JP2024034062A

JP2024034062A - hot water storage hot water system

Info

Publication number: JP2024034062A
Application number: JP2022138066A
Authority: JP
Inventors: 和久丸山; 和毅品川
Original assignee: Noritz Corp
Current assignee: Noritz Corp
Priority date: 2022-08-31
Filing date: 2022-08-31
Publication date: 2024-03-13

Abstract

【課題】高温出湯回避通路によらずに高温給湯を防ぐことができる貯湯給湯システムを提供すること。【解決手段】主熱源機４によって加熱された湯水を貯湯する貯湯タンク２を有する貯湯ユニット３と、貯湯ユニットから出湯される湯水を加熱又は非加熱で給湯する補助熱源機５を備え、貯湯ユニットが貯湯タンクからの湯水と上水を混合して補助熱源機に出湯するように構成された貯湯給湯システム１において、貯湯ユニットから出湯される湯水の温度を検知する出湯温度検知手段１２ｃを備え、補助熱源機は、出湯温度検知手段の検知温度に基づいた湯水の加熱運転を行うための送風ファンとバーナと熱交換器と制御部とを有し、制御部は、出湯温度検知手段の検知温度が予め設定された規定温度以上の場合に、加熱運転を行わずに熱交換器に貯湯ユニットから出湯された湯水を流通させて送風ファンを駆動する。【選択図】図１An object of the present invention is to provide a hot water storage and hot water supply system that can prevent high temperature hot water supply without using a high temperature hot water discharge avoidance passage. [Solution] The hot water storage unit includes a hot water storage unit 3 having a hot water storage tank 2 that stores hot water heated by a main heat source device 4, and an auxiliary heat source device 5 that supplies hot water with or without heating from the hot water storage unit. A hot water storage and hot water supply system 1 configured to mix hot water and tap water from a hot water storage tank and discharge the hot water to an auxiliary heat source device, includes hot water temperature detection means 12c that detects the temperature of hot water discharged from the hot water storage unit, The auxiliary heat source device includes a blower fan, a burner, a heat exchanger, and a control section for heating hot water based on the temperature detected by the hot water outlet temperature detection means, and the control section is configured to control the temperature detected by the hot water outlet temperature detection means. When the temperature is equal to or higher than a preset specified temperature, the hot water discharged from the hot water storage unit is circulated through the heat exchanger to drive the ventilation fan without performing a heating operation. [Selection diagram] Figure 1

Description

本発明は、主熱源機で加熱して貯湯した湯水を給湯に使用する貯湯給湯システムに関する。 The present invention relates to a hot water storage and hot water supply system that uses hot water heated and stored in a main heat source machine for hot water supply.

従来から、加熱運転効率が高い主熱源機として例えばヒートポンプ式熱源機で加熱された湯水を貯湯タンクに貯湯し、この貯湯タンクの湯水を給湯に使用する貯湯給湯システムが広く利用されている。貯湯給湯システムは、主熱源機と、貯湯タンクを備えた貯湯ユニットと、主熱源機よりも加熱能力が大きい例えば燃焼式の補助熱源機を備えている。 Conventionally, hot water storage and hot water supply systems have been widely used, in which hot water heated by a heat pump type heat source device as a main heat source device with high heating operation efficiency is stored in a hot water storage tank, and the hot water in the hot water storage tank is used for hot water supply. A hot water storage and hot water supply system includes a main heat source device, a hot water storage unit including a hot water storage tank, and an auxiliary heat source device, such as a combustion type, which has a larger heating capacity than the main heat source device.

貯湯給湯システムには、貯湯ユニットから出湯された湯水が、補助熱源機を介して給湯栓に給湯されるように構成されたものがある。この貯湯給湯システムは、給湯栓の開栓により給湯使用が開始されると、貯湯ユニットの湯水混合部において貯湯タンクからの高温の湯水と上水とが混合され、温度が調整された湯水が貯湯ユニットから出湯される。そして、貯湯ユニットから出湯された湯水が、補助熱源機を介して給湯栓に給湯される。 Some hot water storage and hot water supply systems are configured so that hot water discharged from a hot water storage unit is supplied to a hot water tap via an auxiliary heat source device. In this hot water storage and hot water supply system, when hot water supply starts by opening the hot water tap, high-temperature hot water from the hot water storage tank and tap water are mixed in the hot water mixing section of the hot water storage unit, and the hot water whose temperature has been adjusted is stored. Hot water is drawn from the unit. The hot water discharged from the hot water storage unit is then supplied to the hot water faucet via the auxiliary heat source device.

このとき補助熱源機は、貯湯ユニットから出湯された湯水の温度に応じて加熱して又は非加熱で給湯する。補助熱源機による加熱運転は、給湯設定温度の給湯が可能な温度の湯水が貯湯タンクにない場合に行い、貯湯ユニットから出湯された湯水を給湯設定温度になるように加熱して給湯する。一方、貯湯ユニットで給湯設定温度に調整された湯水が出湯される場合には、非加熱で給湯する。 At this time, the auxiliary heat source device supplies hot water with or without heating depending on the temperature of the hot water discharged from the hot water storage unit. Heating operation by the auxiliary heat source device is performed when there is no hot water in the hot water storage tank at a temperature that allows hot water supply at the hot water supply set temperature, and hot water is supplied by heating the hot water discharged from the hot water storage unit to the hot water supply set temperature. On the other hand, when the hot water storage unit discharges hot water adjusted to the hot water supply set temperature, the hot water is supplied without heating.

補助熱源機による加熱運転では、貯湯ユニットからの湯水を給湯設定温度に加熱するために、加熱能力を調整する。このとき、貯湯タンクの湯水温度が給湯設定温度未満であって給湯設定温度に近い温度の場合には、補助熱源機の最小加熱能力で加熱しても給湯設定温度よりも高温の給湯になる虞がある。そのため、補助熱源機で加熱する場合には、湯水混合部で上水を混合して所定の目標出湯温度以下に温度を下げた湯水を貯湯ユニットから出湯し、補助熱源機の加熱運転によって給湯設定温度に調整して給湯する。 In heating operation using the auxiliary heat source device, the heating capacity is adjusted in order to heat the hot water from the hot water storage unit to the hot water supply setting temperature. At this time, if the hot water temperature in the hot water storage tank is lower than the hot water supply setting temperature but close to the hot water supply setting temperature, there is a risk that the hot water will be hotter than the hot water supply setting temperature even if heated with the minimum heating capacity of the auxiliary heat source device. There is. Therefore, when heating with an auxiliary heat source device, hot water is mixed in the hot water mixing section to lower the temperature below a predetermined target hot water temperature, and then the hot water is discharged from the hot water storage unit, and the hot water supply setting is set by the heating operation of the auxiliary heat source device. Adjust the temperature and supply hot water.

ところで、貯湯ユニットの湯水混合部において貯湯タンクからの湯水と上水の混合に不具合が生じた場合、貯湯ユニットから給湯設定温度よりも高温の湯水が出湯される虞がある。この場合、補助熱源機は、この高温の湯水を非加熱でそのまま給湯することになり、給湯使用者が予期しない高温の給湯によって火傷の危険がある。 By the way, if a problem occurs in mixing hot water from the hot water storage tank with clean water in the hot water mixing section of the hot water storage unit, there is a possibility that hot water having a higher temperature than the hot water supply setting temperature may be discharged from the hot water storage unit. In this case, the auxiliary heat source device supplies the high-temperature hot water as it is without heating it, and there is a risk that the user of the hot water supply will suffer burns due to unexpected high-temperature water supply.

それ故、貯湯ユニットには、予め設定された規定温度以上の高温の出湯を回避するために、図５のように湯水混合部をバイパスして出湯通路に上水を供給するための高温出湯回避通路３１と、この通路を開閉する高温出湯回避弁３２が装備されている。そして、出湯通路に規定温度以上の高温の湯水が流通した場合に高温出湯回避弁３２を開けることによって、高温出湯回避通路３１を介して供給される上水が出湯通路の高温の湯水に混合され、温度が下がった湯水が給湯される。 Therefore, in order to avoid high-temperature hot water supply exceeding a preset specified temperature, the hot water storage unit is equipped with a high-temperature hot water discharge system that bypasses the hot water mixing section and supplies clean water to the hot water supply passage, as shown in Figure 5. It is equipped with a passage 31 and a high-temperature hot water release avoidance valve 32 that opens and closes this passage. When hot water with a temperature higher than a specified temperature flows through the hot water tap passage, by opening the high temperature hot water tap avoidance valve 32, the clean water supplied through the high temperature hot tap tap avoidance passage 31 is mixed with the hot water in the hot water tap passage. , hot water whose temperature has dropped is supplied.

