JP3815359B2

JP3815359B2 - Hot water storage hot water floor heating system

Info

Publication number: JP3815359B2
Application number: JP2002101852A
Authority: JP
Inventors: 雅司浦野; 眞西川; 享川上; 聡中島
Original assignee: Matsushita Electric Works Ltd
Current assignee: Panasonic Electric Works Co Ltd
Priority date: 2002-04-03
Filing date: 2002-04-03
Publication date: 2006-08-30
Anticipated expiration: 2022-04-03
Also published as: JP2003294251A

Description

【０００１】
【発明の属する技術分野】
本発明は、出湯と床暖房の両方を行なうことが可能な貯湯式給湯床暖房システムに関するものである。
【０００２】
【従来の技術】
従来、加熱部にて加熱した湯を貯溜する貯湯タンクに、出湯端末に湯を供給する給湯配管を貯湯タンクの上端部に接続し、一方、上記貯湯タンク内に床暖房用循環パイプの熱交換部を配置して、貯湯タンク内の高温の湯と床暖房用循環パイプ内を循環する熱媒との間で熱交換を行なうようにした貯湯式給湯床暖房システムが知られている。
【０００３】
【発明が解決しようとする課題】
ところで、貯湯タンク内の湯の温度は上層部で最も高く、中層部ではそれよりも低くなり、下層部では最も低くなっているが、従来では、貯湯タンクの湯を貯湯タンクの上層領域から取り出して給水管からの低温水と混合して所定温度にして出湯端末へ供給するようにしているため、出湯と床暖房とを同時に行なう場合にあっては、出湯によって上層部の高温の湯が使用されてしまい、この高温の湯を床暖房のために利用できなくなるため、従来では貯湯タンク内の湯水を加熱部によって加熱する必要が生じる。しかも、貯湯タンクの上層部から出湯がされると、貯湯タンクの下端部からその使用分だけ市水（低温水）が供給されるため、貯湯タンクの上層部の湯の温度が低くなり、貯湯タンク内部にはまだ給湯に利用できる温度の湯が残っているにもかかわらず、加熱部によって上層部を床暖房が可能な温度（例えば、９０℃前後）まで加熱する必要が生じ、このため主貯湯タンク内部のほぼ全量の湯（熱）を有効に利用できないという欠点がある。
【０００４】
そのうえ、従来では貯湯タンク内部に給湯に利用できる温度の湯が残った状態であるにもかかわらず加熱を行なうために、例えばヒートポンプ式の加熱方式を採用できないという問題がある。つまり、ヒートポンプはその入口水温が低いほどＣＯＰ｛冷媒が凝縮する際に放出する熱量／圧縮機動力｝が高くなるという特性を有するが、従来のように床暖房用循環パイプの往路側の加熱温度よりも低いが、給湯に利用できる温度以上の湯（例えば６０℃前後）を加熱する場合は、ヒートポンプの入口水温が高くなるためにＣＯＰが低下して、加熱効率がきわめて悪くなり、この結果従来ではヒートポンプによる加熱方式は採用できないものであった。
【０００５】
本発明は、上記の従来例の問題点に鑑みて発明したものであって、その目的とするところは、貯湯タンク内のほぼ全量の湯（熱）をすべて床暖房又は給湯に有効に使いきることができると共に、ヒートポンプによる効率の良い加熱方式を実現できる貯湯式給湯床暖房システムを提供することにある。
【０００６】
【課題を解決するための手段】
上記課題を解決するために本発明にあっては、加熱部１にて加熱した湯を貯溜する貯湯タンク２を備えると共に、床暖房を行なうための熱媒を循環させる床暖房用循環パイプ５の熱交換部７を貯湯タンク２内の上部の床暖房用の高温の湯が貯湯される高温湯領域Ｓ１にし、貯湯タンク２の下端部に給水管８からの水を取り入れる水取り入れ口９を設け、貯湯タンク２の一側壁２ａに床暖房用循環パイプ５の復路５ｂ側に戻される熱媒の温度近くの温度の湯を取り出すための湯取り出し口１０を設け、先端部が出湯端末３に接続される給湯配管４を湯取り出し口１０に接続すると共に、給湯配管４の湯取り出し口１０と出湯端末３との途中に湯水混合弁１２を介して給水管８を接続し、上記熱交換部７の下方に、貯湯タンク２内の他側壁２ｂに面して下り傾斜して低温の下降水流Ｗが高温の湯と混ざらないようにしながら下降させる熱遮蔽板２０を配置したことを特徴としており、このように構成することで、貯湯タンク２の湯取り出し口１０からは床暖房用循環パイプ５の復路５ｂ側に戻される熱媒の温度近くの温度の湯が取り出されることとなる。これにより出湯時には貯湯タンク２内の高温湯領域Ｓ１の湯を使用しなくても済むようになり、その高温の湯をそのまま床暖房の熱源として利用できるようになる。しかも、熱交換部７から下降してくる湯が貯湯タンク２内の高温の湯を押し上げることで、床暖房用循環パイプ５の往路５ａ側を加熱するための高温の湯を床暖房の熱交換にすべて有効に利用できるようになる。従って、従来のように貯湯タンク２内の湯水を加熱部１によって無駄に加熱する必要がなくなる。さらに、給湯配管４の湯と給水管８からの水とを混合して出湯することで、設定された端末出湯温度の湯を継続して供給可能となり、貯湯タンク２内部のほぼ全量の湯（熱）をすべて床暖房又は給湯に有効に使いきることができる。
また上記のように熱交換部７の下方に熱遮蔽板２０が設けられ、この熱遮蔽板２０は貯湯タンク２内の他側壁２ｂに面して下り傾斜しており、これにより、熱交換部７にて生じる低温の下降水流Ｗが高温の湯と混ざらないようにしながら下降させる働きをする。従って、熱交換されて低温となった湯は下降水流Ｗとなって熱交換部７の下方に配した熱遮蔽板２０に沿って高温の湯と混ざることなく、下層部まで下降していくので、中層部及び上層部の高温湯領域Ｓ１の湯の温度が下がることがないため、床暖房に支障をきたすことがない。
【０００７】
また上記湯取り出し口１０を貯湯タンク２の一側壁２ａの上下方向に間隔をあけて複数設け、各湯取り出し口１０には各湯取り出し口１０を個別に開閉する複数の出湯バルブＶと、湯取り出し口１０ごとに湯の温度を検知する複数の検知手段１３とをそれぞれ設け、湯の温度を検知手段１３にて検知して任意の設定温度に該当する出湯バルブＶを開閉制御する制御部１４を設けるのが好ましく、この場合、出湯によって貯湯タンク２内の湯量が減り、貯湯タンク２の下端部の水取り入れ口９から水が供給されて、貯湯タンク２の下層部の低温湯領域（水道水の温度）Ｓ３が増加して、出湯を行なっている湯取り出し口１０の温度が所定温度以下となったときにはその湯取り出し口１０を閉じ、検知手段１３によって温度が所定温度以上である別の湯取り出し口１０を検知して開放することで、高温の湯（９０℃前後）を残しつつ、設定された端末出湯温度の湯を当該別の湯取り出し口１０から出湯端末３に継続して供給可能となる。
【０００８】
また上記貯湯タンク２の上端部に、貯湯タンク２内の湯を取り出すための副湯取り出し口３２を設け、副湯取り出し口３２に副給湯配管３０の一端を接続し、副給湯配管３０の他端を混合弁１１を介して上記給湯配管４の湯水混合弁１２と湯取り出し口１０との途中に接続するのが好ましく、この場合、例えば出湯量が増えて湯取り出し口１０から取り出される湯の温度が所定温度以下となったとき、或いは端末出湯温度が貯湯タンク２内の中間温湯領域（高温湯領域Ｓ１の温度よりも低く、且つ設定された端末出湯温度よりも高い温度の領域）Ｓ２の温度よりも高く設定されたときは、混合弁１１を副給湯配管３０が全開、給湯配管４が全閉となるように切り替えることにより、貯湯タンク２の上端部の副湯取り出し口３２から高温の湯を出湯させて、端末出湯温度に見合った湯を出湯端末３に供給することが可能となる。
【０００９】
また上記貯湯タンク２の上端部に流路入口１５、下端部に流路出口１６を設け、これら流路入口１５と流路出口１６とをタンク外部に配した循環流路１７を介して接続すると共に、循環流路１７の途中に加熱部１を設けるのが好ましく、この場合、加熱部１によって貯湯タンク２内の上層部→中層部→下層部の順に高温の湯が効率良く溜められる。
