JP2013210120A - Storage type hot water supply system - Google Patents

Storage type hot water supply system Download PDF

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JP2013210120A
JP2013210120A JP2012079255A JP2012079255A JP2013210120A JP 2013210120 A JP2013210120 A JP 2013210120A JP 2012079255 A JP2012079255 A JP 2012079255A JP 2012079255 A JP2012079255 A JP 2012079255A JP 2013210120 A JP2013210120 A JP 2013210120A
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hot water
return
temperature
storage tank
flow path
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JP5582161B2 (en
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Satoshi Akagi
智 赤木
Fumitake Unezaki
史武 畝崎
Masaki Toyoshima
正樹 豊島
So Hiraoka
宗 平岡
Toshinori Sugiki
稔則 杉木
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Mitsubishi Electric Corp
三菱電機株式会社
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Abstract

PROBLEM TO BE SOLVED: To provide a storage type hot water supply system that can improve energy saving performance by surely reusing the amount of heat of hot water returning to a storage tank 1 from a heat exchanger.SOLUTION: A storage type hot water supply system includes: a heat exchanger (heat exchanger 5 for additional heating) for heating an object to be heated; a delivery means for delivering hot water led out from a storage tank 1 to the heat exchanger; an upper return flow path 307b for allowing the return hot water that is the hot water delivered to the heat exchanger led out from the storage tank 1 and having a lowered temperature as a result of passing through the heat exchanger, to flow into an upper region of the storage tank 1 that is above a temperature boundary layer; a lower return flow path 307c for allowing the return hot water to flow into a lower region of the storage tank 1 that is below the temperature boundary layer; a flow path switching means (flow path switching valve 7) for switching a state in which the return hot water flows into the upper return flow path 307b and a state in which the return hot water flows into the lower return flow path 307c; and a control means 100 for controlling the flow path switching means.

Description

本発明は、貯湯式給湯システムに関する。   The present invention relates to a hot water storage type hot water supply system.
貯湯式給湯システムは、給湯負荷の発生に対して湯切れの生じることのないように、事前に加熱手段により沸上げられた給湯用の湯を貯湯タンクに溜めておき、当該貯湯タンクから給湯を行うシステムである。貯湯式給湯システムは、瞬間式給湯システム等と比べて、加熱手段の加熱能力が比較的小さい場合や、加熱手段の起動時における能力の立ち上りが遅い場合に適用される。   In the hot water storage type hot water supply system, hot water boiling in advance by a heating means is stored in a hot water storage tank so that the hot water does not run out due to the hot water supply load, and hot water is supplied from the hot water storage tank. It is a system to do. The hot water storage type hot water supply system is applied when the heating capability of the heating means is relatively small as compared with an instantaneous hot water supply system or when the rise of the capability at the time of starting the heating means is slow.
貯湯式給湯システムは、湯栓からの湯の放出による給湯だけでなく、貯湯タンク内の高温水を用いて浴槽の冷めた湯や住居の床などを、熱交換によって加熱する熱交換器を備えたものがある。そのような貯湯式給湯システムとして、特許文献1には、熱交換器で熱交換を終えた中低温の戻り湯を貯湯タンクに戻す戻し配管が、貯湯タンクの高さ方向において複数に分岐して貯湯タンクに接続されている技術が開示されている。   The hot water storage hot water supply system is equipped with a heat exchanger that heats hot water that has been cooled in the bathtub or the floor of the house using hot water in the hot water storage tank as well as hot water by discharging hot water from the tap. There is something. As such a hot water storage-type hot water supply system, Patent Document 1 discloses that a return pipe for returning a low-temperature return hot water that has been subjected to heat exchange by a heat exchanger to a hot water storage tank is branched into a plurality in the height direction of the hot water storage tank. A technique connected to a hot water storage tank is disclosed.
また、特許文献2には、熱交換器で熱交換を終えた中低温の戻り湯を貯湯タンクに戻す戻し配管が、貯湯タンクの高さ方向において複数に分岐して貯湯タンクに接続されていて、戻り湯の温度を検出する温度検出手段を有し、当該温度検出手段の検出値に基づいて、貯湯タンクに戻す配管を選択切替させる技術が開示されている。   Further, in Patent Document 2, a return pipe for returning medium-low temperature return hot water that has been subjected to heat exchange by a heat exchanger to a hot water storage tank is branched into a plurality in the height direction of the hot water storage tank and connected to the hot water storage tank. A technique is disclosed that includes temperature detection means for detecting the temperature of the return hot water, and selectively switches the piping to be returned to the hot water storage tank based on the detection value of the temperature detection means.
特許第3888117号公報Japanese Patent No. 3888117 特許第4165594号公報Japanese Patent No. 4165594
特許文献1、2の何れも、熱交換器から戻る中低温の戻り湯を、貯湯タンク内の温度が戻り湯とほぼ同じになるような領域に戻すことを目的とした技術である。特許文献1、2のような技術では、貯湯タンクの3箇所以上に戻り湯の戻し口を設け、それぞれの戻し口に戻り湯の配管を接続するとともに、どの戻し口に戻り湯を戻すかを切り替えるための複数の流路切替弁を設ける必要があるため、構造が極めて複雑となり、高コスト化、大型化、重量増大という問題がある。また、中低温の戻り湯を貯湯タンク内の温度が戻り湯とほぼ同じになる領域に戻したとしても、そのような中低温の領域が結局利用されないままに貯湯タンク内に残る場合もあり、そのような場合には戻り湯の持つ熱量を再利用できず、省エネルギー化が図れないという問題もある。   Both Patent Documents 1 and 2 are techniques aimed at returning the medium and low temperature return hot water returning from the heat exchanger to a region where the temperature in the hot water storage tank is substantially the same as the return hot water. In technologies such as Patent Documents 1 and 2, return hot water return ports are provided at three or more locations in the hot water storage tank, and return hot water pipes are connected to the respective return ports, and which return port is used to return the return hot water. Since it is necessary to provide a plurality of flow path switching valves for switching, the structure becomes extremely complicated, and there are problems of high cost, large size, and weight increase. In addition, even if the medium and low temperature return hot water is returned to the region where the temperature in the hot water storage tank is almost the same as that of the return hot water, the medium low temperature region may remain in the hot water storage tank without being used. In such a case, there is a problem that the amount of heat of the return hot water cannot be reused and energy saving cannot be achieved.
本発明は、上述のような課題を解決するためになされたもので、熱交換器から貯湯タンクに戻る戻り湯が持つ熱量を簡単な構成で確実に再利用し、省エネルギー性能を改善することのできる貯湯式給湯システムを提供することを目的とする。   The present invention has been made to solve the above-described problems, and can reliably reuse the amount of heat of the returned hot water returned from the heat exchanger to the hot water storage tank with a simple configuration, thereby improving the energy saving performance. An object is to provide a hot water storage type hot water supply system.
本発明に係る貯湯式給湯システムは、水を加熱して高温水を生成可能な加熱手段と、温度境界層を介して、上側に高温水を貯留し、下側に低温水を貯留する貯湯タンクと、被加熱物を加熱するための熱交換器と、貯湯タンクから導出された高温水を熱交換器に送る移送手段と、貯湯タンクから導出された高温水を熱交換器に送って熱交換器により被加熱物を加熱する熱交換運転時に、熱交換器に送られた高温水が熱交換器を通過して温度低下した戻り湯を、温度境界層より上側の貯湯タンクの上方領域に流入させる上方戻し流路と、熱交換運転時に戻り湯を温度境界層より下側の貯湯タンクの下方領域に流入させる下方戻し流路と、戻り湯を上方戻し流路に流入させる状態と下方戻し流路に流入させる状態とに切り替え可能な流路切替手段と、熱交換運転時に流路切替手段を制御することにより戻り湯を上方戻し流路を介して貯湯タンク内に流入させるか下方戻し流路を介して貯湯タンク内に流入させるかを制御する制御手段とを備えたものである。   A hot water storage hot water supply system according to the present invention includes a heating means capable of heating water to generate high temperature water, and a hot water storage tank for storing high temperature water on an upper side and low temperature water on a lower side via a temperature boundary layer. A heat exchanger for heating the object to be heated, a transfer means for sending the high temperature water derived from the hot water storage tank to the heat exchanger, and a heat exchanger for sending the high temperature water derived from the hot water storage tank to the heat exchanger During the heat exchange operation that heats the object to be heated by the heat exchanger, the high temperature water sent to the heat exchanger passes through the heat exchanger and returns to the upper area of the hot water storage tank above the temperature boundary layer. An upper return flow path, a lower return flow path for allowing the return hot water to flow into the lower region of the hot water storage tank below the temperature boundary layer, and a state in which the return hot water flows into the upper return flow path and the lower return flow Flow path switching means capable of switching to a state of flowing into the path; Control means for controlling whether the return hot water flows into the hot water storage tank through the upper return flow path or the lower return flow path into the hot water storage tank by controlling the flow path switching means during heat exchange operation; It is equipped with.
本発明によれば、貯湯タンクから導出された高温水を熱交換器に送って被加熱物を加熱する熱交換運転時に熱交換器から貯湯タンクに戻る戻り湯を貯湯タンクの上方の高温領域に戻すことができる。このため、戻り湯が再利用されないまま貯湯タンク内に残ることを抑制することができ、戻り湯が持つ熱量を確実に再利用して、省エネルギー化が図れる。また、戻り湯を貯湯タンクの上方の高温領域に戻すことが不都合となる場合には、戻り湯を貯湯タンクの下方の低温領域に戻すことにより、そのような不都合を回避することができる。また、戻り湯の戻し口を貯湯タンクの上方と下方との2箇所に設けるだけでよく、3箇所以上の戻し口を設ける必要がないので、貯湯タンクの構造や配管構成の複雑化、戻り湯の流路を切り替える流路切替機構の複雑化を回避することができ、簡単な構成で上記効果を達成することができる。   According to the present invention, the hot water returned from the heat exchanger to the hot water storage tank during the heat exchange operation in which the high temperature water derived from the hot water storage tank is sent to the heat exchanger to heat the object to be heated is returned to the high temperature region above the hot water storage tank. Can be returned. For this reason, it can suppress that return hot water remains in a hot water storage tank, without being reused, and can recycle | reuse the heat quantity which return hot water has reliably, and can achieve energy saving. Further, when it is inconvenient to return the return hot water to the high temperature region above the hot water storage tank, such inconvenience can be avoided by returning the return hot water to the low temperature region below the hot water storage tank. Further, it is only necessary to provide return hot water return ports at two locations above and below the hot water storage tank, and it is not necessary to provide more than three return ports. The flow path switching mechanism for switching the flow paths can be prevented from becoming complicated, and the above effect can be achieved with a simple configuration.
