JP4497616B2

JP4497616B2 - Air conditioner

Info

Publication number: JP4497616B2
Application number: JP2000008574A
Authority: JP
Inventors: 幸生鳶; 泰声天野; 淳山内
Original assignee: Sanyo Electric Co Ltd
Current assignee: Sanyo Electric Co Ltd
Priority date: 2000-01-18
Filing date: 2000-01-18
Publication date: 2010-07-07
Anticipated expiration: 2020-01-18
Also published as: JP2001201206A

Description

【０００１】
【発明の属する技術分野】
本発明は冷媒熱交換器を有する冷凍サイクルと、温水熱交換器を有する温水循環回路とを備えた空気調和機の制御に関する。
【０００２】
【従来の技術】
一般に、冷媒圧縮機、室外熱交換器、電動膨張弁、冷媒が供給される室内熱交換器等から構成される冷凍サイクルと、加熱器、温水熱交換器、温水制御弁、温水が供給される室内熱交換器等から構成される温水循環回路とを備え、これらにより冷房、暖房を可能にした空気調和機は知られている。室内熱交換器には冷媒管と温水管とを配設し、この室内熱交換器を冷却または加熱し、この室内熱交換器と室内空気とを熱交換させて冷却または加熱された空気を室内に吹き出して室内を空調するものである。
【０００３】
この種のものにおいて、暖房運転を、温水が供給される室内熱交換器を用いた暖房と冷媒が供給される室内熱交換器を用いた暖房とに切り替えて運転を行う構成となることが考えられ、暖房立ち上がり時や外気温が低いとき等の高負荷時には温水が供給される室内熱交換器を用いた暖房を行い、室温が安定した時や外気温が暖かいとき等の低負荷時には冷媒が供給される室内熱交換器を用いた暖房を行うことが望ましい。
【０００４】
【発明が解決しようとする課題】
ところが、温水が供給される室内熱交換器を用いた暖房と冷媒が供給される室内熱交換器を用いた暖房とを単に切り替えたのでは、切り替わるときに冷媒が供給される熱交換器と温水が供給される熱交換器との間に温度差が生じ、吹出温度に影響を与えることがある。冷媒が供給される熱交換器と温水が供給される熱交換器との一方の室内熱交換器温度が急に下がり過ぎたり、逆に室内熱交換器温度が急激に上がり過ぎてこれら２種類の熱交換器の作動が頻繁に切り替わるハンチング現象を起こしたりするという問題がある。
【０００５】
本発明は上述のような従来の問題点を解消したものであり、暖房運転の低能力要求時には、温水が供給される室内熱交換器を用いた暖房を中止し、冷媒が供給される室内熱交換器を用いた暖房に切り替えることにより省エネ運転を行うとともに、温水が供給される室内熱交換器を用いた暖房と冷媒が供給される室内熱交換器を用いた暖房とを切り替える際に室温に影響を与えずに安定して切替ができる空気調和機を提供することを目的とする。
【０００６】
【課題を解決するための手段】
上記目的を達成するために、請求項１の発明は、冷媒圧縮機、冷媒が供給される室内熱交換器等から構成される冷凍サイクルと、温水制御弁、温水が供給される室内熱交換器等から構成される温水循環回路とを備え、冷媒が供給される室内熱交換器と温水が供給される室内熱交換器とのいずれかを用いて暖房運転をする空気調和機において、冷媒が供給される室内熱交換器を用いた暖房運転と温水が供給される室内熱交換器を用いた暖房運転とを切り替える際に、冷媒が供給される室内熱交換器を用いる暖房運転及び温水が供給される室内熱交換器を用いる暖房運転の併用運転を行う制御装置を有し、この制御装置は併用運転が開始されてから、冷媒が供給される室内熱交換器の温度と温水が供給される室内熱交換器の温度とが一致した後、所定時間経過するまで継続して併用運転を行うことを特徴とする。
【００１０】
請求項２の発明は、請求項１記載の空気調和機において、温水が供給される室内熱交換器を用いて暖房運転を行っている場合、室温が設定温度より低い第５の温度に上昇したとき、前記空気調和機は運転を、冷媒が供給される室内熱交換器を用いた暖房運転に切り替え、冷媒が供給される室内熱交換器を用いた暖房運転を行っている場合、室温が第５の温度よりも低い第６の温度に低下したとき、前記空気調和機は運転を、温水が供給される室内熱交換器を用いた暖房運転に切り替えることを特徴とする。
【００１１】
【発明の実施の形態】
〔第１実施形態〕
以下、本発明の第１実施形態を図面を参照して説明する。図１は本発明の第１実施形態を示す冷媒回路図である。
【００１２】
図１において、１は室内機を、２は室外機を示し、冷媒配管によりつながれている。３は熱源機を示し、室内機１と温水配管によりつながれている。これらは空気調和機４を構成している。
【００１３】
室内機１には、室内熱交換器５が収納されており、この室内熱交換器５は、冷媒（フロン）の流れる冷媒管１６を組み込んだ冷媒が供給される室内熱交換器（以下、単に冷媒室内熱交換器５ａという）と、温水の流れる温水管２６を組み込んだ温水が供給される室内熱交換器（以下、単に温水室内熱交換器５ｂという）とにより構成されており、冷媒室内熱交換器５ａは温水室内熱交換器５ｂよりも風上に配置されている。室内機１の温水入口部の温水管２６と温水室内熱交換器５ｂとの間には流量可変弁６（温水制御弁）が設けられ、弁開度を調節することにより温水室内熱交換器５ｂに流れ込む温水の流量を調節することができる。７は送風機であり、室内機の吸込口より空気を吸い込み、この吸い込んだ空気を室内熱交換器５で加熱または冷却した後、室内に吹き出している。吸込口には室温センサ８が備えられ室温を検出している。
【００１４】
室外機２には、冷媒圧縮機１２、（冷媒用）室外熱交換器１３、四方弁１４、アキュームレータ１５などが収納され、これらは冷媒管１６により、冷媒室内熱交換器５ａ、電動膨張弁１７などとつながれ冷凍サイクル（冷媒が実線矢印の方向に循環して冷房運転を行い、点線矢印の方向に循環して暖房運転を行う）を構成している。
【００１５】
１８は制御装置であり、冷媒圧縮機１２、流量可変弁６及び室温センサ８に接続され、室温センサ８により検出された室温と設定温度との差を比較する温度比較手段を備えている。この温度比較手段に基づいて、冷媒圧縮機１２の回転数及び流量可変弁６の弁開度を制御して冷房能力及び暖房能力を制御している。
【００１６】
冷媒室内熱交換器５ａの冷房能力及び暖房能力は、冷媒圧縮機１２の回転数を変更することにより変えられる。冷媒圧縮機１２の駆動源に誘導電動機を用い、冷媒圧縮機１２へ供給する交流電力の周波数をインバータ装置を用いて変えることにより、回転数を変えることができる。
【００１７】
なお、２１はマフラであり、このマフラ２１は冷凍サイクル内を循環する冷媒の冷媒音を減らすためのものである。
【００１８】
熱源機３には加熱器２２（たとえばガスバーナ）、温水熱交換器２３、ポンプ２４、プレッシャータンク２５などが収納され、これらは室内機１に収納された温水室内熱交換器５ｂ、流量可変弁６と共に、温水配管２６で環状につながれて、暖房用の温水循環回路を構成している。