【００１０】
また上記加熱部１は、ヒートポンプ１８と、ヒートポンプ１８の熱媒と循環流路１７内に循環する湯水との間で熱交換する熱交換器１９とで構成されているのが好ましく、この場合、貯湯タンク２内部のほぼ全量の湯（熱）をすべて使いきることができるので、加熱の際には貯湯タンク２内のほぼ全体に水が溜まった状態で加熱をすることとなるため、入口水温が低いほどＣＯＰが高くなるというヒートポンプの特性を生かした加熱方式を実現できる。
【００１１】
【発明の実施の形態】
以下、本発明を添付図面に示す実施形態に基づいて説明する。
【００１２】
図１は、加熱部１にて加熱した湯を貯溜する貯湯タンク２に、出湯端末３に湯を供給する給湯配管４を接続すると共に、貯湯タンク２内に床暖房用循環パイプ５の熱交換部７を配置して、貯湯タンク２内の高温の湯と床暖房用循環パイプ５内を循環する熱媒との間で熱交換を行なう貯湯式給湯床暖房システムの一例を示している。
【００１３】
上記熱交換部７は貯湯タンク２内の上層部の高温湯領域Ｓ１に配置され、床暖房パネル６内に引き込まれる床暖房用循環パイプ５の往路５ａ側に供給される熱媒と高温湯領域Ｓ１の湯との間で熱交換を行なうためのものである。熱交換部７の下方には、熱遮蔽板２０が設けられている。この熱遮蔽板２０は貯湯タンク２内の他側壁２ｂに面して下り傾斜しており、これにより、熱交換部７にて生じる低温の下降水流Ｗが高温の湯と混ざらないようにしながら下降させる働きをする。
【００１４】
貯湯タンク２の下端部には水取り入れ口９が設けられ、給水管８が接続配管を介して水取り入れ口９に接続されている。接続配管の途中には減圧弁２５、ストレーナー（ごみ取り）２６とが介設されている。なお給水管８からは直圧２００ｋＰａ以上の市水が供給される。
【００１５】
貯湯タンク２の一側壁２ａには、床暖房用循環パイプ５の復路５ｂ側に戻される熱媒の温度近くの温度の湯を取り出すための湯取り出し口１０が設けられている。本例では、湯取り出し口１０は貯湯タンク２の一側壁２ａの上下方向に間隔をあけて複数設けられている。各湯取り出し口１０は、それぞれ、出湯バルブＶを介して１本の給湯配管４に接続されている。給湯配管４の先端部は逆止弁２７を介して出湯端末３に接続されている。また給湯配管４の湯取り出し口１０と出湯端末３との途中には、湯水混合弁１２を介して給水管８が接続されている。図１の例では、湯水混合弁１２の開度を矢印で示している。この湯水混合弁１２は、予め設定される又はリモコン等によって逐次設定される端末出湯温度に応じて、給湯配管４を全開、給水管８を全閉とする方向（図１の矢印ｎ１の方向）と、給湯配管４を全閉、給水管８を全開とする方向（図１の矢印ｎ２の方向）との間で開度が切り替え可能となっている。
【００１６】
また、上記貯湯タンク２の複数の湯取り出し口１０には、各湯取り出し口１０を個別に開閉する複数の出湯バルブＶと、湯取り出し口１０ごとに湯の温度を検知する複数の検知手段１３とがそれぞれ設けられている。本例では検知手段１３は、貯湯タンク２の一側壁２ａに沿って設けられた上下複数のサーミスタ等の温度センサＴ（Ｔ１，Ｔ２，…，Ｔｎ）からなり、貯湯タンク２全体の温度分布を把握できるようになっている。ここでは１つの温度センサＴと１つの出湯バルブＶを１組として、貯湯タンク２内の湯取り出し口１０の近くにそれぞれ配置されている。そして、設定された任意の温度に応じた最適な出湯バルブＶを１つ（或いは複数）を選び、この出湯バルブＶがマイコン等によって構成される制御部１４（図９）からの制御信号により開放されることにより、最適な出湯バルブＶから出湯端末３に給湯されるようになっている。
【００１７】
また、上記貯湯タンク２の上端部には、貯湯タンク２内の高温の湯を取り出すための副湯取り出し口３２が設けられており、この副湯取り出し口３２に副給湯配管３０の一端が接続され、副給湯配管３０の他端が混合弁１１を介して上記給湯配管４の湯水混合弁１２と湯取り出し口１０との途中に接続されている。図１の例では、混合弁１１の開度を矢印で示している。この混合弁１１は、設定された端末設定温度に応じて、副給湯配管３０を全開、給湯配管４を全閉とする方向（図１の矢印ｍ１の方向）と、副給湯配管３０を全閉、給湯配管４を全開とする方向（図１の矢印ｍ２の方向）との間で開度が切り替え可能となっている。
【００１８】
さらに、貯湯タンク２の上端部に流路入口１５が設けられ、貯湯タンク２の下端部には流路出口１６が設けられ、これら流路入口１５と流路出口１６とはタンク外部に配した循環流路１７を介して互いに接続されていると共に、この循環流路１７の途中に加熱部１が設けられている。ここでは、加熱部１は、ヒートポンプ１８と、ヒートポンプ１８の熱媒と循環流路１７内に循環する湯水との間で熱交換する熱交換器１９とで構成されている。
【００１９】
上記貯湯タンク２内の温度分布の一例を説明すると、貯湯タンク２の高温湯領域Ｓ１の温度をＡ、中間温湯領域Ｓ２の温度をＢ、低温湯領域Ｓ３の温度をＣとしたとき、貯湯タンク２からの放熱ロスが少ない場合は、Ａ＞Ｂ＞Ｃの関係となる。以下において、Ａは床暖房用循環パイプ５の往路５ａ側の温度であり、例えば９０℃前後とする。Ｂは湯取り出し口１０から取り出されるタンク出湯温度であり、例えば５７℃前後とする。Ｃは水道水の温度であり、例えば１０℃前後とする。なお、タンク出湯温度Ｂは、床暖房用循環パイプ５の復路５ｂ側の温度δ近くの温度（例えば９０℃よりも低く、且つ設定された端末出湯温度よりも高い温度、例えば５７℃前後）とする。以下において、風呂、台所、シャワー等の給湯装置側（出湯端末３）で使用される湯の温度（端末出湯温度）を例えば、３８℃〜４５℃とする。なお端末出湯温度の設定は予め設定される場合或いはリモコンによって逐次設定される場合のいずれであってもよい。
【００２０】
次に、本貯湯式給湯床暖房システムの動作を図２に示す床暖房と給湯の使用パターンを例に挙げて説明する。図２中の早朝の使用パターンａは床暖房のみ、使用パターンｂはシャンプー等の給湯と床暖房の両方、夕方以後の使用パターンｃは床暖房のみ、使用パターンｄは風呂炊きと給湯と床暖房のすべて、蓄熱パターンｅは床暖房も出湯も行なわない場合である。
【００２１】
先ず、早朝では貯湯タンク２内の湯の温度はすべて９０℃以上の高温湯領域Ｓ１となっている。つまり、早朝使用前は後述のように示すように、深夜電力を利用して貯湯タンク２内の全量を高温湯領域Ｓ１となるようにあらかじめ加熱しておく。上記床暖房のみの使用パターンａでは、図３に示すように、給湯配管４から出湯されないように全ての出湯バルブＶ（Ｖ１，Ｖ２，……，Ｖｎ）を閉じ、床暖房のポンプ５１のみを稼動する。これにより、床暖房用循環パイプ５内の熱媒が循環して、往路５ａ側に供給される熱媒が熱交換部７において貯湯タンク２内の高温の湯（９０℃前後）との間で熱交換されて床暖房パネル６内へ供給される。そして、床暖房パネル６を加熱した後の低温となった熱媒（温度δ：例えば５７℃前後）は床暖房用循環パイプ５の復路５ｂに戻って熱交換部７において再び高温の湯（９０℃前後）と熱交換される。このとき図４に示すように、熱交換されて低温となった湯（５７℃前後）は下降水流Ｗとなって熱交換部７の下方に配した熱遮蔽板２０に沿って高温の湯と混ざることなく、下層部まで下降していき、下層部は中間温湯領域Ｓ２（５７℃前後）となる。従って、中層部及び上層部の高温湯領域Ｓ１の湯（９０℃前後）の温度が下がることがないため、床暖房に支障をきたすことがない。
【００２２】