一方、高温の給湯を回避するものではないが、特許文献１のように、メンテナンス作業において貯湯タンクから安全に排水する技術が知られている。この特許文献１では、貯湯タンクの高温の湯水を、補助熱源機の熱交換器との間で循環させながら、補助熱源機の送風ファンを作動させて熱交換器で冷却することによって、貯湯タンクの湯水の温度を下げる。そして、安全な温度まで冷却された湯水が貯湯タンクから排水される。 On the other hand, although it does not avoid high-temperature hot water supply, there is a known technology for safely draining water from a hot water storage tank during maintenance work, as disclosed in Patent Document 1. In Patent Document 1, high-temperature hot water in a hot water storage tank is circulated between a heat exchanger of an auxiliary heat source device, a blower fan of the auxiliary heat source device is operated, and the heat exchanger cools the hot water in the hot water storage tank. Lower the temperature of the hot water. The hot water that has been cooled to a safe temperature is then drained from the hot water storage tank.

また、貯湯給湯システムではないが、特許文献２には、即湯循環運転と浴槽の追い焚き循環運転を行う給湯機において、一方の循環運転によって他方の循環運転の加熱対象の湯水が熱交換器内で高温になっている場合に、この他方の循環運転開始前に送風ファンを駆動して熱交換器内の湯水を冷却する技術が記載されている。 In addition, although it is not a hot water storage hot water supply system, Patent Document 2 describes a water heater that performs an instant hot water circulation operation and a bathtub reheating circulation operation, in which hot water to be heated in the other circulation operation is transferred to a heat exchanger by one circulation operation. A technique is described in which, when the temperature inside the heat exchanger is high, a blower fan is driven to cool the hot water inside the heat exchanger before the start of circulation operation on the other side.

特許第４１０１１４４号公報Patent No. 4101144 特許第３２５２８７９号公報Patent No. 3252879

上記のように、貯湯ユニットから出湯された湯水が補助熱源機を介して給湯されるように構成された貯湯給湯システムは、貯湯タンクからの湯水と上水の混合に不具合がない正常な状態では、給湯設定温度又は目標出湯温度以下の湯水が補助熱源機に出湯される。そして、この正常な状態では、高温出湯回避弁が閉止されているので、貯湯給湯システムの使用期間が長くなると、高温出湯回避弁が例えば閉止状態で固着して、正常に作動させることができなくなってしまう虞がある。それ故、高温出湯回避通路によらずに高温の給湯を防ぐことが検討されている。 As mentioned above, a hot water storage and hot water supply system configured so that the hot water discharged from the hot water storage unit is supplied via an auxiliary heat source device is under normal conditions where there is no problem in the mixing of hot water from the hot water storage tank and tap water. , Hot water at a temperature lower than the hot water supply set temperature or the target hot water output temperature is discharged to the auxiliary heat source device. In this normal state, the high-temperature hot water release avoidance valve is closed, so if the hot water storage and hot water supply system is used for a long time, the high-temperature hot water release avoidance valve may become stuck in the closed state, making it impossible to operate normally. There is a risk that it will happen. Therefore, it is being considered to prevent high temperature hot water from being supplied without using a high temperature hot water discharge avoidance passage.

しかし、貯湯給湯システムが貯湯タンクと補助熱源機の間で湯水を循環可能なよう構成されていないので、特許文献１のように貯湯タンクと補助熱源機の間で湯水を循環させて冷却することはできない。また、給湯栓の開度に応じた流量の湯水が補助熱源機を流通するので、特許文献２のように給湯機の熱交換器で循環開始前の静止した湯水を冷却する場合よりも、補助熱源機の熱交換器で湯水を冷却することが困難である。 However, since the hot water storage and hot water supply system is not configured to circulate hot water between the hot water storage tank and the auxiliary heat source device, it is not possible to cool the hot water by circulating hot water between the hot water storage tank and the auxiliary heat source device as in Patent Document 1. I can't. In addition, since hot water flows through the auxiliary heat source device at a flow rate that corresponds to the opening degree of the hot water faucet, the auxiliary heat source is more efficient than when the water heater's heat exchanger cools stationary hot water before the circulation starts, as in Patent Document 2. It is difficult to cool hot water with the heat exchanger of the heat source machine.

そこで、本発明は、高温出湯回避通路によらずに高温の給湯を防ぐことができる貯湯給湯システムを提供することを目的としている。 SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a hot water storage and hot water supply system that can prevent hot water from being supplied without using a hot water discharge avoidance passage.

請求項１の発明の貯湯給湯システムは、主熱源機によって加熱された湯水を貯湯する貯湯タンクを有する貯湯ユニットと、前記貯湯ユニットから出湯される湯水を加熱して又は非加熱で給湯する補助熱源機を備え、前記貯湯ユニットが前記貯湯タンクからの湯水と上水を混合して前記補助熱源機に出湯するように構成された貯湯給湯システムにおいて、前記貯湯ユニットから出湯される湯水の温度を検知する出湯温度検知手段を備え、前記補助熱源機は、前記出湯温度検知手段の検知温度に基づいて湯水の加熱運転を行うために、送風ファンとバーナと熱交換器と、前記加熱運転を制御する制御部を有し、前記制御部は、前記出湯温度検知手段の検知温度が予め設定された規定温度以上の場合に、前記加熱運転を行わずに前記熱交換器に前記貯湯ユニットから出湯された湯水を流通させて前記送風ファンを駆動することを特徴としている。 The hot water storage and hot water supply system of the invention according to claim 1 includes a hot water storage unit having a hot water storage tank for storing hot water heated by a main heat source machine, and an auxiliary heat source for heating or non-heating the hot water discharged from the hot water storage unit. In the hot water storage and hot water supply system, the hot water storage unit is configured to mix hot water and tap water from the hot water storage tank and discharge the hot water to the auxiliary heat source device, the temperature of the hot water discharged from the hot water storage unit is detected. The auxiliary heat source device controls a blower fan, a burner, a heat exchanger, and the heating operation in order to perform a heating operation of hot water based on the temperature detected by the hot water output temperature detection means. The control unit is configured to control the hot water to be discharged from the hot water storage unit to the heat exchanger without performing the heating operation when the detected temperature of the hot water supply temperature detection means is equal to or higher than a preset specified temperature. It is characterized in that the blower fan is driven by circulating hot water.

上記構成によれば、貯湯給湯システムは、貯湯ユニットから出湯される湯水の温度に基づいて、この出湯された湯水を補助熱源機が加熱して又は非加熱で給湯するように構成されている。そして、補助熱源機の加熱運転を制御する制御部は、貯湯ユニットから出湯された湯水の温度が規定温度以上の場合には、この出湯された湯水を熱交換器に流通させて送風ファンを駆動することによって冷却する。従って、補助熱源機を介して給湯される湯水は、貯湯ユニットから出湯されたときよりも低温になるので、高温の給湯を防ぐことができる。 According to the above configuration, the hot water storage and hot water supply system is configured such that the auxiliary heat source device heats or unheats the discharged hot water based on the temperature of the hot water discharged from the hot water storage unit. Then, when the temperature of the hot water discharged from the hot water storage unit is higher than a specified temperature, the control unit that controls the heating operation of the auxiliary heat source device causes the discharged hot water to flow through the heat exchanger and drives the blower fan. Cool by cooling. Therefore, hot water supplied via the auxiliary heat source device has a lower temperature than when hot water is discharged from the hot water storage unit, so hot water supply at a high temperature can be prevented.

