JP7412238B2 - Water leak detection device for hot water supply system - Google Patents

Water leak detection device for hot water supply system Download PDF

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JP7412238B2
JP7412238B2 JP2020051188A JP2020051188A JP7412238B2 JP 7412238 B2 JP7412238 B2 JP 7412238B2 JP 2020051188 A JP2020051188 A JP 2020051188A JP 2020051188 A JP2020051188 A JP 2020051188A JP 7412238 B2 JP7412238 B2 JP 7412238B2
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弘明 長瀬
幸祐 中島
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Osaka Gas Co Ltd
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Description

本発明は、貯湯器を有する給湯システムの水漏れ判定装置に関する。 The present invention relates to a water leak determination device for a hot water supply system having a water storage device.

一般的に、台所や浴室等に設けられた温水消費装置に湯を供給する給湯システムは、給水配管から流入する水を給湯器により加熱して湯を生成する。この給湯システムの一形態として、給湯器の上流側に予め加温した湯を貯留する貯湯器を有する貯湯式給湯システムが知られており、出湯目標温度に基づいて予め加温した湯に水を加えて貯湯器の出湯配管から給湯器に供給し、必要に応じて熱交換器等により加熱して給湯する。この給湯システムにあっては、配管の継ぎ目からの水漏れ、配管の腐食による水漏れ、給湯を制御するバルブの動作不良による水漏れ等が発生することがある。 Generally, a hot water supply system that supplies hot water to a hot water consumption device installed in a kitchen, bathroom, etc. generates hot water by heating water that flows in from a water supply pipe with a water heater. As one form of this hot water supply system, a hot water storage type hot water supply system is known, which has a hot water storage device that stores preheated hot water upstream of the water heater, and water is added to the preheated hot water based on the target hot water temperature. In addition, hot water is supplied from the hot water outlet piping of the hot water storage device to the water heater, and is heated by a heat exchanger or the like as necessary. In this hot water supply system, water leakage may occur from joints of pipes, water leakage due to corrosion of the pipes, water leakage due to malfunction of valves that control hot water supply, and the like.

特許文献１には、給湯システムにおける少量の水漏れを判定することができる水漏れ判定装置が開示されている。特許文献１に記載の発明は、通常、給湯が停止した後に給湯が再開されると、給湯器内部の雰囲気温度により温められた給水配管には冷水が供給されて水温が低下するが、水漏れが発生している場合には給水配管中の水の流れが停止していないため、水温の変動量が小さくなる点に着目している。そこで、特許文献１に記載の水漏れ判定装置は、給湯を開始した後、給水配管の水温と給湯器外部の雰囲気温度との温度差が所定温度差以上であり、且つ、給水配管中の水温の変動量が所定値を下回る場合に水漏れが発生していると判定している。 Patent Document 1 discloses a water leak determination device that can determine a small amount of water leak in a hot water supply system. In the invention described in Patent Document 1, when hot water supply is restarted after being stopped, cold water is supplied to the water supply piping that has been warmed by the atmospheric temperature inside the water heater, and the water temperature decreases, but water leakage occurs. We are focusing on the fact that when this occurs, the flow of water in the water supply pipes has not stopped, so the amount of fluctuation in water temperature becomes smaller. Therefore, the water leakage determination device described in Patent Document 1 is designed such that after starting hot water supply, the temperature difference between the water temperature in the water supply pipe and the ambient temperature outside the water heater is equal to or more than a predetermined temperature difference, and the water temperature in the water supply pipe is It is determined that water leakage has occurred when the amount of variation in is less than a predetermined value.

特開２０１７－１７２９３４号公報Japanese Patent Application Publication No. 2017-172934

しかしながら、特許文献１に記載の水漏れ判定装置は、給水配管が温められる十分な給湯時間が確保されない場合は水漏れが無くても給水配管中の水温の変動量が小さくなり、次回の給湯までの間隔が短い場合には、水漏れが有っても給水配管中の水温の変動量が大きくなるため、水漏れ判定精度が低下するおそれがあった。しかも、特許文献１は、給湯器の上流側に予め加温した湯を貯留する貯湯器側で水漏れ判定を行う技術ではない。 However, in the water leak determination device described in Patent Document 1, if sufficient hot water supply time is not secured to warm up the water supply pipe, the amount of fluctuation in the water temperature in the water supply pipe will be small even if there is no water leak, and until the next hot water supply. If the interval is short, even if there is a water leak, the amount of variation in water temperature in the water supply piping will increase, so there is a risk that the water leak determination accuracy will decrease. Moreover, Patent Document 1 is not a technology for determining water leakage on the side of a water storage device that stores pre-heated hot water on the upstream side of the water heater.

そこで、貯湯器を有する給湯システムにおいて、貯湯器側で水漏れ判定精度を高めることが可能な水漏れ判定装置が望まれている。 Therefore, in a hot water supply system having a water storage device, there is a need for a water leakage determination device that can improve the accuracy of water leakage determination on the water storage device side.

本発明に係る給湯システムの水漏れ判定装置の特徴構成は、水が流通する給水配管と、前記給水配管から流入した水を加熱して湯として貯留する貯留槽と、前記貯留槽に貯留された湯を流出させる出湯配管と、前記出湯配管に前記給水配管の水を合流させる水量を調整する調整弁とを備えた貯湯器を有する給湯システムの水漏れ判定装置であって、前記貯湯器の外部で前記給水配管に接続された水道管を流通する水の温度を計測する水道水温計測部と、前記貯湯器の内部空気の温度を計測する雰囲気温度計測部と、前記調整弁よりも下流側で前記貯湯器の内部に位置する前記出湯配管を流通する湯の温度を計測する湯温計測部と、前記給湯システムの水漏れ判定を実行する判定部と、を備え、前記判定部は、前記貯湯器が出湯停止してから出湯開始するまでの待機状態で前記調整弁が前記給水配管の水を前記出湯配管に流通可能な弁位置にあるとき、前記水道水温計測部の計測値、前記湯温計測部の計測値及び前記雰囲気温度計測部の計測値に基づいて前記水漏れ判定を実行する点にある。 The characteristic configuration of the water leakage determination device for a hot water supply system according to the present invention includes a water supply pipe through which water flows, a storage tank that heats the water flowing from the water supply pipe and stores it as hot water, and a hot water stored in the storage tank. A water leakage determination device for a hot water supply system having a hot water storage system including a hot water outlet pipe for discharging hot water and a regulating valve for adjusting the amount of water for merging water from the water supply pipe into the hot water outlet pipe, the apparatus comprising: a tap water temperature measuring unit that measures the temperature of water flowing through a water pipe connected to the water supply pipe; an ambient temperature measuring unit that measures the temperature of the internal air of the water storage device; and a downstream side of the regulating valve. A hot water temperature measurement unit that measures the temperature of hot water flowing through the hot water outlet pipe located inside the water storage device, and a determination unit that executes a water leak determination of the hot water supply system. When the adjustment valve is in a valve position that allows water from the water supply pipe to flow to the hot water pipe in a standby state from when the appliance stops dispensing hot water to when it starts dispensing hot water, the measurement value of the tap water temperature measurement unit, the hot water temperature The water leak determination is performed based on the measured value of the measuring section and the measured value of the ambient temperature measuring section.

出湯停止後の待機状態において、給湯システムに水漏れが発生していない場合には、貯湯器における出湯配管の湯温は、貯湯器内部の雰囲気温度に収束する。一方、出湯停止後の待機状態において、給湯システムに水漏れが発生している場合には、出湯配管に給水配管からの冷水が調整弁を介して常時流通しているため、出湯停止後、出湯配管の湯温が貯湯器内部の雰囲気温度に追従せず、出湯配管の湯温が水道管の水道水の温度に収束する。 In a standby state after the hot water supply is stopped, if there is no water leakage in the hot water supply system, the temperature of the hot water in the hot water supply pipe in the hot water storage unit converges to the atmospheric temperature inside the water storage unit. On the other hand, if a water leak occurs in the hot water supply system in the standby state after the hot water tap has stopped, cold water from the hot water supply pipe is constantly flowing through the hot water supply pipe through the regulating valve, The hot water temperature in the pipes does not follow the atmospheric temperature inside the water storage device, and the hot water temperature in the hot water pipes converges to the temperature of the tap water in the water pipes.

そこで、本構成では、貯湯器が待機状態にあるとき、水道水温計測部の計測値、湯温計測部の計測値及び雰囲気温度計測部の計測値に基づいて水漏れ判定を実行する。つまり、給湯システムに水漏れの有無により温度変化の挙動が異なる出湯配管の湯温に基づいて水漏れ判定を実行すれば、水漏れ判定が正確なものとなる。 Therefore, in this configuration, when the water storage device is in a standby state, water leakage determination is performed based on the measured value of the tap water temperature measuring section, the measured value of the hot water temperature measuring section, and the measured value of the ambient temperature measuring section. In other words, if the water leakage determination is performed based on the hot water temperature of the hot water outlet piping, which changes in temperature depending on whether there is a water leakage in the hot water supply system, the water leakage determination will be accurate.

このように、出湯停止後の待機状態において水漏れ判定を実行するため、給湯システムの使用頻度に関係なく、貯湯器側で水漏れ判定精度を高めることが可能な給湯システムの水漏れ判定装置を提供できた。 In this way, water leak detection is performed in the standby state after the hot water supply has stopped, so we have developed a water leak detection device for hot water supply systems that can improve the accuracy of water leak detection on the water storage side, regardless of the frequency of use of the hot water system. I was able to provide it.

