JP4360855B2

JP4360855B2 - Air conditioning system

Info

Publication number: JP4360855B2
Application number: JP2003196935A
Authority: JP
Inventors: 和彦河合; 康文畑村
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2003-07-15
Filing date: 2003-07-15
Publication date: 2009-11-11
Anticipated expiration: 2023-07-15
Also published as: JP2005036989A

Description

【０００１】
【発明の属する技術分野】
本発明は、発熱機器が設置された室内を冷却したり除湿する空気調和システムに関するものである。
【０００２】
【従来の技術】
今般、高顕熱負荷を発生する発熱機器等が設置された空間の空気調和においては、圧縮機、室外熱交換器、膨張弁、室内熱交換器を順次接続した冷媒回路が汎用されるが、室内熱交換器の容量を大きくし、蒸発温度を高くして顕熱比を大きくすることにより、顕熱負荷だけを処理するようにしている。
【０００３】
このような従来技術の一つとして、後述する特許文献１に記載された空気調和システムが挙げられる。特許文献１に記載の空気調和システムを図４，５，６に示す。かかる文献記載の空気調和システムの構成および動作を説明する。図４は空気調和システム６１の概略構成を示す正面構成図、図５は空気調和システム６１の概略構成を示す平面構成図、図６は空気調和システム６１の概略構成を示す側面構成図である。尚、この空気調和システム６１は、クリーンルーム７０に適用した例を示している。また説明のため、図５では、高性能フィルタ７７を省略して示している。
【０００４】
クリーンルーム７０は建物７１の内部に形成されており、図示はしないが、クリーンルーム７０内にはその目的に応じて各種の機器が設置されている。このクリーンルーム７０の天井面は給気面７２に形成されており、クリーンルーム７０の床面は、例えばパンチング板やグレイチング床などからなる還気面７３に形成されている。給気面７２の上方（天井裏空間）に形成された給気チャンバー７４と、還気面７３の下方（床下空間）に形成された還気チャンバー７５とは還気ダクト７６によって接続されている。これらの還気チャンバー７５と還気ダクト７６と給気チャンバー７４とによって、クリーンルーム７０内に空気を循環供給するようになっている。給気面７２には、ＨＥＰＡフィルタやＵＬＰＡフィルタなどといった高性能フィルタ７７が設置されており、給気面７２の全体に高性能フィルタ７７が並べてある。
【０００５】
還気ダクト７６には、複数（この例では、図５に示すように６台）の室内機８０，８０，８０，８０，８０，８０が設置されており、これらの室内機８０に冷媒管８１を通じて液状の冷媒を供給する２台の室外機８２，８２が、クリーンルーム７０内から熱的に隔離された建物７１の外部に設置されている。各室内機８０には、冷媒を蒸発させて空気を冷却させるための冷却コイルおよび図示しない膨張弁を備える直膨型熱交換器８５と、ファン８６とがそれぞれ設けられている。そして、ファン８６の稼働により、還気チャンバー７５、還気ダクト７６および給気チャンバー７４を通じてクリーンルーム７０内に清浄な空気を循環供給し、その際に、直膨型熱交換器８５によって空気を冷却することにより、クリーンルーム７０内に設置された各種の発熱機器（図示せず）の発熱を補償するようになっている。
【０００６】
各室外機８２には、室内機８０内に介装された膨張弁によって直膨型熱交換器８５で蒸発したガス状の冷媒が、冷媒管８７を通じて戻されるようになっている。各室外機８２には、冷媒をガス状から液状に戻すのに必要な圧縮機や凝縮器等がそれぞれ設けられている。そして、クリーンルーム７０内から熱的に隔離された外気と冷媒を室外機内に設けた送風機によって熱交換させるようになっている。そして、前述の各室内機８０に設けられた直膨型熱交換器８５と、これら各室外機８２に設けられた圧縮機や凝縮器等によってヒートポンプを構成している。