【００１９】
これによれば、加熱器２２による加熱量及び流量可変弁６による温水循環量を変えることにより、温水室内熱交換器５ｂでの放熱量を制御することができる。
【００２０】
２７はリザーブタンクであり、温水循環回路中の余剰温水を蓄え、リザーブタンク２７からあふれた分はドレンとして排水される。
【００２１】
２８は加圧注水弁、２９は加圧注水装置であり、温水循環回路に温水（水）を注水するためのものである。
【００２２】
１６ａは冷媒用のユニット間配管であり、２６ａは温水用のユニット間配管であり、それぞれ室内機１と室外機２、室内機１と熱源機３とをつないでいる。なお、加熱器２２の加熱量（燃焼量）は温水室内熱交換器５ｂに流れる温水の温度が所定値（例えば８０℃、６０℃など使用者が選択して決められる一定の温度）になるように自動制御される。
【００２３】
以上の構成において、冷媒が冷媒管１６、１６ａ内を実線矢印方向に循環しているときは冷媒圧縮機１２から吐出された冷媒が四方弁１４、室外熱交換器１３を通り電動膨張弁１７により減圧されることにより、冷媒が冷媒室内熱交換器５ａで蒸発して回りの空気を冷やすので、被調和室内は冷房される。逆に冷媒が冷媒管１６、１６ａ内を点線矢印方向に循環しているときは冷媒圧縮機１２から吐出された冷媒が四方弁１４を通って冷媒室内熱交換器５ａで放熱して回りの空気を暖めるので、被調和室内は暖房される。また温水が温水管２６、２６ａ内を循環している時は、温水室内熱交換器５ｂで空気を加熱するので、被調和室内は暖房される。
【００２４】
暖房運転時には冷媒室内熱交換器５ａを用いた暖房と温水室内熱交換器５ｂを用いた暖房とを設定温度と室温との差に応じて切り替えて運転している。設定温度と室温との差が大きいときには温水室内熱交換器５ｂを用いた暖房、設定温度と室温との差が小さいときには冷媒室内熱交換器５ａを用いた暖房をし、能力要求に応じて切り替え、室温を制御している。
【００２５】
図２は室温と設定温度との差の変化に対する冷媒圧縮機の運転／停止と温水循環の流量可変弁の開閉とを示す図である。
【００２６】
図のＡ領域において、暖房運転が開始されると、室温と設定温度との差が大きいので、温水室内熱交換器５ｂを用いた暖房運転になる。流量可変弁６が全開して温水室内熱交換器５ｂ内に温水が供給され回りの空気が加熱され室内に吹き出される。室温が上昇し、例えば、室温が設定温度より１℃低い温度Ｐ１（第１の温度）以上に上昇した時点で、冷媒圧縮機１２の運転を開始させ、加熱された冷媒が冷媒室内熱交換器５ａに供給され、冷媒室内熱交換器５ａを用いた暖房と温水室内熱交換器５ｂを用いた暖房とが併用された運転がなされる。上記のように、この状態では室温と設定温度との差が少なく、空気温度もかなり高くなっているので、流量可変弁６の弁開度が最小の位置にある。
【００２７】
このような暖房状態が続けられて、室温と設定温度とが実質的に一致した温度Ｐ４（設定温度より低く第１の温度Ｐ１より高い第４の温度）以上に上昇したとき、流量可変弁６が閉鎖して温水室内熱交換器５ｂ内への温水の供給を停止し、冷媒室内熱交換器５ａのみの暖房に切り替わる。
【００２８】
このとき室内熱交換器５の温度はＰ１時点では、温水室内熱交換器５ｂの温度が冷媒室内熱交換器５ａの温度より高くなっているが、冷媒室内熱交換器５ａを用いた暖房が開始され温水室内熱交換器５ｂを用いた暖房との併用運転がなされると、冷媒室内熱交換器５ａの温度が上昇し、しだいに冷媒室内熱交換器５ａと温水室内熱交換器５ｂとの温度差がなくなり、Ｐ４時点では、ほぼ同じ温度に保たれ、その後は冷媒熱交換器５ａのみで室内の暖房が行われるようになる。
【００２９】
このようにして、温水室内熱交換器５ｂを用いた暖房から冷媒室内熱交換器５ａを用いた暖房に切り替わるときに、暫くの間冷媒室内熱交換器５ａを用いた暖房と温水室内熱交換器５ｂを用いた暖房とを併用運転する期間を設けることにより、冷媒室内熱交換器５ａと温水室内熱交換器５ｂとが実質的に同じ温度になった後に冷媒室内熱交換器５ａの運転と切り替えられるようにすると、温水室内熱交換器５ｂを用いた暖房と冷媒室内熱交換器５ａを用いた暖房とのハンチング現象を防ぐことができる。即ち、温水室内熱交換器５ｂを用いた暖房によって室温が上昇したときに冷媒室内熱交換器５ａを用いた暖房に直ちに切り替えたときは冷媒室内熱交換器５ａを用いた加熱が不十分なために室内熱交換器５の温度が一時的に下がることになる。このときに、室内熱交換器５の運転を切り替える制御装置１８が、冷媒室内熱交換器５ａの運転に切り替わった直後に再び温水室内熱交換器５ｂの併用運転に戻り、室内熱交換器５の低下を暖房能力の不足と誤認して、室内熱交換器５の温度上昇によって、その後に再び冷媒室内熱交換器５ａの運転に切り替わり、また、併用運転に戻るというような冷媒室内熱交換器５ａまたは温水室内熱交換器５ｂのハンチング現象は、上述のような併用運転期間を設けることによって無くなり、室内熱交換器５の温度が安定した後に温水室内熱交換器５ｂを用いた暖房を停止するので、室内への吹出温度の変動を抑えることができる。また、冷媒室内熱交換器５ａを用いた暖房は、温水室内熱交換器５ｂを用いた暖房に比べて小さい暖房能力の制御に優れており、暖房負荷の小さい低能力要求時には、室内熱交換器５の運転と停止を繰り返すような運転を避け、より安定した室温に保つことができる。
【００３０】
このようにして冷媒室内熱交換器５ａ単独の暖房が続けられる。状況が変わって室内への外気導入等の影響によって、暖房負荷に暖房能力が満たなくなると、室温が次第に下がってきて冷媒室内熱交換器５ａを用いた暖房では十分な暖房ができなくなる。（Ｂ領域）
図のＢ領域において、室温が設定温度より、例えば、２℃以上下がった温度Ｐ３（第３の温度）のときには、流量可変弁６を開き、温水室内熱交換器５ｂを用いた暖房運転が開始される。冷媒室内熱交換器５ａを用いた暖房運転も行われており、冷媒室内熱交換器５ａと温水室内熱交換器５ｂを用いた併用運転が行われる。
【００３１】
この運転は単なる併用運転では暖房運転能力が不足するという予測をして温水温度に切り替えるための運転であり、流量可変弁６は閉鎖に近い状態で暖房をしているため、冷媒室内熱交換器５ａの温度は徐々に下がり室温は、Ｐ３より低い温度Ｐ２（第２の温度）に低下する。
【００３２】
室温が設定温度より３℃以上下がった時点Ｐ２（第２の温度）で、冷媒室内熱交換器５ａを用いた暖房運転が停止され、温水供給量を流量可変弁６で調整して暖房能力を制御する温水室内熱交換器５ａのみの暖房運転になる。
【００３３】
冷媒室内熱交換器５ａを用いた暖房から温水室内熱交換器５ｂを用いた暖房に切り替わるときも、上述の温水暖房から冷媒室内熱交換器５ａを用いた暖房に切り替わるときと同様に、温水室内熱交換器５ｂを用いた暖房と冷媒室内熱交換器５ａを用いた暖房とを併用運転する期間を設けている。併用運転期間を設けることにより、冷媒室内熱交換器５ａと温水室内熱交換器５ｂとが実質的に同じ温度になった後に温水室内熱交換器５ｂの運転に切り替えるので、その後に再び冷媒室内熱交換器５ａの運転に切り替わり、また、併用運転に戻るというような冷媒室内熱交換器５ａまたは温水室内熱交換器５ｂのハンチング現象が無くなり、室内熱交換器５の温度が安定するので、室内への吹出温度の変動を抑えることができる。
【００３４】
