JP5901920B2 - Solar heat utilization system - Google Patents

Solar heat utilization system Download PDF

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JP5901920B2
JP5901920B2 JP2011211452A JP2011211452A JP5901920B2 JP 5901920 B2 JP5901920 B2 JP 5901920B2 JP 2011211452 A JP2011211452 A JP 2011211452A JP 2011211452 A JP2011211452 A JP 2011211452A JP 5901920 B2 JP5901920 B2 JP 5901920B2
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hot water
heat
water
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storage tank
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JP2013072589A (en
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誠 寺内
誠 寺内
翼 内山
翼 内山
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株式会社ガスター
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B10/00Integration of renewable energy sources in buildings
    • Y02B10/20Solar thermal
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B10/00Integration of renewable energy sources in buildings
    • Y02B10/70Hybrid systems, e.g. uninterruptible or back-up power supplies integrating renewable energies

Description

本発明は、貯湯タンク内の水を太陽熱で加熱して出湯などに利用する太陽熱利用システムに関する。   The present invention relates to a solar heat utilization system in which water in a hot water storage tank is heated by solar heat and used for hot water.
太陽熱や発電装置などから出る排熱で貯湯タンク内の水を昇温し、給湯や風呂の注湯などに利用するシステムがある。たとえば、燃料電池式の発電装置では、発電に発電装置の冷却が必須なので、発電装置から出る排熱で貯湯タンク内の湯水を昇温することが一般に行われる。   There is a system in which the temperature in the hot water storage tank is raised by exhaust heat from solar heat or power generation equipment, and used for hot water supply or bath pouring. For example, in a fuel cell type power generation device, since cooling of the power generation device is essential for power generation, it is generally performed to raise the temperature of hot water in a hot water storage tank with exhaust heat from the power generation device.
しかし、貯湯タンク内の湯水の温度が高くなると、発電装置の熱が貯湯タンク内の湯水へ移動し難くなり、発電装置の冷却効率が低下して発電を継続できなくなる。そこで、貯湯タンク内の湯が高温の場合に、風呂の自動湯張りが予約されていれば、予約時間の前であっても、貯湯タンク内の湯を使って浴槽へ湯張りすることで、貯湯タンク内へ給水を補充してタンク内の湯水の温度を低下させ、発電装置の冷却を可能にする給湯システムが提案されている(たとえば、特許文献1参照。)。   However, when the temperature of the hot water in the hot water storage tank rises, the heat of the power generation device becomes difficult to move to the hot water in the hot water storage tank, and the cooling efficiency of the power generation device decreases, making it impossible to continue power generation. So, if the hot water in the hot water storage tank is hot and the automatic hot water filling of the bath is reserved, even before the reservation time, the hot water in the hot water storage tank is used to fill the bathtub. There has been proposed a hot water supply system that replenishes hot water in a hot water storage tank to lower the temperature of the hot water in the tank and allows the power generator to be cooled (see, for example, Patent Document 1).
また、貯湯タンクの中部の湯と底部の水とをポンプで混合して中低部の湯水の温度を平均的に低下させ、貯湯タンク上部には熱い湯が溜まるようにしたヒートポンプ給湯機が提案されている(たとえば、特許文献2参照)。   In addition, a heat pump water heater is proposed that mixes the hot water in the middle and hot water of the hot water storage tank with a pump to lower the temperature of the hot water in the middle and low water on average, and hot water is stored in the upper part of the hot water storage tank. (For example, see Patent Document 2).
特開2006−029657号公報JP 2006-029655 A 特開2006−343056号公報JP 2006-343056 A
太陽熱を集熱し、その熱で貯湯タンク内の水を昇温する太陽熱利用システムでは、貯湯タンク内の湯水の温度が上昇すると、集熱装置での太陽熱の熱回収効率が低下し、太陽熱を有効利用できなくなる。   In a solar heat utilization system that collects solar heat and heats the water in the hot water storage tank with that heat, when the temperature of the hot water in the hot water storage tank rises, the heat recovery efficiency of the solar heat in the heat collecting device decreases and the solar heat becomes effective. It becomes unavailable.
また、特許文献1に開示の技術では、風呂の自動湯張りが予約されていなければ対応できない。また、浴槽内に既に設定水位の湯水がある場合には注湯できないので、貯湯タンク内の湯水の温度を下げることはできない。また、一度に設定水位まで注湯するので貯湯タンク内の高温の湯が多量に使用され、湯切れし易くなる。   In addition, the technique disclosed in Patent Literature 1 cannot be used unless automatic bath filling is reserved. Moreover, since hot water cannot be poured when there is already a set water level in the bathtub, the temperature of the hot water in the hot water storage tank cannot be lowered. In addition, since the hot water is poured to the set water level at a time, a large amount of hot water in the hot water storage tank is used, and it becomes easy to run out of hot water.
本発明は、上記の問題を解決しようとするものであり、貯湯タンクにこれ以上蓄熱できなくなって太陽熱の利用効率が低下する事態の発生を抑制することのできる太陽熱利用システムを提供することを目的としている。   The present invention is intended to solve the above-described problem, and an object of the present invention is to provide a solar heat utilization system that can suppress the occurrence of a situation in which the hot water storage tank can no longer store heat and the utilization efficiency of solar heat decreases. It is said.
かかる目的を達成するための本発明の要旨とするところは、次の各項の発明に存する。   The gist of the present invention for achieving the object lies in the inventions of the following items.
[1]入口に給水管が接続され、開閉制御される注湯弁を介して浴槽に通じた管路が出口に接続された貯湯タンクと、
太陽熱を集熱する集熱装置で得た熱で前記貯湯タンク内の水を昇温する加熱装置と、
前記集熱装置で得た熱を回収する集熱運転を制御する制御部と、
を有し、
前記集熱運転は、前記集熱装置で得た熱により前記貯湯タンク内の水を前記加熱装置で昇温する集熱動作と、前記貯湯タンク内の湯水の温度が上がって熱回収効率が低下した場合に前記貯湯タンク内の熱を浴槽の湯水へ移動させる熱退避動作とを有し、
前記制御部は、前記熱退避動作の1つとして、少なくとも前記貯湯タンク内の湯水の温度が所定温度以上であることを条件に、前記注湯弁が開いて前記貯湯タンク内の湯水が前記浴槽へ注湯される第1制御を行う
ことを特徴とする太陽熱利用システム。
[1] A hot water storage tank in which a water supply pipe is connected to the inlet, and a pipe connected to the bathtub via a pouring valve controlled to open and close is connected to the outlet;
A heating device for raising the temperature of the water in the hot water storage tank with heat obtained by a heat collecting device for collecting solar heat;
A control unit for controlling a heat collecting operation for collecting heat obtained by the heat collecting device;
Have
The heat collecting operation includes a heat collecting operation for raising the temperature of the water in the hot water storage tank by the heating device by the heat obtained by the heat collecting device, and the temperature of the hot water in the hot water storage tank is increased, thereby reducing the heat recovery efficiency. A heat evacuation operation to move the heat in the hot water storage tank to the hot water in the bathtub when
As one of the heat evacuation operations, the controller opens the pouring valve so that the hot water in the hot water storage tank is transferred to the bathtub on the condition that the temperature of the hot water in the hot water storage tank is at least a predetermined temperature. A solar heat utilization system characterized by performing a first control to be poured into the water.
上記発明では、貯湯タンク内の湯水の温度が所定温度以上になって、太陽熱の熱回収効率(利用効率)が低下したことを条件に、注湯弁が開いて貯湯タンク内の湯水が浴槽へ注湯される第1制御を行う。該注湯により貯湯タンクの出口から湯水が出ると、その分、入口から給水が補充され、貯湯タンク内の湯水の温度が低下して熱回収効率が回復する。なお、第1制御の実行開始条件としてさらに他の要件、たとえば、風呂の自動湯張りが予約されている、浴槽水位が設定水位以下であるなど、を加えてもよい。   In the above invention, on the condition that the temperature of the hot water in the hot water storage tank becomes equal to or higher than the predetermined temperature and the heat recovery efficiency (utilization efficiency) of solar heat is lowered, the hot water supply valve opens and the hot water in the hot water storage tank is transferred to the bathtub. The first control for pouring is performed. When hot water is discharged from the outlet of the hot water storage tank due to the pouring, the water supply is replenished by that amount, and the temperature of the hot water in the hot water storage tank is lowered to recover the heat recovery efficiency. In addition, you may add other requirements, for example, the automatic hot water filling of the bath is reserved, the bathtub water level is below a setting water level, etc. as execution start conditions of 1st control.
[2]前記入口は前記貯湯タンクの下部に設けられ、
前記出口は前記貯湯タンクの上部に設けられ、
前記加熱装置は、前記貯湯タンクの下部の湯水を加熱し、
前記制御部は、前記貯湯タンクの下部の湯水の温度が前記所定温度以上か否かを判定する
ことを特徴とする[1]に記載の太陽熱利用システム。
[2] The inlet is provided at a lower portion of the hot water storage tank,
The outlet is provided in the upper part of the hot water storage tank,
The heating device heats hot water in the lower part of the hot water storage tank,
The said control part determines whether the temperature of the hot water of the lower part of the said hot water storage tank is more than the said predetermined temperature. The solar-heat utilization system as described in [1] characterized by the above-mentioned.
上記発明では、加熱装置は貯湯タンクの下部の湯水を加熱し、制御部は貯湯タンク下部の水温に基づいて熱回収効率の低下を判断する。また、貯湯タンクの下部から給水され、上部の出口から湯水が出る。この構成において第1制御で注湯すると、貯湯タンク下部に設けられた加熱装置の周囲の水温は低下するが、湯水の出口のある貯湯タンク上部には熱い湯が確保されるので、次の出湯に備えることができる。   In the said invention, a heating apparatus heats the hot water of the lower part of a hot water storage tank, and a control part judges the fall of heat recovery efficiency based on the water temperature of the lower part of a hot water storage tank. Also, water is supplied from the lower part of the hot water storage tank, and hot water comes out from the upper outlet. In this configuration, when hot water is poured in the first control, the water temperature around the heating device provided in the lower part of the hot water storage tank is lowered, but hot water is secured in the upper part of the hot water storage tank where the hot water outlet is located. Can be prepared.
[3]前記制御部は、前記貯湯タンク内の湯水の温度が前記所定温度より低い第2温度に低下したとき、前記第1制御を停止させて、該第1制御による注湯を少量ずつ間欠的に行う
ことを特徴とする[1]または[2]に記載の太陽熱利用システム。
[3] When the temperature of the hot water in the hot water storage tank is lowered to a second temperature lower than the predetermined temperature, the control unit stops the first control and intermittently performs pouring by the first control little by little. solar heating system according to [1] or [2], wherein the performed manner.
上記発明では、貯湯タンク内の湯水の温度が第1温度になると第1制御(注湯)が開始され、第2温度まで下がると第1制御が停止される。すなわち、第1制御による注湯は、少しずつ間欠的に行われる。   In the above invention, the first control (pouring) is started when the temperature of the hot water in the hot water tank reaches the first temperature, and the first control is stopped when the temperature drops to the second temperature. That is, the pouring by the first control is intermittently performed little by little.
[4]一端が前記浴槽に開口された浴槽水取込口に接続され他端が前記浴槽に開口された浴槽水戻し口に接続されかつポンプで浴槽水を循環させることのできる浴槽水循環経路の途中に設けられて、前記貯湯タンク内の湯を熱源として前記浴槽水循環経路内の湯水を加熱する第2加熱装置をさらに有し、
前記制御部は、前記熱退避動作の1つとして、少なくとも前記貯湯タンク内の湯水の温度が所定温度以上であって前記浴槽内の水位が前記浴槽水取込口に達していることを条件に、前記浴槽水循環経路に浴槽水が循環すると共に前記第2加熱装置が作用して前記貯湯タンク内の湯水の熱で前記浴槽水循環経路内の湯水が加熱される第2制御を行う
ことを特徴とする請求項1乃至3のいずれか1項に記載の太陽熱利用システム。
[4] A bathtub water circulation path in which one end is connected to a bathtub water intake opening opened in the bathtub and the other end is connected to a bathtub water return opening opened in the bathtub and the bathtub water can be circulated by a pump. A second heating device that is provided in the middle and heats hot water in the bathtub water circulation path using hot water in the hot water storage tank as a heat source;
The controller, as one of the heat evacuation operations, is provided that at least the temperature of the hot water in the hot water storage tank is equal to or higher than a predetermined temperature, and the water level in the bathtub reaches the bathtub water intake port. And the second water heating device acts to heat the hot water in the hot water storage tank and heat the hot water in the hot water storage tank to perform the second control. The solar heat utilization system according to any one of claims 1 to 3.
上記発明では、少なくとも貯湯タンク内の湯水の温度が所定温度以上であって浴槽の水位が浴槽水取込口に達していることを条件に、貯湯タンク内の湯水を熱源とする第2加熱装置によって浴槽内の湯水を加熱する第2制御を行う。第2制御では、貯湯タンク内の湯水の熱が浴槽水へ移動して貯湯タンク内の湯水の温度が下がる。なお、第2制御の実行開始条件としてさらに他の要件、たとえば、風呂の自動湯張りが予約されている、浴槽水位が設定水位に達している、浴槽水温度が設定温度以下であるなど、を加えてもよい。   In the said invention, the 2nd heating apparatus which uses the hot water in a hot water storage tank as a heat source on the condition that the temperature of the hot water in a hot water storage tank is more than predetermined temperature and the water level of the bathtub has reached the bathtub water intake port The second control for heating the hot and cold water in the bathtub is performed. In the second control, the heat of the hot water in the hot water storage tank moves to the bathtub water, and the temperature of the hot water in the hot water storage tank decreases. In addition, other requirements as the execution start condition of the second control, for example, automatic bath filling is reserved, the bath water level has reached the set water level, the bath water temperature is lower than the set temperature, etc. May be added.
[5]前記制御部は、前記浴槽内の水位が設定水位未満であることを条件に前記第1制御を行い、前記浴槽内の水位が設定水位に達している場合は前記第2制御を行う
ことを特徴とする[4]に記載の太陽熱利用システム。
[5] The control unit performs the first control on the condition that the water level in the bathtub is less than the set water level, and performs the second control when the water level in the bathtub has reached the set water level. The solar-heat utilization system as described in [4] characterized by the above-mentioned.
