JP6111409B2 - Water heater - Google Patents
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- JP6111409B2 JP6111409B2 JP2012091579A JP2012091579A JP6111409B2 JP 6111409 B2 JP6111409 B2 JP 6111409B2 JP 2012091579 A JP2012091579 A JP 2012091579A JP 2012091579 A JP2012091579 A JP 2012091579A JP 6111409 B2 JP6111409 B2 JP 6111409B2
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Description
本発明は、熱回収機能を有する給湯装置に関するものである。 The present invention relates to a hot water supply apparatus having a heat recovery function.
従来、この種の給湯装置には、浴槽の湯を加温する追い焚き運転と浴槽の湯から熱を回収する熱回収運転を機能として備えたものがある(例えば、特許文献1参照)。 Conventionally, this type of hot water supply apparatus includes a reheating operation for heating the hot water in the bathtub and a heat recovery operation for recovering heat from the hot water in the bathtub (for example, see Patent Document 1).
図17は、熱回収運転を機能として有する給湯装置であり、1は貯湯槽、2はヒートポンプユニット、3は浴槽、4は熱交換器、5aは貯湯槽水搬送ポンプ、5bは浴槽水搬送ポンプ、6は熱回収分岐管、7は三方弁、8は高温水供給管、9は低温水供給管、10は給湯管、11は混合弁、12は浴槽水循環配管、13は開閉弁、14は給水管、15は給湯分岐管、16は熱交戻り管である。 FIG. 17 shows a hot water supply apparatus having a heat recovery operation as a function. 1 is a hot water storage tank, 2 is a heat pump unit, 3 is a bathtub, 4 is a heat exchanger, 5a is a hot water tank water transport pump, and 5b is a bath water transport pump. , 6 is a heat recovery branch pipe, 7 is a three-way valve, 8 is a high temperature water supply pipe, 9 is a low temperature water supply pipe, 10 is a hot water supply pipe, 11 is a mixing valve, 12 is a bath water circulation pipe, 13 is an on-off valve, 14 is A water supply pipe, 15 is a hot water supply branch pipe, and 16 is a heat exchange return pipe.
浴槽水循環配管12は、浴槽3の往き管と戻り管とを環状に接続して構成され、回路上に熱交換器4および浴槽水搬送ポンプ5bを備える。 The bathtub water circulation pipe 12 is configured by connecting the forward pipe and the return pipe of the bathtub 3 in an annular shape, and includes a heat exchanger 4 and a bathtub water conveyance pump 5b on the circuit.
また、混合弁11は、高温水供給管8と低温水供給管9とを入口側に接続し、給湯管10を出口側に接続するように構成され、開閉弁13を介して浴槽水循環配管12と接続される。さらに浴槽内の水温を検知する浴槽水温検知手段17が、浴槽水循環配管12の途中に設けられている。 The mixing valve 11 is configured to connect the high temperature water supply pipe 8 and the low temperature water supply pipe 9 to the inlet side, and connect the hot water supply pipe 10 to the outlet side, and the bathtub water circulation pipe 12 via the on-off valve 13. Connected. Further, a bathtub water temperature detecting means 17 for detecting the water temperature in the bathtub is provided in the middle of the bathtub water circulation pipe 12.
この給湯装置が風呂自動運転を行う場合は、まず、貯湯槽1に貯えられた湯と給水管14から供給される水とを混合弁11で所望温度の湯に混合して浴槽3へ給湯する。浴槽3へ給湯した後は、一定時間だけ湯の温度を一定に保つために保温動作を行う。 When this hot water supply apparatus performs bath automatic operation, first, hot water stored in the hot water storage tank 1 and water supplied from the water supply pipe 14 are mixed with hot water at a desired temperature by the mixing valve 11 to supply hot water to the bathtub 3. . After the hot water is supplied to the bathtub 3, a heat retaining operation is performed in order to keep the temperature of the hot water constant for a certain period of time.
保温動作は、浴槽湯温が一定温度以下に降下した場合におこない、貯湯槽水搬送ポンプ5aと浴槽水搬送ポンプ5bとを運転して、熱交換器4において、貯湯槽1内の湯(例えば約80℃)により浴槽3内の湯(例えば約35℃)を加温する。 The heat insulation operation is performed when the bath water temperature falls below a certain temperature. The hot water storage tank water transport pump 5a and the bath water transport pump 5b are operated, and the heat exchanger 4 performs hot water (for example, The hot water (for example, about 35 ° C.) in the bathtub 3 is heated by about 80 ° C.).
また、浴槽3の水温が一定温度以下に降下しているかどうかを判断するために、浴槽水搬送ポンプ5bのみを運転させる浴槽水温検知動作を間欠的に行う。 Moreover, in order to judge whether the water temperature of the bathtub 3 has fallen below the fixed temperature, the bathtub water temperature detection operation | movement which drives only the bathtub water conveyance pump 5b is performed intermittently.
浴槽水温検知手段17により浴槽3の水温が一定温度以下に降下していることが検知された場合には保温動作を行い、降下していない場合にはそのまま待機する。一定時間が経過した後には風呂自動運転を自動で終了する。 When the bath water temperature detecting means 17 detects that the water temperature of the bathtub 3 is lowered below a certain temperature, the heat retaining operation is performed, and when the bath water temperature detecting means 17 is not lowered, it waits as it is. After a certain period of time has elapsed, automatic bath operation is automatically terminated.
次に、追い焚き運転を行う場合は、貯湯槽水搬送ポンプ5aと浴槽水搬送ポンプ5bとが運転をおこなって、熱交換器4において、貯湯槽1内の湯(例えば約80℃)が浴槽3内の湯(例えば約35℃)を加温する。その結果、浴槽3内の水温は上昇し、貯湯槽1内に湯として貯えられている熱量(蓄熱量)は減少する。 Next, when the reheating operation is performed, the hot water storage tank water transfer pump 5a and the bathtub water transfer pump 5b operate, and the hot water (for example, about 80 ° C.) in the hot water storage tank 1 is stored in the bathtub in the heat exchanger 4. The hot water in 3 (for example, about 35 ° C.) is heated. As a result, the water temperature in the bathtub 3 rises, and the amount of heat (heat storage amount) stored as hot water in the hot water tank 1 decreases.
最後に、熱回収運転を行う場合は、同様に貯湯槽水搬送ポンプ5aと浴槽水搬送ポンプ
5bとが運転を行うが、熱交換器4において、貯湯槽1内の水(例えば約10℃)が浴槽3内の水(例えば約35℃)を冷却して熱を回収する。
Finally, in the case of performing the heat recovery operation, the hot water tank water transfer pump 5a and the bath water transfer pump 5b are similarly operated. In the heat exchanger 4, the water in the hot water tank 1 (for example, about 10 ° C.) Cools the water (for example, about 35 ° C.) in the bathtub 3 and recovers heat.
その結果、浴槽3内の水温は降下し、貯湯槽1内に湯として貯えられる熱量(蓄熱量)は増加するので、ヒートポンプユニット2により沸き上げる熱量を軽減することができる。 As a result, the water temperature in the bathtub 3 drops and the amount of heat (heat storage amount) stored as hot water in the hot water tank 1 increases, so that the amount of heat heated up by the heat pump unit 2 can be reduced.
また、このような運転を制御する方式のひとつに、風呂自動運転を停止した後、熱回収運転を開始するまでの時間を予め設定し、この時間を満了すると熱回収運転を行うというものがある(例えば、特許文献2参照)。
また、熱回収の開始前には、例えば、開始を予告する表示をリモコンで行ったり、音声によって開始を認識させ、熱回収中には、回収中であることを示す情報としてリモコンへ表示している文字を点滅したり等の、使用者への熱回収の動作の認識を高めている(例えば、特許文献2参照)。
In addition, as one of the methods for controlling such operation, there is a method of setting a time until the heat recovery operation is started after stopping the automatic bath operation, and performing the heat recovery operation when this time expires. (For example, refer to Patent Document 2).
Also, before the start of heat recovery, for example, a display for notifying the start is performed with a remote control, or the start is recognized by voice, and during heat recovery, information indicating that recovery is in progress is displayed on the remote control. The recognition of the heat recovery operation to the user, such as blinking the characters being displayed, is enhanced (for example, see Patent Document 2).
図18は、特許文献2に記載された従来の給湯装置の制御ブロックを示すものである。 FIG. 18 shows a control block of a conventional hot water supply apparatus described in Patent Document 2.
運転制御手段18は、風呂自動運転検出部19が風呂自動運転の停止を検出した後、熱回収運転を開始させるまでの時間を測定するタイマ20を動作させ、予め設定された時間を満了すれば熱回収運転制御手段21に熱回収運転を開始させる。 The operation control means 18 operates the timer 20 which measures the time until the heat recovery operation is started after the bath automatic operation detection unit 19 detects the stop of the automatic bath operation, and the preset time has expired. The heat recovery operation control means 21 starts the heat recovery operation.
しかしながら、前記従来の構成では、熱回収前や熱回収中など、回収の動作に関する情報は使用者へ提示されるが、熱回収を行った結果としての効果が表示されないため、使用者は、どの程度熱回収を行ったのか確認できないという課題を有していた。 However, in the conventional configuration, information related to the recovery operation such as before heat recovery or during heat recovery is presented to the user, but since the effect as a result of the heat recovery is not displayed, the user There was a problem that it was not possible to confirm whether or not heat recovery was performed.
本発明は、前記従来の課題を解決するもので、使用者が熱回収運転の効果を確認できる給湯装置を提供することを目的とする。 This invention solves the said conventional subject, and it aims at providing the hot-water supply apparatus with which a user can confirm the effect of heat recovery driving | operation.