請求項２の発明の貯湯給湯システムは、請求項１の発明において、前記制御部は、前記送風ファンを最大回転数で駆動することを特徴としている。
上記構成によれば、補助熱源機の送風ファンを最大回転数で駆動することによって最大風量で送風するので、熱交換器における冷却能力が大きくなり、貯湯ユニットから出湯された湯水を最大限冷却して高温の給湯を防ぐことができる。 A hot water storage and hot water supply system according to a second aspect of the invention is characterized in that, in the first aspect of the invention, the control section drives the blower fan at a maximum rotation speed.
According to the above configuration, the blower fan of the auxiliary heat source device is driven at the maximum rotation speed to blow air at the maximum air volume, so the cooling capacity of the heat exchanger increases and the hot water discharged from the hot water storage unit is cooled to the maximum extent. This can prevent hot water from being heated to high temperatures.

請求項３の発明の貯湯給湯システムは、請求項１又は２の発明において、前記補助熱源機は、給湯流量調整弁を有し、前記制御部は、前記出湯温度検知手段の検知温度が前記規定温度以上の場合に、前記給湯流量調整弁の開度を絞ることを特徴としている。
上記構成によれば、貯湯ユニットから出湯された湯水の温度が規定温度以上の場合に給湯流量調整弁の開度を絞るので、補助熱源機を介して給湯される湯水の流量を小さくすることができる。従って、補助熱源機の熱交換器を流通する湯水の流量を小さくすることによって、この熱交換器で湯水の温度を大きく下げることができるので、高温の給湯を防ぐことができる。また、給湯栓を大きく開けても給湯される湯水が少量になるので、給湯使用者が貯湯給湯システムの異常発生に気づき易くなり、異常発生に気づいた給湯使用者が自発的に給湯栓を閉止するように促すことができる。 In the hot water storage and hot water supply system of the invention according to claim 3, in the invention according to claim 1 or 2, the auxiliary heat source device has a hot water supply flow rate regulating valve, and the control unit is configured to adjust the temperature detected by the hot water output temperature detection means to the specified temperature. It is characterized in that when the temperature is higher than that, the opening degree of the hot water supply flow rate regulating valve is reduced.
According to the above configuration, when the temperature of the hot water discharged from the hot water storage unit is equal to or higher than the specified temperature, the opening degree of the hot water supply flow rate adjustment valve is reduced, so it is possible to reduce the flow rate of hot water supplied via the auxiliary heat source device. can. Therefore, by reducing the flow rate of hot water flowing through the heat exchanger of the auxiliary heat source device, the temperature of the hot water can be significantly lowered by this heat exchanger, thereby preventing high-temperature hot water from being supplied. In addition, even if the hot water tap is opened wide, only a small amount of hot water is supplied, making it easier for hot water users to notice abnormalities in the hot water storage system, and when they notice an abnormality, they voluntarily close the hot water tap. You can encourage them to do so.

請求項４の発明の貯湯給湯システムは、請求項１又は２の発明において、前記補助熱源機は、前記熱交換器と前記熱交換器をバイパスするバイパス通路とに湯水を分配する分配弁を有し、前記制御部は、前記出湯温度検知手段の検知温度が前記規定温度以上の場合に、前記熱交換器への分配比が最大となるように前記分配弁を駆動することを特徴としている。
上記構成によれば、貯湯ユニットから出湯された湯水の温度が規定温度以上の場合に熱交換器への分配比を最大にすることによって、貯湯ユニットから出湯された湯水の大部分を補助熱源機の熱交換器に流通させて冷却することができるので、高温の給湯を防ぐことができる。 In the hot water storage hot water supply system of the invention of claim 4, in the invention of claim 1 or 2, the auxiliary heat source device has a distribution valve that distributes hot water to the heat exchanger and a bypass passage that bypasses the heat exchanger. The control unit is characterized in that, when the temperature detected by the outlet hot water temperature detection means is equal to or higher than the specified temperature, the control unit drives the distribution valve so that the distribution ratio to the heat exchanger is maximized.
According to the above configuration, by maximizing the distribution ratio to the heat exchanger when the temperature of the hot water dispensed from the hot water storage unit is higher than a specified temperature, most of the hot water dispensed from the hot water storage unit is transferred to the auxiliary heat source. Since hot water can be cooled by flowing through a heat exchanger, hot water can be prevented from being supplied at high temperatures.

本発明の貯湯給湯システムによれば、高温出湯回避通路によらずに高温の給湯を防ぐことができ、従来装備されていた高温出湯回避通路と高温出湯回避弁を省略することができる。 According to the hot water storage and hot water supply system of the present invention, it is possible to prevent hot water from being supplied without using the high temperature hot water discharge avoidance passage, and the high temperature hot water discharge avoidance passage and the high temperature hot water discharge avoidance valve that are conventionally provided can be omitted.

本発明の実施例に係る貯湯給湯システムの説明図である。FIG. 1 is an explanatory diagram of a hot water storage and hot water supply system according to an embodiment of the present invention. 図１の補助熱源機の説明図である。FIG. 2 is an explanatory diagram of the auxiliary heat source device of FIG. 1. FIG. 給湯運転制御のフローチャートである。It is a flowchart of hot water supply operation control. 高温給湯回避動作制御のフローチャートである。It is a flowchart of high temperature hot water supply avoidance operation control. 高温出湯回避通路と高温出湯回避弁を備えた貯湯給湯システムの１例である。This is an example of a hot water storage and hot water supply system equipped with a high temperature hot water discharge avoidance passage and a high temperature hot water discharge avoidance valve.

以下、本発明を実施するための形態について実施例に基づいて説明する。 EMBODIMENT OF THE INVENTION Hereinafter, the form for implementing this invention is demonstrated based on an Example.

最初に、本発明の貯湯給湯システム１の構成について、図１に基づいて説明する。
貯湯給湯システム１は、貯湯タンク２を備えた貯湯ユニット３と、例えばヒートポンプ式の主熱源機４と、例えば燃焼式の補助熱源機５を有する。この貯湯給湯システム１は、主熱源機４で所定の目標貯湯温度に加熱された湯水を貯湯タンク２に貯湯する貯湯運転を行う。補助熱源機５は、貯湯ユニット３から出湯された湯水を、その温度に応じて加熱して、又は非加熱で、給湯栓６に給湯する。 First, the configuration of the hot water storage and hot water supply system 1 of the present invention will be explained based on FIG. 1.
The hot water storage and hot water supply system 1 includes a hot water storage unit 3 including a hot water storage tank 2, a main heat source device 4 of, for example, a heat pump type, and an auxiliary heat source device 5 of, for example, a combustion type. This hot water storage and hot water supply system 1 performs a hot water storage operation in which hot water heated to a predetermined target hot water storage temperature by a main heat source device 4 is stored in a hot water storage tank 2 . The auxiliary heat source device 5 heats the hot water discharged from the hot water storage unit 3 according to its temperature, or supplies hot water to the hot water tap 6 without heating.

次に、貯湯ユニット３について説明する。
貯湯タンク２の下部には、主熱源機４に貯湯タンク２の湯水を供給するために、ポンプ７を備えた主熱源機往き通路８が接続されている。貯湯タンク２の上部には、主熱源機４で加熱された湯水を貯湯タンク２に貯湯するための主熱源機戻り通路９が接続されている。主熱源機戻り通路９の途中には、湯水の流路を切り替える切替弁１０が配設され、この切替弁１０において主熱源機戻り通路９から分岐された戻り分岐通路９ａが、主熱源機往き通路８のポンプ７よりも上流部分に接続されている。 Next, the hot water storage unit 3 will be explained.
A main heat source machine going passage 8 equipped with a pump 7 is connected to the lower part of the hot water storage tank 2 in order to supply hot water from the hot water storage tank 2 to the main heat source machine 4 . A main heat source return passage 9 for storing hot water heated by the main heat source device 4 in the hot water storage tank 2 is connected to the upper part of the hot water storage tank 2 . A switching valve 10 for switching the hot water flow path is disposed in the middle of the main heat source machine return passage 9, and a return branch passage 9a branched from the main heat source machine return passage 9 at this switching valve 10 is connected to the main heat source machine return passage 9. It is connected to a portion of the passage 8 upstream of the pump 7.