他の特徴構成は、前記判定部は、前記湯温計測部の計測値と前記雰囲気温度計測部の計測値との差の絶対値が所定温度以下となれば水漏れが無いと判定する点にある。 Another characteristic configuration is that the determination unit determines that there is no water leakage if the absolute value of the difference between the measurement value of the hot water temperature measurement unit and the measurement value of the ambient temperature measurement unit is equal to or lower than a predetermined temperature. be.

出湯停止後の待機状態において、給湯システムに水漏れが発生していない場合には、貯湯器における出湯配管の湯温は、貯湯器内部の雰囲気温度に収束する。このため、本構成のように、湯温計測部の計測値と雰囲気温度計測部の計測値との差の絶対値が所定温度以下となれば水漏れが無いと判定すれば、水漏れ判定が正確なものとなる。 In a standby state after the hot water supply is stopped, if there is no water leakage in the hot water supply system, the temperature of the hot water in the hot water supply pipe in the hot water storage unit converges to the atmospheric temperature inside the water storage unit. Therefore, as in this configuration, if the absolute value of the difference between the measured value of the hot water temperature measuring section and the measured value of the ambient temperature measuring section is below a predetermined temperature, it is determined that there is no water leakage. It will be accurate.

他の特徴構成は、前記判定部は、前記湯温計測部の計測値が、前記雰囲気温度計測部の計測値よりも前記水道水温計測部の計測値に近い値であるとき、水漏れが有ると判定する点にある。 Another characteristic configuration is that the determination unit determines that there is a water leak when the measurement value of the hot water temperature measurement unit is closer to the measurement value of the tap water temperature measurement unit than the measurement value of the ambient temperature measurement unit. The point is to judge that.

出湯停止後の待機状態において、給湯システムに水漏れが発生している場合には、出湯配管に給水配管からの冷水が常時流通しているため、出湯停止後、出湯配管の湯温が貯湯器内部の雰囲気温度に追従せず、出湯配管の湯温が水道水の温度に収束する。このため、本構成のように、湯温計測部の計測値が、雰囲気温度計測部の計測値よりも水道水温計測部の計測値に近い値であるとき、水漏れが有ると判定すれば、水漏れ判定が正確なものとなる。 If there is a water leak in the hot water supply system in the standby state after the hot water supply has stopped, cold water from the water supply pipe is constantly flowing through the hot water supply pipe, so after the hot water supply has stopped, the temperature of the hot water in the hot water supply pipe will be lower than that of the hot water storage device. The hot water temperature in the hot water piping converges to the tap water temperature without following the internal atmospheric temperature. Therefore, as in this configuration, when the measured value of the hot water temperature measuring section is closer to the measured value of the tap water temperature measuring section than the measured value of the ambient temperature measuring section, if it is determined that there is a water leak, Water leakage determination becomes accurate.

他の特徴構成は、前記出湯配管を流通する湯の流量を計測する流量計測部をさらに備え、前記判定部は、前記流量計測部の計測値が所定値未満であるときに前記待機状態にあるとして、前記水漏れ判定を実行する点にある。 Another characteristic configuration further includes a flow rate measuring section that measures the flow rate of hot water flowing through the hot water tap pipe, and the determining section is in the standby state when the measured value of the flow rate measuring section is less than a predetermined value. The point is that the water leakage determination described above is executed.

本構成では、水漏れ判定を実行する貯湯器の待機状態を確実に検出することができる。 With this configuration, it is possible to reliably detect the standby state of the water storage device in which water leakage determination is to be performed.

他の特徴構成は、前記判定部は、前記流量計測部の計測値が前記所定値以上から前記所定値未満となった出湯停止後、前記湯温計測部の計測値の変化率に基づいて前記水漏れ判定を実行する点にある。 Another characteristic configuration is that, after the hot water supply is stopped when the measured value of the flow rate measuring unit becomes less than the predetermined value from the predetermined value, the determining unit determines the rate of change in the measured value of the hot water temperature measuring unit. The point is to perform water leak detection.

通常、水道水の温度は、貯湯器内部の雰囲気温度及び出湯配管の湯温よりも低い。つまり、出湯停止後、貯湯器内部の雰囲気温度が出湯配管の湯温よりも高い場合、水漏れが無いときに出湯配管の湯温が上昇し、水漏れがあるときに出湯配管の湯温が低下することから、出湯配管の湯温の変化方向により水漏れの有無が分かる。一方、出湯停止後、貯湯器内部の雰囲気温度が出湯配管の湯温よりも低い場合、水漏れが無いときに出湯配管の湯温が緩勾配で低下し、水漏れがあるときに出湯配管の湯温が急勾配で低下することから、出湯配管の湯温の低下勾配により水漏れの有無が分かる。このため、本構成のように、出湯停止後、湯温計測部の計測値の変化率に基づいて水漏れ判定を実行すれば、水漏れ判定が正確なものとなる。 Normally, the temperature of tap water is lower than the ambient temperature inside the water storage device and the temperature of hot water in the hot water outlet pipe. In other words, if the atmospheric temperature inside the hot water storage device is higher than the hot water temperature in the hot water tap piping after the hot water tap has stopped, the hot water temperature in the hot water tap piping will rise when there is no water leakage, and the hot water temperature in the hot water tap piping will rise when there is a water leak. Since the water temperature decreases, the presence or absence of water leakage can be determined by the direction of change in the hot water temperature in the hot water piping. On the other hand, if the atmospheric temperature inside the hot water storage device is lower than the hot water temperature in the hot water tap piping after the hot water tap has stopped, the hot water temperature in the hot water tap pipe will drop at a gentle slope when there is no water leakage, and if there is a water leak, the hot water temperature in the hot water tap piping will drop. Since the hot water temperature decreases at a steep slope, the presence or absence of water leakage can be determined by the decreasing slope of the hot water temperature in the hot water piping. For this reason, if the water leakage determination is executed based on the rate of change of the measured value of the hot water temperature measurement unit after the hot water supply is stopped, as in this configuration, the water leakage determination will be accurate.

他の特徴構成は、前記判定部による前記水漏れ判定の結果を報知する報知部をさらに備え、前記報知部は、前記判定部により水漏れが有ると判定されたときに作動するように構成されている点にある。 Another characteristic configuration further includes a notification unit that notifies the result of the water leak determination by the determination unit, and the notification unit is configured to operate when the determination unit determines that there is a water leak. The point is that

本構成のように、水漏れが有る場合に報知部を作動させれば、ユーザに対しては水漏れ情報を周知することが可能となり、事業者に対しては水漏れ防止措置の迅速な対応が可能となる。 By activating the notification unit when there is a water leak, as in this configuration, users can be informed of water leak information, and businesses can quickly take measures to prevent water leaks. becomes possible.

給湯システムの概略図である。It is a schematic diagram of a hot water supply system. 水漏れ判定装置のブロック図である。FIG. 2 is a block diagram of a water leak determination device. 第一実施形態に係る水漏れ判定フロー図である。It is a water leak determination flowchart based on 1st embodiment. 第二実施形態に係る水漏れ判定フロー図である。It is a water leak determination flowchart based on 2nd embodiment. 雰囲気温度が出湯目標温度よりも高い場合の湯温挙動例を示す図である。It is a figure which shows the example of hot water temperature behavior when ambient temperature is higher than hot water tapping target temperature. 雰囲気温度が出湯目標温度よりも低い場合の湯温挙動例を示す図である。It is a figure which shows the example of hot water temperature behavior when ambient temperature is lower than hot water tapping target temperature.

以下に、本発明に係る給湯システムの水漏れ判定装置の実施形態について、図面に基づいて説明する。本実施形態では、水漏れ判定装置の一例として、貯湯器１及び給湯器１０を有する給湯システムＸの水漏れを判定する水漏れ判定装置１００として説明する。ただし、以下の実施形態に限定されることなく、その要旨を逸脱しない範囲内で種々の変形が可能である。 DESCRIPTION OF THE PREFERRED EMBODIMENTS Below, embodiments of a water leak determination device for a hot water supply system according to the present invention will be described based on the drawings. In this embodiment, as an example of a water leak determination device, a water leak determination device 100 that determines a water leak in a hot water system X having a water storage device 1 and a water heater 10 will be described. However, the present invention is not limited to the following embodiments, and various modifications can be made without departing from the gist thereof.

図１に示すように、給湯システムＸは、貯湯器１で貯留された湯を給湯器１０で加熱し、給湯器１０の外部にある温水消費装置９０に供給する。本実施形態における水漏れ判定装置１００は、貯湯器１を有する給湯システムＸの水漏れを判定する。この水漏れ判定装置１００は、主として給湯システムＸにおける貯湯器１よりも下流側（後述する調整弁６の下流側）の配管系やバルブの破損による水漏れや、バルブの異物噛み込みによる下流側への水漏れ等の有無を判定する。この水漏れ判定装置１００は、給湯システムＸの給湯機能の一部として機能する機構であっても良いし、給湯システムＸの状態を遠隔地で集中管理する管理センタに設けられたコンピュータに機能の一部を受け持たせても良い。 As shown in FIG. 1, the hot water system X heats hot water stored in a water heater 1 with a water heater 10 and supplies it to a hot water consumption device 90 located outside the water heater 10. The water leakage determination device 100 in this embodiment determines water leakage in the hot water supply system X having the hot water storage device 1 . This water leakage determination device 100 mainly detects water leakage due to damage to the piping system or valves downstream of the water storage device 1 (downstream side of the regulating valve 6, which will be described later) in the hot water supply system Determine whether there is any water leakage, etc. This water leak determination device 100 may be a mechanism that functions as part of the hot water supply function of the hot water supply system X, or may be a mechanism that functions as a part of the hot water supply function of the hot water supply system You may be allowed to take part of the responsibility.

