JP2004225926A

JP2004225926A - Heat pump type hot water supply device and heat pump type hot water supply heating device

Info

Publication number: JP2004225926A
Application number: JP2003010496A
Authority: JP
Inventors: Koji Namikata; 浩二南方; Tadao Okada; 忠夫岡田; Kiyoshi Koyama; 清小山; Satoshi Hoshino; 聡星野; Yoshio Muto; 好夫武藤; Fumiaki Sato; 文明佐藤
Original assignee: Sanyo Electric Co Ltd; Sanyo Electric Air Conditioning Co Ltd
Current assignee: Sanyo Electric Co Ltd; Sanyo Electric Air Conditioning Co Ltd
Priority date: 2003-01-20
Filing date: 2003-01-20
Publication date: 2004-08-12
Anticipated expiration: 2023-01-20
Also published as: JP3869801B2; CN1244774C; CN1517604A

Abstract

<P>PROBLEM TO BE SOLVED: To lower a refrigerant temperature to cope with various heating loads even when the heat is not sufficiently radiated in a water refrigerant heat exchanger for supplying hot water or a water refrigerant heat exchanger for heating. <P>SOLUTION: This heat pump type hot water supply device comprises a refrigerant circuit R obtained by successively circularly connecting a compressor 11, a parallel circuit of the first water refrigerant heat exchanger 9 and the second water refrigerant heat exchanger 12, an internal heat exchanger 15, a decompressor 16 and an air heat exchanger 17, a first hot water circulating passage C1 for circulating the hot water between the first water refrigerant heat exchanger 9 and a hot water heater such as floor heating panels 1, 2, a second hot water circulating passage C2 for circulating the hot water between the second heat refrigerant heat exchanger 12 and a hot water storage tank 26, and a control means S1 performing the control to execute the heat exchanging between the refrigerant flowing out from the first water refrigerant heat exchanger 9 or the second water refrigerant heat exchanger 12 and the refrigerant flowing out from the air heat exchanger 17 by the internal heat exchanger 15 during hot water heating operation by the first hot water circulating passage C1, or hot water storing operation by the second hot water circulating passage C2. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、ＨＦＣやＣＯ_２等の冷媒を用いたヒートポンプ式給湯装置やヒートポンプ式給湯暖房装置に関する。
【０００２】
【従来の技術】
従来のこの種のヒートポンプ式給湯暖房装置は、ヒートポンプユニットで熱交換して得られた高温水を貯湯タンクに貯湯・蓄熱し、このタンクの高温水を給湯や風呂に使用するとともに、この高温水と熱交換して得られた暖房用温水を用いて温水暖房を行うものが知られている。このものでは、暖房負荷が大きいと十分な温度の温水が得られないものであった。
【０００３】
また、ヒートポンプユニットの冷媒回路に給湯用の水冷媒熱交換器と暖房用の水冷媒熱交換器を組み込み、貯湯運転と温水暖房運転が行えるようにしたものが知られている（例えば、特許文献１参照）。
【０００４】
ところが、このものでは、温水暖房運転中に暖房負荷が少なくなると、温水循環路の戻り側の温水温度が高くなり、熱交換が十分に行われずに冷媒温度が高くなり、圧縮機の負荷が高くなる問題があり、圧縮機の保護のため運転を停止せざるを得なかった。そのため、ヒートポンプユニットを暖房用に使用する場合、暖房用温水循環路の戻り温度が高い場合には対応が困難となっていた。