このように、冷媒室内熱交換器５ａを用いた暖房から温水室内熱交換器５ｂを用いた暖房に切り替わるとき及び温水室内熱交換器５ｂを用いた暖房から冷媒室内熱交換器５ａを用いた暖房に切り替えるときに、それぞれ併用運転する期間を設けることにより、安定した室温で切り替えが円滑に行われる。
【００３５】
また、室温と設定温度との差が大きいときには、温水室内熱交換器５ｂを用いた暖房で素早く室温を立ち上げ、室温と設定温度との差が小さくなって低能力要求時になると、小さい暖房能力の制御に優れた冷媒室内熱交換器５ａを用いた暖房を行い、安定した室温制御をすることができる。
【００３６】
さらに、温水室内熱交換器５ｂを用いた暖房をするときのガス料金に対し、冷媒室内熱交換器５ａを用いた暖房をするときの電気料金の方が安価であり、低能力要求時には、ランニングコストの安価な冷媒室内熱交換器５ａを用いた暖房を行い、経済的な暖房運転をすることができる。
【００３７】
さらにまた、家庭用エネルギを考える場合、暖房シーズンには電気の消費が少なく、ガスの消費が多いので、暖房をガスから電気に切り替えて暖房することでエネルギの平準化にも寄与することができる。
〔第２実施形態〕
以下、本発明の第２実施形態を図面を参照して説明する。図３は本発明の第２実施形態を示す冷媒回路図である。なお、図１と同一の構成要素には同一の符号を付して説明を省略し、異なる構成要素のみを説明する。
【００３８】
図３において、冷媒室内熱交換器５ａには冷媒温度センサ３３が取り付けられ、温水室内熱交換器５ｂには温水温度センサ３４が取り付けられており、それぞれ冷媒室内熱交換器５ａの温度、温水室内熱交換器５ｂの温度を検出している。
【００３９】
制御装置１８は冷媒圧縮機１２、流量可変弁６、室温センサ８、冷媒温度センサ３３及び温水温度センサ３４に接続されており、室温センサ８により検出された温度と設定温度の差を比較する温度比較手段（図示省略）を備えている。制御装置１８は、これら温度比較手段と、冷媒温度センサ３３及び温水温度センサ３４の検出温度に基づいて、冷媒圧縮機１２の回転数及び流量可変弁６の弁開度を制御して冷房能力及び暖房能力を制御している。
【００４０】
図４は暖房時の室内熱交換器の温度と設定温度との差の変化に対する冷媒圧縮機の運転／停止と流量可変弁の開閉とを示す図である。
【００４１】
図のＡ領域において、暖房運転が開始されると、室温と設定温度との差が大きいので、温水室内熱交換器５ｂを用いた暖房運転が行われる。流量可変弁６が全開して温水室内熱交換器５ｂ内に温水が供給され回りの空気が加熱され、加熱された空気が室内に吹き出される。室温が上昇し、室温が設定温度より１℃程度低い温度Ｐ５（第５の温度）に上昇した時点で、冷媒圧縮機１２を運転させ、冷媒室内熱交換器５ａを用いた暖房と温水室内熱交換器５ｂを用いた暖房とが併用運転される。このとき温水循環回路の流量可変弁６の弁開度が最小の位置にあり、冷媒室内熱交換器５ａの温度は、温水室内熱交換器５ｂの温度と同じ温度になる。温水室内熱交換器５ｂの温度と冷媒室内熱交換器５ａの温度とが一致（Ｑ１）した後、所定時間経過するまで（例えば１分）継続して併用運転を行う。その後、流量可変弁６を閉鎖して温水室内熱交換器５ｂ内への温水の供給を停止させる。これにより、冷媒室内熱交換器５ａを用いた暖房のみの運転に切り替わる。
【００４２】
このようにして、温水室内熱交換器５ｂを用いた暖房から冷媒室内熱交換器５ａを用いた暖房に切り替わるときに、暫くの間冷媒室内熱交換器５ａを用いた暖房と温水室内熱交換器５ｂを用いた暖房とを併用運転する期間を設けることにより、冷媒室内熱交換器５ａと温水室内熱交換器５ｂとが実質的に同じ温度になった後に冷媒室内熱交換器５ａの運転と切り替えるので、室内熱交換器５の運転を切り替える制御装置１８が冷媒室内熱交換器５ａの運転に切り替わった直後に再び温水室内熱交換器５ｂの併用運転を行い、その後に再び冷媒室内熱交換器５ａの運転に切り替わり、また、併用運転に戻るというような冷媒室内熱交換器５ａまたは温水室内熱交換器５ｂのハンチング現象が無くなり、室内熱交換器５の温度が安定するので、室内への吹出温度の変動を抑えることができる。
【００４３】
図のＢ領域において、冷媒室内熱交換器５ａを用いた暖房が行われている場合、室内への外気導入等の影響によって室温が下がったとき、例えば、室温が設定温度より２℃以上低い温度Ｐ６（第６の温度）に低下したときには、流量可変弁６を開いて温水室内熱交換器５ｂを用いた暖房運転が開始される。冷媒室内熱交換器５ａを用いた暖房運転も行われており、冷媒室内熱交換器５ａと温水室内熱交換器５ｂを用いた併用運転が行われる。一時的な暖房負荷の増大であれば、暫く後に室温が設定温度に近づき、再び冷媒室内熱交換器５ａを用いた単独運転に戻るが、流量可変弁６を絞った状態での併用運転では暖房運転能力が不足し、室内熱交換器５の温度は徐々に下がり続ける。
【００４４】
しかし、一定時間以上温水室内熱交換器５ｂに温水が循環されると温水室内熱交換器５ｂの温度が上昇して温水室内熱交換器５ｂの温度と冷媒室内熱交換器５ａの温度とが一致（Ｑ２）した後、所定時間経過するまで（例えば１分）継続して併用運転を行う。その後、冷媒圧縮機１２の運転が停止され、冷媒室内熱交換器５ａを用いた暖房運転が停止される。これにより、温水室内熱交換器５ｂを用いた暖房のみの運転に切り替わり、温水室内熱交換器５ｂの暖房能力は、流量可変弁６の弁開度で制御される。
【００４５】
この場合も第１実施形態と同様に冷媒室内熱交換器５ａを用いた暖房から温水室内熱交換器５ｂを用いた暖房に切り替わるときに、温水室内熱交換器５ｂを用いた暖房と冷媒室内熱交換器５ａを用いた暖房とを併用運転する期間を設けることにより、冷媒室内熱交換器５ａと温水室内熱交換器５ｂとが実質的に同じ温度になった後に温水室内熱交換器５ｂの運転に切り替えるので、その後に再び冷媒室内熱交換器５ａの運転に切り替わり、また、併用運転に戻るというような冷媒室内熱交換器５ａまたは温水室内熱交換器５ｂのハンチング現象が無くなり、室内熱交換器５の温度が安定するので、室内への吹出温度の変動を抑えることができる。
【００４６】
このように、冷媒室内熱交換器５ａを用いた暖房から温水室内熱交換器５ｂを用いた暖房に切り替わるとき及び温水室内熱交換器５ｂを用いた暖房から冷媒室内熱交換器５ａを用いた暖房に切り替えるときに、それぞれ併用運転する期間を設けることにより、安定した室温で切り替えが円滑に行われる。
【００４７】
また、室温と設定温度との差が大きいときには、温水室内熱交換器５ｂを用いた暖房で素早く室温を立ち上げ、室温と設定温度との差が小さくなって低能力要求時になると、小さい暖房能力の制御に優れた冷媒室内熱交換器５ａを用いた暖房を行い、安定した室温制御をすることができる。
【００４８】
さらに、温水室内熱交換器５ｂを用いた暖房をするときのガス料金に対し、冷媒室内熱交換器５ａを用いた暖房をするときの電気料金の方が安価であり、低能力要求時には、ランニングコストの安価な冷媒室内熱交換器５ａを用いた暖房を行い、経済的な暖房運転をすることができる。
〔第３実施形態〕
図５は第３実施形態の空気調和機を示す冷媒回路図である。なお、図１と同一の構成要素には同一の符号を付してその説明を省略する。
【００４９】