給湯システムＸは、温水消費装置９０に給湯する給湯器１０と、給湯器１０よりも上流側で湯を貯留する貯湯器１と、給湯器１０及び貯湯器１の作動を制御する制御部２とを備えている。制御部２は、各種処理を実行するＣＰＵやメモリを中核としたソフトウェア、又はハードウェアとソフトウェアとの協働により構成されている。 The hot water supply system It is equipped with The control unit 2 is configured by software with a CPU and memory as its core that execute various processes, or by cooperation between hardware and software.

給湯器１０は、ケーシング６０内部に配管２０を備えており、配管２０に給湯熱源である熱交換器３０が設けられている。この給湯器１０は、ガス配管３１から供給される天然ガスなどの燃焼ガスの燃焼火炎で得た熱を、熱交換器３０により配管２０を流通する貯湯器１からの湯に与えて給湯機能を実行するガス給湯器である。 The water heater 10 includes a pipe 20 inside a casing 60, and the pipe 20 is provided with a heat exchanger 30 that is a hot water supply heat source. This water heater 10 provides a hot water supply function by applying heat obtained from a combustion flame of combustion gas such as natural gas supplied from a gas pipe 31 to hot water from a water storage device 1 flowing through a pipe 20 using a heat exchanger 30. It is a gas water heater that runs.

本実施形態における給湯器１０は、ケーシング６０と、ケーシング６０内に設けられた配管２０と、配管２０の途中に設けられた熱交換器３０と、貯湯器１から供給された湯の流量（給湯流量）を計測する流量計測部４０とを備えている。 The water heater 10 in this embodiment includes a casing 60, a pipe 20 provided in the casing 60, a heat exchanger 30 provided in the middle of the pipe 20, and a flow rate of hot water supplied from the water storage device 1 (hot water supply The flow rate measurement unit 40 is provided to measure the flow rate (flow rate).

流量計測部４０は、熱交換器３０を介して配管２０を流通する給湯流量を計測する流量計を有している。流量計測部４０は、例えば、流量計としてプロペラ式流量計で構成されており、当該流量計で検出した流量に係る情報を制御部２や水漏れ判定装置１００へ出力する。本実施形態における流量計測部４０は、その計測のダイナミックレンジの下限は２リットル毎分（所定値の一例）に設定されており、配管２０を流通する給湯流量が２リットル毎分未満の場合、ゼロを出力する。 The flow rate measurement unit 40 has a flow meter that measures the flow rate of hot water flowing through the piping 20 via the heat exchanger 30. The flow rate measurement unit 40 is configured with a propeller-type flowmeter as a flowmeter, for example, and outputs information related to the flow rate detected by the flowmeter to the control unit 2 and the water leak determination device 100. The lower limit of the dynamic range of the flow measurement unit 40 in this embodiment is set to 2 liters per minute (an example of a predetermined value), and when the flow rate of hot water flowing through the pipe 20 is less than 2 liters per minute, Outputs zero.

貯湯器１は、熱源３から排出された熱を湯水（湯）として蓄え（即ち、熱媒体としての湯水で熱を蓄え）、当該湯水を出湯配管５２を介して給湯器１０へと流出させるように構成されている。貯湯器１は、湯水（湯）を貯留する貯湯タンク４（貯留槽の一例）を有する。貯湯タンク４の下部には、水道水が供給される給水配管５１が接続されており、貯湯タンク４の内部には湯水が満たされている。熱源３は、燃料電池、ガスエンジンコージェネレーション装置、電気式ヒートポンプ装置、太陽熱集熱装置など、熱を排出する様々な装置を用いて実現できる。 The water storage device 1 stores the heat discharged from the heat source 3 as hot water (hot water) (that is, stores heat with hot water as a heat medium), and causes the hot water to flow out to the water heater 10 via the hot water piping 52. It is composed of The hot water storage device 1 has a hot water storage tank 4 (an example of a storage tank) that stores hot water (hot water). A water supply pipe 51 through which tap water is supplied is connected to the lower part of the hot water storage tank 4, and the inside of the hot water storage tank 4 is filled with hot water. The heat source 3 can be realized using various devices that discharge heat, such as a fuel cell, a gas engine cogeneration device, an electric heat pump device, and a solar heat collector.

本実施形態における貯湯器１は、ケーシング１１と、ケーシング１１内に設けられ、水道管Ｗからの水（水道水）が流通する給水配管５１及び湯が流通する出湯配管５２を含む配管５と、給水配管５１と出湯配管５２との間に設けられた貯湯タンク４と、貯湯タンク４の湯水を加熱する熱源３と、出湯配管５２に給水配管５１の水を合流させる水量を調整する調整弁６と、を備えている。 The water storage device 1 in this embodiment includes a casing 11, and piping 5 provided in the casing 11, including a water supply pipe 51 through which water (tap water) from a water pipe W flows and a hot water outlet pipe 52 through which hot water flows. A hot water storage tank 4 provided between the water supply pipe 51 and the hot water outlet pipe 52, a heat source 3 that heats the hot water in the hot water storage tank 4, and an adjustment valve 6 that adjusts the amount of water that joins the water in the water supply pipe 51 to the hot water outlet pipe 52. It is equipped with.

ケーシング１１は、内部が空気で満たされており、空気の温度を計測する温度センサ等の温度計を有する雰囲気温度計測部８が設けられている。雰囲気温度計測部８は、例えば、温度センサとして熱電対やサーミスタ（以下、「熱電対等」を言う）を含んでおり、当該熱電対等で検出した温度に係る情報を、制御部２や水漏れ判定装置１００へ出力する。 The inside of the casing 11 is filled with air, and an atmospheric temperature measuring section 8 having a thermometer such as a temperature sensor for measuring the temperature of the air is provided. The ambient temperature measurement unit 8 includes, for example, a thermocouple or a thermistor (hereinafter referred to as a “thermocouple, etc.”) as a temperature sensor, and uses information related to the temperature detected by the thermocouple or the like to be used by the control unit 2 or water leakage determination. Output to the device 100.

配管５は、ケーシング１１内部に収容されており、給水して出湯する配管部である。配管５のうち、貯湯タンク４より上流側の配管５が、給水配管５１であり、貯湯タンク４より下流側の配管５が、出湯配管５２である。したがって、配管５は、ケーシング１１外部の水道管Ｗから供給された水道水を給水源として貯湯タンク４で湯水として貯留し、貯湯タンク４から出湯配管５２へと流通させて、給湯器１０へ出湯する。この出湯配管５２を流通する湯の流量は、上述した流量計測部４０にて計測される。 The piping 5 is housed inside the casing 11 and is a piping section that supplies water and discharges hot water. Of the piping 5, the piping 5 upstream from the hot water storage tank 4 is a water supply piping 51, and the piping 5 downstream from the hot water storage tank 4 is a hot water outlet piping 52. Therefore, the piping 5 uses tap water supplied from the water pipe W outside the casing 11 as a water supply source, stores it as hot water in the hot water storage tank 4, distributes it from the hot water storage tank 4 to the hot water outlet piping 52, and supplies the hot water to the water heater 10. do. The flow rate of the hot water flowing through the hot water tapping pipe 52 is measured by the flow rate measuring section 40 described above.

給水配管５１は、貯湯器１の外部の水道管Ｗから給水を受け、貯湯タンク４に連通する配管部であり、貯湯タンク４と並列して出湯配管５２に水を合流させる合流路５１ａを有している。水道管Ｗには、水道水温計測部７が設けられている。給水配管５１には、給水バルブ５３と水温計測部５４とが設けられている。本実施形態における給水配管５１には、給水バルブ５３及び水温計測部５４が上流から下流に向かってこの順に設けられており、出湯配管５２に給水配管５１の水を合流させる合流路５１ａにおける調整弁６よりも上流側に設けられている。出湯配管５２は、貯湯タンク４と連通し、貯湯タンク４から排出される湯を給湯器１０へ供給する配管部である。出湯配管５２には、湯温計測部９が設けられている。 The water supply pipe 51 is a pipe section that receives water supply from a water pipe W outside the water storage device 1 and communicates with the hot water storage tank 4, and has a confluence channel 51a that is parallel to the hot water storage tank 4 and makes water join the hot water outlet pipe 52. are doing. The water pipe W is provided with a tap water temperature measuring section 7. The water supply pipe 51 is provided with a water supply valve 53 and a water temperature measuring section 54 . In the water supply pipe 51 in this embodiment, a water supply valve 53 and a water temperature measurement unit 54 are provided in this order from upstream to downstream, and a regulating valve in a confluence passage 51a that joins water from the water supply pipe 51 to the hot water supply pipe 52. It is provided upstream of 6. The hot water outlet piping 52 is a piping section that communicates with the hot water storage tank 4 and supplies hot water discharged from the hot water storage tank 4 to the water heater 10. A hot water temperature measuring section 9 is provided in the hot water tap pipe 52 .

給水バルブ５３は、給水配管５１の水の流通を制御するボール弁等で構成される弁部材である。なお、給水バルブ５３に用いる弁部材としては、その他、ダイヤフラム弁、バタフライ弁などを用いることもできる。この給水バルブ５３は、制御部２からの指示に従って、開状態と閉状態とに切り替わる。つまり、給水バルブ５３が開状態で貯湯タンク４への給水可能となる。給水バルブ５３の開閉状態に係る情報は、制御部２や水漏れ判定装置１００へ出力される。 The water supply valve 53 is a valve member configured with a ball valve or the like that controls the flow of water in the water supply pipe 51. In addition, as the valve member used for the water supply valve 53, a diaphragm valve, a butterfly valve, etc. can also be used. The water supply valve 53 is switched between an open state and a closed state according to instructions from the control unit 2. In other words, water can be supplied to the hot water tank 4 with the water supply valve 53 open. Information regarding the open/close state of the water supply valve 53 is output to the control unit 2 and the water leak determination device 100.