【０００５】
【特許文献１】
特開２００２−２５７３６６号公報
【０００６】
【発明が解決しようとする課題】
そこで本発明は、貯湯運転や温水暖房運転が行えるようにしたものにおいて、給湯用の水冷媒熱交換器や暖房用の水冷媒熱交換器での放熱が十分行われなくとも、これとは別に熱交換器を設けることにより冷媒温度の低下を可能として、種々の暖房負荷に対応できるようにすることを目的とする。
【０００７】
【課題を解決するための手段】
このため第１の発明は、圧縮機、水冷媒熱交換器、内部熱交換器、減圧装置及び空気熱交換器とを順次環状に接続してなる冷媒回路と、前記水冷媒熱交換器と貯湯タンクとの間で温水を循環させる温水循環路と、該温水循環路による貯湯運転中に前記水冷媒熱交換器から流出した冷媒と前記空気熱交換器から流出した冷媒との熱交換を前記内部熱交換器が行うように制御する制御手段とを備えたことを特徴とする。
【０００８】
第２の発明は、圧縮機、第１水冷媒熱交換器と第２水冷媒熱交換器との並列回路、内部熱交換器、減圧装置及び空気熱交換器とを順次環状に接続してなる冷媒回路と、前記第１水冷媒熱交換器と温水暖房器との間で温水を循環させる第１温水循環路と、前記第２水冷媒熱交換器と貯湯タンクとの間で温水を循環させる第２温水循環路と、前記第１温水循環路による温水暖房運転中に前記第１水冷媒熱交換器から流出した冷媒と前記空気熱交換器から流出した冷媒との熱交換を前記内部熱交換器が行うように制御する制御手段とを備えたことを特徴とする。
【０００９】
第３の発明は、圧縮機、第１水冷媒熱交換器と第２水冷媒熱交換器との並列回路、内部熱交換器、減圧装置及び空気熱交換器とを順次環状に接続してなる冷媒回路と、前記第１水冷媒熱交換器と温水暖房器との間で温水を循環させる第１温水循環路と、前記第２水冷媒熱交換器と貯湯タンクとの間で温水を循環させる第２温水循環路と、該第２温水循環路による貯湯運転中に第２水冷媒熱交換器から流出した冷媒と前記空気熱交換器から流出した冷媒との熱交換を前記内部熱交換器が行うように制御する制御手段とを備えたことを特徴とする。
【００１０】
第４の発明は、圧縮機、第１水冷媒熱交換器と第２水冷媒熱交換器との並列回路、内部熱交換器、減圧装置及び空気熱交換器とを順次環状に接続してなる冷媒回路と、前記第１水冷媒熱交換器と温水暖房器との間で温水を循環させる第１温水循環路と、前記第２水冷媒熱交換器と貯湯タンクとの間で温水を循環させる第２温水循環路と、前記第１温水循環路による温水暖房運転中及び前記第２温水循環路による貯湯運転中に前記第１水冷媒熱交換器及び第２水冷媒熱交換器から流出した冷媒と前記空気熱交換器から流出した冷媒との熱交換を前記内部熱交換器が行うように制御する制御手段とを備えたことを特徴とする。
【００１１】
【発明の実施の形態】
以下、本発明の実施の形態を図面に基づき説明する。図１はヒートポンプ式給湯暖房装置の全体システムを示す系統図である。図１において、Ａはヒートポンプユニット、Ｂはタンクユニット、Ｃ１は温水暖房用の第１温水循環路、Ｃ２は貯湯用の第２温水循環路、ＲはヒートポンプユニットＡに内蔵された冷媒回路である。ＨＦＣやＣＯ_２等の冷媒を用いることができるが、本実施形態ではＣＯ_２を用いる。
【００１２】
１及び２は第１温水循環路Ｃ１に設けられた床暖房パネル、３及び４は床暖房パネル１及び２に対応して設けられた床暖房リモートコントローラ（以下、「床暖房リモコン」という）であり、前記第１温水循環路Ｃ１には、熱動弁５及び６、循環ポンプ７、膨張タンク８、第１水冷媒熱交換器９の水流路９Ｂ、バイパス管１０などが設けられている。
【００１３】
前記冷媒回路Ｒは、ＣＯ_２冷媒を用いた能力調整が可能な２段圧縮式の圧縮機１１と、前記第１水冷媒熱交換器９の冷媒流路９Ａ、第２水冷媒熱交換器１２の一次流路１２Ａ、一端が前記冷媒流路９Ａに接続される第１開閉弁１３及び一端が一次流路１２Ａに接続される第２開閉弁１４と、第１及び第２開閉弁１３、１４が接続される内部熱交換器１５の一次流路１５Ａ、膨張弁（減圧装置）１６、空気熱交換器１７と、内部熱交換器１５の二次流路１５Ｂと、アキュムレーター１８とが順次環状に配管接続されている。
【００１４】
前記温水循環路Ｃ１には、第１水冷媒熱交換器９の水流路９Ｂから流出した暖房用温水の温度を検出するサーミスタ１９、流量調整弁２０、浴室暖房用のファンコイル２１が設けられている。２２は浴室暖房リモートコントローラ（以下、「浴室暖房リモコン」という）、２３はファンコイルの２１の入口部に設けられた熱動弁、２４は循環ポンプ７によって膨張タンク８から流出した温水の一部を床暖房パネル１、２に供給するための熱動弁、２５は床暖房パネル１、２に流入する温水温度を検知するサーミスタである。
【００１５】
前記第２温水循環路Ｃ２は、第２水冷媒熱交換器１２の水流路１２Ｂと貯湯タンク２６とが循環ポンプ２７、流量調整弁２９を介して環状に接続されている。３０は第２水冷媒熱交換器１２の水流路１２Ｂから流出した温水温度を検知するサーミスタである。
【００１６】
前記貯湯タンク２６には水々熱交換器３１の一次流路３１Ａが循環ポンプ３２を介して接続されている。また、水々熱交換器３１の二次流路３１Ｂには循環ポンプ３３を介して浴槽３４が接続されている。３５は貯湯タンク２６の上部に接続された給湯管であり、この給湯管３５にはミキシングバルブ３６が設けられている。３８は給水管であり、この給水管３８は貯湯タンク２６の下部とミキシングバルブ３６とに分岐接続され、更に開閉弁３９を介して膨張タンク８に接続されている。
【００１７】
なお、部屋が暖まってくると、床暖房パネル１、２ではそれほど放熱されなくなり、膨張タンク８から水冷媒熱交換器９へは５０〜６０℃の高温水が供給されることとなるため、水冷媒熱交換器９ではそれほど熱交換されず、冷媒温度も高温となり、圧縮機１１に高負荷が掛かることとなる。そこで、高温となった冷媒の冷却機構として前記水冷媒熱交換器９の他に設けたのが前記内部熱交換器１５である。この内部熱交換器１５での放熱分は同じ冷媒回路Ｒ内の空気熱交換器１７を通過した後の冷媒に取込まれるので、冷媒回路Ｒの吸熱効率をも向上させている。