上記発明では、浴槽の水位が設定水位未満ならば、貯湯タンクの湯水を注湯する第1制御を行い、浴槽の水位が既に設定水位に達しているときは、貯湯タンク内の湯水を熱源とする第2加熱装置によって浴槽内の湯水を加熱する第2制御を行う。   In the above invention, if the water level of the bathtub is lower than the set water level, the first control for pouring hot water in the hot water storage tank is performed, and when the water level of the bathtub has already reached the set water level, the hot water in the hot water tank is used as the heat source. 2nd control which heats the hot water in a bathtub with the 2nd heating device to perform is performed.
[6]前記加熱装置は、前記集熱装置と、前記貯湯タンク内の湯水を加熱するための熱交換器と、前記集熱装置と前記熱交換器との間に形成された熱媒体流体の循環経路と、前記循環経路を通じて前記集熱装置と前記熱交換器との間で熱媒体流体を循環させる循環ポンプとを有し、
前記第2加熱装置は、第1熱交換管が前記循環経路の途中に接続され、前記第1熱交換管と熱交換する第2熱交換管が前記浴槽水循環経路の途中に接続された第2熱交換器を有し、
前記循環経路を、前記集熱装置を通る通常経路と前記集熱装置を迂回する迂回経路に切り替える切替弁を備え、
前記制御部は、前記第2制御において、前記切替弁で前記循環経路を前記迂回経路に設定して前記循環ポンプを全速で作動させ、前記貯湯タンク内の湯水の温度が前記所定温度より低い第2温度に低下したとき前記第2制御を停止する
ことを特徴とする[4]または[5]に記載の太陽熱利用システム。
[6] The heating device includes the heat collecting device, a heat exchanger for heating the hot water in the hot water storage tank, and a heat medium fluid formed between the heat collecting device and the heat exchanger. A circulation path, and a circulation pump for circulating a heat medium fluid between the heat collector and the heat exchanger through the circulation path,
In the second heating device, a first heat exchange pipe is connected in the middle of the circulation path, and a second heat exchange pipe that exchanges heat with the first heat exchange pipe is connected in the middle of the bathtub water circulation path. Have a heat exchanger,
A switching valve for switching the circulation path to a normal path that passes through the heat collector and a bypass path that bypasses the heat collector;
In the second control, the control unit sets the circulation path to the bypass path with the switching valve to operate the circulation pump at full speed, and the temperature of the hot water in the hot water storage tank is lower than the predetermined temperature. The solar heat utilization system according to [4] or [5], wherein the second control is stopped when the temperature falls to two temperatures.
[7]前記貯湯タンクの前記出口には、前記注湯弁を有して前記浴槽への注湯機能を備えた風呂給湯器の給水口に通じる配管が接続され、
前記制御部は、前記第1制御において、前記風呂給湯器に対して加熱なしに注湯動作を行うように指示する
ことを特徴とする[1]乃至[6]のいずれか1項に記載の太陽熱利用システム。
[7] The outlet of the hot water storage tank is connected to a pipe that has the pouring valve and leads to the water inlet of a bath water heater having a function of pouring water into the bathtub,
The controller according to any one of [1] to [6], wherein in the first control, the bath water heater is instructed to perform a pouring operation without heating. Solar heat utilization system.
上記発明では、浴槽への注湯動作が可能な風呂給湯器が後段に接続される。制御部は、第1制御において、該風呂給湯器に対して、加熱せずに浴槽へ注湯するよう指示する。   In the said invention, the bath water heater which can pour into a bathtub is connected to a back | latter stage. In the first control, the control unit instructs the bath water heater to pour hot water into the bathtub without heating.
[8]前記風呂給湯器は、前記ポンプで前記浴槽内の湯水を前記浴槽水循環経路に循環させて前記浴槽の湯水を追い焚きする機能を有し、
前記制御部は、前記第2制御において、前記風呂給湯器に対して加熱なしに前記ポンプを作動させるように指示する
ことを特徴とする[4]乃至[6]のいずれか1項を引用する[7]に記載の太陽熱利用システム。
[8] The bath water heater has a function of circulating hot water in the bathtub with the pump through the bathtub water circulation path to replenish the hot water in the bathtub,
In the second control, the control unit instructs the bath water heater to operate the pump without heating. Citation is given in any one of [4] to [6]. [7] The solar heat utilization system according to [7].
上記発明では、風呂の追い焚き機能を有する風呂給湯器が後段に、接続される。制御部は、第2制御において、該風呂給湯器に対し、加熱せずに追い焚き用のポンプを作動させるように指示する。これにより、第2加熱装置を経由する浴槽水循環経路に浴槽水が循環し、浴槽水が加熱される。   In the said invention, the bath water heater which has the function of reheating a bath is connected to a back | latter stage. In the second control, the control unit instructs the bath water heater to operate the reheating pump without heating. Thereby, bathtub water circulates in the bathtub water circulation path which passes along the 2nd heating device, and bathtub water is heated.
[8]前記風呂給湯器を含むことを特徴とする[7]または[8]に記載の太陽熱利用システム。 [8] The solar heat utilization system according to [7] or [8], including the bath water heater.
本発明に係る太陽熱利用システムによれば、貯湯タンクにこれ以上蓄熱できなくなる事態の発生が抑制され、太陽熱の利用率を高めることができる。   According to the solar heat utilization system which concerns on this invention, generation | occurrence | production of the situation which becomes unable to store heat any more in a hot water storage tank is suppressed, and the utilization factor of solar heat can be raised.
本発明の太陽熱利用システムを含む給湯システムの概略構成を示す説明図である。It is explanatory drawing which shows schematic structure of the hot water supply system containing the solar-heat utilization system of this invention. 風呂給湯器の概略構成を示す説明図である。It is explanatory drawing which shows schematic structure of a bath water heater. 給湯運転における湯水の経路を示す説明図である。It is explanatory drawing which shows the path | route of the hot water in a hot water supply driving | operation. 集熱動作における熱媒体の循環経路を示す説明図である。It is explanatory drawing which shows the circulation path of the heat medium in heat collection operation | movement. 第1熱退避動作における湯水の経路を示す説明図である。It is explanatory drawing which shows the path | route of the hot water in 1st heat evacuation operation | movement. 第2熱退避動作における湯水および熱媒体の循環経路を示す説明図である。It is explanatory drawing which shows the circulation path | route of the hot water and heat medium in 2nd heat evacuation operation | movement. 集熱運転中の制御を示す流れ図である。It is a flowchart which shows the control in heat collection driving | operation. 集熱動作と第2熱退避動作とを並行に行う場合の熱媒体および浴槽水の経路を示す説明図である。It is explanatory drawing which shows the path | route of the heat medium and bathtub water in the case of performing heat collecting operation | movement and 2nd heat evacuation operation | movement in parallel.
以下、図面に基づき本発明の実施の形態を説明する。   Hereinafter, embodiments of the present invention will be described with reference to the drawings.
図1は、本発明の太陽熱利用システム(以下、貯湯システムとする)を含む給湯システム10の構成を示している。給湯システム10は、貯湯システム11と、風呂給湯器12とを有する。   FIG. 1 shows a configuration of a hot water supply system 10 including a solar heat utilization system (hereinafter referred to as a hot water storage system) of the present invention. The hot water supply system 10 includes a hot water storage system 11 and a bath water heater 12.
貯湯システム11は、太陽光を利用して加熱した湯を蓄える貯湯タンク14を備えており、該貯湯タンク14からの湯水に給水を混合したものを風呂給湯器12の給水口へ供給する。風呂給湯器12は、貯湯システム11から供給される湯水を必要に応じて設定温度に加熱して給湯配管13へ出湯する機能を果たす。貯湯システム11は、太陽光を利用して加熱した湯を優先的に利用することで風呂給湯器12による加熱(以下、「追い加熱」とする。)を少なく抑えて、省エネルギでの給湯を可能にする。   The hot water storage system 11 includes a hot water storage tank 14 for storing hot water heated using sunlight, and supplies hot water from the hot water storage tank 14 to the water supply port of the bath water heater 12. The bath water heater 12 fulfills the function of heating the hot water supplied from the hot water storage system 11 to a set temperature as needed and discharging the hot water to the hot water supply pipe 13. The hot water storage system 11 preferentially uses hot water heated using sunlight to suppress heating by the bath water heater 12 (hereinafter referred to as “follow-up heating”), and to supply hot water with energy saving. to enable.
貯湯システム11の詳細構成を説明する。貯湯タンク14は、中空略円柱状のタンクであり、底部と天井部のそれぞれに配管接続口が設けてある。底部の配管接続口(入口)には給水管15の終端が接続されている。天井部の配管接続口(出口)には接続配管16の一端が接続され、この接続配管16の他端は風呂給湯器12の給水口に接続されている。   A detailed configuration of the hot water storage system 11 will be described. The hot water storage tank 14 is a hollow, substantially cylindrical tank, and has piping connection ports at the bottom and the ceiling. A terminal end of the water supply pipe 15 is connected to the bottom pipe connection port (inlet). One end of the connection pipe 16 is connected to the pipe connection port (exit) of the ceiling, and the other end of the connection pipe 16 is connected to the water supply port of the bath water heater 12.
接続配管16の途中には、貯湯タンク14からの湯と給水とを混合する混合弁17が設けてある。ここでは、混合弁17は、第1バルブ17aと第2バルブ17bの2つで構成される。第1バルブ17aは接続配管16に介挿されている。第2バルブ17bは、給水管15の途中から分岐して第1バルブ17aの風呂給湯器12側で接続配管16に合流する分岐給水管15aの途中に介挿されている。第1バルブ17aと第2バルブ17bは開度(通水量)をそれぞれ0%から100%まで調整可能な水量調整弁である。第1バルブ17aと第2バルブ17bの開度により、貯湯タンク14からの湯と給水との混合比が調整される。   A mixing valve 17 that mixes hot water and hot water from the hot water storage tank 14 is provided in the middle of the connection pipe 16. Here, the mixing valve 17 includes two valves, a first valve 17a and a second valve 17b. The first valve 17 a is inserted in the connection pipe 16. The second valve 17b is inserted in the middle of the branch water supply pipe 15a which branches from the middle of the water supply pipe 15 and merges with the connection pipe 16 on the bath water heater 12 side of the first valve 17a. The first valve 17a and the second valve 17b are water amount adjusting valves whose opening degrees (water flow amount) can be adjusted from 0% to 100%, respectively. The mixing ratio of hot water and hot water from the hot water storage tank 14 is adjusted by the opening degree of the first valve 17a and the second valve 17b.
貯湯タンク14は、たとえば、容量100リットルを有し、底から20リットルの水位の箇所に、その箇所の水温を検出する第1温度センサ41が、底から40リットルの水位の箇所に、その箇所の水温を検出する第2温度センサ42が、底から60リットルの水位の箇所に、その箇所の水温を検出する第3温度センサ43が、底から80リットルの水位の箇所に、その箇所の水温を検出する第4温度センサ44がそれぞれ設けてある。   The hot water storage tank 14 has, for example, a capacity of 100 liters, and a first temperature sensor 41 for detecting the water temperature at a water level of 20 liters from the bottom is located at a water level of 40 liters from the bottom. The second temperature sensor 42 for detecting the water temperature of the water is located at a location where the water level is 60 liters from the bottom, and the third temperature sensor 43 for detecting the water temperature at that location is located at the location where the water level is 80 liters from the bottom. A fourth temperature sensor 44 for detecting the above is provided.
また、貯湯タンク14の天井部の配管接続口の近傍の接続配管16には、貯湯タンク14から出てくる湯水の温度を検出するタンク出湯温度センサ46が設けてある。給水管15の途中には給水温度を検出する給水温度センサ47が設けてある。さらに混合弁17の出側(風呂給湯器12側)の接続配管16には、水量センサ48が、さらにその下流側(風呂給湯器12側)には、混合弁17で混合後の湯水の温度を検出する混合温度センサ49が設けてある。   In addition, the connection piping 16 in the vicinity of the piping connection port on the ceiling of the hot water storage tank 14 is provided with a tank hot water temperature sensor 46 that detects the temperature of the hot water coming out of the hot water storage tank 14. A water supply temperature sensor 47 for detecting the water supply temperature is provided in the middle of the water supply pipe 15. Further, a water amount sensor 48 is connected to the connecting pipe 16 on the outlet side (bath water heater 12 side) of the mixing valve 17, and the temperature of hot water after mixing by the mixing valve 17 is further downstream (bath water heater 12 side). A mixed temperature sensor 49 is provided to detect the above.
貯湯タンク14内の下部には、熱媒体循環経路22の一部をなす熱交換用配管18が挿通されている。熱媒体循環経路22は、この熱交換用配管18と、シスターン19と、水-水熱交換器20と、太陽熱の集熱装置21とを経由して熱媒体(ここでは、水)を循環させる経路である。   A heat exchange pipe 18 that forms part of the heat medium circulation path 22 is inserted through the lower part of the hot water storage tank 14. The heat medium circulation path 22 circulates the heat medium (here, water) via the heat exchange pipe 18, the cistern 19, the water-water heat exchanger 20, and the solar heat collecting device 21. It is a route.
詳細には、熱媒体循環経路22は、熱交換用配管18の出側からシスターン19の入り側へ至る第1熱媒配管22aと、シスターン19の出側から水-水熱交換器20の入り側に至る第2熱媒配管22bと、水-水熱交換器20の出側から集熱装置21の入り側に至る第3熱媒配管22cと、集熱装置21の出側から熱交換用配管18の入り側へ至る第4熱媒配管22dとからなる。図中、集熱装置21は、貯湯システム11の構成要素であるが、外付け機器としてもよい。   Specifically, the heat medium circulation path 22 includes the first heat medium pipe 22 a extending from the outlet side of the heat exchange pipe 18 to the inlet side of the cistern 19 and the inlet of the water-water heat exchanger 20 from the outlet side of the cistern 19. The second heat medium pipe 22b extending to the side, the third heat medium pipe 22c extending from the outlet side of the water-water heat exchanger 20 to the inlet side of the heat collector 21, and for heat exchange from the outlet side of the heat collector 21. It consists of a fourth heat medium pipe 22d that reaches the entry side of the pipe 18. In the figure, the heat collecting device 21 is a component of the hot water storage system 11, but may be an external device.