その後、給湯と床暖房の両方を行なう使用パターンｂ、さらに夕方において風呂炊きと出湯と床暖房とを行なう使用パターンｃに移行する場合を説明する。このとき、貯湯タンク２内の湯の温度分布は、例えば上層部が９０℃の高温湯領域Ｓ１、中層部が５７℃前後の温度を含む中間温湯領域Ｓ２となっているものとする。この場合、設定されたタンク出湯温度（例えば、５７℃前後）に合わせて、上下複数に設けた温度センサＴ（Ｔ１，Ｔ２，…，Ｔｎ）が中間温湯領域Ｓ２の湯の温度（例えば、５７℃前後）を検知し、この温度に該当する湯取り出し口１０の出湯バルブＶを開放する。このとき、５７℃前後の湯取り出し口１０が複数検知されたときは、中間温湯領域Ｓ２のうちの最も下に位置する湯取り出し口１０の出湯バルブＶ５のみ（或いは中間温湯領域Ｓ２の出湯バルブＶ５、Ｖ６の両方でもよい）を開放する。また、給湯配管４の混合弁１１を副給湯配管３０が全閉、給湯配管４が全開となるように図５の矢印ｍ２方向に切り替えると共に、湯水混合弁１２の開度を調整して、設定された端末出湯温度（例えば４２℃）となるように給湯配管４内の湯（５７℃前後）と給水管８からの水とを混合して出湯端末３に供給する。このとき、出湯に使用した分だけ貯湯タンク２の下端部の水取り入れ口９から市水が供給される。これにより図５のように、下層部が１０℃程度の低温湯領域Ｓ３となる。
【００２３】
その後、貯湯タンク２内の上層部には９０℃の高温湯領域Ｓ１があり、さらにその下には５７℃前後の湯を含む中間温湯領域Ｓ２が残っており、中層部及び下層部は１０℃の低温湯領域Ｓ３となっている場合において、上記出湯が終了して床暖房のみとなる使用パターンｄでは、図６に示すように、給湯配管４から出湯されないように全ての出湯バルブＶを閉じ、床暖房のポンプ５１のみを稼動する。このときは、上層部に残っている高温の湯（９０℃前後）をすべて残らず床暖房に利用することができる。
【００２４】
一方、出湯時において、出湯量が増えて中間温湯領域Ｓ２の湯（５７℃前後）が熱交換部７のある上層部まで達したときは、最上部の出湯バルブＶ１のみを開いて上層部の湯を出湯用として利用することができる。
【００２５】
しかして、貯湯タンク２の側壁の任意の位置から中間温湯領域Ｓ２における５７℃前後の湯を取り出して使用するので、貯湯タンク２の高温湯領域Ｓ１の湯は取り出されないため、床暖房に支障をきたさないようにしながら、出湯することができる。しかも、前述のように床暖房によって上層部の熱交換部７で生じた５７℃前後の下降水流Ｗが中間温湯領域Ｓ２まで下降してくる。ここで給湯に利用される湯の温度は、下降してくる湯の温度とほぼ同レベル（例えば５７℃前後）であるため、その下降水流Ｗをそのまま給湯に利用できるようになり、またこのとき、下降水流Ｗが高温の湯を押し上げるので、貯湯タンク２の上層部は高温湯領域Ｓ１に保たれ、床暖房の熱交換にすべて有効に利用できるようになる。従って、従来のように貯湯タンク２内の湯水を加熱部１によって無駄に加熱する必要がなくなる。
【００２６】
なお、出湯時において設定された端末出湯温度が中間温湯領域Ｓ２の温度（５７℃前後）以上の場合、例えば６０℃とされたときには、高温湯領域Ｓ１の出湯バルブＶを開くか、或いは混合弁１１を副給湯配管３０が全開、給湯配管４が全閉となるように図６の矢印ｍ１方向に切り替えることにより、貯湯タンク２の上端部の副湯取り出し口３２から高温の湯を出湯させて出湯端末３に供給することが可能となる。
【００２７】
また、出湯によって貯湯タンク２内の湯量が減り、貯湯タンク２の下端部から水が新たに供給されるが、この下層部の水量が増加するにつれて、中間温湯領域Ｓ２の下層部分が徐々に上に移動するのに伴い、湯取り出し口１０のタンク出湯温度が低下してくるが、温度センサＴによって５７℃前後の湯取り出し口１０を検知することで、所定温度以下になった湯取り出し口１０の出湯バルブＶを閉じ、５７℃前後の湯取り出し口１０を検知してその出湯バルブＶを開放する。このような出湯バルブＶの切り替えは中間温湯領域Ｓ２が熱交換部７のある上層部に達するまで繰り返される。これにより、中間温湯領域Ｓ２の湯を継続して供給可能となる。
【００２８】
この結果、本貯湯式給湯床暖房システムでは、設定された端末出湯温度に見合った湯を出湯端末３に供給可能としたものでありながら、貯湯タンク２内の高温の湯をすべて床暖房用として、或いは給湯として有効に利用できることとなり、エネルギー効率がきわめて良くなり、従来と比較して電気代を節約できるものである。
【００２９】
また、貯湯タンク２内の温度センサＴによって貯湯タンク２内の水温が一定温度以下となったことを検知したときは、制御部１４は、貯湯タンク２内の湯を殆んど使いきったと判断して、図２の蓄熱パターンｅを実行する。このとき図７に示すように、加熱部１のポンプ５０を稼動して、貯湯タンク２の循環流路１７に循環する湯水とヒートポンプ１８の熱媒との間で熱交換することにより、貯湯タンク２内の湯水が加熱される。本例では全ての出湯バルブＶを閉じて、開閉弁４６を開いて加熱部１のポンプ５０を稼動することで、貯湯タンク２内に高温の湯を溜めることができる。
【００３０】
また本例では、加熱部１としてヒートポンプ方式を利用している。このヒートポンプ１８の特性を図８に示す。図８はヒートポンプ１８の入口水温と加熱時のＣＯＰとの関係を示している。なお、ＣＯＰは、｛冷媒が凝縮する際に放出する熱量／圧縮機動力｝である。図８では、ヒートポンプ１８の入口水温が低いほど、ＣＯＰが高くなっている。ヒートポンプ１８の入口水温が例えば３０℃以下では、ＣＯＰが１．５０以上と良くなる。しかして、本発明では主貯湯タンク２内部のほぼ全量の湯（熱）をすべて使いきることができるので、加熱の際には貯湯タンク２内のほぼ全体に水が溜まった状態で加熱をするため、ヒートポンプ１８の熱媒と低温の水との熱交換となり、ヒートポンプ１８の入口水温が低いほどＣＯＰが高くなるという特性を利用して効率良く加熱することができる。なお、このヒートポンプ１８による加熱は、昼夜を問わず、貯湯タンク２内の湯を使いきった段階で実行されるものである。
【００３１】
【発明の効果】
上述のように請求項１記載の発明にあっては、加熱部にて加熱した湯を貯溜する貯湯タンクを備えると共に、床暖房を行なうための熱媒を循環させる床暖房用循環パイプの熱交換部を貯湯タンク内の上部の床暖房用の高温の湯が貯湯される高温湯領域に配置し、貯湯タンクの下端部に給水管からの水を取り入れる水取り入れ口を設け、貯湯タンクの一側壁に床暖房用循環パイプの復路側に戻される熱媒の温度近くの温度の湯を取り出すための湯取り出し口を設け、先端部が出湯端末に接続される給湯配管を湯取り出し口に接続すると共に、給湯配管の湯取り出し口と出湯端末との途中に湯水混合弁を介して給水管を接続したので、貯湯タンクの湯取り出し口からは床暖房用循環パイプの復路側に戻される熱媒の温度近くの温度の湯が取り出されることとなる。これにより出湯時には貯湯タンク内の高温湯領域の湯を使用しなくても済むようになり、その高温の湯をそのまま床暖房の熱源として利用できるようになる。しかも、熱交換部から下降してくる湯が貯湯タンク内の高温の湯を押し上げることで、床暖房用循環パイプの往路側を加熱するための高温の湯を床暖房の熱交換にすべて有効に利用できるようになる。従って、従来のように貯湯タンク内の湯水を加熱部によって無駄に加熱する必要がなくなる。さらに、給湯配管の湯と給水管からの水とを混合して出湯することで、設定された端末出湯温度の湯を継続して出湯端末に供給可能となる。従って、本貯湯式給湯床暖房システムでは、設定された端末出湯温度に見合った湯を出湯端末に供給可能としたものでありながら、貯湯タンク内の高温の湯をすべて床暖房用として、或いは給湯用として有効に利用できることとなり、エネルギー効率がきわめて良くなり、従来と比較して電気代を節約できるものである。さらに、上記熱交換部の下方に、貯湯タンク内の他側壁に面して下り傾斜して低温の下降水流が高温の湯と混ざらないようにしながら下降させる熱遮蔽板を配置した。この熱遮蔽板は貯湯タンク内の他側壁に面して下り傾斜しており、これにより、熱交換部にて生じる低温の下降水流が高温の湯と混ざらないようにしながら下降させる働きをする。従って、熱交換されて低温となった湯は下降水流となって熱交換部の下方に配した熱遮蔽板に沿って高温の湯と混ざることなく、下層部まで下降していくので、中層部及び上層部の高温湯領域の湯の温度が下がることがないため、床暖房に支障をきたすことがない。
【００３２】