本発明の実施の形態1の貯湯式給湯システムを示す構成図である。It is a block diagram which shows the hot water storage type hot-water supply system of Embodiment 1 of this invention. 本発明の実施の形態1の貯湯式給湯システムにおける信号の流れを表すブロック図である。It is a block diagram showing the flow of the signal in the hot water storage type hot-water supply system of Embodiment 1 of this invention. 流路切替弁を上方戻し流路側に切り替えた状態を示す図である。It is a figure which shows the state which switched the flow-path switching valve to the upper return flow path side. 流路切替弁を下方戻し流路側に切り替えた状態を示す図である。It is a figure which shows the state which switched the flow-path switching valve to the downward return flow path side. 本発明の実施の形態2の貯湯式給湯システムを示す構成図である。It is a block diagram which shows the hot water storage type hot-water supply system of Embodiment 2 of this invention. 本発明の実施の形態2の貯湯式給湯システムにおける信号の流れを表すブロック図である。It is a block diagram showing the flow of the signal in the hot water storage type hot-water supply system of Embodiment 2 of this invention. 追焚運転時に追焚戻り湯を上方戻し流路を介して上方戻し口から貯湯タンク内に戻したときの貯湯タンク内の温度分布の変化を説明するための図である。It is a figure for demonstrating the change of the temperature distribution in a hot water storage tank when a return hot water is returned in an hot water storage tank from an upper return port via an upper return flow path at the time of a chasing operation. 追焚戻り湯を上方戻し流路を介して貯湯タンク内に戻した場合の中温水取出口の位置の影響を説明するための図である。It is a figure for demonstrating the influence of the position of a middle temperature water extraction port at the time of returning a memorial return hot water in the hot water storage tank via an upper return flow path. 追焚運転時に追焚戻り湯を下方戻し流路を介して下方戻し口から貯湯タンク内に戻したときの貯湯タンク内の温度分布の変化を説明するための図である。It is a figure for demonstrating the change of the temperature distribution in a hot water storage tank when a return hot water is returned in a hot water storage tank from a lower return port via a downward return flow path at the time of a chasing operation. 追焚戻り湯を下方戻し流路を介して貯湯タンク内に戻した場合の中温水取出口の位置の影響を説明するための図である。It is a figure for demonstrating the influence of the position of a middle temperature water intake port at the time of returning a memorial return hot water in a hot water storage tank via a downward return flow path. 本発明の実施の形態3に係る制御動作を表すフローチャートである。It is a flowchart showing the control action which concerns on Embodiment 3 of this invention. 本発明の実施の形態3に係る制御動作を表すフローチャートである。It is a flowchart showing the control action which concerns on Embodiment 3 of this invention. 本発明の実施の形態3に係る制御動作を表すフローチャートである。It is a flowchart showing the control action which concerns on Embodiment 3 of this invention.
以下、図面を参照して本発明の実施の形態について説明する。なお、各図において共通する要素には、同一の符号を付して、重複する説明を省略する。   Embodiments of the present invention will be described below with reference to the drawings. In addition, the same code | symbol is attached | subjected to the element which is common in each figure, and the overlapping description is abbreviate | omitted.
実施の形態1.
≪機器構成≫
図1は、本発明の実施の形態1の貯湯式給湯システムを示す構成図である。図1に示すように、本実施の形態1における貯湯式給湯システムは、貯湯タンク1、加熱手段2、加熱用ポンプ31、追焚用ポンプ32、浴槽用ポンプ33、混合手段41、追焚熱交換器5、浴槽6、流路切替弁7、加熱用配管301、給水用配管302、導出用配管303、混合用配管304、給湯用配管305、浴槽往き配管306a、浴槽戻り配管306b、追焚往き配管307a、上方戻し流路307b、下方戻し流路307c、および制御手段100等を備えている。
Embodiment 1 FIG.
≪Device configuration≫
FIG. 1 is a configuration diagram showing a hot water storage type hot water supply system according to Embodiment 1 of the present invention. As shown in FIG. 1, the hot water storage type hot water supply system according to the first embodiment includes a hot water storage tank 1, a heating means 2, a heating pump 31, a remedy pump 32, a bathtub pump 33, a mixing means 41, and a remedy heat. Exchanger 5, bathtub 6, flow path switching valve 7, heating pipe 301, water supply pipe 302, outlet pipe 303, mixing pipe 304, hot water supply pipe 305, bathtub outlet pipe 306a, bathtub return pipe 306b, memory The forward piping 307a, the upper return flow path 307b, the lower return flow path 307c, the control means 100, etc. are provided.
貯湯タンク1は、加熱手段2により加熱された高温水を上側から貯留し、加熱前の低温水を下側から貯留する。貯湯タンク1内には、上側の高温水と、下側の低温水との間に、温度境界層が形成される。加熱手段2は、例えばヒートポンプにより水を加熱するように構成される。   The hot water storage tank 1 stores high-temperature water heated by the heating means 2 from the upper side, and stores low-temperature water before heating from the lower side. In the hot water storage tank 1, a temperature boundary layer is formed between the upper hot water and the lower hot water. The heating means 2 is configured to heat water by, for example, a heat pump.
混合手段41は、貯湯タンク1の上部から導出された高温水と、水道等の水源から供給される低温水(市水)とを混合することにより、給湯温度を調節する。浴槽6は、浴室に設置され、入浴用の40℃前後の湯が溜められる。追焚熱交換器5は、貯湯タンク1の上部から導出された高温水と、浴槽6から循環する浴槽水とを熱交換することにより、浴槽水を加熱する。   The mixing means 41 adjusts the hot water supply temperature by mixing high temperature water derived from the upper part of the hot water storage tank 1 with low temperature water (city water) supplied from a water source such as a water supply. The bathtub 6 is installed in a bathroom, and hot water at around 40 ° C. for bathing is stored. The memorial heat exchanger 5 heats the bath water by exchanging heat between the hot water derived from the upper part of the hot water storage tank 1 and the bath water circulating from the bath 6.
加熱用配管301は、加熱手段2を経由して、貯湯タンク1の下部と上部とを接続する。加熱用ポンプ31は、加熱用配管301の途中に配置される。給水用配管302は、貯湯タンク1の下部に接続され、水道等の水源から供給される低温水を貯湯タンク1内に導入する。導出用配管303は、貯湯タンク1の上部に接続され、貯湯タンク1内の高温水を導出する。混合用配管304は、給水用配管302から分岐し、混合手段41に低温水を導入する。給湯用配管305は、混合手段41にて混合された湯を、例えば蛇口、シャワー、浴槽6等の系外の負荷側に供給する。   The heating pipe 301 connects the lower part and the upper part of the hot water storage tank 1 via the heating means 2. The heating pump 31 is disposed in the middle of the heating pipe 301. The water supply pipe 302 is connected to the lower part of the hot water storage tank 1 and introduces low temperature water supplied from a water source such as a water supply into the hot water storage tank 1. The lead-out pipe 303 is connected to the upper part of the hot water storage tank 1 and guides the hot water in the hot water storage tank 1. The mixing pipe 304 branches off from the water supply pipe 302 and introduces low-temperature water into the mixing means 41. The hot water supply pipe 305 supplies the hot water mixed by the mixing means 41 to a load side outside the system such as a faucet, a shower, and the bathtub 6.
浴槽往き配管306aは、追焚熱交換器5と浴槽6とを接続する。浴槽戻り配管306bは、浴槽用ポンプ33を経由して、浴槽6と追焚熱交換器5とを接続する。追焚往き配管307aは、貯湯タンク1の上部から、追焚熱交換器5および追焚用ポンプ32を経由して、流路切替弁7に接続されている。本実施形態では、追焚往き配管307aおよび追焚用ポンプ32により、貯湯タンク1の上部から導出されて高温水を追焚熱交換器5に移送する移送手段が構成されている。   The bathtub going-out pipe 306 a connects the memory heat exchanger 5 and the bathtub 6. The bathtub return pipe 306 b connects the bathtub 6 and the memory heat exchanger 5 via the bathtub pump 33. The retrace piping 307a is connected from the upper part of the hot water storage tank 1 to the flow path switching valve 7 via the recuperation heat exchanger 5 and the remediation pump 32. In the present embodiment, a transfer means that is led out from the upper part of the hot water storage tank 1 and transfers high-temperature water to the tracking heat exchanger 5 is configured by the tracking forward piping 307 a and the tracking pump 32.
上方戻し流路307bは、流路切替弁7と、貯湯タンク1に設けられた上方戻し口11とを接続する。下方戻し流路307cは、流路切替弁7と、貯湯タンク1に設けられた下方戻し口12とを接続する。ここで、上方戻し流路307bの流路長は、下方戻し流路307cの流路長より短くなっている。貯湯タンク1の上部から導出されて追焚熱交換器5に送られた高温水は、追焚熱交換器5を通過する間に浴槽水に熱を与え、温度低下する。この温度低下した温水(以下、「追焚戻り湯」と称する)は、上方戻し流路307bまたは下方戻し流路307cを通って、貯湯タンク1内に戻される。流路切替弁7は、追焚戻り湯を、上方戻し流路307bに流入させる状態と、下方戻し流路307cに流入させる状態とに切り替え可能になっている。流路切替弁7は、更に、追焚戻り湯を上方戻し流路307bと下方戻し流路307cとに分配し、その分配比(流量比)を変化させることができるように構成されていてもよい。   The upper return flow path 307 b connects the flow path switching valve 7 and the upper return port 11 provided in the hot water storage tank 1. The lower return flow path 307 c connects the flow path switching valve 7 and the lower return port 12 provided in the hot water storage tank 1. Here, the channel length of the upper return channel 307b is shorter than the channel length of the lower return channel 307c. The high-temperature water led out from the upper part of the hot water storage tank 1 and sent to the memory heat exchanger 5 gives heat to the bath water while passing through the memory heat exchanger 5, and the temperature drops. The temperature-decreased warm water (hereinafter referred to as “return hot water”) is returned to the hot water storage tank 1 through the upper return flow path 307b or the lower return flow path 307c. The flow path switching valve 7 can be switched between a state in which the memorial return hot water flows into the upper return flow path 307b and a state in which the hot water returns to the lower return flow path 307c. Even if the flow path switching valve 7 is further configured to distribute the memorial return hot water to the upper return flow path 307b and the lower return flow path 307c, the distribution ratio (flow rate ratio) can be changed. Good.
制御手段100は、加熱手段2、加熱用ポンプ31、追焚用ポンプ32、浴槽用ポンプ33、混合手段41、および流路切替弁7の動作を制御する。また、貯湯タンク1には、高さ方向に間隔をおいて、貯湯温度センサ501a〜501fが設けられている。図示の構成では、貯湯温度センサ501a〜501fの個数を6個としているが、この個数はこれに限定されるものではなく、貯湯タンク1の内部の温度分布をより高精度に測定するのに充分な数の温度センサを設けるようにしてもよい。   The control unit 100 controls operations of the heating unit 2, the heating pump 31, the memory pump 32, the bathtub pump 33, the mixing unit 41, and the flow path switching valve 7. The hot water storage tank 1 is provided with hot water storage temperature sensors 501a to 501f at intervals in the height direction. In the illustrated configuration, the number of hot water storage temperature sensors 501a to 501f is six, but this number is not limited to this, and is sufficient to measure the temperature distribution inside the hot water storage tank 1 with higher accuracy. Any number of temperature sensors may be provided.
加熱用配管301には、加熱手段2の下流側にて加熱後の高温水の温度を検出するための沸上温度センサ502が設けられている。給水用配管302には、給水温度を検出するための給水温度センサ504が設けられている。貯湯タンク1の上部には、貯湯タンク1から導出される高温水の温度を検出するための導出温度センサ503が設けられている。給湯用配管305には、負荷側で使用される湯温を検出するための給湯温度センサ505が設けられている。浴槽戻り配管306bには、浴槽6から追焚熱交換器5に流れ込む浴槽戻り湯温度を検出するための浴槽戻り湯温度センサ506が設けられている。なお、浴槽戻り湯温度センサ506は、定期的に浴槽用ポンプ33を運転させることにより、浴槽温度を検出する手段として利用してもよい。給湯用配管305には、負荷側で使用される湯量を検出する給湯流量センサ601が設けられている。   The heating pipe 301 is provided with a boiling temperature sensor 502 for detecting the temperature of the high-temperature water after heating on the downstream side of the heating means 2. The feed water pipe 302 is provided with a feed water temperature sensor 504 for detecting the feed water temperature. A derived temperature sensor 503 for detecting the temperature of the high-temperature water derived from the hot water storage tank 1 is provided at the upper part of the hot water storage tank 1. The hot water supply pipe 305 is provided with a hot water supply temperature sensor 505 for detecting the hot water temperature used on the load side. The bathtub return pipe 306b is provided with a bathtub return hot water temperature sensor 506 for detecting the temperature of the bathtub return hot water flowing from the bathtub 6 into the memorial heat exchanger 5. The bathtub return hot water temperature sensor 506 may be used as means for detecting the bathtub temperature by operating the bathtub pump 33 periodically. The hot water supply pipe 305 is provided with a hot water supply flow rate sensor 601 for detecting the amount of hot water used on the load side.