【０００７】
図６に示すように、この例では建物７１の外部に２台の室外機８２を設置し、建物７１の内部に６台の室内機８０を設置することにより、直膨型熱交換器８５の設置数を室外機８２の設置数よりも多くしている。そして、各直膨型熱交換器８５の容量は例えば２５ずつになっており、各室外機８２の容量は例えば５０ずつになっている。これにより、直膨型熱交換器８５の合計容量（２５×６＝１５０）が室外機８２の合計容量（５０×２＝１００）よりも大きくなるように構成されている。これは、例えば通常の事務所の空調で用いられるマルチパッケージシステムにおいて、室外機の容量を室内機の１．５倍とした構成となっている。
【０００８】
以上のように構成された従来の空気調和システムにあっては、クリーンルーム７０内の空気が、還気面７３から下向きに吐出されて還気チャンバー７５に排気される。そして、各室内機８０に設けられたファン８６の稼働により、還気チャンバー７５、還気ダクト７６および給気チャンバー７４を通じて送風され、フィルタ７７でろ過された清浄な空気がクリーンルーム７０内に循環供給される。その際、各室内機８０に設けられた直膨型熱交換器８５において冷媒が蒸発することにより空気が冷却され、クリーンルーム７０内に設置された発熱機器の発熱が補償される。また一方で、各直膨型熱交換器８５に供給されて蒸発した冷媒は、建物７１の外部に設置された各室外機８２によって圧縮、凝縮され再び直膨型熱交換器８５に供給される。
【０００９】
この空調システムにあっては、先に図６で説明したように直膨型熱交換器８５の合計容量を室外機８２の合計容量よりも大きく設定するとともに直膨型熱交換器８５の伝熱面積を大きくすることで、一台当たりの熱負荷が相対的に少なくなり、処理空気の直膨型熱交換器８５出入口温度差（コイル出入口温度差）を小さくし、直膨型熱交換器８５における冷媒の蒸発温度と表面温度をより高く設定できる。これにより、直膨型熱交換器８５を通過する空気中の水分の凝縮量が少なくなるか、もしくは水分が凝縮しないようになっている。
【００１０】
【特許文献１】
特開２０００−３５６４２２号公報
【００１１】
【発明が解決しようとする課題】
しかしながら、上記従来システムのように、室外機と室内機の稼動台数を調整して室内熱交換器の蒸発温度により除湿するものでは、システム全体の容量が大きくなって設置スペースをとりすぎたり、顕熱能力が不足したりする。
また、室内に取り込まれた外気による潜熱負荷や、発熱機器の温度上昇による顕熱負荷が急激に変化した場合に、これらの負荷変化に適切に追従して処理することができない。
そして、一つの冷媒回路系統に複数の室内機が接続されているので、室外機が故障した際には室内の温湿度を適切な条件に維持できない。
更には、外気等に伴って持ち込まれた潜熱負荷により、ルーム内で局所的に潜熱負荷が大きくなる空間（換気扇の近傍空間など）ができやすくなるが、その空間の潜熱負荷を重点的に処理することが困難であった。
そのうえ、潜熱負荷と顕熱負荷の双方が大きい場合に、どちらかを優先して処理するといった工夫もなされていなかった。
【００１２】
【課題を解決するための手段】
上記した種々の課題を解決するために、この発明は、発熱機器が設置された室内を冷却する空気調和システムであって、容量制御可能な第１の圧縮機、第１の室外熱交換器、第１の膨張弁および第１の室内熱交換器、を順次接続して構成された第１の冷媒回路系統と、容量制御可能な他の圧縮機、他の室外熱交換器、他の膨張弁および第１の室内熱交換器が設置されている同一の室内に設置された他の室内熱交換器、を順次接続して構成された他の冷媒回路系統と、第１の室内熱交換器および他の室内熱交換器に通風して室内に送風する可変風量制御可能な第１の送風手段と、室内の温度および湿度を検知する温湿度検知手段と、温湿度検知手段による検知温度および検知湿度に基づいて第１または他の圧縮機、第１または他の膨張弁、あるいは第１の送風手段を制御することにより、一方の冷媒回路系統の室内熱交換器における冷媒の蒸発温度を一時的に室内空気の露点以下にし、除湿能力が不足していると判断すると、他方の冷媒回路系統の室内熱交換器における冷媒の蒸発温度を一時的に室内空気の露点以下にする所定除湿運転を行う第１の制御手段とを備えて成る空気調和システムを提供する。