前記従来の課題を解決するために、本発明の給湯装置は、貯湯槽と、浴槽と、前記貯湯槽内の湯水と前記浴槽内の湯水とを熱交換する熱交換器と、前記浴槽内の湯水が前記熱交換器を介して循環する浴槽水循環配管と、前記浴槽水循環配管に配設された第2の搬送ポンプと、前記貯湯槽の下部の湯水を前記熱交換器に導く熱回収往き管と、前記熱交換器から湯水を前記貯湯槽に戻す熱交戻り管と、前記貯湯槽から前記熱交換器を介して湯水を循環させる第1の搬送ポンプと、表示手段と、制御手段とを備え、前記第1の搬送ポンプと前記第2の搬送ポンプとを動作させることで、前記熱交換器により前記浴槽の湯が有する熱を前記貯湯槽の湯水に回収する熱回収運転モードを含み、前記制御手段は、前記浴槽の湯量を検知して前記熱回収運転の実行を判断し、また、前記貯湯槽内の湯水を加熱する場合には、前記貯湯槽の下部の湯水をヒートポンプユニットにて加熱し、前記貯湯槽の上部に戻す沸き上げ運転を実行する温度成層型の給湯装置において、前記熱回収運転中の、前記第2の搬送ポンプによる湯水の搬送量は前記第1の搬送ポンプによる湯水の搬送量よりも多いとともに、前記熱回収運転における熱回収量に関する情報を前記表示手段に表示する構成としたことを特徴とするものである。 In order to solve the conventional problem, a hot water supply apparatus of the present invention includes a hot water storage tank, a bathtub, a heat exchanger for exchanging heat between the hot water in the hot water tank and the hot water in the bathtub, A bathtub water circulation pipe through which hot water circulates through the heat exchanger, a second transfer pump disposed in the bathtub water circulation pipe, and a heat recovery forward pipe that guides hot water in the lower part of the hot water tank to the heat exchanger A heat exchange return pipe for returning hot water from the heat exchanger to the hot water storage tank, a first transfer pump for circulating hot water from the hot water storage tank through the heat exchanger, display means, and control means. A heat recovery operation mode for recovering the heat of the hot water in the bathtub to the hot water in the hot water tank by the heat exchanger by operating the first transport pump and the second transport pump, The control means detects the amount of hot water in the bathtub and performs the heat recovery operation. Determining the execution, also said in the case of heating the hot water of the hot water storage tank is a hot water at the bottom of the hot water tank heated at the heat pump unit, the temperature stratification to perform heating operation back to the top of the hot water storage tank In the hot water supply device of the type, the amount of hot water transported by the second transport pump during the heat recovery operation is larger than the amount of hot water transported by the first transport pump, and the heat recovery amount in the heat recovery operation The information is displayed on the display means.
これにより、使用者は、熱回収運転の効果を確認することができる。 Thereby, the user can confirm the effect of the heat recovery operation.
本発明によれば、使用者が熱回収運転の効果を確認できる給湯装置を提供できる。 ADVANTAGE OF THE INVENTION According to this invention, the hot water supply apparatus with which a user can confirm the effect of heat recovery driving | operation can be provided.
第1の発明は、貯湯槽と、浴槽と、前記貯湯槽内の湯水と前記浴槽内の湯水とを熱交換する熱交換器と、前記浴槽内の湯水が前記熱交換器を介して循環する浴槽水循環配管と、前記浴槽水循環配管に配設された第2の搬送ポンプと、前記貯湯槽の下部の湯水を前記熱交換器に導く熱回収往き管と、前記熱交換器から湯水を前記貯湯槽に戻す熱交戻り管と、前記貯湯槽から前記熱交換器を介して湯水を循環させる第1の搬送ポンプと、表示手段と、制御手段とを備え、前記第1の搬送ポンプと前記第2の搬送ポンプとを動作させることで、前記熱交換器により前記浴槽の湯が有する熱を前記貯湯槽の湯水に回収する熱回収運転モードを含み、前記制御手段は、前記浴槽の湯量を検知して前記熱回収運転の実行を判断し、また、前記貯湯槽内の湯水を加熱する場合には、前記貯湯槽の下部の湯水をヒートポンプユニットにて加熱し、前記貯湯槽の上部に戻す沸き上げ運転を実行する温度成層型の給湯装置において、前記熱回収運転中の、前記第2の搬送ポンプによる湯水の搬送量は前記第1の搬送ポンプによる湯水の搬送量よりも多いとともに、前記熱回収運転における熱回収量に関する情報を前記表示手段に表示する構成としたことを特徴とする給湯装置で、熱回収量に関する情報を表示することにより、使用者は、熱回収運転の効果を確認することができる。 1st invention is a hot water tank, a bathtub, the heat exchanger which heat-exchanges the hot water in the said hot water tank, and the hot water in the said bathtub, and the hot water in the said bathtub circulates through the said heat exchanger. Bath water circulation pipe, a second transport pump disposed in the bathtub water circulation pipe, a heat recovery forward pipe for guiding hot water in the lower part of the hot water tank to the heat exchanger, and hot water from the heat exchanger A heat exchange return pipe returning to the tank; a first transport pump for circulating hot water from the hot water storage tank through the heat exchanger; a display means; and a control means, the first transport pump and the first transport pump. And a heat recovery operation mode for recovering the heat of the hot water of the bathtub into the hot water of the hot water storage tank by operating the transfer pump, and the control means detects the amount of hot water of the bathtub. and determining the execution of the heat recovery operation, the addition, hot water of the hot water storage tank In the temperature stratification type hot water supply apparatus for performing the heating operation for heating the hot water in the lower part of the hot water tank with a heat pump unit and returning it to the upper part of the hot water tank, The amount of hot water transported by the second transport pump is larger than the amount of hot water transported by the first transport pump, and information related to the heat recovery amount in the heat recovery operation is displayed on the display means. By displaying information on the amount of heat recovery with the hot water supply device, the user can confirm the effect of the heat recovery operation.
第2の発明は、前記熱回収運転停止後の前記ヒートポンプユニットの加熱運転時における入力が略最小となるように、前記熱回収運転を停止させることを特徴とする給湯装置である。 A second aspect of the present invention is the hot water supply apparatus, wherein the heat recovery operation is stopped so that an input during the heating operation of the heat pump unit after the heat recovery operation is stopped is substantially minimized.
これにより、熱回収運転中の貯湯槽の温度分布に基づき、加熱手段によって所定の貯湯量を沸き上げるための消費熱量(消費電力)が最小となる時点を判断して、熱回収運転を停止するので、本来の目的であるシステム全体としての効率向上を実現し、省エネルギー性を高める効果がある。 Thus, based on the temperature distribution of the hot water storage tank during the heat recovery operation, the time point at which the heat consumption (power consumption) for boiling up the predetermined hot water storage amount by the heating means is judged to be minimum, and the heat recovery operation is stopped. Therefore, it is possible to improve the efficiency of the entire system, which is the original purpose, and to improve energy saving.
第3の発明は、前記貯湯槽に接続された給水管と、前記貯湯槽の高温水を供給するように接続された高温水供給管と、前記貯湯槽内の略上部の湯が前記熱交換器に流れるように切換手段を介して前記熱交換器に接続された熱交往き管と、前記ヒートポンプユニットにて加熱された湯水が前記貯湯槽内に戻るように、前記切換手段から前記貯湯槽に接続された沸き上げ戻り管とを備え、前記熱回収往き管は、前記貯湯槽の略下部の湯水が前記熱交換器に流れるように、前記ヒートポンプユニット、前記切換手段を順に介して前記熱交換器に接続されており、前記熱回収運転を行うときには、前記熱回収往き管、前記ヒートポンプユニット、前記切換手段、前記熱交換器、前記熱交戻り管の順に前記貯湯槽からの湯水が流れるように、また、前記ヒートポンプユニットにより前記貯湯槽内の湯水を加熱する沸き上げ運転を行うときには、前記熱回収往き管、前記ヒートポンプユニット、前記切換手段、前記沸き上げ戻り管の順に前記貯湯槽からの湯が流れるように、前記切換手段を切り換える構成としたことを特徴とする給湯装置である。 According to a third aspect of the present invention, a water supply pipe connected to the hot water storage tank, a high temperature water supply pipe connected to supply high temperature water in the hot water storage tank, and hot water in a substantially upper part of the hot water storage tank are used for the heat exchange. A heat transfer pipe connected to the heat exchanger via the switching means so as to flow to the storage device, and the hot water heated by the heat pump unit from the switching means to the hot water storage tank. A heating return pipe connected to the heat recovery pipe, and the heat recovery forward pipe passes through the heat pump unit and the switching means in order so that hot water at a substantially lower part of the hot water tank flows to the heat exchanger. When the heat recovery operation is performed when connected to an exchanger, hot water from the hot water tank flows in the order of the heat recovery forward pipe, the heat pump unit, the switching means, the heat exchanger, and the heat exchange return pipe. And also said When performing a heating operation in which hot water in the hot water storage tank is heated by a heat pump unit, hot water from the hot water storage tank flows in the order of the heat recovery forward pipe, the heat pump unit, the switching means, and the boiling return pipe. Further, the present invention is a hot water supply apparatus characterized in that the switching means is switched.
これにより、熱回収時に使用する配管の一部を、貯湯槽内の湯水の沸き上げ運転時にも使用する構成とすることができ、低コスト化を実現した給湯装置を提供できる。 Thereby, a part of piping used at the time of heat recovery can be used also at the time of the boiling operation of the hot water in the hot water storage tank, and the hot water supply apparatus which implement | achieved cost reduction can be provided.
以下、本発明の実施の形態について、図面を参照しながら説明する。なお、この実施の形態によって本発明が限定されるものではない。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.
(実施の形態1)
図1は本発明の実施の形態1における給湯装置の構成を示す図である。
(Embodiment 1)
FIG. 1 is a diagram showing a configuration of a hot water supply apparatus according to Embodiment 1 of the present invention.
図1において、給湯装置は、貯湯槽1と、この貯湯槽1の水を加熱する加熱手段としてのヒートポンプユニット2と、熱回収を行う対象の浴槽3と、浴槽3の水と貯湯槽1の水とを熱交換するように構成された熱交換器4と、貯湯槽1に接続された給水管14と、貯湯槽1の略上部に接続された第1の出湯管22と、第1の出湯管22と給水管14とが接続された位置の間、すなわち、高さ方向において貯湯槽1の胴部略中央部に接続された第2の出湯管23とから構成されている。 In FIG. 1, a hot water supply apparatus includes a hot water tank 1, a heat pump unit 2 as a heating means for heating the water in the hot water tank 1, a bathtub 3 to be subjected to heat recovery, water in the bathtub 3, and the hot water tank 1. A heat exchanger 4 configured to exchange heat with water, a water supply pipe 14 connected to the hot water tank 1, a first hot water pipe 22 connected to substantially the upper part of the hot water tank 1, and a first It is comprised from the position where the hot water pipe 22 and the water supply pipe 14 were connected, ie, the 2nd hot water pipe 23 connected to the trunk | drum approximate center part of the hot water storage tank 1 in the height direction.
