JP2016180565A - Hot water storage type water heater - Google Patents

Hot water storage type water heater Download PDF

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JP2016180565A
JP2016180565A JP2015062061A JP2015062061A JP2016180565A JP 2016180565 A JP2016180565 A JP 2016180565A JP 2015062061 A JP2015062061 A JP 2015062061A JP 2015062061 A JP2015062061 A JP 2015062061A JP 2016180565 A JP2016180565 A JP 2016180565A
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hot water
water supply
temperature
heat exchanger
heating
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JP6323373B2 (en
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稲葉 好次
Yoshiji Inaba
好次 稲葉
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Mitsubishi Electric Corp
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Abstract

PROBLEM TO BE SOLVED: To suppress deposition of scale on a secondary side of a heat exchanger for hot water supply and to preferably maintain heat conduction efficiency and a hot water supply flow rate of the heat exchanger for hot water supply for a long period of time.SOLUTION: A heat pump type water heater includes: a heat pump unit 1; a hot water storage tank 8; a control unit 9; an outgoing pipeline 11 for water heating; a return pipeline 12 for water heating; a flow passage switching valve 13; a heat exchanger 16 for hot water supply; and a remote controller 40 and the like. The control unit 9 can execute both a heating utilization hot water supply operation for heating water by the heat exchanger 16 for hot water supply with heating hot water from the heat pump unit 1 as a heat source, and a stored hot water utilization hot water supply operation for heating water by the heat exchanger 16 for hot water supply with stored hot water from the hot water storage tank 8 as the heat source. Also, the control unit 9, by controlling the flow passage switching valve 13 when performing hot water supply, switches which hot water is introduced to a primary side flow passage of the heat exchanger 16 for hot water supply out of the heating hot water and the stored hot water, based on a target hot water supply temperature.SELECTED DRAWING: Figure 1

Description

本発明は、高硬度水も使用可能な貯湯式給湯機に関する。   The present invention relates to a hot water storage type water heater that can also use high hardness water.

従来技術として、例えば特許文献1に記載されているようなヒートポンプ式の給湯機が知られている。従来技術の給湯機は、タンクに貯留した高温水を熱源として使用する機能を備えている。詳しく述べると、給湯時には、タンクから熱交換器の1次側に導入される高温水と、熱交換器の2次側に導入される水道水、井戸水等の給湯用湯水との間で熱交換を行うことにより、給湯用湯水を加熱して外部に供給する。   As a prior art, for example, a heat pump type water heater as described in Patent Document 1 is known. The conventional water heater has a function of using high-temperature water stored in a tank as a heat source. More specifically, when hot water is supplied, heat is exchanged between high-temperature water introduced from the tank to the primary side of the heat exchanger and hot water for hot water supply such as tap water and well water introduced to the secondary side of the heat exchanger. The hot water for hot water supply is heated and supplied to the outside.

特開2012−7802号公報JP 2012-7802 A

上述した従来技術では、給湯用湯水として、カルシウム等の硬度成分が比較的高い濃度で含まれる高硬度水を使用することがある。しかしながら、高硬度水が給湯機の熱交換器内で加熱されると、水中の硬度成分が炭酸カルシウム等のスケール(固形析出物)となって析出し、これによって熱交換器の熱伝導効率が低下したり、熱交換器内にスケールが詰まって給湯流量が低下するという問題がある。   In the prior art described above, high-hardness water containing a relatively high concentration of hardness components such as calcium may be used as hot water for hot water supply. However, when high-hardness water is heated in the heat exchanger of the water heater, the hardness component in the water is deposited as a scale (solid precipitate) such as calcium carbonate, thereby improving the heat conduction efficiency of the heat exchanger. There is a problem that the temperature is lowered or the scale is clogged in the heat exchanger and the hot water flow rate is lowered.

本発明は、上述のような課題を解決するためになされたもので、給湯用熱交換器の2次側にスケールが付着するのを抑制し、給湯用熱交換器の熱伝導効率及び給湯流量を長期間にわたって良好に維持することが可能な貯湯式給湯機を提供することを目的としている。   The present invention has been made in order to solve the above-described problems, and suppresses the scale from adhering to the secondary side of the hot water heat exchanger, and the heat conduction efficiency and hot water flow rate of the hot water heat exchanger. It aims at providing the hot water storage type water heater which can maintain well for a long period of time.

本発明に係る貯湯式給湯機は、湯水を加熱する加熱源と、加熱源により加熱された温水を貯湯する貯湯タンクと、加熱源及び貯湯タンクから温水が導入される1次側流路と加熱対象水が導入される2次側流路とを有し、1次側流路と2次側流路との間で熱交換を行うことにより加熱対象水を加熱する給湯用熱交換器と、給湯用熱交換器の2次側流路から給湯対象に向けて流出する給湯温水の目標温度を目標給湯温度として設定する目標温度設定手段と、給湯用熱交換器の1次側流路に導入される温水を、加熱源により加熱された加熱温水と貯湯タンクに貯湯された貯湯温水の何れか一方に切換えることが可能な切換手段と、給湯を行うときに、切換手段を制御することにより、加熱温水と貯湯温水のうち何れの温水を給湯用熱交換器の1次側流路に導入するかを目標給湯温度に基いて切換える制御部と、を備えている。   The hot water storage type hot water supply apparatus according to the present invention includes a heating source for heating hot water, a hot water storage tank for storing hot water heated by the heating source, a primary flow path and heating for introducing hot water from the heating source and the hot water storage tank. A hot water supply heat exchanger that has a secondary flow path into which the target water is introduced and heats the heated target water by performing heat exchange between the primary flow path and the secondary flow path; Introduced into the primary flow path of the hot water supply heat exchanger and target temperature setting means for setting the target temperature of hot water hot water flowing out from the secondary flow path of the hot water supply heat exchanger toward the hot water supply target as the target hot water supply temperature By switching the hot water to be heated to either one of heated hot water heated by a heating source and hot water stored in a hot water storage tank, and controlling the switching means when hot water is supplied, Either hot water or hot water storage hot water is used as the primary side of the heat exchanger for hot water supply It comprises a control unit for switching on the basis whether to introduce the road to the target hot-water supply temperature, the.

本発明によれば、加熱対象水として高硬度水が使用される場合でも、給湯用熱交換器にスケールが付着及び堆積するのを抑制することができる。従って、給湯用熱交換器の熱伝導効率及び給湯流量を長期間にわたって良好に維持し、貯湯式給湯機の寿命を延ばすことができる。   ADVANTAGE OF THE INVENTION According to this invention, even when high hardness water is used as heating object water, it can suppress that a scale adheres and deposits on the heat exchanger for hot water supply. Therefore, the heat conduction efficiency and the hot water flow rate of the hot water heat exchanger can be maintained well over a long period of time, and the life of the hot water storage type hot water heater can be extended.

本発明の実施の形態1によるヒートポンプ式給湯機を示す構成図である。It is a block diagram which shows the heat pump type water heater by Embodiment 1 of this invention. 本発明の実施の形態1において、貯湯運転を示す動作説明図である。In Embodiment 1 of this invention, it is operation | movement explanatory drawing which shows a hot water storage driving | operation. 本発明の実施の形態1において、貯湯利用給湯運転を示す動作説明図である。In Embodiment 1 of this invention, it is operation | movement explanatory drawing which shows the hot water storage utilization hot water supply driving | operation. 本発明の実施の形態1において、加熱利用給湯運転を示す動作説明図である。In Embodiment 1 of this invention, it is operation | movement explanatory drawing which shows a heating utilization hot water supply driving | operation. 本発明の実施の形態2によるヒートポンプ式給湯機を示す構成図である。It is a block diagram which shows the heat pump type water heater by Embodiment 2 of this invention. 本発明の実施の形態2において、給湯流量の脈動制御を示す特性線図である。In Embodiment 2 of this invention, it is a characteristic diagram which shows the pulsation control of the hot water supply flow volume. 本発明の実施の形態3によるヒートポンプ式給湯機を示す構成図である。It is a block diagram which shows the heat pump type water heater by Embodiment 3 of this invention. 本発明の実施の形態3において、湯水のpH及びカルシウム硬度と、スケールの析出傾向との関係を例示する特性線図である。In Embodiment 3 of this invention, it is a characteristic diagram which illustrates the relationship between pH and calcium hardness of hot water, and the precipitation tendency of a scale.