水道水温計測部７は、水道管Ｗを流通する水道水の温度を計測する温度センサ等の温度計を有している。また、水温計測部５４は、給水配管５１を流通する水の温度を計測する温度センサ等の温度計を有している。水道水温計測部７は、ケーシング１１（貯湯器１）の外部に設けられており、水温計測部５４は、ケーシング１１（貯湯器１）の内部に設けられている。水道水温計測部７及び水温計測部５４は、例えば、温度センサとして熱電対等を含んでおり、当該熱電対等で検出した温度に係る情報を、制御部２や水漏れ判定装置１００へ出力する。 The tap water temperature measurement unit 7 has a thermometer such as a temperature sensor that measures the temperature of tap water flowing through the water pipe W. Further, the water temperature measurement unit 54 includes a thermometer such as a temperature sensor that measures the temperature of water flowing through the water supply pipe 51. The tap water temperature measurement section 7 is provided outside the casing 11 (water storage device 1), and the water temperature measurement section 54 is provided inside the casing 11 (water storage device 1). The tap water temperature measurement unit 7 and the water temperature measurement unit 54 include, for example, a thermocouple or the like as a temperature sensor, and output information regarding the temperature detected by the thermocouple or the like to the control unit 2 or the water leak determination device 100.

湯温計測部９は、出湯配管５２を流通する湯の温度を計測する温度センサ等の温度計を有している。つまり、湯温計測部９は、出湯配管５２を流通する湯の温度として給湯器１０への出湯温度を検出する。湯温計測部９は、例えば、温度センサとして熱電対等を含んでおり、当該熱電対等で検出した温度に係る情報を、制御部２や水漏れ判定装置１００へ出力する。本実施形態における湯温計測部９は、貯湯タンク４の下流側であって、出湯配管５２と給水配管５１との接続部に設けられた調整弁６の下流側でケーシング１１（貯湯器１）の内部に設けられている。 The hot water temperature measuring section 9 has a thermometer such as a temperature sensor that measures the temperature of hot water flowing through the hot water tap pipe 52 . In other words, the hot water temperature measurement unit 9 detects the temperature of hot water supplied to the water heater 10 as the temperature of hot water flowing through the hot water supply pipe 52 . The hot water temperature measurement unit 9 includes, for example, a thermocouple as a temperature sensor, and outputs information related to the temperature detected by the thermocouple or the like to the control unit 2 and the water leak determination device 100. The hot water temperature measurement unit 9 in this embodiment is located downstream of the hot water storage tank 4 and connected to the casing 11 (hot water storage device 1) of the regulating valve 6 provided at the connection between the hot water outlet pipe 52 and the water supply pipe 51. is located inside.

貯湯タンク４には、貯湯タンク４と熱源３との間で湯水を循環させる湯水循環路１３が接続されている。この湯水循環路１３の途中には循環ポンプ１２が設けられている。湯水循環路１３は、貯湯タンク４の下部から取り出された湯水が、熱源３を経由して、貯湯タンク４の上部へと帰還するように設けられている。つまり、貯湯タンク４の下部から取り出された相対的に低温の湯水が、熱源３で熱を回収し、熱源３から排出された熱を回収した相対的に高温の湯水は、貯湯タンク４の上部に帰還する。その結果、貯湯タンク４では、上部には相対的に高温の湯水が貯えられ、下部には相対的に低温の湯水が貯えられるというように、温度成層を形成して湯水が貯えられることになる。 A hot water circulation path 13 that circulates hot water between the hot water storage tank 4 and the heat source 3 is connected to the hot water storage tank 4 . A circulation pump 12 is provided in the middle of this hot water circulation path 13. The hot water circulation path 13 is provided so that hot water taken out from the lower part of the hot water storage tank 4 returns to the upper part of the hot water storage tank 4 via the heat source 3. In other words, the relatively low temperature hot water taken out from the lower part of the hot water storage tank 4 recovers heat at the heat source 3, and the relatively high temperature hot water that has recovered the heat discharged from the heat source 3 is transferred to the upper part of the hot water storage tank 4. to return to. As a result, in the hot water storage tank 4, hot water is stored with a temperature stratification such that hot water with a relatively high temperature is stored in the upper part and hot water with a relatively low temperature is stored in the lower part. .

貯湯タンク４の上部には、貯えている湯水を出湯する出湯配管５２が接続されている。この出湯配管５２からは、貯湯タンク４に貯留されている相対的に高温の湯水（湯）が放出される。調整弁６では、出湯配管５２を介して貯湯タンク４から放出される相対的に高温の湯と、給水配管５１を介して供給される相対的に低温の水とが流れ込む。制御部２は、調整弁６から下流側の出湯配管５２へと流通する湯の温度が、出湯目標温度（例えば、３０～３５℃）となるように調整弁６の動作を制御する。 A hot water outlet pipe 52 for discharging the stored hot water is connected to the upper part of the hot water storage tank 4. Relatively high temperature hot water (hot water) stored in the hot water storage tank 4 is discharged from the hot water outlet pipe 52. In the regulating valve 6, relatively high temperature hot water discharged from the hot water storage tank 4 via the hot water tap pipe 52 and relatively low temperature water supplied via the water supply pipe 51 flow into the regulating valve 6. The control unit 2 controls the operation of the regulating valve 6 so that the temperature of the hot water flowing from the regulating valve 6 to the hot water tapping pipe 52 on the downstream side reaches the hot water tapping target temperature (for example, 30 to 35° C.).

調整弁６は、出湯配管５２の湯の流通量、及び、給水配管５１からの水の合流量を制御する三方弁等で構成される弁部材である。なお、調整弁６に用いる弁部材としては、ロータリバルブ、電磁弁などを用いることができる。この調整弁６は、制御部２からの指示に従って、出湯配管５２及び給水配管５１の開度を調整する。つまり、制御部２は、調整弁６を出湯配管５２が開状態となるように制御して給湯器１０への出湯可能となり、出湯目標温度に基づいて給水配管５１の連通開度を制御する。一方、給湯器１０への出湯を停止する際、制御部２は、貯湯タンク４側の出湯配管５２を遮断すると共に、給水配管５１側を全開状態となるように調整弁６の弁位置を制御しておく。つまり、給湯器１０への出湯を停止する際、調整弁６は、給水配管５１の水を出湯配管５２に流通可能な弁位置となっている。調整弁６の弁位置に係る情報は、制御部２や水漏れ判定装置１００へ出力される。 The regulating valve 6 is a valve member composed of a three-way valve or the like that controls the flow rate of hot water in the hot water tap pipe 52 and the flow rate of water from the water supply pipe 51. In addition, as a valve member used for the regulating valve 6, a rotary valve, a solenoid valve, etc. can be used. The adjustment valve 6 adjusts the opening degrees of the hot water tap pipe 52 and the water supply pipe 51 according to instructions from the control unit 2 . That is, the control unit 2 controls the regulating valve 6 to open the hot water piping 52 so that hot water can be discharged to the water heater 10, and controls the degree of communication opening of the water supply piping 51 based on the target hot water temperature. On the other hand, when stopping the hot water supply to the water heater 10, the control unit 2 controls the valve position of the regulating valve 6 so that the hot water supply pipe 52 on the hot water storage tank 4 side is shut off and the water supply pipe 51 side is fully open. I'll keep it. That is, when stopping the hot water supply to the water heater 10, the regulating valve 6 is at a valve position that allows water from the water supply pipe 51 to flow to the hot water supply pipe 52. Information regarding the valve position of the regulating valve 6 is output to the control unit 2 and the water leak determination device 100.

図２に示すように、水漏れ判定装置１００は、上述した水道水温計測部７と雰囲気温度計測部８と湯温計測部９と流量計測部４０とを備えている。また、水漏れ判定装置１００は、通信部３２と判定実行部３３（判定部の一例）と漏水判定部３４（判定部の一例）と計時部３５と報知部３６と記憶部３７と学習部３８とを備えている。判定実行部３３、漏水判定部３４及び学習部３８は、各種処理を実行するＣＰＵやメモリを中核としたソフトウェア、又はハードウェアとソフトウェアとの協働により構成されている。記憶部３７は、ＲＡＭやＨＤＤといったハードウェアで構成されている。 As shown in FIG. 2, the water leak determination device 100 includes the above-mentioned tap water temperature measurement section 7, ambient temperature measurement section 8, hot water temperature measurement section 9, and flow rate measurement section 40. The water leak determination device 100 also includes a communication unit 32, a determination execution unit 33 (an example of a determination unit), a water leak determination unit 34 (an example of a determination unit), a timer 35, a notification unit 36, a storage unit 37, and a learning unit 38. It is equipped with The determination execution unit 33, the water leakage determination unit 34, and the learning unit 38 are configured by software centered on a CPU and memory that execute various processes, or by collaboration between hardware and software. The storage unit 37 is composed of hardware such as a RAM and an HDD.

通信部３２は、貯湯器１との間で有線又は無線で構成されるネットワークを介して送受信するためのインターフェースである。本実施形態における通信部３２は、水道水温計測部７、雰囲気温度計測部８、湯温計測部９及び流量計測部４０の計測値を受信すると共に、制御部２に指示信号を送信する。 The communication unit 32 is an interface for transmitting and receiving data to and from the water storage device 1 via a wired or wireless network. The communication unit 32 in this embodiment receives the measured values of the tap water temperature measurement unit 7, the ambient temperature measurement unit 8, the hot water temperature measurement unit 9, and the flow rate measurement unit 40, and transmits an instruction signal to the control unit 2.