また、給湯装置は、第1の出湯管22と第2の出湯管23とが入口側に接続された高温水混合弁24と、この高温水混合弁24の出口側に接続され、貯湯槽1内の高温水を供給する高温水供給管8と、給水管14から分岐され、貯湯槽1内または給水管14からの低温水を供給する低温水供給管9と、これら高温水供給管8と低温水供給管9とを入口側に接続された混合弁11と、この混合弁11の出口側に接続された給湯管10と、給湯管10の途中に接続された開閉弁13と、開閉弁13の上流で分岐して熱交換器4の第1の流路に接続された給湯分岐管15と、熱交換器4で浴槽3の水と熱交換した貯湯槽1の水を再び貯湯槽1へ戻すように、高さ方向において熱交換器4の第1の出湯管22と第2の出湯管23との間の位置に貯湯槽1とに接続された熱交戻り管16とから構成されている。 The hot water supply device is connected to the high temperature water mixing valve 24 in which the first hot water discharge pipe 22 and the second hot water discharge pipe 23 are connected to the inlet side, and to the outlet side of the high temperature water mixing valve 24. A high-temperature water supply pipe 8 for supplying high-temperature water therein, a low-temperature water supply pipe 9 branched from the water supply pipe 14 and supplying low-temperature water in the hot water tank 1 or from the water supply pipe 14, and these high-temperature water supply pipes 8 A mixing valve 11 connected to the inlet side of the low-temperature water supply pipe 9, a hot water supply pipe 10 connected to the outlet side of the mixing valve 11, an on-off valve 13 connected in the middle of the hot water pipe 10, and an on-off valve The hot water branch pipe 15 branched upstream of 13 and connected to the first flow path of the heat exchanger 4, and the water in the hot water tank 1 that exchanged heat with the water in the bathtub 3 in the heat exchanger 4 are again stored in the hot water tank 1. The hot water storage tank is located at a position between the first hot water discharge pipe 22 and the second hot water discharge pipe 23 of the heat exchanger 4 in the height direction so as to return to And a connected thermal 交戻 Ri tube 16. in and.
さらに、給湯装置は、貯湯槽1と熱交換器4の第1の流路内の水を循環させる第1の搬送ポンプとしての貯湯槽水搬送ポンプ5aと、熱交換器4の第2の流路内へ浴槽3の水が循環するように接続された浴槽水循環配管12と、浴槽3と熱交換器4の第2の流路内の水を循環させる第2の搬送ポンプとしての浴槽水搬送ポンプ5bとから構成されている。 Furthermore, the hot water supply device includes a hot water tank water transfer pump 5a as a first transfer pump that circulates water in the first flow path of the hot water tank 1 and the heat exchanger 4, and a second flow of the heat exchanger 4. Bathtub water conveyance as a second conveyance pump for circulating water in the second flow path of the bathtub 3 and the heat exchanger 4 and the bathtub water circulation pipe 12 connected so that the water of the bathtub 3 circulates in the road And a pump 5b.
ここで熱交戻り管16は、貯湯槽1の上下方向において第1の出湯管22と第2の出湯
管23の間の位置で貯湯槽1に接続される。また、給湯管10は、浴槽水循環配管12の途中に接続し、浴槽3への給湯の際はこの浴槽水循環配管12を利用する。
Here, the heat exchange return pipe 16 is connected to the hot water tank 1 at a position between the first hot water pipe 22 and the second hot water pipe 23 in the vertical direction of the hot water tank 1. Moreover, the hot water supply pipe 10 is connected in the middle of the bathtub water circulation pipe 12, and this hot water supply pipe 12 is used when hot water is supplied to the bathtub 3.
また、浴室内に設置されたリモコン25には、使用者が任意に熱回収運転を起動するための熱回収運転起動スイッチ26を設け、浴槽水循環配管12には、浴槽湯量検知手段として水圧を測定することにより浴槽3の湯の水位を検知する水位センサ27と、浴槽3の水温を検知するための浴槽水温検知手段17とを設けており、貯湯槽1には、貯湯槽1内の水温を検知するための複数の貯湯温検知手段28a〜28eを設けている。 The remote controller 25 installed in the bathroom is provided with a heat recovery operation start switch 26 for the user to arbitrarily start the heat recovery operation, and the bathtub water circulation pipe 12 measures the water pressure as a bath water amount detection means. Thus, a water level sensor 27 for detecting the water level of the hot water in the bathtub 3 and a bathtub water temperature detecting means 17 for detecting the water temperature of the bathtub 3 are provided, and the water temperature in the hot water tank 1 is set in the hot water tank 1. Several hot water storage temperature detection means 28a-28e for detecting are provided.
さらに、これら複数の貯湯温検知手段28a〜28eと水位センサ27と浴槽水温検知手段17の出力および熱回収運転起動スイッチ26の操作に基づいて、浴槽3への給湯およびそれ以降予め設定された時間だけ浴槽水の保温と水量維持を行う風呂自動運転を制御する給湯制御手段としての風呂自動運転制御手段29と、浴槽3内の水を加熱する追い焚き運転を制御する追い焚き運転制御手段30と、貯湯槽1に浴槽3の水の熱を回収する熱回収運転を制御する熱回収運転制御手段21とからなる運転制御手段18を設けている。 Furthermore, based on the outputs of the plurality of hot water storage temperature detection means 28a to 28e, the water level sensor 27, the bath water temperature detection means 17 and the operation of the heat recovery operation start switch 26, the hot water supply to the bathtub 3 and the time set in advance thereafter Only bath automatic operation control means 29 as hot water supply control means for controlling automatic bath operation for maintaining the temperature of the bathtub water and maintaining the amount of water, and reheating operation control means 30 for controlling the reheating operation for heating the water in the bathtub 3. The hot water storage tank 1 is provided with operation control means 18 including heat recovery operation control means 21 for controlling the heat recovery operation for recovering the heat of the water in the bathtub 3.
図2は熱回収運転制御手段21のブロック図を示し、水位センサ27の出力および風呂自動運転制御手段29の動作状態あるいは熱回収運転制御手段21で予め設定された熱回収運転の開始時刻、さらには熱回収運転起動スイッチ26などから熱回収運転の開始を判断する熱回収運転開始判断部31と、ヒートポンプユニット2による沸上運転を制御する沸上運転制御手段(図示せず)から貯湯後の給湯利用に必要な貯湯熱量を取得する所要貯湯熱量取得部32と、貯湯温検知手段28a〜28eにより貯湯温度分布を測定する貯湯温度分布測定部33と、これら所要貯湯熱量取得部32と貯湯温度分布測定部33で得ら測定部33による現在の温度分布と必要沸上熱量算出部34から沸上完了時の温度分布を推定する沸上完了時貯湯温度分布推定部35とからなる。 FIG. 2 shows a block diagram of the heat recovery operation control means 21, wherein the output of the water level sensor 27 and the operating state of the bath automatic operation control means 29 or the start time of the heat recovery operation preset by the heat recovery operation control means 21, Is a heat recovery operation start determination unit 31 that determines the start of the heat recovery operation from the heat recovery operation start switch 26 and the like, and a boiling operation control means (not shown) that controls the boiling operation by the heat pump unit 2. The required hot water storage amount acquisition unit 32 for acquiring the hot water storage amount necessary for hot water use, the hot water temperature distribution measurement unit 33 for measuring the hot water temperature distribution by the hot water temperature detection means 28a to 28e, the required hot water storage amount acquisition unit 32 and the hot water temperature. The current temperature distribution obtained by the measurement unit 33 obtained by the distribution measurement unit 33 and the temperature distribution at the completion of boiling from the required boiling heat amount calculation unit 34 are estimated. It consists of estimating unit 35..
さらに、貯湯温度分布測定部33による現在の温度分布から沸上完了時貯湯温度分布推定部35での沸き上げ完了時の推定温度分布に至る間のヒートポンプユニット2への入力を推定する沸上所要入力推定部36と、この沸上所要入力推定部36による入力推定値の時間変化に基づいて貯湯槽水搬送ポンプ5a、浴槽水搬送ポンプ5bとを制御するポンプ制御部37とからなる。 Further, the boiling required for estimating the input to the heat pump unit 2 from the current temperature distribution by the hot water storage temperature distribution measuring unit 33 to the estimated temperature distribution at the completion of boiling by the hot water storage temperature distribution estimating unit 35 at the completion of boiling. The input estimation part 36 and the pump control part 37 which controls the hot water tank water conveyance pump 5a and the bathtub water conveyance pump 5b based on the time change of the input estimated value by this boiling required input estimation part 36 are comprised.
以上のように構成された給湯装置について、以下その動作、作用を説明する。 About the hot water supply apparatus comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.
一般的な家庭での湯の利用における基本的な動作として、朝には貯湯槽1にその日使う分の湯が貯えられており、活動している時間帯に順次給湯に利用される。給湯利用中に貯湯量が不足する場合には必要に応じてヒートポンプユニット2を運転し、追加で貯湯運転を行うこともある。 As a basic operation in the use of hot water in a general home, hot water for the day is stored in the hot water tank 1 in the morning, and is sequentially used for hot water supply during an active time. When the amount of hot water storage is insufficient during use of hot water, the heat pump unit 2 may be operated as necessary, and an additional hot water storage operation may be performed.
近年では、浴槽3への給湯から保温までを自動で行う風呂自動運転の機能を備えている給湯装置が多くなっている。風呂自動運転制御手段29により浴槽3への給湯および保温運転を行う場合は、貯湯槽1内に貯えられている湯を用いて浴槽3へ給湯し、浴槽水温が低下した場合には、貯湯槽1内に貯えられている湯の熱を利用して保温運転をおこない、浴槽水温を予め設定された温度に保つ。また、追い焚き運転制御手段30により追い焚き運転をおこなって浴槽3内の湯を加温する場合も、貯湯槽1内に貯えられている湯の熱を利用して行う。 In recent years, there have been an increasing number of hot water supply apparatuses having a function of automatic bath operation that automatically performs from hot water supply to the bathtub 3 to heat insulation. When the bath automatic operation control means 29 performs hot water supply to the bathtub 3 and heat insulation operation, the hot water stored in the hot water storage tank 1 is used to supply hot water to the bathtub 3, and when the bath water temperature decreases, the hot water storage tank A heat insulation operation is performed using the heat of hot water stored in 1, and the bath water temperature is maintained at a preset temperature. In addition, when the reheating operation is performed by the reheating operation control means 30 and the hot water in the bathtub 3 is heated, the heat of the hot water stored in the hot water tank 1 is used.