シスターン19は、熱媒体循環経路22を循環する熱媒体を蓄えるためのタンクである。また、シスターン19は大気圧に開放されたタンクであり、熱媒体循環経路22に混入した空気を抜くと共に、熱媒体の膨張・収縮による体積変動を吸収する。熱媒体の流出口はシスターン19の底部にあり、熱交換用配管18からの熱媒体の流入口は、流出口よりある程度上方に設けてある。大気開放用の開口19bは、シスターン19の上部(想定する最高水位より上)に設けてあり、この大気開放用の開口19bの外側には下方へ延びて終端が開放されたチューブ19cが接続されている。また、シスターン19は内部の水位を検出する水位センサ19aを備えている。本例の水位センサ19aは低水位検出用電極、高水位検出用電極および共通電極で構成される。   The cistern 19 is a tank for storing a heat medium circulating in the heat medium circulation path 22. In addition, the cistern 19 is a tank that is open to atmospheric pressure, and removes air mixed in the heat medium circulation path 22 and absorbs volume fluctuation due to expansion and contraction of the heat medium. The heat medium outlet is located at the bottom of the cistern 19, and the heat medium inlet from the heat exchange pipe 18 is provided to some extent above the outlet. The opening 19b for opening to the atmosphere is provided in the upper part (above the assumed maximum water level) of the cis turn 19, and a tube 19c extending downward and having an open end is connected to the outside of the opening 19b for opening to the atmosphere. ing. In addition, the cistern 19 includes a water level sensor 19a that detects an internal water level. The water level sensor 19a of this example includes a low water level detection electrode, a high water level detection electrode, and a common electrode.
水-水熱交換器20は2つの管路を所定の長さに渡って密に接触させたものであり、高温側の管路から低温側の管路へ熱を移動させる役割を果たす。水-水熱交換器20の一方の管路(図中は内側管路(第1熱交換管)20a)は、熱媒体循環経路22の途中に介挿されて接続されている。   The water-water heat exchanger 20 has two pipes in close contact with each other over a predetermined length, and plays a role of transferring heat from a high temperature side pipe to a low temperature side pipe. One pipe line (in the drawing, an inner pipe line (first heat exchange pipe) 20a) of the water-water heat exchanger 20 is inserted and connected in the middle of the heat medium circulation path 22.
水-水熱交換器20の内側管路20aの出側から集熱装置21の入り側に至る第3熱媒配管22cの途中には、循環ポンプ24が設けてある。循環ポンプ24は、第3熱媒配管22c内の熱媒体を集熱装置21側へ送出する。この循環ポンプ24の下流側の第3熱媒配管22cには、切替弁25が介挿されている。切替弁25の第1接続口25aには、循環ポンプ24側からの第3熱媒配管22cが接続され、切替弁25の第2接続口25bには集熱装置21側へ至る第3熱媒配管22cが接続されている。切替弁25の第3接続口25cには連結管26の一端が接続されており、連結管26の他端は、集熱装置21から熱交換用配管18の入り側へ至る第4熱媒配管22dの途中に合流して接続されている。   A circulation pump 24 is provided in the middle of the third heat medium pipe 22 c from the outlet side of the inner pipe 20 a of the water-water heat exchanger 20 to the inlet side of the heat collector 21. The circulation pump 24 sends the heat medium in the third heat medium pipe 22c to the heat collector 21 side. A switching valve 25 is inserted in the third heat medium pipe 22 c on the downstream side of the circulation pump 24. A third heat medium pipe 22c from the circulation pump 24 side is connected to the first connection port 25a of the switching valve 25, and a third heat medium reaching the heat collector 21 side is connected to the second connection port 25b of the switching valve 25. A pipe 22c is connected. One end of a connection pipe 26 is connected to the third connection port 25c of the switching valve 25, and the other end of the connection pipe 26 is a fourth heat medium pipe extending from the heat collecting device 21 to the entrance side of the heat exchange pipe 18. 22d is joined and connected in the middle.
切替弁25は、第1接続口25aと第2接続口25bとを連通させ第3接続口25cを閉鎖した第1状態と、第1接続口25aと第3接続口25cとを連通させ第2接続口25bを閉鎖した第2状態とに切り替わる。   The switching valve 25 allows the first connection port 25a and the second connection port 25b to communicate with each other and the third connection port 25c to close, and the first connection port 25a and the third connection port 25c to communicate with each other. It switches to the 2nd state which closed connection port 25b.
貯湯タンク14など貯湯システム11の本体は地上に設置され、集熱装置21は貯湯システム11の本体より上方の屋根上などに設置される。第3熱媒配管22cのうち貯湯システム11の本体側の接続部27aから集熱装置21へ向かう部分の連絡配管および集熱装置21から貯湯システム11の本体側の接続部27bへ戻る部分の連絡配管には架橋ポリエチレン管を使用している。架橋ポリエチレン管の耐熱温度は、水圧、設定耐用年数によるが、90℃〜95℃である。   The main body of the hot water storage system 11 such as the hot water storage tank 14 is installed on the ground, and the heat collecting device 21 is installed on the roof above the main body of the hot water storage system 11. Of the third heat medium pipe 22c, a connecting pipe of a part from the main body side connection part 27a of the hot water storage system 11 to the heat collecting device 21 and a part of the third heat medium pipe 22c returning to the main body side connecting part 27b of the hot water storage system 11 are connected. Cross-linked polyethylene pipes are used for the piping. The heat resistance temperature of the cross-linked polyethylene pipe is 90 ° C. to 95 ° C. depending on the water pressure and the set service life.
集熱装置21には、集熱装置21内の湯水の温度を検出する高温センサ51が設けてある。また、連結管26の合流接続箇所より熱交換用配管18側の第4熱媒配管22dの途中には、その箇所を通る熱媒体の温度を検出する熱媒温度センサ52が設けてある。   The heat collector 21 is provided with a high temperature sensor 51 that detects the temperature of hot water in the heat collector 21. Further, a heat medium temperature sensor 52 for detecting the temperature of the heat medium passing through the fourth heat medium pipe 22d on the heat exchanging pipe 18 side is provided in the middle of the joint connection place of the connecting pipe 26.
風呂給湯器12は、給水口に接続された接続配管16を通じて貯湯システム11から供給される湯水を設定温度に加熱して給湯配管13へ出湯するほか、給水口から供給される湯水を風呂の設定温度等に加熱して浴槽3へ注湯する湯張り機能(注湯機能)および、浴槽3内の湯水を追い焚きする追い焚き機能を備えている。   The bath water heater 12 heats the hot water supplied from the hot water storage system 11 through a connection pipe 16 connected to the water supply port to a set temperature and discharges the hot water to the hot water supply pipe 13, and sets the hot water supplied from the water supply port to the bath. It has a hot water filling function (hot water pouring function) for pouring hot water into the bathtub 3 by heating to a temperature and the like, and a reheating function for chasing hot water in the bathtub 3.
追い焚き時に湯水を循環させる追い焚き循環経路は、浴槽3から湯水を風呂給湯器12へ取り込むための風呂戻り管32と、風呂給湯器12内の熱交換器を通る配管と、熱交換器を経て昇温された湯水を浴槽3へ送り出す風呂往き管31などで構成される。風呂往き管31は、途中で水-水熱交換器20の他方の管路(外側管路(第2熱交換管)20b)を経由して浴槽3へ至る。   The recirculation circulation path for circulating hot water during reheating includes a bath return pipe 32 for taking hot water from the bathtub 3 into the bath water heater 12, a pipe passing through the heat exchanger in the bath water heater 12, and a heat exchanger. The hot water heated after that is composed of a bath outlet pipe 31 that sends out hot water to the bathtub 3. The bath outlet pipe 31 reaches the bathtub 3 through the other pipe line (outer pipe line (second heat exchange pipe) 20b) of the water-water heat exchanger 20 on the way.
風呂給湯器12と水-水熱交換器20との間には、浴槽3から取り込んだ湯水の温度を検出するための風呂温度センサ53が設けてある。   A bath temperature sensor 53 for detecting the temperature of hot water taken from the bathtub 3 is provided between the bath water heater 12 and the water-water heat exchanger 20.
このほか、タンク出湯温度センサ46と混合弁17(第1バルブ17a)との間の接続配管16には、接続配管16の閉鎖・開通を切り替える出湯禁止電磁弁54が設けてある。また、出湯禁止電磁弁54とタンク出湯温度センサ46との間で接続配管16から分岐した2つの分岐配管が設けてあり、その一方の先端には排水電磁弁55が、他方の分岐配管の先端には圧力逃がし弁56が設けてある。また、給水管15には、水フィルタ、減圧弁、逆止弁などが介挿されている。   In addition, the connecting pipe 16 between the tank hot water temperature sensor 46 and the mixing valve 17 (first valve 17a) is provided with a hot water prohibiting electromagnetic valve 54 for switching between closing and opening of the connecting pipe 16. Further, two branch pipes branched from the connection pipe 16 are provided between the hot water prohibition solenoid valve 54 and the tank hot water temperature sensor 46, and a drain electromagnetic valve 55 is provided at one end of the branch pipe and the other branch pipe is provided. Is provided with a pressure relief valve 56. Further, a water filter, a pressure reducing valve, a check valve and the like are inserted in the water supply pipe 15.
貯湯システム11は、当該貯湯システム11の動作を統括制御する制御ユニット60を備えている。制御ユニット60は、CPU(Central Processing Unit)と、該CPUが実行するプログラムや固定データなどが記憶されたフラッシュROM(Read Only Memory)と、CPUがプログラムを実行する際に各種情報を一時記憶するRAM(Random Access Memory)、各種の信号を入出力するI/F部などを主要部とする回路で構成されている。制御ユニット60には、貯湯システム11の各種センサからの検出信号が入力されている。また制御ユニット60から各弁、循環ポンプ24などの制御対象へ制御信号が出力される。   The hot water storage system 11 includes a control unit 60 that performs overall control of the operation of the hot water storage system 11. The control unit 60 temporarily stores a CPU (Central Processing Unit), a flash ROM (Read Only Memory) in which programs executed by the CPU, fixed data, and the like are stored, and various information when the CPU executes the programs. A RAM (Random Access Memory), an I / F unit for inputting / outputting various signals, and the like are configured as circuits. Detection signals from various sensors of the hot water storage system 11 are input to the control unit 60. In addition, a control signal is output from the control unit 60 to the control target such as each valve and the circulation pump 24.
貯湯システム11の制御ユニット60は、貯湯システム11と風呂給湯器12との共通のリモコン(以下、共通リモコンとする)から必要な情報の授受を行い、風呂給湯器12の制御基盤70も共通リモコンから必要な情報の授受を行う。ここでは、制御ユニット60は、共通リモコンで設定されている設定温度の情報や、風呂給湯器12に追い焚き動作を指示しているか否かを示す情報などを共通リモコンから取得する。また、燃焼禁止・許可を指示する信号、バーナ73を燃焼させずに風呂循環ポンプ85(図2参照)を駆動させる信号(風呂ポンプ駆動信号)を制御ユニット60から共通リモコンに、風呂給湯器12のメンテナンス時に用いる信号等を用いて送信する。これらの信号が示す情報を風呂給湯器12の制御基盤70は上述の共通リモコンから受信する。   The control unit 60 of the hot water storage system 11 transmits and receives necessary information from a common remote controller (hereinafter referred to as a common remote controller) for the hot water storage system 11 and the bath water heater 12, and the control base 70 of the bath water heater 12 is also a common remote controller. Send and receive necessary information. Here, the control unit 60 acquires information on the set temperature set by the common remote controller, information indicating whether or not the bath water heater 12 is instructed to perform a reheating operation, and the like from the common remote controller. In addition, a signal for instructing combustion prohibition / permission and a signal for driving the bath circulation pump 85 (see FIG. 2) without burning the burner 73 (bath pump drive signal) are sent from the control unit 60 to the common remote controller 12. It transmits using the signal etc. which are used at the time of maintenance. The control board 70 of the bath water heater 12 receives information indicated by these signals from the above-described common remote controller.
図2は、風呂給湯器12の概略構成を示している。風呂給湯器12は、入り側に入水管71が出側に給湯配管13がそれぞれ接続された給湯用水管72aと、出側に風呂往き管31が入り側に風呂戻り管32がそれぞれ接続された追い焚き用水管72bとを備えた一缶二水路型の熱交換器72を備えている。入水管71の始端は貯湯システム11側からの接続配管16が接続される給水口となっている。   FIG. 2 shows a schematic configuration of the bath water heater 12. The bath water heater 12 includes a hot water supply water pipe 72a in which a water inlet pipe 71 is connected to the outlet side and a hot water supply pipe 13 to the outlet side, and a bath outlet pipe 31 on the outlet side, and a bath return pipe 32 to the inlet side. A can-two-water channel heat exchanger 72 provided with a reheating water pipe 72b is provided. The starting end of the water intake pipe 71 is a water supply port to which the connection pipe 16 from the hot water storage system 11 side is connected.
熱交換器72は下方に配置されたバーナ73からの熱を受熱するための多数のフィン72cを備えている。バーナ73にはガス供給管74が接続されている。ガス供給管74の途中には、ガスの供給/遮断を切り替えるガス弁75や供給ガス量を調整する比例弁76などが設けてある。   The heat exchanger 72 includes a large number of fins 72c for receiving heat from the burner 73 disposed below. A gas supply pipe 74 is connected to the burner 73. In the middle of the gas supply pipe 74, a gas valve 75 for switching supply / cutoff of gas, a proportional valve 76 for adjusting the amount of supply gas, and the like are provided.
