS14に進み、判定がNoの場合はS12を繰り返す。   If the determination in S7 is No, the process proceeds to S10, in which it is determined whether the temperature detected by the third temperature sensor 5b of the hot water storage tank 5 is 65 ° C. or less. If the determination is Yes, the process proceeds to S11, where the initial circulation flow rate is reduced. The circulation pump 34 is controlled so as to be 7 L / min, and heating for hot water sterilization in the hot water storage tank 5 is performed in the same manner as described above. Next, the process proceeds to S12, where it is determined whether or not the temperature detected by the third temperature sensor 5b is equal to or higher than 66 ° C. and continuous 60 seconds have elapsed. If the determination is Yes, the process proceeds to S14. If the determination is No, S12 is performed. repeat.

一方、S10の判定がNoの場合はS13に進み、初期循環流量が8L/minとなるように循環ポンプ34が制御され、上記と同様に貯湯タンク5内の湯水の殺菌処理のための加熱が行われる。すなわち、S10の判定がNoの場合とは、貯湯タンク5の第3温度センサ5bの検出温度が65℃以上となるので、貯湯タンク5の容量の約1/2は高温水が貯留されているため最大の初期循環流量で循環させても、温度成層を崩さずに維持できる。   On the other hand, if the determination in S10 is No, the process proceeds to S13, in which the circulation pump 34 is controlled so that the initial circulation flow rate is 8 L / min, and heating for hot water sterilization in the hot water storage tank 5 is performed in the same manner as described above. Done. That is, when the determination in S10 is No, the detection temperature of the third temperature sensor 5b of the hot water storage tank 5 is equal to or higher than 65 ° C., so that about の of the capacity of the hot water storage tank 5 stores high-temperature water. Therefore, even when circulating at the maximum initial circulation flow rate, the temperature stratification can be maintained without breaking.

S14においては、初期循環流量5〜7L/minから開始して少なくとも連続60秒経過しており、貯湯タンク5の上部に所定量以上の高温水(殺菌温度以上の温度の高温水)が貯留されていて、循環流量を大きくしても温度成層が崩れる虞がないので、循環流量1L/min増加するよう循環ポンプ34が変更制御され、循環加熱回路20を循環させて補助熱源機4で再加熱を行った湯水が補助出湯通路20e及び出湯通路6を経由して貯湯タンク5内へ上部から戻される。   In S14, at least 60 seconds have passed since the start of the initial circulation flow rate of 5 to 7 L / min, and a predetermined amount or more of high-temperature water (high-temperature water having a temperature equal to or higher than the sterilization temperature) is stored in the upper part of the hot-water storage tank 5. Therefore, even if the circulation flow rate is increased, there is no possibility that the temperature stratification will collapse. Therefore, the circulation pump 34 is changed and controlled so as to increase the circulation flow rate 1 L / min, the circulation heating circuit 20 is circulated, and the auxiliary heat source unit 4 reheats. Is returned from the upper portion into the hot water storage tank 5 via the auxiliary hot water passage 20e and the hot water passage 6.

S14において循環流量を1L/min増加する処理をした後、S15に進み殺菌処理運転のみが単独で動作されているか否かの判定を行い、Yesの場合はS16に進み、Noの場合はS1にリターンする。即ち、殺菌処理運転以外の給湯・追い炊き等の運転が行われ貯湯タンク5内の湯水が供給されている場合は、レジオネラ菌等の殺菌処理運転は待機状態となっているため、このまま殺菌処理運転を継続するのではなく、S1にリターンして初期状態に戻って、殺菌処理運転が再スタートされる。   After performing the process of increasing the circulation flow rate by 1 L / min in S14, the process proceeds to S15, and it is determined whether or not only the sterilization operation is operated alone. If Yes, the process proceeds to S16, and if No, the process proceeds to S1. To return. That is, when the operation other than the sterilizing operation is performed such as hot water supply and additional cooking and the hot water in the hot water storage tank 5 is supplied, the sterilizing operation for Legionella is in a standby state. Instead of continuing the operation, the process returns to S1 to return to the initial state, and the sterilization operation is restarted.

