JP2013245848A - Storage water heater - Google Patents
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- JP2013245848A JP2013245848A JP2012118217A JP2012118217A JP2013245848A JP 2013245848 A JP2013245848 A JP 2013245848A JP 2012118217 A JP2012118217 A JP 2012118217A JP 2012118217 A JP2012118217 A JP 2012118217A JP 2013245848 A JP2013245848 A JP 2013245848A
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Abstract
Description
本発明は、貯湯給湯装置に関し、特に試運転時に循環加熱回路に自動的に且つ確実に水張りできるようにした貯湯給湯装置に関する。 The present invention relates to a hot water storage hot water supply apparatus, and more particularly to a hot water storage hot water supply apparatus that can automatically and reliably fill a circulating heating circuit during a trial operation.
貯湯給湯装置は、一般的に、貯湯槽と、この貯湯槽の下部に接続された給水管及び上部に接続された出湯管と、この出湯管から分岐して浴槽へ湯水を供給する為の注湯配管と、この注湯配管に設けられた注湯電磁弁と、前記給水管に設けられた給水開閉弁と、前記貯湯槽の下部から熱源機を経由して貯湯槽の上部へ水を循環させて加熱する循環加熱回路と、この循環加熱回路に設けられた循環ポンプ等を有する。前記熱源機としては、燃料電池発電ユニットの排熱回収熱交換器やヒートポンプユニット等が活用される。 A hot water storage and hot water supply apparatus generally has a hot water storage tank, a water supply pipe connected to the lower part of the hot water storage tank, a hot water supply pipe connected to the upper part, and a branch for supplying hot water to the bathtub by branching from the hot water discharge pipe. Water is circulated from the lower part of the hot water tank to the upper part of the hot water tank via a heat source device, the hot water solenoid valve provided in the hot water pipe, the hot water solenoid valve provided in the hot water pipe, A circulation heating circuit that heats the circulation heating circuit and a circulation pump provided in the circulation heating circuit. As the heat source unit, an exhaust heat recovery heat exchanger or a heat pump unit of a fuel cell power generation unit is used.
上記の貯湯給湯装置の設置後に試運転する際には、貯湯槽、循環加熱回路、出湯管や注湯配管等の配管系に水張りを行ってエア抜きしてから熱源機を作動させる。この水張り時には、注湯電磁弁と給水開閉弁を開放状態に切換えた状態で、給水管から給水しながら貯湯槽に水張りし、その後循環ポンプを駆動して循環加熱回路に水張りすると共に出湯管や注湯配管等の配管系に水張する。 When a trial operation is performed after the hot water storage hot water supply apparatus is installed, the heat source device is operated after filling the piping system such as the hot water storage tank, the circulation heating circuit, the hot water discharge pipe and the pouring pipe with air. At the time of water filling, the hot water solenoid valve and the water supply opening / closing valve are switched to the open state, water is supplied to the hot water tank while supplying water from the water supply pipe, and then the circulation pump is driven to fill the circulation heating circuit with water, Fill the piping system such as the hot water piping.
一般的な貯湯給湯装置の貯湯槽と循環加熱回路の水張り運転としては、例えば、特許文献１のヒートポンプ式給湯機には、貯湯槽に水張りしてから、循環ポンプを駆動して貯湯槽内の水を利用して循環加熱回路に自動的に水張りする運転が開示されている。 As a water filling operation of a hot water storage tank and a circulation heating circuit of a general hot water storage hot water supply apparatus, for example, in the heat pump type hot water heater of Patent Document 1, the hot water tank is filled with water, and then the circulation pump is driven to An operation in which water is automatically filled in a circulation heating circuit using water is disclosed.
ところで、貯湯給湯装置において、機器の配置上の都合から循環ポンプが貯湯槽の底部よりも高い位置に配置されることも関係して、循環加熱回路に水張りする際に、循環加熱回路内のエア抜きが不十分のため、循環ポンプが空運転状態になって循環加熱回路に水が流れず、熱源機が空焚き状態になる虞がある。 By the way, in the hot water storage and hot water supply apparatus, when the water is filled in the circulation heating circuit, the air in the circulation heating circuit is related to the fact that the circulation pump is arranged at a position higher than the bottom of the hot water storage tank for the convenience of equipment arrangement. Since the extraction is insufficient, the circulation pump may be in an idle operation state, water may not flow into the circulation heating circuit, and the heat source machine may be in an empty state.
特許文献１のヒートポンプ式給湯機では、貯湯槽に水張り後、循環加熱回路に水張りする際、図５，図６に基づいて以下に説明するように、循環加熱回路内にエアが残留する虞があるため、正常な試運転を行うことができるとは限らない。 In the heat pump type water heater of Patent Document 1, when water is filled in the hot water storage tank and then water is filled in the circulation heating circuit, air may remain in the circulation heating circuit as described below with reference to FIGS. 5 and 6. Therefore, it is not always possible to perform a normal test run.
図５，図６は貯湯給湯装置１００の貯湯槽１０３と循環加熱回路１０１に水張りする際の挙動を示すもので、図５に示すように、給水管１０２から貯湯槽１０３内へ給水していくと、循環加熱回路１０１の往き側通路１０１ａ内へも給水されて水位が上昇していき、循環ポンプ１０５の位置まで水張り状態になる。しかし、循環加熱回路１０１の管路抵抗の影響もあるため循環加熱回路１０１の途中までしか水張りされない。 5 and 6 show the behavior when the hot water storage tank 103 and the circulating heating circuit 101 of the hot water storage hot water supply apparatus 100 are filled with water, and water is supplied from the water supply pipe 102 into the hot water storage tank 103 as shown in FIG. Then, water is also supplied into the forward passage 101a of the circulation heating circuit 101, the water level rises, and the water is filled up to the position of the circulation pump 105. However, since there is an influence of the pipe resistance of the circulating heating circuit 101, water is filled only halfway through the circulating heating circuit 101.
その後、図６に示すように、貯湯槽１０３が満水状態になって貯湯槽１０３の内部の全域に給水圧が作用したとき、貯湯槽１０３の上部に接続された戻り側通路１０１ｂにも給水圧が作用し、戻り側通路１０１ｂに水が流入して循環加熱回路１０１内にエアが閉じ込められた状態になって、そのエアが往き側通路１０１ａ側へ押し戻され、循環ポンプ１０５に水張りされない状態が発生することがある。この場合、循環ポンプ１０５を駆動しても空運転となり、循環加熱回路１０１に水が流れずに、熱源機１０４が空焚き状態になる。 After that, as shown in FIG. 6, when the hot water storage tank 103 is full and the water supply pressure is applied to the entire area inside the hot water storage tank 103, the water supply pressure is also applied to the return side passage 101 b connected to the upper part of the hot water storage tank 103. Acts, the water flows into the return side passage 101b and the air is trapped in the circulation heating circuit 101, the air is pushed back to the outgoing side passage 101a side, and the circulation pump 105 is not filled with water. May occur. In this case, even if the circulation pump 105 is driven, the operation is idle, and water does not flow into the circulation heating circuit 101, and the heat source device 104 is in an empty state.