給湯配管13と風呂戻り管32とは、連結管77によって接続されており、該連結管77の途中には、連結管77の閉鎖/開通を切り替える注湯電磁弁78が設けてある。また、連結管77の接続箇所より上流側の給湯配管13の途中には、閉鎖状態から全開状態まで開度を調整可能な水量サーボ79が出湯水量を調整するために設けてある。水量サーボ79の下流側には、出湯温度を検出する出湯温度センサ80が設けてある。   The hot water supply pipe 13 and the bath return pipe 32 are connected by a connecting pipe 77, and a pouring electromagnetic valve 78 that switches between closing and opening of the connecting pipe 77 is provided in the middle of the connecting pipe 77. Further, in the middle of the hot water supply pipe 13 upstream from the connection point of the connecting pipe 77, a water amount servo 79 capable of adjusting the opening degree from the closed state to the fully opened state is provided in order to adjust the amount of discharged hot water. A tapping temperature sensor 80 for detecting tapping temperature is provided on the downstream side of the water amount servo 79.
さらに、入水管71から分岐し、水量サーボ79より給湯用水管72a側の所定箇所で給湯配管13に合流・接続されたバイパス管81を備え、このバイパス管81の途中に、閉鎖から全開まで開度を調整可能なバイパス調整弁82を備えている。このバイパス管81とバイパス調整弁82により、給湯用水管72aで設定温度より高い温度の湯が作られても入水管71より送り込まれた水と交ぜて設定温度の湯を作り出すようになっている。このために、給湯用水管72a出口温度を測定する給湯水管出口温度センサ91が設けられている。   Furthermore, a bypass pipe 81 branched from the water inlet pipe 71 and joined to and connected to the hot water supply pipe 13 at a predetermined location on the hot water supply water pipe 72a side from the water quantity servo 79 is provided. A bypass adjustment valve 82 capable of adjusting the degree is provided. By the bypass pipe 81 and the bypass adjustment valve 82, even if hot water having a temperature higher than the set temperature is produced in the hot water supply water pipe 72a, the hot water having the set temperature is produced by mixing with the water fed from the water inlet pipe 71. . For this purpose, a hot water supply pipe outlet temperature sensor 91 for measuring the hot water supply pipe 72a outlet temperature is provided.
そして、給湯水管出口温度センサ91と後述の入水温度を参照しながら共通リモコンに設定された出湯温度と出湯温度センサ80の測定値とが一致するようにバイパス調整弁82が調整される。また、バイパス管81の分岐箇所より上流側の入水管71には、入水管71内の水の流量を検出する流量センサ83および入水温度を検知する入水温度センサ84が設けてある。なお演算で入水温度を推定するようにした器具にあっては入水温度センサ84を設けない場合もある。   Then, the bypass adjustment valve 82 is adjusted so that the hot water temperature set in the common remote controller matches the measured value of the hot water temperature sensor 80 while referring to the hot water supply pipe outlet temperature sensor 91 and the incoming water temperature described later. In addition, the inlet pipe 71 upstream of the branch point of the bypass pipe 81 is provided with a flow rate sensor 83 that detects the flow rate of water in the inlet pipe 71 and an incoming water temperature sensor 84 that detects the incoming water temperature. In addition, in the instrument which estimated the incoming water temperature by calculation, the incoming water temperature sensor 84 may not be provided.
風呂戻り管32の途中には、浴槽3内の湯水を、追い焚き循環経路(風呂戻り管32、追い焚き用水管72b、風呂往き管31)を通じて循環させるための風呂循環ポンプ85が設けてある。風呂戻り管32に設けた流水スイッチ86は、風呂循環ポンプ85を作動させたとき、追い焚き循環経路に実際に水が循環しているか否かを検出する。   In the middle of the bath return pipe 32, there is provided a bath circulation pump 85 for circulating hot water in the bathtub 3 through the recirculation circulation path (bath return pipe 32, reheating water pipe 72b, bath return pipe 31). . A flowing water switch 86 provided in the bath return pipe 32 detects whether water is actually circulating in the recirculation path when the bath circulation pump 85 is operated.
このほか、風呂往き管31および風呂戻り管32には、それぞれ管内の温度を検出する風呂往き温度センサ87、風呂戻り温度センサ88が設けてある。   In addition, a bath-out temperature sensor 87 and a bath-return temperature sensor 88 are provided in the bath-out tube 31 and the bath-return tube 32, respectively.
制御基盤70は、CPUと、該CPUが実行するプログラムや固定データなどが記憶されたフラッシュROMと、CPUがプログラムを実行する際に各種情報を一時記憶するRAMなどを主要部とする回路で構成されている。制御基盤70には、風呂給湯器12が有する各種センサ、弁、風呂循環ポンプ85などが接続されている。   The control board 70 includes a CPU, a flash ROM that stores programs executed by the CPU, fixed data, and the like, and a RAM that temporarily stores various types of information when the CPU executes programs. Has been. Various sensors, valves, bath circulation pumps 85 and the like that the bath water heater 12 has are connected to the control board 70.
さらに、制御基盤70には、配線を介して操作パネル(共通リモコン)89が接続されている。操作パネル89は、給湯の設定温度や風呂の設定温度の指定、湯張り動作や追い焚き動作の開始・終了指示、電源のオン/オフなど各種の操作をユーザから受けるスイッチ類、および動作状態や設定温度などを表示する表示部などで構成される。また、操作パネル89は時間を計時する時計部89aを備えている。時計部89aが計時する時刻は、操作パネル89の表示部に表示される。また、時計部89aが計時する時刻情報は貯湯システム11の制御ユニット60へ通知される。   Furthermore, an operation panel (common remote controller) 89 is connected to the control board 70 via wiring. The operation panel 89 includes a switch for receiving various operations from the user, such as designation of a set temperature for hot water supply and a set temperature for a bath, start / end instructions for hot water filling and reheating, and power on / off, It consists of a display unit that displays the set temperature. The operation panel 89 also includes a clock unit 89a that measures time. The time counted by the clock unit 89a is displayed on the display unit of the operation panel 89. Further, the time information counted by the clock unit 89a is notified to the control unit 60 of the hot water storage system 11.
風呂給湯器12の制御基盤70は、給湯配管13から出湯する給湯動作では、操作パネル89でユーザが設定した給湯設定温度の湯が出湯されるようにバーナ73の燃焼量やバイパス調整弁82の開度などを制御する。   The control base 70 of the bath water heater 12 is configured so that the amount of combustion of the burner 73 and the bypass adjustment valve 82 are adjusted so that hot water at the hot water supply set temperature set by the user on the operation panel 89 is discharged in the hot water supply operation. Control the opening.
浴槽3へ注湯する湯張り動作では、制御基盤70は、バーナ73を燃焼させた状態で注湯電磁弁78および水量サーボ79を開くことにより、熱交換器72の給湯用水管72aを通じて加熱した湯を、給湯配管13から連結管77へ送り出し、風呂戻り管32および風呂往き管31の双方を通じて浴槽3へ流し込む。この際、制御基盤70は、操作パネル89でユーザが設定した風呂設定温度の湯が注湯されるようにバーナ73の燃焼量やバイパス調整弁82の開度などを制御する。さらに浴槽3内の水位が設定水位に達すると注湯動作を停止して、追い焚き動作を行う。   In the hot water filling operation for pouring water into the bathtub 3, the control base 70 is heated through the hot water supply water pipe 72 a of the heat exchanger 72 by opening the hot water solenoid valve 78 and the water amount servo 79 with the burner 73 burned. Hot water is sent from the hot water supply pipe 13 to the connecting pipe 77 and flows into the bathtub 3 through both the bath return pipe 32 and the bath outlet pipe 31. At this time, the control board 70 controls the combustion amount of the burner 73, the opening degree of the bypass adjustment valve 82, and the like so that hot water having a bath set temperature set by the user on the operation panel 89 is poured. Further, when the water level in the bathtub 3 reaches the set water level, the pouring operation is stopped and the reheating operation is performed.
追い焚き動作では、注湯電磁弁78を閉鎖し、風呂循環ポンプ85を作動させた状態でバーナ73を燃焼させる。これにより浴槽3内の湯水が風呂戻り管32を通じて風呂給湯器12内に取り込まれて加熱され、過熱後の湯水が風呂往き管31を通じて浴槽3へ送り出される。   In the reheating operation, the pouring electromagnetic valve 78 is closed, and the burner 73 is burned with the bath circulation pump 85 activated. Thereby, the hot water in the bathtub 3 is taken into the bath water heater 12 through the bath return pipe 32 and heated, and the hot water after overheating is sent out to the bathtub 3 through the bath going pipe 31.
なお、風呂給湯器12は、貯湯システム11からの指示により、バーナ73を燃焼させずに注湯動作(燃焼なしの注湯動作)を行うことができる。また、貯湯システム11からの指示により、バーナ73を燃焼させずに風呂循環ポンプ85を作動させる動作(燃焼なしの追い焚き動作)も実行可能に構成されている。   The bath water heater 12 can perform a pouring operation (a pouring operation without combustion) without burning the burner 73 in accordance with an instruction from the hot water storage system 11. In addition, an operation for operating the bath circulation pump 85 without burning the burner 73 (a reheating operation without combustion) can be executed in accordance with an instruction from the hot water storage system 11.
風呂給湯器12のバーナ73は所定の最低加熱量(最低号数)以下では燃焼させることができない。そのため、風呂給湯器12の制御基盤70は、設定温度の湯を出すために必要な加熱量が最低加熱量より少ない場合は、バーナ73を燃焼オフしたままの状態に制御する。必要な加熱量は、設定温度と入水温度センサ84で検出される入水温度との温度差、流量センサ83で検出される流量、熱効率などに基づいて算出する。   The burner 73 of the bath water heater 12 cannot be burned below a predetermined minimum heating amount (minimum number). Therefore, the control base 70 of the bath water heater 12 controls the burner 73 to be in a state where the burner 73 is burned off when the heating amount necessary for discharging hot water at the set temperature is smaller than the minimum heating amount. The necessary amount of heating is calculated based on the temperature difference between the set temperature and the incoming water temperature detected by the incoming water temperature sensor 84, the flow rate detected by the flow sensor 83, the thermal efficiency, and the like.
次に、貯湯システム11の各種動作について説明する。   Next, various operations of the hot water storage system 11 will be described.
<給湯運転>
図3は、給湯運転の概略動作を示している。図3では、給湯運転において湯水が流れる経路を太線で示してある。また各部において湯水が流れる方向を矢印で示してある。給湯運転では、貯湯タンク14からの湯水と分岐給水管15aからの給水とが混合弁17で混合されて風呂給湯器12の給水口(入水管71)へ供給される。風呂給湯器12は供給された水を必要に応じて加熱して給湯配管13へ出湯する。
<Hot water supply operation>
FIG. 3 shows a schematic operation of the hot water supply operation. In FIG. 3, the path through which hot water flows in the hot water supply operation is indicated by a thick line. The direction in which hot water flows in each part is indicated by arrows. In the hot water supply operation, the hot water from the hot water storage tank 14 and the water supplied from the branch water supply pipe 15a are mixed by the mixing valve 17 and supplied to the water supply port (water intake pipe 71) of the bath water heater 12. The bath water heater 12 heats the supplied water as needed and discharges it to the hot water supply pipe 13.
すなわち、貯湯タンク14に設定温度より第1温度(途中の温度低下分を考慮したマージン温度、たとえば、2℃)以上高い温度の湯水が所定量以上存在する場合(湯有り)は、設定温度+第1温度の湯水が混合弁17の出側から風呂給湯器12へ送り出されるように混合弁17の混合比を制御する。この場合、風呂給湯器12は自装置での燃焼は不要と判断し、貯湯システム11側から供給された湯水を加熱せずに給湯配管13へ出湯する。たとえば、貯湯タンク14に設けた第3温度センサ43が(設定温度+所定温度)以上の温度を検出している場合に上記動作を行う。   That is, when there is a predetermined amount or more of hot water having a temperature higher than the set temperature by a first temperature (margin temperature considering the temperature drop in the middle, for example, 2 ° C.) or more than the set temperature (with hot water), the set temperature + The mixing ratio of the mixing valve 17 is controlled so that hot water at the first temperature is sent from the outlet side of the mixing valve 17 to the bath water heater 12. In this case, the bath water heater 12 determines that combustion in the own apparatus is unnecessary, and hot water supplied from the hot water storage system 11 side is discharged to the hot water supply pipe 13 without heating. For example, the above operation is performed when the third temperature sensor 43 provided in the hot water storage tank 14 detects a temperature equal to or higher than (set temperature + predetermined temperature).
一方、貯湯タンク14に設定温度より第1温度(途中の温度低下分を考慮したマージン温度)以上高い温度の湯水が所定量以上存在しない場合(湯切れ)は、風呂給湯器12での追い加熱が行われて設定温度の湯が出湯されるように、設定温度より第2温度以上低い温度の湯水が混合弁17の出側から風呂給湯器12へ送り出されるように混合弁17の混合比を制御する。設定温度−第2温度以下の温度の湯水が供給された場合、風呂給湯器12は必ずバーナ73を燃焼させる。   On the other hand, if hot water having a temperature higher than the preset temperature by a first temperature (margin temperature considering the temperature drop in the middle) or more than a predetermined amount does not exist in the hot water storage tank 14 (hot water shortage), follow-up heating in the bath water heater 12 The mixing ratio of the mixing valve 17 is adjusted so that hot water having a temperature lower than the second temperature by a second temperature or more is sent from the outlet side of the mixing valve 17 to the bath water heater 12 so that hot water having a set temperature is discharged. Control. When hot water having a temperature equal to or lower than the set temperature-second temperature is supplied, the bath water heater 12 always burns the burner 73.
たとえば、貯湯タンク14内の湯水の温度が設定温度より第2温度以上低い場合は、混合弁17で分岐給水管15aからの給水を混ぜずに貯湯タンク14内の湯水をそのまま風呂給湯器12へ送る。貯湯タンク14内の湯水が設定温度+第2温度より高いが、設定温度+第1温度より低い場合には、貯湯タンク14からの湯水に分岐給水管15aからの給水を混合弁17で混合し、設定温度−第2温度以下まで温度を下げた湯水を風呂給湯器12へ送る。これより、風呂給湯器12で追い加熱が行われる。また、追い加熱が行われても出湯温度が設定温度を超えることはない。   For example, when the temperature of the hot water in the hot water storage tank 14 is lower than the set temperature by a second temperature or more, the hot water in the hot water storage tank 14 is directly supplied to the bath water heater 12 without mixing the water supplied from the branch water supply pipe 15a by the mixing valve 17. send. When the hot water in the hot water storage tank 14 is higher than the set temperature + second temperature but lower than the set temperature + first temperature, the hot water from the hot water storage tank 14 is mixed with hot water from the branch water supply pipe 15a by the mixing valve 17. The hot water whose temperature has been lowered to the preset temperature minus the second temperature is sent to the bath water heater 12. Thus, additional heating is performed in the bath water heater 12. Moreover, even if additional heating is performed, the tapping temperature does not exceed the set temperature.