【００１３】
また、発熱機器が設置された室内を冷却する空気調和システムであって、容量制御可能な第１の圧縮機、第１の室外熱交換器、第１の膨張弁および第１の室内熱交換器、を順次接続して構成された第１の冷媒回路系統と、容量制御可能な他の圧縮機、他の室外熱交換器、他の膨張弁および第１の室内熱交換器が設置されている同一の室内に設置された他の室内熱交換器、を順次接続して構成された他の冷媒回路系統と、第１の室内熱交換器に通風して室内に送風する可変風量制御可能な第２の送風手段と、他の室内熱交換器に通風して室内に送風する可変風量制御可能な第３の送風手段と、室内の温度および湿度を検知する温湿度検知手段と、温湿度検知手段による検知温度および検知湿度に基づいて第１または他の圧縮機、第１または他の膨張弁、あるいは第２または第３の送風手段を制御することにより、一方の冷媒回路系統の室内熱交換器における冷媒の蒸発温度を一時的に室内空気の露点以下にし、除湿能力が不足していると判断すると、他方の冷媒回路系統の室内熱交換器における冷媒の蒸発温度を一時的に室内空気の露点以下にする所定除湿運転を行う第２の制御手段とを備えて成る空気調和システムを提供する。
【００１４】
【発明の実施の形態】
実施の形態１．
本発明による実施の形態１を図１に示す。図に示すように、この実施形態に係る空気調和システムは、冷媒回路系統（第１の冷媒回路系統）１０ａと、冷媒回路系統（他の冷媒回路系統）１０ｂを併有している。冷媒回路系統１０ａは、容量制御可能な圧縮機（第１の圧縮機）２１、室外熱交換器（第１の室外熱交換器）２２、膨張弁（第１の膨張弁）１１および室内熱交換器（第１の室内熱交換器）１２がそれぞれ冷媒配管２３を介して順次接続されることにより構成されている。また、冷媒回路系統１０ｂは、容量制御可能な圧縮機（他の圧縮機）３１、室外熱交換器（他の室外熱交換器）３２、膨張弁（他の膨張弁）１３および室内熱交換器（他の室内熱交換器）１４がそれぞれ冷媒配管３３を介して順次接続されることにより構成されている。
【００１５】
この例では、冷媒回路系統１０ａの構成要素のうち、圧縮機２１および室外熱交換器２２が室外機２に搭載され、膨張弁１１および室内熱交換器１２は室内機１に搭載されている。そして、室外機２には、室外熱交換器２２に送風する室外機送風手段２４と、圧縮機２１や室外機送風手段２４を駆動制御する室外機制御手段２５が搭載されている。一方、冷媒回路系統１０ｂの構成要素のうち、圧縮機３１および室外熱交換器３２は室外機３に搭載されている。膨張弁１３および室内熱交換器１４は、室内熱交換器１２が設置されたと同一の室内機１に搭載されている。そして、室外機３に、室外熱交換器３２に送風する室外機送風手段３４と、圧縮機３１や室外機送風手段３４を駆動制御する室外機制御手段３５が搭載されている。また、室内機１内には、室内熱交換器１２および室内熱交換器１４の双方に通風して室内５に送風する可変風量制御可能な案内機送風手段（第１の送風手段）１６が１つ配備されている。
【００１６】
前記の室内機１は、発熱機器４が設置された室内５に配置されて室内５を冷却・除湿するようになっている。室内５には、当該室内温度および室内湿度を検知する温湿度検知手段５１が配備されている。温湿度検知手段５１は通信手段１７を介して室内機１内の室内機制御手段１５（第１の制御手段）と通信接続されている。また、室内機制御手段１５は通信手段１８を介して室外機制御手段２５および室外機制御手段３５と通信接続されている。室内機制御手段１５は、温湿度検知手段５１による検知温度および検知湿度に基づいて冷媒回路系統１０ａおよび／または冷媒回路系統１０ｂを制御するようになっている。
【００１７】