次に、S16〜S17において、貯湯タンク5の第2温度センサ5cの検出温度が70℃以上で連続60秒経過したか否かの判定を行い、S16〜S17がともにYesの場合はS18に進み循環流量が8L/minとなっているか否かの判定を行う。S18の判定がNoの場合、S14に戻って循環流量を1L/min増加する処理を行った後、S15〜S18の処理を繰り返す。   Next, in S16 to S17, it is determined whether or not the detection temperature of the second temperature sensor 5c of the hot water storage tank 5 is 70 ° C. or higher and continuous 60 seconds have elapsed. If both S16 to S17 are Yes, the process proceeds to S18. It is determined whether or not the circulation flow rate is 8 L / min. If the determination in S18 is No, the process returns to S14, performs the process of increasing the circulation flow rate by 1 L / min, and then repeats the processes of S15 to S18.

一方、S16がNoの場合は、S19に進み、第2温度センサ5cの検出温度が70℃以下の状態を連続15秒経過したか否かを判定し、Yesの場合は、貯湯タンク5内の湯水の再加熱が行われていないので、S1にリターンして初期状態に戻る。   On the other hand, if S16 is No, the process proceeds to S19, and it is determined whether or not the state where the temperature detected by the second temperature sensor 5c is 70 ° C. or less has continuously continued for 15 seconds. Since hot water has not been reheated, the process returns to S1 and returns to the initial state.

次に、S18の判定がYesの場合、すなわち循環流量が8L/min以上となっていると判定した場合はS20に進み、貯湯タンク5内が満蓄状態となっているか否かの判定を行う。S20の判定がYesの場合は、貯湯タンク5内の湯水の再加熱による殺菌処理運転を終了し、Noの場合は、S15〜18の処理を繰り返す。   Next, when the determination in S18 is Yes, that is, when it is determined that the circulation flow rate is 8 L / min or more, the process proceeds to S20, and it is determined whether or not the hot water storage tank 5 is full. . If the determination in S20 is Yes, the sterilization operation by reheating the hot water in the hot water storage tank 5 is terminated, and if No, the processes in S15 to S18 are repeated.

前記ヒートポンプ給湯装置の作用効果について説明する。
殺菌処理運転において、運転開始当初は、第1温度センサ5dの検出温度(貯湯タンク5の上段部の湯水温度)が65℃未満の場合は、貯湯タンク5内の最上層の湯水の温度が低いため、温度成層を崩さないように、初期循環流量を例えば5L/minで循環するように循環ポンプ34を制御する。
The operation and effect of the heat pump water heater will be described.
In the sterilization operation, when the temperature detected by the first temperature sensor 5d (water temperature in the upper part of the hot water storage tank 5) is lower than 65 ° C. at the beginning of the operation, the temperature of the uppermost hot water in the hot water storage tank 5 is low. Therefore, the circulating pump 34 is controlled so as to circulate the initial circulating flow rate at, for example, 5 L / min so as not to break the temperature stratification.

また、第1温度センサ5dの検出温度や第2温度センサ5cの検出温度(貯湯タンク5の上段部の湯水温度)が例えば65℃以上であって、第3温度センサ5bの検出温度(貯湯タンクの中段部の湯水温度)が例えば65℃未満であれば、貯湯タンク5内の上層の湯水は比較的高温のため、初期循環流量を例えば7L/minで循環するように循環ポンプ34を制御する。   Further, the detection temperature of the first temperature sensor 5d and the detection temperature of the second temperature sensor 5c (water temperature of the upper part of the hot water storage tank 5) are, for example, 65 ° C. or more, and the detection temperature of the third temperature sensor 5b (the hot water storage tank Is lower than, for example, 65 ° C., since the upper layer of hot water in the hot water storage tank 5 is relatively high temperature, the circulation pump 34 is controlled to circulate the initial circulation flow rate at, for example, 7 L / min. .

このように、第1〜3温度センサ5d,5c,5bによって検知される貯湯タンク5内部の湯水温度状況に応じて殺菌運転当初の初期循環流量を調整するように循環ポンプ34を制御し、その後最大循環流量まで段階的に流量を増加させるため、貯湯タンク5内に形成された湯水の温度成層を崩さず維持したまま、殺菌処理運転の所要時間を極力短縮することができる。   Thus, the circulation pump 34 is controlled so as to adjust the initial circulation flow rate at the beginning of the sterilization operation according to the temperature of the hot and cold water in the hot water storage tank 5 detected by the first to third temperature sensors 5d, 5c, 5b. Since the flow rate is increased stepwise up to the maximum circulation flow rate, the time required for the sterilization operation can be reduced as much as possible while maintaining the temperature stratification of the hot water formed in the hot water storage tank 5 without breaking down.