また請求項２記載の発明は、請求項１記載の効果に加えて、湯取り出し口を貯湯タンクの一側壁の上下方向に間隔をあけて複数設け、各湯取り出し口には各湯取り出し口を個別に開閉する複数の出湯バルブと、湯取り出し口ごとにタンク出湯温度を検知する複数の検知手段とをそれぞれ設け、湯の温度を検知手段にて検知して任意の設定温度に該当する出湯バルブを開閉制御する制御部を設けたので、出湯によって貯湯タンク内の湯量が減り、貯湯タンクの下端部の水取り入れ口から水が供給されて、貯湯タンクの下層部の低温湯領域が増加して、出湯を行なっている湯取り出し口の温度が低下してきたときその湯取り出し口を閉じ、検知手段によって出湯温度よりも高く且つ熱交換部の往路側における温度よりも低い温度にある湯取り出し口を検知して開放することで、高温の湯を残しつつ、出湯端末から要求された端末出湯温度の湯を継続して供給可能となる。
【００３３】
また請求項３記載の発明は、請求項１記載の効果に加えて、貯湯タンクの上端部に、貯湯タンク内の湯を取り出すための副湯取り出し口を設け、副湯取り出し口に副給湯配管の一端を接続し、副給湯配管の他端を混合弁を介して上記給湯配管の湯水混合弁と湯取り出し口との途中に接続したので、例えば出湯量が増えて湯取り出し口から取り出される湯の温度が所定温度以下となったとき、或いは端末出湯温度が貯湯タンク内の中間温湯領域（高温湯領域の温度よりも低く、且つ床暖房用循環パイプの復路側に戻される熱媒の温度近くの温度の湯が溜められている領域）の温度よりも高く設定されたときは、混合弁を副給湯配管が全開、給湯配管が全閉となるように切り替えることにより、貯湯タンクの上端部の副湯取り出し口から高温の湯を出湯させて、端末出湯温度に見合った湯を出湯端末に供給することが可能となる。
【００３４】
また請求項４記載の発明は、請求項１乃至請求項３のいずれかに記載の効果に加えて、貯湯タンクの上端部に流路入口、下端部に流路出口を設け、これら流路入口と流路出口とをタンク外部に配した循環流路を介して接続すると共に、循環流路の途中に加熱部を設けたので、加熱部によって貯湯タンク内の上層部→中層部→下層部の順に高温の湯を効率良く溜めることができる。
【００３５】
また請求項５記載の発明は、請求項１又は請求項４記載の効果に加えて、上記加熱部は、ヒートポンプと、ヒートポンプの熱媒と循環流路内に循環する湯水との間で熱交換する熱交換器とで構成されているので、貯湯タンク内部のほぼ全量の熱（熱）をすべて有効に使いきることができるので、加熱の際には貯湯タンク内のほぼ全体に水が溜まった状態で加熱をするため、入口水温が低いほどＣＯＰが高くなるというヒートポンプの特性を生かした加熱方式を実現できる。
【図面の簡単な説明】
【図１】本発明の実施形態の一例を示す概略構成図である。
【図２】同上の床暖房、給湯の使用パターンの説明図である。
【図３】同上の床暖房のみの使用状態の概略構成図である。
【図４】同上の下降水流の説明図である。
【図５】同上の出湯と床暖房の両方の使用状態の概略構成図である。
【図６】同上の出湯後において床暖房のみの使用状態の概略構成図である。
【図７】同上の加熱部により加熱を行なう場合の説明図である。
【図８】同上のヒートポンプの入口水温とＣＯＰとの関係を示すグラフである。
【図９】同上の制御部のブロック図である。
【符号の説明】
１加熱部
２貯湯タンク
２ａ一側壁
２ｂ他側壁
３出湯端末
４給湯配管
５床暖房用循環パイプ
５ａ往路
５ｂ復路
７熱交換部
８給水管
９水取り入れ口
１０湯取り出し口
１１混合弁
１２湯水混合弁
１３検知手段
１４制御部
１５流路入口
１６流路出口
１７循環流路
１８ヒートポンプ
１９熱交換器
３０副給湯配管
３２副湯取り出し口
Ｓ１高温湯領域
Ｓ２中間温湯領域
Ｓ３低温湯領域
Ｖ出湯バルブ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hot water storage hot water floor heating system capable of performing both hot water and floor heating.
[0002]
[Prior art]
Conventionally, a hot water storage tank that stores hot water heated by a heating unit is connected to a hot water supply pipe that supplies hot water to a hot water outlet terminal at the upper end of the hot water storage tank, while heat exchange of a circulation pipe for floor heating is performed in the hot water storage tank. There is known a hot water storage type hot water floor heating system in which a section is arranged to exchange heat between hot water in a hot water storage tank and a heat medium circulating in a floor heating circulation pipe.
[0003]
[Problems to be solved by the invention]
By the way, the temperature of hot water in the hot water storage tank is highest in the upper layer, lower in the middle layer, and lowest in the lower layer, but conventionally, the hot water in the hot water tank is taken out from the upper layer area of the hot water tank. The hot water in the upper layer is used by the hot water when the hot water and floor heating are performed at the same time. Therefore, since this hot water cannot be used for floor heating, conventionally, it is necessary to heat the hot water in the hot water storage tank by the heating unit. In addition, when hot water is discharged from the upper layer of the hot water storage tank, city water (low temperature water) is supplied from the lower end of the hot water storage tank, so the temperature of the hot water in the upper layer of the hot water storage tank is lowered. Although there is still hot water in the tank at a temperature that can be used for hot water supply, it is necessary to heat the upper layer to a temperature at which floor heating is possible (for example, around 90 ° C.). There is a drawback that almost the entire amount of hot water (heat) inside the hot water storage tank cannot be used effectively.