上記構成の空気調和システムにおいて、温湿度検知手段５１により検知された検知信号は通信手段１７を介して室内機制御手段１５へ送信される。室内機制御手段１５は、室内機１の冷媒配管温度、室内熱交換器１２，１４の温度、室内機１への吸込み空気温度、室内機１からの吹き出し空気温度、室内５の温湿度状態等の検知データを取り込んで、膨張弁１１、膨張弁１３、あるいは、室内機送風手段１６を適宜組み合わせて制御する。また、通信手段１８を介して室外機制御手段２５および／または室外機制御手段３５と通信を行う。室外機制御手段２５および／または室外機制御手段３５は、室内機制御手段１５から送信された情報と、室外機２，３の冷媒配管温度、室外熱交換器温度、吸込み外気温度等に基づいて、圧縮機２１および／または圧縮機３１の容量制御を行う。これにより、室内熱交換器１２および／または室内熱交換器１４における冷媒の蒸発温度を一時的に室内空気の露点以下にするといった除湿運転（以下、かかる運転態様が「所定除湿運転」である）が実行される。
【００１８】
すなわち、室内湿度が予め設定されている目標湿度範囲の上限を超えたと温湿度検知手段５１によって検知された場合、室内機制御手段１５は例えば室外機２に接続された冷媒回路系統１０ａの圧縮機２１の出力増加や膨張弁１１の開度増加を行なって冷媒循環量を増やしたり、室内機送風手段１６の風量を低下させたりすることで、室内熱交換器１２の蒸発温度を通常運転時よりも一時的に室内空気の露点以下まで低くして除湿運転を行う。一定時間、前記の所定除湿運転を行って室内湿度が目標湿度範囲内に戻ると、通常運転に戻す。一方、室内機制御手段１５は除湿能力が足りないと判断すると、他方の冷媒回路系統１０ｂの室内熱交換器１４においても同様に蒸発温度を低くし、除湿能力を増大させる。この時、潜熱処理量を増やしたことによって顕熱処理能力が低下する。
【００１９】
しかしながら、室内湿度と同時に温湿度検知手段５１によって室内温度も検知されているため、室内機制御手段１５は、検知温度および検知湿度のうちで設定目標範囲を大きく外れている方（温度または湿度）を判断し、除湿（潜熱）優先運転または冷却（顕熱）優先運転を選択して実施することができる。また、一つの室内機１で、各冷媒回路系統１０ａ，１０ｂごとに除湿運転の優先度合いを変化させられるため、能力を潜熱負荷の変化に追従させることが可能である。更には、一方の冷媒回路系統が故障しても、他方の冷媒回路系統で運転を継続できるので、急激に室内５の空調状態を悪化させることもない。そして、冷媒回路系統を有しているにも拘わらず、室内機１（特に、室内機送風手段１６）は１台で済むので、システム全体の容量を小さくでき省スペース化を図ることが可能となる。尚、室内機１に搭載される他の冷媒回路系統の室内熱交換器は上記のように１系統のものだけでなく、２系統以上の室内熱交換器を搭載しても構わない。
【００２０】
実施の形態２．
本発明による実施の形態２を図２に示す。図において、この実施形態に係る空気調和システムは、冷媒回路系統（第１の冷媒回路系統）１０ｃと、冷媒回路系統（他の冷媒回路系統）１０ｄと、冷媒回路系統（他の冷媒回路系統）１０ｅを併有している。冷媒回路系統１０ｃは室内機１ａと室外機２ａとが冷媒配管２３ａを介して接続され、冷媒回路系統１０ｄは室内機１ｂと室外機２ｂとが冷媒配管２３ｂを介して接続され、冷媒回路系統１０ｅは室内機１ｃと室外機２ｃとが冷媒配管２３ｃを介して接続されている。いずれも図示は省略するが、室外機２ａ，２ｂ，２ｃには、実施形態１の室外機２，３と同様の、容量制御可能な第１の圧縮機または他の圧縮機、第１の室外熱交換器または他の室外熱交換器および室外機送風手段がそれぞれ搭載されている。
室内機１ａには第１の室内熱交換器１２ａ、第１の膨張弁１１ａ、第１の室内機制御手段１５ａ（第２の制御手段）が配備され、室内機１ｂには他の室内熱交換器１２ｂ、他の膨張弁１１ｂ、他の室内機制御手段１５ｂ（第３の制御手段）が配備され、室内機１ｃには他の室内熱交換器１２ｃ、他の膨張弁１１ｃ、他の室内機制御手段１５ｃ（第３の制御手段）が配備されている。
【００２１】
