JP3990526B2

JP3990526B2 - Cogeneration system

Info

Publication number: JP3990526B2
Application number: JP2000063749A
Authority: JP
Inventors: 義孝栢原; 伸岩田; 桂嗣滝本; 豊吉田; 道久末平; 英明藤川
Original assignee: Osaka Gas Co Ltd
Current assignee: Osaka Gas Co Ltd
Priority date: 2000-03-08
Filing date: 2000-03-08
Publication date: 2007-10-17
Anticipated expiration: 2020-03-08
Also published as: JP2001248907A

Description

【０００１】
【発明の属する技術分野】
本発明は、発電機とガスエンジンとを一体化したものとか燃料電池といった熱電併給装置で発生する排熱を利用して、温度成層を形成する状態で貯湯タンク内に湯を貯め、その貯湯タンク内の湯を風呂に供給できるように構成したコージェネレーションシステムに関する。
【０００２】
【従来の技術】
この種のものは、貯湯タンク内に必要最小量の湯を貯めることにより、貯湯量の多さに比例する放熱を極力抑えるように構成されている。
ところが、浴槽への湯張りなどのように多量に出湯する場合に対応できるようにしようとすると、常にある程度の貯湯量を多くした状態に維持しなければならない。
【０００３】
そこで、従来、特公平５−８１８１１号（特開昭６１−５５５４５号）公報に示されるように、浴槽への湯張りなどのように多量に出湯する時間帯を設定し、その時間帯には貯湯量が多くなり、それ以外の時間帯は貯湯量が少なくなるように制御するものがある。
【０００４】
また、特開平４−３２４０５７号公報に示されるように、給湯負荷の経時的変化を給湯負荷パターンとして学習させ、その給湯負荷パターンに合うようにボイラーによる加熱制御を行うようにしたものがある。
【０００５】
【発明が解決しようとする課題】
しかしながら、上述従来例では、浴槽内に残り湯があるかどうか、また、その残り湯の量がどれくらいかといったことを実際の量で判断するものではなく、残り湯の有無や量的変動の影響を受け、無駄に貯湯したり、逆に湯が不足する湯切れを生じたりする欠点があった。
【０００６】
また、熱電併給装置からの排熱を利用する場合、熱電併給装置の筐体が大きいため、その運転開始時から所定の時間までの立ち上がりにおいて、発生した排熱が筐体や排熱を供給する配管などに吸収され、利用できる排熱量が少ない。
【０００７】
そのような排熱量の少ない状態での加熱を行うと、排熱利用の目的である本来の省エネルギー性や経済性が損なわれる欠点があった。
【０００８】
本発明は、このような事情に鑑みてなされたものであって、請求項１に係る発明は、湯張りを行うときに、浴槽内の実際の残り湯の量の変動に起因する湯切れを防止するとともに省エネルギー性および経済性を向上できるようにすることを目的とし、また、請求項２に係る発明は、学習機能や予約設定などによって特定時刻における貯湯タンク内への必要貯湯量が予め特定される場合に、湯張り終了後に必要貯湯量を確保し、湯切れおよび無駄な貯湯を回避するとともに省エネルギー性および経済性を向上できるようにすることを目的とし、また、請求項３に係る発明は、省エネルギー性および経済性を向上できながら、貯湯タンク内の貯湯量を少なくして放熱ロスを抑制できるようにすることを目的とする。
【０００９】
【課題を解決するための手段】
請求項１に係る発明は、上述のような目的を達成するために、
下部から取り出して上部から供給する循環配管を付設して温度成層を形成する状態で貯湯を行う貯湯タンクと、
前記循環配管に設けられて前記貯湯タンクから取り出した水を加熱する加熱手段と、
前記循環配管に設けられて前記貯湯タンクから水を取り出すとともに加熱後の湯を前記貯湯タンクに供給する循環ポンプと、
前記貯湯タンクに連通接続されて湯張り信号に応答して前記貯湯タンク内の湯を浴槽内に供給する湯張り手段とを備えたコージェネレーションシステムにおいて、
前記加熱手段が、少なくとも熱電併給装置の排熱を熱源とする排熱加熱手段を含み、
前記貯湯タンクに設けられて前記貯湯タンク内の湯の貯湯量を検出する貯湯量検出手段と、
前記浴槽内に貯める湯量を設定する湯量設定手段と、
前記浴槽内に貯められている実際の湯量を測定する実湯量測定手段と、
前記湯張り信号に応答して、前記湯量設定手段で設定された湯量から前記実湯量測定手段で測定された実際の湯量を減算して必要湯張り量を算出する必要湯張り量算出手段と、
前記貯湯量検出手段で検出された湯の貯湯量から前記必要湯張り量算出手段で算出された必要湯張り量を減算して前記貯湯タンク内の湯の残量を算出する残湯量算出手段と、
前記貯湯タンクの全容量から前記残湯量算出手段で算出された湯の残量を減算して前記貯湯タンクへの貯湯可能湯量を算出する貯湯可能湯量算出手段と、
前記貯湯可能湯量算出手段で算出された貯湯可能湯量と、前記熱電併給装置の特性を生かすに足る排熱優先設定値とを比較して貯湯可能湯量が排熱優先設定値よりも大きいときに排熱優先信号を出す比較手段と、
前記比較手段からの排熱優先信号に応答して前記排熱加熱手段および前記循環ポンプの運転許可信号を前記湯張り手段による湯の供給と同時あるいはほぼ同時に出力し、貯湯可能湯量分の加熱を行った後に運転許可信号を停止する加熱制御手段とを備えて構成する。
【００１０】
ここで、熱電併給装置の特性を生かすに足る排熱優先設定値とは、用いる熱電併給装置によって設定されるものである。
すなわち、その筐体の容積に伴う運転開始からの排熱の温度の立ち上がり状況と、立ち上がり後の連続運転時間とから、排熱回収効率と発電効率とを求め、それらから省エネルギー性および経済性の面から有用となる全体としての連続運転時間を湯量に換算した値が排熱優先設定値として設定される（以下、同じである）。
【００１１】
また、請求項２に係る発明は、前述のような目的を達成するために、
下部から取り出して上部から供給する循環配管を付設して温度成層を形成する状態で貯湯を行う貯湯タンクと、
前記循環配管に設けられて前記貯湯タンクから取り出した水を加熱する加熱手段と、
前記循環配管に設けられて前記貯湯タンクから水を取り出すとともに加熱後の湯を前記貯湯タンクに供給する循環ポンプと、
前記貯湯タンクに連通接続されて湯張り信号に応答して前記貯湯タンク内の湯を浴槽内に供給する湯張り手段とを備えたコージェネレーションシステムにおいて、
前記加熱手段が、少なくとも熱電併給装置の排熱を熱源とする排熱加熱手段を含み、
特定時刻における前記貯湯タンク内への必要貯湯量が予め特定されているものであり、
湯張り信号に応答して、前記湯張り手段による湯の供給停止時点での前記必要貯湯量から前記残湯量算出手段で算出された湯の残量を減算して前記貯湯タンクへの追加貯湯量を算出する追加貯湯量算出手段と、
前記追加貯湯量算出手段で算出された追加貯湯量と排熱優先設定値とを比較して追加貯湯量が排熱優先設定値よりも大きいときに第２の排熱優先信号を出す第２の比較手段と、
前記第２の比較手段からの第２の排熱優先信号に応答して前記排熱加熱手段および前記循環ポンプの運転許可信号を前記湯張り手段による湯の供給と同時あるいはほぼ同時に出力し、追加貯湯量分の加熱を行った後に運転許可信号を停止する第２の加熱制御手段とを備えて構成する。
【００１２】
特定時刻における貯湯タンク内への必要貯湯量が予め特定されるとは、例えば、学習機能によって、前日とか１週間前の同じ曜日の必要貯湯量の変動パターンによって特定するとか、予約機能などスケジュールタイマで設定した必要貯湯量の変動パターンによって特定するといったことである。
【００１３】
また、請求項３に係る発明は、前述のような目的を達成するために、
下部から取り出して上部から供給する循環配管を付設して温度成層を形成する状態で貯湯を行う貯湯タンクと、
前記循環配管に設けられて前記貯湯タンクから取り出した水を加熱する加熱手段と、
前記循環配管に設けられて前記貯湯タンクから水を取り出すとともに加熱後の湯を前記貯湯タンクに供給する循環ポンプと、