室外機２及び熱源機３はマルチタイプのものであり、室外機２及び熱源機３には２台の室内機１Ａ、１Ｂがそれぞれ冷媒用のユニット間配管１６ａ、温水用のユニット間配管２６ａによりつながれて、マルチタイプの空気調和機を構成している。
【００５０】
マルチタイプの空気調和機では、例えば、一方の室内機１Ａをリビング等の空調用に、他方の室内機１Ｂを廊下、トイレ、浴室またはユーティリティ等の空調に使用する場合などがあり、このような室内機１Ａ、１Ｂにおいても図１や図３と同様な冷媒室内熱交換器５ａと温水室内熱交換器５ｂとが設けられ、第１実施形態や第２実施形態と同様な併用運転期間を設けた切替制御が行われる。
【００５１】
マルチタイプの空気調和機の一方の室内機、例えば、室内機１Ｂが低暖房能力で、長時間空気調和機４を運転するようなトイレ、浴室またはユーティリティ等に設置される場合には、殆どの時間をランニングコストの安価な冷媒室内熱交換器５ａを用いた暖房運転とすることができ、これによって経済的で室温が安定した空調をすることができる。
【００５２】
以上、それぞれの実施形態に基づいて本発明を説明したが、本発明はこれに限定されるものではない。本実施形態では家庭用の空気調和機で説明しているが、業務用の空気調和機においても使用できるものである。
【００５３】
【発明の効果】
以上説明したように、本発明によれば、室温と設定温度との差が大きいときには、温水が供給される室内熱交換器を用いた暖房を行い、室温と設定温度との差が小さく低能力要求時には、小さい暖房能力の制御に優れた冷媒が供給される室内熱交換器を用いた暖房に切り替えることにより省エネを考えた暖房運転ができる。しかも温水が供給される室内熱交換器を用いた暖房と冷媒が供給される室内熱交換器を用いた暖房とを切り替えるときには、温水が供給される室内熱交換器を用いた暖房と冷媒が供給される室内熱交換器を用いた暖房との併用運転期間を設けることにより、室内熱交換器温度を安定させ、室温変動の少ない制御をすることができる。また、室温が安定しているときや低能力要求時には、ランニングコストの安価な冷媒が供給される室内熱交換器を用いた暖房を行って経済的な暖房運転をすることができる。
【図面の簡単な説明】
【図１】本発明の第１実施形態を示す冷媒回路図である。
【図２】本発明の第１実施形態における室温と設定温度との差の変化に対する冷媒圧縮機の運転／停止と温水循環回路の流量可変弁の開閉とを示す図である。
【図３】本発明の第２実施形態を示す冷媒回路図である。
【図４】本発明の第２実施形態における室内熱交換器の温度と設定温度との差の変化に対する冷媒圧縮機の運転／停止と流量可変弁の開閉とを示す図である。
【図５】本発明の第３実施形態を示す冷媒回路図である。
【符号の説明】
１、１Ａ、１Ｂ室内機
２室外機
３熱源機
４空気調和機
５室内熱交換器
５ａ冷媒が供給される室内熱交換器
５ｂ温水が供給される室内熱交換器
６流量可変弁（温水制御弁）
８室温センサ
１２冷媒圧縮機
１３室外熱交換器
１４四方弁
１６冷媒管
１６ａ冷媒用のユニット間配管
１７電動膨張弁
１８制御装置
２２加熱器
２３温水熱交換器
２６温水管
２６ａ温水用のユニット間配管
３３冷媒温度センサ（冷媒温度検出手段）
３４温水温度センサ（温水温度検出手段）
Ｐ１第１の温度（冷媒圧縮機運転開始時の温度）
Ｐ２第２の温度（冷媒圧縮機運転停止時の温度）
Ｐ３第３の温度（流量可変弁開放時の温度）
Ｐ４第４の温度（流量可変弁閉鎖時の温度）
Ｐ５第５の温度
Ｐ６第６の温度
Ｑ１、Ｑ２冷媒温度センサと温水温度センサの検出温度一致点[0001]
BACKGROUND OF THE INVENTION
The present invention relates to control of an air conditioner including a refrigeration cycle having a refrigerant heat exchanger and a hot water circulation circuit having a hot water heat exchanger.
[0002]
[Prior art]
In general, a refrigeration cycle including a refrigerant compressor, an outdoor heat exchanger, an electric expansion valve, an indoor heat exchanger to which refrigerant is supplied, a heater, a hot water heat exchanger, a hot water control valve, and hot water are supplied. 2. Description of the Related Art An air conditioner that includes a hot water circulation circuit including an indoor heat exchanger and the like and enables cooling and heating by these circuits is known. The indoor heat exchanger is provided with a refrigerant pipe and a hot water pipe, the indoor heat exchanger is cooled or heated, and the indoor heat exchanger and the indoor air are subjected to heat exchange so that the cooled or heated air is transferred to the indoor heat exchanger. The air is blown out to air-condition the room.
[0003]
In this kind of thing, it is considered that the heating operation is switched to heating using an indoor heat exchanger supplied with hot water and heating using an indoor heat exchanger supplied with refrigerant. Heating is performed using an indoor heat exchanger to which hot water is supplied at the time of high load such as when the heater starts up or when the outside temperature is low, and when the load is low such as when the room temperature is stable or the outside temperature is warm, the refrigerant is It is desirable to perform heating using the supplied indoor heat exchanger.