そのため、従来では、貯湯給湯装置１００への水張りを完全自動化することは難しく、作業員が計器類を点検しながら手動操作により水張りを行っていたため、貯湯給湯装置１００への水張りに多くの時間と労力を要していた。特に、循環ポンプ１０５を貯湯槽１０３側ではなく、熱源機１０４側に設ける場合には、貯湯槽１０３から循環ポンプ１０５に延びる往き側通路１０１ａの通路長も長くなるため上記の問題が顕著になる。 Therefore, in the past, it was difficult to fully automate the filling of the hot water storage hot water supply device 100, and the worker performed the water filling by manual operation while checking the instruments. It took effort. In particular, when the circulation pump 105 is provided not on the hot water storage tank 103 side but on the heat source device 104 side, the length of the forward side passage 101a extending from the hot water storage tank 103 to the circulation pump 105 becomes longer, so the above problem becomes significant. .
本発明の目的は、試運転時に循環加熱回路に自動的に且つ確実に水張りすることのできる貯湯給湯装置を提供することである。 An object of the present invention is to provide a hot water storage and hot water supply apparatus that can automatically and reliably fill a circulating heating circuit during a trial operation.
請求項１の貯湯給湯装置は、貯湯槽と、この貯湯槽の下部から熱源機を経由して貯湯槽の上部へ水を循環させて加熱する循環加熱回路と、この循環加熱回路に設けられた循環ポンプと、前記貯湯槽の下部に接続された給水管及び上部に接続された出湯管と、この出湯管から分岐して浴槽へ湯水を供給する為の注湯配管と、この注湯配管に設けられた注湯電磁弁と、前記給水管に設けられた給水開閉弁とを備えた貯湯給湯装置であって、この貯湯給湯装置に水張りを行う際には、前記注湯電磁弁と前記給水開閉弁を開放してエア抜きを行いながら前記貯湯槽への水張りを行い、前記貯湯槽の水張りが完了したことを検知してから、前記循環ポンプを駆動して前記循環加熱回路の水張りを行う貯湯給湯装置において、前記貯湯槽の水張り完了後、前記給水開閉弁を閉弁させてから開弁状態に戻すと共に、前記開弁状態になる前に前記循環ポンプを駆動する制御手段を設けたことを特徴としている。 The hot water storage hot water supply apparatus according to claim 1 is provided in the hot water storage tank, a circulation heating circuit that circulates and heats water from the lower part of the hot water storage tank to the upper part of the hot water storage tank via the heat source unit, and the circulation heating circuit. A circulation pump, a water supply pipe connected to the lower part of the hot water storage tank and a hot water supply pipe connected to the upper part, a hot water supply pipe branched from the hot water supply pipe to supply hot water to the bathtub, and the hot water supply pipe A hot water storage and hot water supply device provided with a hot water supply solenoid valve provided and a water supply opening and closing valve provided in the water supply pipe, and when the hot water supply and hot water supply device is filled with water, the hot water supply electromagnetic valve and the water supply The hot water tank is filled with water while releasing the air by opening the on-off valve, and after detecting that the hot water tank has been filled, the circulating pump is driven to fill the circulating heating circuit. In the hot water storage hot water supply device, after completion of water filling of the hot water storage tank, Serial with back from by closing the water supply on-off valve in the open state, is characterized in that a control means for driving the circulation pump Before the open state.
請求項２の貯湯給湯装置は、請求項１の発明において、前記制御手段は、前記給水開閉弁の閉弁から所定時間経過して前記貯湯槽内に給水圧が作用しなくなった状態で前記給水開閉弁を開弁状態に戻すことを特徴としている。 According to a second aspect of the present invention, there is provided the hot water storage and hot water supply apparatus according to the first aspect of the invention, wherein the control means is configured such that the water supply pressure does not act on the hot water storage tank after a predetermined time has elapsed since the water supply on / off valve is closed. The on / off valve is returned to the open state.
請求項３の貯湯給湯装置は、請求項１又は２の発明において、前記制御手段は、前記循環ポンプの駆動状態で前記給水開閉弁の閉開駆動を複数回繰り返し行うことを特徴としている。 According to a third aspect of the present invention, there is provided the hot water storage and hot water supply apparatus according to the first or second aspect, wherein the control means repeatedly performs the opening / closing drive of the water supply on / off valve a plurality of times while the circulation pump is driven.
請求項１の発明によれば、貯湯給湯装置に水張りを行う際には、注湯電磁弁と給水開閉弁を開放してエア抜きを行いながら貯湯槽への水張りを行い、貯湯槽の水張りが完了したことを検知してから、循環ポンプを駆動して循環加熱回路の水張りを行う貯湯給湯装置において、貯湯槽の水張り完了後、給水開閉弁を閉弁させてから開弁状態に戻すと共に、開弁状態になる前に循環ポンプを駆動する制御手段を設けたので、給水開閉弁を閉弁させたとき、貯湯槽内に給水圧が作用しない状態になり、その後給水開閉弁を開弁状態に戻したとき、貯湯槽内の下部の水圧が上昇し、貯湯槽の下部と上部の水圧の差圧が瞬間的に大きくなって、貯湯槽の下部側の水圧でもって循環加熱回路の往き側通路内のエアが戻り側通路の方へ押し戻され、循環ポンプが水張り状態になる。 According to the first aspect of the present invention, when filling the hot water storage hot water supply device, the hot water storage tank is filled with water while the hot water solenoid valve and the water supply opening / closing valve are opened to release the air. In the hot water storage and hot water supply apparatus that drives the circulation pump and fills the circulation heating circuit after detecting completion, after the filling of the hot water tank is completed, the water supply on / off valve is closed and then returned to the open state, Since the control means to drive the circulation pump before opening the valve is provided, when the water supply on / off valve is closed, the water supply pressure does not act on the hot water tank, and then the water supply on / off valve is opened. When the water pressure is restored, the water pressure in the lower part of the hot water tank rises, and the differential pressure between the lower and upper parts of the hot water tank increases momentarily, and the water pressure in the lower part of the hot water tank causes the return side of the circulating heating circuit Air in the passage is pushed back toward the return passage and the circulation pump But it becomes water filling state.
従って、循環ポンプが水張り状態になる前に循環ポンプを駆動させておくと、循環加熱回路内のエアを貯湯槽へ抜いて循環加熱回路に確実に水張りすることができる。また、制御手段により、給水開閉弁の閉開制御と循環ポンプの駆動を自動的に行うことができるため、循環加熱回路への水張りを自動的に行うことができる。 Therefore, if the circulating pump is driven before the circulating pump is filled with water, the air in the circulating heating circuit can be drawn into the hot water storage tank and reliably filled in the circulating heating circuit. In addition, since the control means can automatically perform the opening / closing control of the water supply opening / closing valve and the driving of the circulation pump, the water filling to the circulation heating circuit can be automatically performed.
請求項２の発明によれば、制御手段は、給水開閉弁の閉弁から所定時間経過して貯湯槽内に給水圧が作用しなくなった状態で給水開閉弁を開弁状態に戻すので、貯湯槽の下部と上部の水圧の差圧を確実に発生させて、循環ポンプを水張り状態にすることができる。 According to the invention of claim 2, the control means returns the water supply opening / closing valve to the open state in a state where a predetermined time has elapsed from the closing of the water supply opening / closing valve and no hot water pressure is applied to the hot water storage tank. A differential pressure between the water pressure at the lower part and the upper part of the tank can be reliably generated, and the circulation pump can be filled with water.