追焚熱交換器5の下流側には、追焚戻り湯の温度を検出する追焚戻り湯温度センサ507が設置されている。なお、追焚戻り湯温度をセンサで直接検出する方法に代えて、追焚用ポンプ32の回転数、浴槽用ポンプ33の回転数、貯湯タンク1から導出される高温水の温度、浴槽戻り湯温度等から追焚戻り湯温度を推定してもよい。   On the downstream side of the remedy heat exchanger 5, a remedy return hot water temperature sensor 507 for detecting the temperature of the remedy return hot water is installed. Instead of the method of directly detecting the temperature of the return hot water with a sensor, the rotational speed of the hot water pump 32, the rotational speed of the bathtub pump 33, the temperature of the hot water derived from the hot water storage tank 1, the bathtub return hot water, The memorial return hot water temperature may be estimated from the temperature or the like.
追焚運転が行われる時間帯は、通常は夜間であり、浴槽6への湯張りを含め、一日の給湯負荷の過半は終了している。すなわち、貯湯タンク1内の高温水の過半は消費されている。このため、追焚運転が行われる場合に、貯湯タンク1内の上方の高温領域と下方の低温領域との間にある温度境界層は、貯湯タンク1の高さの中間付近の所定範囲内に存在する。上方戻し流路307bが接続される上方戻し口11は、追焚運転が行われるときの温度境界層の位置より上側となる貯湯タンク1の上方領域に設けられている。このため、上方戻し流路307bを通って貯湯タンク1内に戻る追焚戻り湯は、追焚戻り湯より温度の高い貯湯タンク1内の高温領域に流入する。下方戻し流路307cが接続される下方戻し口12は、追焚運転が行われるときの温度境界層の位置より下側となる貯湯タンク1の下方領域に設けられている。このため、下方戻し流路307cを通って貯湯タンク1内に戻る追焚戻り湯は、追焚戻り湯より温度の低い貯湯タンク1内の低温領域に流入する。   The time zone in which the memorial operation is performed is usually at night, and the majority of the hot water supply load for one day including the filling of the bathtub 6 is completed. That is, a majority of the high-temperature water in the hot water storage tank 1 is consumed. For this reason, when the chasing operation is performed, the temperature boundary layer between the upper high temperature region and the lower low temperature region in the hot water storage tank 1 is within a predetermined range near the middle of the hot water storage tank 1 height. Exists. The upper return port 11 to which the upper return flow path 307b is connected is provided in the upper region of the hot water storage tank 1 that is above the position of the temperature boundary layer when the chasing operation is performed. For this reason, the retrace hot water which returns to the hot water storage tank 1 through the upper return flow path 307b flows into the high temperature region in the hot water storage tank 1 having a temperature higher than that of the retrace hot water. The lower return port 12 to which the lower return flow path 307c is connected is provided in a lower region of the hot water storage tank 1 that is below the position of the temperature boundary layer when the chasing operation is performed. For this reason, the reclaimed hot water returning to the hot water storage tank 1 through the lower return flow path 307c flows into the low temperature region in the hot water storage tank 1 having a temperature lower than that of the regenerative hot water.
図2は、本発明の実施の形態1の貯湯式給湯システムにおける信号の流れを表すブロック図である。図2に示すように、制御手段100は、追焚有効蓄熱量算出手段101、追焚必要熱量予測手段104、加熱制御手段105、流路切替弁制御手段106、浴槽目標温度設定手段107、ポンプ制御手段108、システムモード設定手段109および追焚モード設定手段110等を有している。   FIG. 2 is a block diagram showing a signal flow in the hot water storage type hot water supply system according to Embodiment 1 of the present invention. As shown in FIG. 2, the control means 100 includes a tracking effective heat storage amount calculation means 101, a tracking required heat amount prediction means 104, a heating control means 105, a flow path switching valve control means 106, a bath target temperature setting means 107, a pump A control unit 108, a system mode setting unit 109, a memorial mode setting unit 110, and the like are included.
制御手段100には、時刻検出手段であるタイマー、貯湯温度センサ501a〜501f、沸上温度センサ502、導出温度センサ503、給水温度センサ504、給湯温度センサ505、浴槽戻り湯温度センサ506、追焚戻り湯温度センサ507および給湯流量センサ601からの情報が入力される。この制御手段100は、入力されたこれらの情報に基づいて、加熱手段2、加熱用ポンプ31、追焚用ポンプ32、浴槽用ポンプ33、混合手段4、流路切替弁7を制御する。   The control means 100 includes a timer that is time detection means, hot water storage temperature sensors 501a to 501f, a boiling temperature sensor 502, a derivation temperature sensor 503, a feed water temperature sensor 504, a hot water supply temperature sensor 505, a bathtub return hot water temperature sensor 506, a memorial service. Information from the return hot water temperature sensor 507 and the hot water supply flow rate sensor 601 is input. The control means 100 controls the heating means 2, the heating pump 31, the remedy pump 32, the bathtub pump 33, the mixing means 4, and the flow path switching valve 7 based on the input information.
浴槽目標温度設定手段107は、例えば浴室や台所に設置されるリモコン装置等のユーザーインターフェース装置に入力される使用者の指示に基づいて、追焚運転によって浴槽6を昇温する際の目標温度(以下、「浴槽目標温度」と称する)を設定する。   The bathtub target temperature setting means 107 is a target temperature (when the temperature of the bathtub 6 is raised by a memorial operation based on a user instruction input to a user interface device such as a remote controller installed in a bathroom or kitchen, for example. Hereinafter, this is referred to as “bath target temperature”.
追焚有効蓄熱量算出手段101は、浴槽目標温度設定手段107で設定された浴槽目標温度と、貯湯温度センサ501a〜501fにより検出された情報とに基づいて、貯湯タンク1内の湯の有する蓄熱量のうちで浴槽6の追焚に利用可能な蓄熱量(以下、「追焚有効蓄熱量」と称する)を算出する。   The memorial effective heat storage amount calculation means 101 stores the heat stored in the hot water in the hot water storage tank 1 based on the bath target temperature set by the bath target temperature setting means 107 and the information detected by the hot water storage temperature sensors 501a to 501f. Of the amount, the amount of heat storage that can be used for the remedy of the bathtub 6 (hereinafter referred to as “the remedy effective heat storage amount”) is calculated.
追焚必要熱量予測手段104は、使用者の過去の追焚使用実績、または現在の浴槽6の温度や湯量の状況あるいはその両方の情報に基づいて、浴槽6の追焚に必要な熱量(以下、「追焚必要熱量」と称する)を予測する。   The required heat amount prediction means 104 calculates the amount of heat (hereinafter referred to as the amount of heat necessary for the bath 6) based on the past use record of the user, the current temperature of the bath 6, the amount of hot water, or both. , Referred to as “required heat amount”).
加熱制御手段105は、追焚有効蓄熱量算出手段101により算出された追焚有効蓄熱量と、追焚必要熱量予測手段104により予測された追焚必要熱量とに基づいて、加熱手段2および加熱用ポンプ31の起動の必要性を判定する。   The heating control unit 105 includes the heating unit 2 and the heating unit based on the tracking effective heat storage amount calculated by the tracking effective heat storage amount calculating unit 101 and the tracking required heat amount predicted by the tracking required heat amount prediction unit 104. The necessity for starting the pump 31 is determined.
流路切替弁制御手段106は、流路切替弁7を動作させるパルスモータのパルス数を調節することにより、上方戻し流路307bと下方戻し流路307cとの流量分配を制御する。例えば、図3に示すように、流路切替弁7の開度を上方戻し流路307bの側に全開にした場合、追焚戻り湯はその全量が上方戻し口11から貯湯タンク1内に流入する。逆に、図4に示すように、流路切替弁7の開度を下方戻し流路307cの側に全開にした場合、追焚戻り湯はその全量が下方戻し口12から貯湯タンク1内に流入する。流路切替弁7の制御は、図3あるいは図4に示す制御に限るものではなく、追焚戻り湯の一部を上方戻し流路307bから貯湯タンク1に戻し、残りを下方戻し流路307cから貯湯タンク1に戻すように制御してもよい。   The flow path switching valve control means 106 controls the flow distribution between the upper return flow path 307b and the lower return flow path 307c by adjusting the number of pulses of the pulse motor that operates the flow path switching valve 7. For example, as shown in FIG. 3, when the opening of the flow path switching valve 7 is fully opened to the upper return flow path 307 b, the total amount of the memorial return hot water flows into the hot water storage tank 1 from the upper return port 11. To do. Conversely, as shown in FIG. 4, when the opening of the flow path switching valve 7 is fully opened to the lower return flow path 307 c, the total amount of the memorial return hot water enters the hot water storage tank 1 from the lower return port 12. Inflow. The control of the flow path switching valve 7 is not limited to the control shown in FIG. 3 or FIG. 4, but a part of the memorial return hot water is returned from the upper return flow path 307b to the hot water storage tank 1, and the rest is returned to the lower return flow path 307c. It may be controlled to return to the hot water storage tank 1.
ポンプ制御手段108は、加熱用ポンプ31、追焚用ポンプ32および浴槽用ポンプ33の各々の回転数を制御し、ポンプ循環量を調節する。   The pump control means 108 controls the rotational speed of each of the heating pump 31, the memorial pump 32, and the bathtub pump 33, and adjusts the pump circulation amount.
システムモード設定手段109は、ユーザーインターフェース装置に入力される使用者の指示などに基づいて、システム全体の省エネルギーを優先する運転モード(以下、「省エネモード」と称する)、この省エネモードと比べて湯切れの回避を優先する運転モード(以下、「湯切れ回避モード」と称する)、急速に追焚する追焚能力の保持を優先する運転モード(以下、「追焚能力優先モード」と称する)などを設定する。   The system mode setting means 109 is an operation mode giving priority to energy saving of the entire system (hereinafter referred to as “energy saving mode”) based on a user's instruction or the like input to the user interface device. Operation mode giving priority to avoiding cutting (hereinafter, referred to as “hot water avoidance mode”), operation mode giving priority to maintaining a chasing ability that is quickly pursued (hereinafter, referred to as “memoriing ability priority mode”), etc. Set.
追焚モード設定手段110は、ユーザーインターフェース装置に入力される使用者の指示などに基づいて、浴槽6の追焚運転に関する運転モードを設定する。例えば、追焚モード設定手段110は、浴槽温度を所定の範囲内に自動で維持する自動保温モード、中低温まで冷めた浴槽温度を一括して浴槽目標温度まで昇温する一括追焚モード、短時間で追焚を完了するために追焚能力(単位時間当たりの浴槽加熱量)を最優先して追焚を行う高能力追焚モードなどから選択する形で設定する。   The memorial mode setting means 110 sets an operation mode related to the chasing operation of the bathtub 6 based on a user instruction or the like input to the user interface device. For example, the remedy mode setting means 110 includes an automatic heat retention mode for automatically maintaining the bath temperature within a predetermined range, a collective remedy mode for collectively raising the bath temperature cooled to a medium to low temperature to the bath target temperature, In order to complete the remembrance in time, the remedy ability (bath heating amount per unit time) is set in the form of selecting from a high-capacity remedy mode in which remedy is performed with the highest priority.
図3および図4に示すように、追焚往き配管307aは追焚往き配管断熱材8aにより覆われ、上方戻し流路307bは上方戻し流路断熱材8bにより覆われ、下方戻し流路307cは下方戻し流路断熱材8cにより覆われている。上方戻し流路断熱材8bは、下方戻し流路断熱材8cよりも断熱性能が高いものであることが好ましい。上方戻し流路断熱材8bの断熱性能を、下方戻し流路断熱材8cの断熱性能より高くする方法としては、上方戻し流路断熱材8bの厚さを下方戻し流路断熱材8cの厚さより厚くする方法や、あるいは、上方戻し流路断熱材8bを下方戻し流路断熱材8cよりも熱伝導率の低い高性能な断熱材(例えば真空断熱材)で構成する方法が挙げられる。あるいは、下方戻し流路断熱材8cは、省略しても良い。   As shown in FIG. 3 and FIG. 4, the tracking return pipe 307a is covered with the tracking return pipe heat insulating material 8a, the upper return flow path 307b is covered with the upper return flow path heat insulating material 8b, and the lower return flow path 307c is The lower return flow path heat insulating material 8c is covered. It is preferable that the upper return flow path heat insulating material 8b has higher heat insulating performance than the lower return flow path heat insulating material 8c. As a method for making the heat insulation performance of the upper return flow path heat insulating material 8b higher than the heat insulation performance of the lower return flow path heat insulating material 8c, the thickness of the upper return flow path heat insulating material 8b is made larger than the thickness of the lower return flow path heat insulating material 8c. A method of increasing the thickness, or a method of configuring the upper return flow path heat insulating material 8b with a high performance heat insulating material (for example, a vacuum heat insulating material) having a lower thermal conductivity than the lower return flow path heat insulating material 8c. Alternatively, the lower return flow path heat insulating material 8c may be omitted.