[0004]
[Problems to be solved by the invention]
However, simply switching between heating using an indoor heat exchanger supplied with hot water and heating using an indoor heat exchanger supplied with refrigerant, the heat exchanger and hot water supplied with refrigerant when switching A temperature difference may occur between the heat exchanger and the heat exchanger, and the blowout temperature may be affected. The temperature of one indoor heat exchanger of the heat exchanger supplied with the refrigerant and the heat exchanger supplied with hot water falls too rapidly, or conversely, the temperature of the indoor heat exchanger rises too rapidly. There is a problem of causing a hunting phenomenon in which the operation of the heat exchanger is frequently switched.
[0005]
The present invention solves the above-described conventional problems, and when low capacity is required for heating operation, heating using an indoor heat exchanger to which hot water is supplied is stopped and indoor heat to which refrigerant is supplied is provided. When switching between heating using an indoor heat exchanger to which hot water is supplied and heating using an indoor heat exchanger to which refrigerant is supplied, the energy saving operation is performed by switching to heating using an exchanger. An object of the present invention is to provide an air conditioner that can be switched stably without affecting.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, a first aspect of the present invention is a refrigeration cycle including a refrigerant compressor, an indoor heat exchanger supplied with refrigerant, a hot water control valve, and an indoor heat exchanger supplied with hot water. In an air conditioner that performs a heating operation using either an indoor heat exchanger supplied with refrigerant or an indoor heat exchanger supplied with hot water. When the heating operation using the indoor heat exchanger and the heating operation using the indoor heat exchanger to which hot water is supplied are switched, the heating operation and hot water using the indoor heat exchanger to which the refrigerant is supplied are supplied. that used the indoor heat exchanger have a controller for combined operation of the heating operation, this control system is started combined operation, room temperature and hot water of the indoor heat exchanger refrigerant is supplied is supplied After the heat exchanger temperature matches, And performing combined operation continues until after a constant time.
[0010]
According to a second aspect of the present invention, in the air conditioner according to the first aspect , when the heating operation is performed using the indoor heat exchanger to which hot water is supplied, the room temperature rises to a fifth temperature lower than the set temperature. When the air conditioner switches the operation to the heating operation using the indoor heat exchanger to which the refrigerant is supplied and performs the heating operation using the indoor heat exchanger to which the refrigerant is supplied, When the temperature falls to a sixth temperature lower than 5, the air conditioner switches the operation to a heating operation using an indoor heat exchanger to which hot water is supplied.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
[First Embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a refrigerant circuit diagram showing a first embodiment of the present invention.
[0012]
In FIG. 1, 1 indicates an indoor unit and 2 indicates an outdoor unit, which are connected by refrigerant piping. Reference numeral 3 denotes a heat source unit, which is connected to the indoor unit 1 by hot water piping. These constitute the air conditioner 4.
[0013]
An indoor heat exchanger 5 is accommodated in the indoor unit 1, and this indoor heat exchanger 5 is simply an indoor heat exchanger (hereinafter simply referred to as refrigerant) incorporating a refrigerant pipe 16 through which refrigerant (fluorocarbon) flows. Refrigerant indoor heat exchanger 5a), and an indoor heat exchanger (hereinafter simply referred to as hot water indoor heat exchanger 5b) to which hot water incorporating hot water pipe 26 in which hot water flows is supplied. The exchanger 5a is arranged on the windward side of the hot water indoor heat exchanger 5b. A variable flow valve 6 (warm water control valve) is provided between the warm water pipe 26 at the warm water inlet of the indoor unit 1 and the warm water indoor heat exchanger 5b, and the warm water indoor heat exchanger 5b is adjusted by adjusting the valve opening. The flow rate of hot water flowing into the can be adjusted. Reference numeral 7 denotes a blower that sucks air from a suction port of the indoor unit and heats or cools the sucked air by the indoor heat exchanger 5 and then blows it out into the room. A room temperature sensor 8 is provided at the suction port to detect the room temperature.
[0014]
The outdoor unit 2 accommodates a refrigerant compressor 12, an outdoor heat exchanger 13 (for refrigerant), a four-way valve 14, an accumulator 15, and the like. These are connected to the refrigerant indoor heat exchanger 5a and the electric expansion valve 17 by a refrigerant pipe 16. Are connected to the refrigeration cycle (cooling operation is performed by circulating the refrigerant in the direction of the solid arrow, and heating operation is performed by circulating in the direction of the dotted arrow).
[0015]
A control device 18 is connected to the refrigerant compressor 12, the flow rate variable valve 6, and the room temperature sensor 8 and includes temperature comparison means for comparing the difference between the room temperature detected by the room temperature sensor 8 and the set temperature. Based on this temperature comparison means, the cooling capacity and the heating capacity are controlled by controlling the rotational speed of the refrigerant compressor 12 and the valve opening degree of the flow variable valve 6.
[0016]
The cooling capacity and the heating capacity of the refrigerant indoor heat exchanger 5a can be changed by changing the rotation speed of the refrigerant compressor 12. By using an induction motor as a drive source of the refrigerant compressor 12 and changing the frequency of the AC power supplied to the refrigerant compressor 12 using an inverter device, the rotation speed can be changed.
[0017]
In addition, 21 is a muffler, and this muffler 21 is for reducing the refrigerant | coolant sound of the refrigerant | coolant which circulates in the refrigerating cycle.
[0018]
The heat source unit 3 stores a heater 22 (for example, a gas burner), a hot water heat exchanger 23, a pump 24, a pressure tank 25, and the like. These are a hot water indoor heat exchanger 5b and a flow rate variable valve 6 stored in the indoor unit 1. At the same time, the hot water pipe 26 is connected in a ring shape to constitute a warm water circulation circuit for heating.
[0019]
According to this, by changing the heating amount by the heater 22 and the hot water circulation amount by the flow rate variable valve 6, the heat radiation amount in the hot water indoor heat exchanger 5b can be controlled.
[0020]
Reference numeral 27 denotes a reserve tank, which stores excess hot water in the hot water circulation circuit, and a portion overflowing from the reserve tank 27 is drained as a drain.
[0021]
28 is a pressurized water injection valve, and 29 is a pressurized water injection device for injecting hot water (water) into the hot water circulation circuit.
[0022]
Reference numeral 16a denotes a refrigerant inter-unit pipe, and reference numeral 26a denotes a hot water inter-unit pipe, which connects the indoor unit 1 and the outdoor unit 2, and the indoor unit 1 and the heat source unit 3, respectively. The heating amount (combustion amount) of the heater 22 is such that the temperature of the hot water flowing in the hot water indoor heat exchanger 5b becomes a predetermined value (for example, a constant temperature determined by the user, such as 80 ° C. or 60 ° C.). Automatically controlled.