【００１８】
また、ヒートポンプユニットＡとタンクユニットＢにはそれぞれマイクロコンピュータから成る制御装置（制御手段）Ｓ１、Ｓ２が設けられている。この制御装置Ｓ１、Ｓ２は床暖房リモコン３、４や浴室暖房用ファンコイル２１からの運転信号や温度信号と、サーミスタ１９、２５、３０の温度信号とに応じて、圧縮機１１の運転と周波数制御、循環ポンプ７、２７の運転制御、熱動弁５、６、２４、膨張弁１６の開度制御、流量調整弁２０、２９の開度制御などを行うものであり、以下その動作を説明する。
【００１９】
〈床暖房運転〉
床暖房パネル１による床暖房を行う場合、その部屋の壁面等に取り付けられた床暖房リモコン３の運転スイッチをオンにする。すると、これに対応した熱動弁５が開き、循環ポンプ７が運転し、第１温水循環路Ｃ１では、膨張タンク８→循環ポンプ７→第１水冷媒熱交換器９の水流路９Ｂ→流量調整弁２０→熱動弁５→床暖房パネル１→膨張タンク８の順に温水が流れる。なお、バイパス管１０は、熱動弁５が開くのに時間がかかり、また熱動弁５が故障している場合でも対応できるように、温水の一部をバイパスさせるものであり、微少量の温水が流れる。
【００２０】
また、前記床暖房リモコン３の運転スイッチをオンにした際に、ヒートポンプユニットＡの圧縮機１１が運転すると共に第１開閉弁１３が開き、冷媒回路Ｒでは、圧縮機１１→第１水冷媒熱交換器９の冷媒流路９Ａ→第１開閉弁１３→内部１５の一次流路１５Ａ→膨張弁１６→空気熱交換器１７→内部熱交換器１５の二次流路１５Ｂ→アキュムレーター１８→圧縮機１１の順に冷媒が流れる。このとき、貯湯は行われないので、第２開閉弁１４は閉じており、水冷媒熱交換器１２の一次流路１２Ａには冷媒は流れない。
【００２１】
前記床暖房パネル１に供給される温水の温度は６０〜７０℃であるが、サーミスタ１９が検知する温水温度がこの温度になるように圧縮機１１の周波数制御、膨張弁１６の弁開度制御及び流量調整弁２０の弁開度制御が行われる。
【００２２】
また、床暖房制御は、床暖房リモコン３に搭載された室温サーミスタ（図示せず）により室温を検知し、設定温度と室温との偏差に基づき熱動弁５を開閉制御し、床暖房パネル１への温水量を制御することにより行われる。
【００２３】
また、床暖房パネル２で同時に床暖房を行う場合、床暖房リモコン４の運転スイッチをオンにすることにより、同様に熱動弁６が開閉制御され、床暖房パネル１及び２に同時に温水が供給され、床暖房パネル１及び２への温水量を個別に制御することにより、床暖房の個別制御が可能となっている。
【００２４】
このような床暖房運転を行う場合、床暖房する部屋が暖まってくると、床暖房パネル１、２からの放熱量が小さくなり、膨張タンク８から水冷媒熱交換器９の水流路９Ｂへは５０〜６０℃の温水が供給されることとなる。このため、水冷媒熱交換器９ではそれほど熱交換されず、冷媒温度も高温となって圧縮機１１に負荷がかかる。このような場合の冷媒の冷却機構として設けたのが内部熱交換器１５であり、内部熱交換器１５の一次流路１５Ａでの放熱分は同じ冷媒回路Ｒにある内部熱交換器１５の二次流路１５Ｂで再度吸収されるため、無駄なく、効率を落とすことなく、冷媒回路Ｒを構成できる。
【００２５】
〈浴室暖房運転〉
ファンコイル２１による浴室の温風暖房を行う場合、浴室暖房リモコン２２をオンにする。すると、ファンコイル２１入口部の熱動弁２３が開き、循環ポンプ７が運転する。第１温水循環路Ｃ１では、膨張タンク８→循環ポンプ７→第１水冷媒熱交換器９の水流路９Ｂ→流量調整弁２０→熱動弁２３→ファンコイル２１→膨張タンク８の順に温水が流れる。バイパス管１０は、熱動弁２３が開くのに時間がかかり、また熱動弁２３が故障している場合でも対応できるように、温水の一部をバイパスさせるものであり、微少量の温水が流れる。
【００２６】
ヒートポンプユニットＡの動作と冷媒循環は床暖房運転と同様であり、貯湯は行われないので、第２開閉弁１４は閉じており、水冷媒熱交換器１２の一次流路１２Ａには冷媒は流れない。
【００２７】
前記ファンコイル２１に供給される温水の温度は８０℃であるが、そのための温水制御は床暖房運転の場合と同様である。また、浴室暖房制御はファンコイル２１に搭載された室温サーミスタ（図示せず）により室温を検知し、ファン回転数を制御し、熱動弁２３を開閉制御することにより行われる。
【００２８】
〈床暖房と浴室暖房の同時運転〉
床暖房パネル１、２による床暖房と、ファンコイル２１による浴室温風暖房を同時に行う場合、それぞれのリモコン３、４、２２の運転スイッチをオンにする。すると、熱動弁５、６、２３が開き、循環ポンプ７が運転し、第１温水循環路Ｃ１では、膨張タンク８→循環ポンプ７→第１水冷媒熱交換器９の水流路９Ｂ→流量調整弁２０→熱動弁５、６→床暖房パネル１、２→膨張タンク８の順に温水が流れると共に、膨張タンク８→循環ポンプ７→第１水冷媒熱交換器９の水流路９Ｂ→流量調整弁２０→熱動弁２３→ファンコイル２１→膨張タンク８の順に温水が流れる。
【００２９】
バイパス管１０は、熱動弁５、６、２３が開くのに時間がかかり、また熱動弁５、６、２３が故障している場合でも対応できるように、温水の一部をバイパスさせるものであり、微少量の温水が流れる。
【００３０】
このときのサーミスタ１９による温水温度制御は８０℃であるが、これでは床暖房パネル１、２用の温水としては温度が高すぎることになる。これを解決するために、熱動弁２４を開くことで８０℃の温水に膨張タンク８からの中温水を混ぜ、サーミスタ２５にて検知される温水の温度が６０〜７０℃になるように制御している。また、中温水を混ぜすぎて低温になった場合は熱動弁２４を閉じ、サーミスタ２５の検知温度に基づく熱動弁２４の開閉制御を行う。
【００３１】
ヒートポンプユニットＡの動作と冷媒循環は床暖房運転又は浴室暖房運転と同様であり、貯湯は行われないので、第２開閉弁１４は閉じており、水冷媒熱交換器１２の一次流路１２Ａには冷媒は流れない。