以下、図面を参照して、本発明の実施の形態について説明する。なお、本明細書で使用する各図においては、共通する要素に同一の符号を付し、重複する説明を省略するものとする。また、本発明は、以下の実施の形態に限定されるものではなく、本発明の主旨を逸脱しない範囲で種々に変形することが可能である。また、本発明は、以下の各実施の形態に示す構成のうち、組合わせ可能な構成のあらゆる組合わせを含むものである。また、実施の形態では、貯湯式給湯機の一例として、ヒートポンプ式給湯機を記載している。   Embodiments of the present invention will be described below with reference to the drawings. In each drawing used in this specification, common elements are denoted by the same reference numerals, and redundant description is omitted. Further, the present invention is not limited to the following embodiments, and can be variously modified without departing from the gist of the present invention. Further, the present invention includes all combinations of configurations that can be combined among the configurations shown in the following embodiments. Moreover, in embodiment, the heat pump type water heater is described as an example of the hot water storage type water heater.

実施の形態1.
図1は、本発明の実施の形態1によるヒートポンプ式給湯機を示す構成図である。この図に示すように、本実施の形態のヒートポンプ式給湯機は、室外に配置されるヒートポンプユニット1と、室内に配置されるタンクユニット2とを備えている。ヒートポンプユニット1は、後述の貯湯タンク8及び水源から供給される湯水を加熱する(沸上げる)加熱源であり、圧縮機3、水加熱用熱交換器4、膨張弁5及び蒸発器6を冷媒配管7により環状に接続したヒートポンプサイクルを備えている。冷媒配管7を循環する冷媒としては、例えば自然冷媒である二酸化炭素が用いられる。なお、本明細書では、温水(湯)及び水を総称して「湯水」と表記する場合がある。また、本明細書では、ヒートポンプユニット1により加熱された温水を「加熱温水」と表記し、貯湯タンク8に貯留された温水を「貯湯温水」と表記し、後述する給湯用熱交換器16の2次側流路から給湯対象に向けて流出する温水を「給湯温水」と表記する場合がある。
Embodiment 1 FIG.
FIG. 1 is a configuration diagram showing a heat pump type hot water heater according to Embodiment 1 of the present invention. As shown in this figure, the heat pump type water heater of the present embodiment includes a heat pump unit 1 arranged outside the room and a tank unit 2 arranged inside the room. The heat pump unit 1 is a heating source for heating (boiling) hot water supplied from a hot water storage tank 8 and a water source, which will be described later, and the compressor 3, the water heating heat exchanger 4, the expansion valve 5 and the evaporator 6 are used as refrigerant. A heat pump cycle connected in a ring shape by a pipe 7 is provided. For example, carbon dioxide, which is a natural refrigerant, is used as the refrigerant circulating through the refrigerant pipe 7. In this specification, warm water (hot water) and water may be collectively referred to as “hot water”. Moreover, in this specification, the hot water heated by the heat pump unit 1 is referred to as “heating hot water”, the hot water stored in the hot water storage tank 8 is referred to as “hot water hot water”, and a hot water supply heat exchanger 16 described later is used. The hot water flowing out from the secondary channel toward the hot water supply target may be referred to as “hot water hot water”.

タンクユニット2には、貯湯タンク8、制御部9、送水ポンプ10、水加熱用往き配管11、水加熱用戻り配管12、流路切換弁13、給湯加熱用往き配管14、給湯加熱用戻り配管15、給湯用熱交換器16、逃がし弁17、取水弁18、水導入弁19、給水配管20、給湯配管22等が内蔵されている。貯湯タンク8は、ヒートポンプユニット1により加熱された加熱温水を貯湯するものである。貯湯タンク8の上部には、温水出入口8aが設けられ、貯湯タンク8の下部には、水導入口8b及び水導出口8cが設けられている。貯湯タンク8には、上部の温水出入口8aから加熱温水が導入され、下部の水導入口8bから水道水、井戸水等の低温水が導入される。これにより、貯湯タンク8の内部には、上部側ほど水温が高くなる温度成層が形成されている。また、貯湯タンク8の上部には、タンク内の圧力が過大となった場合に圧力を逃す逃がし弁17が接続されている。   The tank unit 2 includes a hot water storage tank 8, a control unit 9, a water pump 10, a water heating forward pipe 11, a water heating return pipe 12, a flow switching valve 13, a hot water heating forward pipe 14, and a hot water heating return pipe. 15, a hot water supply heat exchanger 16, a relief valve 17, a water intake valve 18, a water introduction valve 19, a water supply pipe 20, a hot water supply pipe 22, and the like are incorporated. The hot water storage tank 8 stores hot water heated by the heat pump unit 1. A hot water inlet / outlet 8 a is provided in the upper part of the hot water storage tank 8, and a water inlet 8 b and a water outlet 8 c are provided in the lower part of the hot water tank 8. Heated hot water is introduced into the hot water storage tank 8 from the upper hot water inlet / outlet 8a, and cold water such as tap water and well water is introduced from the lower water inlet 8b. As a result, a temperature stratification is formed in the hot water storage tank 8 so that the water temperature increases toward the upper side. Further, a relief valve 17 is connected to the upper part of the hot water storage tank 8 to release the pressure when the pressure in the tank becomes excessive.

水加熱用往き配管11は、一端が水加熱用熱交換器4の2次側流入口に接続され、他端が後述の取水配管15aを介して貯湯タンク8の水導出口8cに接続されている。水加熱用往き配管11の途中には、水加熱用熱交換器4に近い方から順に、水導入弁19、送水ポンプ10及び取水弁18が設けられている。また、貯湯タンク8の水導入口8bと水導入弁19とは、タンク戻り配管11aを介して互いに接続されている。送水ポンプ10は、後述の貯湯回路、貯湯温水循環回路及び加熱温水循環回路に湯水を循環させるためのポンプである。一方、水加熱用戻り配管12は、一端が水加熱用熱交換器4の2次側流出口に接続され、他端がタンク上部配管12aを介して貯湯タンク8の温水出入口8aに接続されている。水加熱用戻り配管12とタンク上部配管12aとの間には、流路切換弁13が設けられている。   One end of the water heating forward pipe 11 is connected to the secondary inlet of the water heating heat exchanger 4, and the other end is connected to a water outlet 8c of the hot water storage tank 8 via a water intake pipe 15a described later. Yes. A water introduction valve 19, a water feed pump 10, and a water intake valve 18 are provided in the middle of the water heating forward pipe 11 in order from the side closer to the water heating heat exchanger 4. Further, the water introduction port 8b of the hot water storage tank 8 and the water introduction valve 19 are connected to each other via a tank return pipe 11a. The water supply pump 10 is a pump for circulating hot water in a hot water storage circuit, a hot water storage hot water circulation circuit, and a heating hot water circulation circuit described later. On the other hand, one end of the water heating return pipe 12 is connected to the secondary outlet of the water heating heat exchanger 4, and the other end is connected to the hot water inlet / outlet 8a of the hot water storage tank 8 via the tank upper pipe 12a. Yes. A flow path switching valve 13 is provided between the water heating return pipe 12 and the tank upper pipe 12a.