[0023]
In the above configuration, when the refrigerant circulates in the refrigerant pipes 16 and 16 a in the direction of the solid arrow, the refrigerant discharged from the refrigerant compressor 12 passes through the four-way valve 14 and the outdoor heat exchanger 13 and is driven by the electric expansion valve 17. By reducing the pressure, the refrigerant evaporates in the refrigerant indoor heat exchanger 5a and cools the surrounding air, so that the conditioned room is cooled. Conversely, when the refrigerant circulates in the refrigerant pipes 16 and 16a in the direction of the dotted arrow, the refrigerant discharged from the refrigerant compressor 12 passes through the four-way valve 14 and dissipates heat in the refrigerant indoor heat exchanger 5a, and the surrounding air The room to be conditioned is heated. When hot water is circulating in the hot water pipes 26 and 26a, the air is heated by the hot water indoor heat exchanger 5b, so that the conditioned room is heated.
[0024]
During the heating operation, the heating using the refrigerant indoor heat exchanger 5a and the heating using the hot water indoor heat exchanger 5b are switched according to the difference between the set temperature and the room temperature. When the difference between the set temperature and room temperature is large, heating is performed using the hot water indoor heat exchanger 5b, and when the difference between the set temperature and room temperature is small, heating is performed using the refrigerant indoor heat exchanger 5a, and switching is performed according to the capacity requirement. Control the room temperature.
[0025]
FIG. 2 is a diagram showing operation / stop of the refrigerant compressor and opening / closing of the variable flow valve for hot water circulation in response to a change in the difference between the room temperature and the set temperature.
[0026]
In the area A in the figure, when the heating operation is started, since the difference between the room temperature and the set temperature is large, the heating operation using the hot water indoor heat exchanger 5b is performed. The flow rate variable valve 6 is fully opened, hot water is supplied into the hot water indoor heat exchanger 5b, and the surrounding air is heated and blown into the room. When the room temperature rises, for example, when the room temperature rises to a temperature P1 (first temperature) that is 1 ° C. lower than the set temperature, the operation of the refrigerant compressor 12 is started, and the heated refrigerant becomes a refrigerant indoor heat exchanger. The operation using the heating using the refrigerant indoor heat exchanger 5a and the heating using the hot water indoor heat exchanger 5b is performed. As described above, in this state, the difference between the room temperature and the set temperature is small and the air temperature is considerably high, so that the valve opening degree of the variable flow valve 6 is at the minimum position.
[0027]
When such a heating state is continued and the temperature rises to a temperature P4 (fourth temperature lower than the set temperature and higher than the first temperature P1) at which the room temperature and the set temperature substantially coincide with each other, the variable flow valve 6 Is closed, the supply of hot water into the hot water indoor heat exchanger 5b is stopped, and the heating is switched to heating only the refrigerant indoor heat exchanger 5a.
[0028]
At this time, the temperature of the indoor heat exchanger 5 is higher than the temperature of the refrigerant indoor heat exchanger 5a at the time P1, but heating using the refrigerant indoor heat exchanger 5a is started. When the combined operation with heating using the hot water indoor heat exchanger 5b is performed, the temperature of the refrigerant indoor heat exchanger 5a rises, and gradually the temperatures of the refrigerant indoor heat exchanger 5a and the hot water indoor heat exchanger 5b are increased. The difference disappears, and at P4, the temperature is kept substantially the same, and thereafter the room is heated only by the refrigerant heat exchanger 5a.
[0029]
Thus, when switching from the heating using the hot water indoor heat exchanger 5b to the heating using the refrigerant indoor heat exchanger 5a, the heating using the refrigerant indoor heat exchanger 5a and the hot water indoor heat exchanger for a while. By providing a period for combined use with heating using 5b, the refrigerant indoor heat exchanger 5a and the hot water indoor heat exchanger 5b are switched to the operation of the refrigerant indoor heat exchanger 5a after the temperature becomes substantially the same. By doing so, it is possible to prevent the hunting phenomenon between the heating using the hot water indoor heat exchanger 5b and the heating using the refrigerant indoor heat exchanger 5a. That is, when the room temperature rises due to the heating using the hot water indoor heat exchanger 5b, the heating using the refrigerant indoor heat exchanger 5a is insufficient when the room temperature is immediately switched to the heating using the refrigerant indoor heat exchanger 5a. Therefore, the temperature of the indoor heat exchanger 5 is temporarily lowered. At this time, the controller 18 that switches the operation of the indoor heat exchanger 5 returns to the combined operation of the hot water indoor heat exchanger 5b immediately after switching to the operation of the refrigerant indoor heat exchanger 5a. The refrigerant indoor heat exchanger 5a in which the decrease is mistaken as a lack of heating capacity and the operation is switched to the operation of the refrigerant indoor heat exchanger 5a again due to the temperature increase of the indoor heat exchanger 5 and the combined operation is resumed. Alternatively, the hunting phenomenon of the hot water indoor heat exchanger 5b is eliminated by providing the above-described combined operation period, and heating using the hot water indoor heat exchanger 5b is stopped after the temperature of the indoor heat exchanger 5 is stabilized. , Fluctuations in the temperature of air blown into the room can be suppressed. Heating using the refrigerant indoor heat exchanger 5a is superior to heating using the hot water indoor heat exchanger 5b in controlling the small heating capacity. When the heating capacity is low and the low capacity is required, the indoor heat exchanger is heated. The operation which repeats the operation of 5 and the stop can be avoided and the room temperature can be kept more stable.
[0030]
In this way, heating of the refrigerant indoor heat exchanger 5a alone is continued. If the situation changes and the heating capacity does not satisfy the heating load due to the influence of the introduction of outside air into the room, the room temperature gradually decreases, and heating using the refrigerant indoor heat exchanger 5a cannot be performed sufficiently. (B area)
In the region B in the figure, when the room temperature is a temperature P3 (third temperature) lower than the set temperature by 2 ° C. or more, for example, the flow variable valve 6 is opened and heating operation using the hot water indoor heat exchanger 5b is started. Is done. The heating operation using the refrigerant indoor heat exchanger 5a is also performed, and the combined operation using the refrigerant indoor heat exchanger 5a and the hot water indoor heat exchanger 5b is performed.
[0031]
This operation is an operation for predicting that the heating operation capacity is insufficient in the simple combined operation and switching to the hot water temperature, and since the flow rate variable valve 6 is heating in a state close to closing, the refrigerant indoor heat exchanger The temperature of 5a gradually decreases, and the room temperature decreases to a temperature P2 (second temperature) lower than P3.
[0032]
At the time point P2 (second temperature) when the room temperature falls by 3 ° C. or more from the set temperature, the heating operation using the refrigerant indoor heat exchanger 5a is stopped, and the heating capacity is adjusted by adjusting the hot water supply amount with the variable flow valve 6. Only the hot water indoor heat exchanger 5a to be controlled is in the heating operation.
[0033]
When switching from heating using the refrigerant indoor heat exchanger 5a to heating using the hot water indoor heat exchanger 5b, as in the case of switching from the above hot water heating to heating using the refrigerant indoor heat exchanger 5a, There is a period in which heating using the heat exchanger 5b and heating using the refrigerant indoor heat exchanger 5a are used in combination. By providing the combined operation period, the refrigerant indoor heat exchanger 5a and the hot water indoor heat exchanger 5b are switched to the operation of the hot water indoor heat exchanger 5b after reaching substantially the same temperature. The hunting phenomenon of the refrigerant indoor heat exchanger 5a or the hot water indoor heat exchanger 5b such as switching to the operation of the exchanger 5a and returning to the combined operation is eliminated, and the temperature of the indoor heat exchanger 5 is stabilized. The fluctuation of the blowing temperature can be suppressed.