主熱源機戻り通路９の切替弁１０よりも上流側には、主熱源機４で加熱された湯水の温度を検知する戻り温度センサ９ｂが配設されている。例えば主熱源機４の起動直後における戻り温度センサ９ｂの検知温度が所定の貯湯設定温度よりも低い場合に、切替弁１０を貯湯タンク２側から戻り分岐通路９ａ側に切り替えて、十分に加熱できるようになるまで貯湯タンク２に湯水を戻さずに循環させることができる。 A return temperature sensor 9b that detects the temperature of hot water heated by the main heat source device 4 is disposed upstream of the switching valve 10 in the main heat source device return passage 9. For example, if the temperature detected by the return temperature sensor 9b immediately after starting the main heat source device 4 is lower than the predetermined hot water storage setting temperature, the switching valve 10 is switched from the hot water storage tank 2 side to the return branch passage 9a side to ensure sufficient heating. Hot water can be circulated without returning to the hot water storage tank 2 until it reaches the desired temperature.

貯湯タンク２の底部には、矢印ＣＷで示す上水を供給する給水通路１１が接続されている。貯湯タンク２の頂部には、貯湯ユニット３から貯湯タンク２の湯水を出湯するための出湯通路１２が接続されている。出湯通路１２の途中には、混合弁１４（湯水混合部）が配設されている。この混合弁１４には、給水通路１１の途中から分岐された給水分岐通路１１ａが接続されている。そして、貯湯タンク２からの湯水と給水分岐通路１１ａからの上水とが、混合弁１４で混合されて出湯される。尚、混合弁１４の代わりに、貯湯タンク２側の流量を調整する流量調整弁と、給水分岐通路１１ａ側の流量を調整する流量調整弁とで湯水混合部が構成されていてもよい。 A water supply passage 11 for supplying clean water is connected to the bottom of the hot water storage tank 2, as indicated by an arrow CW. A hot water supply passage 12 for discharging hot water from the hot water storage tank 2 from the hot water storage unit 3 is connected to the top of the hot water storage tank 2 . A mixing valve 14 (hot water mixing section) is disposed in the middle of the hot water outlet passage 12. A water supply branch passage 11a branched from the middle of the water supply passage 11 is connected to the mixing valve 14. Then, the hot water from the hot water storage tank 2 and the clean water from the water supply branch passage 11a are mixed by the mixing valve 14 and the hot water is discharged. Note that, instead of the mixing valve 14, the hot water mixing section may be configured with a flow rate adjusting valve that adjusts the flow rate on the hot water storage tank 2 side and a flow rate adjusting valve that adjusts the flow rate on the water supply branch passage 11a side.

貯湯タンク２には、複数の貯湯温度センサ２ａ～２ｄが高さ方向に所定の間隔を空けて配設されており、貯湯タンク２に貯湯された湯水の温度とその温度の湯水の貯湯量を検知することができる。そして、貯湯された湯水の降温を防ぐため、これら貯湯温度センサ２ａ～２ｄと貯湯タンク２を覆うように図示外の保温材が配設されている。 A plurality of hot water temperature sensors 2a to 2d are arranged in the hot water storage tank 2 at predetermined intervals in the height direction, and measure the temperature of hot water stored in the hot water storage tank 2 and the amount of hot water stored at that temperature. Can be detected. In order to prevent the temperature of the stored hot water from decreasing, a heat insulating material (not shown) is provided to cover the hot water temperature sensors 2a to 2d and the hot water storage tank 2.

給水通路１１には、給水通路１１から供給される上水の温度（給水温度）を検知する給水温度センサ１１ｂが配設されている。出湯通路１２には、貯湯ユニット３からの出湯流量を検知する出湯流量センサ１２ａと、貯湯タンク２から出湯される湯水の温度を検知する貯湯タンク出湯温度センサ１２ｂと、貯湯ユニット３からの出湯温度を検知する出湯温度センサ１２ｃ（出湯温度検知手段）が配設されている。 A water supply temperature sensor 11b is disposed in the water supply passage 11 to detect the temperature of the clean water (water supply temperature) supplied from the water supply passage 11. The hot water outlet passage 12 includes a hot water outlet flow rate sensor 12 a that detects the flow rate of hot water coming from the hot water storage unit 3 , a hot water tank outlet temperature sensor 12 b that detects the temperature of hot water dispensed from the hot water storage tank 2 , and a hot water outlet temperature sensor 12 b that detects the temperature of hot water dispensed from the hot water storage tank 2 . A hot water outlet temperature sensor 12c (outlet hot water temperature detection means) is provided to detect the hot water outlet temperature.

貯湯ユニット３の出湯通路１２と補助熱源機５の給水口５ａが湯水通路１５によって接続されている。補助熱源機５の給湯口５ｂには、給湯栓６に接続された湯水通路１６が接続されている。貯湯ユニット３から出湯された湯水は、補助熱源機５を介して給湯栓６に給湯される。 The hot water outlet passage 12 of the hot water storage unit 3 and the water supply port 5a of the auxiliary heat source device 5 are connected by a hot water passage 15. A hot water passage 16 connected to a hot water tap 6 is connected to the hot water inlet 5b of the auxiliary heat source device 5. Hot water discharged from the hot water storage unit 3 is supplied to a hot water tap 6 via an auxiliary heat source device 5.

貯湯運転では、主熱源機４とポンプ７を駆動して貯湯タンク２と主熱源機４の間で湯水を循環させ、主熱源機４で加熱した湯水を貯湯タンク２の上部から貯湯する。貯湯ユニット３は、この貯湯運転と貯湯ユニット３から出湯する湯水の温度調整を制御する貯湯ユニット制御部１８を有する。貯湯ユニット制御部１８と補助熱源機５には、例えば給湯設定温度等を給湯使用者が設定するための操作端末１９が接続されている。尚、操作端末１９は複数台接続されていてもよく、貯湯ユニット３に対応する操作端末１９が貯湯ユニット制御部１８に接続され、補助熱源機５に対応する操作端末が補助熱源機５に接続されていてもよい。 In the hot water storage operation, the main heat source device 4 and the pump 7 are driven to circulate hot water between the hot water storage tank 2 and the main heat source device 4, and the hot water heated by the main heat source device 4 is stored from the upper part of the hot water storage tank 2. The hot water storage unit 3 includes a hot water storage unit control section 18 that controls the hot water storage operation and temperature adjustment of hot water discharged from the hot water storage unit 3. An operation terminal 19 is connected to the hot water storage unit control section 18 and the auxiliary heat source device 5, and is used by a hot water supply user to set, for example, a hot water supply temperature setting. Note that a plurality of operation terminals 19 may be connected, and the operation terminal 19 corresponding to the hot water storage unit 3 is connected to the hot water storage unit control section 18, and the operation terminal corresponding to the auxiliary heat source device 5 is connected to the auxiliary heat source device 5. may have been done.

次に、補助熱源機５について説明する。
図２に示すように、補助熱源機５は、給水口５ａと給湯口５ｂを接続する給湯通路２１と、給湯通路２１の途中に配設された熱交換器２２と、送風ファン２３と、送風ファン２３から送られる空気を利用して燃料ガスを燃焼させるバーナ２４を有する。給湯通路２１を流通する湯水は、送風ファン２３によって熱交換器２２に送られるバーナ２４の燃焼ガスの熱（燃焼熱）を利用して、熱交換器２２で加熱される。熱交換器２２は、燃焼ガスの顕熱を利用する一次熱交換器と燃焼ガスの潜熱を利用する二時熱交換器によって構成され、燃焼ガスとの熱交換のために大きい表面積を備えている。 Next, the auxiliary heat source device 5 will be explained.
As shown in FIG. 2, the auxiliary heat source device 5 includes a hot water supply passage 21 that connects the water supply inlet 5a and the hot water supply inlet 5b, a heat exchanger 22 disposed in the middle of the hot water supply passage 21, a ventilation fan 23, and a ventilation fan 23. It has a burner 24 that burns fuel gas using air sent from a fan 23. Hot water flowing through the hot water supply passage 21 is heated in the heat exchanger 22 using the heat (combustion heat) of the combustion gas of the burner 24 that is sent to the heat exchanger 22 by the blower fan 23 . The heat exchanger 22 is composed of a primary heat exchanger that uses the sensible heat of the combustion gas and a secondary heat exchanger that uses the latent heat of the combustion gas, and has a large surface area for heat exchange with the combustion gas. .