流路切換弁13は、3個のポートを有する電磁式の三方弁等により構成されている。流路切換弁13の各ポートには、水加熱用戻り配管12、タンク上部配管12a及び給湯加熱用往き配管14がそれぞれ接続されている。そして、流路切換弁13は、水加熱用戻り配管12とタンク上部配管12aとを連通する第1の流路形態と、タンク上部配管12aと給湯加熱用往き配管14とを連通する第2の流路形態と、水加熱用戻り配管12と給湯加熱用往き配管14とを連通する第3の流路形態とからなる3つの流路形態の何れかに切換えられる。給湯加熱用往き配管14は、流路切換弁13と給湯用熱交換器16の1次側流入口とを接続している。給湯加熱用戻り配管15は、給湯用熱交換器16の1次側流出口と取水弁18とを接続している。取水弁18と貯湯タンク8の水導出口8cとは、取水配管15aを介して互いに接続されている。   The flow path switching valve 13 is configured by an electromagnetic three-way valve having three ports. A water heating return pipe 12, a tank upper pipe 12a, and a hot water heating forward pipe 14 are connected to each port of the flow path switching valve 13, respectively. The flow path switching valve 13 is connected to the first flow path form for communicating the water heating return pipe 12 and the tank upper pipe 12a, and the second flow path for communicating the tank upper pipe 12a and the hot water supply heating forward pipe 14. The flow path is switched to any one of three flow path forms including a flow path form and a third flow path form that communicates the water heating return pipe 12 and the hot water heating forward pipe 14. The hot water supply heating forward pipe 14 connects the flow path switching valve 13 and the primary side inlet of the hot water supply heat exchanger 16. The hot water heating return pipe 15 connects the primary outlet of the hot water heat exchanger 16 and the intake valve 18. The intake valve 18 and the water outlet 8c of the hot water storage tank 8 are connected to each other via an intake pipe 15a.

給湯用熱交換器16は、ヒートポンプユニット1及び貯湯タンク8から温水が導入される1次側流路と、加熱対象水となる低温水が給水配管20から導入される2次側流路とを有している。そして、給湯用熱交換器16は、1次側流路と2次側流路との間で熱交換を行うことにより、加熱温水及び貯湯温水を熱源として加熱対象水を加熱し、給湯温水を生成するものである。給水配管20は、外部の水源(図示せず)からタンクユニット2に低温水を供給するものであり、一端側が水源に接続されている。給水配管20の他端側は、タンクユニット2の内部で分岐し、給湯用熱交換器16の2次側流入口及び水導入弁19にそれぞれ接続されている。給水配管20の途中には、貯湯タンク8に導入する低温水の圧力を調整する減圧弁21が設けられている。一方、給湯用熱交換器16の2次側流出口には、給湯配管22が接続されている。給湯配管22は、給湯用熱交換器16により加熱された給湯温水を外部の給湯対象(図示せず)に供給するものである。給湯対象としては、例えばシャワー、カラン等の給湯栓、浴槽、温水暖房機等が挙げられる。   The hot water supply heat exchanger 16 includes a primary side flow path through which hot water is introduced from the heat pump unit 1 and the hot water storage tank 8, and a secondary side flow path through which low temperature water to be heated is introduced from the water supply pipe 20. Have. The hot water supply heat exchanger 16 heats the heating target water using the heated hot water and the hot water storage hot water as a heat source by exchanging heat between the primary side flow path and the secondary side flow path. Is to be generated. The water supply pipe 20 supplies low-temperature water to the tank unit 2 from an external water source (not shown), and one end side is connected to the water source. The other end of the water supply pipe 20 branches inside the tank unit 2 and is connected to the secondary inlet and the water introduction valve 19 of the hot water supply heat exchanger 16. A pressure reducing valve 21 that adjusts the pressure of the low-temperature water introduced into the hot water storage tank 8 is provided in the middle of the water supply pipe 20. On the other hand, a hot water supply pipe 22 is connected to the secondary outlet of the hot water supply heat exchanger 16. The hot water supply pipe 22 supplies hot water supply hot water heated by the hot water supply heat exchanger 16 to an external hot water supply target (not shown). Examples of hot water supply objects include hot water taps such as showers and currants, bathtubs, hot water heaters, and the like.

取水弁18は、3個のポートを有する電磁式の三方弁等により構成されている。取水弁18の各ポートには、水加熱用往き配管11、給湯加熱用戻り配管15及び取水配管15aがそれぞれ接続されている。そして、取水弁18は、水加熱用往き配管11と給湯加熱用戻り配管15とを連通する第1の流路形態と、水加熱用往き配管11と取水配管15aとを連通する第2の流路形態とからなる2つの流路形態の何れかに切換えられる。水導入弁19は、4個のポートを有する電磁式の四方弁等により構成されている。水導入弁19の各ポートには、水加熱用往き配管11の一端側(ヒートポンプユニット1側)、水加熱用往き配管11の他端側(給湯用熱交換器16側)、タンク戻り配管11a及び給水配管20がそれぞれ接続されている。そして、水導入弁19は、水加熱用往き配管11の一端側と他端側とを連通する第1の流路形態と、水加熱用往き配管11の他端側とタンク戻り配管11aとを連通する第2の流路形態と、給水配管20とタンク戻り配管11aとを連通する第3の流路形態(貯湯タンク8への給水時に利用)とからなる3つの流路形態の何れかに切換えられる。   The intake valve 18 is constituted by an electromagnetic three-way valve having three ports. To each port of the water intake valve 18, a water heating forward pipe 11, a hot water supply heating return pipe 15 and a water intake pipe 15 a are respectively connected. The intake valve 18 has a first flow path configuration that communicates the water heating forward pipe 11 and the hot water supply heating return pipe 15, and a second flow path that communicates the water heating forward pipe 11 and the intake pipe 15 a. It is switched to one of two flow path forms consisting of a path form. The water introduction valve 19 is configured by an electromagnetic four-way valve having four ports. Each port of the water introduction valve 19 includes one end side of the water heating forward pipe 11 (on the heat pump unit 1 side), the other end side of the water heating forward pipe 11 (on the side of the hot water supply heat exchanger 16), and a tank return pipe 11a. And a water supply pipe 20 are connected to each other. And the water introduction valve 19 connects the 1st flow path form which connects the one end side of the water heating forward piping 11, and the other end side, the other end side of the water heating forward piping 11, and the tank return piping 11a. One of the three flow path forms consisting of a second flow path form that communicates and a third flow path form that communicates the water supply pipe 20 and the tank return pipe 11a (used when water is supplied to the hot water storage tank 8). Switched.

ヒートポンプ式給湯機は、上述した流路切換弁13、取水弁18及び水導入弁19の流路形態の組合わせに応じて、後述の貯湯回路、貯湯温水循環回路及び加熱温水循環回路を形成する。そして、給湯時には、貯湯温水循環回路と加熱温水循環回路の何れを選択するかによって、給湯用熱交換器16の1次側流路に導入される温水を加熱温水と貯湯温水の何れか一方に切換える。従って、流路切換弁13、取水弁18及び水導入弁19は、本実施の形態における切換手段の具体例を構成している。   The heat pump hot water heater forms a hot water storage circuit, a hot water hot water circulation circuit, and a heated hot water circulation circuit, which will be described later, according to the combination of the flow path forms of the flow path switching valve 13, the intake valve 18 and the water introduction valve 19 described above. . When hot water is supplied, hot water introduced into the primary flow path of the hot water supply heat exchanger 16 is changed to either heated hot water or hot water storage hot water depending on whether the hot water storage hot water circulation circuit or the heating hot water circulation circuit is selected. Switch. Therefore, the flow path switching valve 13, the intake valve 18 and the water introduction valve 19 constitute a specific example of the switching means in the present embodiment.