判定実行部３３は、給湯システムＸにおける水漏れ判定の実行を制御する。判定実行部３３より水漏れ判定を開始するとの指示信号を受けて、漏水判定部３４が水漏れの有無を判定する。判定実行部３３は、流量計測部４０の計測値が所定値（例えば２リットル毎分）未満の待機状態、又は、流量計測部４０の計測値が所定値（例えば２リットル毎分）以上から所定値未満となった出湯停止後（待機状態の一形態）、水漏れ判定を実行する。また、判定実行部３３は、水漏れ判定中に流量計測部４０の計測値が所定値（例えば２リットル毎分）以上となったとき、水漏れ判定の実行を停止させる。なお、給湯システムＸに水漏れが有った場合でも通常は少量であるため、流量計測部４０の計測値が所定値（例えば２リットル毎分）以上とならず、水漏れ判定の実行が停止されない。 The determination execution unit 33 controls execution of water leak determination in the hot water supply system X. Upon receiving an instruction signal from the determination execution unit 33 to start the water leak determination, the water leak determination unit 34 determines whether there is a water leak. The determination execution unit 33 is in a standby state where the measured value of the flow rate measuring unit 40 is less than a predetermined value (for example, 2 liters per minute), or when the measured value of the flow rate measuring unit 40 is equal to or higher than a predetermined value (for example, 2 liters per minute). After the hot water supply stops when the value becomes lower than the value (one form of standby state), a water leakage determination is performed. Furthermore, when the measured value of the flow rate measuring section 40 becomes equal to or higher than a predetermined value (for example, 2 liters per minute) during the water leak determination, the determination execution unit 33 stops the execution of the water leak determination. Note that even if there is a water leak in the hot water supply system Not done.

判定実行部３３は、学習部３８が学習した出湯期間に基づいて水漏れ判定を実行することが好ましい。例えば、学習部３８が学習した出湯期間のうち、出湯しない確率の高い時間帯に定期的（例えば週１回）に水漏れ判定を実行する。また、判定実行部３３は、記憶部３７が記憶した水漏れ判定の結果に基づいて、水漏れ判定の実行頻度を変更することが好ましい。例えば、水漏れ判定により水漏れが無い回数が連続して所定回数以上となったとき、水漏れ判定の実行頻度を週１回から２週間に１回に変更する。 It is preferable that the determination execution unit 33 executes the water leak determination based on the hot water supply period learned by the learning unit 38. For example, during the hot water supply period learned by the learning unit 38, the water leak determination is performed periodically (for example, once a week) during a time period when there is a high probability that the hot water will not be discharged. Further, it is preferable that the determination execution unit 33 changes the frequency of execution of the water leak determination based on the result of the water leak determination stored in the storage unit 37. For example, when the number of consecutive times of no water leakage as determined by the water leakage determination is equal to or greater than a predetermined number of times, the frequency of execution of the water leakage determination is changed from once a week to once every two weeks.

漏水判定部３４は、給湯システムＸにおける水漏れの有無を判定する。漏水判定部３４は、流量計測部４０の計測値が所定値（例えば２リットル毎分）未満の待機状態にあるとき、水道水温計測部７の計測値、湯温計測部９の計測値及び雰囲気温度計測部８の計測値に基づいて、水漏れ判定を実行する。一例として、漏水判定部３４は、湯温計測部９の計測値と雰囲気温度計測部８の計測値との差の絶対値が所定温度（例えば５℃）以下となれば、水漏れが無いと判定する（第一実施形態）。また、湯温計測部９の計測値が、雰囲気温度計測部８の計測値よりも水道水温計測部７の計測値に近い値であるとき、水漏れが有ると判定する（第一実施形態）。この判定は、一定時間（例えば１分）継続して実行することが好ましい。 The water leak determination unit 34 determines whether there is a water leak in the hot water supply system X. When the water leak determination unit 34 is in a standby state in which the measured value of the flow rate measuring unit 40 is less than a predetermined value (for example, 2 liters per minute), the water leakage determination unit 34 detects the measured value of the tap water temperature measuring unit 7, the measured value of the hot water temperature measuring unit 9, and the atmosphere. Water leakage determination is performed based on the measured value of the temperature measurement unit 8. For example, the water leakage determination unit 34 determines that there is no water leakage if the absolute value of the difference between the measurement value of the hot water temperature measurement unit 9 and the measurement value of the ambient temperature measurement unit 8 is a predetermined temperature (for example, 5° C.) or less. Determine (first embodiment). Further, when the measured value of the hot water temperature measuring section 9 is closer to the measured value of the tap water temperature measuring section 7 than the measured value of the ambient temperature measuring section 8, it is determined that there is a water leak (first embodiment) . This determination is preferably performed continuously for a certain period of time (for example, one minute).

流量計測部４０の計測値が所定値（例えば２リットル毎分）以上から所定値未満となった給湯停止後、漏水判定部３４は、湯温計測部９の計測値の変化率に基づいて、水漏れ判定を実行してもよい（第二実施形態）。一例として、出湯停止後、雰囲気温度計測部８の計測値が出湯目標温度（湯温計測部９の計測値）よりも高い場合、水漏れが無いときに出湯配管１４の湯温が上昇し、水漏れが有るときに出湯配管１４の湯温が低下することから、漏水判定部３４は、出湯配管の湯温の変化方向により水漏れの有無を判定する。一方、出湯停止後、雰囲気温度計測部８の計測値が出湯目標温度（湯温計測部９の計測値）よりも低い場合、水漏れが無いときに出湯配管１４の湯温が緩勾配で低下し、水漏れがあるときに出湯配管１４の湯温が急勾配で低下することから、漏水判定部３４は、湯温計測部９の計測値の低下勾配により水漏れの有無を判定する。この判定は、一定時間（例えば１分）継続して実行することが好ましい。 After the hot water supply is stopped when the measured value of the flow rate measurement unit 40 falls from a predetermined value (for example, 2 liters per minute) or more to less than the predetermined value, the water leakage determination unit 34 determines, based on the rate of change of the measured value of the hot water temperature measurement unit 9, Water leakage determination may also be performed (second embodiment). As an example, if the measured value of the atmospheric temperature measuring section 8 is higher than the target hot water outlet temperature (the measured value of the hot water temperature measuring section 9) after hot water has stopped dispensing, the hot water temperature of the hot water dispensing pipe 14 increases when there is no water leakage. Since the temperature of the hot water in the hot water tap pipe 14 decreases when there is a water leak, the water leak determination unit 34 determines whether there is a water leak based on the direction of change in the hot water temperature in the hot water tap pipe. On the other hand, if the measured value of the ambient temperature measurement unit 8 is lower than the target hot water tap temperature (measured value of the hot water temperature measurement unit 9) after hot water tap stops, the hot water temperature in the hot water tap pipe 14 decreases at a gentle slope when there is no water leakage. However, when there is a water leak, the temperature of the hot water in the hot water outlet pipe 14 decreases at a steep gradient, so the water leak determining section 34 determines whether there is a water leak based on the decreasing gradient of the measured value of the hot water temperature measuring section 9. This determination is preferably performed continuously for a certain period of time (for example, one minute).

計時部３５は、時間の経過を計測する計時機構であり、判定実行部３３の水漏れ判定の指示信号を受けて計時を開始し、漏水判定部３４の要求に応じて経過時間に係る情報を出力する。 The clock unit 35 is a clock mechanism that measures the passage of time, and starts clocking upon receiving the water leak determination instruction signal from the determination execution unit 33, and transmits information regarding the elapsed time in response to a request from the water leak determination unit 34. Output.

報知部３６は、漏水判定部３４により水漏れ判定の結果を報知する。この報知部３６は、漏水判定部３４により水漏れが有ると判定された場合に、使用者や管理センタなどへ水漏れが発生している旨を報知する信号を発する機構である。報知部３６は、例えば水漏れを知らせる警報を音や光、もしくはその他の使用者が知覚可能な信号を発して水漏れが発生している旨を報知する。また、報知部３６は、給湯器１０の状態を遠隔地で集中管理する管理センタなどへ、電気通信回線を介して通信して、水漏れが発生している旨を報知することもできる。 The notification unit 36 notifies the water leakage determination result by the water leakage determination unit 34 . The notification unit 36 is a mechanism that, when the water leak determination unit 34 determines that there is a water leak, issues a signal to notify the user, the management center, etc. that a water leak has occurred. The notification unit 36 notifies the user that a water leak has occurred by emitting an alarm, such as sound, light, or other signals that can be perceived by the user. The notification unit 36 can also notify a management center that centrally manages the status of the water heater 10 via a telecommunications line to the effect that a water leak has occurred.

（第一実施形態の判定フロー）
図３及び図５～図６を用いて、第一実施形態における水漏れ判定装置１００の判定方法について説明する。 (Determination flow of first embodiment)
The determination method of the water leak determination device 100 in the first embodiment will be described using FIG. 3 and FIGS. 5 and 6.

図３に示すように、判定実行部３３が水漏れ判定を開始するか否か（待機状態か否か）を判定する（＃３１）。判定実行部３３は、流量計測部４０の計測値が所定値（例えば２リットル毎分）未満の待機状態にあるとき、水漏れ判定を実行する（＃３１Ｙｅｓ）。なお、学習部１６が学習した出湯期間のうち、出湯しない確率の比較的高い時間帯に水漏れ判定を開始することが好ましい。 As shown in FIG. 3, the determination execution unit 33 determines whether to start water leak determination (whether or not it is in a standby state) (#31). The determination execution unit 33 executes water leak determination when the measured value of the flow rate measurement unit 40 is in a standby state less than a predetermined value (for example, 2 liters per minute) (#31Yes). Note that it is preferable to start water leakage determination during a time period during which the hot water supply period learned by the learning unit 16 has a relatively high probability that hot water will not be discharged.