この実施形態では、それぞれの室内機１ａ，１ｂ，１ｃに個別に送風手段が配備されている。すなわち、第１の室内熱交換器１２ａに通風して室内５に送風する可変風量制御可能な送風手段（第２の送風手段）１６ａが室内機１ａに配備され、他の室内熱交換器１２ｂに通風して室内５に送風する可変風量制御可能な送風手段（第３の送風手段）１６ｂが室内機１ｂに配備され、他の室内熱交換器１２ｃに通風して室内５に送風する可変風量制御可能な送風手段（第３の送風手段）１６ｃが室内機１ｃに配備されている。
そして、室内機１ａ，１ｂ，１ｃは、発熱機器４が設置された室内５に配置されて室内５を冷却・除湿する。室内５には、当該室内温度および室内湿度を検知する温湿度検知手段５１が配備されている。温湿度検知手段５１は通信手段１７を介して室内機１内の室内機制御手段１５と通信接続されている。室内機１ａ，１ｂ，１ｃの室内機制御手段１５ａ，１５ｂ，１５ｃと室外機２ａ，２ｂ，２ｃの制御手段（図示省略）とは、実施形態１と同様に、通信手段１８によって接続され相互通信される。
【００２２】
上記のように構成された空気調和システムでは、室内湿度が予め設定されている目標湿度範囲の上限を超えたと温湿度検知手段５１によって検知された場合、室内機制御手段１５ａ，１５ｂ，１５ｃは冷媒回路系統１０ｃ，１０ｄ，１０ｅにおける圧縮機（図示省略）の出力増加や膨張弁１１ａ，１１ｂ，１１ｃの開度増加を行なって冷媒循環量を増やしたり、室内機送風手段１６ａ，１６ｂ，１６ｃの風量を低下させたりすることで、室内熱交換器１２ａ，１２ｂ，１２ｃの蒸発温度を通常運転時よりも一時的に室内空気の露点以下まで低くする所定除湿運転を行う。
この場合も、室内機制御手段１５ａ，１５ｂ，１５ｃは実施形態１と同様に作用する。すなわち、検知温度および検知湿度のうちで設定目標範囲を大きく外れている方（温度または湿度）を判断し、除湿（潜熱）優先運転または冷却（顕熱）優先運転を選択して実行させることができる。また、一つの室内機１で、各冷媒回路系統１０ｃ，１０ｄ，１０ｅごとに除湿運転の優先度合いを変化させられるため、能力を潜熱負荷に追従させることが可能である。更には、一つの冷媒回路系統が故障しても、残りの冷媒回路系統で運転を継続できるので、急激に室内５の空調状態を悪化させることがない。
【００２３】
実施の形態３．
本発明による実施の形態３を図３に示す。この実施形態に示した室内５には、室外空気導入用として２つの換気手段５２ａ，５２ｂが設けられ、２つの加熱機器４ａ，４ｂが設置され、室内５の複数箇所の温度および湿度を検知する３つの温湿度検知手段５１ａ，５１ｂ，５１ｃが配備されている。そして、この実施形態の空気調和システムは、実施形態１で示した冷媒回路系統１０ａ，１０ｂと、実施形態２で示した冷媒回路系統１０ｄ，１０ｅの合計４系統を備えている。各冷媒回路系統１０ａ，１０ｂ，１０ｄ，１０ｅの室内機１，１ｂ，１ｃは室内５で発熱機器４ａ，４ｂの近傍位置に設置されており、それぞれに室内機送風手段１６，１６ｂ，１６ｃが配備されている。また、この空気調和システムは、３つの温湿度検知手段５１ａ，５１ｂ，５１ｃによる検知温度および検知湿度に基づいて室内５における潜熱負荷の高い空間を検知する空間検知手段４０と、空間検知手段４０による検知空間に近い室内熱交換器１２，１４，１２ｂ，１２ｃを持つ冷媒回路系統１０ａ，１０ｂ，１０ｄ，１０ｅに所定の除湿運転を実行させる室内機制御手段４１（第３の制御手段）とを備えている。温湿度検知手段５１、空間検知手段４０、室内機制御手段４１、室内機１，１ｂ，１ｃの室内機制御手段（不図示）は、通信手段１７を介して通信接続されている。室内機１，１ｂ，１ｃの室内機制御手段は図示せぬ通信手段を介して室外機２，３，２ｂ，２ｃの室外機制御手段（不図示）と通信接続されている。
【００２４】
従って、換気手段５２ａ，５２ｂの駆動によって湿度の高い外気が室内５に取り込まれた場合でも、温湿度検知手段５１ａ，５１ｂ，５１ｃおよび空間検知手段４０によって、潜熱負荷が高いと判断された空間に近い室内熱交換器１２，１４，１２ｂ，１２ｃを持つ冷媒回路系統１０ａ，１０ｂ，１０ｄ，１０ｅが、当該室内熱交換器の蒸発温度を通常運転時よりも一時的に室内空気の露点以下まで低くした所定除湿運転を行って室内５の温湿度を適切な状態に維持するのである。これにより、室外などから室内５に持ち込まれた潜熱負荷が一部の空間に偏っても、その空間の潜熱負荷を適切に処理することができる。