前記貯湯タンクに連通接続されて湯張り信号に応答して前記貯湯タンク内の湯を浴槽内に供給する湯張り手段とを備えたコージェネレーションシステムにおいて、
前記加熱手段が、少なくとも熱電併給装置の排熱を熱源とする排熱加熱手段を含み、
特定時刻における前記貯湯タンク内への必要貯湯量が予め特定されているものであり、
前記貯湯タンクに設けられて前記貯湯タンク内の湯の貯湯量を検出する貯湯量検出手段と、
前記浴槽内に貯める湯量を設定する湯量設定手段と、
前記浴槽内に貯められている実際の湯量を測定する実湯量測定手段と、
前記湯張り信号に応答して、前記湯量設定手段で設定された湯量から前記実湯量測定手段で測定された実際の湯量を減算して必要湯張り量を算出する必要湯張り量算出手段と、
前記貯湯量検出手段で検出された湯の貯湯量から前記必要湯張り量算出手段で算出された必要湯張り量を減算して前記貯湯タンク内の湯の残量を算出する残湯量算出手段と、
前記貯湯タンクの全容量から前記残湯量算出手段で算出された湯の残量を減算して前記貯湯タンクへの貯湯可能湯量を算出する貯湯可能湯量算出手段と、
湯張り信号に応答して、前記湯張り手段による湯の供給停止時点での前記必要貯湯量から前記残湯量算出手段で算出された湯の残量を減算して前記貯湯タンクへの追加貯湯量を算出する追加貯湯量算出手段と、
前記貯湯可能湯量算出手段で算出された貯湯可能湯量と前記追加貯湯量算出手段で算出された追加貯湯量とを比較し、小さい方の湯量を選択して出力する第３の比較手段と、
第３の比較手段で選択して出力された湯量と排熱優先設定値とを比較して湯量が排熱優先設定値よりも大きいときに第３の排熱優先信号を出す第４の比較手段と、
前記第４の比較手段からの第３の排熱優先信号に応答して前記排熱加熱手段および前記循環ポンプの運転許可信号を前記湯張り手段による湯の供給と同時あるいはほぼ同時に出力し、貯湯可能湯量または追加貯湯量のうちの少ない方の湯量分の加熱を行った後に運転許可信号を停止する第３の加熱制御手段とを備えて構成する。
【００１４】
【作用】
請求項１に係る発明のコージェネレーションシステムの構成によれば、例えば、浴槽への給湯を行うための操作を人為的に行うとか予約機能や学習機能によって自動的に開くなどにより、浴槽内に湯を供給する湯張り信号が出力されると、浴槽内に実際に貯められている湯量、すなわち、浴槽内の残り湯の量（実湯量）と貯めようとする設定湯量とから必要湯張り量を算出する。
一方、貯湯タンク内の湯の貯湯量から必要湯張り量を減算して湯張り後の湯の残量を求め、その残湯量分を差し引いて、貯湯タンク内に貯湯可能な湯量を求める。
得られた貯湯可能湯量と排熱優先設定値とを比較し、その貯湯可能湯量を得るために排熱加熱手段を運転したときに、省エネルギー性および経済性の面から有用かどうかを判断し、有用であると判断したとき、湯張り手段による湯の供給と同時に運転許可信号を出力して排熱加熱手段および循環ポンプの運転を許容し、省エネルギー性および経済性の面での有用性を確保した状態で排熱により湯を得ることができる。
【００１５】
また、請求項２に係る発明のコージェネレーションシステムの構成によれば、学習機能や予約機能などによって、特定時刻における貯湯タンク内への必要貯湯量が予め特定されているときに、浴槽内に湯を供給する湯張り信号の出力時に、食器の洗浄や乾燥などのための湯も必要であるときなどに、その必要貯湯量から貯湯タンク内の残湯量分を差し引いて追加貯湯量を求める。
得られた追加貯湯量と排熱優先設定値とを比較し、その追加貯湯量を得るために排熱加熱手段を運転したときに、省エネルギー性および経済性の面から有用かどうかを判断し、有用であると判断したとき、湯張り手段による湯の供給と同時に運転許可信号を出力して排熱加熱手段および循環ポンプの運転を許容し、省エネルギー性および経済性の面での有用性を確保した状態で排熱により湯を得ることができる。
【００１６】
また、請求項３に係る発明のコージェネレーションシステムの構成によれば、得られた貯湯可能湯量と追加貯湯量のいずれもが排熱優先設定値よりも大きいときに、小さい方の湯量に基づいて排熱により湯を得る。
【００１７】
【発明の実施の形態】
次に、本発明の実施例を図面に基づいて詳細に説明する。
図１は、本発明に係るコージェネレーションシステムの実施例を示す概略構成図であり、ガスエンジンによって発電機を駆動するように構成した熱電併給装置１と貯湯給湯器２とが、ジャケット冷却水の循環配管３と第１の熱交換器４とを介して接続され、貯湯、給湯および暖房に熱電併給装置１からの排熱を利用できるように構成されている。このジャケット冷却水の循環配管３と第１の熱交換器４とによって熱電併給装置１からの排熱を利用する構成をして排熱加熱手段と称する（後述する図２、図３および図４それぞれでは、便宜上排熱加熱手段の図番として熱電併給装置１と同じにして示す）。
【００１８】
貯湯給湯器２には、貯湯タンク５と、補助熱源機６と、補給水タンク７とが備えられている。
貯湯タンク５の下部から上部にわたって、循環ポンプ８を介装した循環配管９が設けられ、この循環配管９に第１の熱交換器４と補助熱源機６とが直列に設けられている。
【００１９】
以上の構成により、貯湯タンク５の下部から水を取り出し、熱電併給装置１からの排熱によって加熱し、その加熱後の湯を貯湯タンク５の上部から供給し、温度成層を形成する状態で貯湯を行うようになっている。
【００２０】
循環配管９には流量センサ１０と流量制御弁１１とが設けられている。
補助熱源機６は、加熱能力が高い専用熱源として都市ガスにより燃焼加熱するように構成され、熱電併給装置１からの排熱による加熱を行わないときに、または併用して、補助熱源機６による加熱を行い、貯湯、給湯および暖房用の湯を得るように構成されている。前述排熱加熱手段と補助熱源機６とによって、貯湯タンク５から取り出した水を加熱する加熱手段が構成されている。
【００２１】
循環配管９には、第１の熱交換器４および補助熱源機６と並列に出力用循環配管１３が接続され、その出力用循環配管１３に暖房用熱交換器１４と追い焚き用熱交換器１５が設けられている。
【００２２】
暖房用熱交換器１４には、補給水タンク７に接続される状態で第１のポンプ付き配管１６が接続され、第１のポンプ付き配管１６に取り出しヘッダー１７および戻りヘッダー１８を介して図示していない床暖房機、室内暖房機、浴室乾燥機などが接続されている。
【００２３】
追い焚き用熱交換器１５には、第２のポンプ付き配管１９を介して浴槽２０が接続され、追い焚きを行うように構成されている。
第２のポンプ付き配管１９には、浴槽２０内に貯められている実際の湯量を測定する実湯量測定手段としての圧力センサ２１が設けられている。
【００２４】
循環配管９および出力用循環配管１３と並列に、貯湯タンク５に給湯管２２が接続され、給湯管２２に分配弁２２ａ、流量制御弁２２ｂ、流量センサ２２ｃおよび開閉弁２２ｄが設けられるとともに、その給湯管２２が第２のポンプ付き配管１９に接続されている。これにより、貯湯タンク５から給湯管２２および第２のポンプ付き配管１９を介して浴槽２０内に所望温度の湯を供給できるように湯張り手段が構成されている。
【００２５】
給湯管２２の途中箇所には、シャワーに接続されるシャワー配管２２ｅが接続されている。分配弁２２ａには、給水管２３が接続され、湯量と給水量との分配比を調節することにより湯張り時の湯温度を調節できるようになっている。
【００２６】
貯湯タンク５に上下方向に間隔を隔てて５個の温度センサ２４ａ，２４ｂ，２４ｃ，２４ｄ，２４ｅが設けられ、例えば、80℃などの設定温度を感知した温度センサの位置によって貯湯タンク５内の湯の貯湯量を検出する貯湯量検出手段２５（図２参照）が構成されている。
【００２７】
浴室（図示せず）の側壁に取り付けられたタッチパネルに、浴槽２０内に貯める湯量を設定する湯量設定手段２６（図２参照）が設けられ、圧力センサ２１によって浴槽２０内に貯められた湯量が湯量設定手段２６で設定した湯量になったときに開閉弁２２ｄを自動的に閉じるように構成されている。
【００２８】
図２の第１実施例のブロック図に示すように、実湯量測定手段（圧力センサ）２１と貯湯量検出手段２５と湯量設定手段２６がマイクロコンピュータ２７に接続され、そのマイクロコンピュータ２７に熱電併給装置１と循環ポンプ８と湯張り手段を構成する開閉弁２２ｄが接続されている。