請求項３の発明によれば、制御手段は、循環ポンプの駆動状態で給水開閉弁の閉開駆動を複数回繰り返し行うので、循環ポンプを確実に水張り状態にして、循環加熱回路に完全に水張りすることができる。 According to the third aspect of the present invention, the control means repeatedly opens and closes the water supply on / off valve a plurality of times while the circulation pump is driven, so that the circulation pump is reliably filled with water and the circulation heating circuit is completely filled with water. can do.
以下、本発明を実施するための形態について実施例に基づいて説明する。 Hereinafter, modes for carrying out the present invention will be described based on examples.
先ず、燃料電池コージェネレーションシステム１の全体構成について説明する。
図１，図２に示すように、この燃料電池コージェネレーションシステム１は、燃料電池発電ユニット２と、この燃料電池発電ユニット２を熱源機とする貯湯給湯装置３とで構成されている。
First, the overall configuration of the fuel cell cogeneration system 1 will be described.
As shown in FIGS. 1 and 2, the fuel cell cogeneration system 1 includes a fuel cell power generation unit 2 and a hot water storage and hot water supply device 3 using the fuel cell power generation unit 2 as a heat source device.
図２に示すように、燃料電池発電ユニット２は、貯湯槽４１の湯水を加熱する為の貯湯給湯装置３の外部熱源であり、燃料電池発電モジュール４、カソード空気用送風装置５、燃料ガス昇圧用送風装置６、燃料改質空気用送風装置７、排気ガス排出通路８、熱交換器９、水処理装置１１、インバータ１２等から構成されている。 As shown in FIG. 2, the fuel cell power generation unit 2 is an external heat source of the hot water storage hot water supply device 3 for heating the hot water in the hot water storage tank 41, and includes a fuel cell power generation module 4, a cathode air blower 5, and a fuel gas booster. For example, a fuel reforming air blower 7, an exhaust gas discharge passage 8, a heat exchanger 9, a water treatment device 11, an inverter 12 and the like.
燃料電池発電ユニット２は、上記の各種装置が外装ケース１３に一体的に収納されて構成され、燃料電池発電モジュール４にて発電された直流電力は、インバータ１２を介して交流電力に変換されて外部に出力される。 The fuel cell power generation unit 2 is configured by integrally housing the various devices described above in an outer case 13, and the DC power generated by the fuel cell power generation module 4 is converted into AC power via the inverter 12. Output to the outside.
燃料電池発電モジュール４は、燃料電池セルスタック２１、蒸発器２２、燃料改質器２３、オフガス燃焼室２４、熱交換器２７等を備え、燃料改質器２３によって改質された改質燃料ガス及び酸化剤としての空気を燃料電池セルスタック２１で化学反応させることで発電を行うものである。 The fuel cell power generation module 4 includes a fuel cell stack 21, an evaporator 22, a fuel reformer 23, an off-gas combustion chamber 24, a heat exchanger 27, and the like, and the reformed fuel gas reformed by the fuel reformer 23 In addition, the fuel cell stack 21 chemically reacts with air as an oxidant to generate power.
カソード空気用送風装置５は、外部から空気を発電空気ブロワ５ａに取り込み、この取り込まれた空気を空気通路１５を介して燃料電池発電モジュール４に供給する。 The cathode air blower 5 takes air from the outside into the power generation air blower 5 a and supplies the taken air to the fuel cell power generation module 4 through the air passage 15.
燃料ガス昇圧用送風装置６は、図示外のガス供給源から燃料ガスを燃料昇圧ブロワ６ａに取り込み、この昇圧された燃料ガスを、ガス通路１６と共通通路１８を介して燃料電池発電モジュール４に供給する。 The fuel gas boosting blower 6 takes fuel gas from a gas supply source (not shown) into the fuel booster blower 6a, and supplies the boosted fuel gas to the fuel cell power generation module 4 via the gas passage 16 and the common passage 18. Supply.
燃料改質空気用送風装置７は、外部から燃料改質用の空気を改質空気ブロワ７ａに取り込み、この取り込まれた燃料改質用の空気を、改質空気通路１７と共通通路１８を介して燃料電池発電モジュール４に供給する。 The fuel reforming air blower 7 takes in fuel reforming air from the outside into the reforming air blower 7 a, and the taken fuel reforming air is passed through the reforming air passage 17 and the common passage 18. To the fuel cell power generation module 4.
熱交換器９は、排気ガス排出通路８の途中部に設けられ、循環加熱回路４５の一部を構成する熱交換通路部９ａを備えている。この熱交換器９において、燃料電池発電モジュール４から排出される排気ガスを、熱交換通路部９ａを流れる湯水との間で熱交換させて、排気ガス中に含まれる水蒸気は冷却され凝縮されて凝縮水となる。 The heat exchanger 9 is provided in the middle of the exhaust gas discharge passage 8 and includes a heat exchange passage portion 9 a that constitutes a part of the circulation heating circuit 45. In this heat exchanger 9, the exhaust gas discharged from the fuel cell power generation module 4 is subjected to heat exchange with hot water flowing through the heat exchange passage portion 9a, and the water vapor contained in the exhaust gas is cooled and condensed. It becomes condensed water.
水処理装置１１は、処理タンク３１、純水タンク３２、純水ポンプ３３等を備え、熱交換器９にて凝縮された凝縮水を、回収通路３４を介して回収し、処理タンク３１により不純物を取り除いた水を、純水通路３５を介して燃料電池発電モジュール４の蒸発器２２に供給するものであり、所謂、水自立運転が行われている。 The water treatment device 11 includes a treatment tank 31, a pure water tank 32, a pure water pump 33, etc., collects condensed water condensed in the heat exchanger 9 through a collection passage 34, and impurities are collected in the treatment tank 31. The water from which water is removed is supplied to the evaporator 22 of the fuel cell power generation module 4 through the pure water passage 35, and so-called water self-sustained operation is performed.
次に、貯湯給湯装置３について説明する。
図１に示すように、貯湯給湯装置３は、貯湯、給湯、風呂への注湯、床暖房パネル等の温水暖房端末への温水の供給、風呂の追い焚き等の機能を有するものであり貯湯槽４１、補助熱源機４２、第１，第２熱交換器４３，４４、燃料電池発電ユニット２側において循環ポンプ６４が介装された循環加熱回路４５、給水通路４６、出湯通路４７、温水暖房回路４８、風呂給湯追焚回路４９、熱利用循環回路５０、複数のバイパス通路５１〜５４，５７、風呂注湯通路５５等を備え、これらは外装ケース５９内に一体的に収納されて構成されている。
Next, the hot water storage hot water supply apparatus 3 will be described.
As shown in FIG. 1, the hot water storage hot water supply device 3 has functions such as hot water storage, hot water supply, pouring to a bath, supply of hot water to a hot water heating terminal such as a floor heating panel, and reheating of the bath. The tank 41, the auxiliary heat source device 42, the first and second heat exchangers 43 and 44, the circulation heating circuit 45 in which the circulation pump 64 is interposed on the fuel cell power generation unit 2 side, the water supply passage 46, the hot water passage 47, the hot water heating A circuit 48, a bath hot water supply circuit 49, a heat utilization circulation circuit 50, a plurality of bypass passages 51 to 54, 57, a bath pouring passage 55, and the like are integrally housed in an outer case 59. ing.