【００２５】
実施の形態４．
本発明による実施の形態４を下記に示す。この実施形態による空気調和システムは、図３に示した実施の形態３の構成とほとんど同じである。但し、温湿度検知手段５１ａ，５１ｂ，５１ｃによる検知温度と設定目標温度との温度差および検知湿度と設定目標湿度との湿度差に基づいて顕熱負荷除去運転と潜熱負荷除去運転のどちらを優先させるかを判定する優先運転判定手段の機能と、優先運転判定手段により判定された運転を優先させながら所定の除湿運転を行う第４の制御手段の機能を、室内機制御手段４１に持たせた点に特徴がある。
【００２６】
この場合、温湿度検知手段５１ａ，５１ｂ，５１ｃによって検知された全ての相対湿度が、例えば９０％なら一時的に全ての室内機１，１ｂ，１ｃで除湿運転をし、７５〜９０％、６０〜７５％、５０〜６０％というように冷媒回路系統１０ａ，１０ｂ，１０ｄ，１０ｅの稼動系統数を段階的に変えて所定の除湿運転をする。この時、除湿運転を優先して行っているが、室内温度が上昇しすぎないように、両方（温度または湿度）の設定目標範囲から大きく外れたほうを優先して運転をする。これにより、潜熱、顕熱負荷ともに効率よく処理することができる。
例えば、室内温度の設定目標範囲が２０〜２５℃であり、室内相対湿度の設定目標範囲が２０〜５０％であったとすると、検知温度が２８℃で検知湿度が４０％のときは、優先運転判定手段の機能により顕熱負荷除去運転が優先されると判定され、或る冷媒回路系統により顕熱負荷除去運転を優先させながら他の冷媒回路系統では所定の除湿運転を実行するのである。従って、潜熱負荷および顕熱負荷も大きい場合でも、どちらかを優先して処理することができる。尚、例えば、検知温度が２８℃で検知湿度が８０％といったように両方が設定目標範囲から外れている場合は、より外れた度合いの大きい方（この例では湿度）を抑えるために、この例では除湿運転を優先させながら他の冷媒回路系統で顕熱負荷除去運転を行う。
【００２７】
また、実施の形態３の構成について、温湿度検知手段５１ａ，５１ｂ，５１ｃによる検知湿度に基づいて各冷媒回路系統１０ａ，１０ｂ，１０ｄ，１０ｅに優先順位をつける系統優先順付与手段の機能と、この系統優先順付与手段により付された優先順位に従って各冷媒回路系統１０ａ，１０ｂ，１０ｄ，１０ｅに所定の除湿運転を実行させる第５の制御手段の機能を、室内機制御手段４１に付加してもよい。
【００２８】
尚、これまでに述べた室内機制御手段１５，１５ａ，１５ｂ，１５ｃ，４１、空間検知手段４０、あるいは室外機制御手段２５，３５の機能は、特に限定されるものでないが、例えばマイクロコンピュータおよびメモリの組合せ構成により実現される。
【００２９】
【発明の効果】
以上詳述したように、この発明によれば、検知した室内温度および室内湿度に応じて、複数の冷媒回路系統のうち、一部を冷媒回路系統の室内熱交換器における冷媒の蒸発温度を一時的に室内空気の露点以下にして除湿運転し、除湿能力が不足していると判断すれば他の冷媒回路系統についても室内熱交換器における冷媒の蒸発温度を一時的に室内空気の露点以下にするので、潜熱除去運転はもとより顕熱除去運転も同時に行える。従って、システム全体として顕熱能力不足に陥りにくい。また、一つの冷媒回路系統が故障した場合でも、残りの冷媒回路系統により室内の温湿度を適切な状態に維持することが可能である。更には、外気の導入や発熱機器からの急な発熱などにより室内の潜熱負荷や顕熱負荷が急激に変化しても、適切に追従してそれぞれの負荷を処理できる。一方、複数の冷媒回路系統の室内熱交換器全てに対し一つの送風手段で通風して室内へ送風するように構成した場合は、室内熱交換器ごとに個別に送風手段を配備した場合と比べてシステム全体をコンパクトにすることができる。
【図面の簡単な説明】
【図１】本発明の実施の形態１に係る空気調和システムの構成図である。
【図２】本発明の実施の形態２に係る空気調和システムの構成図である。
【図３】本発明の実施の形態３に係る空気調和システムの構成図である。