次に、本実施の形態1における貯湯式給湯システムの動作について説明する。
≪基本的な動作≫
貯湯タンク1の下部には、給水用配管302を通じて低温水が流入し、貯留される。加熱手段2によって貯湯タンク1の沸き上げを行う際には、貯湯タンク1の下部に貯留された低温水が、加熱用ポンプ31によって加熱用配管301に引き込まれ、加熱手段2に導かれる。加熱手段2は、導かれた低温水を加熱して、高温水に沸き上げる。沸き上げられた高温水は、加熱用配管301を通じて貯湯タンク1に上部から流入し、貯留される。
Next, the operation of the hot water storage type hot water supply system in the first embodiment will be described.
≪Basic operation≫
Low temperature water flows into the lower part of the hot water storage tank 1 through the water supply pipe 302 and is stored. When the hot water storage tank 1 is boiled by the heating means 2, the low temperature water stored in the lower part of the hot water storage tank 1 is drawn into the heating pipe 301 by the heating pump 31 and guided to the heating means 2. The heating means 2 heats the led low-temperature water and boils it into high-temperature water. The boiled high-temperature water flows into the hot water storage tank 1 through the heating pipe 301 and is stored.
負荷側に湯を供給する際には、貯湯タンク1の上部から高温水が導出用配管303により導出され、混合手段4に導かれる。このとき、貯湯タンク1の上部から導出された高温水と同量の低温水が給水用配管302から貯湯タンク1の下部に流入する。混合手段4は、混合用配管304から供給される低温水と、貯湯タンク1から供給される高温水とを混合し、給湯用配管305を通じて、蛇口、シャワー、浴槽6などに供給する。   When hot water is supplied to the load side, high-temperature water is led out from the upper part of the hot water storage tank 1 through the lead-out pipe 303 and led to the mixing means 4. At this time, the same amount of low-temperature water as the high-temperature water derived from the upper part of the hot water storage tank 1 flows into the lower part of the hot water storage tank 1 from the water supply pipe 302. The mixing means 4 mixes the low temperature water supplied from the mixing pipe 304 and the high temperature water supplied from the hot water storage tank 1 and supplies the mixed water to the faucet, shower, bathtub 6 and the like through the hot water supply pipe 305.
また、浴槽6の追焚運転(熱交換運転)を行う際には、追焚用ポンプ32および浴槽用ポンプ33が駆動される。これにより、貯湯タンク1の上部から高温水が追焚往き配管307aにより導出され、追焚熱交換器5に導かれる。同時に、浴槽6内の浴槽水は、浴槽戻り配管306bを通って、追焚熱交換器5に導かれる。追焚熱交換器5で浴槽水へ熱を与えて温度の低下した追焚戻り湯は、上方戻し流路307bまたは下方戻し流路307cを通って貯湯タンク1内に戻る。追焚熱交換器5で熱を受け取って温度の上昇した浴槽水は、浴槽往き配管306aを通って浴槽6に戻る。このような追焚運転は、ユーザーインターフェース装置に入力される使用者の指示により強制的に開始されるか、あるいは、浴槽戻り湯温度センサ506によって定期的に検出される浴槽温度が浴槽目標温度設定手段107により設定された浴槽目標温度よりも所定量以上低くなったときに自動的に開始される。その後、ユーザーインターフェース装置に入力される使用者の指示により強制的に追焚運転が終了されるか、あるいは、浴槽戻り湯温度センサ506によって検出される浴槽温度が上記浴槽目標温度よりも所定量以上高くなったときに自動的に追焚運転が終了する。   In addition, when performing the chasing operation (heat exchanging operation) of the bathtub 6, the chasing pump 32 and the bathtub pump 33 are driven. Thereby, high temperature water is led out from the upper part of the hot water storage tank 1 by the follow-up piping 307 a and led to the follow-up heat exchanger 5. At the same time, the bathtub water in the bathtub 6 is guided to the memory heat exchanger 5 through the bathtub return pipe 306b. The reclaimed hot water whose temperature has dropped due to heat applied to the bath water in the recuperation heat exchanger 5 returns to the hot water storage tank 1 through the upper return flow path 307b or the lower return flow path 307c. Bath water whose temperature has risen due to receiving heat in the memory heat exchanger 5 returns to the bathtub 6 through the bathtub outlet pipe 306a. Such a memorial operation is forcibly started by a user's instruction input to the user interface device, or the bath temperature periodically detected by the bath return hot water temperature sensor 506 is the bath target temperature setting. It is automatically started when the temperature becomes a predetermined amount or more lower than the bathtub target temperature set by the means 107. Thereafter, the chasing operation is forcibly terminated by a user instruction input to the user interface device, or the bath temperature detected by the bath return hot water temperature sensor 506 is a predetermined amount or more than the bath target temperature. The memorial operation is automatically terminated when it becomes higher.
本実施形態の貯湯式給湯システムでは、追焚運転時に、流路切替弁7を制御することにより、追焚戻り湯を、上方戻し流路307bを介して貯湯タンク1に戻すか、下方戻し流路307cを介して貯湯タンク1に戻すかを、以下に説明する事項に基づいて制御する。なお、以下の説明では、追焚戻り湯を貯湯タンク1に戻す際に、追焚戻り湯の全量を上方戻し流路307bに流入させること、あるいは、上方戻し流路307bの流量を下方戻し流路307cの流量より大きくすることを「タンク上方に戻す」と略称し、追焚戻り湯の全量を下方戻し流路307cに流入させること、あるいは、下方戻し流路307cの流量を上方戻し流路307bの流量より大きくすることを「タンク下方に戻す」と略称する。   In the hot water storage type hot water supply system of the present embodiment, during the chasing operation, by controlling the flow path switching valve 7, the chasing return hot water is returned to the hot water storage tank 1 via the upper return flow path 307b or the lower return flow. Whether to return to the hot water storage tank 1 via the path 307c is controlled based on the items described below. In the following description, when returning the remedy return hot water to the hot water storage tank 1, the total amount of the remedy return hot water is caused to flow into the upper return flow path 307b, or the flow rate of the upper return flow path 307b is changed to the lower return flow. Making the flow rate larger than the flow rate of the passage 307c is abbreviated as “returning to the upper side of the tank”, and the entire amount of the memorial return hot water is allowed to flow into the lower return flow passage 307c, or the flow rate of the lower return flow passage 307c is increased to Making it larger than the flow rate of 307b is abbreviated as “returning to the bottom of the tank”.
追焚戻り湯の温度は、使用状況によって異なるが、少なくとも給水温度(低温水の温度)よりは高いので、追焚戻り湯は熱量を有している。追焚戻り湯をタンク上方に戻した場合には、追焚戻り湯の熱量が貯湯タンク1の上方の高温領域に戻るので、追焚戻り湯の熱量を給湯に確実に再利用できる。これに対し、追焚戻り湯をタンク下方に戻した場合には、給湯に利用されない貯湯タンク1の下方の低温領域に追焚戻り湯が混合するので、追焚戻り湯の熱量を再利用できない。このため、省エネルギーの観点からは、追焚戻り湯をなるべくタンク上方に戻した方が、省エネルギー化が図れる。ただし、追焚戻り湯の流入によって貯湯タンク1の上方の高温領域の温度が給湯に使用可能な温度(例えば40℃)未満に低下してしまうような場合には、すべての熱量が無効となってしまうので、追焚戻り湯をタンク上方に戻すべきでない。貯湯タンク1の上方の高温領域が十分に高温である場合や、この高温領域の湯量が十分に多量である場合には、そのようなおそれがないので、追焚戻り湯をタンク上方に戻すように制御することが省エネルギーの観点から望ましい。   Although the temperature of the remedy return hot water varies depending on the use situation, the remedy return hot water has a calorific value because it is at least higher than the water supply temperature (temperature of the low temperature water). When the remedy return hot water is returned to the upper side of the tank, the heat amount of the remedy return hot water returns to the high temperature region above the hot water storage tank 1, so that the heat quantity of the remedy return hot water can be reliably reused for hot water supply. On the other hand, when the return hot water is returned to the lower side of the tank, the return hot water is mixed with a low temperature region below the hot water storage tank 1 that is not used for hot water supply. . For this reason, from the viewpoint of energy saving, it is possible to save energy by returning the remedy return hot water to the upper side of the tank as much as possible. However, if the temperature of the high temperature region above the hot water storage tank 1 falls below the temperature that can be used for hot water supply (for example, 40 ° C.) due to the inflow of the memorial return hot water, all the amount of heat becomes invalid. The memorial return hot water should not be returned to the upper part of the tank. When the high temperature region above the hot water storage tank 1 is sufficiently high, or when the amount of hot water in this high temperature region is sufficiently large, there is no such a possibility. It is desirable from the viewpoint of energy saving.
追焚湯切れへの耐力に関しては、追焚戻り湯の温度が浴槽目標温度と比べて高いか低いかにより、追焚戻り湯をタンク上方に戻した方が良いかタンク下方に戻した方が良いかが異なる。追焚戻り湯の温度が浴槽目標温度より高い場合には、追焚戻り湯は、浴槽水を加熱可能な熱量を有しているので、追焚戻り湯をタンク上方に戻すことにより、貯湯タンク1の上方の高温領域が有する追焚に有効な熱量が増え、追焚湯切れへの耐力が高くなる。これに対し、追焚戻り湯の温度が浴槽目標温度より低い場合には、追焚戻り湯は浴槽水に対して負の熱量を有しているので、追焚戻り湯をタンク上方に戻すと、貯湯タンク1の上方の高温領域が有する追焚に有効な熱量が減少する。このため、追焚戻り湯の温度が浴槽目標温度より低い場合には、追焚戻り湯をタンク下方に戻した方が追焚湯切れへの耐力が高くなる。   With regard to the resistance to running out of hot water, it is better to return the hot water to the upper side of the tank or lower the tank depending on whether the temperature of the hot water is higher or lower than the bath target temperature. Good is different. When the temperature of the return hot water is higher than the bath target temperature, the return hot water has a quantity of heat that can heat the bathtub water. The amount of heat effective for the chasing of the high temperature region above 1 is increased, and the resistance to running out of the chasing hot water is increased. On the other hand, when the temperature of the remembrance return water is lower than the bath target temperature, the remembrance return hot water has a negative amount of heat with respect to the tub water. The amount of heat that is effective for the chasing of the high temperature region above the hot water storage tank 1 is reduced. For this reason, when the temperature of the remembrance return hot water is lower than the bath tub target temperature, the proof strength of the remedy return hot water is higher when the remedy return hot water is returned to the lower side of the tank.
追焚能力の観点からは、次のようになる。追焚戻り湯の温度は、貯湯タンク1の上方の高温領域の温度より低いので、追焚戻り湯をタンク上方に戻すと、貯湯タンク1の上方の高温領域の温度は低下する。貯湯タンク1の上方の高温領域の温度が高いほど、追焚能力は高くなる。このため、追焚能力に関しては、追焚戻り湯の温度にかかわらず、追焚戻り湯をタンク下方に戻した方が、追焚能力を高く維持することができる。   From the viewpoint of memorial ability, it is as follows. Since the temperature of the remedy return hot water is lower than the temperature in the high temperature region above the hot water storage tank 1, when the remedy return hot water is returned to the upper side of the tank, the temperature in the high temperature region above the hot water storage tank 1 decreases. The higher the temperature in the high temperature region above the hot water storage tank 1, the higher the memorial ability. For this reason, regarding the memorial ability, regardless of the temperature of the memorial return hot water, the memorial ability can be maintained higher when the memorial return hot water is returned to the lower side of the tank.