【００３２】
〈貯湯運転〉
貯湯タンク２６に貯湯を行う場合、循環ポンプ２７が運転し、第２温水循環路Ｃ２では、貯湯タンク２６→循環ポンプ２７→第２水冷媒熱交換器１２の水流路１２Ｂ→流量調整弁２９→貯湯タンク２６の順に給湯用の温水が流れ、貯湯タンク２６に貯湯される。
【００３３】
ヒートポンプユニットＡでは圧縮機１１が運転すると共に第２開閉弁１４が開き、冷媒回路Ｒでは、圧縮機１１→第２水冷媒熱交換器１２の一次流路１２Ａ→内部熱交換器１５の一次流路１５Ａ→膨張弁１６→空気熱交換器１７→内部熱交換器１５の二次流路１５Ｂ→アキュムレーター１８→圧縮機１１の順に冷媒が流れる。このとき、暖房は行われないので、第１開閉弁１３は閉じており、水冷媒熱交換器９の一次流路９Ａには冷媒は流れない。
【００３４】
従って、貯湯タンク２６への貯湯の際にも、第２水冷媒熱交換器１２から流出した冷媒と空気熱交換器１７から流出した冷媒との熱交換を前記内部熱交換器１５が行うものであるから、より高温の給水にも対応でき、貯湯タンク２６全体のより高温度の保温が可能となる。
【００３５】
貯湯タンク２６へ供給される温水温度は９０℃であるが、サーミスタ３０が検知する温度がこの温度になるように、圧縮機１１の周波数制御、膨張弁１６の弁開度制御、流量調整弁２９の弁開度制御が行われる。
【００３６】
貯湯タンク２６に貯湯された高温水はミキシングバルブ３６にて適度な温度に調整され、給湯管３５から台所やシャワーへの給湯や浴槽３４へのお湯張り等に利用される。そして、給湯が行われると、給水管３８から貯湯タンク２６に給水が行われる。また、循環ポンプ３２、３３を運転することにより、貯湯タンク２６の高温水と浴槽３４の温水を水々熱交換器３１で熱交換し、浴槽３４の温水の追い焚きを行うこともできる。
【００３７】
〈暖房と貯湯の同時運転〉
この場合の暖房用温水の循環経路と貯湯用の温水の循環経路は上述したとおりである。冷媒回路Ｒでは、第１及び第２開閉弁１３、１４が共に開き、圧縮機１１→第１水冷媒熱交換器９の冷媒流路９Ａ及び第２水冷媒熱交換器１２の一次流路１２Ａ→内部熱交換器１５の一次流路１５Ａ→膨張弁１６→空気熱交換器１７→内部熱交換器１５の二次流路１５Ｂ→アキュムレーター１８→圧縮機１１の順に冷媒が流れる。このとき、第１水冷媒熱交換器９、第２水冷媒熱交換器１２及び内部熱交換器１５で熱交換が行われるのは言うまでもない。
【００３８】
また、サーミスタ１９、２５、３０においてそれぞれ上述した目標温度になるように、圧縮機１１の周波数制御、膨張弁１６の弁開度制御、流量調整弁２０、２９の弁開度制御が行われる。同時運転が行われた場合には、圧縮機１１は最大能力で運転するようにしてあり、暖房側と貯湯側とで十分な能力が得られるようにしてある。
【００３９】
以上本発明の実施態様について説明したが、上述の説明に基づいて当業者にとって種々の代替例、修正又は変形が可能であり、本発明の趣旨を逸脱しない範囲で前述の種々の代替例、修正又は変形を包含するものである。
【００４０】
【発明の効果】
以上のように本発明は、貯湯運転や温水暖房運転が行えるようにしたものにおいて、給湯用の水冷媒熱交換器や暖房用の水冷媒熱交換器での放熱が十分行われなくとも、これとは別に熱交換器を設けることにより冷媒温度の低下を可能として、種々の暖房負荷に対応できる。
【図面の簡単な説明】
【図１】ヒートポンプ式給湯暖房装置の全体系統図である。
【符号の説明】
１、２床暖房パネル（温水暖房器）
９、１２水冷媒熱交換器
１１圧縮機
１５内部熱交換器
１６膨張弁（減圧装置）
１７空気熱交換器
２６貯湯タンク
Ｃ１第１温水循環路
Ｃ２第２温水循環路
Ｒ冷媒回路
Ｓ１、Ｓ２制御装置（制御手段）[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a heat pump water heater and a heat pump water heater using a refrigerant such as HFC or CO ₂ .
[0002]
[Prior art]
Conventional heat pump hot water supply and heating devices of this type store and store high-temperature water obtained by heat exchange in a heat pump unit in a hot water storage tank, use the high-temperature water in the tank for hot water supply and bathing, and use this high-temperature water Is known that performs hot water heating using heating hot water obtained by heat exchange with water. In this case, if the heating load is large, hot water of a sufficient temperature cannot be obtained.
[0003]
There is also known a heat pump unit in which a water-refrigerant heat exchanger and a water-refrigerant heat exchanger for heating are incorporated in a refrigerant circuit of a heat pump unit so that a hot-water storage operation and a hot-water heating operation can be performed (for example, see Patent Document 1). 1).