さらに、貯湯タンク5の上部にある殺菌温度以上の温水の湯量が所定量以上の場合、例えば、貯湯タンク5の第3温度センサ5bの検出温度(貯湯タンク5の中段部の湯水温度)が例えば65℃以上であれば、貯湯タンク5の容量の約1/2は高温水が貯留されているため、初期循環流量を最大流量(例えば8L/min)となるように循環ポンプ34を制御することで、貯湯タンク5内に形成された湯水の温度成層を崩さない範囲で殺菌運転の所要時間を短縮することできる。   Furthermore, when the amount of hot water above the sterilization temperature in the upper part of the hot water storage tank 5 is equal to or more than a predetermined amount, for example, the detection temperature of the third temperature sensor 5b of the hot water storage tank 5 (the temperature of the hot water in the middle part of the hot water storage tank 5) is, for example, If the temperature is 65 ° C. or higher, since the hot water is stored for about の of the capacity of the hot water storage tank 5, the circulation pump 34 should be controlled so that the initial circulation flow becomes the maximum flow (for example, 8 L / min). Thus, the time required for the sterilization operation can be reduced within a range in which the temperature stratification of the hot water formed in the hot water storage tank 5 is not broken.

即ち、殺菌処理運転開始当初、貯湯タンク5の上部にある殺菌温度以上の温水の湯量が所定量未満の場合には、貯湯タンク5の下部から取り出した湯水を、例えば5L/minの循環流量で循環させるように循環ポンプ34を制御するので、補助熱源機4で加熱された湯水を貯湯タンク5の上部から戻しても、貯湯タンク5内の比較的上部の高温層の湯水に注入されるだけであり、低温層まで攪拌されず温度成層は崩れない。   That is, at the beginning of the sterilization operation, if the amount of hot water above the sterilization temperature in the upper part of the hot water storage tank 5 is less than a predetermined amount, the hot water taken out from the lower part of the hot water storage tank 5 is circulated at a circulation flow rate of, for example, 5 L / min. Since the circulation pump 34 is controlled to circulate, even if the hot water heated by the auxiliary heat source unit 4 is returned from the upper portion of the hot water storage tank 5, only the hot water of the relatively high temperature layer in the hot water storage tank 5 is injected. The temperature stratification does not collapse without being stirred until the low temperature layer.

そして、殺菌処理運転開始から一定の時間を経過し、第2温度センサ5cによって検知される検出温度が、例えば70℃以上になれば、貯湯タンク5内の高温層がある程度広がっているので、初期循環流量を5〜7L/minから少しずつ(例えば1L/minずつ)増加するように循環ポンプ34を変更制御する。このため、貯湯タンク5内の高温層が徐々に広がるのに応じて循環流量を増量していくことにより温度成層を崩さずに、貯湯タンク5内の湯水全体を再加熱して殺菌処理運転を短時間で終了することができる。   When a certain time has elapsed from the start of the sterilization operation and the temperature detected by the second temperature sensor 5c is, for example, 70 ° C. or higher, the high-temperature layer in the hot water storage tank 5 has expanded to some extent. The circulation pump 34 is changed and controlled so that the circulation flow rate is gradually increased from 5 to 7 L / min (for example, 1 L / min). Therefore, by increasing the circulation flow rate as the high-temperature layer in the hot-water storage tank 5 gradually spreads, the entire hot water in the hot-water storage tank 5 is reheated without disturbing the temperature stratification, and the sterilization operation is performed. It can be completed in a short time.

上記実施例では、貯湯タンク5に設けられた上から2つ目の第2温度センサ5cの温度で70℃以上を検知した場合を例に説明したが、これに限定されるものではない。例えば、貯湯タンクの径が太い場合、高さがある場合等状況によって、検知する温度センサを変更可能に構成してもよい。   In the above embodiment, the case where the temperature of the second second temperature sensor 5c provided in the hot water storage tank 5 is 70 ° C. or more is described as an example, but the invention is not limited to this. For example, the temperature sensor to be detected may be configured to be changeable depending on circumstances such as a case where the diameter of the hot water storage tank is large and a case where the height is large.