以上説明したように、本実施形態の貯湯式給湯システムによれば、追焚戻り湯をタンク上方に戻した場合、追焚戻り湯が貯湯タンク1の上方の高温領域に混合されるので、追焚戻り湯が持つ熱量を確実に再利用することができる。これに対し、追焚戻り湯を貯湯タンク1の中間部に戻す構成の場合には、貯湯タンク1の中間部に戻された追焚戻り湯が結局使用されないまま残る場合がある。本実施形態の貯湯式給湯システムによれば、追焚戻り湯をタンク上方に戻した場合、追焚戻り湯が持つ熱量を確実に再利用することができるので、確実に省エネルギー化が図れる。また、追焚戻り湯をタンク上方に戻すことがシステムの状態や使用者の意向との兼ね合いで不都合となる場合には、追焚戻り湯をタンク下方に戻すことができるので、そのような不都合を回避することができる。更に、本実施形態の貯湯式給湯システムでは、貯湯タンク1に追焚戻り湯の戻し口として上方戻し口11と下方戻し口12との2箇所を設けるだけでよく、3箇所以上の戻し口を設ける必要がない。このため、貯湯タンク1の構造や追焚戻り湯の流路構成の複雑化を回避することができるので、装置の大型化やコスト・重量の増大を招くことなく、省エネルギー化を達成することができる。   As described above, according to the hot water storage type hot water supply system of the present embodiment, when the return hot water is returned to the upper side of the tank, the additional hot water is mixed in the high temperature region above the hot water storage tank 1. The amount of heat that can be reused is ensured. On the other hand, in the case of a configuration in which the remedy return hot water is returned to the intermediate portion of the hot water storage tank 1, the remedy return hot water returned to the intermediate portion of the hot water storage tank 1 may remain unused after all. According to the hot water storage type hot water supply system of the present embodiment, when the remedy return hot water is returned to the upper side of the tank, the amount of heat of the remedy return hot water can be surely reused, so that energy saving can be ensured. Further, when it is inconvenient to return the remedy return hot water to the upper side of the tank in consideration of the state of the system and the intention of the user, the remedy return hot water can be returned to the lower side of the tank. Can be avoided. Furthermore, in the hot water storage type hot water supply system of the present embodiment, the hot water storage tank 1 only needs to be provided with two places, that is, the upper return port 11 and the lower return port 12 as return ports for the memorial return hot water. There is no need to provide it. For this reason, since it is possible to avoid complication of the structure of the hot water storage tank 1 and the flow path configuration of the reclaimed hot water, it is possible to achieve energy saving without increasing the size of the apparatus and increasing the cost and weight. it can.
本実施形態では、上述した理由から、追焚き戻り湯の温度が浴槽目標温度より高ければタンク上方に戻し、そうでなければタンク下方に戻すように制御してもよい。また、本実施形態では、システムモード設定手段109で省エネモードが設定されている場合には、追焚戻り湯をその温度にかかわらずタンク上方に戻すように制御してもよい。これにより、追焚戻り湯の熱量をより確実に回収して再利用できるので、使用者の意向に従い、省エネルギーを最優先することができる。また、本実施形態では、システムモード設定手段109で追焚能力優先モードが設定されている場合には、追焚戻り湯をその温度にかかわらずタンク下方に戻すように制御してもよい。これにより、貯湯タンク1の上方の高温領域の温度を最大化することができるので、使用者の意向に従い、追焚能力の保持を最優先することができる。   In the present embodiment, for the reason described above, control may be performed such that if the temperature of the reclaimed hot water is higher than the bath target temperature, it is returned to the upper side of the tank, and if not, it is returned to the lower side of the tank. Further, in the present embodiment, when the energy saving mode is set by the system mode setting means 109, control may be performed so that the remedy return hot water is returned to the upper side of the tank regardless of the temperature. Thereby, since the calorie | heat amount of memorial return hot water can be collect | recovered more reliably and can be reused, according to a user's intention, energy saving can be given top priority. Further, in this embodiment, when the remedy capability priority mode is set by the system mode setting means 109, the remedy return hot water may be controlled to return to the lower side of the tank regardless of the temperature. Thereby, since the temperature of the high temperature area | region above the hot water storage tank 1 can be maximized, according to a user's intention, retention of memorial ability can be given top priority.
また、本実施形態では、追焚モード設定手段110で自動保温モードが設定されている場合に、自動保温の設定時間が長ければ追焚戻り湯をタンク下方に戻し、自動保温の設定時間が短ければ追焚戻り湯をタンク上方に戻すように制御してもよい。ここで、設定時間ではなく自動保温運転の残り時間に基づいてもよい。また、貯湯タンク1内の所定温度(例えば40℃)以上の蓄熱量が、所定量(例えば予測される追焚必要熱量に所定の余裕代を加えた量)以上の場合であり、高温領域の温度が所定温度を下回らないと判断されるときに、追焚戻り湯をタンク上方に戻すように制御してもよい。   Further, in the present embodiment, when the automatic warming mode is set by the chasing mode setting means 110, if the setting time of the automatic warming is long, the chasing return hot water is returned to the lower side of the tank, and the setting time of the automatic warming is shortened. For example, it may be controlled to return the memorial return hot water to the upper side of the tank. Here, it may be based not on the set time but on the remaining time of the automatic heat insulation operation. In addition, the amount of heat stored in the hot water storage tank 1 equal to or higher than a predetermined temperature (for example, 40 ° C.) is equal to or higher than a predetermined amount (for example, an amount obtained by adding a predetermined margin to the predicted amount of heat required for replenishment). When it is determined that the temperature does not fall below the predetermined temperature, control may be performed so that the reclaimed hot water is returned to the upper side of the tank.
また、本実施の形態1においては、上方戻し流路断熱材8bを、下方戻し流路断熱材8cよりも断熱性能が高いものとすることにより、以下のような利点がある。上方戻し流路307bを介して追焚戻り湯を貯湯タンク1内に戻す場合には、追焚戻り湯が貯湯タンク1の上方の高温領域に流入し、高温領域の温度が低下する。貯湯タンク1の上方の高温領域の温度が目標給湯温度より低くなると、目標給湯温度の湯を供給できなくなるため、貯湯タンク1の上方の高温領域の温度低下はなるべく抑制する必要があり、そのためには上方戻し流路307bを通る追焚戻り湯の温度を可能な限り保温することが望まれる。特に、追焚運転の停止中に上方戻し流路307b内に滞留した追焚戻り湯の温度が大きく低下すると、次の追焚運転の開始時に、その温度低下した上方戻し流路307b内の追焚戻り湯が貯湯タンク1の上方の高温領域に流入することになり、好ましくない。このようなことから、上方戻し流路307bを保温する上方戻し流路断熱材8bの断熱性能をなるべく高くすることにより、貯湯タンク1の上方の高温領域の温度低下を抑制し、省エネルギー性を高めることができる。   In the first embodiment, the upper return flow path heat insulating material 8b has higher heat insulation performance than the lower return flow path heat insulating material 8c, thereby providing the following advantages. In the case where the return hot water is returned into the hot water storage tank 1 through the upper return flow path 307b, the hot return hot water flows into the high temperature region above the hot water storage tank 1, and the temperature of the high temperature region is lowered. When the temperature in the high temperature region above the hot water storage tank 1 becomes lower than the target hot water supply temperature, it becomes impossible to supply hot water at the target hot water supply temperature, so it is necessary to suppress the temperature drop in the high temperature region above the hot water storage tank 1 as much as possible. It is desirable to keep the temperature of the reclaimed hot water passing through the upper return flow path 307b as much as possible. In particular, if the temperature of the memorial return hot water staying in the upper return flow path 307b greatly decreases while the chasing operation is stopped, the temperature in the upper return flow path 307b having the lowered temperature is reduced at the start of the next memorial operation. The return hot water will flow into the high temperature region above the hot water storage tank 1, which is not preferable. Therefore, by increasing the heat insulation performance of the upper return flow path heat insulating material 8b that keeps the upper return flow path 307b as high as possible, the temperature drop in the high temperature region above the hot water storage tank 1 is suppressed and the energy saving performance is improved. be able to.
これに対し、下方戻し流路307cを介して追焚戻り湯を貯湯タンク1内に戻す場合には、貯湯タンク1の上方の高温領域の温度が低下することはないので、追焚戻り湯の温度が多少低下しても、問題は無い。このため、下方戻し流路307cを保温する下方戻し流路断熱材8cを、上方戻し流路断熱材8bよりも断熱性能が低いものとすることにより、下方戻し流路断熱材8cのコストが低減するので、省エネルギー性に影響を及ぼすことなくコストの低減が図れる。また、下方戻し流路断熱材8cは省略しても良く、その場合にはコストを更に低減することができる。   On the other hand, when the return hot water is returned into the hot water storage tank 1 via the lower return flow path 307c, the temperature of the high temperature region above the hot water storage tank 1 does not decrease. Even if the temperature drops somewhat, there is no problem. For this reason, the lower return flow path heat insulating material 8c for keeping the lower return flow path 307c has a lower heat insulation performance than the upper return flow path heat insulating material 8b, thereby reducing the cost of the lower return flow path heat insulating material 8c. Therefore, the cost can be reduced without affecting the energy saving performance. Further, the lower return flow path heat insulating material 8c may be omitted, and in that case, the cost can be further reduced.
また、本実施の形態1においては、上方戻し流路307bの流路長を下方戻し流路307cの流路長より短くしたことにより、下方戻し流路307cと比べて、上方戻し流路307bの放熱量を低減して保温性能を更に高めることができる。これにより、コストを増加することなく、省エネルギー性を更に高めることができる。   In the first embodiment, the upper return flow path 307b is shorter than the lower return flow path 307c because the upper return flow path 307b is shorter than the lower return flow path 307c. The heat retention performance can be further improved by reducing the amount of heat dissipation. Thereby, energy saving property can further be improved, without increasing cost.
なお、本実施の形態1では、追焚熱交換器5により浴槽水を加熱する追焚運転を実行可能な貯湯式給湯システムを例に説明したが、本発明は、例えば床暖房などの他の用途のために熱交換器により被加熱物を加熱する熱交換運転を実行可能な貯湯式給湯システムにも同様に適用可能である。   In addition, in this Embodiment 1, although the hot water storage type hot-water supply system which can perform the memorial operation which heats bathtub water with the memorial heat exchanger 5 was demonstrated to the example, this invention is other examples, such as floor heating, for example The present invention can be similarly applied to a hot water storage type hot water supply system capable of performing a heat exchange operation for heating an object to be heated by a heat exchanger for use.
実施の形態2.
次に、図5乃至図10を参照して、本発明の実施の形態2について説明するが、上述した実施の形態1との相違点を中心に説明し、同一部分または相当部分は同一符号を付し説明を省略する。図5は、本発明の実施の形態2の貯湯式給湯システムを示す構成図である。図6は、本発明の実施の形態2の貯湯式給湯システムにおける信号の流れを表すブロック図である。
Embodiment 2. FIG.
Next, the second embodiment of the present invention will be described with reference to FIG. 5 to FIG. 10. The description will focus on the differences from the first embodiment described above, and the same or corresponding parts will be denoted by the same reference numerals. The description is omitted. FIG. 5 is a configuration diagram illustrating a hot water storage type hot water supply system according to Embodiment 2 of the present invention. FIG. 6 is a block diagram showing a signal flow in the hot water storage hot water supply system according to Embodiment 2 of the present invention.