[0004]
However, in this case, when the heating load decreases during the hot water heating operation, the temperature of the hot water on the return side of the hot water circulation path increases, the refrigerant temperature increases due to insufficient heat exchange, and the load on the compressor increases. The operation had to be stopped to protect the compressor. Therefore, when the heat pump unit is used for heating, it is difficult to cope with the case where the return temperature of the heating hot water circulation path is high.
[0005]
[Patent Document 1]
JP 2002-257366 A
[Problems to be solved by the invention]
Therefore, the present invention provides a hot water storage operation or a hot water heating operation, and even if the heat is not sufficiently released in the water refrigerant heat exchanger for hot water supply or the water refrigerant heat exchanger for heating, the present invention is applied separately. An object of the present invention is to provide a heat exchanger so that the temperature of a refrigerant can be reduced, so that it can cope with various heating loads.
[0007]
[Means for Solving the Problems]
Therefore, the first invention provides a refrigerant circuit in which a compressor, a water-refrigerant heat exchanger, an internal heat exchanger, a decompression device, and an air heat exchanger are sequentially connected in a ring shape, and the water-refrigerant heat exchanger and hot water storage A hot water circulation path for circulating hot water between the tank and the hot water circulation path, and heat exchange between the refrigerant flowing out of the water refrigerant heat exchanger and the refrigerant flowing out of the air heat exchanger during the hot water storage operation by the hot water circulation path. Control means for controlling the heat exchanger to perform the heat exchange.
[0008]
According to a second aspect of the invention, a compressor, a parallel circuit of a first water-refrigerant heat exchanger and a second water-refrigerant heat exchanger, an internal heat exchanger, a pressure reducing device, and an air heat exchanger are sequentially connected in a ring shape. A refrigerant circuit, a first hot water circulation path for circulating hot water between the first water-refrigerant heat exchanger and the hot water heater, and circulating hot water between the second water-refrigerant heat exchanger and the hot water storage tank. A second hot water circulation path and the internal heat exchange between the refrigerant flowing out of the first water-refrigerant heat exchanger and the refrigerant flowing out of the air heat exchanger during the hot water heating operation by the first hot water circulation path. And control means for controlling the container to perform the operation.
[0009]
According to a third aspect of the present invention, a compressor, a parallel circuit of a first water-refrigerant heat exchanger and a second water-refrigerant heat exchanger, an internal heat exchanger, a pressure reducing device, and an air heat exchanger are sequentially connected in a ring shape. A refrigerant circuit, a first hot water circulation path for circulating hot water between the first water-refrigerant heat exchanger and the hot water heater, and circulating hot water between the second water-refrigerant heat exchanger and the hot water storage tank. A second hot water circulation path, and the internal heat exchanger performs heat exchange between the refrigerant flowing out of the second water-refrigerant heat exchanger and the refrigerant flowing out of the air heat exchanger during the hot water storage operation by the second hot water circulation path. And control means for performing the control.
[0010]
According to a fourth aspect of the present invention, a compressor, a parallel circuit of a first water-refrigerant heat exchanger and a second water-refrigerant heat exchanger, an internal heat exchanger, a pressure reducing device, and an air heat exchanger are sequentially connected in a ring shape. A refrigerant circuit, a first hot water circulation path for circulating hot water between the first water-refrigerant heat exchanger and the hot water heater, and circulating hot water between the second water-refrigerant heat exchanger and the hot water storage tank A second hot water circulation path, and a refrigerant flowing out of the first water / refrigerant heat exchanger and the second water / refrigerant heat exchanger during the hot water heating operation by the first hot water circulation path and during the hot water storage operation by the second hot water circulation path Control means for controlling heat exchange between the internal heat exchanger and the refrigerant flowing out of the air heat exchanger.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a system diagram showing an entire system of a heat pump hot water supply / room heating device. In FIG. 1, A is a heat pump unit, B is a tank unit, C1 is a first hot water circulation path for hot water heating, C2 is a second hot water circulation path for storing hot water, and R is a refrigerant circuit built in the heat pump unit A. . Although a refrigerant such as HFC or CO ₂ can be used, in this embodiment, CO ₂ is used.
[0012]
Reference numerals 1 and 2 denote floor heating panels provided in the first hot water circulation path C1, and reference numerals 3 and 4 denote floor heating remote controllers (hereinafter, “floor heating remote controllers”) provided corresponding to the floor heating panels 1 and 2. The first hot water circulation path C1 is provided with thermal valves 5 and 6, a circulation pump 7, an expansion tank 8, a water flow path 9B of the first water / refrigerant heat exchanger 9, a bypass pipe 10, and the like.
[0013]
The refrigerant circuit R includes a two-stage compression type compressor 11 capable of adjusting the capacity using a CO ₂ refrigerant, a refrigerant passage 9A of the first water refrigerant heat exchanger 9, and a second water refrigerant heat exchanger 12 A first opening / closing valve 13 having one end connected to the refrigerant passage 9A, a second opening / closing valve 14 having one end connected to the primary passage 12A, and first and second opening / closing valves 13, 14 The primary flow path 15A, the expansion valve (decompression device) 16, the air heat exchanger 17, the secondary flow path 15B of the internal heat exchanger 15, and the accumulator 18 to which the internal heat exchanger 15 is connected are sequentially annular. Is connected to the piping.