次に、ヒートポンプ式給湯機の制御系統について説明する。本実施の形態のヒートポンプ式給湯機は、タンクユニット2に内蔵された制御部9と、リモコン40とを備えている。制御部9は、ヒートポンプ式給湯機を制御するもので、マイクロコンピュータ等により構成され、制御プログラム等が予め記憶された記憶回路と、前記制御プログラムに基いて演算を行う演算処理装置(CPU)と、信号の入出力を行う入出力ポートとを備えている。入出力ポートには、ヒートポンプ式給湯機に搭載された各種のセンサを含むセンサ系統と、圧縮機3、送水ポンプ10、流路切換弁13、取水弁18、水導入弁19等を含む各種のアクチュエータとが接続されている。センサ系統には、タンク温度センサ30、出湯温度センサ31、給湯流量センサ32等が含まれている。   Next, a control system of the heat pump type hot water heater will be described. The heat pump type water heater of the present embodiment includes a control unit 9 built in the tank unit 2 and a remote controller 40. The control unit 9 controls the heat pump type hot water heater, and is constituted by a microcomputer or the like, a storage circuit in which a control program or the like is stored in advance, and an arithmetic processing unit (CPU) that performs an operation based on the control program. And an input / output port for inputting and outputting signals. The input / output port includes a sensor system including various sensors mounted on a heat pump type hot water heater, and various types including a compressor 3, a water supply pump 10, a flow path switching valve 13, a water intake valve 18, a water introduction valve 19, and the like. The actuator is connected. The sensor system includes a tank temperature sensor 30, a tapping temperature sensor 31, a hot water supply flow rate sensor 32, and the like.

タンク温度センサ30は、貯湯タンク8の表面の互いに異なる高さ位置に複数個取付けられている。制御部9は、タンク温度センサ30の検出結果に基いて貯湯タンク8内の温度分布を検出し、貯湯タンク8に貯湯された温水の量(貯湯量)を算出することができる。また、出湯温度センサ31は、ヒートポンプユニット1の水加熱用熱交換器4から流出する湯水(加熱温水)の温度を検出する。給湯流量センサ32は、給湯用熱交換器16の2次側流路を流通する湯水の流量、即ち、給湯温水の量を検出するものである。また、リモコン40は、例えば台所、浴室等に設置され、ユーザにより操作されるもので、制御部9と相互通信可能に接続されている。   A plurality of tank temperature sensors 30 are mounted at different height positions on the surface of the hot water storage tank 8. The controller 9 can detect the temperature distribution in the hot water storage tank 8 based on the detection result of the tank temperature sensor 30 and can calculate the amount of hot water stored in the hot water storage tank 8 (hot water storage amount). The hot water temperature sensor 31 detects the temperature of hot water (heating hot water) flowing out from the water heating heat exchanger 4 of the heat pump unit 1. The hot water supply flow rate sensor 32 detects the flow rate of hot water flowing through the secondary flow path of the hot water supply heat exchanger 16, that is, the amount of hot water supply hot water. The remote controller 40 is installed in, for example, a kitchen or bathroom, and is operated by a user, and is connected to the control unit 9 so as to be able to communicate with each other.

リモコン40は、ヒートポンプ式給湯機に対する運転指令を入力したり、各種の設定値の変更等を行うもので、ユーザが操作する操作部と、各種の情報を表示する表示部とを備えている。リモコン40により変更可能な設定値には、給湯用熱交換器16の2次側流路から給湯対象に向けて流出する給湯温水の目標温度である目標給湯温度が含まれている。即ち、リモコン40は、本実施の形態の目標温度設定手段に相当している。制御部9は、センサ系統及びリモコン40からの入力情報に基いてアクチュエータを駆動することにより、ヒートポンプ式給湯機を制御し、貯湯運転、貯湯利用給湯運転、加熱利用給湯運転及び熱源切換制御を実行する。以下、これらの運転及び制御について説明する。   The remote controller 40 inputs an operation command for the heat pump type hot water heater or changes various setting values, and includes an operation unit operated by a user and a display unit for displaying various information. The set value that can be changed by the remote controller 40 includes a target hot water temperature that is a target temperature of hot water and hot water flowing out from the secondary side flow path of the hot water supply heat exchanger 16 toward the hot water supply target. That is, the remote controller 40 corresponds to the target temperature setting means of the present embodiment. The control unit 9 controls the heat pump type hot water heater by driving the actuator based on input information from the sensor system and the remote controller 40, and executes hot water storage operation, hot water storage hot water supply operation, heating hot water supply operation, and heat source switching control. To do. Hereinafter, these operations and controls will be described.

(貯湯運転)
図2は、本発明の実施の形態1において、貯湯運転を示す動作説明図である。この図に示すように、貯湯運転では、ヒートポンプユニット1により加熱した加熱温水を貯湯タンク8に貯留する。貯湯運転時には、流路切換弁13を第1の流路形態に切換え、取水弁18を第2の流路形態に切換えると共に、水導入弁19を第1の流路形態に切換える。これにより、ヒートポンプユニット1と貯湯タンク8との間には、図2に示す貯湯回路が形成される。貯湯回路は、貯湯タンク8の水導出口8cから取水配管15a、取水弁18、送水ポンプ10、水導入弁19及び水加熱用往き配管11を順次経由して水加熱用熱交換器4の2次側流路に到達し、この2次側流路を通過してから、水加熱用戻り配管12、流路切換弁13、タンク上部配管12aを順次経由して貯湯タンク8の温水出入口8aに到達する循環流路である。
(Hot water storage operation)
FIG. 2 is an operation explanatory view showing a hot water storage operation in Embodiment 1 of the present invention. As shown in this figure, in the hot water storage operation, heated hot water heated by the heat pump unit 1 is stored in the hot water storage tank 8. During the hot water storage operation, the flow path switching valve 13 is switched to the first flow path configuration, the intake valve 18 is switched to the second flow path configuration, and the water introduction valve 19 is switched to the first flow path configuration. Thereby, a hot water storage circuit shown in FIG. 2 is formed between the heat pump unit 1 and the hot water storage tank 8. The hot water storage circuit passes through the water outlet 8c of the hot water storage tank 8 through the water intake pipe 15a, the water intake valve 18, the water pump 10, the water introduction valve 19 and the water heating forward pipe 11 in order of the water heating heat exchanger 4 2. After reaching the secondary flow path and passing through the secondary flow path, the water heating return pipe 12, the flow switching valve 13, and the tank upper pipe 12a are sequentially passed to the hot water inlet / outlet 8a of the hot water storage tank 8. It is a circulation channel that reaches.

貯湯運転では、このように貯湯回路を形成した状態で、ヒートポンプユニット1及び送水ポンプ10を作動させる。これにより、貯湯タンク8の下部に滞留する低温水が貯湯回路を介してヒートポンプユニット1に導入され、ヒートポンプユニット1により加熱される。そして、ヒートポンプユニット1から流出した加熱温水は、貯湯回路を介して貯湯タンク8の上部に流入する。従って、貯湯タンク8に温水を貯湯することができる。   In the hot water storage operation, the heat pump unit 1 and the water pump 10 are operated with the hot water storage circuit formed as described above. As a result, the low-temperature water staying in the lower part of the hot water storage tank 8 is introduced into the heat pump unit 1 through the hot water storage circuit and is heated by the heat pump unit 1. The heated hot water flowing out of the heat pump unit 1 flows into the upper portion of the hot water storage tank 8 through the hot water storage circuit. Therefore, hot water can be stored in the hot water storage tank 8.