[0004]
In addition, conventionally, there is a problem that, for example, a heat pump type heating method cannot be employed in order to perform heating even though hot water having a temperature that can be used for hot water supply remains in the hot water storage tank. In other words, the heat pump has a characteristic that the lower the inlet water temperature, the higher the COP {amount of heat released when the refrigerant condenses / compressor power}, but the heating temperature on the forward side of the floor heating circulation pipe as in the prior art. However, when heating hot water (for example, around 60 ° C.) that is higher than the temperature that can be used for hot water supply, the water temperature at the inlet of the heat pump becomes high, so the COP is lowered and the heating efficiency becomes extremely low. However, the heating method using a heat pump could not be adopted.
[0005]
The present invention has been invented in view of the problems of the above-described conventional example, and the object of the present invention is to use all the hot water (heat) in the hot water storage tank effectively for floor heating or hot water supply. Another object of the present invention is to provide a hot water storage hot water floor heating system capable of realizing an efficient heating method using a heat pump.
[0006]
[Means for Solving the Problems]
  In order to solve the above problems, the present invention includes a hot water storage tank 2 for storing hot water heated by the heating unit 1.,floorThe heat exchanger 7 of the floor heating circulation pipe 5 that circulates a heat medium for heating is set to a high temperature hot water region S1 in which hot water for floor heating in the hot water storage tank 2 is stored. A water intake 9 for taking in water from the water supply pipe 8 is provided at the lower end, and the hot water storage tank 2One side wall 2aIs provided with a hot water outlet 10 for taking out hot water having a temperature close to the temperature of the heating medium returned to the return path 5b side of the floor heating circulation pipe 5, and the hot water supply pipe 4 whose tip is connected to the hot water outlet terminal 3 is taken out. In addition to being connected to the port 10, a water supply pipe 8 is connected to the hot water outlet 4 of the hot water supply pipe 4 and the hot water outlet terminal 3 via a hot water mixing valve 12.Below the heat exchanging section 7, a heat shielding plate 20 is disposed so as to face the other side wall 2b in the hot water storage tank 2 and to descend while keeping the low temperature precipitation stream W from mixing with hot water.With this configuration, hot water having a temperature close to the temperature of the heating medium returned to the return path 5b side of the floor heating circulation pipe 5 is taken out from the hot water outlet 10 of the hot water storage tank 2. It will be. As a result, the hot water in the hot water storage area S1 in the hot water storage tank 2 does not have to be used when the hot water is discharged, and the hot water can be used as it is as a heat source for floor heating. In addition, the hot water descending from the heat exchanging unit 7 pushes up the hot water in the hot water storage tank 2, so that the hot water for heating the forward path 5 a side of the floor heating circulation pipe 5 is exchanged for floor heating. All will be available effectively. Therefore, there is no need to wastefully heat the hot water in the hot water storage tank 2 by the heating unit 1 as in the prior art. Furthermore, by mixing the hot water in the hot water supply pipe 4 and the water from the water supply pipe 8 and discharging the hot water, the hot water at the set terminal hot water temperature can be continuously supplied, and almost all of the hot water inside the hot water storage tank 2 ( (Heat) can be used up effectively for floor heating or hot water supply.
Further, as described above, the heat shielding plate 20 is provided below the heat exchanging portion 7, and the heat shielding plate 20 is inclined downward facing the other side wall 2 b in the hot water storage tank 2. It works to descend while keeping the low temperature precipitation stream W generated in 7 from mixing with hot water. Accordingly, the hot water that has undergone heat exchange and has become a low temperature becomes a descending water flow W and descends to the lower layer portion without being mixed with the high temperature hot water along the heat shielding plate 20 disposed below the heat exchange portion 7. In addition, since the temperature of the hot water in the high-temperature hot water region S1 in the middle layer and the upper layer does not decrease, the floor heating is not hindered.
[0007]
  The hot water outlet 10 is connected to the hot water storage tank 2.oneA plurality of hot water outlets 10 are provided at intervals in the vertical direction of the side wall 2 a, and a plurality of hot water outlet valves V for individually opening and closing each hot water outlet 10 and a plurality of hot water outlets 10 for detecting the temperature of hot water. It is preferable to provide a control unit 14 that opens and closes the hot water valve V corresponding to an arbitrary set temperature by detecting the temperature of the hot water by the detecting means 13. The amount of hot water in the tank 2 is reduced, water is supplied from the water intake 9 at the lower end of the hot water storage tank 2, and the low temperature hot water region (tap water temperature) S3 in the lower layer of the hot water storage tank 2 is increased. When the temperature of the hot water outlet 10 that is being used becomes equal to or lower than the predetermined temperature, the hot water outlet 10 is closed, and another hot water outlet 10 whose temperature is equal to or higher than the predetermined temperature is detected and opened by the detecting means 13. , While leaving the high-temperature water (90 ° C. so), can be supplied continuously to the hot water of the set terminal tapping temperature in tapping terminal 3 from the different hot water outlet 10.
[0008]
Further, an auxiliary hot water outlet 32 for taking out hot water in the hot water storage tank 2 is provided at the upper end of the hot water tank 2, and one end of the auxiliary hot water supply pipe 30 is connected to the auxiliary hot water outlet 32. It is preferable to connect the end to the middle of the hot water mixing valve 12 and the hot water outlet 10 of the hot water supply pipe 4 via the mixing valve 11. In this case, for example, the amount of hot water discharged increases the amount of hot water taken out from the hot water outlet 10. When the temperature falls below a predetermined temperature or when the terminal hot water temperature is in an intermediate hot water region (a region having a temperature lower than the temperature of the hot hot water region S1 and higher than the set terminal hot water temperature) in the hot water storage tank 2 When the temperature is set higher than the temperature, by switching the mixing valve 11 so that the auxiliary hot water supply pipe 30 is fully opened and the hot water supply pipe 4 is fully closed, the hot water is removed from the auxiliary hot water outlet 32 at the upper end of the hot water storage tank 2. Hot water By hot water, it is possible to supply hot water commensurate with the terminal tapping temperature in tapping terminal 3.
[0009]
The hot water storage tank 2 is provided with a flow path inlet 15 at the upper end and a flow path outlet 16 at the lower end, and the flow path inlet 15 and the flow path outlet 16 are connected via a circulation flow path 17 arranged outside the tank. At the same time, it is preferable to provide the heating unit 1 in the middle of the circulation flow path 17. In this case, the heating unit 1 efficiently stores hot water in the order of the upper layer portion → the middle layer portion → the lower layer portion in the hot water storage tank 2.
[0010]
The heating unit 1 is preferably composed of a heat pump 18 and a heat exchanger 19 that exchanges heat between the heat medium of the heat pump 18 and hot water circulating in the circulation flow path 17. In this case, Since almost all the amount of hot water (heat) in the hot water storage tank 2 can be used up, heating is performed with almost all of the hot water in the hot water storage tank 2 being heated. It is possible to realize a heating method that takes advantage of the characteristics of the heat pump that COP increases as the value of COP decreases.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described based on embodiments shown in the accompanying drawings.
[0012]
FIG. 1 shows a hot water storage tank 2 that stores hot water heated by a heating unit 1, and a hot water supply pipe 4 that supplies hot water to a hot water outlet terminal 3. An example of a hot water storage hot water floor heating system in which the section 7 is arranged to exchange heat between the hot water in the hot water storage tank 2 and the heating medium circulating in the floor heating circulation pipe 5 is shown.