【００２９】
マイクロコンピュータ２７には、必要湯張り量算出手段２８、残湯量算出手段２９、貯湯可能湯量算出手段３０、比較手段３１、加熱制御手段３２が備えられている。
【００３０】
前述したタッチパネルにより流量調節可能に給湯操作可能に構成されており、その給湯操作に伴って湯張り信号を出力するとともに、給湯管２２に設けられた湯量センサ２２ｃと流量制御弁２２ｂとにより設定流量の給湯を行うように構成されている。
【００３１】
必要湯張り量算出手段２８は、湯張り信号に応答して、湯量設定手段２６で設定された湯量から実湯量測定手段２１で測定された実際の湯量を減算して必要湯張り量を算出するようになっている。
残湯量算出手段２９は、貯湯量検出手段２５で検出された湯の貯湯量から必要湯張り量算出手段２８で算出された必要湯張り量を減算して貯湯タンク５内の湯の残量を算出するようになっている。
貯湯可能湯量算出手段３０は、貯湯タンク５の全容量から残湯量算出手段２９で算出された湯の残量を減算して貯湯タンク５への貯湯可能湯量を算出するようになっている。
【００３２】
比較手段３１は、貯湯可能湯量算出手段３０で算出された貯湯可能湯量と、排熱優先設定値とを比較して貯湯可能湯量が排熱優先設定値よりも大きいときに排熱優先信号を出すようになっている。
上記排熱優先設定値は、用いる熱電併給装置１に応じてその熱電併給装置１の特性を生かすに足るように設定されるものである。
すなわち、熱電併給装置１を構成する筐体の容積に伴う運転開始からの排熱の温度の立ち上がり状況と、立ち上がり後の連続運転時間とから、排熱回収効率と発電効率とを求め、それらから省エネルギー性および経済性の面から有用となる全体としての連続運転時間が排熱優先設定値として設定される。
【００３３】
加熱制御手段３２は、比較手段３１からの排熱優先信号に応答して熱電併給装置１および循環ポンプ８の運転許可信号を出力するとともに同時に開閉弁２２ｄを開いて湯の供給を開始し、貯湯可能湯量分の加熱を行った後に運転許可信号を停止するようになっている。
【００３４】
以上の構成により、加熱制御手段３２では、排熱優先信号が入力されて熱電併給装置１の運転を開始した後は、湯張りが完了していても、排熱優先設定値として設定される連続運転時間分は運転を継続し、省エネルギー性および経済性を向上できる。
【００３５】
なお、上述した運転許可信号に応答しての運転動作としては、次の２形態のいずれかが採用される。このことは、以下の実施例でも同じである。
▲１▼運転許可信号に応答して熱電併給装置１および循環ポンプ８を運転する。
▲２▼運転許可信号に応答して、電力負荷が予め定められた設定値よりも大きいかどうか判断し、電力負荷が設定値よりも大きければ、熱電併給装置１および循環ポンプ８を運転し、電力負荷が設定値よりも小さければ、熱電併給装置１で発電される電力が消費されずに捨てられることとなって無駄になるため、運転許可信号を受けても、熱電併給装置１および循環ポンプ８を運転しないようにして経済性の向上を図る。
【００３６】
図３は第２実施例を示すブロック図であり、第１実施例と異なるところは次の通りである。
すなわち、第１実施例の構成に加えて、追加貯湯量算出手段３３、第２の比較手段３４、第２の加熱制御手段３５が備えられている。
追加貯湯量算出手段３３には、例えば、学習機能によって、前日とか１週間前の同じ曜日の必要貯湯量の変動パターンとか、予約機能などスケジュールタイマで設定した必要貯湯量の変動パターンなどによって特定される、特定時刻における貯湯タンク内への必要貯湯量が入力されていて、この追加貯湯量算出手段３３では、湯張り信号に応答して、浴槽２０への湯の供給停止時点での必要貯湯量から残湯量算出手段２９で算出された湯の残量を減算して貯湯タンク５への追加貯湯量を算出するようになっている。
【００３７】
第２の比較手段３４は、追加貯湯量算出手段３３で算出された追加貯湯量と前述排熱優先設定値とを比較して追加貯湯量が排熱優先設定値よりも大きいときに第２の排熱優先信号を出すようになっている。
【００３８】
第２の加熱制御手段３５は、第２の比較手段３４からの第２の排熱優先信号に応答して熱電併給装置１および循環ポンプ８の運転許可信号を出力するとともに同時に開閉弁２２ｄを開いて湯の供給を開始し、貯湯可能湯量分の加熱を行った後に運転許可信号を停止するようになっている。
【００３９】
以上の構成により、第２の加熱制御手段３５では、排熱優先信号が入力されて熱電併給装置１の運転を開始した後は、湯張りが完了していても、排熱優先設定値として設定される連続運転時間分は運転を継続し、省エネルギー性および経済性を向上できる。
【００４０】
図４は第３実施例を示すブロック図であり、第２実施例と異なるところは次の通りである。
すなわち、第２実施例の構成に加えて、更に、第３および第４の比較手段４１，４２ならびに第３の加熱制御手段４３が備えられている。
【００４１】
第３の比較手段４１は、貯湯可能湯量算出手段３０で算出された貯湯可能湯量と追加貯湯量算出手段３３で算出された追加貯湯量とを比較し、小さい方の湯量を選択して出力するようになっている。
【００４２】
第４の比較手段４２は、第３の比較手段４１で選択して出力された小さい方の湯量と前述排熱優先設定値とを比較して湯量が排熱優先設定値よりも大きいときに第３の排熱優先信号を出すようになっている。
【００４３】
第３の加熱制御手段４３は、第４の比較手段４２からの第３の排熱優先信号に応答して熱電併給装置１および循環ポンプ８の運転許可信号を出力するとともに同時に開閉弁２２ｄを開いて湯の供給を開始し、貯湯可能湯量と貯湯可能湯量のうちの少ない方の湯量分の加熱を行った後に運転許可信号を停止するようになっている。
【００４４】
この第３実施例の構成によれば、貯湯可能湯量と追加貯湯量のうち、いずれもが排熱優先設定値よりも大きい場合に、少ない方の湯量を選択するため、加熱完了後における貯湯タンク５内の貯湯量を少なくでき、放熱によるロスを抑制できて経済性を向上できる。
【００４５】
【発明の効果】
以上の説明から明らかなように、請求項１に係る発明のコージェネレーションシステムによれば、浴槽内に実際に貯められている実湯量、すなわち、浴槽内の残り湯の量を測定するとともに、貯湯タンク内の湯の貯湯量を検出し、それらの浴槽内の実湯量と貯湯タンク内の湯の貯湯量とに基づいて貯湯可能湯量を求め、その貯湯可能湯量に基づいて加熱制御するから、浴槽内の実際の残り湯の量の変動に起因する湯切れを防止できる。
しかも、貯湯可能湯量と排熱優先設定値とを比較し、その貯湯可能湯量を得るために排熱加熱手段を運転したときに、省エネルギー性および経済性の面から有用であると判断したときに、排熱により湯を得ることができるから、省エネルギー性および経済性を向上できる。
【００４６】
また、請求項２に係る発明のコージェネレーションシステムによれば、学習機能や予約機能などによって、特定時刻における貯湯タンク内への必要貯湯量が予め特定されているときには、浴槽内に湯を供給する湯張り信号の出力時に、必要貯湯量から貯湯タンク内の残湯量分を差し引いて追加貯湯量を求め、その追加貯湯量に基づいて加熱制御するから、湯張り終了後に必要貯湯量を確保し、湯切れおよび無駄な貯湯を回避できる。
しかも、追加貯湯量と排熱優先設定値とを比較し、その追加貯湯量を得るために排熱加熱手段を運転したときに、省エネルギー性および経済性の面から有用であると判断したときに排熱により湯を得ることができるから、省エネルギー性および経済性を向上できる。
【００４７】
また、請求項３に係る発明のコージェネレーションシステムによれば、得られた貯湯可能湯量と追加貯湯量のいずれもが排熱優先設定値よりも大きいときに、小さい方の湯量に基づいて排熱により湯を得ることができるから、加熱完了後における貯湯タンク内の貯湯量を少なくできて放熱ロスを抑制でき、省エネルギー性および経済性を一層向上できる。
【図面の簡単な説明】
【図１】本発明に係るコージェネレーションシステムの概略構成図である。
【図２】第１実施例を示すブロック図である。
【図３】第２実施例を示すブロック図である。
【図４】第３実施例を示すブロック図である。
【符号の説明】
１…熱電併給装置
４…第１の熱交換器
６…補助熱源機
８…循環ポンプ
９…循環配管
２０…浴槽
２１…実湯量測定手段としての圧力センサ
２２…給湯管（湯張り手段）