なお、給湯運転では、出湯温度を設定温度に安定化させるための各種の制御をさらに加えてもよい。たとえば、風呂給湯器12の熱交換器72が冷えた状態(所謂、コールドスタート)の場合は、貯湯タンク14に(設定温度+第1温度)以上の温度の湯水が所定量以上存在する場合であっても、風呂給湯器12で追い加熱が行われるように、混合弁17の出側から風呂給湯器12へ送り出す湯水の温度を(設定温度−第2温度)以下に制御するコールドスタート対策を加える。すなわち、追い加熱なしでは、冷えた熱交換器72に熱を奪われて、その分、出湯温度が低下する。また、冷えた熱交換器72は、該熱交換器72を通る湯水によって徐々に昇温されるので、なかなか出湯温度が上昇せず、設定温度の湯水が出るまでに長い時間を要するが、上記のコールドスタート対策により、当初から設定温度の湯を出湯することが可能になる。   In the hot water supply operation, various controls for stabilizing the hot water temperature at the set temperature may be further added. For example, when the heat exchanger 72 of the bath water heater 12 is cold (so-called cold start), the hot water storage tank 14 has a predetermined amount or more of hot water having a temperature equal to or higher than the (set temperature + first temperature). Even if there is, a cold start measure for controlling the temperature of the hot water sent from the outlet side of the mixing valve 17 to the bath water heater 12 to (set temperature−second temperature) or less so that the bath water heater 12 performs additional heating. Add. That is, without additional heating, the cooled heat exchanger 72 is deprived of heat, and the hot water temperature decreases accordingly. In addition, since the temperature of the cooled heat exchanger 72 is gradually raised by the hot water passing through the heat exchanger 72, the hot water temperature does not easily rise, and it takes a long time for the hot water to reach the set temperature. With this cold start measure, it becomes possible to discharge hot water at a preset temperature from the beginning.
<集熱運転>
集熱運転は集熱装置21で太陽光から得た熱を利用して貯湯タンク14内の水を加熱する動作である。集熱運転は、集熱装置21の高温センサ51の検出温度が貯湯タンク14内の水温より一定温度以上高いなどの運転条件を満たす場合に行われる。
<Heat collection operation>
The heat collecting operation is an operation of heating the water in the hot water storage tank 14 using heat obtained from sunlight by the heat collecting device 21. The heat collection operation is performed when an operation condition is satisfied such that the temperature detected by the high temperature sensor 51 of the heat collection device 21 is higher than the water temperature in the hot water storage tank 14 by a certain temperature or more.
集熱運転は、集熱装置21で太陽光から得た熱を利用して貯湯タンク14内の水を加熱する集熱動作と、貯湯タンク14内の湯水の温度が上がって熱回収効率が低下した場合に、貯湯タンク14内の湯水の熱を浴槽3の湯水へ移動させる熱退避動作とで構成される。熱退避動作には、貯湯タンク14の湯水を浴槽3へ注湯する第1熱退避動作と、貯湯タンク14の熱を水-水熱交換器20を通じて浴槽水へ移動させる第2熱退避動作とがある。   In the heat collection operation, the heat collection operation for heating the water in the hot water storage tank 14 using the heat obtained from sunlight by the heat collecting device 21, and the temperature of the hot water in the hot water storage tank 14 rises and the heat recovery efficiency decreases. In this case, the heat evacuation operation moves the hot water in the hot water storage tank 14 to the hot water in the bathtub 3. The heat evacuation operation includes a first heat evacuation operation for pouring hot water from the hot water storage tank 14 into the bathtub 3, and a second heat evacuation operation for moving the heat of the hot water storage tank 14 to the bathtub water through the water-water heat exchanger 20. There is.
図4は、貯湯システム11が行う集熱動作の概略を示している。貯湯タンク14は、底部の配管接続口(入口)に接続された給水管15から給水の供給を受けて、通常は満水の状態にある。集熱動作時、制御ユニット60は、切替弁25を第1接続口25aと第2接続口25bとが連通し第3接続口25cを閉鎖した状態に設定した上で、循環ポンプ24を駆動する。   FIG. 4 shows an outline of the heat collecting operation performed by the hot water storage system 11. The hot water storage tank 14 receives supply of water from a water supply pipe 15 connected to a pipe connection port (inlet) at the bottom, and is usually in a full state. During the heat collecting operation, the control unit 60 drives the circulation pump 24 after setting the switching valve 25 in a state where the first connection port 25a and the second connection port 25b communicate with each other and the third connection port 25c is closed. .
図4では、集熱動作において熱媒体(水)が循環する経路を太線で示してある。また各部において熱媒体が流れる方向を矢印で示してある。詳細には、シスターン19内の熱媒体は、循環ポンプ24の作用により、第3熱媒配管22c等を通じて集熱装置21に向かって流れ、集熱装置21を通る際に加熱されて昇温し、第4熱媒配管22dから貯湯タンク14内の熱交換用配管18を経てシスターン19へ戻るように循環する。熱交換用配管18を通る熱媒体の温度より貯湯タンク14内の熱交換用配管18の周囲の水温が低い場合、熱交換用配管18にて熱媒体の熱が貯湯タンク14内の水へ移動して貯湯タンク14内の水が加熱される。   In FIG. 4, the path through which the heat medium (water) circulates in the heat collecting operation is indicated by a bold line. The direction in which the heat medium flows in each part is indicated by arrows. Specifically, the heat medium in the cistern 19 flows toward the heat collecting device 21 through the third heat medium pipe 22c or the like by the action of the circulation pump 24, and is heated and heated when passing through the heat collecting device 21. Then, the refrigerant circulates from the fourth heat medium pipe 22d through the heat exchanging pipe 18 in the hot water storage tank 14 to return to the system 19. When the water temperature around the heat exchange pipe 18 in the hot water storage tank 14 is lower than the temperature of the heat medium passing through the heat exchange pipe 18, the heat of the heat medium moves to the water in the hot water storage tank 14 through the heat exchange pipe 18. Thus, the water in the hot water storage tank 14 is heated.
熱交換用配管18は貯湯タンク14の下部にある。また、貯湯タンク14の底部から給水が供給され、貯湯タンク14の天井部の配管接続口(出口)から接続配管16へ湯水が流出するので、貯湯タンク14内の水温は底部が低く天井部ほど高い温度勾配になっている。   The heat exchange pipe 18 is located below the hot water storage tank 14. In addition, since water is supplied from the bottom of the hot water storage tank 14 and the hot water flows out from the pipe connection port (exit) of the ceiling of the hot water storage tank 14 to the connection pipe 16, the water temperature in the hot water storage tank 14 is lower at the bottom and closer to the ceiling. The temperature gradient is high.
貯湯タンク14の湯水が出湯などに使用されない状態で集熱運転が長く継続すると、貯湯タンク14下部の熱交換用配管18の周辺の水温が上昇し、熱交換用配管18内を流れる熱媒体と熱交換用配管18の周囲の水との温度差が少なくなり、熱交換用配管18による貯湯タンク14内の湯水の加熱効率が低下する。言い換えると、熱交換用配管18を通る際に熱媒体の温度があまり下がらなくなるので、シスターン19を介して集熱装置21に送り出される熱媒体の温度も比較的高くなり、集熱装置21での太陽熱の熱回収効率(太陽熱の利用効率)が低下する。   If the heat collection operation continues for a long time without the hot water in the hot water storage tank 14 being used for hot water or the like, the water temperature around the heat exchange pipe 18 below the hot water storage tank 14 rises, and the heat medium flowing in the heat exchange pipe 18 The temperature difference with the water around the heat exchange pipe 18 is reduced, and the heating efficiency of the hot water in the hot water storage tank 14 by the heat exchange pipe 18 is lowered. In other words, since the temperature of the heat medium does not decrease much when passing through the heat exchange pipe 18, the temperature of the heat medium sent to the heat collector 21 via the cistern 19 becomes relatively high, and the heat collector 21 The heat recovery efficiency of solar heat (utilization efficiency of solar heat) decreases.
そこで、貯湯システム11は、浴槽3の水位が設定水位未満などの条件を満たして浴槽3への注湯が可能ならば、貯湯タンク14内の湯水を浴槽3に注湯する第1熱退避動作を行う。また、浴槽3に設定水位の湯水が有ってこれ以上注湯できない場合は、貯湯タンク14の湯水の熱を水-水熱交換器20を介して浴槽水へ移動させる第2熱退避動作を行うようになっている。   Accordingly, the hot water storage system 11 performs the first heat evacuation operation of pouring hot water in the hot water storage tank 14 into the bathtub 3 if the water level in the bathtub 3 satisfies conditions such as the water level being lower than the set water level and can be poured into the bathtub 3. I do. Further, when there is hot water at the set water level in the bathtub 3 and no more hot water can be poured, a second heat evacuation operation is performed to move the hot water in the hot water storage tank 14 to the bathtub water via the water-water heat exchanger 20. To do.
<第1熱退避動作>
図5は、第1熱退避動作において湯水が流れる経路を太線で示してある。第1熱退避動作は前述の集熱動作と並行に行われる、もしくは、第1熱退避動作中の集熱動作は停止される。第1熱退避動作では、貯湯システム11の制御ユニット60は風呂給湯器12に対してバーナ73の燃焼(加熱動作)を停止させた状態で注湯電磁弁78を開くように、すなわち、燃焼なしの注湯動作を指示する。
<First heat escape operation>
FIG. 5 shows a path through which hot water flows in the first heat evacuation operation by a bold line. The first heat evacuation operation is performed in parallel with the above-described heat collection operation, or the heat collection operation during the first heat evacuation operation is stopped. In the first heat evacuation operation, the control unit 60 of the hot water storage system 11 opens the hot water solenoid valve 78 in a state in which the combustion (heating operation) of the burner 73 is stopped with respect to the bath water heater 12, that is, no combustion. Instruct the pouring operation.
注湯電磁弁78が開くと、貯湯タンク14の上部の湯水が接続配管16、混合弁17を通じて風呂給湯器12に供給される。この湯水の一部は風呂給湯器12内の熱交換器72を経て、残りの湯水はバイパス管81を経てそれぞれ連結管77に至り、注湯電磁弁78を経た後、風呂往き管31と風呂戻り管32の2つの経路に分かれて浴槽3へ注湯される。   When the hot water solenoid valve 78 is opened, hot water in the upper part of the hot water storage tank 14 is supplied to the bath water heater 12 through the connection pipe 16 and the mixing valve 17. Part of this hot water passes through the heat exchanger 72 in the bath water heater 12, and the remaining hot water passes through the bypass pipe 81 to the connecting pipe 77, passes through the pouring solenoid valve 78, and then goes to the bath outlet pipe 31 and the bath. The hot water is poured into the bathtub 3 in two paths of the return pipe 32.
第1熱退避動作では、浴槽3に注湯される湯の温度が風呂の設定温度になるように、混合弁17の混合比を設定する。ここでは、接続配管16や熱交換器72を通る際の温度低下を考慮して、混合弁17の出側の温度が風呂の設定温度+2℃になるように混合弁17の混合比を制御する。   In the first heat evacuation operation, the mixing ratio of the mixing valve 17 is set so that the temperature of the hot water poured into the bathtub 3 becomes the set temperature of the bath. Here, the mixing ratio of the mixing valve 17 is controlled so that the temperature at the outlet side of the mixing valve 17 becomes the set temperature of the bath + 2 ° C. in consideration of the temperature drop when passing through the connecting pipe 16 and the heat exchanger 72. .
貯湯タンク14の上部の湯水が注湯に使用されると、これに伴って貯湯タンク14の下部に給水管15から冷たい給水が補充されて、熱交換用配管18の周囲の水温が低下する。これにより、集熱動作における太陽熱の熱回収効率(太陽熱の利用効率)が向上し回復する。   When the hot water in the upper part of the hot water storage tank 14 is used for pouring, cold water is replenished to the lower part of the hot water storage tank 14 from the water supply pipe 15 and the water temperature around the heat exchange pipe 18 is lowered. Thereby, the heat recovery efficiency (solar heat utilization efficiency) of solar heat in the heat collecting operation is improved and recovered.
第1熱退避動作は、集熱動作での太陽熱の熱回収効率が回復したら終了する。そして、再び太陽熱の熱回収効率が低下したら第1熱退避動作を開始する。したがって、第1熱退避動作による浴槽3への注湯は、少しずつ間欠的に行われる。このように、第1熱退避動作による浴槽3への注湯を少しずつ間欠的に行うので、貯湯タンク14の上部に十分な量の熱い湯が溜まっている状態を維持でき、使用者による次の出湯要求に対応することができる。   The first heat evacuation operation ends when the solar heat recovery efficiency in the heat collection operation is restored. And if the heat recovery efficiency of solar heat falls again, the 1st heat escape operation will be started. Therefore, pouring into the bathtub 3 by the first heat evacuation operation is performed little by little intermittently. Thus, since the hot water pouring into the bathtub 3 by the first heat evacuation operation is intermittently carried out little by little, it is possible to maintain a state in which a sufficient amount of hot water is accumulated in the upper part of the hot water storage tank 14, and the next by the user. It is possible to meet the demand for hot water.
<第2熱退避動作>
図6は、第2熱退避動作における熱媒体の循環経路および浴槽水の循環経路を示している。図6では、第2熱退避動作において熱媒体(水)が循環する経路を太線で、浴槽水の循環経路を太破線で示してある。さらに各部において熱媒体が流れる方向および浴槽水の流れる方向をそれぞれ矢印で示してある。
<Second heat escape operation>
FIG. 6 shows the heat medium circulation path and the bath water circulation path in the second heat evacuation operation. In FIG. 6, the path through which the heat medium (water) circulates in the second heat evacuation operation is indicated by a thick line, and the circulation path of the bath water is indicated by a thick broken line. Furthermore, in each part, the direction in which the heat medium flows and the direction in which the bathtub water flows are indicated by arrows.