これら一日の給湯などの熱利用が終わる時点で貯湯槽1内の湯は大部分が給水と置換され、その後の深夜に再び次の利用のための貯湯運転がおこなわれる。このとき、入浴のために浴槽3に供給された湯は、給湯利用終了時には貯湯槽1内の水温に対して比較的高温
で残されていることが多いので、熱回収運転制御手段21が、ヒートポンプユニット2による深夜の沸上運転の前、あるいは運転中に熱回収運転をおこなって貯湯槽1内に熱を回収する。
Most of the hot water in the hot water storage tank 1 is replaced with hot water at the time when heat use such as hot water supply for one day is finished, and hot water storage operation for the next use is performed again at midnight thereafter. At this time, the hot water supplied to the bathtub 3 for bathing is often left at a relatively high temperature with respect to the water temperature in the hot water tank 1 at the end of use of the hot water supply. A heat recovery operation is performed before or during the midnight boiling operation by the heat pump unit 2 to recover heat in the hot water tank 1.
次に、風呂自動運転、追い焚き運転、および熱回収運転の制御方法について説明する。風呂自動運転制御手段29は、浴槽3へ所定量の湯を所定温度で自動で給湯し、その後、浴槽水温を予め設定された時間だけ予め設定された温度に保つように間欠的に保温動作を行う(風呂自動運転)。 Next, a control method for bath automatic operation, chasing operation, and heat recovery operation will be described. The bath automatic operation control means 29 automatically supplies a predetermined amount of hot water to the bathtub 3 at a predetermined temperature, and then intermittently performs a heat retaining operation so as to maintain the bath water temperature at a preset temperature for a preset time. Perform (automatic bath operation).
風呂自動運転をおこなっている間は、保温動作を行う必要があるかないかを判断するために、定期的に浴槽湯温を検出するための浴槽湯温検知動作を行う。浴槽水温の検知は浴槽水温検知手段17でおこない、その結果、浴槽水温が予め設定された温度より所定温度以上(例えば1K以上)低い場合には、保温運転をおこなって浴槽水温を保ち、所定温度未満の場合には、保温運転をおこなわない。 During bath automatic operation, in order to determine whether or not it is necessary to perform a heat retaining operation, a bath water temperature detecting operation is periodically performed to detect the bath water temperature. The bath water temperature is detected by the bath water temperature detection means 17, and as a result, when the bath water temperature is lower than a preset temperature by a predetermined temperature or more (for example, 1K or more), a heat insulation operation is performed to maintain the bath water temperature. If it is less than 1, do not keep warm.
この予め設定された時間内は、風呂自動運転を優先とし、熱回収運転制御手段21が自動で、あるいは使用者による熱回収運転起動スイッチ26の操作で熱回収運転開始の指示を受けても熱回収運転を行わず、予め設定された時間が経過した後に、熱回収運転を行うように制御する。 During this preset time, automatic bath operation is prioritized and the heat recovery operation control means 21 is automatically operated or the heat recovery operation start switch 26 is operated by the user even when receiving an instruction to start the heat recovery operation. Control is performed so that the heat recovery operation is performed after a preset time has elapsed without performing the recovery operation.
逆に、熱回収運転中に風呂自動運転制御手段29が風呂自動運転開始の指示を受けた場合には、風呂自動運転を優先として、熱回収運転制御手段21は熱回収運転を停止し、風呂自動運転制御手段29が風呂自動運転を開始する(図3に概念図を示す)。 On the contrary, when the bath automatic operation control means 29 receives an instruction to start the bath automatic operation during the heat recovery operation, the heat recovery operation control means 21 stops the heat recovery operation, giving priority to the bath automatic operation. The automatic operation control means 29 starts bath automatic operation (conceptual diagram is shown in FIG. 3).
追い焚き運転制御手段30は、浴槽3内の湯を循環加温し、浴槽水温検知手段17が検知する浴槽水温が所定の温度になる、または動作開始から所定の時間経過すると終了する(追い焚き運転)。 The reheating operation control means 30 circulates and warms the hot water in the bathtub 3 and ends when the bath water temperature detected by the bath water temperature detection means 17 reaches a predetermined temperature or when a predetermined time elapses from the start of the operation (refreshing). operation).
追い焚き運転制御手段30が追い焚き運転をおこなっている間は、追い焚き運転を優先とし、熱回収運転制御手段21は熱回収運転をおこなわず、追い焚き運転が終了した後に、熱回収運転を行うように制御する。 While the reheating operation control means 30 is performing the reheating operation, the renewal operation is prioritized, the heat recovery operation control means 21 does not perform the heat recovery operation, and after the reheating operation is completed, the heat recovery operation is performed. Control to do.
逆に、熱回収運転中に追い焚き運転制御手段30が追い焚き運転の指示を受けた場合にも、追い焚き運転を優先として、熱回収運転制御手段21は熱回収運転を停止し、追い焚き運転制御手段30が追い焚き運転を開始する(図4に概念図を示す)。 Conversely, even when the reheating operation control means 30 receives an instruction for reheating operation during the heat recovery operation, the recuperation operation is given priority, and the heat recovery operation control means 21 stops the heat recovery operation and retreats. The operation control means 30 starts a chasing operation (a conceptual diagram is shown in FIG. 4).
各々の運転を行う場合の弁およびポンプの動作と、それに伴う水および湯の流れについて図5〜図8を用いて説明する。図中、流れのある経路は太線で示してある。 The operation of the valve and the pump when performing each operation and the flow of water and hot water associated therewith will be described with reference to FIGS. In the figure, the flow path is indicated by a bold line.
まず、風呂自動運転制御手段29が風呂自動運転を行うときの動作について説明する。最初に浴槽3へ給湯を行う場合における回路中の水および湯の流れを図5に示す。貯湯槽1からは、第1の出湯管22と第2の出湯管23からの湯を高温水混合弁24で混合して高温水供給管8へ供給する。 First, the operation when the bath automatic operation control means 29 performs bath automatic operation will be described. FIG. 5 shows the flow of water and hot water in the circuit when hot water is first supplied to the bathtub 3. From the hot water storage tank 1, hot water from the first hot water discharge pipe 22 and the second hot water discharge pipe 23 is mixed by the high temperature water mixing valve 24 and supplied to the high temperature water supply pipe 8.
この高温水供給管8に供給された湯と給水管14から低温水供給管9へと供給される給水とが混合弁11にて給湯所望温度の湯に混合され、給湯管10へと供給される。ここで、高温水混合弁24から高温水供給管8に供給される湯の温度は、上記の給湯所望温度よりも所定温度以上高い温度(たとえば給湯所望温度が40℃の場合に45℃以上)に調節されている。 The hot water supplied to the high-temperature water supply pipe 8 and the water supplied from the water supply pipe 14 to the low-temperature water supply pipe 9 are mixed with hot water having a desired hot water supply temperature by the mixing valve 11 and supplied to the hot water supply pipe 10. The Here, the temperature of the hot water supplied from the high-temperature water mixing valve 24 to the high-temperature water supply pipe 8 is a temperature higher than the above-mentioned desired hot water supply temperature by a predetermined temperature or more (for example, 45 ° C. or more when the desired hot water supply temperature is 40 ° C.). It is adjusted to.
開閉弁13は開かれ、給湯管10へと供給された所望温度の湯は、浴槽水循環配管12より浴槽3へと給湯される。なお、高温水混合弁24と混合弁11の開度は、それぞれ出口側に接続された高温水供給管8と給湯管10に供給される湯の温度に基づいてフィードバック制御されるのが一般的であり、高温水混合弁24については第1の出湯管22と第2の出湯管からの湯、混合弁11については高温水供給管8からの湯と低温水供給管9からの給水の温度により変化する。 The on-off valve 13 is opened, and hot water having a desired temperature supplied to the hot water supply pipe 10 is supplied to the bathtub 3 from the bathtub water circulation pipe 12. The opening degree of the high temperature water mixing valve 24 and the mixing valve 11 is generally feedback controlled based on the temperature of hot water supplied to the high temperature water supply pipe 8 and the hot water supply pipe 10 respectively connected to the outlet side. For the high temperature water mixing valve 24, the hot water from the first outlet pipe 22 and the second outlet pipe, and for the mixing valve 11, the hot water from the high temperature water supply pipe 8 and the temperature of the feed water from the low temperature water supply pipe 9. It depends on.
浴槽3内の湯を保温する場合における回路中の水および湯の流れを図6に示す。貯湯槽水搬送ポンプ5aと浴槽水搬送ポンプ5bとが運転を開始し、貯湯槽水搬送ポンプ5aの運転により、貯湯槽1の略上部より第1の出湯管22から高温水混合弁24を経て高温水供給管8へと湯が供給され、さらに混合弁11を経て給湯管10へと供給される。 FIG. 6 shows the flow of water and hot water in the circuit when the hot water in the bathtub 3 is kept warm. The hot water storage tank water transfer pump 5a and the bathtub water transfer pump 5b start operation, and the hot water storage tank water transfer pump 5a starts operation from the upper part of the hot water storage tank 1 through the first hot water discharge pipe 22 through the high temperature water mixing valve 24. Hot water is supplied to the hot water supply pipe 8 and further supplied to the hot water supply pipe 10 via the mixing valve 11.
このとき、開閉弁13を閉じ、給湯管10へと供給された湯は、給湯分岐管15へと供給され、熱交換器4にて浴槽水循環配管12を循環する浴槽3の湯を加熱して、浴槽水温を上昇させる。一方、熱交換器4を出て比較的低温となった湯は熱交戻り管16を経て貯湯槽1へと還流する。このとき、高温水混合弁24と混合弁11の開度は、それぞれ第1の出湯管22と高温水供給管8側が全開となり、貯湯槽1上部の高温の湯が熱交換器4に供給されるように制御されるのが一般的であるが、第2の出湯管23と低温水供給管9より一定量の湯または水が流入して混合するものであってもよい。 At this time, the on-off valve 13 is closed and the hot water supplied to the hot water supply pipe 10 is supplied to the hot water supply branch pipe 15 to heat the hot water in the bathtub 3 circulating through the bathtub water circulation pipe 12 in the heat exchanger 4. Increase the bath water temperature. On the other hand, the hot water that has left the heat exchanger 4 and has become relatively cold returns to the hot water tank 1 through the heat exchange return pipe 16. At this time, the opening degree of the high temperature water mixing valve 24 and the mixing valve 11 is such that the first hot water outlet pipe 22 and the high temperature water supply pipe 8 side are fully opened, and the hot water in the upper part of the hot water tank 1 is supplied to the heat exchanger 4. It is generally controlled so that a certain amount of hot water or water flows from the second hot water outlet pipe 23 and the low temperature water supply pipe 9 and mixes them.