２２ｄ…開閉弁（湯張り手段）
２５…貯湯量検出手段
２６…湯量設定手段
２８…必要湯張り量算出手段
２９…残湯量算出手段
３０…貯湯可能湯量算出手段
３１…比較手段
３２…加熱制御手段
３３…追加貯湯量算出手段
３４…第２の比較手段
３５…第２の加熱制御手段
４１…第３の比較手段
４２…第４の比較手段
４３…加熱制御手段選択手段[0001]
BACKGROUND OF THE INVENTION
The present invention stores hot water in a hot water storage tank in a state in which temperature stratification is formed by utilizing exhaust heat generated by a combined heat and power device such as a generator and a gas engine or a fuel cell, and the hot water storage tank The present invention relates to a cogeneration system configured to supply hot water inside a bath.
[0002]
[Prior art]
This type is configured to suppress heat radiation proportional to the amount of hot water as much as possible by storing the minimum amount of hot water in the hot water storage tank.
However, in order to be able to cope with a case where a large amount of hot water is poured out, such as filling a bathtub, it is necessary to always maintain a certain amount of hot water storage.
[0003]
Therefore, as shown in Japanese Patent Publication No. 5-81811 (Japanese Patent Laid-Open No. Sho 61-55545), a time zone in which a large amount of hot water is poured out, such as filling a bathtub, is set. Some control is performed so that the amount of hot water storage increases and the amount of hot water storage decreases during other time periods.
[0004]
In addition, as disclosed in Japanese Patent Laid-Open No. 4-324057, there is a technique in which a change with time in a hot water supply load is learned as a hot water supply load pattern, and heating control by a boiler is performed so as to match the hot water supply load pattern.
[0005]
[Problems to be solved by the invention]
However, in the above-mentioned conventional example, it is not judged by the actual amount whether there is any remaining hot water in the bathtub and the amount of the remaining hot water. In other words, the hot water is stored wastefully, or conversely, the hot water runs out.
[0006]
In addition, when using exhaust heat from the combined heat and power supply device, since the housing of the combined heat and power supply device is large, the generated exhaust heat supplies the housing and exhaust heat from the start of operation until a predetermined time. The amount of waste heat that can be absorbed and used by piping is low.
[0007]
When heating is performed in such a state where the amount of exhaust heat is small, there is a drawback that the original energy saving and economical efficiency, which are the purpose of exhaust heat utilization, are impaired.
[0008]
This invention is made | formed in view of such a situation, and when the invention which concerns on Claim 1 performs hot water filling, when the hot water filling is carried out, the hot water shortage resulting from the fluctuation | variation of the quantity of the actual remaining hot water in a bathtub is carried out. The invention according to claim 2 is intended to prevent and improve the energy saving and economic efficiency, and the invention according to claim 2 specifies in advance the amount of hot water stored in the hot water storage tank at a specific time by a learning function or a reservation setting. The purpose of the present invention is to secure a necessary amount of hot water storage after completion of hot water filling, to avoid running out of hot water and useless hot water, and to improve energy saving and economic efficiency. An object of the present invention is to reduce heat loss by reducing the amount of hot water stored in a hot water storage tank while improving energy saving and economic efficiency.