貯湯槽４１は、高温の湯水（例えば、８０〜９０℃）を貯留可能な上下方向に細長い密閉タンクであり、貯留された温水の放熱を防ぐ為にタンク周囲は断熱材で覆われている。貯湯槽４１内の複数の貯留層の湯水の温度が複数の貯湯水温度センサ６１ａ〜６１ｄにより検出される。 The hot water storage tank 41 is a vertically long and narrow closed tank that can store hot hot water (for example, 80 to 90 ° C.), and the tank periphery is covered with a heat insulating material to prevent heat dissipation of the stored hot water. The temperature of the hot water in the plurality of reservoirs in the hot water tank 41 is detected by the plurality of hot water temperature sensors 61a to 61d.
補助熱源機４２は、公知のガス給湯器で構成され、熱利用循環回路５０の湯水の温度が不足する等の特別な場合に限り、湯水を再度加熱するものである。 The auxiliary heat source unit 42 is composed of a known gas water heater, and heats the hot water again only in special cases such as when the temperature of the hot water in the heat utilization circuit 50 is insufficient.
第１熱交換器４３は、温水暖房回路４８を流れる暖房水を加熱するものであり、この第１熱交換器４３において、熱利用循環回路５０を流れる高温の湯水と温水暖房回路４８を流れる暖房水との間で熱交換され、暖房水が加熱される。 The first heat exchanger 43 heats the heating water flowing through the hot water heating circuit 48. In this first heat exchanger 43, the hot water flowing through the heat utilization circulation circuit 50 and the heating flowing through the hot water heating circuit 48 are used. Heat is exchanged with water, and the heating water is heated.
第２熱交換器４４は、風呂給湯追焚回路４９を流れる浴槽水を加熱するものであり、この第２熱交換器４４において、熱利用循環回路５０を流れる高温の湯水と風呂給湯追焚回路４９を流れる風呂のお湯との間で熱交換され、浴槽水が加熱される。 The second heat exchanger 44 heats the bath water flowing through the bath hot water supply circuit 49, and in the second heat exchanger 44, the hot hot water flowing through the heat utilization circulation circuit 50 and the bath hot water supply circuit Heat is exchanged with hot water in the bath flowing through 49, and the bath water is heated.
次に、循環加熱回路４５について説明する。
図１，図２に示すように、循環加熱回路４５は、外部熱源である燃料電池発電ユニット２の熱交換器９と貯湯槽４１との間に湯水を循環させる閉回路であり、往き側通路４５ａ、戻り側通路４５ｂを有し、貯湯槽４１の下部に往き側通路４５ａの上流端が接続され、貯湯タンク４１の上部に戻り側通路４５ｂの下流端が接続されている。
Next, the circulation heating circuit 45 will be described.
As shown in FIGS. 1 and 2, the circulation heating circuit 45 is a closed circuit that circulates hot water between the heat exchanger 9 and the hot water storage tank 41 of the fuel cell power generation unit 2, which is an external heat source. 45a and a return side passage 45b. The upstream end of the forward passage 45a is connected to the lower part of the hot water storage tank 41, and the downstream end of the return side passage 45b is connected to the upper part of the hot water storage tank 41.
往き側通路４５ａの途中部から戻り側通路４５ｂの途中部にバイパスする第１バイパス通路５１が分岐され、この分岐部には、貯湯切換弁６２が設置されている。往き側通路４５ａには、湯水を急速に冷却可能なラジエータ６３が設置されている。往き側通路４５ａの燃料電池発電ユニット２側には、排熱回収用の循環ポンプ６４（図２参照）が設置されている。往き側通路４５ａと戻り側通路４５ｂとの間に、燃料電池発電ユニット２の熱交換器９の熱交換通路部９ａが接続されている。 A first bypass passage 51 is bypassed from the middle portion of the forward passage 45a to the middle portion of the return side passage 45b, and a hot water storage switching valve 62 is installed at this branch portion. A radiator 63 capable of rapidly cooling hot water is installed in the outward passage 45a. A circulation pump 64 (see FIG. 2) for recovering exhaust heat is installed on the fuel cell power generation unit 2 side of the forward passage 45a. The heat exchange passage portion 9a of the heat exchanger 9 of the fuel cell power generation unit 2 is connected between the forward passage 45a and the return passage 45b.
次に、給水通路４６について説明する。
図１に示すように、給水通路４６は、上水源から低温の上水を貯湯槽４１に供給するものであり、上流給水通路４６ａ、中間給水通路４６ｂ、下流給水通路４６ｃを有し、上流給水通路４６ａの上流端が上水源に接続され、貯湯槽４１の下部に下流給水通路４６ｃの下流端が接続されている。上流給水通路４６ａには減圧弁６７と給水温度センサ６５が設置され、中間給水通路４６ｂには逆止弁４６ｄが設置されている。中間給水通路４６ｂには、安全弁６８ａが設置された排水通路６８が接続され、この排水通路６８の下流端は、排水桝６９に延びている。尚、給水通路４６が「給水管」に相当する。
Next, the water supply passage 46 will be described.
As shown in FIG. 1, the water supply passage 46 supplies low temperature clean water from a water supply source to the hot water storage tank 41, and has an upstream water supply passage 46a, an intermediate water supply passage 46b, and a downstream water supply passage 46c. The upstream end of the passage 46 a is connected to a water source, and the downstream end of the downstream water supply passage 46 c is connected to the lower part of the hot water storage tank 41. A pressure reducing valve 67 and a water supply temperature sensor 65 are installed in the upstream water supply passage 46a, and a check valve 46d is installed in the intermediate water supply passage 46b. A drainage passage 68 provided with a safety valve 68 a is connected to the intermediate water supply passage 46 b, and a downstream end of the drainage passage 68 extends to a drainage basin 69. The water supply passage 46 corresponds to a “water supply pipe”.
給水通路４６において、中間給水通路４６ｂと下流給水通路４６ｃとの間から熱利用循環回路５０に接続する第２バイパス通路５２が分岐され、この分岐部には、中間給水通路４６ｂと下流給水通路４６ｃとの接続、中間給水通路４６ｂと第２バイパス通路５２との接続、第２バイパス通路５２と下流給水通路４６ｃとの接続を選択可能な蓄熱切換弁７１が設置されている。下流給水通路４６ｃから外部に排水可能な排水通路７２が分岐している。尚、蓄熱切換弁７１が「給水開閉弁」に相当する。蓄熱切換弁７１において、中間給水通路４６ｂと下流給水通路４６ｃとの接続を保持している状態が開弁状態であり、第２バイパス通路５２と下流給水通路４６ｃとの接続を保持している状態が閉弁状態である。 In the water supply passage 46, a second bypass passage 52 connected to the heat utilization circulation circuit 50 is branched from between the intermediate water supply passage 46b and the downstream water supply passage 46c, and the intermediate water supply passage 46b and the downstream water supply passage 46c are branched to this branch portion. The heat storage switching valve 71 is installed so that the connection between the intermediate water supply passage 46b and the second bypass passage 52 and the connection between the second bypass passage 52 and the downstream water supply passage 46c can be selected. A drainage passage 72 that can drain water from the downstream water supply passage 46c is branched. The heat storage switching valve 71 corresponds to a “water supply opening / closing valve”. In the heat storage switching valve 71, the state in which the connection between the intermediate water supply passage 46b and the downstream water supply passage 46c is maintained is the valve open state, and the state in which the connection between the second bypass passage 52 and the downstream water supply passage 46c is maintained. Is closed.