浴槽3内の水温を検知するための浴槽水温検知動作を行う場合における回路中の水および湯の流れを図7に示す。浴槽水搬送ポンプ5bが運転を開始し、浴槽水循環配管12内を浴槽3内の湯が循環する。このとき、開閉弁13を閉じ、貯湯槽水搬送ポンプ5aは運転をおこなわない。浴槽水温検知手段17が浴槽水温を検知し、保温動作をするかしないかを判断する。 FIG. 7 shows the flow of water and hot water in the circuit when the bathtub water temperature detection operation for detecting the water temperature in the bathtub 3 is performed. The bathtub water conveyance pump 5b starts operation, and the hot water in the bathtub 3 circulates in the bathtub water circulation pipe 12. At this time, the on-off valve 13 is closed and the hot water tank water transfer pump 5a does not operate. The bathtub water temperature detection means 17 detects the bathtub water temperature and determines whether or not to perform a heat retaining operation.
次に、追い焚き運転制御手段30が追い焚き運転を行う場合の動作であるが、追い焚き運転を行う場合における回路中の水および湯の流れは風呂自動運転制御手段29が保温動作を行う場合と同じで図6に示す通りであるので省略する。 Next, the operation when the reheating operation control means 30 performs the reheating operation, the flow of water and hot water in the circuit when the reheating operation is performed, when the bath automatic operation control means 29 performs the heat retaining operation. Since this is the same as shown in FIG.
最後に、熱回収運転制御手段21が、浴槽3に残された湯の熱回収運転を行う場合における回路中の水および湯の流れを図8に示す。熱回収運転を開始すると、貯湯槽水搬送ポンプ5aの運転により、貯湯槽1の略下部より低温水供給管9へと水が供給され、混合弁11を経て給湯管10へと供給される。 Finally, FIG. 8 shows the flow of water and hot water in the circuit when the heat recovery operation control means 21 performs the heat recovery operation of the hot water remaining in the bathtub 3. When the heat recovery operation is started, water is supplied from a substantially lower portion of the hot water tank 1 to the low-temperature water supply pipe 9 by the operation of the hot water tank water transfer pump 5 a, and supplied to the hot water supply pipe 10 through the mixing valve 11.
このとき、開閉弁13を閉じ、給湯管10へと供給された水は、給湯分岐管15へと供給され、熱交換器4にて浴槽水循環配管12を循環する浴槽3の湯と熱交換をおこなって熱を回収する。一方、熱交換器4を出て比較的高温となった水は熱交戻り管16を経て貯湯槽1へと還流する。このとき、混合弁11の開度は、低温水供給管9側が全開となるように制御されるのが一般的であるが、高温水供給管8より一定量の湯が流入し混合するものであってもよい。 At this time, the on-off valve 13 is closed, and the water supplied to the hot water supply pipe 10 is supplied to the hot water supply branch pipe 15 and exchanges heat with the hot water of the bathtub 3 circulating through the bathtub water circulation pipe 12 in the heat exchanger 4. To recover heat. On the other hand, the water that has left the heat exchanger 4 and has reached a relatively high temperature returns to the hot water tank 1 through the heat exchange return pipe 16. At this time, the opening degree of the mixing valve 11 is generally controlled so that the low temperature water supply pipe 9 side is fully opened, but a certain amount of hot water flows from the high temperature water supply pipe 8 and mixes. There may be.
なお、熱回収運転での熱交換器4における熱回収量として、熱回収運転時に、貯湯槽1から熱交換器4に流入する湯の温度を検出する温度検出手段55aと、熱交換器4から貯湯槽1に戻る湯の温度を検出する温度検出手段55bの温度差と、貯湯槽水搬送ポンプ5aを流れる流量とを積算することで、熱回収運転での熱交換器4における熱回収量が算出できる。 Note that, as the heat recovery amount in the heat exchanger 4 in the heat recovery operation, the temperature detection means 55a for detecting the temperature of hot water flowing into the heat exchanger 4 from the hot water tank 1 and the heat exchanger 4 during the heat recovery operation. By integrating the temperature difference of the temperature detecting means 55b for detecting the temperature of hot water returning to the hot water tank 1 and the flow rate flowing through the hot water tank water transfer pump 5a, the amount of heat recovered in the heat exchanger 4 in the heat recovery operation is increased. It can be calculated.
熱回収運転をおこなった場合の貯湯槽1内の温度分布は図9に示す38、39、40の順に変化する。つまり、浴槽3と熱交換されて熱交戻り管16から貯湯槽1に流入する水
41の温度は貯湯槽1の貯湯温よりも低い場合が多く、貯湯槽水搬送ポンプ5aの作用によって貯湯槽1の湯と混合しつつ貯湯槽1の下方に向けて移動する。
The temperature distribution in the hot water tank 1 when the heat recovery operation is performed changes in the order of 38, 39, and 40 shown in FIG. That is, the temperature of the water 41 that exchanges heat with the bathtub 3 and flows into the hot water tank 1 from the heat exchange return pipe 16 is often lower than the hot water temperature of the hot water tank 1, and the hot water tank is caused by the action of the hot water tank water transfer pump 5a. It moves toward the lower side of the hot water tank 1 while being mixed with the hot water of No. 1.
第2の出湯管23の接続位置は熱交戻り管16の接続位置よりも下部にあるので、給湯が発生すると、下がってきた中温の水42を第2の出湯管23から出湯し、第1の出湯管からの高温水43と混合して利用することができる。図3に示す44は、熱回収後に給湯が発生した場合の温度分布を示している。このように第2の出湯管23が熱交戻り管16の貯湯槽への接続位置よりも下にあることで、回収した熱を効果的に利用することができる。 Since the connection position of the second hot water discharge pipe 23 is below the connection position of the heat exchanger return pipe 16, when hot water is generated, the medium temperature water 42 that has come down is discharged from the second hot water discharge pipe 23, and the first It can be used by mixing with hot water 43 from the hot water outlet pipe. Reference numeral 44 shown in FIG. 3 indicates a temperature distribution when hot water is generated after heat recovery. Thus, since the 2nd hot water discharge pipe 23 exists below the connection position to the hot water storage tank of the heat exchange return pipe 16, the collect | recovered heat | fever can be utilized effectively.
給湯の発生が比較的少なく、使い切れないで残った中温の水は、ヒートポンプユニット2で再加熱して利用することになるが、ヒートポンプユニット2の運転効率は、図10に示すように加熱前の水温が高いほど低下する。 The occurrence of hot water supply is relatively small, and the medium-temperature water that remains without being used up is reheated and used by the heat pump unit 2, but the operating efficiency of the heat pump unit 2 is as shown in FIG. The higher the water temperature, the lower it.
図9に示した貯湯槽1の温度分布からわかるように、熱回収運転後のヒートポンプユニット2による必要加熱量は、浴槽3からの回収熱量が増加するほど少なくなるものの、それと同時にヒートポンプユニット2で加熱する前の水温は高くなって、再加熱時の運転効率は低下するので、できるだけ多くの熱回収を行うことが必ずしも省エネルギーにつながらない。 As can be seen from the temperature distribution of the hot water tank 1 shown in FIG. 9, the required heating amount by the heat pump unit 2 after the heat recovery operation decreases as the amount of recovered heat from the bathtub 3 increases. Since the water temperature before heating becomes high and the operation efficiency at the time of reheating is reduced, it is not necessarily energy saving to perform as much heat recovery as possible.
すなわち、ヒートポンプユニット2への入力(消費熱量あるいは消費電力)は、所要貯湯熱量を得るための熱回収前の必要加熱量から熱回収運転によって得られた回収熱量を減じたものを、ヒートポンプユニット2による貯湯運転中の平均効率で除したものとなり、この値は図11に示すように、回収熱量に対して最小値を有する場合がある。 That is, the input (heat consumption or power consumption) to the heat pump unit 2 is obtained by subtracting the recovered heat amount obtained by the heat recovery operation from the necessary heat amount before heat recovery for obtaining the required hot water storage heat amount. As shown in FIG. 11, this value may have a minimum value for the recovered heat amount.
したがって、浴槽3からの熱回収運転を、熱回収運転停止後に行われる再加熱運転において、ヒートポンプユニット2への入力が略最小となる時点で停止することが、より高い省エネルギー効果を得るために必要であり、熱回収によって得られる省エネルギー効果は、熱回収によって得られた回収熱量そのものではなく、回収熱量を平均効率で除したものであることが分かる。また、省エネルギーへの寄与度は、例えば、貯湯運転中の平均効率として考えることができる。 Therefore, in order to obtain a higher energy saving effect, it is necessary to stop the heat recovery operation from the bathtub 3 at the time when the input to the heat pump unit 2 becomes substantially minimum in the reheating operation performed after the heat recovery operation is stopped. Thus, it can be seen that the energy saving effect obtained by heat recovery is not the recovered heat amount itself obtained by heat recovery, but the recovered heat amount divided by the average efficiency. The degree of contribution to energy saving can be considered as, for example, the average efficiency during hot water storage operation.
最小値となる時点を見つける具体的な方法としては、所定の時間間隔で測定される貯湯槽1の温度分布に基づいて予想されるヒートポンプユニット2への入力値の刻々の変化の推移を求めて、その値の減少度合いが小さいか減少しなくなる、あるいは増加に転じることで判断する。 As a specific method for finding the time point at which the minimum value is reached, the change of the input value to the heat pump unit 2 that is predicted based on the temperature distribution of the hot water tank 1 measured at predetermined time intervals is obtained. Judgment is made when the degree of decrease in the value is small or no longer decreases, or starts to increase.
図10に示したように、貯湯槽1内の湯水をヒートポンプユニット2にて加熱する場合、貯湯槽1からヒートポンプユニット2に水を搬送させる部位の温度(本実施の形態においては、貯湯槽1の下部の温度)が低くなるにつれて、ヒートポンプユニット2の運転効率は高くなるが、浴槽3からの熱回収運転時、浴槽3から熱回収した水が貯湯槽1内に流入してくることで、貯湯槽1からヒートポンプユニット2に水を搬送させる部位の温度が上昇し始める状態が存在する。 As shown in FIG. 10, when the hot water in the hot water tank 1 is heated by the heat pump unit 2, the temperature at the site where water is transported from the hot water tank 1 to the heat pump unit 2 (in this embodiment, the hot water tank 1 The operating efficiency of the heat pump unit 2 increases as the temperature of the lower part of the heat pump unit 2 decreases. However, when the heat recovery operation from the bathtub 3 is performed, the water recovered from the bathtub 3 flows into the hot water tank 1. There is a state in which the temperature of the part that transports water from the hot water tank 1 to the heat pump unit 2 starts to rise.