漏水判定部３４は、流量計測部４０の計測値が所定値（例えば２リットル毎分）以上となる出湯開始が行われたか否かを監視する（＃３２）。流量計測部４０の計測値が所定値以上となれば、判定を停止する（＃３２Ｙｅｓ、＃３３）。水漏れ判定を開始してから、計時部３５が計時を開始し、漏水判定部３４は、所定時間を経過したか否かを判定する（＃３４）。 The water leak determination unit 34 monitors whether hot water has started to be dispensed so that the measured value of the flow rate measurement unit 40 is equal to or higher than a predetermined value (for example, 2 liters per minute) (#32). If the measured value of the flow rate measurement unit 40 is equal to or greater than a predetermined value, the determination is stopped (#32Yes, #33). After starting the water leak determination, the timer 35 starts measuring time, and the water leak determiner 34 determines whether a predetermined time has elapsed (#34).

＃３４の判定の結果、所定時間を経過するまでに流量計測部４０の計測値が所定値以上となれば、判定を停止する（＃３４Ｎｏ、＃３２Ｙｅｓ、＃３３）。一方、＃３４の判定の結果、所定時間を経過すれば、漏水判定部３４が水漏れ判定を実行する（＃３４Ｙｅｓ、＃３５）。この所定時間は、数分程度確保することが好ましい。 As a result of the determination in #34, if the measured value of the flow rate measurement unit 40 becomes equal to or greater than the predetermined value before the predetermined time elapses, the determination is stopped (#34 No, #32 Yes, #33). On the other hand, as a result of the determination in #34, if the predetermined time has elapsed, the water leak determination unit 34 executes water leak determination (#34Yes, #35). This predetermined time is preferably about several minutes.

図５には、夏季のように雰囲気温度計測部８の計測値が出湯目標温度よりも高い場合の湯温計測部９で計測された湯温挙動例が示されており、図６には、冬季のように雰囲気温度計測部８の計測値が出湯目標温度よりも低い場合の湯温計測部９で計測された湯温挙動例が示されている。破線は、雰囲気温度計測部８で計測されたケーシング６０内部の雰囲気温度であり、一点鎖線は、出湯目標温度であり、二点鎖線は、水道水温計測部７で計測された水道管Ｗ内の水道水の温度である。また、図５（ａ）及び図６（ａ）の実線は、水漏れが無い場合の湯温計測部９で計測された出湯配管５２内の湯の温度であり、図５（ｂ）及び図６（ｂ）の実線は、水漏れが有る場合の湯温計測部９で計測された出湯配管５２内の湯の温度である。 FIG. 5 shows an example of hot water temperature behavior measured by the hot water temperature measuring section 9 when the measured value of the ambient temperature measuring section 8 is higher than the hot water outlet target temperature, such as in summer, and FIG. An example of the behavior of the hot water temperature measured by the hot water temperature measuring section 9 is shown when the measured value of the ambient temperature measuring section 8 is lower than the hot water outlet target temperature, such as in winter. The dashed line is the atmospheric temperature inside the casing 60 measured by the atmospheric temperature measuring section 8, the one-dot chain line is the hot water outlet target temperature, and the two-dot chain line is the temperature inside the water pipe W measured by the tap water temperature measuring section 7. This is the temperature of tap water. Moreover, the solid line in FIGS. 5(a) and 6(a) is the temperature of hot water in the hot water outlet pipe 52 measured by the hot water temperature measurement unit 9 when there is no water leakage, and the solid line in FIGS. The solid line in 6(b) is the temperature of hot water in the hot water outlet pipe 52 measured by the hot water temperature measurement unit 9 when there is water leakage.

出湯中は、図５及び図６の実線で示すように、湯温計測部９で計測された出湯配管５２内の湯の温度は、出湯目標温度となるように調整弁６の開度が調整されている。一方、出湯を停止したとき、湯温計測部９で計測された出湯配管５２内の湯の温度は、図５（ａ）及び図６（ａ）の実線で示すように、水漏れが無い場合には雰囲気温度に近づくように変化し、図５（ｂ）及び図６（ｂ）の実線で示すように、水漏れが有る場合には、給水配管５１に温度の低い水道水が流れ続けるため、急激に低下して水道水温計測部７で計測された水道水の温度に近い温度へと収束する。 During hot water dispensing, as shown by the solid line in FIGS. 5 and 6, the opening degree of the regulating valve 6 is adjusted so that the temperature of the hot water in the hot water supply pipe 52 measured by the hot water temperature measurement unit 9 reaches the target hot water dispensing temperature. has been done. On the other hand, when the hot water supply is stopped, the temperature of the hot water in the hot water supply pipe 52 measured by the hot water temperature measurement unit 9 is as shown by the solid line in FIGS. 5(a) and 6(a), when there is no water leakage. As shown by the solid lines in FIGS. 5(b) and 6(b), if there is a water leak, low-temperature tap water continues to flow into the water supply pipe 51. , rapidly decreases and converges to a temperature close to the temperature of the tap water measured by the tap water temperature measurement unit 7.

そこで、本実施形態における漏水判定部３４は、給湯を停止してから所定時間経過したとき、水道水温計測部７の計測値と湯温計測部９の計測値と雰囲気温度計測部８の計測値とに基づいて、水漏れ判定を実行する。図３に戻って説明すると、漏水判定部３４は、湯温計測部９の計測値と雰囲気温度計測部８の計測値との差の絶対値が所定温度（例えば５℃）以下であるか否かを判定する（＃３５）。 Therefore, the water leakage determination unit 34 in this embodiment determines the measured value of the tap water temperature measuring unit 7, the measured value of the hot water temperature measuring unit 9, and the measured value of the atmosphere temperature measuring unit 8 when a predetermined time has elapsed since the hot water supply was stopped. Water leakage determination is performed based on the following. Returning to FIG. 3, the water leakage determination unit 34 determines whether the absolute value of the difference between the measured value of the hot water temperature measuring unit 9 and the measured value of the ambient temperature measuring unit 8 is equal to or lower than a predetermined temperature (for example, 5° C.). (#35).

＃３５の判定の結果、漏水判定部３４は、湯温計測部９の計測値と雰囲気温度計測部８の計測値との差の絶対値が所定温度（例えば５℃）以下であれば、水漏れが無いと判定し、この判定結果を記憶部３７に記憶させる（＃３７、＃４０）。一方、＃３５の判定の結果、漏水判定部３４は、湯温計測部９の計測値と雰囲気温度計測部８の計測値との差の絶対値が所定温度より大きければ、湯温計測部９の計測値が、雰囲気温度計測部８の計測値よりも水道水温計測部７の計測値に近い値か否かを判定する（＃３６）。つまり、湯温計測部９の計測値が水道水の温度に近い温度へと収束しているか否か判定する。なお、水道水温計測部７の計測値に代えて、水温計測部５４の計測値を用いても良い。これは、貯湯器１内の空気の温度が出湯の有無により変動が殆どなく、給水配管５１内の水の温度は、水道水の温度に近い温度となっているためである。 As a result of the determination in #35, the water leakage determination unit 34 determines that if the absolute value of the difference between the measurement value of the hot water temperature measurement unit 9 and the measurement value of the ambient temperature measurement unit 8 is below a predetermined temperature (for example, 5°C), the water leakage determination unit 34 It is determined that there is no leakage, and this determination result is stored in the storage unit 37 (#37, #40). On the other hand, as a result of the determination in #35, if the absolute value of the difference between the measured value of the hot water temperature measuring section 9 and the measured value of the ambient temperature measuring section 8 is greater than the predetermined temperature, the water leakage determining section 34 determines that the water temperature measuring section 9 It is determined whether the measured value is closer to the measured value of the tap water temperature measuring section 7 than the measured value of the ambient temperature measuring section 8 (#36). That is, it is determined whether the measured value of the hot water temperature measurement unit 9 has converged to a temperature close to the temperature of tap water. Note that instead of the measured value of the tap water temperature measuring section 7, the measured value of the water temperature measuring section 54 may be used. This is because the temperature of the air in the water storage device 1 hardly changes depending on whether or not there is hot water, and the temperature of the water in the water supply pipe 51 is close to the temperature of tap water.

＃３６の判定の結果、漏水判定部３４は、湯温計測部９の計測値が、雰囲気温度計測部８の計測値よりも水道水温計測部７の計測値に近い値であれば、水漏れが有ると判定し、報知部３６を作動させる（＃３８、＃３９）。一方、漏水判定部３４は、湯温計測部９の計測値が、水道水温計測部７の計測値よりも雰囲気温度計測部８の計測値に近い値、つまり、出湯配管１４内の湯の温度が雰囲気温度に近づくように徐々に変化していれば、水漏れが無いと判定する（＃３７）。そして、これらの判定結果を記憶部３７に記憶させて、水漏れ判定を終了する（＃４０）。なお、漏水判定部３４による判定は、一定時間継続して実行しても良い。また、＃３５及び＃３６の判定のうち、いずれか一方を用いても良い。 As a result of the determination in #36, if the measured value of the hot water temperature measuring section 9 is closer to the measured value of the tap water temperature measuring section 7 than the measured value of the ambient temperature measuring section 8, the water leakage determining section 34 determines that there is a water leak. It is determined that there is, and the notification section 36 is activated (#38, #39). On the other hand, the water leak determination unit 34 determines that the measured value of the hot water temperature measuring unit 9 is a value closer to the measured value of the ambient temperature measuring unit 8 than the measured value of the tap water temperature measuring unit 7, that is, the temperature of hot water in the hot water tap pipe 14. If the temperature is gradually changing so as to approach the ambient temperature, it is determined that there is no water leakage (#37). Then, these determination results are stored in the storage unit 37, and the water leak determination is ended (#40). Note that the determination by the water leak determination unit 34 may be continuously performed for a certain period of time. Further, either one of the determinations #35 and #36 may be used.