≪機器構成≫
図5に示すように、本実施の形態2における貯湯式給湯システムは、実施の形態1に示した構成に加えて、中温水混合手段42と、中温水配管308と、中温水温度センサ508とを備えている。中温水混合手段42は、導出用配管303の途中に配置されている。貯湯タンク1の上方戻し口11と、下方戻し口12との間の高さの位置には、中温水取出口13が設けられている。中温水配管308は、中温水取出口13と、中温水混合手段42とを接続している。中温水混合手段42は、中温水配管308を介して貯湯タンク1の中温水取出口13から導出された中温水と、貯湯タンク1の上部から導出された高温水とを任意の混合比で混合可能になっている。混合手段4は、中温水混合手段42から供給される温水と、混合用配管304から供給される低温水とを混合し、給湯用配管305を通じて、蛇口、シャワー、浴槽6などの負荷側に供給する。このように、本実施形態の貯湯式給湯システムは、中温水配管308を介して貯湯タンク1の中温水取出口13から導出された中温水を系外へ供給可能な給湯経路を有している。なお、本実施形態では、先に中温水と高温水とを混合した後に低温水と混合可能な構成としているが、このような構成に限らず、先に中温水と低温水とを混合した後に高温水と混合する構成にしてもよい。また、目標給湯温度より中温水が高温の場合には中温水と低温水とを混合して給湯し、目標給湯温度より中温水が低温の場合には中温水と高温水とを混合して給湯する構成としてもよい。
≪Device configuration≫
As shown in FIG. 5, in addition to the configuration shown in the first embodiment, the hot water storage hot water supply system according to the second embodiment includes an intermediate warm water mixing means 42, an intermediate warm water pipe 308, and an intermediate warm water temperature sensor 508. It has. The intermediate temperature water mixing means 42 is disposed in the middle of the outlet pipe 303. An intermediate hot water outlet 13 is provided at a height position between the upper return port 11 and the lower return port 12 of the hot water storage tank 1. The intermediate temperature water pipe 308 connects the intermediate temperature water outlet 13 and the intermediate temperature water mixing means 42. The intermediate temperature water mixing means 42 mixes the intermediate temperature water derived from the intermediate temperature water outlet 13 of the hot water storage tank 1 via the intermediate temperature water pipe 308 and the high temperature water derived from the upper part of the hot water storage tank 1 at an arbitrary mixing ratio. It is possible. The mixing means 4 mixes the hot water supplied from the intermediate hot water mixing means 42 and the low-temperature water supplied from the mixing pipe 304 and supplies them to the load side such as a faucet, a shower, and the bathtub 6 through the hot water supply pipe 305. To do. As described above, the hot water storage type hot water supply system of the present embodiment has a hot water supply path that can supply the medium-temperature water derived from the medium-temperature water outlet 13 of the hot-water storage tank 1 via the medium-temperature water pipe 308 to the outside of the system. . In addition, in this embodiment, although it is set as the structure which can be mixed with low temperature water after mixing intermediate temperature water and high temperature water first, not only such a structure but after mixing intermediate temperature water and low temperature water previously. You may make it the structure mixed with high temperature water. Also, when the hot water is hotter than the target hot water temperature, hot water is mixed with hot water, and when the hot water is lower than the hot water temperature, hot water is mixed with hot water. It is good also as composition to do.
図6に示すように、制御手段100には、実施の形態1に示した情報に加えて、中温水温度センサ508からの情報が入力される。制御手段100は、入力された情報に基づいて中温水混合手段42を制御する。   As shown in FIG. 6, in addition to the information shown in Embodiment 1, information from the medium hot water temperature sensor 508 is input to the control means 100. The control means 100 controls the medium hot water mixing means 42 based on the input information.
図7は、追焚運転時に追焚戻り湯を上方戻し流路307bを介して上方戻し口11から貯湯タンク1内に戻したときの貯湯タンク1内の温度分布の変化を説明するための図である。図8は、追焚戻り湯を上方戻し流路307bを介して貯湯タンク1内に戻した場合の中温水取出口13の位置の影響を説明するための図である。なお、図7乃至図10に示す例では、貯湯タンク1の容量を370Lとしている。   FIG. 7 is a diagram for explaining a change in temperature distribution in the hot water storage tank 1 when the hot water for returning the hot water is returned from the upper return port 11 to the hot water storage tank 1 through the upper return flow path 307b during the chasing operation. It is. FIG. 8 is a diagram for explaining the influence of the position of the intermediate temperature water outlet 13 when the return hot water is returned into the hot water storage tank 1 through the upper return flow path 307b. 7 to 10, the hot water storage tank 1 has a capacity of 370L.
図7に示すように、追焚運転時に追焚戻り湯を上方戻し流路307bを介して貯湯タンク1内に戻した場合には、追焚運転によって温度境界層の位置は大きくは変化しない。また、温度境界層より上側の高温領域にある上方戻し口11から流入した追焚戻り湯は、貯湯タンク1内の高温水より温度が低く、密度が大きい。このため、上方戻し口11から流入した追焚戻り湯は、下方に拡散する。したがって、上方戻し口11の高さと、温度境界層との間の範囲にある高温水に追焚戻り湯が混合し、上方戻し口11の高さと温度境界層との間の領域にほぼ均一な温度の中温水層が生成される。上方戻し口11より高い位置では、貯湯タンク1の頂部と同温の領域が減少していくが、上方戻し口11の高さの貯湯温度よりは高温に維持される。この場合には、中温水取出口13が上方戻し口11と温度境界層との間の高さにあれば、中温水を確実に採取できる。また、中温水取出口13の位置が高いほど、利用可能な中温水の量が多くなる。また、中温水層より高い温度の高温水は追焚のために残しておき、給湯に対してはできるだけ中温水を利用することが省エネルギーとなる。したがって、中温水取出口13の位置は、上方戻し口11よりも下の位置であって、なるべく高い位置が望ましい。   As shown in FIG. 7, in the case of the chasing operation, when the chasing return hot water is returned into the hot water storage tank 1 through the upper return channel 307b, the position of the temperature boundary layer does not change greatly by the chasing operation. The reclaimed hot water that has flowed from the upper return port 11 in the high temperature region above the temperature boundary layer has a lower temperature and a higher density than the high temperature water in the hot water storage tank 1. For this reason, the memorial return hot water flowing in from the upper return port 11 diffuses downward. Therefore, the memorial return hot water is mixed with the high-temperature water in the range between the height of the upper return port 11 and the temperature boundary layer, and is almost uniform in the region between the height of the upper return port 11 and the temperature boundary layer. A mesothermal layer of temperature is produced. At a position higher than the upper return port 11, the region having the same temperature as the top of the hot water storage tank 1 decreases, but is maintained at a temperature higher than the hot water storage temperature at the height of the upper return port 11. In this case, if the intermediate temperature water outlet 13 is at a height between the upper return port 11 and the temperature boundary layer, the intermediate temperature water can be reliably collected. In addition, the higher the position of the intermediate warm water outlet 13, the more intermediate warm water that can be used. Moreover, it is energy-saving to leave high-temperature water at a temperature higher than that of the medium-temperature water layer for remedy and to use medium-temperature water as much as possible for hot water supply. Therefore, the position of the intermediate temperature water outlet 13 is preferably a position below the upper return port 11 and as high as possible.
図9は、追焚運転時に追焚戻り湯を下方戻し流路307cを介して下方戻し口12から貯湯タンク1内に戻したときの貯湯タンク1内の温度分布の変化を説明するための図である。図10は、追焚戻り湯を下方戻し流路307cを介して貯湯タンク1内に戻した場合の中温水取出口13の位置の影響を説明するための図である。   FIG. 9 is a diagram for explaining a change in temperature distribution in the hot water storage tank 1 when the hot water for returning the hot water is returned from the lower return port 12 to the hot water storage tank 1 through the lower return flow path 307c during the hot water operation. It is. FIG. 10 is a diagram for explaining the influence of the position of the middle temperature water outlet 13 when the return hot water is returned into the hot water storage tank 1 via the lower return flow path 307c.
図9に示すように、追焚運転時に追焚戻り湯を下方戻し流路307cを介して貯湯タンク1内に戻した場合には、温度境界層の下側の低温水に追焚戻り湯が流入することにより、温度境界層の位置が上昇していく。また、下方戻し口12から流入した追焚戻り湯は、貯湯タンク1内の低温水より温度が高く、密度が小さい。このため、下方戻し口12から流入した追焚戻り湯は、上方に拡散する。したがって、下方戻し口12の高さと温度境界層との間の範囲にある低温水に追焚戻り湯が混合することにより、下方戻し口12の高さと温度境界層との間の領域に、ほぼ均一な温度の中温水層が生成される。この中温水層の温度は、追焚運転が続くにつれて上昇する。一方、下方戻し口12の高さより低い領域の温度は、追焚運転開始時と大きく変化せず、ほぼ給水温度のままである。このように、下方戻し口12の高さと温度境界層との間の領域に中温水層が生成されるので、中温水取出口13が下方戻し口12より高い位置であって温度境界層より低い位置になければ中温水が採取できない。したがって、中温水取出口13は、下方戻し口12より高い位置であって、なるべく低い位置にある方が、中温水を採取できる可能性は高い。しかしながら、中温水取出口13が低い位置にあるほど、採取できる中温水の量が少なくなる。ゆえに、中温水取出口13の位置は、下方戻し口12よりも上であって、かつ、温度境界層が到達する範囲においてできるだけ高い位置が望ましい。ここで、温度境界層が到達する高さとしては、一般的に追焚運転が実施される時間帯では一日の給湯負荷の過半が終了していると想定されるので、貯湯タンク1の2分の1の高さ、またはそれより高い位置が、温度境界層が到達する高さとしてもよい。   As shown in FIG. 9, when the remedy return hot water is returned into the hot water storage tank 1 through the lower return flow path 307c during the remedy operation, the remedy return hot water is added to the low temperature water below the temperature boundary layer. By flowing in, the position of the temperature boundary layer rises. Further, the memorial hot water flowing in from the lower return port 12 has a higher temperature and a lower density than the low-temperature water in the hot water storage tank 1. For this reason, the memorial return hot water flowing in from the lower return port 12 diffuses upward. Therefore, when the return hot water is mixed with the low temperature water in the range between the height of the lower return port 12 and the temperature boundary layer, the region between the height of the lower return port 12 and the temperature boundary layer is approximately A mesothermal water layer of uniform temperature is produced. The temperature of the intermediate warm water layer rises as the memorial operation continues. On the other hand, the temperature in the region lower than the height of the lower return port 12 does not change significantly from the start of the chasing operation, and remains substantially at the water supply temperature. As described above, since the intermediate warm water layer is generated in the region between the height of the lower return port 12 and the temperature boundary layer, the intermediate warm water outlet 13 is positioned higher than the lower return port 12 and lower than the temperature boundary layer. If it is not in the position, medium-temperature water cannot be collected. Therefore, the medium-temperature water outlet 13 is higher than the lower return port 12 and is located at a position as low as possible. However, the lower the intermediate warm water outlet 13 is, the smaller the amount of intermediate warm water that can be collected. Therefore, the position of the intermediate temperature water outlet 13 is preferably as high as possible in the range above the lower return port 12 and reaching the temperature boundary layer. Here, as the height at which the temperature boundary layer reaches, it is generally assumed that the majority of the hot water supply load of the day is completed in the time zone in which the chasing operation is performed. The height that is a fraction of the height or higher may be the height that the temperature boundary layer reaches.
以上のように、本実施の形態2においては、中温水取出口13を上方戻し口11と下方戻し口12との間の高さに配置したことにより、追焚運転時に追焚戻り湯が上方戻し流路307bと下方戻し流路307cとの何れを介して貯湯タンク1に戻された場合であっても、生成した中温水を確実に採取することができる。このため、中温水を給湯に有効に活用することができ、省エネルギー化が図れる。   As described above, in the second embodiment, the intermediate hot water outlet 13 is disposed at a height between the upper return port 11 and the lower return port 12 so that the remedy return hot water is upward during the remedy operation. Even if it is a case where it returns to the hot water storage tank 1 via any of the return flow path 307b and the downward return flow path 307c, the produced | generated intermediate warm water can be collected reliably. For this reason, medium temperature water can be used effectively for hot water supply, and energy saving can be achieved.