(貯湯利用給湯運転)
図3は、本発明の実施の形態1において、貯湯利用給湯運転を示す動作説明図である。貯湯利用給湯運転では、給湯動作が行われたときに、貯湯タンク8に貯留された貯湯温水を熱源として加熱対象水を加熱し、給湯対象に温水を供給する。ここで、ユーザが給湯栓を開いたり、浴槽を含む温水利用機器への給湯が開始された場合には、給水配管20に加わっている水圧により給湯配管22に水流が生じる。制御部9は、この水流を給湯流量センサ32により給湯動作として検出する。給湯動作時には、水源から供給される加熱対象水が給湯回路を流通する。給湯回路は、水源から給水配管20、給湯用熱交換器16の2次側流路及び給湯配管22を順次経由して給湯対象に到達する流路である。
(Hot water supply operation using hot water storage)
FIG. 3 is an operation explanatory diagram showing a hot water storage hot water supply operation in Embodiment 1 of the present invention. In the hot water storage hot water supply operation, when a hot water supply operation is performed, the hot water stored in the hot water storage tank 8 is used as a heat source to heat the water to be heated, and the hot water is supplied to the hot water supply target. Here, when the user opens the hot water tap or starts hot water supply to the hot water use device including the bathtub, a water flow is generated in the hot water supply pipe 22 due to the water pressure applied to the water supply pipe 20. The controller 9 detects this water flow as a hot water supply operation by the hot water supply flow rate sensor 32. During the hot water supply operation, the water to be heated supplied from the water source flows through the hot water supply circuit. The hot water supply circuit is a flow path that reaches the target of hot water supply from the water source via the water supply pipe 20, the secondary flow path of the hot water supply heat exchanger 16 and the hot water supply pipe 22 in order.

貯湯利用給湯運転では、図3に示すように、流路切換弁13を第2の流路形態に切換え、取水弁18を第1の流路形態に切換えると共に、水導入弁19を第2の流路形態に切換える。これにより、貯湯タンク8と給湯用熱交換器16との間には、貯湯温水循環回路が形成される。貯湯温水循環回路は、貯湯タンク8の温水出入口8aからタンク上部配管12a、流路切換弁13、給湯加熱用往き配管14、給湯用熱交換器16の1次側流路、給湯加熱用戻り配管15、取水弁18、送水ポンプ10、水導入弁19及びタンク戻り配管11aを順次経由して、貯湯タンク8の水導入口8bに到達する循環流路である。   In the hot water storage hot water supply operation, as shown in FIG. 3, the flow path switching valve 13 is switched to the second flow path configuration, the intake valve 18 is switched to the first flow path configuration, and the water introduction valve 19 is switched to the second flow path configuration. Switch to flow channel configuration. Thereby, a hot water storage hot water circulation circuit is formed between the hot water storage tank 8 and the hot water supply heat exchanger 16. The hot water storage hot water circulation circuit includes a hot water inlet / outlet 8a of the hot water storage tank 8 and a tank upper pipe 12a, a flow path switching valve 13, a hot water heating forward pipe 14, a primary flow path of the hot water heat exchanger 16, and a hot water heating return pipe. 15, a circulation passage that reaches the water introduction port 8 b of the hot water storage tank 8 through the water intake valve 18, the water pump 10, the water introduction valve 19, and the tank return pipe 11 a in this order.

貯湯利用給湯運転では、このように貯湯温水循環回路を形成した状態で、送水ポンプ10を作動させる。これにより、貯湯タンク8の上部に滞留する高温水が貯湯温水循環回路を介して給湯用熱交換器16の1次側流路に導入される。この高温水は、給湯用熱交換器16の2次側流路を流れる加熱対象水と熱交換を行った後に、貯湯温水循環回路を介して貯湯タンク8の下部に戻される。この結果、水源から供給される低温水は、給湯回路を流通するときに、給湯用熱交換器16により加熱されて温水(給湯温水)となり、この給湯温水は、給湯回路により給湯対象に供給される。従って、貯湯温水を熱源として給湯を行うことができる。なお、図示は省略するが、給湯配管22には、給湯温水に対して低温水を混合することにより所望温度の温水を生成する温度調整機構を設けてもよい。   In the hot water storage hot water supply operation, the water supply pump 10 is operated in such a state that the hot water storage hot water circulation circuit is formed. Thereby, the high temperature water which retains in the upper part of the hot water storage tank 8 is introduce | transduced into the primary side flow path of the hot water supply heat exchanger 16 through the hot water storage hot water circulation circuit. This high-temperature water is returned to the lower part of the hot water storage tank 8 through the hot water storage hot water circulation circuit after exchanging heat with the water to be heated flowing in the secondary flow path of the hot water supply heat exchanger 16. As a result, the low temperature water supplied from the water source is heated by the hot water supply heat exchanger 16 to become hot water (hot water supply hot water) when flowing through the hot water supply circuit, and this hot water supply hot water is supplied to the hot water supply target by the hot water supply circuit. The Therefore, hot water can be supplied using the hot water storage hot water as a heat source. In addition, although illustration is abbreviate | omitted, you may provide the temperature adjustment mechanism in the hot water supply piping 22 which produces | generates hot water of desired temperature by mixing low temperature water with hot water supply hot water.

(加熱利用給湯運転)
図4は、本発明の実施の形態1において、加熱利用給湯運転を示す動作説明図である。加熱利用給湯運転では、給湯動作が行われたときに、ヒートポンプユニット1により加熱した加熱温水を熱源として加熱対象水を加熱し、給湯対象に温水を供給する。詳しく述べると、加熱利用給湯運転では、図4に示すように、流路切換弁13を第3の流路形態に切換え、取水弁18を第1の流路形態に切換えると共に、水導入弁19を第1の流路形態に切換える。これにより、ヒートポンプユニット1と給湯用熱交換器16との間には、加熱温水循環回路が形成される。加熱温水循環回路は、ヒートポンプユニット1の水加熱用熱交換器4の2次側流路から水加熱用戻り配管12、流路切換弁13、給湯加熱用往き配管14、給湯用熱交換器16の1次側流路、給湯加熱用戻り配管15、取水弁18、送水ポンプ10、水導入弁19及び水加熱用往き配管11を順次経由して、水加熱用熱交換器4の2次側流路に戻る循環流路である。
(Heating hot water supply operation)
FIG. 4 is an operation explanatory diagram showing a heating-use hot water supply operation in Embodiment 1 of the present invention. In the hot water supply operation using heating, when a hot water supply operation is performed, the heating target water is heated using the heated hot water heated by the heat pump unit 1 as a heat source and the hot water is supplied to the hot water supply target. More specifically, in the heating hot water supply operation, as shown in FIG. 4, the flow path switching valve 13 is switched to the third flow path configuration, the intake valve 18 is switched to the first flow path configuration, and the water introduction valve 19 is switched. Is switched to the first flow path configuration. Thereby, a heating hot water circulation circuit is formed between the heat pump unit 1 and the hot water supply heat exchanger 16. The heated hot water circulation circuit includes a water heating return pipe 12, a flow path switching valve 13, a hot water heating forward pipe 14, and a hot water heat exchanger 16 from the secondary side flow path of the water heating heat exchanger 4 of the heat pump unit 1. The secondary side of the water heating heat exchanger 4 passes through the primary side flow path, the hot water heating return pipe 15, the intake valve 18, the water pump 10, the water introduction valve 19 and the water heating forward pipe 11 in order. It is a circulation channel which returns to a channel.

加熱利用給湯運転では、このように加熱温水循環回路を形成した状態で、ヒートポンプユニット1及び送水ポンプ10を作動させる。この結果、ヒートポンプユニット1により加熱された高温水が加熱温水循環回路を介して給湯用熱交換器16の1次側流路に導入される。この高温水は、給湯用熱交換器16の2次側流路を流れる加熱対象水と熱交換を行った後に、加熱温水循環回路を介してヒートポンプユニット1に戻される。従って、加熱温水を熱源として給湯を行うことができる。   In the heating hot water supply operation, the heat pump unit 1 and the water pump 10 are operated with the heated hot water circulation circuit formed as described above. As a result, the high temperature water heated by the heat pump unit 1 is introduced into the primary flow path of the hot water supply heat exchanger 16 through the heated hot water circulation circuit. This high-temperature water is returned to the heat pump unit 1 through the heated hot water circulation circuit after exchanging heat with the water to be heated flowing in the secondary-side flow path of the hot water supply heat exchanger 16. Therefore, hot water can be supplied using the heated hot water as a heat source.