このように、本実施形態では、出湯待機中において、水道水温計測部７の計測値と湯温計測部９の計測値と雰囲気温度計測部８の計測値とに基づいて水漏れ判定を実行する。つまり、給湯システムＸの水漏れの有無により温度変化の挙動が異なる出湯配管１４の湯温に基づいて水漏れ判定を実行すれば、水漏れ判定が正確なものとなる。また、本実施形態のように、湯温計測部９の計測値と雰囲気温度計測部８の計測値との差の絶対値が所定温度以下となれば水漏れが無いと判定すれば、水漏れ判定が正確なものとなる。さらに、湯温計測部９の計測値が、雰囲気温度計測部８の計測値よりも水道水温計測部７の計測値に近い値であるとき、水漏れが有ると判定すれば、水漏れ判定が正確なものとなる。 In this way, in this embodiment, water leakage determination is performed based on the measured value of the tap water temperature measuring section 7, the measured value of the hot water temperature measuring section 9, and the measured value of the atmosphere temperature measuring section 8 while waiting for hot water to be tapped. . In other words, if the water leakage determination is performed based on the hot water temperature of the hot water outlet pipe 14, which changes in temperature depending on whether or not there is a water leakage in the hot water supply system X, the water leakage determination will be accurate. Further, as in the present embodiment, if it is determined that there is no water leakage if the absolute value of the difference between the measurement value of the hot water temperature measurement unit 9 and the measurement value of the ambient temperature measurement unit 8 becomes a predetermined temperature or less, water leakage is detected. Judgment becomes accurate. Further, if it is determined that there is a water leak when the measured value of the hot water temperature measuring section 9 is closer to the measured value of the tap water temperature measuring section 7 than the measured value of the ambient temperature measuring section 8, the water leakage determination is made. It will be accurate.

また、学習部３８が学習した出湯期間に基づいて水漏れ判定を実行すれば、貯湯器１の使用頻度の少ないときに水漏れ判定を実行できるため、水漏れ判定中に再度出湯開始され、水漏れ判定精度が低下する不都合を防止できる。さらに、記憶部３７に記憶した水漏れ判定の結果に基づいて水漏れ判定の実行頻度を変更することが好ましい。これにより、水漏れの無い場合には不必要な水漏れ判定によるエネルギー消費を削減可能となり、水漏れの有る場合には、判定頻度を上げることで水漏れ判定の信頼度を高めることができる。 Furthermore, if the water leakage determination is executed based on the hot water supply period learned by the learning unit 38, the water leakage determination can be executed when the hot water storage device 1 is used less frequently. It is possible to prevent the inconvenience of a decrease in leakage determination accuracy. Furthermore, it is preferable to change the execution frequency of water leak determination based on the water leak determination result stored in the storage unit 37. This makes it possible to reduce energy consumption due to unnecessary water leak determination when there is no water leak, and increases the reliability of water leak determination by increasing the frequency of determination when there is water leak.

（第二実施形態の判定フロー）
図４～図６を用いて、第二実施形態における水漏れ判定装置１００の判定方法について説明する。なお、本実施形態は、第一実施形態と同時に、又は並行して実行しても良いため、第一実施形態と異なる構成のみ説明する。 (Determination flow of second embodiment)
The determination method of the water leak determination device 100 in the second embodiment will be described using FIGS. 4 to 6. Note that this embodiment may be executed simultaneously or in parallel with the first embodiment, so only the configurations that are different from the first embodiment will be described.

図４に示すように、判定実行部３３は、貯湯器１が出湯を停止したか否かを監視し、水漏れ判定を開始するか否か判定する（＃４１）。流量計測部４０の計測値が所定値（例えば２リットル毎分）以上から所定値未満となった出湯停止後、水漏れ判定を実行する（＃４１Ｙｅｓ）。このとき、学習部１６が学習した出湯期間のうち、出湯しない確率の比較的高い時間帯に水漏れ判定を開始することが好ましい。 As shown in FIG. 4, the determination execution unit 33 monitors whether or not the hot water storage device 1 has stopped dispensing hot water, and determines whether or not to start water leak determination (#41). After the hot water supply is stopped when the measured value of the flow rate measurement unit 40 falls from a predetermined value (for example, 2 liters per minute) or more to less than a predetermined value, water leakage determination is performed (#41 Yes). At this time, it is preferable to start the water leakage determination during a time period during which the hot water supply period learned by the learning unit 16 has a relatively high probability that hot water will not be discharged.

図５（ａ）と（ｂ）の実線で示すように、雰囲気温度計測部８の計測値が出湯目標温度よりも高い場合、流量計測部４０の計測値は、水漏れの有無により変化方向が異なり、図６（ａ）と（ｂ）の実線で示すように、雰囲気温度計測部８の計測値が出湯目標温度よりも低い場合、流量計測部４０の計測値は、水漏れの有無により変化方向が同一であるが、変化勾配が異なる。 As shown by the solid lines in FIGS. 5(a) and 5(b), when the measured value of the ambient temperature measuring section 8 is higher than the hot water outlet target temperature, the measured value of the flow rate measuring section 40 changes in the direction of change depending on the presence or absence of water leakage. On the other hand, as shown by the solid lines in FIGS. 6(a) and 6(b), when the measured value of the ambient temperature measuring section 8 is lower than the hot water tap target temperature, the measured value of the flow rate measuring section 40 changes depending on the presence or absence of water leakage. The direction is the same, but the gradient of change is different.

そこで、本実施形態における漏水判定部３４は、流量計測部４０の計測値が所定値以上から所定値未満となった出湯停止後、湯温計測部９の計測値の変化率に基づいて水漏れ判定を実行する。図４に戻って説明すると、漏水判定部３４は、湯温計測部９の計測値の変化率（湯温の変化勾配）を取得し、雰囲気温度計測部８の計測値が出湯目標温度よりも高いか否かを判定する（＃４２、＃４３）。 Therefore, the water leakage determination unit 34 in this embodiment determines whether water leaks based on the rate of change in the measurement value of the hot water temperature measurement unit 9 after the hot water supply is stopped when the measurement value of the flow rate measurement unit 40 goes from a predetermined value or more to less than a predetermined value. Execute judgment. Returning to FIG. 4, the water leakage determination unit 34 acquires the rate of change of the measured value of the hot water temperature measuring unit 9 (change gradient of hot water temperature), and determines that the measured value of the ambient temperature measuring unit 8 is lower than the hot water outlet target temperature. It is determined whether it is high or not (#42, #43).

雰囲気温度計測部８の計測値が出湯目標温度よりも高い場合（＃４３Ｙｅｓ）、漏水判定部３４は、湯温計測部９の計測値が上昇勾配か否かを判定する（＃４４）。漏水判定部３４は、＃４４の判定の結果、湯温計測部９の計測値が上昇勾配であれば（Ｙｅｓ判定）、水漏れが無いと判定し、この判定結果を記憶部３７に記憶させる（＃４６、＃４９）。一方、漏水判定部３４は、＃４４の判定の結果、湯温計測部９の計測値が下降勾配であれば（Ｎо判定）、水漏れが有ると判定し、報知部３６を作動させ、この判定結果を記憶部３７に記憶させる（＃４７、＃４８、＃４９）。 If the measured value of the ambient temperature measuring section 8 is higher than the hot water outlet target temperature (#43 Yes), the water leakage determining section 34 determines whether the measured value of the hot water temperature measuring section 9 has an upward slope (#44). As a result of the determination in #44, if the measured value of the hot water temperature measurement unit 9 has an upward slope (Yes determination), the water leak determination unit 34 determines that there is no water leak, and stores this determination result in the storage unit 37. (#46, #49). On the other hand, if the measured value of the hot water temperature measuring section 9 is at a downward slope as a result of the determination in #44 (No determination), the water leak determination section 34 determines that there is a water leak, activates the notification section 36, and The determination result is stored in the storage unit 37 (#47, #48, #49).

雰囲気温度計測部８の計測値が出湯目標温度よりも低い場合（＃４３Ｎо）、漏水判定部３４は、湯温計測部９の計測値の下降勾配が所定勾配より急勾配か否かを判定する（＃４５）。漏水判定部３４は、＃４５の判定の結果、湯温計測部９の計測値の下降勾配が急勾配であれば（Ｙｅｓ判定）、水漏れが有ると判定し、報知部３６を作動させ、この判定結果を記憶部３７に記憶させる（＃４７、＃４８、＃４９）。一方、漏水判定部３４は、＃４４の判定の結果、湯温計測部９の計測値の下降勾配が緩勾配であれば（Ｎо判定）、水漏れが無いと判定し、この判定結果を記憶部３７に記憶させる（＃４６、＃４９）。なお、漏水判定部３４による判定は、一定時間継続して実行しても良い。 If the measured value of the ambient temperature measuring unit 8 is lower than the hot water outlet target temperature (#43No), the water leak determining unit 34 determines whether the downward slope of the measured value of the hot water temperature measuring unit 9 is steeper than a predetermined slope. (#45). If the result of the determination in #45 is that the downward slope of the measured value of the hot water temperature measurement unit 9 is steep (Yes determination), the water leak determination unit 34 determines that there is a water leak, and activates the notification unit 36. This determination result is stored in the storage unit 37 (#47, #48, #49). On the other hand, if the result of the determination in #44 is that the descending slope of the measured value of the hot water temperature measuring section 9 is gentle (No determination), the water leak determination unit 34 determines that there is no water leak, and stores this determination result. 37 (#46, #49). Note that the determination by the water leak determination unit 34 may be continuously performed for a certain period of time.