[0014]
The hot water circulation path C1 is provided with a thermistor 19 for detecting the temperature of the heating hot water flowing out of the water flow path 9B of the first water / refrigerant heat exchanger 9, a flow control valve 20, and a fan coil 21 for bathroom heating. I have. 22 is a bathroom heating remote controller (hereinafter referred to as "bathroom heating remote controller"), 23 is a thermal valve provided at an inlet of the fan coil 21, and 24 is a part of hot water flowing out of the expansion tank 8 by the circulation pump 7. Is a thermal valve for supplying the floor heating panels 1 and 2, and 25 is a thermistor for detecting the temperature of the hot water flowing into the floor heating panels 1 and 2.
[0015]
In the second hot water circulation path C2, a water flow path 12B of the second water / refrigerant heat exchanger 12 and a hot water storage tank 26 are connected in a ring shape via a circulation pump 27 and a flow rate adjustment valve 29. Reference numeral 30 denotes a thermistor that detects the temperature of hot water flowing out of the water flow path 12B of the second water-refrigerant heat exchanger 12.
[0016]
The hot water storage tank 26 is connected to a primary flow path 31 </ b> A of the water / heat exchanger 31 via a circulation pump 32. Further, a bath tub 34 is connected to a secondary flow path 31B of the water / water heat exchanger 31 via a circulation pump 33. Reference numeral 35 denotes a hot water supply pipe connected to an upper portion of the hot water storage tank 26, and the hot water supply pipe 35 is provided with a mixing valve 36. Reference numeral 38 denotes a water supply pipe. The water supply pipe 38 is branched and connected to a lower portion of the hot water storage tank 26 and the mixing valve 36, and further connected to the expansion tank 8 via an on-off valve 39.
[0017]
When the room is warmed up, the floor heating panels 1 and 2 do not dissipate much heat, and high-temperature water of 50 to 60 ° C. is supplied from the expansion tank 8 to the water / refrigerant heat exchanger 9. In the refrigerant heat exchanger 9, heat is not so much exchanged, the refrigerant temperature also becomes high, and a high load is applied to the compressor 11. Therefore, the internal heat exchanger 15 is provided in addition to the water-refrigerant heat exchanger 9 as a cooling mechanism for the high-temperature refrigerant. Since the heat radiated by the internal heat exchanger 15 is taken into the refrigerant after passing through the air heat exchanger 17 in the same refrigerant circuit R, the heat absorption efficiency of the refrigerant circuit R is also improved.
[0018]
The heat pump unit A and the tank unit B are provided with control devices (control means) S1 and S2 each including a microcomputer. The control devices S1 and S2 control the operation and frequency of the compressor 11 according to the operation signals and temperature signals from the floor heating remote controllers 3 and 4 and the bathroom heating fan coil 21 and the temperature signals of the thermistors 19, 25 and 30. Control, the operation control of the circulation pumps 7, 27, the opening control of the thermal valves 5, 6, 24, and the expansion valve 16, the opening control of the flow regulating valves 20, 29, and the like. I do.
[0019]
<Floor heating operation>
When floor heating is performed by the floor heating panel 1, the operation switch of the floor heating remote controller 3 attached to the wall surface or the like of the room is turned on. Then, the corresponding thermal valve 5 is opened, the circulation pump 7 is operated, and in the first hot water circulation path C1, the expansion tank 8 → the circulation pump 7 → the water flow path 9B of the first water / refrigerant heat exchanger 9 → the flow rate Hot water flows in the order of the regulating valve 20 → the thermal valve 5 → the floor heating panel 1 → the expansion tank 8. It should be noted that the bypass pipe 10 bypasses a portion of the hot water so that it takes time for the thermal valve 5 to open and can cope with the case where the thermal valve 5 is out of order. Hot water flows.
[0020]
Further, when the operation switch of the floor heating remote controller 3 is turned on, the compressor 11 of the heat pump unit A operates and the first opening / closing valve 13 opens, and in the refrigerant circuit R, the compressor 11 → the first water refrigerant heat The refrigerant flow path 9A of the exchanger 9 → the first opening / closing valve 13 → the primary flow path 15A of the inside 15 → the expansion valve 16 → the air heat exchanger 17 → the secondary flow path 15B of the internal heat exchanger 15 → the accumulator 18 → compression. The refrigerant flows in the order of the machine 11. At this time, since the hot water is not stored, the second on-off valve 14 is closed, and the refrigerant does not flow through the primary flow path 12A of the water-refrigerant heat exchanger 12.
[0021]
Although the temperature of the hot water supplied to the floor heating panel 1 is 60 to 70 ° C., the frequency control of the compressor 11 and the valve opening control of the expansion valve 16 are performed so that the hot water temperature detected by the thermistor 19 becomes this temperature. And the valve opening degree control of the flow control valve 20 is performed.
[0022]
In the floor heating control, a room temperature thermistor (not shown) mounted on the floor heating remote controller 3 detects the room temperature, and controls the opening and closing of the thermal valve 5 based on the deviation between the set temperature and the room temperature. This is done by controlling the amount of hot water to
[0023]
When the floor heating panel 2 performs floor heating at the same time, by turning on the operation switch of the floor heating remote controller 4, the thermal valve 6 is similarly controlled to open and close, and hot water is simultaneously supplied to the floor heating panels 1 and 2. By individually controlling the amount of hot water to the floor heating panels 1 and 2, individual control of floor heating is possible.