給湯通路２１は熱交換器２２の上流側に分配弁２５を有し、この分配弁２５において給湯通路２１からバイパス通路２６が分岐されている。また、給湯通路２１は熱交換器２２の下流側に給湯流量調整弁２７を有し、熱交換器２２と給湯流量調整弁２７の間にバイパス通路２６が熱交換器２２をバイパスして接続されている。分配弁２５は、給水口５ａから入水した湯水を熱交換器２２側の給湯通路２１とバイパス通路２６とに、分配比を調整して分配する。給湯流量調整弁２７は、補助熱源機５から給湯される湯水の流量を調整する。 The hot water supply passage 21 has a distribution valve 25 on the upstream side of the heat exchanger 22, and a bypass passage 26 is branched from the hot water supply passage 21 at this distribution valve 25. Further, the hot water supply passage 21 has a hot water supply flow rate adjustment valve 27 on the downstream side of the heat exchanger 22, and a bypass passage 26 is connected between the heat exchanger 22 and the hot water supply flow rate adjustment valve 27, bypassing the heat exchanger 22. ing. The distribution valve 25 distributes the hot water entering from the water supply port 5a to the hot water supply passage 21 on the heat exchanger 22 side and the bypass passage 26 by adjusting the distribution ratio. The hot water supply flow rate adjustment valve 27 adjusts the flow rate of hot water supplied from the auxiliary heat source device 5.

補助熱源機５は、給湯流量調整弁２７において給湯通路２１から分岐された湯張り通路２８を介して浴槽に湯水を供給することができる。また、補助熱源機５は、説明を省略するが、浴槽の湯水の追い焚き機能と温水暖房機能を備えている。 The auxiliary heat source device 5 can supply hot water to the bathtub via a hot water filling passage 28 branched from the hot water supply passage 21 at the hot water supply flow rate regulating valve 27 . Further, the auxiliary heat source device 5 has a function of reheating hot water in the bathtub and a hot water heating function, although the explanation will be omitted.

給湯通路２１は、入水温度センサ５ｃと、給湯温度センサ５ｄと、給湯流量センサ５ｅを有する。入水温度センサ５ｃは、給水口５ａから入水する湯水の入水温度を検知する。給湯温度センサ５ｄは、補助熱源機５を介して給湯される湯水の給湯温度を検知する。給湯流量センサ５ｅは、分配弁２５によって熱交換器２２側に分配された湯水の流量を検知し、この流量と分配弁２５の分配比に基づいて補助熱源機５を介して給湯される湯水の流量が算出される。貯湯ユニット３から出湯された湯水は、補助熱源機５を介して給湯栓６に供給され、給湯栓６から矢印ＨＷで示すように給湯される（図１参照）。 The hot water supply passage 21 has an inlet water temperature sensor 5c, a hot water supply temperature sensor 5d, and a hot water supply flow rate sensor 5e. The inlet water temperature sensor 5c detects the inlet temperature of hot water that enters from the water supply port 5a. The hot water temperature sensor 5d detects the temperature of hot water supplied via the auxiliary heat source device 5. The hot water supply flow rate sensor 5e detects the flow rate of hot water distributed to the heat exchanger 22 side by the distribution valve 25, and adjusts the flow rate of the hot water supplied via the auxiliary heat source device 5 based on this flow rate and the distribution ratio of the distribution valve 25. The flow rate is calculated. Hot water discharged from the hot water storage unit 3 is supplied to the hot water tap 6 via the auxiliary heat source device 5, and hot water is supplied from the hot water tap 6 as shown by arrow HW (see FIG. 1).

補助熱源機５は、貯湯タンク２に貯湯されている湯水の温度では給湯設定温度の給湯ができない場合に、バーナ２４の燃焼熱を利用して、貯湯ユニット３から出湯された湯水を熱交換器２２で加熱する加熱運転を行う。加熱運転の加熱能力は、貯湯ユニット３から出湯された湯水の温度に応じてバーナ２４における燃焼量を調整することによって調整される。そして、熱交換器２２で加熱された湯水とバイパス通路２６からの湯水が混合され、給湯設定温度に調整された湯水が給湯される。 The auxiliary heat source device 5 uses the combustion heat of the burner 24 to transfer the hot water discharged from the hot water storage unit 3 to the heat exchanger when the hot water stored in the hot water storage tank 2 cannot supply hot water at the set temperature. A heating operation is performed at step 22. The heating capacity of the heating operation is adjusted by adjusting the amount of combustion in the burner 24 according to the temperature of hot water discharged from the hot water storage unit 3. Then, the hot water heated by the heat exchanger 22 and the hot water from the bypass passage 26 are mixed, and the hot water adjusted to the hot water supply set temperature is supplied.

加熱運転と、この加熱運転による給湯を制御するために、補助熱源機５は、入水温度センサ５ｃと給湯温度センサ５ｄの検知温度に基づいて、送風ファン２３と分配弁２５と給湯流量調整弁２７の駆動を制御する補助熱源機制御部２９（制御部）を備えている。図示を省略するが、補助熱源機制御部２９には、操作端末１９が接続され、貯湯ユニット制御部１８と通信するための通信線が接続されている。 In order to control the heating operation and hot water supply by this heating operation, the auxiliary heat source device 5 operates the blower fan 23, the distribution valve 25, and the hot water supply flow rate adjustment valve 27 based on the detected temperatures of the inlet water temperature sensor 5c and the hot water supply temperature sensor 5d. The auxiliary heat source device control section 29 (control section) is provided to control the driving of the auxiliary heat source device. Although not shown, an operation terminal 19 is connected to the auxiliary heat source device control section 29, and a communication line for communicating with the hot water storage unit control section 18 is connected thereto.

次に貯湯給湯システム１の給湯運転制御について図３のフローチャートに基づいて説明する。図中のＳｉ（ｉ＝１，２，・・・）はステップを表す。この給湯運転制御は、貯湯ユニット制御部１８と補助熱源機制御部２９とが通信により連携して行い、湯水温度、流量のような検知情報及び判定結果は貯湯ユニット制御部１８と補助熱源機制御部２９とで共有される。 Next, hot water supply operation control of the hot water storage and hot water supply system 1 will be explained based on the flowchart of FIG. 3. Si (i=1, 2, . . . ) in the figure represents a step. This hot water supply operation control is performed by the hot water storage unit control section 18 and the auxiliary heat source device control section 29 in cooperation with each other through communication, and detection information such as hot water temperature and flow rate and judgment results are sent to the hot water storage unit control section 18 and the auxiliary heat source device control section. It is shared with Department 29.

給湯運転制御が開始されると、Ｓ１において出湯流量センサ１２ａが検知する出湯流量が、予め設定された最低作動流量以上であるか否か判定する。このＳ１は給湯開始の判定ステップであり、例えば給湯栓６の開栓による給湯使用の開始に伴って貯湯ユニット３からの出湯開始を検知するために、貯湯ユニット制御部１８が繰り返しＳ１の判定を行うように構成されている。最低作動流量は、貯湯給湯システム１が温度を給湯設定温度で給湯するために予め設定された流量である。Ｓ１の判定がＹｅｓの場合はＳ２に進む。Ｓ１の判定がＮｏの場合はＳ１の判定を繰り返す。 When the hot water supply operation control is started, it is determined in S1 whether the hot water flow rate detected by the hot water flow rate sensor 12a is equal to or higher than a preset minimum operating flow rate. This step S1 is a step for determining the start of hot water supply. For example, in order to detect the start of discharging hot water from the hot water storage unit 3 in conjunction with the start of hot water supply by opening the hot water tap 6, the hot water storage unit control unit 18 repeatedly performs the determination in S1. is configured to do so. The minimum operating flow rate is a preset flow rate for the hot water storage and hot water supply system 1 to supply hot water at a hot water supply set temperature. If the determination in S1 is Yes, the process advances to S2. If the determination in S1 is No, the determination in S1 is repeated.