なお、給湯流量センサ32により水流の停止が検出された場合には、上述した貯湯利用給湯運転及び加熱利用給湯運転が終了される。この場合には、ヒートポンプユニット1、送水ポンプ10等が停止されると共に、流路切換弁13、取水弁18及び水導入弁19を貯湯運転時の流路形態に切換える。   In addition, when the stop of a water flow is detected by the hot water supply flow rate sensor 32, the above-described hot water storage hot water supply operation and heating hot water supply operation are ended. In this case, the heat pump unit 1, the water pump 10 and the like are stopped, and the flow path switching valve 13, the water intake valve 18 and the water introduction valve 19 are switched to the flow path configuration during hot water storage operation.

(熱源切換制御)
次に、給湯時の熱源を加熱温水と貯湯温水の何れかに切換える熱源切換制御について説明する。熱源切換制御は、給湯を行うときに、目標給湯温度に基いて貯湯利用給湯運転と加熱利用給湯運転の何れかを選択するものである。詳しく述べると、熱源切換制御では、加熱温水の温度が貯湯温水の温度よりも低い状態において、目標給湯温度が予め規定された温度基準値よりも低温に設定されている場合に、加熱利用給湯運転を実行する。一方、目標給湯温度が温度基準値以上の高温に設定されている場合には、貯湯利用給湯運転を実行する。なお、上述した温度基準値は、例えば加熱温水の温度と、貯湯温水の温度との間の温度として予め設定されている。
(Heat source switching control)
Next, heat source switching control for switching the heat source during hot water supply to either heated hot water or hot water storage hot water will be described. The heat source switching control selects either a hot water storage hot water supply operation or a heating hot water supply operation based on a target hot water supply temperature when performing hot water supply. More specifically, in the heat source switching control, when the temperature of the heated hot water is lower than the temperature of the hot water storage hot water and the target hot water temperature is set lower than a predetermined temperature reference value, the heating hot water supply operation is performed. Execute. On the other hand, when the target hot water supply temperature is set to a high temperature equal to or higher than the temperature reference value, a hot water storage hot water supply operation is executed. In addition, the temperature reference value mentioned above is preset as a temperature between the temperature of heating hot water and the temperature of hot water storage hot water, for example.

具体例として、例えば貯湯タンク8の上部側に60℃以上の高温水が貯留され、ヒートポンプユニット1による沸上げ温度が50℃以下の状態を想定する。また、貯湯利用給湯運転と加熱利用給湯運転とを使い分けるための温度基準値は、45℃に設定されているものとする。この状態において、例えば食洗機等のように高温水を使用する機器を運転するために、または、ユーザが高温水を必要としているために、目標給湯温度が45℃以上の高温に設定されている場合には、給湯動作が行われたときに、図3に示す貯湯利用給湯運転を実行する。これにより、給湯用熱交換器16の1次側流路には、例えば60℃以上の貯湯温水が熱源として供給される。   As a specific example, for example, it is assumed that high-temperature water of 60 ° C. or higher is stored on the upper side of the hot water storage tank 8 and the boiling temperature by the heat pump unit 1 is 50 ° C. or lower. Further, it is assumed that the temperature reference value for properly using the hot water storage hot water supply operation and the heating hot water supply operation is set to 45 ° C. In this state, the target hot water supply temperature is set to a high temperature of 45 ° C. or higher in order to operate a device that uses high-temperature water, such as a dishwasher, or because the user needs high-temperature water. When the hot water supply operation is performed, the hot water storage use hot water supply operation shown in FIG. 3 is executed. Thereby, the hot water storage water of 60 degreeC or more is supplied to the primary side flow path of the hot water supply heat exchanger 16 as a heat source, for example.

一方、手洗い、シャワー等のように温度が比較的低い温水を使用するために、目標給湯温度が45℃未満の低温に設定されている場合には、給湯動作が行われたときに、図4に示す加熱利用給湯運転を実行する。これにより、給湯用熱交換器16の1次側流路には、例えば50℃以下の加熱温水が熱源として供給される。   On the other hand, when hot water supply operation is performed when the target hot water supply temperature is set to a low temperature of less than 45 ° C. in order to use hot water having a relatively low temperature such as hand washing and showering, FIG. The hot water supply operation shown in FIG. Thereby, for example, heated hot water of 50 ° C. or lower is supplied to the primary flow path of the hot water supply heat exchanger 16 as a heat source.

以上詳述した通り、本実施の形態によれば、目標給湯温度に応じて熱源を切換えることができる。これにより、貯湯タンク8に貯留された高温の貯湯温水が給湯用熱交換器16に常時供給されるのを抑制し、ヒートポンプユニット1から相対的に低温な加熱温水が給湯用熱交換器16に供給される機会を増加させることができる。このため、加熱対象水として高硬度水が使用される場合でも、給湯用熱交換器16にスケールが付着及び堆積するのを抑制することができる。従って、給湯用熱交換器16の熱伝導効率及び給湯流量を長期間にわたって良好に維持し、ヒートポンプ式給湯機の寿命を延ばすことができる。   As described in detail above, according to the present embodiment, the heat source can be switched according to the target hot water supply temperature. Thereby, the hot hot water hot water stored in the hot water storage tank 8 is prevented from being constantly supplied to the hot water supply heat exchanger 16, and the relatively low temperature heating hot water from the heat pump unit 1 is supplied to the hot water supply heat exchanger 16. The opportunity to be supplied can be increased. For this reason, even when high-hardness water is used as the heating target water, it is possible to prevent the scale from adhering to and accumulating on the hot water supply heat exchanger 16. Therefore, the heat conduction efficiency and the hot water supply flow rate of the hot water supply heat exchanger 16 can be well maintained over a long period of time, and the life of the heat pump type hot water heater can be extended.

実施の形態2.
次に、図5及び図6を参照して、本発明の実施の形態2について説明する。本実施の形態の特徴は、給湯温水の流量を調整する流量調整手段を備えることにある。図5は、本発明の実施の形態2によるヒートポンプ式給湯機を示す構成図である。この図に示すように、本実施の形態のヒートポンプ式給湯機は、前記実施の形態1とほぼ同様に構成されているものの、給水配管20のうち給湯用熱交換器16の2次側流入口に接続された部位には、流量調整手段としての流量調整弁33が設けられている。流量調整弁33は、制御部9により制御されることにより、給湯用熱交換器16の2次側流路を流通する湯水の流量を調整するもので、給湯流量センサ32よりも上流側(水源側)に配置されている。
Embodiment 2. FIG.
Next, a second embodiment of the present invention will be described with reference to FIGS. The feature of the present embodiment is that it includes a flow rate adjusting means for adjusting the flow rate of hot water supply hot water. FIG. 5 is a configuration diagram showing a heat pump type water heater according to Embodiment 2 of the present invention. As shown in this figure, the heat pump type water heater of the present embodiment is configured in substantially the same manner as in the first embodiment, but the secondary side inlet of the heat exchanger 16 for hot water supply in the water supply pipe 20. A flow rate adjusting valve 33 as a flow rate adjusting means is provided at a portion connected to the. The flow rate adjustment valve 33 is controlled by the control unit 9 to adjust the flow rate of the hot water flowing through the secondary flow path of the hot water supply heat exchanger 16, and is upstream of the hot water supply flow rate sensor 32 (water source Side).