[0013]
The heat exchanging unit 7 is disposed in the high temperature hot water region S1 in the upper layer portion of the hot water storage tank 2, and the heat medium and the high temperature hot water region supplied to the forward path 5a side of the floor heating circulation pipe 5 drawn into the floor heating panel 6. This is for exchanging heat with the hot water of S1. A heat shielding plate 20 is provided below the heat exchange unit 7. The heat shielding plate 20 is inclined downwardly facing the other side wall 2b in the hot water storage tank 2, and thus the low temperature precipitation stream W generated in the heat exchanging section 7 is lowered so as not to be mixed with hot water. To work.
[0014]
A water intake 9 is provided at the lower end of the hot water storage tank 2, and a water supply pipe 8 is connected to the water intake 9 through a connection pipe. A pressure reducing valve 25 and a strainer (garbage removal) 26 are provided in the middle of the connecting pipe. City water with a direct pressure of 200 kPa or more is supplied from the water supply pipe 8.
[0015]
On one side wall 2a of the hot water storage tank 2, there is provided a hot water outlet 10 for taking out hot water having a temperature close to the temperature of the heating medium returned to the return path 5b side of the floor heating circulation pipe 5. In this example, a plurality of hot water outlets 10 are provided at intervals in the vertical direction of the one side wall 2 a of the hot water storage tank 2. Each hot water outlet 10 is connected to one hot water supply pipe 4 via a hot water valve V, respectively. The tip of the hot water supply pipe 4 is connected to the hot water outlet terminal 3 via a check valve 27. A hot water supply pipe 8 is connected to the hot water outlet 4 of the hot water supply pipe 4 and the hot water outlet terminal 3 through a hot water mixing valve 12. In the example of FIG. 1, the opening degree of the hot and cold mixing valve 12 is indicated by an arrow. The hot water / water mixing valve 12 is set in a direction in which the hot water supply pipe 4 is fully opened and the water supply pipe 8 is fully closed in accordance with the terminal hot water temperature set in advance or sequentially set by a remote controller or the like (direction of arrow n1 in FIG. 1). The opening degree can be switched between the direction in which the hot water supply pipe 4 is fully closed and the water supply pipe 8 is fully opened (the direction of the arrow n2 in FIG. 1).
[0016]
Further, the plurality of hot water outlets 10 of the hot water storage tank 2 include a plurality of hot water discharge valves V that individually open and close each hot water outlet 10 and a plurality of detection means 13 that detect the temperature of hot water for each hot water outlet 10. And are provided respectively. In this example, the detection means 13 includes temperature sensors T (T1, T2,..., Tn) such as a plurality of upper and lower thermistors provided along one side wall 2a of the hot water tank 2, and the temperature distribution of the entire hot water tank 2 is determined. It is possible to grasp. Here, one temperature sensor T and one hot water discharge valve V are arranged as a set and are arranged near the hot water outlet 10 in the hot water storage tank 2. Then, one (or a plurality) of optimum hot water valve V corresponding to the set arbitrary temperature is selected, and this hot water valve V is opened by a control signal from the control unit 14 (FIG. 9) constituted by a microcomputer or the like. Thus, hot water is supplied from the optimal hot water valve V to the hot water terminal 3.
[0017]
A hot water outlet 32 for taking out hot water in the hot water tank 2 is provided at the upper end of the hot water tank 2, and one end of the auxiliary hot water supply pipe 30 is connected to the hot water outlet 32. The other end of the auxiliary hot water supply pipe 30 is connected to the hot water mixing valve 12 and the hot water outlet 10 of the hot water supply pipe 4 through the mixing valve 11. In the example of FIG. 1, the opening degree of the mixing valve 11 is indicated by an arrow. According to the set terminal set temperature, the mixing valve 11 fully opens the auxiliary hot water supply pipe 30 and fully closes the hot water supply pipe 4 (direction of arrow m1 in FIG. 1), and fully closes the auxiliary hot water supply pipe 30. The opening degree can be switched between the direction in which the hot water supply pipe 4 is fully opened (the direction of the arrow m2 in FIG. 1).
[0018]
Further, a flow path inlet 15 is provided at the upper end of the hot water storage tank 2, and a flow path outlet 16 is provided at the lower end of the hot water storage tank 2. The flow path inlet 15 and the flow path outlet 16 are arranged outside the tank. While being connected to each other via a circulation channel 17, the heating unit 1 is provided in the middle of the circulation channel 17. Here, the heating unit 1 includes a heat pump 18 and a heat exchanger 19 that exchanges heat between the heat medium of the heat pump 18 and hot water circulating in the circulation flow path 17.
[0019]
An example of the temperature distribution in the hot water storage tank 2 will be described. When the temperature of the high temperature hot water region S1 of the hot water storage tank 2 is A, the temperature of the intermediate hot water region S2 is B, and the temperature of the low temperature hot water region S3 is C, the hot water storage tank. When the heat radiation loss from 2 is small, A> B> C. In the following, A is the temperature on the forward path 5a side of the floor heating circulation pipe 5, for example, around 90 ° C. B is a tank hot water temperature taken out from the hot water outlet 10, for example, around 57 ° C. C is the temperature of tap water, for example, around 10 ° C. The tank hot water temperature B is a temperature near the temperature δ on the return path 5b side of the floor heating circulation pipe 5 (for example, lower than 90 ° C. and higher than the set terminal hot water temperature, for example, around 57 ° C.). To do. In the following, the temperature of the hot water (terminal hot water temperature) used on the hot water supply device side (the hot water terminal 3) such as a bath, a kitchen, and a shower is set to 38 ° C. to 45 ° C., for example. Note that the terminal hot water temperature may be set either in advance or sequentially by a remote controller.
[0020]
Next, the operation of the hot water storage type hot water supply floor heating system will be described by taking the usage pattern of the floor heating and hot water supply shown in FIG. 2 as an example. In FIG. 2, the early morning usage pattern a is floor heating only, the usage pattern b is both hot water and floor heating such as shampoo, the usage pattern c after evening is only floor heating, the usage pattern d is bath cooking, hot water and floor heating. All of the heat storage pattern e is a case where neither floor heating nor hot water is performed.
[0021]
First, in the early morning, all the hot water temperatures in the hot water storage tank 2 are in the high temperature hot water region S1 of 90 ° C. or higher. That is, before using in the early morning, as will be described later, the entire amount in the hot water storage tank 2 is heated in advance so as to become the high temperature hot water region S1 by using late-night power. In the above-mentioned usage pattern a only for floor heating, as shown in FIG. 3, all the hot water supply valves V (V1, V2,..., Vn) are closed so that hot water is not discharged from the hot water supply pipe 4, and only the floor heating pump 51 is used. Operate. As a result, the heat medium in the floor heating circulation pipe 5 circulates, and the heat medium supplied to the outward path 5a is exchanged between the hot water in the hot water storage tank 2 (about 90 ° C.) in the heat exchange section 7. Heat is exchanged and supplied into the floor heating panel 6. Then, the heat medium (temperature δ: around 57 ° C., for example) that has become a low temperature after heating the floor heating panel 6 returns to the return path 5b of the floor heating circulation pipe 5 and again has hot water (90 Heat exchange). At this time, as shown in FIG. 4, the hot water (about 57 ° C.) that has been subjected to heat exchange and becomes a low temperature becomes a descending water flow W along with the heat shielding plate 20 disposed below the heat exchange section 7. Without mixing, it descends to the lower layer, and the lower layer becomes the intermediate hot water region S2 (around 57 ° C.). Therefore, since the temperature of the hot water (around 90 ° C.) in the high temperature hot water region S1 in the middle layer portion and the upper layer portion does not decrease, the floor heating is not hindered.