したがって、浴槽3からの熱回収運転時に、貯湯槽1のヒートポンプユニット2に水を搬送させる部位の温度を測定し、その温度の上昇度合いが増加に転じる付近で、浴槽3からの熱回収運転動作を停止させることで、熱回収運転後の加熱運転時におけるヒートポンプユニット2の運転効率の略最大を実現できるのである。 Therefore, at the time of the heat recovery operation from the bathtub 3, the temperature of the part that transports water to the heat pump unit 2 of the hot water tank 1 is measured, and the heat recovery operation operation from the bathtub 3 is performed in the vicinity where the increase in the temperature starts to increase. By stopping the operation, it is possible to achieve substantially the maximum operating efficiency of the heat pump unit 2 during the heating operation after the heat recovery operation.
上記を勘案して高い省エネルギー効果を得るための熱回収運転制御手段21の制御方法
について説明する。
A control method of the heat recovery operation control means 21 for obtaining a high energy saving effect in consideration of the above will be described.
図12は熱回収運転制御手段21の動作のフローチャートである。使用者による熱回収運転起動スイッチ26の操作、あるいは風呂自動運転制御手段29による風呂自動運転終了後の所定時間経過後など、熱回収運転の開始を熱回収運転開始判断部31が判断すると、最初に水位センサ27によって浴槽の湯量に比例する水位を検知し(ステップ1)、ここで予め設定された水位として200mm以下であれば、熱回収運転を開始しないで終了する(ステップ2)。 FIG. 12 is a flowchart of the operation of the heat recovery operation control means 21. When the heat recovery operation start determination unit 31 determines the start of the heat recovery operation, such as the operation of the heat recovery operation start switch 26 by the user or the elapse of a predetermined time after the end of the automatic bath operation by the bath automatic operation control means 29, first The water level sensor 27 detects the water level proportional to the amount of hot water in the bathtub (step 1). If the water level set in advance is 200 mm or less, the heat recovery operation is terminated without starting (step 2).
ステップ1で水位が200mmを超えていれば、所要貯湯熱量取得部31で取得された所要貯湯熱量と貯湯温検知手段28a〜28eにより測定された現在の貯湯槽1の温度分布、およびヒートポンプユニット2の沸き上げ温度等の運転条件から貯湯運転完了時の貯湯槽1内の温度分布を予測し、それを現在の温度分布と比較して、その時点からヒートポンプユニット2で加熱する場合の残りの加熱量Qrを求める(ステップ3)。 If the water level exceeds 200 mm in step 1, the required hot water storage amount acquired by the required hot water storage amount acquisition unit 31, the current temperature distribution of the hot water tank 1 measured by the hot water storage temperature detection means 28a to 28e, and the heat pump unit 2 The temperature distribution in the hot water storage tank 1 at the time of completion of the hot water storage operation is predicted from the operating conditions such as the boiling temperature of the water, compared with the current temperature distribution, and the remaining heating when heating with the heat pump unit 2 from that time A quantity Qr is obtained (step 3).
次に、測定された現在の温度分布から、予測された貯湯運転完了時の温度分布に達するまでの間にヒートポンプユニット2で沸き上げる前の平均水温を推定する(ステップ4)。 Next, the average water temperature before boiling in the heat pump unit 2 is estimated from the measured current temperature distribution until the predicted temperature distribution at the time of completion of the hot water storage operation is reached (step 4).
さらにステップ4で求めた平均水温と図4で示したヒートポンプユニット2の特性とから貯湯運転時の平均効率を求め、ステップ3で求めた残りの加熱量Qrをこの平均効率で除して、貯湯運転時の入力Qinを推定する(ステップ5)。Qinは前回の評価時刻において求めた値であるQin−fとの差を求め、それが予め定めた偏差qより小さい場合、すなわち推定入力の変化が次第に小さくなって最小値と判断されたら(ステップ6)、ステップ2で貯湯槽水搬送ポンプ5aと浴槽水搬送ポンプ5bとを停止して熱回収運転を終了する。QinとQin−fとの差がq以上の場合は熱回収運転を継続し、次の評価時刻になれば(ステップ8)、以上の動作を繰り返す。 Further, the average efficiency during hot water storage operation is obtained from the average water temperature obtained in step 4 and the characteristics of the heat pump unit 2 shown in FIG. 4, and the remaining heating amount Qr obtained in step 3 is divided by this average efficiency to obtain hot water storage water. The input Qin during operation is estimated (step 5). Qin obtains a difference from Qin−f which is a value obtained at the previous evaluation time, and when it is smaller than a predetermined deviation q, that is, when a change in estimated input gradually becomes smaller and it is determined to be a minimum value (step) 6) In Step 2, the hot water tank water transfer pump 5a and the bathtub water transfer pump 5b are stopped to end the heat recovery operation. When the difference between Qin and Qin−f is equal to or greater than q, the heat recovery operation is continued, and when the next evaluation time comes (step 8), the above operation is repeated.
なお、補足として熱回収運転開始後一回目の動作時は、ステップ6での比較はおこなわずにステップ7を実行する。 As a supplement, step 7 is executed without performing the comparison in step 6 at the first operation after the start of the heat recovery operation.
ここでは熱回収運転の開始時の水位による動作を説明したが、ステップ1では熱回収運転が開始された後で水位が200mm以下となった場合にも、熱回収運転は停止されることになる(ステップ2)。 Although the operation based on the water level at the start of the heat recovery operation is described here, the heat recovery operation is also stopped in step 1 when the water level becomes 200 mm or less after the heat recovery operation is started. (Step 2).
さらに、このフローチャートには示していないが、水位センサ27が検知した水位が200mmを超えれば、この手順を再度実行することにより熱回収運転を再開し、上記の動作を行う。 Furthermore, although not shown in this flowchart, if the water level detected by the water level sensor 27 exceeds 200 mm, the heat recovery operation is restarted by performing this procedure again, and the above operation is performed.
以上が動作の説明であるが、浴槽3の湯量によらない熱回収運転の停止は、ヒートポンプユニット2の入力の最小値の判断を減少度合いが小さくなったことでおこなっている。この方法以外に、評価時刻間の入力の差qが0となる場合、またはqの符号が前回の評価時刻と逆になる場合、すなわち推定入力が増加に転じるときを最小値として、熱回収運転を停止してもよい。 Although the above is the explanation of the operation, the stop of the heat recovery operation regardless of the amount of hot water in the bathtub 3 is performed because the determination of the minimum value of the input of the heat pump unit 2 is reduced. In addition to this method, when the input difference q between the evaluation times is 0, or when the sign of q is reversed from the previous evaluation time, that is, when the estimated input starts to increase, the heat recovery operation is set to the minimum value. May be stopped.
また、測定される貯湯槽1の温度の値の測定誤差等により、推定入力は最小値に至る間に増減のあることも多い。したがって、最近の数回の評価時刻における推定入力を記憶しておき、その移動平均値を用いて最小値に達したかどうかを判断することによって、最小値に達したかどうかの判定精度をより高められる場合もある。 In addition, the estimated input often increases or decreases while reaching the minimum value due to a measurement error of the temperature value of the hot water tank 1 to be measured. Therefore, by storing the estimated input at the latest several evaluation times, and determining whether the minimum value has been reached by using the moving average value, the determination accuracy of whether the minimum value has been reached is further improved. Can be increased.
さらには、以上説明したような、その都度温度分布を評価して入力を求める方法は精度が高いものの計算が煩雑となり、熱回収運転制御手段21の負荷が大きい。 Furthermore, as described above, the method of evaluating the temperature distribution each time and obtaining the input is highly accurate, but the calculation is complicated and the load on the heat recovery operation control means 21 is large.
その場合は、入力に対して最も影響を与える位置の貯湯温の変化を予め把握しておき、その位置に対応する貯湯温検知手段28a〜28eのうち、いずれかの温度が上昇し始めたときや所定の温度上昇がみられたとき、あるいは、たとえば貯湯温検知手段28dの検知温度が上昇し、かつ貯湯温検知手段28eの検知温度は上昇しない間は、熱回収運転を継続するというように、二つ以上の温度の組み合わせに応じて停止の判断をしてもよい。 In that case, when a change in hot water storage temperature at a position that most affects the input is grasped in advance, and one of the hot water storage temperature detection means 28a to 28e corresponding to that position starts to rise. When the temperature rises or a predetermined temperature is detected, or while the temperature detected by the hot water storage temperature detection means 28d rises and the temperature detected by the hot water storage temperature detection means 28e does not increase, the heat recovery operation is continued. The stop may be determined according to a combination of two or more temperatures.
具体的には、比較的貯湯槽1の下部に近い温度が上昇してくることを検出して熱回収運転を停止させることによってもヒートポンプユニット2の効率を損なうことが少なくなって所望の効果を得ることができる。さらに、貯湯槽1のより上部の温度の変化を考慮すれば、熱回収運転による回収熱量の確保を同時に評価でき、精度は向上する。 Specifically, it is possible to reduce the efficiency of the heat pump unit 2 by reducing the heat recovery operation by detecting that the temperature relatively close to the lower portion of the hot water tank 1 is rising. Can be obtained. Furthermore, if the change of the temperature of the upper part of the hot water tank 1 is taken into consideration, it is possible to simultaneously evaluate the amount of recovered heat by the heat recovery operation, and the accuracy is improved.
以上の手順によって熱回収を停止させた後、リモコン25へ熱回収によって得られた効果を表示する。図13に、熱回収によって得られた効果を表示した表示例を示す。 After the heat recovery is stopped by the above procedure, the effect obtained by the heat recovery is displayed on the remote controller 25. FIG. 13 shows a display example displaying the effect obtained by heat recovery.
上述したように、熱回収運転時に、貯湯槽1から熱交換器4に流入する湯の温度を検出する温度検出手段55aと、熱交換器4から貯湯槽1に戻る湯の温度を検出する温度検出手段55bの温度差と、貯湯槽水搬送ポンプ5aを流れる流量とを積算することで、熱回収運転での熱交換器4における熱回収量を算出し、給湯温度(42℃)で換算した流量値を、ヒートポンプユニット2のシステム効率(COP)で除算した数値を、熱回収による省エネルギー効果値として表示している。 As described above, the temperature detecting means 55a for detecting the temperature of hot water flowing from the hot water tank 1 into the heat exchanger 4 and the temperature for detecting the temperature of hot water returning from the heat exchanger 4 to the hot water tank 1 during the heat recovery operation. By integrating the temperature difference of the detection means 55b and the flow rate flowing through the hot water tank water transfer pump 5a, the amount of heat recovered in the heat exchanger 4 in the heat recovery operation is calculated and converted to the hot water supply temperature (42 ° C.). A numerical value obtained by dividing the flow rate value by the system efficiency (COP) of the heat pump unit 2 is displayed as an energy saving effect value by heat recovery.