本実施の形態では、目標給湯温度が予め設定された制御開始温度以上である場合に、制御部9により脈動制御を実行する。図6は、本発明の実施の形態2において、給湯流量の脈動制御を示す特性線図である。この図に示すように、脈動制御では、給湯用熱交換器16の2次側流路を流通する湯水の流量、即ち、給湯流量を増加及び減少させる脈動動作を繰返すと共に、増加時の流量Aと減少時の流量Aとの流量差(A−A)を予め設定された脈動基準値以上に保持する。ここで、制御開始温度は、例えば給湯用熱交換器16の2次側流路中にスケールが析出し易くなる温度の最低値に応じて設定されている。また、脈動基準値は、脈動制御によりスケールの付着抑制効果が得られる流量差(A−A)の最小値に応じて設定されている。 In the present embodiment, the pulsation control is executed by the control unit 9 when the target hot water supply temperature is equal to or higher than a preset control start temperature. FIG. 6 is a characteristic diagram showing pulsation control of the hot water supply flow rate in the second embodiment of the present invention. As shown in this figure, in the pulsation control, the flow rate of hot water flowing through the secondary side flow path of the hot water supply heat exchanger 16, that is, the pulsation operation for increasing and decreasing the hot water supply flow rate is repeated, and the flow rate A at the time of increase is also shown. flow rate difference between the flow rate a when decreasing the H (a H -A) held above a preset pulsation reference value a. Here, the control start temperature is set, for example, in accordance with the minimum value of the temperature at which the scale easily precipitates in the secondary flow path of the hot water supply heat exchanger 16. Further, the pulsation reference value is set according to the minimum value of the flow rate difference (A H −A) at which a scale adhesion suppression effect is obtained by pulsation control.

脈動制御を実行する場合の具体例を挙げると、例えば高温水の給湯が必要であるために目標給湯温度が45℃以上の高温に設定されている場合において、給湯動作が行われたときには、前述のように、貯湯利用給湯運転を実行し、高温の貯湯温水を熱源として給湯を行う。このとき、制御部9は、流量調整弁33の開度を周期的に増加及び減少させることにより、脈動制御を実行する。この結果、給湯用熱交換器16の2次側流路内には、流量の脈動が加わるので、この脈動によりスケールの付着を抑制し、また、付着直後のスケールを剥離させることができる。なお、この具体例では、貯湯利用給湯運転と加熱利用給湯運転とを使い分けるための温度基準値と、脈動制御を開始するための制御開始温度とが等しく設定されている場合を例示した。しかし、本発明はこれに限らず、温度基準値と制御開始温度とを互いに異なる値に設定してもよい。   As a specific example of executing pulsation control, for example, when hot water supply operation is performed in a case where the target hot water supply temperature is set to a high temperature of 45 ° C. or higher because hot water supply is required, As shown, the hot water supply operation using hot water is performed, and hot water is supplied using hot hot water as a heat source. At this time, the control unit 9 executes pulsation control by periodically increasing and decreasing the opening degree of the flow rate adjustment valve 33. As a result, pulsation of the flow rate is applied to the secondary side flow path of the hot water supply heat exchanger 16, so that the adhesion of the scale can be suppressed by this pulsation and the scale immediately after the adhesion can be peeled off. In this specific example, the case where the temperature reference value for properly using the hot water storage hot water supply operation and the heating hot water supply operation is set equal to the control start temperature for starting the pulsation control is illustrated. However, the present invention is not limited to this, and the temperature reference value and the control start temperature may be set to different values.

このように構成される本実施の形態によれば、スケールの析出が生じ易い高温の熱源を用いて給湯を行う場合には、脈動制御を実行し、スケールの付着を抑制することができる。この結果、実施の形態1で述べた制御との相乗効果により、スケールの付着抑制効果を更に高めることができる。従って、給湯用熱交換器16の熱伝導効率及び給湯流量を長期間にわたって良好に維持し、ヒートポンプ式給湯機の寿命を延ばすことができる。   According to the present embodiment configured as described above, when hot water is supplied using a high-temperature heat source in which scale is likely to precipitate, pulsation control can be performed to suppress scale adhesion. As a result, the scale adhesion suppression effect can be further enhanced by a synergistic effect with the control described in the first embodiment. Therefore, the heat conduction efficiency and the hot water supply flow rate of the hot water supply heat exchanger 16 can be well maintained over a long period of time, and the life of the heat pump type hot water heater can be extended.

実施の形態3.
次に、図7及び図8を参照して、本発明の実施の形態3について説明する。本実施の形態の特徴は、前記実施の形態2の構成に加えて、水質測定手段を備えることにある。図7は、本発明の実施の形態3によるヒートポンプ式給湯機を示す構成図である。この図に示すように、本実施の形態のヒートポンプ式給湯機は、前記実施の形態2とほぼ同様に構成されているものの、給水配管20のうち給湯用熱交換器16の2次側流入口に接続された部位には、水質測定手段34が設けられている。水質測定手段34は、給湯用熱交換器16の2次側流路を流れる湯水の水質を測定するもので、例えばpH計、硬度計等により構成されている。
Embodiment 3 FIG.
Next, Embodiment 3 of the present invention will be described with reference to FIG. 7 and FIG. The feature of this embodiment is that a water quality measuring means is provided in addition to the configuration of the second embodiment. FIG. 7 is a configuration diagram showing a heat pump type water heater according to Embodiment 3 of the present invention. As shown in this figure, the heat pump type hot water heater of the present embodiment is configured in substantially the same manner as in the second embodiment, but the secondary side inlet of the heat exchanger 16 for hot water supply in the water supply pipe 20. The water quality measuring means 34 is provided in the part connected to. The water quality measuring means 34 measures the quality of the hot water flowing through the secondary flow path of the hot water supply heat exchanger 16, and is composed of, for example, a pH meter, a hardness meter, or the like.

制御部9は、給水配管20を流れる水の水質を水質測定手段34により常時監視し、例えば水質の測定結果をネットワーク経由で水質情報と照会することにより、スケールの析出傾向を判定する。そして、水質の測定結果に基いてスケールが析出し易いと判定した場合には、前述の脈動制御を実行する。スケールの析出傾向は、例えば図8に示すデータを用いて実行される。図8は、湯水のpH及びカルシウム硬度と、スケールの析出傾向との関係を例示する特性線図である。以下の説明では、図8中でスケール析出傾向が1より大きい領域を「スケール好発領域」と表記する。   The controller 9 constantly monitors the quality of the water flowing through the water supply pipe 20 by the water quality measurement means 34, and determines the scale precipitation tendency by, for example, inquiring the water quality measurement result with the water quality information via the network. And when it determines with a scale being easy to deposit based on the measurement result of water quality, the above-mentioned pulsation control is performed. The scale precipitation tendency is executed using, for example, data shown in FIG. FIG. 8 is a characteristic diagram illustrating the relationship between the pH and calcium hardness of hot water and the tendency of precipitation of scale. In the following description, a region where the scale precipitation tendency is larger than 1 in FIG. 8 is referred to as a “scale occurrence region”.

制御部9は、水質の測定結果がスケール好発領域に該当する場合に、スケールが析出し易い湯水であると判定する。この場合には、目標出湯温度が温度基準値(あるいは、制御開始温度)よりも低い温度に設定されていたとしても、前述の脈動制御を実行する。この結果、実施の形態2で述べた制御との相乗効果により、スケールの付着抑制効果を更に高めることができる。従って、給湯用熱交換器16の熱伝導効率及び給湯流量を長期間にわたって良好に維持し、ヒートポンプ式給湯機の寿命を延ばすことができる。   The control part 9 determines with the hot water from which a scale tends to precipitate, when the measurement result of a water quality corresponds to a scale frequent occurrence area | region. In this case, even if the target hot water temperature is set to a temperature lower than the temperature reference value (or control start temperature), the above-described pulsation control is executed. As a result, the scale adhesion suppression effect can be further enhanced by a synergistic effect with the control described in the second embodiment. Therefore, the heat conduction efficiency and the hot water supply flow rate of the hot water supply heat exchanger 16 can be well maintained over a long period of time, and the life of the heat pump type hot water heater can be extended.