[0009]
[Means for Solving the Problems]
In order to achieve the above-described object, the invention according to claim 1
A hot water storage tank that stores hot water in a state where a temperature stratification is formed by attaching a circulation pipe that is taken out from the lower part and supplied from the upper part,
Heating means provided in the circulation pipe for heating water taken out from the hot water storage tank;
A circulation pump which is provided in the circulation pipe and takes out water from the hot water storage tank and supplies hot water after heating to the hot water storage tank;
In a cogeneration system comprising a hot water filling means connected to the hot water storage tank and supplying hot water in the hot water storage tank into a bathtub in response to a hot water filling signal,
The heating means includes at least exhaust heat heating means using the exhaust heat of the combined heat and power supply device as a heat source,
A hot water storage amount detecting means provided in the hot water storage tank for detecting the hot water storage amount of the hot water in the hot water storage tank;
Hot water setting means for setting the amount of hot water stored in the bathtub;
An actual hot water measuring means for measuring the actual hot water stored in the bathtub;
In response to the hot water filling signal, necessary hot water filling amount calculating means for calculating the required hot water filling amount by subtracting the actual hot water amount measured by the actual hot water amount measuring means from the hot water amount set by the hot water amount setting means;
A remaining hot water amount calculating means for calculating a remaining hot water amount in the hot water storage tank by subtracting the required hot water amount calculated by the required hot water amount calculating means from the hot water storage amount detected by the hot water storage amount detecting means; ,
A hot water storage hot water amount calculating means for subtracting the remaining amount of hot water calculated by the remaining hot water amount calculating means from the total capacity of the hot water storage tank, and calculating a hot water storage possible hot water amount to the hot water storage tank;
When the hot water storage capacity calculated by the hot water storage capacity calculation means and the exhaust heat priority setting value sufficient to make use of the characteristics of the combined heat and power supply are compared, the hot water storage capacity is greater than the exhaust heat priority setting value. A comparison means for issuing a heat priority signal;
In response to the exhaust heat priority signal from the comparison means, the operation permission signal for the exhaust heat heating means and the circulation pump is output simultaneously or substantially simultaneously with the supply of hot water by the hot water filling means to heat up the amount of hot water that can be stored. And heating control means for stopping the operation permission signal after being performed.
[0010]
Here, the exhaust heat priority setting value sufficient to make the best use of the characteristics of the combined heat and power device is set by the combined heat and power device to be used.
In other words, exhaust heat recovery efficiency and power generation efficiency are obtained from the rising state of exhaust heat temperature from the start of operation according to the volume of the casing and the continuous operation time after the start, and energy saving and economic efficiency are obtained from them. A value obtained by converting the continuous operation time that is useful from the aspect into the amount of hot water is set as the exhaust heat priority setting value (hereinafter, the same).
[0011]
In order to achieve the above-described object, the invention according to claim 2
A hot water storage tank that stores hot water in a state where a temperature stratification is formed by attaching a circulation pipe that is taken out from the lower part and supplied from the upper part,
Heating means provided in the circulation pipe for heating water taken out from the hot water storage tank;
A circulation pump which is provided in the circulation pipe and takes out water from the hot water storage tank and supplies hot water after heating to the hot water storage tank;
In a cogeneration system comprising a hot water filling means connected to the hot water storage tank and supplying hot water in the hot water storage tank into a bathtub in response to a hot water filling signal,
The heating means includes at least exhaust heat heating means using the exhaust heat of the combined heat and power supply device as a heat source,
The required hot water storage amount in the hot water storage tank at a specific time is specified in advance,
In response to a hot water filling signal, an additional hot water storage amount to the hot water storage tank is obtained by subtracting the remaining hot water amount calculated by the remaining hot water amount calculating means from the required hot water storage amount at the time of stopping the hot water supply by the hot water filling means. Additional hot water storage amount calculating means for calculating
A second exhaust heat priority signal is output when the additional hot water storage amount calculated by the additional hot water storage amount calculating means and the exhaust heat priority setting value are compared and the additional hot water storage amount is greater than the exhaust heat priority setting value. A comparison means;
In response to a second exhaust heat priority signal from the second comparison means, an operation permission signal for the exhaust heat heating means and the circulation pump is output at the same time or substantially simultaneously with the hot water supply by the hot water filling means. And a second heating control means for stopping the operation permission signal after heating the hot water storage amount.
[0012]
The required hot water storage amount in the hot water storage tank at a specific time is specified in advance, for example, by a learning function, specified by the fluctuation pattern of the required hot water storage amount on the same day of the previous day or one week ago, or a schedule timer such as a reservation function It is specified by the fluctuation pattern of the required hot water storage amount set in.
[0013]
In order to achieve the above-described object, the invention according to claim 3
A hot water storage tank that stores hot water in a state where a temperature stratification is formed by attaching a circulation pipe that is taken out from the lower part and supplied from the upper part,
Heating means provided in the circulation pipe for heating water taken out from the hot water storage tank;
A circulation pump which is provided in the circulation pipe and takes out water from the hot water storage tank and supplies hot water after heating to the hot water storage tank;
In a cogeneration system comprising a hot water filling means connected to the hot water storage tank and supplying hot water in the hot water storage tank into a bathtub in response to a hot water filling signal,
The heating means includes at least exhaust heat heating means using the exhaust heat of the combined heat and power supply device as a heat source,
The required hot water storage amount in the hot water storage tank at a specific time is specified in advance,
A hot water storage amount detecting means provided in the hot water storage tank for detecting the hot water storage amount of the hot water in the hot water storage tank;
Hot water setting means for setting the amount of hot water stored in the bathtub;
An actual hot water measuring means for measuring the actual hot water stored in the bathtub;
In response to the hot water filling signal, necessary hot water filling amount calculating means for calculating the required hot water filling amount by subtracting the actual hot water amount measured by the actual hot water amount measuring means from the hot water amount set by the hot water amount setting means;
A remaining hot water amount calculating means for calculating a remaining hot water amount in the hot water storage tank by subtracting the required hot water amount calculated by the required hot water amount calculating means from the hot water storage amount detected by the hot water storage amount detecting means; ,
A hot water storage hot water amount calculating means for subtracting the remaining amount of hot water calculated by the remaining hot water amount calculating means from the total capacity of the hot water storage tank, and calculating a hot water storage possible hot water amount to the hot water storage tank;
In response to a hot water filling signal, an additional hot water storage amount to the hot water storage tank is obtained by subtracting the remaining hot water amount calculated by the remaining hot water amount calculating means from the required hot water storage amount at the time of stopping the hot water supply by the hot water filling means. Additional hot water storage amount calculating means for calculating
A third comparison means for comparing the hot water storage capacity calculated by the hot water storage capacity calculation means with the additional hot water storage volume calculated by the additional hot water storage calculation means, and selecting and outputting the smaller hot water volume;
A fourth comparison means for comparing the amount of hot water selected and output by the third comparison means with the exhaust heat priority set value and issuing a third exhaust heat priority signal when the amount of hot water is greater than the exhaust heat priority set value. When,
In response to a third exhaust heat priority signal from the fourth comparison means, an operation permission signal for the exhaust heat heating means and the circulation pump is output simultaneously or substantially simultaneously with the supply of hot water by the hot water filling means, And third heating control means for stopping the operation permission signal after heating the smaller hot water amount of the available hot water amount or the additional hot water storage amount.
[0014]
[Action]
According to the configuration of the cogeneration system of the invention according to claim 1, for example, hot water in the bathtub is obtained by performing an operation for performing hot water supply to the bathtub artificially or automatically opening by a reservation function or a learning function. When the hot water filling signal is supplied, the required hot water amount is calculated from the amount of hot water actually stored in the bathtub, that is, the amount of hot water remaining in the bathtub (actual hot water amount) and the set hot water amount to be stored. calculate.