[0024]
When such a floor heating operation is performed, when the room to be heated becomes warm, the amount of heat radiated from the floor heating panels 1 and 2 is reduced, and the heat is transferred from the expansion tank 8 to the water flow path 9B of the water / refrigerant heat exchanger 9. Warm water of 50 to 60 ° C. will be supplied. Therefore, the water-refrigerant heat exchanger 9 does not exchange heat so much, the refrigerant temperature becomes high, and a load is applied to the compressor 11. In such a case, the internal heat exchanger 15 is provided as a cooling mechanism of the refrigerant, and the heat radiated from the primary flow path 15A of the internal heat exchanger 15 is equal to the internal heat exchanger 15 in the same refrigerant circuit R. Since the refrigerant is absorbed again in the next flow path 15B, the refrigerant circuit R can be configured without waste and without reducing the efficiency.
[0025]
<Bathroom heating operation>
When performing warm air heating of the bathroom by the fan coil 21, the bathroom heating remote control 22 is turned on. Then, the thermal valve 23 at the inlet of the fan coil 21 opens, and the circulation pump 7 operates. In the first hot water circulation path C1, hot water flows in the order of the expansion tank 8, the circulation pump 7, the water flow path 9B of the first water-refrigerant heat exchanger 9, the flow control valve 20, the thermal valve 23, the fan coil 21, and the expansion tank 8. Flows. The bypass pipe 10 bypasses a portion of the hot water so that it takes time for the thermal valve 23 to open, and can cope with the case where the thermal valve 23 is out of order. Flows.
[0026]
The operation of the heat pump unit A and the circulation of the refrigerant are the same as in the floor heating operation, and no hot water is stored. Therefore, the second on-off valve 14 is closed, and the refrigerant flows through the primary flow path 12A of the water-refrigerant heat exchanger 12. Absent.
[0027]
The temperature of the hot water supplied to the fan coil 21 is 80 ° C., and the hot water control therefor is the same as in the case of the floor heating operation. Further, the bathroom heating control is performed by detecting the room temperature by a room temperature thermistor (not shown) mounted on the fan coil 21, controlling the fan rotation speed, and controlling the opening and closing of the thermal valve 23.
[0028]
<Simultaneous operation of floor heating and bathroom heating>
When the floor heating by the floor heating panels 1 and 2 and the room temperature air heating by the fan coil 21 are simultaneously performed, the operation switches of the remote controllers 3, 4, and 22 are turned on. Then, the thermal valves 5, 6, and 23 are opened, the circulation pump 7 is operated, and in the first hot water circulation path C1, the expansion tank 8 → the circulation pump 7 → the water flow path 9B of the first water / refrigerant heat exchanger 9 → the flow rate The hot water flows in the order of the regulating valve 20 → the heat operated valves 5 and 6 → the floor heating panels 1 and 2 → the expansion tank 8, and the expansion tank 8 → the circulation pump 7 → the water flow path 9 B of the first water / refrigerant heat exchanger 9 → the flow rate Hot water flows in the order of the regulating valve 20 → the heat operated valve 23 → the fan coil 21 → the expansion tank 8.
[0029]
The bypass pipe 10 allows a portion of the hot water to be bypassed so that it takes time for the thermal valves 5, 6, and 23 to open, and can cope with failure of the thermal valves 5, 6, and 23. And a small amount of warm water flows.
[0030]
The temperature control of the hot water by the thermistor 19 at this time is 80 ° C., but the temperature is too high for the hot water for the floor heating panels 1 and 2. In order to solve this, by opening the thermal valve 24, the intermediate temperature water from the expansion tank 8 is mixed with the 80 ° C hot water, and the temperature of the hot water detected by the thermistor 25 is controlled to be 60 to 70 ° C. are doing. When the temperature becomes low due to excessive mixing of the medium-temperature water, the thermal valve 24 is closed, and the opening and closing of the thermal valve 24 is controlled based on the temperature detected by the thermistor 25.
[0031]
The operation of the heat pump unit A and the circulation of the refrigerant are the same as those of the floor heating operation or the bathroom heating operation, and since no hot water is stored, the second on-off valve 14 is closed, and the primary refrigerant flow path 12A of the water-refrigerant heat exchanger 12 is closed. No refrigerant flows.
[0032]
<Hot water storage operation>
When storing hot water in the hot water storage tank 26, the circulation pump 27 is operated, and in the second hot water circulation path C2, the hot water storage tank 26 → the circulation pump 27 → the water flow path 12B of the second water / refrigerant heat exchanger 12 → the flow control valve 29 → Hot water for hot water supply flows in the order of the hot water storage tank 26 and is stored in the hot water storage tank 26.
[0033]
In the heat pump unit A, the compressor 11 operates and the second on-off valve 14 opens, and in the refrigerant circuit R, the compressor 11 → the primary flow path 12A of the second water-refrigerant heat exchanger 12 → the primary flow of the internal heat exchanger 15 The refrigerant flows in the order of the path 15A → the expansion valve 16 → the air heat exchanger 17 → the secondary flow path 15B of the internal heat exchanger 15 → the accumulator 18 → the compressor 11. At this time, since no heating is performed, the first on-off valve 13 is closed, and the refrigerant does not flow through the primary flow path 9A of the water-refrigerant heat exchanger 9.
[0034]
Therefore, even when hot water is stored in the hot water storage tank 26, the internal heat exchanger 15 performs heat exchange between the refrigerant flowing out of the second water-refrigerant heat exchanger 12 and the refrigerant flowing out of the air heat exchanger 17. Therefore, it is possible to cope with higher-temperature water supply, and it is possible to keep the entire hot water storage tank 26 at a higher temperature.
[0035]
Although the temperature of the hot water supplied to the hot water storage tank 26 is 90 ° C., the frequency control of the compressor 11, the valve opening control of the expansion valve 16, and the flow control valve 29 are performed so that the temperature detected by the thermistor 30 becomes this temperature. Is performed.