第2熱退避動作では、制御ユニット60は、切替弁25を第1接続口25aと第3接続口25cとが連通し第2接続口25bを閉鎖した状態に設定した上で、循環ポンプ24を駆動する。これにより、熱媒体は、集熱装置21を迂回し、水-水熱交換器20と貯湯タンク14とを通る迂回循環経路を循環する。また、風呂給湯器12に対して燃焼(加熱動作)を停止させた状態で風呂循環ポンプ85を駆動するように指示(燃焼なしの追い焚き動作を指示)する。これにより、水-水熱交換器20の外側管路20bを経由する追い焚き循環経路を通じて浴槽水が循環する。   In the second heat evacuation operation, the control unit 60 sets the switching valve 25 in a state where the first connection port 25a and the third connection port 25c communicate with each other and the second connection port 25b is closed, and then the circulation pump 24 is turned on. To drive. Thereby, the heat medium bypasses the heat collecting device 21 and circulates in a bypass circulation path passing through the water-water heat exchanger 20 and the hot water storage tank 14. In addition, the bath water heater 12 is instructed to drive the bath circulation pump 85 in a state where combustion (heating operation) is stopped (instruction of a reheating operation without combustion). As a result, the bathtub water circulates through the recirculation circulation path that passes through the outer conduit 20 b of the water-water heat exchanger 20.
第2熱退避動作は、浴槽3に所定量(所定水位)以上の湯水が存在すること、浴槽3内の湯水の温度が設定温度以下であることなどが稼動条件になっている。第2熱退避動作では、水-水熱交換器20において、内側管路20aを通って循環する熱媒体から外側管路20bを通って循環する浴槽水へ熱が移動し、熱交換用配管18にて貯湯タンク14内の湯水の熱が熱媒体に移動する。すなわち、熱媒体を媒体して、貯湯タンク14下部の湯水の熱が浴槽水に移動し、浴槽水は昇温し、貯湯タンク14下部の湯水は温度低下する。   The second heat evacuation operation has operating conditions such as the presence of hot water of a predetermined amount (predetermined water level) or more in the bathtub 3 and the temperature of the hot water in the bathtub 3 being a set temperature or lower. In the second heat escape operation, in the water-water heat exchanger 20, heat is transferred from the heat medium circulating through the inner pipe line 20a to the bath water circulating through the outer pipe line 20b, and the heat exchange pipe 18 The hot water in the hot water storage tank 14 moves to the heat medium. That is, using the heat medium, the hot water in the lower part of the hot water storage tank 14 moves to the bath water, the temperature of the hot water in the hot water tank 14 decreases, and the temperature of the hot water in the lower part of the hot water storage tank 14 decreases.
第2熱退避動作では、熱媒体の循環経路を、集熱装置21を迂回する迂回循環経路に切り替えた上で、熱媒体の循環ポンプ24を全速で作動させる。また、浴槽水を循環させる風呂給湯器12の風呂循環ポンプ85が速度可変の場合は、風呂循環ポンプ85も全速で作動させる。   In the second heat evacuation operation, the heat medium circulation path 24 is switched to a detour circulation path that bypasses the heat collecting device 21, and the heat medium circulation pump 24 is operated at full speed. When the bath circulation pump 85 of the bath water heater 12 that circulates the bath water is variable in speed, the bath circulation pump 85 is also operated at full speed.
シスターン19が大気開放型なので、集熱装置21を迂回させて熱媒体の循環経路を短くすると、循環経路における圧損が少なくなり、循環ポンプ24による熱媒体の搬送量が増加し、貯湯タンク14下部の湯水の温度を低下させる効率が向上する。しかし、集熱装置21を迂回させることで集熱装置21に熱媒体が流れなくなるので、集熱装置21内に停留している熱媒体の温度が太陽熱を受けてどんどん上昇する。前述したように集熱装置21と貯湯システム11の本体とを繋ぐ連絡配管は耐熱温度が90℃〜95℃なので、集熱装置21内に停留している熱媒体がこの耐熱温度を超える前に、熱媒体が集熱装置21を通って循環するように循環経路を通常状態に戻す必要がある。   Since the cistern 19 is open to the atmosphere, if the circulation path of the heat medium is shortened by bypassing the heat collecting device 21, the pressure loss in the circulation path is reduced, the amount of heat medium transported by the circulation pump 24 is increased, and the lower part of the hot water storage tank 14. The efficiency of lowering the temperature of hot water is improved. However, since the heat medium does not flow through the heat collecting device 21 by bypassing the heat collecting device 21, the temperature of the heat medium stopped in the heat collecting device 21 is increased due to solar heat. As described above, the connecting pipe that connects the heat collector 21 and the main body of the hot water storage system 11 has a heat-resistant temperature of 90 ° C. to 95 ° C. Therefore, before the heat medium that is retained in the heat collector 21 exceeds this heat-resistant temperature. It is necessary to return the circulation path to the normal state so that the heat medium circulates through the heat collector 21.
そこで、熱媒体を循環させる循環ポンプ24や浴槽水を循環させる風呂給湯器12の風呂循環ポンプ85を全速で作動させる。これにより、貯湯タンク14内の湯水から浴槽水への単位時間当たりの熱の移動量が増加するので、短時間で効率よく貯湯タンク14下部の湯水の温度が低下する。その結果、第2熱退避動作が短時間で終了し、熱媒体が集熱装置21を迂回して循環する期間を短縮することができる。   Therefore, the circulation pump 24 that circulates the heat medium and the bath circulation pump 85 of the bath water heater 12 that circulates the bath water are operated at full speed. Thereby, since the amount of heat transfer per unit time from the hot water in the hot water storage tank 14 to the bathtub water increases, the temperature of the hot water in the lower part of the hot water storage tank 14 is efficiently reduced in a short time. As a result, the second heat evacuation operation is completed in a short time, and the period during which the heat medium circulates around the heat collecting device 21 can be shortened.
次に、集熱動作および熱退避動作を含む集熱運転全体の動作の流れを説明する。   Next, the overall operation flow including the heat collection operation and the heat evacuation operation will be described.
図7は、集熱運転全体の動作フローを示している。ここでは、貯湯タンク14下部の水温を第2温度センサ42の検出温度で判断するものとする。貯湯システム11は、集熱運転において第2温度センサ42の検出温度が40℃未満ならば(ステップS101;Yes)、図4に示した通常の集熱動作を継続する(ステップS102)。   FIG. 7 shows an operation flow of the entire heat collecting operation. Here, the water temperature in the lower part of the hot water storage tank 14 is determined based on the temperature detected by the second temperature sensor 42. If the temperature detected by the second temperature sensor 42 is less than 40 ° C. (step S101; Yes), the hot water storage system 11 continues the normal heat collecting operation shown in FIG. 4 (step S102).
第2温度センサ42の検出温度が40℃以上の場合は(ステップS101;No)、浴槽3内の水位が設定水位未満か否かを判断する(ステップS103)。なお、貯湯システム11の制御ユニット60は、浴槽3内の水位や浴槽水の温度の検出を風呂給湯器12に依頼し、その応答を風呂給湯器12から受け取ることで、浴槽3内の水位や浴槽水の温度を認識する。   When the temperature detected by the second temperature sensor 42 is 40 ° C. or higher (step S101; No), it is determined whether or not the water level in the bathtub 3 is lower than the set water level (step S103). The control unit 60 of the hot water storage system 11 requests the bath water heater 12 to detect the water level in the bathtub 3 and the temperature of the bathtub water, and receives the response from the bath water heater 12 to thereby detect the water level in the bathtub 3. Recognize the temperature of bathtub water.
浴槽3内の水位が設定水位未満ならば(ステップS103;Yes)、図5に示した第1熱退避動作を行う。詳細には、風呂給湯器12に対して、バーナ73の燃焼なしに注湯電磁弁78を開くように要求する。また、混合弁17の出側の湯温が、たとえば、風呂の設定温度+2℃になるように混合弁17を制御する。第1熱退避動作による注湯動作を行うことで、貯湯タンク14の下部には給水が補充され、貯湯タンク14下部の湯水の温度が低下する。   If the water level in the bathtub 3 is less than the set water level (step S103; Yes), the first heat evacuation operation shown in FIG. 5 is performed. Specifically, the bath water heater 12 is requested to open the hot water solenoid valve 78 without burning the burner 73. In addition, the mixing valve 17 is controlled so that the hot water temperature on the outlet side of the mixing valve 17 becomes, for example, the set temperature of the bath + 2 ° C. By performing the pouring operation by the first heat evacuation operation, the lower portion of the hot water storage tank 14 is supplemented with water supply, and the temperature of the hot water in the lower portion of the hot water storage tank 14 is lowered.
第1熱退避動作の開始後、制御ユニット60は、第2温度センサ42の検出温度が、40℃より低い所定の温度(ここでは35℃とする)以下になるか否か(ステップS105)、および浴槽3の水位が設定水位に到達するか否か(ステップS106)を監視し、第2温度センサ42の検出温度が35℃以下になった場合(ステップS105;Yes)、もしくは浴槽3の水位が設定水位に到達した場合は(ステップS106;Yes)、第1熱退避動作を停止させる(ステップS107)。具体的には、風呂給湯器12に対して注湯電磁弁78を閉じるように、すなわち、燃焼なしの注湯動作を停止するように指示する。その後、ステップS101に戻って処理を継続する。   After the start of the first heat evacuation operation, the control unit 60 determines whether or not the temperature detected by the second temperature sensor 42 is equal to or lower than a predetermined temperature lower than 40 ° C. (here 35 ° C.) (step S105). Whether the water level of the bathtub 3 reaches the set water level (step S106) and the detected temperature of the second temperature sensor 42 is 35 ° C. or lower (step S105; Yes), or the water level of the bathtub 3 Reaches the set water level (step S106; Yes), the first heat evacuation operation is stopped (step S107). Specifically, it instructs the bath water heater 12 to close the pouring solenoid valve 78, that is, stop the pouring operation without combustion. Then, it returns to step S101 and continues a process.
上記のように第2温度センサ42の検出温度が40℃になった場合に第1熱退避動作を開始し、35℃に下がったら第1熱退避動作を停止させるので、第1熱退避動作は間欠的に繰り返し行われて、浴槽3に少しずつ注湯される。そのため、第1熱退避動作に起因して貯湯タンク14上部の高温の湯水が短時間に大量に減少することはなく、熱い湯を貯湯タンク14の上部に十分確保しながら、貯湯タンク14下部の湯水の温度を下げて、太陽熱の熱回収効率低下を防ぐことができる。   As described above, when the temperature detected by the second temperature sensor 42 reaches 40 ° C., the first heat evacuation operation is started. When the temperature is lowered to 35 ° C., the first heat evacuation operation is stopped. It is repeated intermittently and poured into the bathtub 3 little by little. Therefore, the hot water in the upper part of the hot water storage tank 14 does not decrease in a large amount in a short time due to the first heat evacuation operation, and the hot water in the upper part of the hot water storage tank 14 is secured sufficiently, The temperature of the hot water can be lowered to prevent a decrease in solar heat recovery efficiency.
浴槽3の水位が設定水位に達しているときは(ステップS103;No)、浴槽3内の湯水の温度が風呂の設定温度未満か否かを調べる(ステップS108)。浴槽3内の湯水の温度が風呂の設定温度未満の場合は(ステップS108;Yes)、熱媒体の循環経路を、集熱装置21を迂回する迂回循環経路に切り替えて(ステップS109)、図6に示した第2熱退避動作を開始する(ステップS110)。詳細には、風呂給湯器12に対して燃焼(加熱動作)を停止させた状態で風呂循環ポンプ85を駆動するように指示する。熱媒体の循環ポンプ24は全速で駆動する。また、風呂給湯器12の風呂循環ポンプ85が速度可変ならば、風呂給湯器12に対して風呂循環ポンプ85を全速で動作させるように指示する。   When the water level of the bathtub 3 has reached the set water level (step S103; No), it is checked whether or not the temperature of the hot water in the bathtub 3 is lower than the set temperature of the bath (step S108). When the temperature of the hot water in the bathtub 3 is lower than the set temperature of the bath (step S108; Yes), the heat medium circulation path is switched to a bypass circulation path that bypasses the heat collecting device 21 (step S109), and FIG. The second heat evacuation operation shown in (2) is started (step S110). Specifically, the bath water heater 12 is instructed to drive the bath circulation pump 85 in a state where combustion (heating operation) is stopped. The heat medium circulation pump 24 is driven at full speed. If the bath circulation pump 85 of the bath water heater 12 is variable in speed, the bath water heater 12 is instructed to operate the bath circulation pump 85 at full speed.
これにより、貯湯タンク14下部の湯水の熱が水-水熱交換器20にて浴槽水へ移動するようになり、貯湯タンク14下部の湯水の温度が低下する。   Thereby, the heat of the hot water in the lower part of the hot water storage tank 14 moves to the bathtub water in the water-water heat exchanger 20, and the temperature of the hot water in the lower part of the hot water storage tank 14 is lowered.
第2熱退避動作の開始後、制御ユニット60は、第2温度センサ42の検出温度が40℃より低い所定の温度(ここでは35℃とする)以下になるか否かを監視する(ステップS111)。第2温度センサ42の検出温度が35℃以下になったら(ステップS111;Yes)、第2熱退避動作を停止させる。(ステップS107)。具体的には、風呂給湯器12に対して風呂循環ポンプ85の停止を指示する。さらに、熱媒体の循環経路を、集熱装置21を経由する通常の循環経路に戻し、循環ポンプ24の速度制御を通常の制御に戻す。(ステップS113)。その後、ステップS101へ移行して処理を継続する。   After the start of the second heat evacuation operation, the control unit 60 monitors whether or not the temperature detected by the second temperature sensor 42 is equal to or lower than a predetermined temperature lower than 40 ° C. (here, 35 ° C.) (step S111). ). When the detected temperature of the second temperature sensor 42 becomes 35 ° C. or lower (step S111; Yes), the second heat evacuation operation is stopped. (Step S107). Specifically, the bath water heater 12 is instructed to stop the bath circulation pump 85. Furthermore, the circulation path of the heat medium is returned to the normal circulation path via the heat collecting device 21, and the speed control of the circulation pump 24 is returned to the normal control. (Step S113). Thereafter, the process proceeds to step S101 to continue the processing.