また、中温水取出口13は、下方戻し口12よりも上方戻し口11に近い高さの位置、すなわち下方戻し口12と上方戻し口11との中間の高さより高い位置に配置することがより好ましい。上述したように、上方戻し流路307bを介して貯湯タンク1内に戻した追焚戻り湯により生成された中温水を採取する場合には、中温水取出口13の位置が上方戻し口11の高さになるべく近いほど、採取できる中温水の量が多くなり、省エネルギー化が図れる。一方、下方戻し流路307cは、省エネルギーを主な目的としたものではなく、高い追焚能力の維持を主な目的としたものである。このため、下方戻し流路307cを介して貯湯タンク1内に戻した追焚戻り湯を再利用する必要性はそれほど高くない。そこで、中温水取出口13を、下方戻し口12よりも上方戻し口11に近い高さの位置に配置することにより、上方戻し流路307bを介して貯湯タンク1内に戻した追焚戻り湯の利用効率を向上することができ、より効果的に省エネルギー化が図れる。   In addition, the intermediate temperature water outlet 13 is disposed at a position closer to the upper return opening 11 than the lower return opening 12, that is, at a position higher than the intermediate height between the lower return opening 12 and the upper return opening 11. preferable. As described above, when collecting the warm water generated by the reclaimed hot water returned to the hot water storage tank 1 through the upper return flow path 307b, the position of the warm water outlet 13 is set at the upper return port 11. The closer to the height, the greater the amount of medium-temperature water that can be collected, thus saving energy. On the other hand, the lower return flow path 307c is not mainly intended to save energy, but is mainly intended to maintain high memorial ability. For this reason, it is not so high that the reclaimed hot water returned to the hot water storage tank 1 through the lower return flow path 307c is reused. Accordingly, the memorial return hot water returned to the hot water storage tank 1 through the upper return flow path 307b by disposing the intermediate hot water outlet 13 at a position closer to the upper return port 11 than the lower return port 12. Can be used more efficiently and energy can be saved more effectively.
なお、本実施の形態2と異なり、追焚戻り湯を、貯湯タンク1内の温度が追焚戻り湯と略同一温度となる領域に戻す構成とした場合には、貯湯タンク1の下方の低温領域に戻す場合と同じく、追焚運転による中温水は追焚戻り湯の戻し口の位置より上方に生成される。したがって、中温水取出口13は、追焚戻り湯の戻し口の位置よりも高い位置に配置する必要がある。これに対して、本実施の形態2では、上方戻し流路307bを介して貯湯タンク1内に戻す追焚戻り湯は、追焚戻り湯の温度より高い高温領域に流入するので、上方戻し口11よりも低い位置に中温水が生成される。このため、上方戻し口11よりも低い位置に中温水取出口13を配置することにより、追焚運転により生成された中温水を効率良く採取することができ、効果的に省エネルギー性能を改善することができる。   Unlike the second embodiment, in the case where the return hot water is configured to return to a region where the temperature in the hot water storage tank 1 is substantially the same as that of the hot water return hot water, the low temperature below the hot water storage tank 1 is low. As in the case of returning to the area, the medium hot water by the chasing operation is generated above the position of the chasing return hot water return port. Therefore, it is necessary to arrange the intermediate temperature water outlet 13 at a position higher than the position of the return port of the memorial return hot water. On the other hand, in the second embodiment, the remedy return hot water returned to the hot water storage tank 1 through the upper return flow path 307b flows into a high temperature region higher than the temperature of the remedy return hot water. Intermediate warm water is generated at a position lower than 11. For this reason, by arranging the intermediate warm water outlet 13 at a position lower than the upper return port 11, the intermediate warm water generated by the memorial operation can be efficiently collected, and the energy saving performance is effectively improved. Can do.
実施の形態3.
次に、図11乃至図13を参照して、本発明の実施の形態3について説明するが、上述した実施の形態1、2との相違点を中心に説明し、同一部分または相当部分は同一符号を付し説明を省略する。
Embodiment 3 FIG.
Next, the third embodiment of the present invention will be described with reference to FIG. 11 to FIG. 13. The description will focus on the differences from the first and second embodiments described above, and the same or corresponding parts will be the same. Reference numerals are assigned and description is omitted.
追焚運転の停止中に冷えた熱交換回路内の残留水は、給水温度に対しても有効なエネルギーをほとんど有さないほどに温度が低下している場合があるので、貯湯タンク1の上方に流入させることは回避することが望ましい。そこで、本実施の形態3では、追焚運転を開始する際に、この熱交換回路内の残留水を貯湯タンク1の下方に戻す追焚予備運転(熱交換予備運転)を行う。   The temperature of the residual water in the heat exchange circuit that has been cooled during the stoppage of the memorial operation may be so low that it has little energy for the feed water temperature. It is desirable to avoid flowing into Therefore, in the third embodiment, when starting the renewal operation, a renewal preparatory operation (preliminary heat exchange operation) for returning the residual water in the heat exchange circuit to the lower side of the hot water storage tank 1 is performed.
≪実施の形態3に特徴的な動作≫
図11は、追焚予備運転を実行する制御動作を表すフローチャートである。図11に示すように、まず、追焚運転の実行中かどうかが判断され(ステップS1)、追焚運転が実行されていないと判断された場合には、流路切替弁7がデフォルトの状態(ここでは、下方戻し流路307c側の状態)に制御される。このため、本実施形態では、追焚運転の開始時には、流路切替弁7は事前に下方戻し流路307c側に切り替えられている。ステップS1で追焚運転の実行中と判断された場合には、次に、追焚往き配管307aおよび追焚熱交換器5内の残留水がすべて高温水に置換されたかどうかが判断される(ステップS3)。残留水がまだすべて高温水に置換されていないと判断された場合には、流路切替弁7を下方戻し流路307c側にした状態で追焚用ポンプ32を作動させる追焚予備運転が継続される(ステップS4)。この追焚予備運転により、貯湯タンク1の上部から導出された高温水が追焚往き配管307aおよび追焚熱交換器5内に流入するとともに、追焚往き配管307aおよび追焚熱交換器5内の残留水は、下方戻し流路307cを通って貯湯タンク1の下方に戻される。ステップS3で、追焚往き配管307aおよび追焚熱交換器5内の残留水がすべて高温水に置換されたと判断された場合には、ステップS5の追焚本運転(通常の追焚運転)に移行する。
<< Operation Characteristic of Embodiment 3 >>
FIG. 11 is a flowchart showing the control operation for executing the memorial preliminary operation. As shown in FIG. 11, first, it is determined whether or not the chasing operation is being performed (step S1). If it is determined that the chasing operation is not being performed, the flow path switching valve 7 is in the default state. (Here, the state is on the lower return flow path 307c side). For this reason, in this embodiment, the flow path switching valve 7 is switched to the lower return flow path 307c in advance at the start of the chasing operation. If it is determined in step S1 that the chasing operation is being performed, it is next determined whether or not all the residual water in the chasing forward pipe 307a and the chasing heat exchanger 5 has been replaced with high-temperature water ( Step S3). When it is determined that all of the residual water has not been replaced with high-temperature water, the preliminary charging operation for operating the additional pump 32 with the flow path switching valve 7 set to the lower return flow path 307c is continued. (Step S4). As a result of this preliminary operation, high-temperature water led out from the upper part of the hot water storage tank 1 flows into the additional piping 307a and the additional heat exchanger 5, and at the same time within the additional piping 307a and the additional heat exchanger 5. The remaining water is returned to the lower side of the hot water storage tank 1 through the lower return passage 307c. If it is determined in step S3 that all the residual water in the remedy outgoing pipe 307a and the remedy heat exchanger 5 has been replaced with high-temperature water, the remedy main operation (normal remedy operation) in step S5 is performed. Transition.
図12は、追焚本運転における制御動作を表すフローチャートである。図12に示すように、追焚本運転が開始された場合には、まず、過去所定期間(例えば数日間)の間に高能力追焚の実績があるかどうかを判断する(ステップS10)。過去所定期間に高能力追焚の実績がある場合には、当日も高能力追焚の要求が発生する可能性が高いと判断できるので、貯湯タンク1の上方の高温領域の湯温を高く維持して追焚能力を保持するために、流路切替弁7を下方戻し流路307c側にした状態で、追焚運転を実施する(ステップS11)。一方、ステップS10で、過去所定期間に高能力追焚の実績がない場合には、次に、現在貯湯タンク1に存在する追焚有効蓄熱量を追焚有効蓄熱量算出手段101により算出し(ステップS12)、追焚必要熱量予測手段104により追焚必要熱量を予測する(ステップS13)。そして、追焚有効蓄熱量と追焚必要熱量とを比較する(ステップS14)。その比較の結果、追焚有効蓄熱量が追焚必要熱量より大きい場合、または追焚有効蓄熱量が追焚必要熱量より所定の余裕代以上に大きい場合には、追焚熱量の不足は発生しないと判断できるので、流路切替弁7を上方戻し流路307b側にした状態で追焚運転を実施し(ステップS15)、そうでない場合には、追焚熱量の不足を防止するために、流路切替弁7を下方戻し流路307c側にした状態で追焚運転を実施する(ステップS16)。   FIG. 12 is a flowchart showing a control operation in the memorial main operation. As shown in FIG. 12, when the memorial main operation is started, first, it is determined whether or not there is a track record of high-capacity memorization during a past predetermined period (for example, several days) (step S10). If there is a record of high-capacity remembrance in the past predetermined period, it can be judged that there is a high possibility that a request for high-capacity remembrance will occur on the day, so the hot water temperature in the high temperature region above the hot water tank 1 is kept high. In order to maintain the chasing capability, the chasing operation is performed with the flow path switching valve 7 on the lower return flow path 307c side (step S11). On the other hand, if there is no record of high-capacity tracking in the past predetermined period in step S10, then the tracking effective heat storage amount present in the hot water storage tank 1 is calculated by the tracking effective heat storage amount calculation means 101 ( In step S12), the required heat amount for tracking is predicted by the required heat amount prediction means 104 (step S13). Then, the effective tracking heat storage amount and the required tracking heat amount are compared (step S14). As a result of the comparison, if the effective heat storage amount is larger than the required heat amount, or if the effective heat amount is larger than the required heat amount, the shortage of the additional heat amount will not occur. Therefore, the chasing operation is performed with the flow path switching valve 7 set to the upper return flow path 307b side (step S15). Otherwise, in order to prevent shortage of the chasing heat quantity, A chasing operation is performed in a state where the path switching valve 7 is set to the lower return flow path 307c side (step S16).
ここで、追焚往き配管307aおよび追焚熱交換器5内の残留水がすべて高温水に置換されたかどうかの判定は、例えば、追焚戻り湯温度センサ507により検出される追焚戻り湯温度が、浴槽戻り湯温度センサ506により検出される浴槽戻り湯温度を超えた場合に、残留水の置換が完了したと判定することができる。また、追焚戻り湯温度が所定の閾値(例えば給湯温度に近い35℃)を超えた場合に、残留水の置換が完了したと判定しても良い。   Here, the determination as to whether all the residual water in the remedy outgoing pipe 307a and the remedy heat exchanger 5 has been replaced with high-temperature water is, for example, the remedy return hot water temperature detected by the remedy return hot water temperature sensor 507. However, when the bath return hot water temperature detected by the bath return hot water temperature sensor 506 is exceeded, it can be determined that the replacement of the residual water has been completed. Moreover, you may determine with the replacement of residual water having been completed when the temperature of return hot water exceeds a predetermined threshold (for example, 35 degreeC close | similar to hot water supply temperature).
あるいは、追焚予備運転中の追焚用ポンプ32による送水量をポンプ回転数から推定し、その積分値が残留水の体積(追焚往き配管307aおよび追焚熱交換器5内の容積)を超えた場合に、残留水が置換されたと判定しても良い。この制御によれば、追焚戻り湯温度センサ507や浴槽戻り湯温度センサ506を備えない場合であっても、追焚予備運転の継続時間に過不足がないように適切に制御することができる。   Alternatively, the amount of water supplied by the remedy pump 32 during the preparatory operation of the remedy is estimated from the number of revolutions of the pump, and the integrated value is the volume of residual water (the volume in the remedy forward pipe 307a and the remedy heat exchanger 5). When it exceeds, you may determine with the residual water having been substituted. According to this control, even if the remedy return hot water temperature sensor 507 and the tub return hot water temperature sensor 506 are not provided, it can be appropriately controlled so that the duration of the remedy preliminary operation is not excessive or insufficient. .