[0034]
Thus, when switching from heating using the refrigerant indoor heat exchanger 5a to heating using the hot water indoor heat exchanger 5b and heating using the hot water indoor heat exchanger 5b, heating using the refrigerant indoor heat exchanger 5a. When switching to, switching is performed smoothly at a stable room temperature by providing a period for combined operation.
[0035]
Further, when the difference between the room temperature and the set temperature is large, the room temperature is quickly raised by heating using the hot water indoor heat exchanger 5b, and when the difference between the room temperature and the set temperature becomes small and the low capacity is required, the small heating capacity Heating is performed using the refrigerant indoor heat exchanger 5a which is excellent in controlling the temperature, and stable room temperature control can be performed.
[0036]
Furthermore, the electricity charge for heating using the refrigerant indoor heat exchanger 5a is lower than the gas charge for heating using the hot water indoor heat exchanger 5b, and running is required when low capacity is required. Heating using the low-cost refrigerant indoor heat exchanger 5a can be performed, and an economical heating operation can be performed.
[0037]
Furthermore, when considering household energy, since the consumption of electricity is small and the consumption of gas is large in the heating season, it is possible to contribute to energy leveling by switching the heating from gas to electricity. .
[Second Embodiment]
Hereinafter, a second embodiment of the present invention will be described with reference to the drawings. FIG. 3 is a refrigerant circuit diagram showing a second embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the component same as FIG. 1, description is abbreviate | omitted, and only a different component is demonstrated.
[0038]
In FIG. 3, a refrigerant temperature sensor 33 is attached to the refrigerant indoor heat exchanger 5a, and a hot water temperature sensor 34 is attached to the hot water indoor heat exchanger 5b. The temperature of the refrigerant indoor heat exchanger 5a and the hot water indoor respectively. The temperature of the heat exchanger 5b is detected.
[0039]
The control device 18 is connected to the refrigerant compressor 12, the flow rate variable valve 6, the room temperature sensor 8, the refrigerant temperature sensor 33, and the hot water temperature sensor 34, and compares the temperature detected by the room temperature sensor 8 with the set temperature. Comparing means (not shown) is provided. The control device 18 controls the cooling capacity and the rotation speed of the refrigerant compressor 12 and the valve opening degree of the flow rate variable valve 6 based on the temperature comparison means and the detected temperatures of the refrigerant temperature sensor 33 and the hot water temperature sensor 34. The heating capacity is controlled.
[0040]
FIG. 4 is a diagram illustrating operation / stop of the refrigerant compressor and opening / closing of the variable flow valve with respect to a change in the difference between the temperature of the indoor heat exchanger and the set temperature during heating.
[0041]
In the area A in the figure, when the heating operation is started, since the difference between the room temperature and the set temperature is large, the heating operation using the hot water indoor heat exchanger 5b is performed. The variable flow valve 6 is fully opened, hot water is supplied into the hot water indoor heat exchanger 5b, the surrounding air is heated, and the heated air is blown into the room. When the room temperature rises and the room temperature rises to a temperature P5 (fifth temperature) that is about 1 ° C. lower than the set temperature, the refrigerant compressor 12 is operated and heating using the refrigerant indoor heat exchanger 5a and hot water indoor heat are performed. The heating using the exchanger 5b is used in combination. At this time, the valve opening degree of the flow rate variable valve 6 of the hot water circulation circuit is at the minimum position, and the temperature of the refrigerant indoor heat exchanger 5a is the same as the temperature of the hot water indoor heat exchanger 5b. After the temperature of the hot water indoor heat exchanger 5b and the temperature of the refrigerant indoor heat exchanger 5a coincide (Q1), the combined operation is continued until a predetermined time elapses (for example, 1 minute). Thereafter, the flow rate variable valve 6 is closed to stop the supply of hot water into the hot water indoor heat exchanger 5b. Thereby, it switches to the operation | movement only of the heating using the refrigerant | coolant indoor heat exchanger 5a.
[0042]
Thus, when switching from the heating using the hot water indoor heat exchanger 5b to the heating using the refrigerant indoor heat exchanger 5a, the heating using the refrigerant indoor heat exchanger 5a and the hot water indoor heat exchanger for a while. By providing a period for combined use with heating using 5b, the refrigerant indoor heat exchanger 5a and the hot water indoor heat exchanger 5b are switched to the operation of the refrigerant indoor heat exchanger 5a after the temperature becomes substantially the same. Therefore, immediately after the controller 18 that switches the operation of the indoor heat exchanger 5 switches to the operation of the refrigerant indoor heat exchanger 5a, the combined operation of the hot water indoor heat exchanger 5b is performed again, and then the refrigerant indoor heat exchanger 5a again. Since the hunting phenomenon of the refrigerant indoor heat exchanger 5a or the hot water indoor heat exchanger 5b such as switching back to the operation of the combined operation is eliminated and the temperature of the indoor heat exchanger 5 is stabilized, It is possible to suppress the fluctuation of the temperature of air blown to.
[0043]
In the region B in the figure, when heating using the refrigerant indoor heat exchanger 5a is performed, when the room temperature is lowered due to the introduction of outside air into the room, for example, the room temperature is 2 ° C. lower than the set temperature. When the temperature drops to P6 (sixth temperature), the variable flow valve 6 is opened and the heating operation using the hot water indoor heat exchanger 5b is started. The heating operation using the refrigerant indoor heat exchanger 5a is also performed, and the combined operation using the refrigerant indoor heat exchanger 5a and the hot water indoor heat exchanger 5b is performed. If the heating load is temporarily increased, the room temperature approaches the set temperature after a while and the operation returns to the single operation using the refrigerant indoor heat exchanger 5a again. However, in the combined operation with the flow rate variable valve 6 being throttled, the heating is performed. The operating capacity is insufficient, and the temperature of the indoor heat exchanger 5 continues to gradually decrease.
[0044]
However, if hot water is circulated through the hot water indoor heat exchanger 5b for a certain time or more, the temperature of the hot water indoor heat exchanger 5b rises and the temperature of the hot water indoor heat exchanger 5b and the temperature of the refrigerant indoor heat exchanger 5a coincide. After (Q2), the combined operation is continued until a predetermined time elapses (for example, 1 minute). Thereafter, the operation of the refrigerant compressor 12 is stopped, and the heating operation using the refrigerant indoor heat exchanger 5a is stopped. Thereby, the operation is switched to only heating using the hot water indoor heat exchanger 5 b, and the heating capacity of the hot water indoor heat exchanger 5 b is controlled by the valve opening degree of the flow rate variable valve 6.
[0045]
Also in this case, similarly to the first embodiment, when switching from heating using the refrigerant indoor heat exchanger 5a to heating using the hot water indoor heat exchanger 5b, heating using the hot water indoor heat exchanger 5b and refrigerant indoor heat are performed. By providing a period during which the heating using the exchanger 5a is used in combination, the operation of the hot water indoor heat exchanger 5b is performed after the refrigerant indoor heat exchanger 5a and the hot water indoor heat exchanger 5b reach substantially the same temperature. Therefore, the hunting phenomenon of the refrigerant indoor heat exchanger 5a or the hot water indoor heat exchanger 5b, such as switching to the operation of the refrigerant indoor heat exchanger 5a again thereafter, and returning to the combined operation is eliminated, and the indoor heat exchanger Since the temperature of 5 is stabilized, the fluctuation | variation of the blowing temperature to a room | chamber interior can be suppressed.