[0022]
Then, the case where it shifts to the usage pattern b which performs both hot water supply and floor heating, and also the usage pattern c which performs bath cooking, hot water supply, and floor heating in the evening is demonstrated. At this time, the temperature distribution of the hot water in the hot water storage tank 2 is, for example, a high temperature hot water region S1 in which the upper layer portion is 90 ° C. and an intermediate hot water region S2 in which the middle layer portion includes a temperature around 57 ° C. In this case, the temperature sensors T (T1, T2,..., Tn) provided in a plurality of upper and lower sides in accordance with the set tank discharge temperature (for example, around 57 ° C.) are used for the hot water temperature (for example, 57 And the hot water outlet valve V of the hot water outlet 10 corresponding to this temperature is opened. At this time, when a plurality of hot water outlets 10 at around 57 ° C. are detected, only the hot water outlet valve V5 of the hot water outlet 10 located at the bottom of the intermediate hot water region S2 (or the hot water valve V5 of the intermediate hot water region S2). , V6 may be both). In addition, the mixing valve 11 of the hot water supply pipe 4 is switched in the direction of the arrow m2 in FIG. 5 so that the auxiliary hot water supply pipe 30 is fully closed and the hot water supply pipe 4 is fully opened, and the opening degree of the hot water mixing valve 12 is adjusted and set. The hot water in the hot water supply pipe 4 (around 57 ° C.) and the water from the water supply pipe 8 are mixed and supplied to the hot water terminal 3 so that the terminal hot water temperature (for example, 42 ° C.) is reached. At this time, city water is supplied from the water intake 9 at the lower end of the hot water storage tank 2 by the amount used for the hot water. Thereby, as shown in FIG. 5, the lower layer becomes a low temperature hot water region S3 of about 10 ° C.
[0023]
Thereafter, the upper layer portion in the hot water storage tank 2 has a high temperature hot water region S1 of 90 ° C., and the intermediate hot water region S2 containing hot water around 57 ° C. remains below it, and the middle layer portion and the lower layer portion have a temperature of 10 ° C. In the use pattern d in which the hot water is finished and only floor heating is performed in the low temperature hot water region S3, as shown in FIG. 6, all the hot water valves V are closed so as not to be discharged from the hot water supply pipe 4. Only the floor heating pump 51 is operated. At this time, all of the hot water (around 90 ° C.) remaining in the upper layer part can be used for floor heating.
[0024]
On the other hand, when the amount of discharged water is increased and the hot water in the intermediate hot water region S2 (around 57 ° C.) reaches the upper layer where the heat exchanging unit 7 is located, only the uppermost hot water valve V1 is opened to open the upper layer. Hot water can be used for hot water.
[0025]
Therefore, since hot water at around 57 ° C. is taken out and used from an arbitrary position on the side wall of the hot water storage tank 2, hot water in the high temperature hot water area S 1 of the hot water storage tank 2 is not taken out, which hinders floor heating. You can get out of the bath while avoiding the problem. In addition, as described above, the lower precipitation stream W around 57 ° C. generated in the upper heat exchanging portion 7 by the floor heating descends to the intermediate hot water region S2. Here, the temperature of the hot water used for hot water supply is approximately the same level as the temperature of the hot water falling (for example, around 57 ° C.), so that the downward water flow W can be used as it is for hot water supply. Since the descending water flow W pushes up the hot water, the upper layer portion of the hot water storage tank 2 is kept in the high temperature hot water region S1 and can be used effectively for all the heat exchange of the floor heating. Therefore, there is no need to wastefully heat the hot water in the hot water storage tank 2 by the heating unit 1 as in the prior art.
[0026]
When the terminal hot water temperature set at the time of hot water is not less than the temperature of the intermediate hot water region S2 (around 57 ° C.), for example, 60 ° C., the hot water valve S in the high temperature hot water region S1 is opened or the mixing valve 11 is switched in the direction of the arrow m1 in FIG. 6 so that the auxiliary hot water supply pipe 30 is fully opened and the hot water supply pipe 4 is fully closed, so that hot hot water is discharged from the auxiliary hot water outlet 32 at the upper end of the hot water storage tank 2. It becomes possible to supply to the hot water terminal 3.
[0027]
Further, the amount of hot water in the hot water storage tank 2 is reduced by the hot water, and water is newly supplied from the lower end of the hot water storage tank 2, but as the amount of water in the lower layer increases, the lower layer portion of the intermediate hot water region S2 gradually rises. As the temperature of the hot water outlet 10 decreases, the temperature of the hot water outlet 10 at around 57 ° C. is detected by the temperature sensor T. The hot water outlet valve V is closed, the hot water outlet 10 at around 57 ° C. is detected, and the hot water outlet valve V is opened. Such switching of the hot water valve V is repeated until the intermediate hot water region S2 reaches the upper layer where the heat exchange unit 7 is located. Thereby, the hot water in the intermediate hot water region S2 can be continuously supplied.
[0028]
As a result, in this hot water storage type hot water supply floor heating system, hot water corresponding to the set terminal hot water temperature can be supplied to the hot water terminal 3 while all hot water in the hot water storage tank 2 is used for floor heating. Or, it can be effectively used as hot water supply, energy efficiency is extremely improved, and electricity costs can be saved as compared with the prior art.
[0029]
When it is detected by the temperature sensor T in the hot water storage tank 2 that the water temperature in the hot water storage tank 2 has become below a certain temperature, the control unit 14 determines that the hot water in the hot water storage tank 2 has been used up. Then, the heat storage pattern e of FIG. 2 is executed. At this time, as shown in FIG. 7, the hot water storage tank is operated by operating the pump 50 of the heating unit 1 and exchanging heat between the hot water circulating in the circulation passage 17 of the hot water storage tank 2 and the heat medium of the heat pump 18. The hot water in 2 is heated. In this example, hot water can be stored in the hot water storage tank 2 by closing all the hot water outlet valves V, opening the on-off valve 46 and operating the pump 50 of the heating unit 1.
[0030]
In this example, a heat pump system is used as the heating unit 1. The characteristics of the heat pump 18 are shown in FIG. FIG. 8 shows the relationship between the inlet water temperature of the heat pump 18 and the COP during heating. COP is {amount of heat released when the refrigerant condenses / compressor power}. In FIG. 8, the COP is higher as the inlet water temperature of the heat pump 18 is lower. When the inlet water temperature of the heat pump 18 is, for example, 30 ° C. or lower, the COP is improved to 1.50 or higher. In the present invention, since almost all the amount of hot water (heat) in the main hot water storage tank 2 can be used up, heating is performed in a state where water is accumulated almost entirely in the hot water storage tank 2. Therefore, heat exchange is performed between the heat medium of the heat pump 18 and low-temperature water, and heating can be efficiently performed using the characteristic that the COP increases as the inlet water temperature of the heat pump 18 decreases. The heating by the heat pump 18 is performed at the stage where the hot water in the hot water storage tank 2 is used up, regardless of day or night.
[0031]
【The invention's effect】
  As described above, the invention according to claim 1 includes a hot water storage tank for storing hot water heated by the heating unit.,floorThe heat exchange part of the floor heating circulation pipe that circulates the heat medium for heating is placed in the hot water area where hot water for floor heating is stored in the upper part of the hot water storage tank, and is located at the lower end of the hot water storage tank. A water intake is provided to take in water from the water supply pipe, and a hot water storage tankOne side wallA hot water outlet for taking out hot water at a temperature close to the temperature of the heating medium returned to the return path of the circulation pipe for floor heating is provided, and a hot water supply pipe whose tip is connected to the hot water outlet is connected to the hot water outlet. Since the water supply pipe was connected via the hot water mixing valve between the hot water outlet of the hot water supply pipe and the hot water outlet terminal, the temperature of the heat medium returned from the hot water outlet of the hot water tank to the return side of the circulation pipe for floor heating The hot water at a nearby temperature will be taken out. As a result, it is not necessary to use hot water in the hot water storage area in the hot water storage tank when the hot water is discharged, and the hot water can be used as it is as a heat source for floor heating. In addition, the hot water descending from the heat exchanger pushes up the hot water in the hot water storage tank, making all the hot water used to heat the forward side of the floor heating circulation pipe effective for heat exchange in the floor heating. It becomes available. Accordingly, there is no need to wastefully heat the hot water in the hot water storage tank by the heating unit as in the prior art. Furthermore, by mixing the hot water in the hot water supply pipe and the water from the water supply pipe, the hot water at the set terminal hot water temperature can be continuously supplied to the hot water terminal. Therefore, in the hot water storage type hot water supply floor heating system, while hot water corresponding to the set terminal hot water temperature can be supplied to the hot water terminal, all hot water in the hot water storage tank is used for floor heating or hot water supply. As a result, the energy efficiency is extremely improved and the electricity cost can be saved as compared with the conventional one.Further, below the heat exchange part, a heat shielding plate is disposed that faces the other side wall in the hot water storage tank and descends while being inclined so as not to mix the low temperature precipitation stream with the hot water. The heat shielding plate is inclined downward facing the other side wall in the hot water storage tank, and thereby functions to lower the low temperature precipitation stream generated in the heat exchange section while not mixing with the hot water. Therefore, the hot water that has been subjected to heat exchange and has become a low temperature flows down to the lower layer without mixing with the hot water along the heat shielding plate disposed below the heat exchange part as a descending water flow. And since the temperature of the hot water in the high-temperature hot water region in the upper layer does not drop, the floor heating is not hindered.