次に、出湯通路４７について説明する。
図１に示すように、出湯通路４７は、貯湯槽４１内に貯湯された湯水を風呂等の所望の給湯先に供給するものであり、高温の湯水が流れる上流出湯通路４７ａ、水と高温の湯水が混合された混合湯水が流れる中間出湯通路４７ｂ及び下流出湯通路４７ｃを有する。上流出湯通路４７ａの上流端が貯湯槽４１の上部に接続され、上流出湯通路４７ａの下流端に中間出湯通路４７ｂの上流端が接続され、中間出湯通路４７ｂの下流端に下流出湯通路４７ｃの上流端が接続され、下流出湯通路４７ｃの下流端に給湯栓７３が接続されている。
Next, the hot water passage 47 will be described.
As shown in FIG. 1, the hot water passage 47 is for supplying hot water stored in the hot water storage tank 41 to a desired hot water supply destination such as a bath. An intermediate hot water passage 47b and a lower effluent hot water passage 47c through which mixed hot water mixed with hot water is mixed. The upstream end of the upper hot water passage 47a is connected to the upper portion of the hot water storage tank 41, the upstream end of the intermediate hot water passage 47b is connected to the downstream end of the upper hot water passage 47a, and the lower outgoing hot water passage is connected to the downstream end of the intermediate hot water passage 47b. The upstream end of 47c is connected, and the hot-water tap 73 is connected to the downstream end of the lower effluent passage 47c.
上流出湯通路４７ａと中間出湯通路４７ｂとの間には混合弁７４が設置され、この混合弁７４に上流給水通路４６ａから分岐した第３バイパス通路５３が接続されている。混合弁７４は、出湯温度が指令温度になるように水と高温の湯水の混合比を制御するものである。尚、出湯通路４７が「出湯管」に相当する。 A mixing valve 74 is installed between the upper outlet hot water passage 47a and the intermediate hot water passage 47b, and a third bypass passage 53 branched from the upstream water supply passage 46a is connected to the mixing valve 74. The mixing valve 74 controls the mixing ratio of water and hot hot water so that the tapping temperature becomes the command temperature. The hot water passage 47 corresponds to a “hot water pipe”.
第３バイパス通路５３には、逆止弁５３ａが設置されている。第３バイパス通路５３から混合弁７４を介さずに中間出湯通路４７ｂへ直接接続する第４バイパス通路５４が分岐され、この第４バイパス通路５４には、高温回避電磁弁７８が設置されている。この第４バイパス通路５４によって、中間出湯通路４７ｂに上水源から低温の上水を直接供給することができる。 A check valve 53 a is installed in the third bypass passage 53. A fourth bypass passage 54 is directly branched from the third bypass passage 53 to the intermediate hot water passage 47 b without going through the mixing valve 74, and a high temperature avoidance electromagnetic valve 78 is installed in the fourth bypass passage 54. By the fourth bypass passage 54, low temperature clean water can be directly supplied from the clean water source to the intermediate tap water passage 47b.
中間出湯通路４７ｂには、流量センサ４７ｄ及び出湯水比例弁７５が設置され、出湯水比例弁７５の下流側から風呂給湯追焚回路４９へ接続する風呂注湯通路５５が分岐されている。風呂注湯通路５５には、流量センサ５５ａ、注湯電磁弁７６、逆止弁５５ｂが順に一体的に設置され、逆止弁５５ｂには逆流防止手段５５ｃが接続されている。尚、風呂注湯通路５５が「注湯配管」に相当する。 A flow rate sensor 47d and a hot water proportional valve 75 are installed in the intermediate hot water passage 47b, and a bath pouring passage 55 connected from the downstream side of the hot water proportional valve 75 to the bath hot water supply circuit 49 is branched. In the bath pouring passage 55, a flow sensor 55a, a pouring electromagnetic valve 76, and a check valve 55b are integrally installed in this order, and a check flow preventing means 55c is connected to the check valve 55b. The bath pouring passage 55 corresponds to “pouring piping”.
次に、風呂給湯追焚回路４９について説明する。
風呂給湯追焚回路４９は、風呂のお湯を追い焚きする回路であり、風呂往き側通路４９ａ、風呂戻り側通路４９ｂを有している。風呂往き側通路４９ａと風呂戻り側通路４９ｂとの間には、第２熱交換器４４の内部通路４４ｂが接続され、風呂戻り側通路４９ｂには、風呂水流スイッチ８４や風呂循環ポンプ８５等が設置されている。
Next, the bath hot water supply circuit 49 will be described.
The bath hot water supply circuit 49 is a circuit for chasing hot water in the bath, and includes a bath going-out side passage 49a and a bath return side passage 49b. An internal passage 44b of the second heat exchanger 44 is connected between the bath return side passage 49a and the bath return side passage 49b. The bath return flow passage 49b includes a bath water flow switch 84, a bath circulation pump 85, and the like. is set up.
風呂内のお湯は風呂循環ポンプ８５により風呂戻り側通路４９ｂへ送られ、第２熱交換器４４の内部通路４４ｂに送られて熱交換通路部４４ａにより加熱され、加熱されたお湯は、風呂往き側通路４９ａから風呂へ送り出される。必要に応じて、出湯通路４７から分岐した風呂注湯通路５５を介して、風呂戻り側通路４９ｂに湯水を補充することができる。 Hot water in the bath is sent to the bath return side passage 49b by the bath circulation pump 85, sent to the internal passage 44b of the second heat exchanger 44 and heated by the heat exchange passage portion 44a, and the heated hot water goes to the bath. It is sent out to the bath from the side passage 49a. If necessary, hot water can be replenished to the bath return side passage 49b via the bath pouring passage 55 branched from the hot water passage 47.
次に、制御ユニット９７について説明する。
燃料電池コージェネレーションシステム１は、制御ユニット９７によって制御される。各種の温度センサ、各種の流量センサ、水処理装置１１の水位スイッチ３９（図２参照）、膨張タンク８０の水位センサ８０ａ（図１参照）等の検出信号が制御ユニット９７に送信され、この制御ユニット９７により、燃料電池発電ユニット２と貯湯注湯装置３の動作、各種弁部材の切り換え、各種ポンプの作動・停止、各種開閉弁の開閉状態の切り換え等を制御し、各種運転（排熱回収運転、風呂注湯運転、風呂追い焚き運転、暖房運転、給湯運転等）を実行する。尚、制御ユニット９７が「制御手段」に相当する。
Next, the control unit 97 will be described.
The fuel cell cogeneration system 1 is controlled by a control unit 97. Detection signals from various temperature sensors, various flow sensors, the water level switch 39 of the water treatment device 11 (see FIG. 2), the water level sensor 80a of the expansion tank 80 (see FIG. 1), and the like are transmitted to the control unit 97. The unit 97 controls the operation of the fuel cell power generation unit 2 and the hot water pouring device 3, switching of various valve members, operation / stopping of various pumps, switching of the open / close state of various on-off valves, etc. Operation, bath pouring operation, bath chasing operation, heating operation, hot water supply operation, etc.). The control unit 97 corresponds to “control means”.