On the other hand, the remaining amount of hot water is obtained by subtracting the required amount of hot water from the amount of hot water in the hot water storage tank, and the amount of hot water that can be stored in the hot water tank is obtained by subtracting the remaining amount of hot water.
Compare the amount of hot water that can be stored and the waste heat priority set value, and when operating the exhaust heat heating means to obtain the amount of hot water that can be stored, determine whether it is useful in terms of energy saving and economy, When it is judged useful, the operation permission signal is output simultaneously with the hot water supply by the hot water filling means to allow the operation of the exhaust heat heating means and the circulation pump, ensuring the usefulness in terms of energy saving and economy. In this state, hot water can be obtained by exhaust heat.
[0015]
Further, according to the configuration of the cogeneration system of the invention according to claim 2, when the necessary hot water storage amount in the hot water storage tank at the specific time is specified in advance by the learning function or the reservation function, the hot water is stored in the bathtub. When a hot water filling signal is supplied to supply hot water for washing or drying dishes, the additional hot water storage amount is obtained by subtracting the remaining hot water amount in the hot water storage tank from the required hot water storage amount.
Compare the amount of additional hot water obtained and the waste heat priority set value, and determine whether it is useful from the aspect of energy saving and economy when operating the waste heat heating means to obtain the additional hot water storage amount, When it is judged useful, the operation permission signal is output simultaneously with the hot water supply by the hot water filling means to allow the operation of the exhaust heat heating means and the circulation pump, ensuring the usefulness in terms of energy saving and economy. In this state, hot water can be obtained by exhaust heat.
[0016]
Further, according to the configuration of the cogeneration system of the invention according to claim 3, when both of the obtained hot water storage capacity and the additional hot water storage volume are larger than the exhaust heat priority set value, the smaller hot water volume is used. Hot water is obtained by exhaust heat.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a schematic configuration diagram showing an embodiment of a cogeneration system according to the present invention, in which a combined heat and power supply device 1 and a hot water storage hot water supply device 2 configured to drive a generator by a gas engine include jacket cooling water. It connects via the circulation piping 3 and the 1st heat exchanger 4, and is comprised so that the waste heat from the cogeneration apparatus 1 can be utilized for hot water storage, hot water supply, and heating. The jacket cooling water circulation pipe 3 and the first heat exchanger 4 are configured to utilize the exhaust heat from the combined heat and power supply apparatus 1 and are referred to as exhaust heat heating means (described later with reference to FIGS. 2, 3 and 4). In each case, the exhaust heat heating means is shown as the figure number of the exhaust heat heating means for the sake of convenience).
[0018]
The hot water storage water heater 2 includes a hot water storage tank 5, an auxiliary heat source unit 6, and a makeup water tank 7.
A circulation pipe 9 including a circulation pump 8 is provided from the lower part to the upper part of the hot water storage tank 5, and the first heat exchanger 4 and the auxiliary heat source unit 6 are provided in series in the circulation pipe 9.
[0019]
With the above configuration, water is taken out from the lower part of the hot water storage tank 5 and heated by exhaust heat from the combined heat and power supply device 1, and hot water after the heating is supplied from the upper part of the hot water storage tank 5 to form a temperature stratification. Is supposed to do.
[0020]
The circulation pipe 9 is provided with a flow sensor 10 and a flow control valve 11.
The auxiliary heat source unit 6 is configured to burn and heat with city gas as a dedicated heat source having a high heating capacity, and when the heating by the exhaust heat from the combined heat and power supply apparatus 1 is not performed or in combination, the auxiliary heat source unit 6 It is configured to perform heating and obtain hot water for hot water storage, hot water supply and heating. The exhaust heat heating means and the auxiliary heat source unit 6 constitute a heating means for heating the water taken out from the hot water storage tank 5.
[0021]
An output circulation pipe 13 is connected to the circulation pipe 9 in parallel with the first heat exchanger 4 and the auxiliary heat source unit 6, and a heating heat exchanger 14 and a reheating heat exchanger are connected to the output circulation pipe 13. 15 is provided.
[0022]
The heating heat exchanger 14 is connected to a first pump-equipped pipe 16 in a state of being connected to the makeup water tank 7, and the first pump-equipped pipe 16 is illustrated via a take-out header 17 and a return header 18. Not floor heaters, indoor heaters, bathroom dryers, etc. are connected.
[0023]
The reheating heat exchanger 15 is connected to a bathtub 20 via a second pipe 19 with a pump, and is configured to reheat.
The second pump-equipped pipe 19 is provided with a pressure sensor 21 as an actual hot water amount measuring means for measuring an actual hot water amount stored in the bathtub 20.
[0024]
In parallel with the circulation pipe 9 and the output circulation pipe 13, a hot water supply pipe 22 is connected to the hot water storage tank 5, and a distribution valve 22a, a flow rate control valve 22b, a flow rate sensor 22c, and an on-off valve 22d are provided in the hot water supply pipe 22. A hot water supply pipe 22 is connected to the second pumped pipe 19. Thus, hot water filling means is configured so that hot water of a desired temperature can be supplied from the hot water storage tank 5 into the bathtub 20 through the hot water supply pipe 22 and the second pipe 19 with pump.
[0025]
A shower pipe 22 e connected to the shower is connected to a midpoint of the hot water supply pipe 22. A water supply pipe 23 is connected to the distribution valve 22a, and the hot water temperature at the time of filling can be adjusted by adjusting the distribution ratio between the amount of hot water and the amount of water supply.
[0026]
Five temperature sensors 24a, 24b, 24c, 24d, and 24e are provided in the hot water storage tank 5 at intervals in the vertical direction. For example, depending on the position of the temperature sensor that senses a set temperature such as 80 ° C., Hot water storage amount detection means 25 (see FIG. 2) for detecting the hot water storage amount is configured.
[0027]
The touch panel attached to the side wall of the bathroom (not shown) is provided with hot water setting means 26 (see FIG. 2) for setting the amount of hot water stored in the bathtub 20, and the amount of hot water stored in the bathtub 20 by the pressure sensor 21 is set. The on-off valve 22d is automatically closed when the amount of hot water set by the hot water setting means 26 is reached.
[0028]
As shown in the block diagram of the first embodiment of FIG. 2, the actual hot water measuring means (pressure sensor) 21, the hot water storage amount detecting means 25, and the hot water amount setting means 26 are connected to a microcomputer 27, and the microcomputer 27 is supplied with both heat and electricity. The opening / closing valve 22d which comprises the apparatus 1, the circulation pump 8, and a hot water filling means is connected.
[0029]
The microcomputer 27 is provided with necessary hot water filling amount calculation means 28, remaining hot water amount calculation means 29, hot water storage capacity calculation means 30, comparison means 31, and heating control means 32.
[0030]
The above-described touch panel is configured so that the hot water supply operation is possible so that the flow rate can be adjusted, and a hot water filling signal is output along with the hot water supply operation, and the set flow rate is set by the hot water amount sensor 22c and the flow rate control valve 22b provided in the hot water supply pipe 22. It is configured to perform hot water supply.
[0031]
In response to the hot water filling signal, the necessary hot water amount calculating means 28 calculates the required hot water amount by subtracting the actual hot water amount measured by the actual hot water amount measuring means 21 from the hot water amount set by the hot water amount setting means 26. It is like that.
The remaining hot water amount calculating means 29 subtracts the required hot water filling amount calculated by the required hot water amount calculating means 28 from the hot water storage amount detected by the hot water storage amount detecting means 25 to obtain the remaining amount of hot water in the hot water storage tank 5. It comes to calculate.