[0032]
  In addition to the effect described in claim 1, the invention described in claim 2 provides a hot water outlet for the hot water storage tank.oneA plurality of hot water outlets that individually open and close each hot water outlet and a plurality of detection means that detect the temperature of the tank hot water for each hot water outlet. Each has a controller that controls the opening and closing of the hot water valve corresponding to an arbitrary set temperature by detecting the temperature of the hot water with the detecting means, so the amount of hot water in the hot water storage tank is reduced by the hot water, and the lower end of the hot water storage tank is When water is supplied from the water intake port, the low temperature hot water area in the lower part of the hot water storage tank increases and the temperature of the hot water discharge port where the hot water is discharged decreases, the hot water discharge port is closed, and the hot water is discharged by the detection means. The terminal hot water temperature requested from the hot water terminal while leaving hot water by detecting and opening a hot water outlet that is higher than the temperature and lower than the temperature on the outward side of the heat exchange section To continue the hot water can be supplied by.
[0033]
In addition to the effect of claim 1, the invention described in claim 3 is provided with a secondary hot water outlet for taking out hot water in the hot water storage tank at the upper end of the hot water storage tank, and the secondary hot water outlet is provided with a secondary hot water supply pipe. One end of the hot water supply pipe is connected, and the other end of the auxiliary hot water supply pipe is connected to the hot water supply valve and the hot water outlet of the hot water supply pipe through the mixing valve. When the temperature of the hot water becomes lower than the predetermined temperature, or the terminal hot water temperature is lower than the temperature of the intermediate hot water area in the hot water storage tank (the temperature of the hot water area is low and close to the temperature of the heating medium returned to the return side of the floor heating circulation pipe If the mixing valve is set so that the sub-hot water supply pipe is fully open and the hot water supply pipe is fully closed, the upper end of the hot water storage tank is Hot water from the secondary hot water outlet By tapping, it is possible to supply hot water commensurate with the terminal tapping temperature in tapping terminal.
[0034]
According to a fourth aspect of the present invention, in addition to the effects of any one of the first to third aspects, a channel inlet is provided at the upper end of the hot water storage tank, and a channel outlet is provided at the lower end. And the outlet of the channel are connected via a circulation channel arranged outside the tank, and a heating part is provided in the middle of the circulation channel, so the upper part of the hot water storage tank → the middle part → the lower part of the hot water storage tank High-temperature hot water can be efficiently stored in order.
[0035]
According to a fifth aspect of the present invention, in addition to the effect of the first or fourth aspect, the heating unit exchanges heat between a heat pump, a heat medium of the heat pump, and hot water circulating in the circulation passage. Since the heat exchanger can be used up almost all of the heat (heat) in the hot water tank effectively, water has accumulated in almost the entire hot water tank during heating. Since the heating is performed in a state, a heating system that takes advantage of the characteristics of the heat pump that COP increases as the inlet water temperature decreases can be realized.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram showing an example of an embodiment of the present invention.
FIG. 2 is an explanatory diagram of a floor heating and hot water supply usage pattern same as above.
[Fig. 3] Fig. 3 is a schematic configuration diagram showing a state where only floor heating is used.
FIG. 4 is an explanatory view of the descending water flow of the above.
FIG. 5 is a schematic configuration diagram of the use state of both the hot water and floor heating.
[Fig. 6] Fig. 6 is a schematic configuration diagram showing a state in which only floor heating is used after the hot water is discharged.
FIG. 7 is an explanatory diagram when heating is performed by the heating unit.
FIG. 8 is a graph showing the relationship between the inlet water temperature of the heat pump and the COP.
FIG. 9 is a block diagram of the control unit of the above.
[Explanation of symbols]
1 Heating part
2 Hot water storage tank
2a One side wall
2b Other side wall
3 Hot spring terminal
4 Hot water supply piping
5 Floor heating circulation pipe
5a Outbound
5b Return
7 Heat exchange section
8 Water supply pipe
9 Water intake
10 Hot water outlet
11 Mixing valve
12 Hot water mixing valve
13 Detection means
14 Control unit
15 Channel inlet
16 Channel outlet
17 Circulation channel
18 Heat pump
19 Heat exchanger
30 Sub hot water supply piping
32 Secondary hot water outlet
S1 Hot water area
S2 Intermediate hot water area
S3 low temperature hot water area
V Hot spring valve

Claims

A hot water storage tank for storing hot water heated by the heating unit and a heat exchange unit for a floor heating circulation pipe that circulates a heat medium for floor heating is used as hot water for floor heating at the upper part of the hot water storage tank. Is located in the hot water area where hot water is stored, a water intake port is provided at the lower end of the hot water storage tank to take in water from the water supply pipe, and a heating medium is returned to the return side of the floor heating circulation pipe on one side wall of the hot water storage tank. A hot water outlet for taking out hot water at a temperature close to the temperature is provided, a hot water supply pipe whose tip is connected to the hot water outlet terminal is connected to the hot water outlet, and hot water is provided between the hot water outlet of the hot water supply pipe and the hot water outlet terminal. Heat that is connected to a water supply pipe via a mixing valve and descends downwardly facing the other side wall of the hot water tank below the heat exchanging part so that the low temperature precipitation stream is not mixed with hot water. Patent in that a shielding plate Hot water storage type hot water floor heating system that.

A plurality of hot water outlets are provided at intervals in the vertical direction of one side wall of the hot water storage tank. Each hot water outlet has a plurality of hot water outlet valves for individually opening and closing each hot water outlet, and the temperature of the hot water for each hot water outlet. A plurality of detection means for detecting each of the detection means, and a control unit for detecting the temperature of the hot water by the detection means and controlling opening and closing of a hot water valve corresponding to an arbitrary set temperature is provided. Hot water storage hot water floor heating system.

At the upper end of the hot water storage tank, an auxiliary hot water outlet for taking out hot water in the hot water storage tank is provided, one end of the auxiliary hot water supply pipe is connected to the auxiliary hot water outlet, and the other end of the auxiliary hot water supply pipe is connected via the mixing valve. The hot water storage hot water floor heating system according to claim 1, wherein the hot water storage floor heating system is connected to a hot water mixing valve and a hot water outlet of the hot water supply pipe.

A flow path inlet is provided at the upper end of the hot water storage tank, and a flow path outlet is provided at the lower end. The flow path inlet and the flow path outlet are connected via a circulation flow path arranged outside the tank, and in the middle of the circulation flow path. The hot water storage hot water floor heating system according to any one of claims 1 to 3, further comprising a heating unit.

The said heating part is comprised by the heat exchanger and the heat exchanger which heat-exchanges between the heat medium of a heat pump, and the hot water circulating in a circulation flow path, The claim 1 or Claim 4 characterized by the above-mentioned. Hot water storage floor heating system.