次に、この燃料電池コージェネレーションシステム１を設置後に試運転する際に、制御ユニット９７により自動的に行われる、循環加熱回路４５へ水張りする循環加熱回路水張り制御について、図３のフローチャートに基づいて説明する。尚、図中の符号Ｓｉ（ｉ=１，２，・・）は各ステップを示す。この循環加熱回路水張り制御の制御プログラムは、制御ユニット９７に予め格納されている。 Next, the circulation heating circuit water filling control for filling the circulation heating circuit 45, which is automatically performed by the control unit 97 when the fuel cell cogeneration system 1 is commissioned after installation, will be described based on the flowchart of FIG. To do. In the figure, the symbol Si (i = 1, 2,...) Indicates each step. A control program for this circulating heating circuit water filling control is stored in the control unit 97 in advance.
この貯湯給湯装置３に水張りを行う際には、注湯電磁弁７６を開放し且つ蓄熱切換弁７１を給水位置に切換えた状態（開弁状態）で、給水通路４６から貯湯槽４１に給水することで、風呂側へエア抜きしながら貯湯槽４１への水張りを行い、貯湯槽４１への水張りが完了したことを検知後に循環ポンプ６４を駆動して循環加熱回路４５への水張りを行う。 When the hot water storage hot water supply device 3 is filled with water, the hot water supply solenoid valve 76 is opened and the heat storage switching valve 71 is switched to the water supply position (opened state) to supply water from the water supply passage 46 to the hot water storage tank 41. Thus, the hot water tank 41 is filled with water while venting air to the bath side, and after the completion of the filling of the hot water tank 41 is detected, the circulation pump 64 is driven to fill the circulation heating circuit 45 with water.
図３のフローチャートにおいて、この制御が開始されると、最初にＳ１において、貯湯槽４１への水張りが自動的に行われる。この場合、注湯電磁弁７６が開弁され、蓄熱切換弁７１が貯湯槽４１へ給水する給水位置に保持され、貯湯切換弁６２が循環加熱回路４５の往き側通路４５ａを連通させる連通位置に保持され、循環ポンプ６４が停止状態に保持される。すると、貯湯槽４１と配管系に水張りされ、余剰の給水は貯湯槽４１から上流出湯通路４７ａと、中間出湯通路４７ｂと、風呂注湯通路５５を介して風呂へ排水される。 In the flowchart of FIG. 3, when this control is started, first, water filling to the hot water storage tank 41 is automatically performed in S1. In this case, the hot water solenoid valve 76 is opened, the heat storage switching valve 71 is held at the water supply position for supplying water to the hot water storage tank 41, and the hot water storage switching valve 62 is at the communication position for communicating the forward passage 45 a of the circulation heating circuit 45. The circulation pump 64 is held in a stopped state. Then, the hot water storage tank 41 and the piping system are filled with water, and surplus water is drained from the hot water storage tank 41 to the bath through the upper outlet hot water passage 47a, the intermediate hot water passage 47b, and the bath pouring passage 55.
次に、Ｓ２において流量センサ４７ｄの検出信号を読み込み、検出流量が定流量状態になった否か判定される（Ｓ３）。水張り実行中には貯湯槽４１や配管系からエア抜きされるため、流量センサ４７ｄで検出される流量が安定せず定流量状態にならない。しかし、貯湯槽４１や配管系への水張りが完了すると、流量センサ４７ｄで検出される流量が定流量状態になり、Ｓ３の判定がＹｅｓになると、Ｓ４へ移行する。 Next, the detection signal of the flow sensor 47d is read in S2, and it is determined whether or not the detected flow is in a constant flow state (S3). Since the hot water tank 41 and the piping system are evacuated during the water filling, the flow rate detected by the flow rate sensor 47d is not stable and does not become a constant flow rate state. However, when the filling of the hot water tank 41 and the piping system is completed, the flow rate detected by the flow rate sensor 47d becomes a constant flow rate state, and when the determination of S3 is Yes, the process proceeds to S4.
次に、Ｓ４において、蓄熱切換弁７１を第２バイパス通路５２と下流給水通路４６ｃとを接続する状態（給水停止位置）に切り換える、即ち、蓄熱切換弁７１を閉弁状態に設定することで、給水通路４６から貯湯槽４１への給水が停止される。尚、第２バイパス通路５２が接続される熱利用循環回路５０において、その途中部の各種開閉弁は閉弁状態に設定されているので、貯湯槽４１は満水状態を維持する。次に、Ｓ５において、循環ポンプ６４を駆動する。 Next, in S4, the heat storage switching valve 71 is switched to a state (water supply stop position) in which the second bypass passage 52 and the downstream water supply passage 46c are connected, that is, the heat storage switching valve 71 is set to a closed state. Water supply from the water supply passage 46 to the hot water storage tank 41 is stopped. In addition, in the heat utilization circulation circuit 50 to which the second bypass passage 52 is connected, various open / close valves in the middle thereof are set in a closed state, so that the hot water tank 41 is maintained in a full state. Next, in S5, the circulation pump 64 is driven.
次に、Ｓ６において、蓄熱切換弁７１を閉弁状態にした後、所定時間ｔａ（例えば、５秒）経過したか否か判定し、この判定がＮｏのうちはＳ６を繰り返し、その判定がＹｅｓになったら、Ｓ７において、蓄熱切換弁７１を中間給水通路４６ｂと下流給水通路４６ｃとを接続する位置（給水位置）に切り換える、即ち、蓄熱切換弁７１を開弁状態に設定することで、給水通路４６から貯湯槽４１への給水を再開する。 Next, in S6, after the heat storage switching valve 71 is closed, it is determined whether a predetermined time ta (for example, 5 seconds) has elapsed. If this determination is No, S6 is repeated, and the determination is Yes. Then, in S7, the heat storage switching valve 71 is switched to a position (water supply position) where the intermediate water supply passage 46b and the downstream water supply passage 46c are connected, that is, the heat storage switching valve 71 is set to an open state to supply water. Water supply from the passage 46 to the hot water storage tank 41 is resumed.
次に、Ｓ８において蓄熱切換弁７１を給水位置に切り換えてから所定時間ｔｂ（例えば、３０秒）経過したか否か判定し、その判定がＮｏのうちはＳ８を繰り返し、その判定がＹｅｓになったときには、Ｓ９へ移行する。尚、蓄熱切換弁７１を給水位置に切り換えた際の貯湯槽４１への給水圧の作用については後述する。 Next, in S8, it is determined whether or not a predetermined time tb (for example, 30 seconds) has elapsed since the heat storage switching valve 71 was switched to the water supply position. If the determination is No, S8 is repeated, and the determination is Yes. If so, the process proceeds to S9. In addition, the effect | action of the water supply pressure to the hot water storage tank 41 at the time of switching the heat storage switching valve 71 to a water supply position is mentioned later.