The hot water storage capacity calculation means 30 subtracts the remaining amount of hot water calculated by the remaining hot water volume calculation means 29 from the total capacity of the hot water storage tank 5 to calculate the hot water storage capacity of the hot water storage tank 5.
[0032]
Comparing means 31 compares the amount of hot water storable hot water calculated by hot water storable water amount calculating means 30 with the exhaust heat priority set value, and outputs a waste heat priority signal when the amount of hot water storable hot water is larger than the exhaust heat priority set value. It is like that.
The exhaust heat priority set value is set so as to make full use of the characteristics of the combined heat and power supply device 1 according to the combined heat and power supply device 1 used.
That is, the exhaust heat recovery efficiency and the power generation efficiency are obtained from the rising state of the exhaust heat temperature from the start of operation according to the volume of the casing constituting the combined heat and power supply apparatus 1 and the continuous operation time after the start, The overall continuous operation time that is useful in terms of energy saving and economy is set as the exhaust heat priority setting value.
[0033]
The heating control means 32 responds to the exhaust heat priority signal from the comparison means 31 and outputs operation permission signals for the combined heat and power supply device 1 and the circulation pump 8 and simultaneously opens the on-off valve 22d to start supplying hot water. The operation permission signal is stopped after heating the available amount of hot water.
[0034]
With the above configuration, in the heating control unit 32, after the exhaust heat priority signal is input and the operation of the combined heat and power supply apparatus 1 is started, the continuous setting that is set as the exhaust heat priority setting value is performed even if the hot water filling is completed. The operation can be continued for the operation time, and energy saving and economy can be improved.
[0035]
In addition, either of the following 2 forms is employ | adopted as a driving | running operation | movement in response to the driving | operation permission signal mentioned above. This also applies to the following embodiments.
(1) The cogeneration apparatus 1 and the circulation pump 8 are operated in response to the operation permission signal.
(2) In response to the operation permission signal, it is determined whether the power load is larger than a predetermined set value. If the power load is larger than the set value, the cogeneration apparatus 1 and the circulation pump 8 are operated, If the electric power load is smaller than the set value, the electric power generated by the combined heat and power supply device 1 is discarded without being consumed, and is wasted. Therefore, even if the operation permission signal is received, the combined heat and power supply device 1 and the circulation pump The economy is improved by not driving the 8.
[0036]
FIG. 3 is a block diagram showing the second embodiment. The differences from the first embodiment are as follows.
That is, in addition to the configuration of the first embodiment, an additional hot water storage amount calculation means 33, a second comparison means 34, and a second heating control means 35 are provided.
The additional hot water storage amount calculating means 33 is specified by, for example, the learning function based on the fluctuation pattern of the required hot water amount on the same day the previous day or one week ago, or the fluctuation pattern of the required hot water storage amount set by the schedule timer such as the reservation function. The required hot water storage amount in the hot water storage tank at a specific time is input, and this additional hot water storage amount calculating means 33 responds to the hot water filling signal and the required hot water storage amount at the time when the hot water supply to the bathtub 20 is stopped. The amount of hot water stored in the hot water storage tank 5 is calculated by subtracting the remaining amount of hot water calculated by the remaining hot water amount calculating means 29 from the hot water storage tank 5.
[0037]
The second comparison unit 34 compares the additional hot water storage amount calculated by the additional hot water storage amount calculation unit 33 with the above-described exhaust heat priority setting value, and when the additional hot water storage amount is larger than the exhaust heat priority setting value, An exhaust heat priority signal is output.
[0038]
In response to the second exhaust heat priority signal from the second comparison means 34, the second heating control means 35 outputs operation permission signals for the combined heat and power supply device 1 and the circulation pump 8, and simultaneously opens the on-off valve 22d. The hot water supply is started, and the operation permission signal is stopped after heating for the amount of hot water that can be stored.
[0039]
With the above configuration, after the exhaust heat priority signal is input and the operation of the combined heat and power supply apparatus 1 is started in the second heating control unit 35, the second heat control unit 35 is set as the exhaust heat priority set value even if the hot water filling is completed. The continuous operation time can be continued and energy saving and economic efficiency can be improved.
[0040]
FIG. 4 is a block diagram showing the third embodiment. The differences from the second embodiment are as follows.
That is, in addition to the configuration of the second embodiment, third and fourth comparison means 41 and 42 and third heating control means 43 are further provided.
[0041]
The third comparison means 41 compares the hot water storage capacity calculated by the hot water storage capacity calculation means 30 and the additional hot water storage capacity calculated by the additional hot water storage calculation section 33, and selects and outputs the smaller hot water volume. It is like that.
[0042]
The fourth comparison means 42 compares the smaller amount of hot water selected and output by the third comparison means 41 with the aforementioned exhaust heat priority set value, and when the amount of hot water is greater than the exhaust heat priority set value, The exhaust heat priority signal 3 is output.
[0043]
In response to the third exhaust heat priority signal from the fourth comparison means 42, the third heating control means 43 outputs an operation permission signal for the combined heat and power supply device 1 and the circulation pump 8, and simultaneously opens the on-off valve 22d. The hot water supply is started, and the operation permission signal is stopped after the amount of hot water that can be stored is less than the amount of hot water that can be stored.
[0044]
According to the configuration of the third embodiment, the hot water storage tank after completion of heating is selected in order to select the smaller hot water amount when the hot water storage amount and the additional hot water storage amount are both larger than the exhaust heat priority setting value. The amount of hot water stored in 5 can be reduced, loss due to heat radiation can be suppressed, and the economy can be improved.
[0045]
【The invention's effect】
As apparent from the above description, according to the cogeneration system of the invention according to claim 1, while measuring the amount of actual hot water actually stored in the bathtub, that is, the amount of remaining hot water in the bathtub, Since the amount of hot water stored in the tank is detected, the amount of hot water that can be stored is determined based on the actual amount of hot water in those bathtubs and the amount of hot water stored in the hot water storage tank, and heating control is performed based on the amount of hot water that can be stored. It is possible to prevent running out of hot water caused by fluctuations in the actual amount of remaining hot water.
Moreover, when it is judged that it is useful from the aspect of energy saving and economy, when comparing the hot water storage capacity and the exhaust heat priority set value, and operating the exhaust heat heating means to obtain the hot water storage capacity Since hot water can be obtained by exhaust heat, energy saving and economic efficiency can be improved.
[0046]
According to the cogeneration system of the invention according to claim 2, hot water is supplied into the bathtub when the required hot water storage amount in the hot water storage tank at a specific time is specified in advance by a learning function or a reservation function. When the hot water filling signal is output, the amount of remaining hot water in the hot water storage tank is subtracted from the required hot water storage amount to obtain the additional hot water storage amount, and heating control is performed based on the additional hot water storage amount. It can avoid running out of hot water and wasteful hot water storage.
In addition, when comparing the additional hot water storage amount with the waste heat priority setting value and operating the exhaust heat heating means to obtain the additional hot water storage amount, when it is determined that it is useful from the aspect of energy saving and economy Since hot water can be obtained by exhaust heat, energy saving and economic efficiency can be improved.
[0047]
According to the cogeneration system of the invention according to claim 3, when both of the obtained hot water storage capacity and the additional hot water storage volume are larger than the exhaust heat priority set value, the exhaust heat is based on the smaller hot water volume. Therefore, the amount of hot water stored in the hot water storage tank after completion of heating can be reduced, heat dissipation loss can be suppressed, and energy saving and economic efficiency can be further improved.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a cogeneration system according to the present invention.