次にＳ２において、貯湯タンク出湯温度センサ１２ｂで検知される貯湯タンク２からの湯水温度が、給湯設定温度以上であるか否か判定する。Ｓ２は、貯湯ユニット制御部１８が貯湯タンク２内の給湯設定温度で給湯可能な湯水の有無を判定するステップであり、貯湯温度センサ２ａ～２ｄの検知温度に基づいて判定することもできる。Ｓ２の判定がＹｅｓの場合はＳ３に進む。Ｓ２の判定がＮｏの場合はＳ６に進む。 Next, in S2, it is determined whether the temperature of hot water from the hot water storage tank 2 detected by the hot water storage tank outlet temperature sensor 12b is equal to or higher than the hot water supply setting temperature. S2 is a step in which the hot water storage unit control unit 18 determines whether there is hot water that can be supplied at the hot water supply setting temperature in the hot water storage tank 2, and the determination can also be made based on the temperature detected by the hot water storage temperature sensors 2a to 2d. If the determination in S2 is Yes, the process advances to S3. If the determination in S2 is No, the process advances to S6.

次にＳ３において、混合弁１４で貯湯タンク２からの湯水と上水を混合することによって給湯設定温度に調整した湯水を貯湯ユニット３から出湯し、出湯通路１２に接続された湯水通路１５を介して補助熱源機５に供給してＳ４に進む。このとき、貯湯ユニット制御部１８は、貯湯タンク出湯温度センサ１２ｂの検知温度と、給水温度センサ１１ｂの検知温度と、出湯流量センサ１２ａの検知流量に基づいて、出湯温度センサ１２ｃの検知温度が給湯設定温度になるように、混合弁１４を駆動して混合比を調整する。 Next, in S3, the hot water from the hot water storage tank 2 and tap water are mixed with the hot water from the hot water storage tank 2 by the mixing valve 14, and the hot water adjusted to the hot water supply set temperature is discharged from the hot water storage unit 3, and is supplied through the hot water passage 15 connected to the hot water supply passage 12. The heat source is supplied to the auxiliary heat source device 5, and the process proceeds to S4. At this time, the hot water storage unit control section 18 determines whether the temperature detected by the hot water outlet temperature sensor 12c is the same as the temperature detected by the hot water outlet temperature sensor 12c based on the detected temperature by the hot water storage tank outlet temperature sensor 12b, the detected temperature by the supplied water temperature sensor 11b, and the detected flow rate by the outlet flow rate sensor 12a. The mixing ratio is adjusted by driving the mixing valve 14 so that the set temperature is achieved.

次にＳ４において、貯湯ユニット３から出湯された湯水を補助熱源機５で加熱せずに、開栓された給湯栓６に湯水通路１６を介して給湯してＳ５に進む。補助熱源機制御部２９は、入水温度センサ５ｃの検知温度が給湯設定温度であるため、加熱運転を行わずにそのまま流通させる。Ｓ２の判定で給湯設定温度の湯水が補助熱源機５に入水することが既に分かっているので、入水温度センサ５ｃの検知温度に関わらず加熱運転を開始しないようにしてもよい。 Next, in S4, the hot water dispensed from the hot water storage unit 3 is not heated by the auxiliary heat source device 5, but is supplied to the opened hot water tap 6 via the hot water passage 16, and the process proceeds to S5. Since the temperature detected by the incoming water temperature sensor 5c is the hot water supply setting temperature, the auxiliary heat source device control unit 29 allows the hot water to flow as it is without performing a heating operation. Since it is already known from the determination in S2 that hot water at the set hot water supply temperature will enter the auxiliary heat source device 5, the heating operation may not be started regardless of the temperature detected by the incoming water temperature sensor 5c.

次にＳ５において、出湯流量が最低作動流量未満であるか否か判定する。給湯使用の終了により給湯運転を終了することを判定するステップである。Ｓ５の判定がＹｅｓの場合はリターンし、次の給湯使用に備えて給湯運転制御がＳ１から開始される。Ｓ５の判定がＮｏの場合はＳ２に戻る。 Next, in S5, it is determined whether the tapping flow rate is less than the minimum operating flow rate. This is a step of determining whether to end the hot water supply operation due to the end of hot water use. If the determination in S5 is Yes, the process returns and hot water supply operation control is started from S1 in preparation for the next use of hot water supply. If the determination in S5 is No, the process returns to S2.

Ｓ２の判定がＮｏの場合には、Ｓ６において、混合弁１４で貯湯タンク２からの湯水と上水を混合することによって給湯設定温度よりも低温の目標出湯温度以下に調整した湯水を貯湯ユニット３から出湯し、補助熱源機５に供給してＳ７に進む。目標出湯温度は給湯設定温度よりも例えば１０℃低い温度に設定され、貯湯ユニット制御部１８は出湯温度センサ１２ｃの検知温度が目標出湯温度になるように混合弁１４の混合比を調整する。目標出湯温度で出湯することによって、補助熱源機５が最小加熱能力で加熱運転を行った場合でも給湯設定温度に調整して給湯することができる。貯湯タンク２の湯水の温度によっては、目標出湯温度よりも低温の湯水が貯湯ユニット３から出湯されるが、補助熱源機５で給湯設定温度に調整して給湯することができる。 If the determination in S2 is No, in S6, the mixing valve 14 mixes the hot water from the hot water storage tank 2 with tap water to supply the hot water adjusted to a target hot water output temperature which is lower than the hot water supply set temperature to the hot water storage unit 3. Hot water is tapped from the hot water, supplied to the auxiliary heat source device 5, and the process proceeds to S7. The target hot water outlet temperature is set to a temperature lower, for example, by 10° C. than the hot water supply setting temperature, and the hot water storage unit control section 18 adjusts the mixing ratio of the mixing valve 14 so that the temperature detected by the outlet hot water temperature sensor 12c becomes the target hot water outlet temperature. By discharging hot water at the target hot water supply temperature, even if the auxiliary heat source device 5 performs heating operation at the minimum heating capacity, hot water can be supplied while adjusting the hot water supply set temperature. Depending on the temperature of the hot water in the hot water storage tank 2, hot water at a temperature lower than the target hot water output temperature is discharged from the hot water storage unit 3, but the auxiliary heat source device 5 can adjust the hot water supply temperature to the hot water supply setting temperature and then supply hot water.

次にＳ７において、貯湯ユニット３から出湯された湯水を補助熱源機５で加熱して給湯設定温度に調整し、開栓された給湯栓６に給湯してＳ８に進む。補助熱源機制御部２９は、入水温度センサ５ｃの検知温度に基づいて加熱能力を調整する。 Next, in S7, the hot water dispensed from the hot water storage unit 3 is heated by the auxiliary heat source device 5, adjusted to the hot water supply set temperature, and hot water is supplied to the opened hot water tap 6, and the process proceeds to S8. The auxiliary heat source device control unit 29 adjusts the heating capacity based on the temperature detected by the incoming water temperature sensor 5c.

次にＳ８において、給湯流量が最低作動流量未満であるか否か判定する。給湯使用の終了により給湯運転を終了することを判定するステップである。Ｓ８の判定がＮｏの場合はＳ６に戻る。Ｓ８の判定がＹｅｓの場合はＳ９に進む。そして、Ｓ９において補助熱源機５による湯水の加熱を停止してリターンし、次の給湯使用に備えて給湯運転制御がＳ１から開始される。 Next, in S8, it is determined whether the hot water supply flow rate is less than the minimum operating flow rate. This is a step of determining whether to end the hot water supply operation due to the end of hot water use. If the determination in S8 is No, the process returns to S6. If the determination in S8 is Yes, the process advances to S9. Then, in S9, heating of hot water by the auxiliary heat source device 5 is stopped and the process returns, and hot water supply operation control is started from S1 in preparation for the next use of hot water supply.