浴槽3内の湯水の温度が風呂の設定温度に達しているときは(ステップS108;No)、通常の集熱動作を行う(ステップS102)。この場合、第1、第2いずれの熱退避動作も実行できないので太陽熱の熱回収効率は低いが、集熱動作を行うことで、太陽熱を貯湯タンク14の湯水に蓄熱することができる。   When the temperature of the hot water in the bathtub 3 has reached the set temperature of the bath (step S108; No), a normal heat collecting operation is performed (step S102). In this case, since neither the first or second heat evacuation operation can be performed, the solar heat recovery efficiency is low, but the solar heat can be stored in the hot water in the hot water storage tank 14 by performing the heat collection operation.
なお、第2温度センサ42等の検出水温が、規定の上限温度(たとえば80℃)に達した場合は、集熱運転自体(図7の処理)が中止される。   Note that when the detected water temperature of the second temperature sensor 42 or the like reaches a specified upper limit temperature (for example, 80 ° C.), the heat collection operation itself (the process of FIG. 7) is stopped.
上記のように、浴槽3が既に設定水位に達していて注湯できない場合でも、浴槽水を追い焚きする第2熱退避動作によって貯湯タンク14下部の湯水の温度を下げることができるので、太陽熱の熱回収効率の低下を防ぐことができる。   As described above, even when the bathtub 3 has already reached the set water level and cannot be poured, the temperature of the hot water in the lower part of the hot water storage tank 14 can be lowered by the second heat evacuation operation for chasing the bathtub water. A decrease in heat recovery efficiency can be prevented.
本発明では、集熱運転中に貯湯タンク14内の湯水の温度が上昇し、これ以上の蓄熱が難しくなった場合でも、貯湯タンク14内の湯水を浴槽3へ注湯する第1熱退避動作、あるいは、貯湯タンク14内の湯水の熱で浴槽水を昇温(追い焚き)する第2熱退避動作を行うことで、貯湯タンク14内の湯水の温度を下げて、太陽熱の熱回収効率の低下を防ぐことができる。第1、第2の熱退避動作は、言い換えれば、浴槽3を太陽熱の蓄熱場所として利用する動作であり、浴槽3は、貯湯タンク14のサブタンク的な役割を果たす。   In the present invention, even when the temperature of the hot water in the hot water storage tank 14 rises during the heat collecting operation and it becomes difficult to store heat further, the first heat evacuation operation for pouring hot water in the hot water storage tank 14 into the bathtub 3 is performed. Alternatively, the temperature of the hot water in the hot water storage tank 14 is lowered by performing a second heat evacuation operation for raising the temperature of the bathtub water with the heat of the hot water in the hot water storage tank 14. Decline can be prevented. In other words, the first and second heat evacuation operations are operations using the bathtub 3 as a solar heat storage place, and the bathtub 3 plays a sub-tank role of the hot water storage tank 14.
次に、浴槽3に退避させた熱を貯湯タンク14に戻す風呂熱回収運転について説明する。   Next, a bath heat recovery operation for returning the heat evacuated to the bathtub 3 to the hot water storage tank 14 will be described.
風呂熱回収運転は、風呂の残り湯の熱を利用して貯湯タンク14内の湯水を加熱する動作である。すなわち、サブタンク(浴槽)に退避させた熱を貯湯タンク14に戻す動作である。   The bath heat recovery operation is an operation of heating the hot water in the hot water storage tank 14 using the heat of the remaining hot water in the bath. That is, it is an operation for returning the heat evacuated to the sub tank (tub) to the hot water storage tank 14.
風呂熱回収運転における湯水および熱媒体の循環経路は、図6に示す第2熱退避動作と同様である。すなわち、風呂熱回収運転では、制御ユニット60は、切替弁25を第1接続口25aと第3接続口25cとが連通し第2接続口25bを閉鎖した状態に設定した上で、循環ポンプ24を駆動する。これにより、集熱装置21を通らずに、水-水熱交換器20と貯湯タンク14とを通って熱媒体が循環する。また、風呂給湯器12に対して燃焼(加熱動作)を停止させた状態で風呂循環ポンプ85を駆動するように指示する。これにより、浴槽水が、水-水熱交換器20の外側管路20bを含む追い焚き循環経路を循環する。   The hot water and heat medium circulation paths in the bath heat recovery operation are the same as those in the second heat evacuation operation shown in FIG. That is, in the bath heat recovery operation, the control unit 60 sets the switching valve 25 in a state where the first connection port 25a and the third connection port 25c communicate with each other and the second connection port 25b is closed, and then the circulation pump 24 Drive. As a result, the heat medium circulates through the water-water heat exchanger 20 and the hot water storage tank 14 without passing through the heat collector 21. Further, the bath water heater 12 is instructed to drive the bath circulation pump 85 in a state where combustion (heating operation) is stopped. As a result, the bathtub water circulates in the recirculation circulation path including the outer conduit 20 b of the water-water heat exchanger 20.
風呂熱回収運転は、貯湯タンク14内の水温(たとえば、第1温度センサ41の検出温度)が浴槽3の水温より低いことが運転条件となっており、水-水熱交換器20において、外側管路20bを通る浴槽水から内側管路20aを通る熱媒体へ熱が移動し、この熱が熱交換用配管18の部分で貯湯タンク14内の水へ移動することで、貯湯タンク14内の水が加熱される。   The bath heat recovery operation is performed under the condition that the water temperature in the hot water storage tank 14 (for example, the temperature detected by the first temperature sensor 41) is lower than the water temperature in the bathtub 3, and the water-water heat exchanger 20 Heat is transferred from the bathtub water passing through the pipe line 20b to the heat medium passing through the inner pipe line 20a, and this heat is transferred to the water in the hot water storage tank 14 at the portion of the heat exchange pipe 18, whereby Water is heated.
より詳細には、風呂熱回収運転では、まず、風呂循環ポンプ85を一時的に作動させ、浴槽水があるか否かを確認する。そして、浴槽水があり、かつ、浴槽水の温度が第1温度センサ41の検出温度より所定温度(たとえば、15℃)以上高い場合に風呂熱回収運転を行い、差が10℃以下もしくは1時間を越えると運転を停止する。時間的制限は、風呂循環ポンプ85の耐久性を考慮したものである。   More specifically, in the bath heat recovery operation, first, the bath circulation pump 85 is temporarily activated to check whether there is bathtub water. Then, when there is bathtub water and the temperature of the bathtub water is higher than the temperature detected by the first temperature sensor 41 by a predetermined temperature (for example, 15 ° C.) or more, the bath heat recovery operation is performed, and the difference is 10 ° C. or less or 1 hour. If it exceeds, operation stops. The time limit is based on the durability of the bath circulation pump 85.
このように、風呂熱回収運転では、サブタンクとしての浴槽3に退避させた熱を必要に応じて貯湯タンク14に戻すことができる。たとえば、夜になって1日の集熱運転が終了し、かつ、風呂の自動運転がオフになったときに風呂熱回収運転を行えば、翌日の集熱運転の負担が軽減される。   Thus, in the bath heat recovery operation, the heat retreated to the bathtub 3 as a sub tank can be returned to the hot water storage tank 14 as necessary. For example, if the bath heat recovery operation is performed when the heat collection operation of the day ends at night and the automatic operation of the bath is turned off, the burden of the heat collection operation on the next day is reduced.
以上、本発明の実施の形態を図面によって説明してきたが、具体的な構成は実施の形態に示したものに限られるものではなく、本発明の要旨を逸脱しない範囲における変更や追加があっても本発明に含まれる。   The embodiment of the present invention has been described with reference to the drawings. However, the specific configuration is not limited to that shown in the embodiment, and there are changes and additions within the scope of the present invention. Are also included in the present invention.
たとえば、第1熱退避動作中は、集熱動作を停止してよいし、集熱動作を並行に行うようにしてもよい。   For example, during the first heat evacuation operation, the heat collection operation may be stopped, or the heat collection operation may be performed in parallel.
また、実施の形態では、第2熱退避動作の実行中は、熱媒体の循環経路を迂回循環経路に切り替えるようにしたが、熱媒体の循環経路は集熱動作と同様にしておき、第2熱退避動作の実行中に集熱動作を並行して行うように構成してもよい。   In the embodiment, during the execution of the second heat evacuation operation, the circulation path of the heat medium is switched to the bypass circulation path. However, the circulation path of the heat medium is set in the same manner as the heat collection operation. You may comprise so that heat collection operation | movement may be performed in parallel during execution of heat evacuation operation | movement.
図8は、集熱運転と第2熱退避動作とを並行に実行する場合の浴槽水および熱媒体の経路を示している。同図では、集熱動作において熱媒体(水)が循環する経路を太線で示してあり、浴槽水の循環経路を太破線で示してある。集熱動作を並行に実行すれば、集熱装置21に熱媒体が停留しないので、第2熱退避動作を継続でき、切替弁25の切り替え回数を少なくすることができる。   FIG. 8 shows the paths of the bath water and the heat medium when the heat collection operation and the second heat evacuation operation are executed in parallel. In the figure, the path through which the heat medium (water) circulates in the heat collecting operation is indicated by a thick line, and the circulation path of the bathtub water is indicated by a thick broken line. If the heat collecting operation is executed in parallel, the heat medium does not stay in the heat collecting device 21, so that the second heat evacuation operation can be continued and the number of switching of the switching valve 25 can be reduced.
また、実施の形態では第2温度センサ42の検出温度を、第1熱退避動作および第2熱退避動作を実行するか否かの判断基準としたが、第1温度センサ41など、貯湯タンク14下部の湯水の温度を検出するセンサであれば他のセンサでもかまわない。なお、第1熱退避動作および第2熱退避動作を実行するか否かの判断基準は、太陽熱の熱回収効率の低下・回復を判断できれば、他の方法でもよい。   In the embodiment, the temperature detected by the second temperature sensor 42 is used as a criterion for determining whether or not to execute the first heat evacuation operation and the second heat evacuation operation. Other sensors may be used as long as they detect the temperature of the lower hot water. It should be noted that other criteria may be used as a criterion for determining whether or not to execute the first heat evacuation operation and the second heat evacuation operation as long as it is possible to determine a decrease or recovery in solar heat recovery efficiency.
実施の形態では、第2温度センサ42の検出温度が40℃以上になることを熱退避動作の開始条件とし、第2温度センサ42の検出温度が35℃以下になることを熱退避動作の停止条件としたが、これらの温度は例示であり、適宜に設定すればよい。   In the embodiment, the start condition of the heat evacuation operation is that the detected temperature of the second temperature sensor 42 is 40 ° C. or more, and the stop of the heat evacuation operation is that the detected temperature of the second temperature sensor 42 is 35 ° C. or less. However, these temperatures are merely examples, and may be set appropriately.
また、第2熱退避動作の終了を判断する温度は38℃など、第2熱退避動作の開始条件となる40℃に比較的近い温度にしてもよい。すなわち、迂回循環経路に切り替えている間に集熱装置21に停留している熱媒体の温度はどんどん上昇するので、この温度が架橋ポリエチレン製の連絡配管の耐熱温度を越えないように、第2熱退避動作の停止を判断する閾値温度と第2熱退避動作の開始条件となる閾値温度との温度差を、第1熱退避動作の場合より小さくし、1回の第2熱退避動作が短時間のうちに停止・終了するようにしてもよい。   The temperature at which the end of the second heat evacuation operation is determined may be a temperature that is relatively close to 40 ° C., which is the starting condition for the second heat evacuation operation, such as 38 ° C. That is, since the temperature of the heat medium stopped in the heat collecting device 21 is increased while switching to the bypass circulation path, the second temperature is set so that the temperature does not exceed the heat resistance temperature of the connecting pipe made of cross-linked polyethylene. The temperature difference between the threshold temperature for determining the stop of the heat evacuation operation and the threshold temperature that is the start condition of the second heat evacuation operation is made smaller than that in the case of the first heat evacuation operation, and one second heat evacuation operation is short. You may make it stop and complete | finish in time.
また、迂回循環経路に切り替えて第2熱退避動作を行っている際に、集熱装置21に設けた高温センサ51の温度が連絡配管の耐熱温度に近い所定の温度に達したとき、強制的に第2熱退避動作を停止させて、あるいは第2熱退避動作を継続させたまま、熱媒体の循環経路を通常の循環経路に戻し、集熱装置21を経由して熱媒体が循環するようにしてもよい。   Further, when the second heat evacuation operation is performed by switching to the bypass circulation path, when the temperature of the high temperature sensor 51 provided in the heat collecting device 21 reaches a predetermined temperature close to the heat resistance temperature of the communication pipe, While the second heat evacuation operation is stopped or the second heat evacuation operation is continued, the heat medium circulation path is returned to the normal circulation path so that the heat medium circulates via the heat collector 21. It may be.
このほか、実施の形態では、バーナ73を燃焼させて加熱するタイプの風呂給湯器12を使用したが、風呂給湯器の熱源はバーナに限定されるものではない。   In addition, in the embodiment, the bath water heater 12 of the type that burns and heats the burner 73 is used, but the heat source of the bath water heater is not limited to the burner.
また、貯湯タンク14から供給する湯水を出湯と風呂の注湯に利用可能であればよく、貯湯システム11の後段に風呂給湯器12を設けることは必須ではない。たとえば、接続配管16を途中で分岐し、一方は出湯栓に通じ、他方は注湯弁を介して浴槽3に通じるような構成でもよく、この場合、貯湯システム11からその注湯弁の開閉を制御すればよい。さらに貯湯システム11が、浴槽水の循環経路と浴槽水を循環させるポンプとを備える構成としてもよい。   Further, it is only necessary that the hot water supplied from the hot water storage tank 14 can be used for hot water and pouring of the bath, and it is not essential to provide the bath water heater 12 at the rear stage of the hot water storage system 11. For example, the connection pipe 16 may be branched in the middle, one leading to a hot water tap and the other leading to the bathtub 3 via a pouring valve. In this case, the hot water storage system 11 can open and close the pouring valve. Control is sufficient. Further, the hot water storage system 11 may include a bathtub water circulation path and a pump for circulating the bathtub water.