FIG. 2 is a block diagram showing a first embodiment.
FIG. 3 is a block diagram showing a second embodiment.
FIG. 4 is a block diagram showing a third embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Combined heat and power supply device 4 ... 1st heat exchanger 6 ... Auxiliary heat source machine 8 ... Circulation pump 9 ... Circulation piping 20 ... Bath 21 ... Pressure sensor 22 as actual hot water measuring means ... Hot water supply pipe (hot water filling means)
22d ... On-off valve (water filling means)
25 ... Hot water storage amount detection means 26 ... Hot water amount setting means 28 ... Necessary hot water filling amount calculation means 29 ... Remaining hot water amount calculation means 30 ... Hot water storage available hot water volume calculation means 31 ... Comparison means 32 ... Heating control means 33 ... Additional hot water storage amount calculation means 34 ... Second comparison means 35 ... second heating control means 41 ... third comparison means 42 ... fourth comparison means 43 ... heating control means selection means

Claims

A hot water storage tank that stores hot water in a state where a temperature stratification is formed by attaching a circulation pipe that is taken out from the lower part and supplied from the upper part,
Heating means provided in the circulation pipe for heating water taken out from the hot water storage tank;
A circulation pump which is provided in the circulation pipe and takes out water from the hot water storage tank and supplies hot water after heating to the hot water storage tank;
In a cogeneration system comprising a hot water filling means connected to the hot water storage tank and supplying hot water in the hot water storage tank into a bathtub in response to a hot water filling signal,
The heating means includes at least exhaust heat heating means using the exhaust heat of the combined heat and power supply device as a heat source,
A hot water storage amount detecting means provided in the hot water storage tank for detecting the hot water storage amount of the hot water in the hot water storage tank;
Hot water setting means for setting the amount of hot water stored in the bathtub;
An actual hot water measuring means for measuring the actual hot water stored in the bathtub;
In response to the hot water filling signal, necessary hot water filling amount calculating means for calculating the required hot water filling amount by subtracting the actual hot water amount measured by the actual hot water amount measuring means from the hot water amount set by the hot water amount setting means;
A remaining hot water amount calculating means for calculating a remaining hot water amount in the hot water storage tank by subtracting the required hot water amount calculated by the required hot water amount calculating means from the hot water storage amount detected by the hot water storage amount detecting means; ,
A hot water storage hot water amount calculating means for subtracting the remaining amount of hot water calculated by the remaining hot water amount calculating means from the total capacity of the hot water storage tank, and calculating a hot water storage possible hot water amount to the hot water storage tank;
When the hot water storage capacity calculated by the hot water storage capacity calculation means and the exhaust heat priority setting value sufficient to make use of the characteristics of the combined heat and power supply are compared, the hot water storage capacity is greater than the exhaust heat priority setting value. A comparison means for issuing a heat priority signal;
In response to the exhaust heat priority signal from the comparison means, the operation permission signal for the exhaust heat heating means and the circulation pump is output simultaneously or substantially simultaneously with the supply of hot water by the hot water filling means to heat up the amount of hot water that can be stored. A cogeneration system comprising heating control means for stopping an operation permission signal after being performed.

A hot water storage tank that stores hot water in a state where a temperature stratification is formed by attaching a circulation pipe that is taken out from the lower part and supplied from the upper part,
Heating means provided in the circulation pipe for heating water taken out from the hot water storage tank;
A circulation pump which is provided in the circulation pipe and takes out water from the hot water storage tank and supplies hot water after heating to the hot water storage tank;
In a cogeneration system comprising a hot water filling means connected to the hot water storage tank and supplying hot water in the hot water storage tank into a bathtub in response to a hot water filling signal,
The heating means includes at least exhaust heat heating means using the exhaust heat of the combined heat and power supply device as a heat source,
The required hot water storage amount in the hot water storage tank at a specific time is specified in advance,
In response to a hot water filling signal, an additional hot water storage amount to the hot water storage tank is obtained by subtracting the remaining hot water amount calculated by the remaining hot water amount calculating means from the required hot water storage amount at the time of stopping the hot water supply by the hot water filling means. Additional hot water storage amount calculating means for calculating
A second exhaust heat priority signal is output when the additional hot water storage amount calculated by the additional hot water storage amount calculating means and the exhaust heat priority setting value are compared and the additional hot water storage amount is greater than the exhaust heat priority setting value. A comparison means;
In response to a second exhaust heat priority signal from the second comparison means, an operation permission signal for the exhaust heat heating means and the circulation pump is output at the same time or substantially simultaneously with the hot water supply by the hot water filling means. A cogeneration system comprising: a second heating control means for stopping the operation permission signal after heating the hot water storage amount.

A hot water storage tank that stores hot water in a state where a temperature stratification is formed by attaching a circulation pipe that is taken out from the lower part and supplied from the upper part,
Heating means provided in the circulation pipe for heating water taken out from the hot water storage tank;
A circulation pump which is provided in the circulation pipe and takes out water from the hot water storage tank and supplies hot water after heating to the hot water storage tank;
In a cogeneration system comprising a hot water filling means connected to the hot water storage tank and supplying hot water in the hot water storage tank into a bathtub in response to a hot water filling signal,
The heating means includes at least exhaust heat heating means using the exhaust heat of the combined heat and power supply device as a heat source,
The required hot water storage amount in the hot water storage tank at a specific time is specified in advance,
A hot water storage amount detecting means provided in the hot water storage tank for detecting the hot water storage amount of the hot water in the hot water storage tank;
Hot water setting means for setting the amount of hot water stored in the bathtub;
An actual hot water measuring means for measuring the actual hot water stored in the bathtub;
In response to the hot water filling signal, necessary hot water filling amount calculating means for calculating the required hot water filling amount by subtracting the actual hot water amount measured by the actual hot water amount measuring means from the hot water amount set by the hot water amount setting means;
A remaining hot water amount calculating means for calculating a remaining hot water amount in the hot water storage tank by subtracting the required hot water amount calculated by the required hot water amount calculating means from the hot water storage amount detected by the hot water storage amount detecting means; ,
A hot water storage hot water amount calculating means for subtracting the remaining amount of hot water calculated by the remaining hot water amount calculating means from the total capacity of the hot water storage tank, and calculating a hot water storage possible hot water amount to the hot water storage tank;
In response to a hot water filling signal, an additional hot water storage amount to the hot water storage tank is obtained by subtracting the remaining hot water amount calculated by the remaining hot water amount calculating means from the required hot water storage amount at the time of stopping the hot water supply by the hot water filling means. Additional hot water storage amount calculating means for calculating
A third comparison means for comparing the hot water storage capacity calculated by the hot water storage capacity calculation means with the additional hot water storage volume calculated by the additional hot water storage calculation means, and selecting and outputting the smaller hot water volume;
A fourth comparison means for comparing the amount of hot water selected and output by the third comparison means with the exhaust heat priority set value and issuing a third exhaust heat priority signal when the amount of hot water is greater than the exhaust heat priority set value. When,
In response to a third exhaust heat priority signal from the fourth comparison means, an operation permission signal for the exhaust heat heating means and the circulation pump is output simultaneously or substantially simultaneously with the supply of hot water by the hot water filling means, A cogeneration system comprising: a third heating control means for stopping the operation permission signal after heating the amount of hot water that is smaller of the available hot water volume or the additional hot water storage volume.