このように、本発明の実施の形態によれば、熱回収による省エネルギー効果を表示することにより、使用者が継続して熱回収を行うことを促すことができる。また、省エネルギー効果を過不足なく表示するため、使用者は正しく熱回収の効果を判断することができる。 As described above, according to the embodiment of the present invention, it is possible to prompt the user to continuously recover the heat by displaying the energy saving effect by the heat recovery. Moreover, since the energy saving effect is displayed without excess or deficiency, the user can correctly determine the effect of heat recovery.
また、本発明の実施の形態によれば、風呂自動運転と追い焚き運転と熱回収運転を実現するための配管系の構成において、ひとつの混合弁11の開度調整にてそれらを切り換えているので、機能の向上に対して筐体内に新たな部材の設置スペースを確保する必要がなく、重量や材料の増加、さらには待機電力の増大もなく、省資源、省エネルギーにも寄与する。 Further, according to the embodiment of the present invention, in the configuration of the piping system for realizing the automatic bath operation, the reheating operation, and the heat recovery operation, they are switched by adjusting the opening degree of one mixing valve 11. Therefore, it is not necessary to secure an installation space for a new member in the housing for improving the function, and there is no increase in weight, material, and standby power, which contributes to resource saving and energy saving.
また、併せて熱交換器4は熱交換効率の高いプレート式とするとともに、貯湯槽1の熱交戻り管16の接続位置近傍に設置することで、熱交換器4自体をコンパクトにした上で最小限の配管長として、同様に省資源となる。 In addition, the heat exchanger 4 is a plate type with high heat exchange efficiency, and is installed near the connection position of the heat exchange return pipe 16 of the hot water tank 1 to make the heat exchanger 4 itself compact. As a minimum pipe length, it will save resources as well.
そして、熱回収運転を行う際には、所要貯湯熱量を沸き上げるためのヒートポンプユニット2への入力が最小となる時点で熱回収運転を停止することによって、本来の目的であるシステム全体としての効率向上を実現し、省エネルギー性を高めることができる。 When the heat recovery operation is performed, the heat recovery operation is stopped when the input to the heat pump unit 2 for boiling up the required hot water storage amount is minimized, so that the efficiency of the entire system, which is the original purpose, is reduced. Improvement can be realized and energy saving can be improved.
構成としては、貯湯槽1下部の水を取り出して熱交換器4で加熱し、貯湯槽1の比較的上部へ戻しているが、熱回収運転による貯湯槽1内の温度分布はこの取り出し位置や戻し位置の違いによって変わる。 As a configuration, the water in the lower part of the hot water tank 1 is taken out and heated by the heat exchanger 4 and returned to the relatively upper part of the hot water tank 1. It depends on the difference in the return position.
さらに、貯湯槽水搬送ポンプ5aの能力制御によって熱回収の速度なども制御でき、これら構成や制御の違いに応じて運転効率も変化する。 Furthermore, the heat recovery speed and the like can be controlled by controlling the capacity of the hot water tank water transfer pump 5a, and the operation efficiency changes depending on the difference in configuration and control.
したがって、この実施の形態では、使われ方や貯湯槽1の容量などを考慮して適切な取り出し位置や戻り位置を設定したり、貯湯槽水搬送ポンプ5aの能力制御をおこなえるといった最適化設計の自由度が高いために複数の異なる機種に適用しやすく、その結果、多くの使用者に提供することによって大きな省エネルギー効果を得ることができる。 Therefore, in this embodiment, an optimized design is made such that an appropriate take-out position and return position can be set in consideration of usage, the capacity of the hot water tank 1, and the capacity control of the hot water tank water transfer pump 5a can be performed. Since the degree of freedom is high, it can be easily applied to a plurality of different models, and as a result, a large energy saving effect can be obtained by providing it to many users.
さらに、貯湯槽1からの給湯において、第1の出湯管22と第2の出湯管23とからの湯を高温水混合弁24で適切に混合して貯湯槽1内の中温水を有効に利用するとともに、熱交戻り管16の貯湯槽1への接続位置を第2の出湯管23よりも上にすることによって、温度成層型の貯湯槽において不可避な貯湯槽上部の高温水と下部の低温水との間にできる中温水を有効に利用できる結果、同じ蓄熱量でも貯湯槽下方に低温の水が多く確保できることから浴槽水からの回収熱量を大きくできる。 Furthermore, in hot water supply from the hot water tank 1, hot water from the first hot water discharge pipe 22 and the second hot water discharge pipe 23 is appropriately mixed by the high temperature water mixing valve 24 to effectively use the medium temperature water in the hot water storage tank 1. In addition, by making the connection position of the heat exchange return pipe 16 to the hot water storage tank 1 higher than the second hot water discharge pipe 23, the hot water in the upper part of the hot water tank and the lower temperature in the lower part are inevitable in the temperature stratified hot water tank. As a result of the effective use of the medium-temperature water that can be formed between the water and the water, the amount of heat recovered from the bath water can be increased because a large amount of low-temperature water can be secured below the hot water tank even with the same heat storage amount.
また、熱回収により発生した中温水を貯湯槽1の比較的上部に流入させることは、増加しながら貯湯槽1下方に移動する中温水を、熱回収した湯の流入位置よりも下にある第2の出湯管23を通じて給湯に利用できるので、貯湯された湯の熱量を最大限有効に使うことができる。 In addition, the flow of the intermediate warm water generated by the heat recovery into the relatively upper portion of the hot water storage tank 1 means that the intermediate warm water that moves below the hot water storage tank 1 while increasing is lower than the inflow position of the hot recovered hot water. Since it can be used for hot water supply through the two hot water outlet pipes 23, the amount of stored hot water can be used to the maximum extent possible.
同時にヒートポンプユニット2の沸き上げ効率の低下を招く貯湯槽1内の中温水が減少することでシステム全体の効率低下を防ぐことができ、熱量の有効利用による良好な使い勝手と高い省エネルギー性とを実現する。 At the same time, the medium temperature water in the hot water tank 1 that reduces the heating efficiency of the heat pump unit 2 is reduced, so that the efficiency of the entire system can be prevented from being lowered. To do.
さらに、浴槽水がないかまたは少ない場合に熱回収運転を始めると、第2の出湯管23と熱交戻り管16を適切な位置に設置することによって中温水をうまく利用して貯湯槽1下部に多くの低温の水を確保する構成にもかかわらず、貯湯槽水搬送ポンプ5aを作動させることによって貯湯槽内に中温水を増大させることになる。 Further, when the heat recovery operation is started when there is no or little bath water, the second hot water discharge pipe 23 and the heat exchange return pipe 16 are installed at appropriate positions, so that the hot water can be used well and the lower part of the hot water tank 1 In spite of the configuration of securing a large amount of low-temperature water, the hot water storage tank 5 is operated to increase the amount of hot water in the hot water storage tank.
この場合は熱回収の効果が得られない上に、ヒートポンプユニット2での沸き上げの際に効率を低下させてしまうが、予め浴槽湯量を検知して熱回収運転の実行を判断するので、第2の出湯管23と熱交戻り管16の接続位置の最適化によって得られる高い省エネルギー性を損なわない。 In this case, the effect of heat recovery cannot be obtained, and the efficiency is lowered when the heat pump unit 2 is heated. However, since the amount of hot water in the bath is detected in advance to determine the execution of the heat recovery operation, The high energy-saving property obtained by optimizing the connection position of the hot water return pipe 23 and the heat exchange return pipe 16 is not impaired.
すなわち、熱回収運転を適切に制御し、高い省エネルギー性能を実現した給湯装置を提供することができるものである。 That is, it is possible to provide a hot water supply apparatus that appropriately controls the heat recovery operation and realizes high energy saving performance.
(実施の形態2)
図14は本発明の第2の実施の形態における給湯装置の構成を示す図である。
(Embodiment 2)
FIG. 14 is a diagram showing a configuration of a hot water supply apparatus according to the second embodiment of the present invention.
図14において、第1の実施の形態と異なる点は、切換手段51を設け、熱交換器4の一次側入口に、切換手段51を介して、第1の出湯管22から分岐された追い焚き運転の流路となる熱交往き管52を接続するとともに、貯湯槽1の下部と切換手段51とを、ヒートポンプユニット2を介して、熱回収往き管53にて接続している。 In FIG. 14, the difference from the first embodiment is that a switching means 51 is provided, and a reheating branch branched from the first outlet pipe 22 through the switching means 51 to the primary inlet of the heat exchanger 4. A heat transfer pipe 52 serving as a flow path for operation is connected, and a lower part of the hot water tank 1 and the switching means 51 are connected via a heat pump unit 2 by a heat recovery forward pipe 53.
さらには、貯湯槽1の上部と切換手段51とを沸き上げ戻り管54にて接続し、貯湯槽水搬送ポンプ5aを熱回収往き管53に配設している。 Furthermore, the upper part of the hot water tank 1 and the switching means 51 are connected by a boiling return pipe 54, and the hot water tank water transfer pump 5 a is disposed in the heat recovery forward pipe 53.
以上のように構成された給湯装置について、以下その動作、作用を説明する。動作全体については第1の実施の形態で説明したものと同様であり、回路の違いによる湯水の経路が異なる部分について説明する。 About the hot water supply apparatus comprised as mentioned above, the operation | movement and an effect | action are demonstrated below. The entire operation is the same as that described in the first embodiment, and a portion in which the hot water path differs depending on the circuit will be described.
熱交換器4により浴槽3の湯の有する熱を貯湯槽1の湯水に回収する熱回収運転を行う
ときには、図15に示すように、浴槽3の湯を熱交換器4の二次側流路に搬送するために浴槽水搬送ポンプ5bを運転する。
When performing a heat recovery operation in which the heat of the hot water of the bathtub 3 is recovered by the heat exchanger 4 into the hot water of the hot water tank 1, the hot water of the bathtub 3 is used as the secondary flow path of the heat exchanger 4 as shown in FIG. The bathtub water conveyance pump 5b is operated in order to convey the water.