次に、Ｓ９において流量センサ４７ｄの検出流量を読み込んで検出流量が定流量状態になった否か判定される。循環加熱回路４５から貯湯槽４１に流入したエアが貯湯槽４１からエア抜きされている状態では、検出流量が定流量状態にならないため、Ｓ９の判定がＮｏとなるため、その場合は、Ｓ１０に移行し、蓄熱切換弁７１を再度閉弁状態にした後、Ｓ６へ戻ってＳ６以降を繰り返す。 Next, in S9, the flow rate detected by the flow rate sensor 47d is read to determine whether or not the detected flow rate has reached a constant flow rate state. In the state in which the air flowing into the hot water storage tank 41 from the circulation heating circuit 45 is vented from the hot water storage tank 41, the detected flow rate does not become a constant flow rate state, so the determination of S9 is No. Then, after the heat storage switching valve 71 is closed again, the process returns to S6 and S6 and subsequent steps are repeated.
循環加熱回路４５内のエアと貯湯槽４１内のエアが完全にエア抜きされると、Ｓ９の判定がＹｅｓとなるため、Ｓ９からＳ１１へ移行して、Ｓ１１において循環ポンプ６４を停止させる。次に、Ｓ１２において、循環加熱回路４５への水張りが完了したとして、この循環加熱回路水張り制御が終了する。 When the air in the circulation heating circuit 45 and the air in the hot water storage tank 41 are completely vented, the determination in S9 is Yes, so that the process proceeds from S9 to S11, and the circulation pump 64 is stopped in S11. Next, in S12, assuming that the water filling to the circulation heating circuit 45 is completed, the circulation heating circuit water filling control is finished.
次に、以上説明した循環加熱回路水張り制御の作用、効果について図４のタイムチャートに基づいて説明する。
貯湯槽４１及び配管系に水張りが完了した時点においては、循環加熱回路４５内にはエアが残留しており、貯湯槽４１内に給水圧が作用し、貯湯槽４１内の下部と上部の水圧の差圧（例えば１０ｋＰａ）が大きくなく、また、管路抵抗の影響もあるため、循環加熱回路４５の戻り側通路４５ｂへ水が流入し、循環加熱回路４５内の残留エアが循環ポンプ６４の所まで押し戻されることがある。
Next, the effect | action and effect of the circulating heating circuit water filling control demonstrated above are demonstrated based on the time chart of FIG.
At the time when filling of the hot water tank 41 and the piping system is completed, air remains in the circulation heating circuit 45, and the water supply pressure acts in the hot water tank 41, and the water pressure in the lower and upper parts of the hot water tank 41 is increased. The differential pressure (for example, 10 kPa) is not large, and there is an influence of the pipe resistance, so that water flows into the return side passage 45b of the circulation heating circuit 45, and the residual air in the circulation heating circuit 45 flows into the circulation pump 64. It may be pushed back to the place.
このため、循環ポンプ６４が水張り状態になっているとは限らず、循環ポンプ６４が水張りされない状態で、循環ポンプ６４を駆動しても空運転するだけで、エア抜きすることができない。 For this reason, the circulation pump 64 is not necessarily in a water-filled state, and even if the circulation pump 64 is driven in a state in which the circulation pump 64 is not water-filled, only the idle operation is performed and air cannot be removed.
そこで、循環ポンプ６４の駆動後に、蓄熱切換弁７１を所定時間ｔａの間給水停止位置（閉弁状態）に保持して、一時的に貯湯槽４１内の全体に給水圧を作用させない状態にし、その後、蓄熱切換弁７１を給水位置（開弁状態）に切り換えると、給水通路４６からの給水圧により貯湯槽４１の下部の水圧が瞬間的に上昇し、貯湯槽４１内の下部と上部の水圧の差圧が例えば２０ｋＰａ程度までパルス的に増大するため、往き側通路４５ａから戻り側通路４５ｂに流れる水流が発生し、循環ポンプ６４が水張りされた状態になる。 Therefore, after the circulation pump 64 is driven, the heat storage switching valve 71 is held at the water supply stop position (valve closed state) for a predetermined time ta to temporarily prevent the water supply pressure from acting on the entire hot water storage tank 41, Thereafter, when the heat storage switching valve 71 is switched to the water supply position (valve open state), the water pressure at the lower part of the hot water tank 41 is instantaneously increased by the water supply pressure from the water supply passage 46, and the water pressure at the lower and upper parts in the hot water tank 41 is increased. Is increased in a pulse manner to, for example, about 20 kPa, so that a water flow flowing from the forward side passage 45a to the return side passage 45b is generated, and the circulation pump 64 is filled with water.
循環ポンプ６４が水張りされた状態で、循環ポンプ６４を駆動することで、循環加熱回路４５内の残留エアを貯湯槽４１へ確実に排出し、貯湯槽４１から上流出湯通路４７ａと、中間出湯通路４７ｂと、風呂注湯通路５５を介して風呂へエア抜きすることができる。 By driving the circulation pump 64 in a state where the circulation pump 64 is filled with water, the residual air in the circulation heating circuit 45 is surely discharged to the hot water storage tank 41, and the upper effluent hot water passage 47a and the intermediate hot water from the hot water storage tank 41 are discharged. Air can be vented to the bath via the passage 47b and the bath pouring passage 55.
上記のように、貯湯槽４１への水張り完了後、循環ポンプ６４が駆動している状態でのＳ４，Ｓ７の蓄熱切換弁７１の閉開制御を行うことにより、循環加熱回路４５内のエアの大部分をエア抜きすることができる。しかし、循環加熱回路４５内に気泡状態のエアが残留している場合があるため、Ｓ４，Ｓ７とＳ１０，Ｓ７の蓄熱切換弁７１の閉開制御を複数回繰り返し行うことにより、循環加熱回路４５から完全にエア抜きし、循環加熱回路４５に確実に水張りすることができる。 As described above, after the water filling to the hot water storage tank 41 is completed, by performing the opening / closing control of the heat storage switching valve 71 of S4 and S7 with the circulation pump 64 being driven, the air in the circulation heating circuit 45 is controlled. Most can be vented. However, since air in a bubble state may remain in the circulation heating circuit 45, the circulation heating circuit 45 is repeatedly performed by repeating the closing and opening control of the heat storage switching valve 71 of S4, S7 and S10, S7 a plurality of times. The air can be completely removed from the air, and the circulating heating circuit 45 can be reliably filled with water.
以上説明したように、貯湯槽４１と配管系への水張りと、循環加熱回路４５への水張りは、制御ユニット９７により自動的に且つ能率的に行うことができるため、貯湯給湯装置３の試運転にかかる所要時間とコストを大幅に低減することができる。そして、循環加熱回路４５に水が循環しない状態で、燃料電池発電ユニット２を空焚き運転して燃料電池発電ユニット２を故障させてしまう虞もない。しかも、前記循環加熱回路水張り制御は、同様の構造の種々の貯湯給湯装置３に適用することができるため、汎用性に優れる。 As described above, the water filling to the hot water storage tank 41 and the piping system and the water filling to the circulation heating circuit 45 can be performed automatically and efficiently by the control unit 97. Such required time and cost can be greatly reduced. Then, there is no possibility that the fuel cell power generation unit 2 will be damaged by operating the fuel cell power generation unit 2 in the air without water circulating in the circulation heating circuit 45. In addition, the circulation heating circuit water filling control can be applied to various hot water storage and hot water supply apparatuses 3 having the same structure, and thus is excellent in versatility.