その他、前記実施例はほんの一例にすぎず、当業者であれば、本発明の趣旨を逸脱することなく、前記実施例に種々の変更を付加した形態で実施可能であり、本発明はそのような変更形態も包含するものである。   In addition, the above-described embodiment is only an example, and those skilled in the art can implement the present invention in a form in which various changes are added to the above-described embodiment without departing from the spirit of the present invention. Various modifications are also included.

1 ヒートポンプ式貯湯給湯装置
2 貯湯給湯ユニット
3 ヒートポンプ熱源機
4 補助熱源機
5 貯湯タンク
5a〜5d 温度センサ
10 加熱回路
11 制御ユニット
20 循環加熱回路
20a 上部補助通路
20b 下部補助通路
20c 補助導入通路
20e 補助出湯通路
34 循環ポンプ
REFERENCE SIGNS LIST 1 heat pump hot water storage / hot water supply apparatus 2 hot water supply / hot water supply unit 3 heat pump heat source unit 4 auxiliary heat source unit 5 hot water storage tanks 5 a to 5 d temperature sensor 10 heating circuit 11 control unit 20 circulation heating circuit 20 a upper auxiliary passage 20 b lower auxiliary passage 20 c auxiliary introduction passage 20 e auxiliary Hot water passage 34 circulation pump

Claims (3)

湯水を貯留する貯湯タンクと、湯水を加熱する加熱手段と、前記貯湯タンクの下部から湯水を取り出し前記加熱手段によって加熱して貯湯タンクの上部に戻す循環加熱回路と、前記循環加熱回路に設けた循環手段とを備え、前記貯湯タンク内の湯水が一定時間以上滞留した場合に前記循環加熱回路を通じて前記加熱手段により加熱して殺菌運転を行う貯湯給湯装置において、
前記貯湯タンクには内部の湯水温度を検知するための温度検知手段が複数設けられており、前記殺菌運転においては、前記温度検知手段によって検知される前記貯湯タンク内部の湯水温度状況に応じて殺菌運転開始当初の初期循環流量を調整するように前記循環手段を制御することを特徴とする貯湯給湯装置。
A hot water storage tank for storing hot water, heating means for heating the hot water, a circulation heating circuit for taking out hot water from the lower part of the hot water storage tank, heating the hot water by the heating means and returning the hot water to the upper part of the hot water storage tank, and provided in the circulation heating circuit In the hot water supply device, comprising: a circulating means, and when the hot water in the hot water storage tank stays for a predetermined time or more, is heated by the heating means through the circulating heating circuit to perform a sterilization operation.
The hot water storage tank is provided with a plurality of temperature detecting means for detecting the temperature of hot water inside the hot water storage tank. In the sterilization operation, sterilization is performed according to the temperature of hot water inside the hot water storage tank detected by the temperature detecting means. A hot water supply apparatus for controlling the circulation means so as to adjust an initial circulation flow rate at the start of operation.
前記温度検知手段は、複数の温度検知手段の内、前記貯湯タンクの上部に設けられた複数の温度検知手段であり、前記貯湯タンクの上部にある殺菌温度以上の温水の湯量が所定量以上の場合には前記初期循環流量を最大流量となるように前記循環手段を制御することを特徴とする請求項1に記載の貯湯給湯装置。   The temperature detecting means is a plurality of temperature detecting means provided in the upper part of the hot water storage tank among the plurality of temperature detecting means, and the amount of hot water having a sterilizing temperature or higher in the upper part of the hot water storage tank is equal to or more than a predetermined amount. The hot water supply apparatus according to claim 1, wherein the circulating unit is controlled so that the initial circulating flow rate becomes a maximum flow rate in the case. 前記加熱手段は燃焼式瞬間給湯装置であることを特徴とする請求項1又は請求項2に記載の貯湯給湯装置。   3. The hot water supply apparatus according to claim 1, wherein the heating means is a combustion type instantaneous hot water supply apparatus.
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JPH05322306A (en) * 1992-05-26 1993-12-07 Matsushita Electric Ind Co Ltd Hot water storing and supplying device
JP2001296050A (en) * 2000-04-12 2001-10-26 Osaka Gas Co Ltd Hot water storage type hot water heater source device
JP2015059713A (en) * 2013-09-19 2015-03-30 株式会社ノーリツ Hot water supply device
JP2018162911A (en) * 2017-03-24 2018-10-18 株式会社ノーリツ Hot water storage and hot water supply device

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