このように、本実施形態では、出湯待機中の初期である出湯を停止したとき、湯温計測部９の計測値の変化率に基づいて水漏れ判定を実行すれば、水漏れ判定が正確なものとなる。 In this way, in the present embodiment, if water leakage is determined based on the rate of change in the measured value of the hot water temperature measurement unit 9 when hot water is stopped at the initial stage of waiting for hot water to be tapped, water leakage can be accurately determined. Become something.

［その他の実施形態］
（１）漏水判定部３４に対する水漏れ判定の実行指示を受け付ける入力部を設けても良い。この入力部は、例えばタッチパネルや、ボタン式のリモコンで構成される。また、水漏れ判定を実行する貯湯器１の待機状態は、使用者が給湯停止指示を入力してから所定時間経過後であっても良い。
（２）水漏れ判定装置１００は、水温計測部５４を備えていなくても良い。第二実施形態において、出湯中は湯温計測部９の計測値が出湯目標温度に近付くことから、図４の＃４３における出湯目標温度に代えて湯温計測部９の計測値を用いても良い。
（３）流量計測部４０を給湯器１０内部に設けたが、貯湯器１内部の調整弁６よりも下流側の出湯配管１４に設けても良い。
（４）漏水判定部３４における判定閾値は、学習部１６により学習させて変更可能に構成しても良い。 [Other embodiments]
(1) An input unit may be provided that receives an instruction to the water leakage determination unit 34 to perform water leakage determination. This input section is composed of, for example, a touch panel or a button-type remote control. Further, the standby state of the water storage device 1 in which water leakage determination is performed may be after a predetermined period of time has elapsed since the user inputs an instruction to stop hot water supply.
(2) The water leak determination device 100 does not need to include the water temperature measuring section 54. In the second embodiment, since the measured value of the hot water temperature measuring unit 9 approaches the hot water tap target temperature during hot water dispensing, the measured value of the hot water temperature measuring unit 9 may be used instead of the hot water tap target temperature in #43 of FIG. good.
(3) Although the flow rate measurement unit 40 is provided inside the water heater 10, it may be provided in the hot water outlet pipe 14 on the downstream side of the regulating valve 6 inside the water storage device 1.
(4) The determination threshold value in the water leak determination section 34 may be configured to be learned by the learning section 16 and can be changed.

本発明は、貯湯器を有する給湯システムの水漏れ判定装置に利用可能である。 INDUSTRIAL APPLICATION This invention can be utilized for the water leak determination apparatus of the hot water supply system which has a water storage device.

１ ：貯湯器
４ ：貯湯タンク（貯留槽）
６ ：調整弁
７ ：水道水温計測部
８ ：雰囲気温度計測部
９ ：湯温計測部
１４ ：出湯配管
３３ ：漏水判定部（判定部）
３４ ：判定実行部（判定部）
３６ ：報知部
４０ ：流量計測部
５１ ：給水配管
５２ ：出湯配管
１００ ：判定装置
Ｗ ：水道管
Ｘ ：給湯システム 1: Hot water storage device 4: Hot water storage tank (storage tank)
6: Adjustment valve 7: Water temperature measurement section 8: Ambient temperature measurement section 9: Hot water temperature measurement section 14: Hot water outlet piping 33: Water leakage determination section (determination section)
34: Judgment execution unit (judgment unit)
36: Notifying unit 40: Flow rate measuring unit 51: Water supply pipe 52: Hot water outlet pipe 100: Determination device W: Water pipe X: Hot water supply system

Claims (6)

水が流通する給水配管と、前記給水配管から流入した水を加熱して湯として貯留する貯留槽と、前記貯留槽に貯留された湯を流出させる出湯配管と、前記出湯配管に前記給水配管の水を合流させる水量を調整する調整弁とを備えた貯湯器を有する給湯システムの水漏れ判定装置であって、
前記貯湯器の外部で前記給水配管に接続された水道管を流通する水の温度を計測する水道水温計測部と、
前記貯湯器の内部空気の温度を計測する雰囲気温度計測部と、
前記調整弁よりも下流側で前記貯湯器の内部に位置する前記出湯配管を流通する湯の温度を計測する湯温計測部と、
前記給湯システムの水漏れ判定を実行する判定部と、を備え、
前記判定部は、前記貯湯器が出湯停止してから出湯開始するまでの待機状態で前記調整弁が前記給水配管の水を前記出湯配管に流通可能な弁位置にあるとき、前記水道水温計測部の計測値、前記湯温計測部の計測値及び前記雰囲気温度計測部の計測値に基づいて前記水漏れ判定を実行する給湯システムの水漏れ判定装置。 A water supply pipe through which water flows, a storage tank that heats the water that flows in from the water supply pipe and stores it as hot water, a hot water outlet pipe that drains the hot water stored in the storage tank, and a hot water outlet pipe that connects the water supply pipe to the hot water outlet pipe. A water leak determination device for a hot water supply system having a water storage device equipped with an adjustment valve that adjusts the amount of water to be combined,
a tap water temperature measurement unit that measures the temperature of water flowing through a water pipe connected to the water supply pipe outside the water storage device;
an atmosphere temperature measurement unit that measures the temperature of the internal air of the water storage device;
a hot water temperature measuring unit that measures the temperature of hot water flowing through the hot water outlet pipe located inside the hot water storage device on the downstream side of the regulating valve;
a determination unit that executes a water leak determination of the hot water supply system,
The determination unit is configured to determine the tap water temperature measurement unit when the regulating valve is in a valve position that allows water from the water supply pipe to flow to the hot water supply pipe in a standby state from when the hot water storage device stops dispensing hot water until when it starts dispensing hot water. A water leak determination device for a hot water supply system that executes the water leak determination based on a measured value of the hot water temperature measuring section, a measured value of the hot water temperature measuring section, and a measured value of the ambient temperature measuring section. 前記判定部は、前記湯温計測部の計測値と前記雰囲気温度計測部の計測値との差の絶対値が所定温度以下となれば水漏れが無いと判定する請求項１に記載の給湯システムの水漏れ判定装置。 The water supply system according to claim 1, wherein the determination unit determines that there is no water leakage if the absolute value of the difference between the measurement value of the hot water temperature measurement unit and the measurement value of the ambient temperature measurement unit is equal to or lower than a predetermined temperature. water leak detection device. 前記判定部は、前記湯温計測部の計測値が、前記雰囲気温度計測部の計測値よりも前記水道水温計測部の計測値に近い値であるとき、水漏れが有ると判定する請求項１又は２に記載の給湯システムの水漏れ判定装置。 Claim 1: The determining unit determines that there is a water leak when the measured value of the hot water temperature measuring unit is closer to the measured value of the tap water temperature measuring unit than the measured value of the ambient temperature measuring unit. Or a water leak determination device for a hot water supply system according to 2. 前記出湯配管を流通する湯の流量を計測する流量計測部をさらに備え、
前記判定部は、前記流量計測部の計測値が所定値未満であるときに前記待機状態にあるとして、前記水漏れ判定を実行する請求項１から３のいずれか一項に記載の給湯システムの水漏れ判定装置。 further comprising a flow rate measurement unit that measures the flow rate of hot water flowing through the hot water tap piping,
The hot water supply system according to any one of claims 1 to 3, wherein the determining unit determines that the water leak is in the standby state when the measured value of the flow rate measuring unit is less than a predetermined value. Water leak detection device. 前記判定部は、前記流量計測部の計測値が前記所定値以上から前記所定値未満となった出湯停止後、前記湯温計測部の計測値の変化率に基づいて前記水漏れ判定を実行する請求項４に記載の給湯システムの水漏れ判定装置。 The determination unit executes the water leakage determination based on the rate of change of the measurement value of the hot water temperature measurement unit after the hot water supply is stopped when the measurement value of the flow rate measurement unit becomes less than the predetermined value from the predetermined value or more. A water leak determination device for a hot water supply system according to claim 4. 前記判定部による前記水漏れ判定の結果を報知する報知部をさらに備え、
前記報知部は、前記判定部により水漏れが有ると判定されたときに作動するように構成されている請求項１から５のいずれか一項に記載の給湯システムの水漏れ判定装置。 further comprising a notification unit that notifies the result of the water leak determination by the determination unit,
The water leak determination device for a hot water supply system according to any one of claims 1 to 5, wherein the notification unit is configured to operate when the determination unit determines that there is a water leak.
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007170753A (en) 2005-12-22 2007-07-05 Denso Corp Water heater
JP2009222326A (en) 2008-03-18 2009-10-01 Rinnai Corp Hot water supply system
JP2013245852A (en) 2012-05-24 2013-12-09 Mitsubishi Electric Corp Storage water heater
JP2014199157A (en) 2013-03-29 2014-10-23 株式会社ガスター Heat source device
JP2018036101A (en) 2016-08-30 2018-03-08 トヨタホーム株式会社 Water leakage detection system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007170753A (en) 2005-12-22 2007-07-05 Denso Corp Water heater
JP2009222326A (en) 2008-03-18 2009-10-01 Rinnai Corp Hot water supply system
JP2013245852A (en) 2012-05-24 2013-12-09 Mitsubishi Electric Corp Storage water heater
JP2014199157A (en) 2013-03-29 2014-10-23 株式会社ガスター Heat source device
JP2018036101A (en) 2016-08-30 2018-03-08 トヨタホーム株式会社 Water leakage detection system

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