[0046]
Thus, when switching from heating using the refrigerant indoor heat exchanger 5a to heating using the hot water indoor heat exchanger 5b and heating using the hot water indoor heat exchanger 5b, heating using the refrigerant indoor heat exchanger 5a When switching to, switching is performed smoothly at a stable room temperature by providing a period for combined operation.
[0047]
Further, when the difference between the room temperature and the set temperature is large, the room temperature is quickly raised by heating using the hot water indoor heat exchanger 5b, and when the difference between the room temperature and the set temperature becomes small and the low capacity is required, the small heating capacity Heating is performed using the refrigerant indoor heat exchanger 5a which is excellent in controlling the temperature, and stable room temperature control can be performed.
[0048]
Furthermore, the electricity charge for heating using the refrigerant indoor heat exchanger 5a is lower than the gas charge for heating using the hot water indoor heat exchanger 5b, and running is required when low capacity is required. Heating using the low-cost refrigerant indoor heat exchanger 5a can be performed, and an economical heating operation can be performed.
[Third Embodiment]
FIG. 5 is a refrigerant circuit diagram showing the air conditioner of the third embodiment. The same components as those in FIG. 1 are denoted by the same reference numerals, and the description thereof is omitted.
[0049]
The outdoor unit 2 and the heat source unit 3 are multi-type. In the outdoor unit 2 and the heat source unit 3, two indoor units 1A and 1B are respectively connected by a refrigerant inter-unit pipe 16a and a hot water inter-unit pipe 26a. Connected to form a multi-type air conditioner.
[0050]
In a multi-type air conditioner, for example, one indoor unit 1A may be used for air conditioning such as a living room, and the other indoor unit 1B may be used for air conditioning such as a corridor, toilet, bathroom, or utility. Also in the indoor units 1A and 1B, the refrigerant indoor heat exchanger 5a and the hot water indoor heat exchanger 5b similar to those in FIGS. 1 and 3 are provided, and a combined operation period similar to that in the first embodiment and the second embodiment is provided. Switching control is performed.
[0051]
When one indoor unit of a multi-type air conditioner, for example, the indoor unit 1B is installed in a toilet, a bathroom, or a utility that has a low heating capacity and operates the air conditioner 4 for a long time, Time can be set to the heating operation using the refrigerant indoor heat exchanger 5a with a low running cost, and thereby air conditioning can be performed economically and at a stable room temperature.
[0052]
As mentioned above, although this invention was demonstrated based on each embodiment, this invention is not limited to this. Although this embodiment has been described with a home air conditioner, it can also be used in a commercial air conditioner.
[0053]
【The invention's effect】
As described above, according to the present invention, when the difference between the room temperature and the set temperature is large, heating is performed using the indoor heat exchanger to which hot water is supplied, and the difference between the room temperature and the set temperature is small and the capacity is low. At the time of request, heating operation considering energy saving can be performed by switching to heating using an indoor heat exchanger to which a refrigerant excellent in control of small heating capacity is supplied. Moreover, when switching between heating using an indoor heat exchanger to which hot water is supplied and heating using an indoor heat exchanger to which refrigerant is supplied, heating and refrigerant are supplied using the indoor heat exchanger to which hot water is supplied. By providing a combined operation period with heating using the indoor heat exchanger, the temperature of the indoor heat exchanger can be stabilized and control with little room temperature fluctuation can be performed. In addition, when the room temperature is stable or when a low capacity is required, it is possible to perform an economical heating operation by performing heating using an indoor heat exchanger to which a low-cost refrigerant is supplied.
[Brief description of the drawings]
FIG. 1 is a refrigerant circuit diagram showing a first embodiment of the present invention.
FIG. 2 is a diagram showing operation / stop of a refrigerant compressor and opening / closing of a flow rate variable valve of a hot water circulation circuit with respect to a change in a difference between room temperature and a set temperature in the first embodiment of the present invention.
FIG. 3 is a refrigerant circuit diagram showing a second embodiment of the present invention.
FIG. 4 is a diagram showing operation / stop of a refrigerant compressor and opening / closing of a variable flow valve with respect to a change in the difference between the temperature of the indoor heat exchanger and the set temperature in the second embodiment of the present invention.
FIG. 5 is a refrigerant circuit diagram showing a third embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1, 1A, 1B Indoor unit 2 Outdoor unit 3 Heat source unit 4 Air conditioner 5 Indoor heat exchanger 5a Indoor heat exchanger 5b supplied with refrigerant Indoor heat exchanger 6 supplied with hot water Flow variable valve (hot water control valve) )
8 Room temperature sensor 12 Refrigerant compressor 13 Outdoor heat exchanger 14 Four-way valve 16 Refrigerant pipe 16a Inter-unit pipe 17 for refrigerant 17 Electric expansion valve 18 Controller 22 Heater 23 Hot water heat exchanger 26 Hot water pipe 26a Inter-unit pipe for hot water 33 Refrigerant temperature sensor (refrigerant temperature detection means)
34 Hot water temperature sensor (hot water temperature detection means)
P1 first temperature (temperature at the start of refrigerant compressor operation)
P2 2nd temperature (temperature when refrigerant compressor operation stops)
P3 Third temperature (temperature when the flow variable valve is open)
P4 4th temperature (temperature when the variable flow valve is closed)
P5 5th temperature P6 6th temperature Q1, Q2 Detection temperature coincidence point of refrigerant temperature sensor and hot water temperature sensor

Claims

A refrigerant compressor, a refrigeration cycle composed of an indoor heat exchanger supplied with refrigerant, and a hot water circulation circuit composed of a hot water control valve, an indoor heat exchanger supplied with hot water, etc. In an air conditioner that performs heating operation using either an indoor heat exchanger that is supplied or an indoor heat exchanger that is supplied with hot water, heating operation using the indoor heat exchanger supplied with refrigerant and hot water are supplied Control to perform a combined operation of a heating operation using an indoor heat exchanger to which refrigerant is supplied and a heating operation using an indoor heat exchanger to which hot water is supplied when switching between heating operation using the indoor heat exchanger to be performed have a device, combined operation the control device from the start, after which the temperature of the indoor heat exchanger temperature and the hot water of the indoor heat exchanger refrigerant is supplied is supplied matches, a predetermined time has elapsed the child that is responsible for the combined operation to continue until the Air conditioner according to claim.

When heating operation is performed using an indoor heat exchanger to which hot water is supplied, when the room temperature rises to a fifth temperature that is lower than the set temperature, the air conditioner operates and the indoor heat to which refrigerant is supplied. When switching to the heating operation using the exchanger and performing the heating operation using the indoor heat exchanger to which the refrigerant is supplied, when the room temperature drops to the sixth temperature lower than the fifth temperature, the air The air conditioner according to claim 1 , wherein the conditioner switches the operation to a heating operation using an indoor heat exchanger to which hot water is supplied.