実施の形態では、水-水熱交換器20を利用して第2熱退避動作を行うようにしたが、たとえば、貯湯タンク14内の下部に、第2の熱交換用配管を通し、風呂往き管31もしくは風呂戻り管32の途中にこの第2の熱交換用配管を介挿するような構成としてもよい。また第2の熱交換用配管を通すか迂回させるかを切り替える弁を設け、通常の追い焚き動作では迂回させ、第2熱退避動作を行う場合は浴槽水が第2の熱交換用配管を経由して循環するように構成してもよい。   In the embodiment, the second heat evacuation operation is performed using the water-water heat exchanger 20. For example, the second heat exchange pipe is passed through the lower part of the hot water storage tank 14 to go to the bath. The second heat exchange pipe may be inserted in the middle of the pipe 31 or the bath return pipe 32. In addition, a valve that switches between passing or bypassing the second heat exchange pipe is provided, bypassing in a normal reheating operation, and bath water passing through the second heat exchange pipe in performing the second heat escape operation And may be configured to circulate.
なお、実施の形態では、風呂給湯器12を一缶二水路型としたが風呂の追い焚きと給湯とを別々の熱交換器で行う給湯器であってもかまわない。   In the embodiment, the bath water heater 12 is of a single can and two water channel type, but it may be a water heater that performs separate bathing and hot water supply using separate heat exchangers.
3…浴槽
10…給湯システム
11…貯湯システム
12…風呂給湯器
13…給湯配管
14…貯湯タンク
15…給水管
15a…分岐給水管
16…接続配管
17…混合弁
17a…第1バルブ
17b…第2バルブ
18…熱交換用配管
19…シスターン
19a…水位センサ
19b…大気開放用の開口
19c…チューブ
20a…内側管路
20b…外側管路
21…集熱装置
22…熱媒体循環経路
22a…第1熱媒配管
22b…第2熱媒配管
22c…第3熱媒配管
22d…第4熱媒配管
24…循環ポンプ
25…切替弁
25a…第1接続口
25b…第2接続口
25c…第3接続口
26…連結管
27a、27b…連結管の接続部
31…風呂往き管
32…風呂戻り管
41…第1温度センサ
42…第2温度センサ
43…第3温度センサ
44…第4温度センサ
46…タンク出湯温度センサ
47…給水温度センサ
48…水量センサ
49…混合温度センサ
51…高温センサ
52…熱媒温度センサ
53…風呂温度センサ
54…出湯禁止電磁弁
55…排水電磁弁
56…圧力逃がし弁
60…制御ユニット
70…制御基盤
71…入水管
72…熱交換器
72a…給湯用水管
72b…追い炊き用水管
72c…フィン
73…バーナ
74…ガス供給管
75…ガス弁
76…比例弁
77…連結管
78…注湯電磁弁
79…水量サーボ
80…出湯温度センサ
81…バイパス管
82…バイパス調整弁
83…流量センサ
84…入水温度センサ
85…風呂循環ポンプ
86…流水スイッチ
87…風呂往き温度センサ
88…風呂戻り温度センサ
89…操作パネル(共通リモコン)
89a…時計部
91…給湯水管出口温度センサ
DESCRIPTION OF SYMBOLS 3 ... Bathtub 10 ... Hot water supply system 11 ... Hot water storage system 12 ... Bath water heater 13 ... Hot water supply pipe 14 ... Hot water storage tank 15 ... Water supply pipe 15a ... Branch water supply pipe 16 ... Connection pipe 17 ... Mixing valve 17a ... 1st valve 17b ... 2nd Valve 18 ... Heat exchange pipe 19 ... Systurn 19a ... Water level sensor 19b ... Opening to atmosphere 19c ... Tube 20a ... Inner pipe line 20b ... Outer pipe line 21 ... Heat collector 22 ... Heat medium circulation path 22a ... First heat Medium piping 22b ... second heating medium piping 22c ... third heating medium piping 22d ... fourth heating medium piping 24 ... circulation pump 25 ... switching valve 25a ... first connection port 25b ... second connection port 25c ... third connection port 26 ... connecting pipes 27a, 27b ... connecting pipe connection part 31 ... bath outlet pipe 32 ... bath return pipe 41 ... first temperature sensor 42 ... second temperature sensor 43 ... third temperature sensor 44 ... Fourth temperature sensor 46 ... Tank hot water temperature sensor 47 ... Water supply temperature sensor 48 ... Water volume sensor 49 ... Mixing temperature sensor 51 ... High temperature sensor 52 ... Heat medium temperature sensor 53 ... Bath temperature sensor 54 ... Hot water prohibition solenoid valve 55 ... Drainage solenoid valve 56 ... Pressure relief valve 60 ... Control unit 70 ... Control base 71 ... Inlet pipe 72 ... Heat exchanger 72a ... Hot water supply water pipe 72b ... Additional cooking water pipe 72c ... Fin 73 ... Burner 74 ... Gas supply pipe 75 ... Gas valve 76 ... Proportional valve 77 ... Connecting pipe 78 ... Pouring solenoid valve 79 ... Water volume servo 80 ... Hot water temperature sensor 81 ... Bypass pipe 82 ... Bypass adjustment valve 83 ... Flow rate sensor 84 ... Incoming water temperature sensor 85 ... Bath circulation pump 86 ... Running water switch 87 ... Bath temperature sensor 88 ... Bath return temperature sensor 89 ... Control panel (common remote control)
89a ... Clock unit 91 ... Hot water pipe outlet temperature sensor

Claims (9)

  1. 入口に給水管が接続され、開閉制御される注湯弁を介して浴槽に通じた管路が出口に接続された貯湯タンクと、
    太陽熱を集熱する集熱装置で得た熱で前記貯湯タンク内の水を昇温する加熱装置と、
    前記集熱装置で得た熱を回収する集熱運転を制御する制御部と、
    を有し、
    前記集熱運転は、前記集熱装置で得た熱により前記貯湯タンク内の水を前記加熱装置で昇温する集熱動作と、前記貯湯タンク内の湯水の温度が上がって熱回収効率が低下した場合に前記貯湯タンク内の熱を浴槽の湯水へ移動させる熱退避動作とを有し、
    前記制御部は、前記熱退避動作の1つとして、少なくとも前記貯湯タンク内の湯水の温度が所定温度以上であることを条件に、前記注湯弁が開いて前記貯湯タンク内の湯水が前記浴槽へ注湯される第1制御を行う
    ことを特徴とする太陽熱利用システム。
    A hot water storage tank with a water supply pipe connected to the inlet, and a pipe connected to the bathtub through a pouring valve controlled to open and close;
    A heating device for raising the temperature of the water in the hot water storage tank with heat obtained by a heat collecting device for collecting solar heat;
    A control unit for controlling a heat collecting operation for collecting heat obtained by the heat collecting device;
    Have
    The heat collecting operation includes a heat collecting operation for raising the temperature of the water in the hot water storage tank by the heating device by the heat obtained by the heat collecting device, and the temperature of the hot water in the hot water storage tank is increased, thereby reducing the heat recovery efficiency. A heat evacuation operation to move the heat in the hot water storage tank to the hot water in the bathtub when
    As one of the heat evacuation operations, the controller opens the pouring valve so that the hot water in the hot water storage tank is transferred to the bathtub on the condition that the temperature of the hot water in the hot water storage tank is at least a predetermined temperature. A solar heat utilization system characterized by performing a first control to be poured into the water.
  2. 前記入口は前記貯湯タンクの下部に設けられ、
    前記出口は前記貯湯タンクの上部に設けられ、
    前記加熱装置は、前記貯湯タンクの下部の湯水を加熱し、
    前記制御部は、前記貯湯タンクの下部の湯水の温度が前記所定温度以上か否かを判定する
    ことを特徴とする請求項1に記載の太陽熱利用システム。
    The inlet is provided in the lower part of the hot water storage tank,
    The outlet is provided in the upper part of the hot water storage tank,
    The heating device heats hot water in the lower part of the hot water storage tank,
    The solar control system according to claim 1, wherein the control unit determines whether or not a temperature of hot water in a lower portion of the hot water storage tank is equal to or higher than the predetermined temperature.
  3. 前記制御部は、前記貯湯タンク内の湯水の温度が前記所定温度より低い第2温度に低下したとき、前記第1制御を停止させて、該第1制御による注湯を少量ずつ間欠的に行う
    ことを特徴とする請求項1または2に記載の太陽熱利用システム。
    When the temperature of the hot water in the hot water storage tank drops to a second temperature lower than the predetermined temperature, the control unit stops the first control and intermittently performs hot water pouring by the first control. The solar-heat utilization system of Claim 1 or 2 characterized by the above-mentioned.
  4. 一端が前記浴槽に開口された浴槽水取込口に接続され他端が前記浴槽に開口された浴槽水戻し口に接続されかつポンプで浴槽水を循環させることのできる浴槽水循環経路の途中に設けられて、前記貯湯タンク内の湯を熱源として前記浴槽水循環経路内の湯水を加熱する第2加熱装置をさらに有し、
    前記制御部は、前記熱退避動作の1つとして、少なくとも前記貯湯タンク内の湯水の温度が所定温度以上であって前記浴槽内の水位が前記浴槽水取込口に達していることを条件に、前記浴槽水循環経路に浴槽水が循環すると共に前記第2加熱装置が作用して前記貯湯タンク内の湯水の熱で前記浴槽水循環経路内の湯水が加熱される第2制御を行う
    ことを特徴とする請求項1乃至3のいずれか1項に記載の太陽熱利用システム。
    One end is connected to the bathtub water intake opening opened in the bathtub, the other end is connected to the bathtub water return opening opened in the bathtub, and provided in the middle of the bathtub water circulation path through which the bathtub water can be circulated by a pump And a second heating device that heats the hot water in the bathtub water circulation path using the hot water in the hot water storage tank as a heat source,
    The controller, as one of the heat evacuation operations, is provided that at least the temperature of the hot water in the hot water storage tank is equal to or higher than a predetermined temperature, and the water level in the bathtub reaches the bathtub water intake port. And the second water heating device acts to heat the hot water in the hot water storage tank and heat the hot water in the hot water storage tank to perform the second control. The solar heat utilization system according to any one of claims 1 to 3.
  5. 前記制御部は、前記浴槽内の水位が設定水位未満であることを条件に前記第1制御を行い、前記浴槽内の水位が設定水位に達している場合は前記第2制御を行う
    ことを特徴とする請求項4に記載の太陽熱利用システム。
    The control unit performs the first control on condition that the water level in the bathtub is lower than a set water level, and performs the second control when the water level in the bathtub reaches the set water level. The solar heat utilization system according to claim 4.
  6. 前記加熱装置は、前記集熱装置と、前記貯湯タンク内の湯水を加熱するための熱交換器と、前記集熱装置と前記熱交換器との間に形成された熱媒体流体の循環経路と、前記循環経路を通じて前記集熱装置と前記熱交換器との間で熱媒体流体を循環させる循環ポンプとを有し、
    前記第2加熱装置は、第1熱交換管が前記循環経路の途中に接続され、前記第1熱交換管と熱交換する第2熱交換管が前記浴槽水循環経路の途中に接続された第2熱交換器を有し、
    前記循環経路を、前記集熱装置を通る通常経路と前記集熱装置を迂回する迂回経路に切り替える切替弁を備え、
    前記制御部は、前記第2制御において、前記切替弁で前記循環経路を前記迂回経路に設定して前記循環ポンプを全速で作動させ、前記貯湯タンク内の湯水の温度が前記所定温度より低い第2温度に低下したとき前記第2制御を停止する
    ことを特徴とする請求項4または5に記載の太陽熱利用システム。
    The heating device includes the heat collecting device, a heat exchanger for heating hot water in the hot water storage tank, and a heat medium fluid circulation path formed between the heat collecting device and the heat exchanger. A circulation pump for circulating a heat medium fluid between the heat collecting device and the heat exchanger through the circulation path,
    In the second heating device, a first heat exchange pipe is connected in the middle of the circulation path, and a second heat exchange pipe that exchanges heat with the first heat exchange pipe is connected in the middle of the bathtub water circulation path. Have a heat exchanger,
    A switching valve for switching the circulation path to a normal path that passes through the heat collector and a bypass path that bypasses the heat collector;
    In the second control, the control unit sets the circulation path to the bypass path with the switching valve to operate the circulation pump at full speed, and the temperature of the hot water in the hot water storage tank is lower than the predetermined temperature. The solar heat utilization system according to claim 4 or 5, wherein the second control is stopped when the temperature falls to two temperatures.
  7. 前記貯湯タンクの前記出口には、前記注湯弁を有して前記浴槽への注湯機能を備えた風呂給湯器の給水口に通じる配管が接続され、
    前記制御部は、前記第1制御において、前記風呂給湯器に対して加熱なしに注湯動作を行うように指示する
    ことを特徴とする請求項1乃至6のいずれか1項に記載の太陽熱利用システム。
    The outlet of the hot water storage tank is connected to a pipe leading to a water supply port of a bath water heater having the pouring valve and having a function of pouring water into the bathtub.
    The solar control according to any one of claims 1 to 6, wherein the control unit instructs the bath water heater to perform a pouring operation without heating in the first control. system.
  8. 前記風呂給湯器は、前記ポンプで前記浴槽内の湯水を前記浴槽水循環経路に循環させて前記浴槽の湯水を追い焚きする機能を有し、
    前記制御部は、前記第2制御において、前記風呂給湯器に対して加熱なしに前記ポンプを作動させるように指示する
    ことを特徴とする請求項4乃至6のいずれか1項を引用する請求項7に記載の太陽熱利用システム。
    The bath water heater has a function of circulating hot water in the bathtub by circulating the hot water in the bathtub to the bathtub water circulation path with the pump,
    The said control part instruct | indicates to operate the said pump without heating with respect to the said bath water heater in said 2nd control. The citation of any one of Claims 4 thru | or 6 characterized by the above-mentioned. The solar heat utilization system according to 7.
  9. 前記風呂給湯器を含むことを特徴とする請求項7または8に記載の太陽熱利用システム。   The solar heat utilization system according to claim 7 or 8, comprising the bath water heater.
JP2011211452A 2011-09-27 2011-09-27 Solar heat utilization system Expired - Fee Related JP5901920B2 (en)

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