[0036]
The high-temperature water stored in the hot-water storage tank 26 is adjusted to an appropriate temperature by a mixing valve 36 and is used for supplying hot water from a hot-water supply pipe 35 to a kitchen or a shower, filling hot water into a bathtub 34, and the like. Then, when hot water is supplied, water is supplied from the water supply pipe 38 to the hot water storage tank 26. In addition, by operating the circulation pumps 32 and 33, the hot water in the hot water storage tank 26 and the hot water in the bathtub 34 can be heat-exchanged by the water heat exchanger 31 to reheat the hot water in the bathtub 34.
[0037]
<Simultaneous operation of heating and hot water storage>
The circulation path of the heating hot water and the circulation path of the hot water for storing hot water in this case are as described above. In the refrigerant circuit R, the first and second on-off valves 13 and 14 are both opened, and the compressor 11 → the refrigerant flow path 9A of the first water-refrigerant heat exchanger 9 and the primary flow path 12A of the second water-refrigerant heat exchanger 12 The refrigerant flows in the order of the primary flow path 15A of the internal heat exchanger 15, the expansion valve 16, the air heat exchanger 17, the secondary flow path 15B of the internal heat exchanger 15, the accumulator 18, and the compressor 11. At this time, it goes without saying that heat is exchanged in the first water-refrigerant heat exchanger 9, the second water-refrigerant heat exchanger 12, and the internal heat exchanger 15.
[0038]
Further, the frequency control of the compressor 11, the valve opening control of the expansion valve 16, and the valve opening control of the flow regulating valves 20, 29 are performed so that the thermistors 19, 25, and 30 have the above-described target temperatures, respectively. When the simultaneous operation is performed, the compressor 11 is operated at the maximum capacity, so that sufficient capacity can be obtained on the heating side and the hot water storage side.
[0039]
Although the embodiments of the present invention have been described above, various alternatives, modifications, or variations are possible for those skilled in the art based on the above description, and the various alternatives, modifications, and modifications described above may be made without departing from the spirit of the present invention. Or, it includes modifications.
[0040]
【The invention's effect】
As described above, the present invention allows hot water storage operation and hot water heating operation to be performed, and even if heat is not sufficiently released in the water refrigerant heat exchanger for hot water supply or the water refrigerant heat exchanger for heating, By providing a heat exchanger separately from the above, it is possible to lower the refrigerant temperature and to cope with various heating loads.
[Brief description of the drawings]
FIG. 1 is an overall system diagram of a heat pump hot water supply / room heating apparatus.
[Explanation of symbols]
1, 2 floor heating panel (hot water heater)
9, 12 water refrigerant heat exchanger 11 compressor 15 internal heat exchanger 16 expansion valve (decompression device)
17 Air heat exchanger 26 Hot water storage tank C1 First hot water circulation path C2 Second hot water circulation path R Refrigerant circuits S1, S2 Controller (control means)

Claims

Circulating hot water between the refrigerant circuit formed by sequentially connecting the compressor, the water-refrigerant heat exchanger, the internal heat exchanger, the pressure reducing device, and the air heat exchanger in an annular manner, and the water-refrigerant heat exchanger and the hot water storage tank; The hot water circulation path to be controlled, and the internal heat exchanger performs heat exchange between the refrigerant flowing out of the water refrigerant heat exchanger and the refrigerant flowing out of the air heat exchanger during the hot water storage operation by the hot water circulation path. A heat pump type hot water supply apparatus comprising:

A compressor, a refrigerant circuit formed by sequentially connecting a parallel circuit of a first water-refrigerant heat exchanger and a second water-refrigerant heat exchanger, an internal heat exchanger, a decompression device, and an air heat exchanger in an annular manner; A first hot water circulation path for circulating hot water between the first water refrigerant heat exchanger and the hot water heater, and a second hot water circulation path for circulating hot water between the second water refrigerant heat exchanger and the hot water storage tank And controlling the internal heat exchanger to exchange heat between the refrigerant flowing out of the first water-refrigerant heat exchanger and the refrigerant flowing out of the air heat exchanger during the hot water heating operation by the first hot water circulation path. A heat pump hot water supply / room heating device comprising:

A compressor, a refrigerant circuit formed by sequentially connecting a parallel circuit of a first water-refrigerant heat exchanger and a second water-refrigerant heat exchanger, an internal heat exchanger, a decompression device, and an air heat exchanger in an annular manner; A first hot water circulation path for circulating hot water between the first water refrigerant heat exchanger and the hot water heater, and a second hot water circulation path for circulating hot water between the second water refrigerant heat exchanger and the hot water storage tank Controlling the internal heat exchanger to perform heat exchange between the refrigerant flowing out of the second water refrigerant heat exchanger and the refrigerant flowing out of the air heat exchanger during the hot water storage operation by the second hot water circulation path. And a heat pump-type hot water supply / room heating device.

A compressor, a refrigerant circuit formed by sequentially connecting a parallel circuit of a first water-refrigerant heat exchanger and a second water-refrigerant heat exchanger, an internal heat exchanger, a decompression device, and an air heat exchanger in an annular manner; A first hot water circulation path for circulating hot water between the first water refrigerant heat exchanger and the hot water heater, and a second hot water circulation path for circulating hot water between the second water refrigerant heat exchanger and the hot water storage tank The refrigerant flowing out of the first water-refrigerant heat exchanger and the second water-refrigerant heat exchanger during the hot water heating operation by the first hot water circulation path and the hot water storage operation by the second hot water circulation path, and the air heat exchanger And a control means for controlling heat exchange with the refrigerant flowing out of the internal heat exchanger so as to perform the heat exchange.