また、本実施の形態3では、図11に示す制御動作に代えて、図13に示す制御動作を実行しても良い。図13に示す制御動作では、追焚往き配管307aおよび追焚熱交換器5内の残留水が低温になっていない場合には追焚予備運転を行わず、直ちに追焚本運転に移行する。図13のフローチャートは、図11のフローチャートのステップS1とステップS3との間にステップS6が挿入されたものである。図13に示す制御動作の場合には、ステップS1で追焚運転の実行中と判断された場合には、次に、追焚戻り湯温度センサ507の出力値から推定される残留水の温度と所定温度(例えば給湯温度に近い35℃)とを比較する(ステップS6)。その結果、残留水の温度が上記所定温度以上であると判断された場合には、追焚予備運転を行うことなく、直ちにステップS5の追焚本運転に移行する。一方、ステップS6で、残留水の温度が上記所定温度より低いと判断された場合には、ステップS3に移行し、図11に示す制御動作と同様の制御を行う。図13に示す制御動作によれば、残留水が低温になっていない場合には、不必要な追焚予備運転の実施を回避することができるので、更に省エネルギー化に寄与する。   In the third embodiment, the control operation shown in FIG. 13 may be executed instead of the control operation shown in FIG. In the control operation shown in FIG. 13, when the residual water in the tracking forward pipe 307 a and the tracking heat exchanger 5 is not at a low temperature, the tracking preliminary operation is not performed, and the mode immediately shifts to the tracking main operation. In the flowchart of FIG. 13, step S6 is inserted between step S1 and step S3 of the flowchart of FIG. In the case of the control operation shown in FIG. 13, if it is determined in step S <b> 1 that the chasing operation is being performed, the temperature of the residual water estimated from the output value of the chasing return hot water temperature sensor 507 is set next. A predetermined temperature (for example, 35 ° C. close to the hot water supply temperature) is compared (step S6). As a result, when it is determined that the temperature of the residual water is equal to or higher than the predetermined temperature, the process immediately shifts to the follow-up main operation in step S5 without performing the follow-up preliminary operation. On the other hand, when it is determined in step S6 that the temperature of the residual water is lower than the predetermined temperature, the process proceeds to step S3 and the same control as the control operation shown in FIG. 11 is performed. According to the control operation shown in FIG. 13, when the residual water is not at a low temperature, it is possible to avoid the need for the extra tracking preliminary operation, which further contributes to energy saving.
なお、図13に示す制御動作において、残留水の温度低下を、追焚戻り湯温度センサ507によらずに、前回の追焚運転の終了時から今回の追焚運転の開始時までの経過時間に所定の温度低下率を乗算することで推定し、その推定された残留水の温度低下が所定量より小さい場合には、追焚予備運転を実施しないようにしても良い。このような制御によれば、追焚戻り湯温度センサ507を備えない場合であっても、不必要な追焚予備運転の実施を回避することができる。   In the control operation shown in FIG. 13, the elapsed time from the end of the previous memorial operation to the start of the present memorial operation, regardless of the temperature drop of the residual water, regardless of the memorial return hot water temperature sensor 507. When the estimated temperature drop of the residual water is smaller than a predetermined amount, the supplementary preliminary operation may not be performed. According to such control, it is possible to avoid unnecessary unnecessary preliminary maintenance operation even when the additional return hot water temperature sensor 507 is not provided.
以上説明した本実施の形態3によれば、追焚往き配管307aおよび追焚熱交換器5内に滞留して冷えた低温の残留水が貯湯タンク1の上方の高温領域に流入することを確実に回避できるので、省エネルギー性能を更に改善することができる。   According to the third embodiment described above, it is ensured that the low-temperature residual water that has accumulated and cooled in the follow-up piping 307a and the follow-up heat exchanger 5 flows into the high-temperature region above the hot water storage tank 1. Therefore, the energy saving performance can be further improved.
1 貯湯タンク
2 加熱手段
4 混合手段
5 追焚熱交換器
6 浴槽
7 流路切替弁
8a 追焚往き配管断熱材
8b 上方戻し流路断熱材
8c 下方戻し流路断熱材
11 上方戻し口
12 下方戻し口
13 中温水取出口
31 加熱用ポンプ
32 追焚用ポンプ
33 浴槽用ポンプ
41 混合手段
42 中温水混合手段
100 制御手段
301 加熱用配管
302 給水用配管
303 導出用配管
304 混合用配管
305 給湯用配管
306a 浴槽往き配管
306b 浴槽戻り配管
307a 追焚往き配管
307b 上方戻し流路
307c 下方戻し流路
308 中温水配管
501a〜501f 貯湯温度センサ
502 沸上温度センサ
503 導出温度センサ
504 給水温度センサ
505 給湯温度センサ
506 浴槽戻り湯温度センサ
507 追焚戻り湯温度センサ
508 中温水温度センサ
601 給湯流量センサ
DESCRIPTION OF SYMBOLS 1 Hot water storage tank 2 Heating means 4 Mixing means 5 Reheating heat exchanger 6 Bathtub 7 Flow path switching valve 8a Retreating piping heat insulating material 8b Upper return flow path heat insulating material 8c Lower return flow path heat insulating material 11 Upper return port 12 Lower return Port 13 Medium temperature water outlet 31 Heating pump 32 Remembrance pump 33 Bath pump 41 Mixing means 42 Medium temperature water mixing means 100 Control means 301 Heating pipe 302 Water supply pipe 303 Outlet pipe 304 Mixing pipe 305 Hot water supply pipe 306a Bathtub return pipe 306b Bathtub return pipe 307a Retreat return pipe 307b Upper return path 307c Lower return path 308 Medium hot water pipes 501a to 501f Hot water storage temperature sensor 502 Boiling temperature sensor 503 Derived temperature sensor 504 Hot water supply temperature sensor 505 Hot water supply temperature sensor 506 Bath return hot water temperature sensor 507 Remembrance return hot water temperature sensor 508 Medium hot water temperature Sensor 601 Hot water flow rate sensor

Claims (8)

  1. 水を加熱して高温水を生成可能な加熱手段と、
    温度境界層を介して、上側に高温水を貯留し、下側に低温水を貯留する貯湯タンクと、
    被加熱物を加熱するための熱交換器と、
    前記貯湯タンクから導出された高温水を前記熱交換器に送る移送手段と、
    前記貯湯タンクから導出された高温水を前記熱交換器に送って前記熱交換器により前記被加熱物を加熱する熱交換運転時に、前記熱交換器に送られた高温水が前記熱交換器を通過して温度低下した戻り湯を、前記温度境界層より上側の前記貯湯タンクの上方領域に流入させる上方戻し流路と、
    前記熱交換運転時に、前記戻り湯を、前記温度境界層より下側の前記貯湯タンクの下方領域に流入させる下方戻し流路と、
    前記戻り湯を前記上方戻し流路に流入させる状態と前記下方戻し流路に流入させる状態とに切り替え可能な流路切替手段と、
    前記熱交換運転時に、前記流路切替手段を制御することにより、前記戻り湯を前記上方戻し流路を介して前記貯湯タンク内に流入させるか前記下方戻し流路を介して前記貯湯タンク内に流入させるかを制御する制御手段と、
    を備える貯湯式給湯システム。
    Heating means capable of generating high temperature water by heating water;
    A hot water storage tank for storing high-temperature water on the upper side and low-temperature water on the lower side through a temperature boundary layer;
    A heat exchanger for heating an object to be heated;
    Transfer means for sending high-temperature water derived from the hot water storage tank to the heat exchanger;
    During the heat exchange operation in which the hot water led out from the hot water storage tank is sent to the heat exchanger and the object to be heated is heated by the heat exchanger, the high temperature water sent to the heat exchanger causes the heat exchanger to An upper return flow path for allowing the returned hot water that has passed through and lowered in temperature to flow into an upper region of the hot water storage tank above the temperature boundary layer;
    A lower return flow path for allowing the return hot water to flow into a lower region of the hot water storage tank below the temperature boundary layer during the heat exchange operation;
    Channel switching means capable of switching between a state in which the return hot water flows into the upper return channel and a state in which the return hot water flows into the lower return channel;
    By controlling the flow path switching means during the heat exchange operation, the return hot water is allowed to flow into the hot water storage tank via the upper return flow path or into the hot water storage tank via the lower return flow path. Control means for controlling whether to flow in,
    A hot water storage hot water system.
  2. 前記上方戻し流路を覆う断熱材を備え、
    前記下方戻し流路は、前記上方戻し流路を覆う前記断熱材より断熱性能の低い断熱材で覆われているか、または断熱材で覆われていない請求項1記載の貯湯式給湯システム。
    A heat insulating material covering the upper return flow path;
    The hot water storage hot water supply system according to claim 1, wherein the lower return flow path is covered with a heat insulating material having a lower heat insulating performance than the heat insulating material covering the upper return flow path, or is not covered with a heat insulating material.
  3. 前記上方戻し流路の流路長が前記下方戻し流路の流路長より短い請求項1または2記載の貯湯式給湯システム。   The hot water storage hot water supply system according to claim 1 or 2, wherein a channel length of the upper return channel is shorter than a channel length of the lower return channel.
  4. 前記貯湯タンクに設けられ、前記上方戻し流路が接続された上方戻し口と、
    前記貯湯タンクに設けられ、前記下方戻し流路が接続された下方戻し口と、
    前記貯湯タンクの、前記上方戻し口と前記下方戻し口との間の高さに設けられた中温水取出口と、
    前記中温水取出口を介して前記貯湯タンク内から導出された温水を系外へ供給可能な給湯経路と、
    を備える請求項1記載の貯湯式給湯システム。
    An upper return port provided in the hot water storage tank and connected to the upper return flow path;
    A lower return port provided in the hot water storage tank and connected to the lower return flow path;
    An intermediate temperature water outlet provided at a height between the upper return port and the lower return port of the hot water storage tank;
    A hot water supply path capable of supplying hot water derived from the hot water storage tank to the outside of the hot water storage tank through the intermediate hot water outlet
    The hot water storage hot water supply system according to claim 1, comprising:
  5. 前記中温水取出口は、前記下方戻し口より前記上方戻し口に近い高さに設けられている請求項4記載の貯湯式給湯システム。   The hot water storage hot water supply system according to claim 4, wherein the intermediate temperature water outlet is provided at a height closer to the upper return port than to the lower return port.
  6. 前記制御手段は、前記熱交換運転を開始する際に、前記流路切替手段を前記下方戻し流路側に切り替えた状態で、前記貯湯タンクから導出された高温水を前記熱交換器に送ることにより前記移送手段および前記熱交換器の内部に残留している残留水を前記高温水に置換する熱交換予備運転を行う手段を含む請求項1記載の貯湯式給湯システム。   When the control means starts the heat exchange operation, the control means sends the high-temperature water derived from the hot water storage tank to the heat exchanger in a state where the flow path switching means is switched to the lower return flow path side. The hot water storage hot water supply system according to claim 1, further comprising means for performing a heat exchange preparatory operation for replacing residual water remaining inside the transfer means and the heat exchanger with the high temperature water.
  7. 前記制御手段は、前記移送手段による送水量と前記残留水の量とに基づいて、前記熱交換予備運転の継続時間を制御する請求項6記載の貯湯式給湯システム。   The hot water storage hot water supply system according to claim 6, wherein the control means controls the duration of the heat exchange preliminary operation based on the amount of water supplied by the transfer means and the amount of residual water.
  8. 前記制御手段は、前回の前記熱交換運転の終了時から今回の前記熱交換運転の開始時までの経過時間に基づいて前記熱交換予備運転の実行の要否を判定する請求項6または7記載の貯湯式給湯システム。   The said control means determines the necessity of execution of the said heat exchange preliminary operation based on the elapsed time from the time of completion | finish of the said last heat exchange operation to the time of the start of this heat exchange operation of this time. Hot water storage system.
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