さらに、制御ユニット９７は、蓄熱切換弁７１の閉弁から所定時間ｔａ経過して貯湯槽４１内に給水圧が作用しなくなった状態で蓄熱切換弁７１を開弁状態に戻すので、貯湯槽４１の下部と上部の水圧の差圧を確実に発生させて、循環ポンプ６４を確実に水張り状態にすることができる。 Furthermore, since the control unit 97 returns the heat storage switching valve 71 to the open state in a state where a predetermined time ta has elapsed from the closing of the heat storage switching valve 71 and the supply water pressure no longer acts in the hot water storage tank 41, the hot water storage tank 41. Thus, the differential pressure between the lower and upper water pressures can be reliably generated, and the circulation pump 64 can be reliably in a water-filled state.
次に、前記実施例を部分的に変更する例について説明する。
［１］前記循環加熱回路水張り制御において、Ｓ４の蓄熱切換弁７１の給水停止位置への切換制御とＳ５の循環ポンプ６４の駆動制御とを入れ替え、先に循環ポンプ６４を駆動してから蓄熱切換弁７１を閉弁状態に切り換えても良いし、Ｓ４の蓄熱切換弁７１の給水停止位置への切換制御とＳ５の循環ポンプ６４の駆動制御を同時に実行しても良い。即ち、蓄熱切換弁７１を閉弁させてから開弁状態に戻すより前に、循環ポンプ６４を駆動させれば良い。
Next, an example in which the above embodiment is partially changed will be described.
[1] In the circulation heating circuit water filling control, the switching control of the heat storage switching valve 71 in S4 to the water supply stop position and the driving control of the circulation pump 64 in S5 are switched, and the heat storage switching is performed after the circulation pump 64 is driven first. The valve 71 may be switched to a closed state, or the switching control of the heat storage switching valve 71 in S4 to the water supply stop position and the driving control of the circulation pump 64 in S5 may be performed simultaneously. That is, the circulation pump 64 may be driven before the heat storage switching valve 71 is closed and then returned to the valve open state.
［２］前記循環加熱回路水張り制御において、Ｓ９，Ｓ１０を省略して、Ｓ８において所定時間ｔｂ経過後に循環加熱回路４５への水張りが完了したとして、循環ポンプ６４を停止させる、つまり、蓄熱切換弁７１の閉開駆動を複数回繰り返さずに蓄熱切換弁７１の閉開駆動を１回する制御であっても良い。 [2] In the circulation heating circuit water filling control, S9 and S10 are omitted, and the water pumping to the circulation heating circuit 45 is completed after a predetermined time tb has elapsed in S8. The control may be one in which the close / open drive of the heat storage switching valve 71 is performed once without repeating the close / open drive of 71 multiple times.
［３］前記循環加熱回路水張り制御において、循環加熱回路水張りの為に蓄熱切換弁７１を閉開駆動しているが、特に制御対象を蓄熱切換弁７１に限定する必要はなく、給水通路４６に開閉弁を新たに設け、蓄熱切換弁７１の開弁状態を保持したまま、前記開閉弁を閉開駆動して循環加熱回路水張り制御を実行しても良い。 [3] In the circulation heating circuit water filling control, the heat storage switching valve 71 is driven to close and open for the purpose of water filling of the circulation heating circuit, but it is not necessary to limit the control target to the heat storage switching valve 71 in particular. An on / off valve may be newly provided, and the on / off valve may be driven to close and open while the heat storage switching valve 71 is kept open to execute the circulating heating circuit water filling control.
［４］前記実施例では、燃料電池コージェネレーションシステム１の燃料電池発電ユニット２を熱源機とする貯湯給湯装置３を例にして説明したが、ヒートポンプやガスエンジンを熱源機とする貯湯給湯装置にも本発明を同様に適用することができる。 [4] In the above embodiment, the hot water storage hot water supply device 3 using the fuel cell power generation unit 2 of the fuel cell cogeneration system 1 as a heat source device has been described as an example. The present invention can be similarly applied.
［５］その他、当業者であれば、本発明の趣旨を逸脱することなく、前記実施例に種々の変更を付加した形態で実施可能であり、本発明はそのような変更形態を包含するものである。 [5] In addition, those skilled in the art can implement the present invention in various forms with various modifications without departing from the spirit of the present invention, and the present invention includes such modifications. It is.
１ 燃料電池コージェネレーションシステム
２ 燃料電池発電ユニット
３ 貯湯給湯装置
９ 熱交換器
４５ 循環加熱回路
４６ 給水通路
４７ 出湯通路
５５ 風呂注湯通路
６４ 循環ポンプ
７１ 蓄熱切換弁
７６ 注湯電磁弁
９７ 制御ユニット
DESCRIPTION OF SYMBOLS 1 Fuel cell cogeneration system 2 Fuel cell power generation unit 3 Hot water storage hot water supply apparatus 9 Heat exchanger 45 Circulation heating circuit 46 Water supply passage 47 Hot water supply passage 55 Bath pouring passage 64 Circulation pump 71 Heat storage switching valve 76 Pouring solenoid valve 97 Control unit
Claims (3)
前記貯湯槽の水張り完了後、前記給水開閉弁を閉弁させてから開弁状態に戻すと共に、前記開弁状態になる前に前記循環ポンプを駆動する制御手段を設けたことを特徴とする貯湯給湯装置。 A hot water storage tank, a circulation heating circuit that circulates and heats water from the lower part of the hot water tank to the upper part of the hot water tank via a heat source device, a circulation pump provided in the circulation heating circuit, and a lower part of the hot water tank A hot water pipe connected to the hot water pipe connected to the upper part, a hot water pipe connected to the upper part, a hot water pipe for branching from the hot water pipe and supplying hot water to the bathtub, a hot water solenoid valve provided in the hot water pipe, A hot water storage hot water supply device provided with a water supply opening / closing valve provided in the water supply pipe, and when water filling is performed on the hot water storage hot water supply device, the hot water solenoid valve and the water supply opening / closing valve are opened to release air. In the hot water storage and hot water supply apparatus for performing the water filling of the hot water storage tank, performing the water filling of the circulating heating circuit by driving the circulation pump after detecting the completion of the water filling of the hot water storage tank,
After completion of filling of the hot water storage tank, the water supply on / off valve is closed and then returned to the valve open state, and control means for driving the circulation pump before the valve open state is provided. Hot water supply device.
The hot water storage and hot water supply apparatus according to claim 1 or 2, wherein the control means repeatedly performs the opening / closing drive of the water supply opening / closing valve a plurality of times while the circulation pump is driven.
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| JP2015183965A (en) * | 2014-03-25 | 2015-10-22 | 大阪瓦斯株式会社 | Hot water supply system |
| JP2016031162A (en) * | 2014-07-25 | 2016-03-07 | 株式会社ノーリツ | Hot water storage and supply system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015183965A (en) * | 2014-03-25 | 2015-10-22 | 大阪瓦斯株式会社 | Hot water supply system |
| JP2016031162A (en) * | 2014-07-25 | 2016-03-07 | 株式会社ノーリツ | Hot water storage and supply system |
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