なお、前記実施の形態1から3では、貯湯式給湯機として、ヒートポンプ式給湯機を例示したが、本発明はこれに限定されるものではない。即ち、本発明では、ヒートポンプユニット1に限らず、電熱式、燃料燃焼式等の加熱手段を用いてもよい。   In the first to third embodiments, the heat pump type hot water heater is exemplified as the hot water storage type hot water heater, but the present invention is not limited to this. That is, in the present invention, not only the heat pump unit 1 but also heating means such as an electric heating type and a fuel combustion type may be used.

1 ヒートポンプユニット(加熱源)
8 貯湯タンク
8a 温水出入口
8b 水導入口
8c 水導出口
9 制御部
10 送水ポンプ
13 流路切換弁(切換手段)
16 給湯用熱交換器
18 取水弁(切換手段)
19 水導入弁(切換手段)
20 給水配管
22 給湯配管
30 タンク温度センサ
31 出湯温度センサ
32 給湯流量センサ
33 流量調整弁(流量調整手段)
34 水質測定手段
40 リモコン(目標温度設定手段)
1 Heat pump unit (heating source)
8 Hot water storage tank 8a Hot water inlet / outlet 8b Water inlet 8c Water outlet 9 Control unit 10 Water pump 13 Flow path switching valve (switching means)
16 Heat exchanger for hot water supply 18 Water intake valve (switching means)
19 Water introduction valve (switching means)
20 Water supply piping 22 Hot water supply piping 30 Tank temperature sensor 31 Hot water temperature sensor 32 Hot water flow rate sensor 33 Flow rate adjustment valve (flow rate adjustment means)
34 Water quality measuring means 40 Remote control (target temperature setting means)

Claims (4)

湯水を加熱する加熱源と、
前記加熱源により加熱された温水を貯湯する貯湯タンクと、
前記加熱源及び前記貯湯タンクから温水が導入される1次側流路と加熱対象水が導入される2次側流路とを有し、前記1次側流路と前記2次側流路との間で熱交換を行うことにより前記加熱対象水を加熱する給湯用熱交換器と、
前記給湯用熱交換器の2次側流路から給湯対象に向けて流出する給湯温水の目標温度を目標給湯温度として設定する目標温度設定手段と、
前記給湯用熱交換器の1次側流路に導入される温水を、前記加熱源により加熱された加熱温水と前記貯湯タンクに貯湯された貯湯温水の何れか一方に切換えることが可能な切換手段と、
給湯を行うときに、前記切換手段を制御することにより、前記加熱温水と前記貯湯温水のうち何れの温水を前記給湯用熱交換器の1次側流路に導入するかを前記目標給湯温度に基いて切換える制御部と、
を備えた貯湯式給湯機。
A heating source for heating hot water,
A hot water storage tank for storing hot water heated by the heating source;
A primary-side channel into which hot water is introduced from the heating source and the hot water storage tank; and a secondary-side channel into which water to be heated is introduced; the primary-side channel and the secondary-side channel; A heat exchanger for hot water supply for heating the water to be heated by performing heat exchange between,
Target temperature setting means for setting, as a target hot water temperature, a target temperature of hot water hot water flowing out from the secondary-side flow path of the hot water supply heat exchanger toward the hot water supply target;
Switching means capable of switching the hot water introduced into the primary flow path of the heat exchanger for hot water supply to either one of the heated hot water heated by the heating source and the hot water stored in the hot water storage tank. When,
When the hot water is supplied, by controlling the switching means, which hot water of the heated hot water and the hot water storage hot water is introduced into the primary flow path of the hot water heat exchanger is set as the target hot water temperature. A control unit to switch based on,
Hot water storage water heater equipped with.
前記制御部は、前記加熱温水の温度が前記貯湯温水の温度よりも低い状態において、前記目標給湯温度が予め規定された温度基準値よりも低温に設定されている場合には、前記加熱温水を前記給湯用熱交換器の1次側流路に導入し、前記目標給湯温度が前記温度基準値以上の高温に設定されている場合には、前記貯湯温水を前記給湯用熱交換器の1次側流路に導入する請求項1に記載の貯湯式給湯機。   In a state where the temperature of the heated hot water is lower than the temperature of the hot water storage hot water, the controller is configured to supply the heated hot water when the target hot water supply temperature is set lower than a predetermined temperature reference value. When introduced into the primary flow path of the hot water supply heat exchanger and the target hot water supply temperature is set to a high temperature equal to or higher than the temperature reference value, the hot water storage hot water is used as the primary temperature of the hot water supply heat exchanger. The hot water storage type water heater according to claim 1, which is introduced into the side flow path. 前記給湯温水の流量を調整する流量調整手段を備え、
前記制御部は、前記流量調整手段により前記給湯温水の流量を増加及び減少させる動作を繰返すと共に増加時と減少時の流量差を予め設定された脈動基準値以上に保持する脈動制御の実行機能を有し、前記目標給湯温度が予め設定された制御開始温度以上である場合に、前記脈動制御を実行する請求項1または2に記載の貯湯式給湯機。
A flow rate adjusting means for adjusting the flow rate of the hot water supply hot water;
The control unit repeats the operation of increasing and decreasing the flow rate of the hot water hot water by the flow rate adjusting means, and has a pulsation control execution function for maintaining a flow rate difference between the increase and decrease at a predetermined pulsation reference value or more. The hot water storage type hot water supply apparatus according to claim 1 or 2, wherein the pulsation control is executed when the target hot water supply temperature is equal to or higher than a preset control start temperature.
前記給湯温水の流量を調整する流量調整手段と、
前記給湯用熱交換器の2次側流路を流れる湯水の水質を測定する水質測定手段と、
を備え、
前記制御部は、前記流量調整手段により前記給湯温水の流量を増加及び減少させる動作を繰返すと共に増加時と減少時の流量差を予め設定された脈動基準値以上に保持する脈動制御の実行機能を有し、前記水質測定手段の測定結果に基いて前記脈動制御を実行する請求項1または2に記載の貯湯式給湯機。
Flow rate adjusting means for adjusting the flow rate of the hot water supply hot water;
Water quality measuring means for measuring the quality of hot water flowing through the secondary flow path of the hot water supply heat exchanger;
With
The control unit repeats the operation of increasing and decreasing the flow rate of the hot water hot water by the flow rate adjusting means, and has a pulsation control execution function for maintaining a flow rate difference between the increase and decrease at a predetermined pulsation reference value or more. The hot water storage type hot water supply apparatus according to claim 1 or 2, wherein the pulsation control is executed based on a measurement result of the water quality measuring means.
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003044437A1 (en) * 2001-11-23 2003-05-30 Sung Sup Hong Heat-pump type hot water generator
JP2012255587A (en) * 2011-06-08 2012-12-27 Mitsubishi Electric Corp Hot water storage type water heater
WO2014155868A1 (en) * 2013-03-29 2014-10-02 三菱電機株式会社 Method for checking water quality, water quality checking device, and hot-water feeder system
JP2014222136A (en) * 2013-05-14 2014-11-27 三菱電機株式会社 Water heater

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003044437A1 (en) * 2001-11-23 2003-05-30 Sung Sup Hong Heat-pump type hot water generator
JP2012255587A (en) * 2011-06-08 2012-12-27 Mitsubishi Electric Corp Hot water storage type water heater
WO2014155868A1 (en) * 2013-03-29 2014-10-02 三菱電機株式会社 Method for checking water quality, water quality checking device, and hot-water feeder system
JP2014222136A (en) * 2013-05-14 2014-11-27 三菱電機株式会社 Water heater

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