上記のように給湯運転制御では、貯湯ユニット３から出湯される湯水の温度は、混合弁１４によって給湯設定温度又は給湯設定温度よりも低い目標出湯温度以下に調整されている。しかし、例えば混合弁１４の故障によって、貯湯タンク２からの高温の湯水と低温の上水の混合に不具合が発生し、貯湯タンク２からの湯水が高温のまま出湯される虞がある。このとき、補助熱源機５は、貯湯ユニット３から出湯された湯水を非加熱でそのまま給湯するので、給湯設定温度よりも高温の湯水が給湯され危険である。 In the hot water supply operation control as described above, the temperature of hot water discharged from the hot water storage unit 3 is adjusted by the mixing valve 14 to the hot water supply set temperature or a target hot water discharge temperature lower than the hot water supply set temperature. However, for example, due to a failure of the mixing valve 14, a problem may occur in mixing the high temperature hot water from the hot water storage tank 2 with the low temperature tap water, and there is a risk that the hot water from the hot water storage tank 2 may be discharged while remaining at a high temperature. At this time, the auxiliary heat source device 5 supplies hot water directly from the hot water storage unit 3 without heating it, which is dangerous because the hot water is hotter than the hot water supply setting temperature.

そこで、貯湯給湯システム１は、出湯温度センサ１２ｃの検知温度が予め設定された規定温度以上である場合に、高温の湯水が給湯されないように補助熱源機５において冷却動作を行う。この冷却動作の制御について、図４に基づいて説明する。この冷却動作制御は、給湯運転制御と同様に貯湯ユニット制御部１８と補助熱源機制御部２９とが通信により連携して行い、給湯使用の開始によって開始される。 Therefore, the hot water storage and hot water supply system 1 performs a cooling operation in the auxiliary heat source device 5 so that hot water at a high temperature is not supplied when the detected temperature of the hot water output temperature sensor 12c is equal to or higher than a preset specified temperature. Control of this cooling operation will be explained based on FIG. 4. Similar to the hot water supply operation control, this cooling operation control is performed by the hot water storage unit control section 18 and the auxiliary heat source device control section 29 in cooperation through communication, and is started when the use of hot water supply starts.

冷却動作制御が開始されると、Ｓ１１において出湯温度が予め設定された規定温度以上であるか否か判定する。このＳ１１は貯湯ユニット３からの高温出湯の判定ステップであり、混合弁１４における上水の混合の不具合を検知するために、貯湯ユニット制御部１８が繰り返しＳ１１の判定を行うように構成されている。規定温度は、長時間接触しなければ火傷しない温度として例えば５０℃に設定されている。 When the cooling operation control is started, it is determined in S11 whether the tapped water temperature is equal to or higher than a preset specified temperature. This step S11 is a step for determining whether high-temperature hot water is dispensed from the hot water storage unit 3, and the hot water storage unit control unit 18 is configured to repeatedly perform the determination in S11 in order to detect a malfunction in mixing clean water in the mixing valve 14. . The specified temperature is set to, for example, 50° C., which is a temperature that does not cause burns unless it is touched for a long time.

Ｓ１１の判定がＹｅｓの場合はＳ１２に進む。Ｓ１１の判定がＮｏの場合はＳ１１の判定を繰り返す。尚、Ｓ１１の判定は、入水温度センサ５ｃの検知温度に基づいて補助熱源機制御部２９が行うこともできるが、貯湯ユニット制御部１８が上流側で高温の湯水を検知することにより、高温の給湯を防止する時間を確保し易くなる。この判定結果は補助熱源機制御部２９に送信されて共有される。 If the determination in S11 is Yes, the process advances to S12. If the determination in S11 is No, the determination in S11 is repeated. Note that the determination in S11 can be made by the auxiliary heat source device control section 29 based on the temperature detected by the incoming water temperature sensor 5c, but the hot water storage unit control section 18 detects high temperature hot water on the upstream side. It becomes easier to secure time to prevent hot water supply. This determination result is transmitted to the auxiliary heat source device control unit 29 and shared.

次にＳ１２において、補助熱源機５の送風ファン２３を最大回転数で駆動させてＳ１３に進む。補助熱源機制御部２９は、高温の湯水が入水することがわかっているので、入水温度センサ５ｃが検知する前に加熱運転を開始せずに送風ファン２３の駆動を開始することができる。そして熱交換器２２を流通する高温の湯水が、送風される空気との熱交換によって冷却されるので、温度が下がった湯水が給湯栓６に給湯され、危険が小さくなる。 Next, in S12, the blower fan 23 of the auxiliary heat source device 5 is driven at the maximum rotation speed, and the process proceeds to S13. Since the auxiliary heat source device control unit 29 knows that high-temperature hot water will enter the water, it can start driving the blower fan 23 without starting the heating operation before the incoming water temperature sensor 5c detects it. Since the high-temperature hot water flowing through the heat exchanger 22 is cooled by heat exchange with the blown air, the hot water with a lower temperature is supplied to the hot water tap 6, reducing the danger.

次にＳ１３において、補助熱源機５の給湯流量調整弁２７の開度を絞ってＳ１４に進む。給湯栓６の開度が大きくても高温の湯水の流量が小さくなるので、熱交換器２２で温度を大きく下げることができ、危険が一層小さくなる。また、給湯栓６の開度によらず給湯される湯水が少量になるので、給湯使用者に貯湯給湯システム１の異常発生の察知を促すことができ、異常発生に気づいた給湯使用者に給湯栓６の閉栓を促すことができる。 Next, in S13, the opening degree of the hot water supply flow rate regulating valve 27 of the auxiliary heat source device 5 is reduced, and the process proceeds to S14. Even if the opening degree of the hot water tap 6 is large, the flow rate of high-temperature hot water is small, so the temperature can be significantly lowered by the heat exchanger 22, and the danger is further reduced. In addition, since the amount of hot water supplied is small regardless of the opening degree of the hot water faucet 6, it is possible to prompt the hot water supply user to detect the occurrence of an abnormality in the hot water storage and hot water supply system 1. Closing of the stopper 6 can be encouraged.

次にＳ１４において、補助熱源機５の分配弁２５を、熱交換器２２への分配比が最大となるように駆動してＳ１５に進む。入水した高温の湯水の大部分を熱交換器２２に流通させて温度を下げることができるので、危険が一層小さくなる。 Next, in S14, the distribution valve 25 of the auxiliary heat source device 5 is driven so that the distribution ratio to the heat exchanger 22 becomes maximum, and the process proceeds to S15. Since most of the hot water that has entered the water can be passed through the heat exchanger 22 to lower its temperature, the danger is further reduced.

最後にＳ１５において、異常発生時動作を行って終了する。異常発生時動作は、例えば操作端末１９から音声と表示によって異常発生を報知すると共に、貯湯運転、加熱運転等を禁止する。また、例えば貯湯給湯システム１がインターネットを介して貯湯給湯システム１の管理サーバに接続されている場合には、異常発生情報を管理サーバに送信するようにしてもよい。給湯流量調整弁２７が閉止機能を有する場合には、給湯流量調整弁２７の開度を絞った状態で給湯栓６が閉止されて給湯流量がゼロになった後で、給湯流量調整弁２７を閉止して、給湯を禁止してもよい。尚、上記Ｓ１２、Ｓ１３、Ｓ１４，Ｓ１５の順番は入れ替えることが可能であり、同時に行われてもよい。 Finally, in S15, an operation is performed when an abnormality occurs, and the process ends. In the operation when an abnormality occurs, for example, the operating terminal 19 notifies the user of the abnormality through sound and display, and also prohibits hot water storage operation, heating operation, etc. Further, for example, when the hot water storage and hot water supply system 1 is connected to the management server of the hot water storage and hot water supply system 1 via the Internet, the abnormality occurrence information may be transmitted to the management server. When the hot water supply flow rate adjustment valve 27 has a closing function, the hot water supply flow rate adjustment valve 27 is closed after the hot water supply tap 6 is closed with the opening degree of the hot water supply flow rate adjustment valve 27 narrowed down and the hot water supply flow rate becomes zero. It may be closed to prohibit hot water supply. Note that the order of S12, S13, S14, and S15 described above can be changed, and they may be performed at the same time.

以上のように、図１の貯湯給湯システム１は高温の給湯を防止することができるので、例えば図５の従来の貯湯給湯システムに装備されていた高温出湯回避通路３１及びこの通路を開閉する高温出湯回避弁３２を省略している。それ故、高温給湯防止機能を備えながら貯湯給湯システム１の製造コストを低減することができる。 As described above, the hot water storage and hot water supply system 1 shown in FIG. 1 can prevent high-temperature hot water from being supplied. For example, the hot water supply system 1 shown in FIG. The hot water avoidance valve 32 is omitted. Therefore, the manufacturing cost of the hot water storage and hot water supply system 1 can be reduced while providing the high temperature hot water supply prevention function.