その後、貯湯槽1の下部から、熱回収往き管53、ヒートポンプユニット2、切換手段51、熱交換器4の一次側流路、熱交戻り管16、貯湯槽1の略中央部へと順に貯湯槽1からの湯水を流すよう、貯湯槽水搬送ポンプ5aを運転する。これにより、浴槽3の湯が有する熱が貯湯槽1の湯水に回収される。 Thereafter, from the lower part of the hot water storage tank 1, the hot water storage pipe 53, the heat pump unit 2, the switching means 51, the primary flow path of the heat exchanger 4, the heat exchange return pipe 16, and the substantially central part of the hot water storage tank 1 are sequentially stored. The hot water storage tank water conveyance pump 5a is operated so that the hot water from the tank 1 flows. Thereby, the heat which the hot water of the bathtub 3 has is collect | recovered by the hot water of the hot water tank 1.
なお、浴槽水搬送ポンプ5bによる湯の搬送量を貯湯槽水搬送ポンプ5aによる湯水の搬送量より大きくすることで、浴槽水搬送ポンプ5bによる必要流量が確保されて、浴槽3内の温度分布が均一化され、浴槽3から安定的に熱回収を行うことができるとともに、貯湯槽水搬送ポンプ5aによる搬送流量が過大になって、貯湯槽1内の湯水が攪拌されることなく、温度成層を保持できるため、後述する貯湯槽1内の湯水の沸き上げ運転を効率的に行うことが可能となる。 In addition, the required flow volume by the bathtub water conveyance pump 5b is ensured by making the conveyance amount of the hot water by the bathtub water conveyance pump 5b larger than the conveyance amount of the hot water by the hot water tank water conveyance pump 5a, and the temperature distribution in the bathtub 3 is It is made uniform and heat can be stably recovered from the bathtub 3, and the flow rate by the hot water tank water transfer pump 5a becomes excessive, so that the hot water in the hot water tank 1 is not stirred and the temperature stratification is performed. Since it can hold | maintain, it becomes possible to perform the boiling operation of the hot water in the hot water storage tank 1 mentioned later efficiently.
なお、本実施の形態においても、実施の形態1にて説明したように、熱回収運転時に、貯湯槽1から熱交換器4に流入する湯の温度を検出する温度検出手段55aと、熱交換器4から貯湯槽1に戻る湯の温度を検出する温度検出手段55bの温度差と、貯湯槽水搬送ポンプ5aを流れる流量とを積算することで、熱回収運転での熱交換器4における熱回収量を算出し、給湯温度(42℃)で換算した流量値を、ヒートポンプユニット2のシステム効率(COP)で除算した数値を、熱回収による省エネルギー効果値として、図13のように表示している。 In the present embodiment, as described in the first embodiment, the temperature detection means 55a for detecting the temperature of hot water flowing from the hot water tank 1 into the heat exchanger 4 and the heat exchange during the heat recovery operation. The heat in the heat exchanger 4 in the heat recovery operation is integrated by integrating the temperature difference of the temperature detecting means 55b for detecting the temperature of hot water returning from the vessel 4 to the hot water tank 1 and the flow rate flowing through the hot water tank water transfer pump 5a. The recovered amount is calculated and the flow rate value converted by the hot water supply temperature (42 ° C) divided by the system efficiency (COP) of the heat pump unit 2 is displayed as an energy saving effect value by heat recovery as shown in FIG. Yes.
また、ヒートポンプユニット2により、貯湯槽1内の湯水を加熱する沸き上げ運転を行うときには、図16に示すように、運転制御手段18によって切換手段51の流路方向を上述した熱回収運転時とは異なる方向に切り換えて、貯湯槽水搬送ポンプ5aを運転することで、貯湯槽1の下部から、熱回収往き管53、ヒートポンプユニット2、切換手段51、沸き上げ戻り管54、貯湯槽1の上部へと順に貯湯槽1からの湯水を流し、ヒートポンプユニット2通過後の湯が、所定の沸き上げ温度になるように、貯湯槽水搬送ポンプ5aによる湯水の搬送量を制御する。 Further, when the boiling operation for heating the hot water in the hot water tank 1 is performed by the heat pump unit 2, as shown in FIG. 16, the flow direction of the switching means 51 is changed by the operation control means 18 during the heat recovery operation described above. Are switched to different directions and the hot water tank water transfer pump 5a is operated, so that the heat recovery forward pipe 53, the heat pump unit 2, the switching means 51, the boiling return pipe 54, and the hot water tank 1 are Hot water from the hot water storage tank 1 is flowed to the upper part in order, and the hot water transfer amount by the hot water tank water transfer pump 5a is controlled so that the hot water after passing through the heat pump unit 2 reaches a predetermined boiling temperature.
これにより、貯湯槽1下部の水がヒートポンプユニット2で加熱されて、貯湯槽1の上部に戻され、高温湯が貯湯槽1内で貯湯される。 Thereby, the water in the lower part of the hot water tank 1 is heated by the heat pump unit 2 and returned to the upper part of the hot water tank 1, and the hot water is stored in the hot water tank 1.
なお、熱回収運転と沸き上げ運転のいずれの場合も、熱交換器4の一次側に貯湯槽1の下部の湯水を搬送するために、熱回収往き管53に設けた貯湯槽水搬送ポンプ5aを用いたが、熱回収運転を行う場合には、第1の実施の形態のように、熱交戻り管16に設けたポンプを用いてもよい。 Note that, in both the heat recovery operation and the boiling operation, the hot water storage tank water transport pump 5a provided in the heat recovery forward pipe 53 in order to transport the hot water in the lower part of the hot water storage tank 1 to the primary side of the heat exchanger 4. However, when performing the heat recovery operation, a pump provided in the heat exchange return pipe 16 may be used as in the first embodiment.
この実施の形態では、切換手段51を用いることで熱回収運転と沸き上げ運転の流路のかなりの部分を共用できるため、使用する配管部材を少なくできることから、省資源化、低コスト化が実現できるという効果がある。 In this embodiment, since a considerable part of the flow path of the heat recovery operation and the boiling operation can be shared by using the switching means 51, the number of piping members to be used can be reduced, thus realizing resource saving and cost reduction. There is an effect that can be done.
以上のように、本発明にかかる給湯装置は、浴槽の湯からの熱回収運転に際し、湯量を考慮して適切な制御を行うので、前記したような家庭用の給湯装置に適用できるほか、業務用などの規模の大きい用途にも適用し、実用性に優れた給湯装置を提供できる。 As described above, the hot water supply apparatus according to the present invention performs appropriate control in consideration of the amount of hot water during the heat recovery operation from the hot water in the bathtub, so that it can be applied to a domestic hot water supply apparatus as described above. It can also be applied to large-scale applications such as for use, and can provide a hot water supply device with excellent practicality.
1 貯湯槽
2 加熱手段(ヒートポンプユニット)
3 浴槽
4 熱交換器
5a 第1の搬送ポンプ(貯湯槽水搬送ポンプ)
5b 第2の搬送ポンプ(浴槽水搬送ポンプ)
8 高温水供給管
9 低温水供給管
10 給湯管
11 混合弁
12 浴槽水循環配管
13 開閉弁
14 給水管
15 給湯分岐管
16 熱交戻り管
17 浴槽水温検知手段
18 運転制御手段
21 熱回収運転制御手段
22 第1の出湯管
23 第2の出湯管
24 高温水混合弁
25 リモコン(表示手段)
26 熱回収運転起動スイッチ
27 浴槽湯量検知手段(水位センサ)
28 貯湯温検知手段
29 風呂自動運転制御手段
30 追い焚き運転制御手段
51 切換手段
52 熱交往き管
53 熱回収往き管
54 沸き上げ戻り管
1 Hot water tank 2 Heating means (heat pump unit)
3 Bathtub 4 Heat exchanger 5a First transfer pump (hot water storage tank transfer pump)
5b Second transfer pump (tub water transfer pump)
DESCRIPTION OF SYMBOLS 8 High temperature water supply pipe 9 Low temperature water supply pipe 10 Hot water supply pipe 11 Mixing valve 12 Bath water circulation pipe 13 On-off valve 14 Water supply pipe 15 Hot water branch pipe 16 Heat exchange return pipe 17 Bath water temperature detection means 18 Operation control means 21 Heat recovery operation control means 22 1st tapping pipe 23 2nd tapping pipe 24 High temperature water mixing valve 25 Remote control (display means)
26 Heat recovery operation start switch 27 Bath water amount detection means (water level sensor)
28 Hot water storage temperature detection means 29 Bath automatic operation control means 30 Reheating operation control means 51 Switching means 52 Heat exchange pipe 53 Heat recovery forward pipe 54 Boiling return pipe
Claims (3)
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JP2012091579A JP6111409B2 (en) | 2012-04-13 | 2012-04-13 | Water heater |
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JP2012091579A JP6111409B2 (en) | 2012-04-13 | 2012-04-13 | Water heater |
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JP2013221632A JP2013221632A (en) | 2013-10-28 |
JP6111409B2 true JP6111409B2 (en) | 2017-04-12 |
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JP2012091579A Active JP6111409B2 (en) | 2012-04-13 | 2012-04-13 | Water heater |
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Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
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JP6729458B2 (en) * | 2017-03-16 | 2020-07-22 | 三菱電機株式会社 | Water heater |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6071828A (en) * | 1983-09-28 | 1985-04-23 | Hiroshi Koyama | Hot water supply system |
JP3663976B2 (en) * | 1999-05-28 | 2005-06-22 | 松下電器産業株式会社 | Heat pump bath water heater |
JP2001272106A (en) * | 2000-03-27 | 2001-10-05 | Toto Ltd | Bath hot water heat recovery cold storage system |
JP2002195651A (en) * | 2000-12-28 | 2002-07-10 | Chofu Seisakusho Co Ltd | Hot-water supply system utilizing waste heat |
JP2003083613A (en) * | 2001-09-07 | 2003-03-19 | Toto Ltd | Bathtub water waste heat recovery system |
JP5141293B2 (en) * | 2008-02-22 | 2013-02-13 | 三菱電機株式会社 | Hot water storage hot water system, control method for hot water storage hot water system |
JP5215692B2 (en) * | 2008-03-07 | 2013-06-19 | 東芝キヤリア株式会社 | Heat pump water heater |
JP5312215B2 (en) * | 2009-06-12 | 2013-10-09 | 株式会社長府製作所 | Heat recovery system |
JP5829492B2 (en) * | 2011-11-10 | 2015-12-09 | 大阪瓦斯株式会社 | Hot water storage type hot water supply system and operation control method thereof |
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