上記の貯湯給湯システム１の作用、効果について説明する。
貯湯給湯システム１は、貯湯ユニット３から出湯される湯水の温度に基づいて、この出湯された湯水を補助熱源機５が加熱して又は非加熱で給湯するように構成されている。そして、補助熱源機５の加熱運転を制御する補助熱源機制御部２９（制御部）は、貯湯ユニット３から出湯された湯水の温度が規定温度以上である場合には、この出湯された湯水を熱交換器２２に流通させて送風ファン２３を駆動することによって冷却する。従って、補助熱源機５を介して給湯される湯水は、貯湯ユニット３から出湯されたときよりも低温になるので、高温の給湯を防ぐことができる。 The functions and effects of the hot water storage and hot water supply system 1 described above will be explained.
The hot water storage and hot water supply system 1 is configured such that, based on the temperature of the hot water discharged from the hot water storage unit 3, the auxiliary heat source device 5 heats the discharged hot water or supplies hot water without heating. Then, when the temperature of the hot water dispensed from the hot water storage unit 3 is equal to or higher than the specified temperature, the auxiliary heat source machine control unit 29 (control unit) that controls the heating operation of the auxiliary heat source machine 5 controls the discharged hot water. The air is cooled by flowing through the heat exchanger 22 and driving the blower fan 23. Therefore, the hot water supplied via the auxiliary heat source device 5 is at a lower temperature than when hot water is discharged from the hot water storage unit 3, so hot water can be prevented from being supplied at a high temperature.

このとき、送風ファン２３を最大回転数で駆動して最大風量で送風する。従って、熱交換器２２における冷却能力が最大になり、貯湯ユニット３から出湯された湯水を最大限冷却して高温給湯を防ぐことができる。 At this time, the blower fan 23 is driven at the maximum rotation speed to blow air at the maximum air volume. Therefore, the cooling capacity of the heat exchanger 22 is maximized, and the hot water discharged from the hot water storage unit 3 can be cooled to the maximum extent, thereby preventing high-temperature hot water supply.

また、給湯流量調整弁２７の開度を絞るので、補助熱源機５を介して給湯される湯水の流量を小さくすることができる。従って、貯湯ユニット３から出湯されて熱交換器２２を流通する湯水の温度を熱交換器２２で大きく下げることができるので、高温給湯を防ぐことができる。また、給湯栓６を大きく開けても給湯される湯水が少量になるので、貯湯給湯システム１の異常発生を給湯使用者が気づき易くなり、異常発生に気づいた給湯使用者が給湯栓６を閉止するように促すことができる。 Furthermore, since the opening degree of the hot water supply flow rate regulating valve 27 is narrowed down, the flow rate of hot water supplied via the auxiliary heat source device 5 can be reduced. Therefore, the temperature of hot water discharged from the hot water storage unit 3 and flowing through the heat exchanger 22 can be significantly lowered by the heat exchanger 22, so that high-temperature hot water supply can be prevented. In addition, even if the hot water tap 6 is opened wide, only a small amount of hot water is supplied, making it easier for the hot water supply user to notice the occurrence of an abnormality in the hot water storage and hot water supply system 1. You can encourage them to do so.

熱交換器２２への分配比を最大にすることによって、貯湯ユニット３から出湯された湯水の大部分を熱交換器２２に流通させて冷却することができるので、高温給湯を防ぐことができる。 By maximizing the distribution ratio to the heat exchanger 22, most of the hot water discharged from the hot water storage unit 3 can be passed through the heat exchanger 22 and cooled, thereby preventing high temperature hot water supply.

その他、当業者であれば、本発明の趣旨を逸脱することなく、上記実施形態に種々の変更を付加した形態で実施可能であり、本発明はそのような変更形態を包含するものである。 In addition, those skilled in the art can implement various modifications to the embodiments described above without departing from the spirit of the present invention, and the present invention includes such modifications.

１：貯湯給湯システム
２：貯湯タンク
２ａ～２ｄ：貯湯温度センサ（貯湯熱量検知手段）
３：貯湯ユニット
４：主熱源機
５：補助熱源機
５ａ：入水口
５ｂ：給湯口
５ｃ：入水温度センサ
５ｄ：給湯温度センサ
５ｅ：給湯流量センサ
６：給湯栓
７：ポンプ
８：主熱源機往き通路
９：主熱源機戻り通路
９ａ：戻り分岐通路
１０：切替弁
１１：給水通路
１１ａ：給水分岐通路
１１ｂ：給水温度センサ
１２：出湯通路
１２ａ：出湯流量センサ
１２ｂ：貯湯タンク出湯温度センサ
１２ｃ：出湯温度センサ（出湯温度検知手段）
１４：混合弁（湯水混合部）
１５，１６：湯水通路
１８：貯湯ユニット制御部
１９：操作端末
２１：給湯通路
２２：熱交換器
２３：送風ファン
２４：バーナ
２５：分配弁
２６：バイパス通路
２７：給湯流量調整弁
２８：湯張り通路
２９：補助熱源機制御部（制御部）
３１：高温出湯回避通路
３２：高温出湯回避弁 1: Hot water storage hot water supply system 2: Hot water storage tanks 2a to 2d: Hot water storage temperature sensor (hot water storage heat amount detection means)
3: Hot water storage unit 4: Main heat source machine 5: Auxiliary heat source machine 5a: Water inlet 5b: Hot water supply inlet 5c: Water inlet temperature sensor 5d: Hot water supply temperature sensor 5e: Hot water supply flow rate sensor 6: Hot water tap 7: Pump 8: Main heat source machine forwarding Passage 9: Main heat source unit return passage 9a: Return branch passage 10: Switching valve 11: Water supply passage 11a: Water supply branch passage 11b: Water supply temperature sensor 12: Hot water outlet passage 12a: Hot water outlet flow rate sensor 12b: Hot water storage tank outlet temperature sensor 12c: Hot water outlet Temperature sensor (hot water temperature detection means)
14: Mixing valve (hot water mixing part)
15, 16: Hot water passage 18: Hot water storage unit control unit 19: Operation terminal 21: Hot water supply passage 22: Heat exchanger 23: Blower fan 24: Burner 25: Distribution valve 26: Bypass passage 27: Hot water supply flow rate adjustment valve 28: Hot water filling Passage 29: Auxiliary heat source machine control section (control section)
31: High-temperature hot water discharge avoidance passage 32: High-temperature hot water discharge avoidance valve

Claims

The hot water storage unit includes a hot water storage tank that stores hot water heated by the main heat source device, and an auxiliary heat source device that heats or unheats the hot water discharged from the hot water storage unit, and the hot water storage unit has the hot water storage tank. In a hot water storage and hot water supply system configured to mix hot water and tap water and output the hot water to the auxiliary heat source machine,
comprising hot water temperature detection means for detecting the temperature of hot water discharged from the hot water storage unit,
The auxiliary heat source device includes a blower fan, a burner, a heat exchanger, and a control unit that controls the heating operation in order to perform a heating operation of hot water based on the temperature detected by the hot water temperature detection means,
When the temperature detected by the hot water temperature detection means is equal to or higher than a predetermined temperature, the control unit causes the hot water discharged from the hot water storage unit to flow through the heat exchanger without performing the heating operation. A hot water storage and hot water supply system characterized by driving a blower fan.

The hot water storage and hot water supply system according to claim 1, wherein the control unit drives the blower fan at a maximum rotation speed.

The auxiliary heat source device has a hot water supply flow rate adjustment valve,
3. The hot water storage and hot water supply system according to claim 1, wherein the control unit reduces the opening degree of the hot water supply flow rate regulating valve when the temperature detected by the hot water temperature detection means is equal to or higher than the specified temperature.

The auxiliary heat source device has a distribution valve that distributes hot water to the heat exchanger and a bypass passage that bypasses the heat exchanger,
1 . The control unit drives the distribution valve so that the distribution ratio to the heat exchanger is maximized when the temperature detected by the outlet hot water temperature detection means is equal to or higher than the specified temperature. Or the hot water storage and hot water supply system described in 2.