【図４】従来技術に係る空気調和システムの正面構成図である。
【図５】前記従来技術に係る空気調和システムの平面構成図である。
【図６】前記従来技術に係る空気調和システムの側面構成図である。
【符号の説明】
１室内機、１ａ室内機、１ｂ室内機、１ｃ室内機、２室外機、２ａ室外機、２ｂ室外機、２ｃ室外機、３室外機、４，４ａ，４ｂ発熱機器、５室内、１０，１０ａ，１０ｂ，１０ｃ，１０ｄ，１０ｅ冷媒回路系統、１１，１１ａ，１１ｂ，１１ｃ，１３膨張弁、１２，１２ａ，１２ｂ，１２ｃ，１４室内熱交換器、１５，１５ａ，１５ｂ，１５ｃ室内機制御手段、１６，１６ａ，１６ｂ，１６ｃ室内機送風手段、２１圧縮機、２２室外熱交換器、２３冷媒配管、３１圧縮機、３２室外熱交換器、３３冷媒配管、５１，５１ａ，５１ｂ，５１ｃ温湿度検知手段。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an air conditioning system that cools or dehumidifies a room in which a heat generating device is installed.
[0002]
[Prior art]
Recently, in air conditioning in a space where a heat generating device that generates a high sensible heat load is installed, a refrigerant circuit in which a compressor, an outdoor heat exchanger, an expansion valve, and an indoor heat exchanger are sequentially connected is widely used. Only the sensible heat load is processed by increasing the capacity of the heat exchanger, increasing the evaporation temperature, and increasing the sensible heat ratio.
[0003]
As one of such prior arts, there is an air conditioning system described in Patent Document 1 described later. The air conditioning system described in Patent Document 1 is shown in FIGS. The configuration and operation of the air conditioning system described in this document will be described. 4 is a front configuration diagram illustrating a schematic configuration of the air conditioning system 61, FIG. 5 is a plan configuration diagram illustrating a schematic configuration of the air conditioning system 61, and FIG. 6 is a side configuration diagram illustrating a schematic configuration of the air conditioning system 61. Note that this air conditioning system 61 is applied to a clean room 70. For the sake of explanation, the high performance filter 77 is omitted in FIG.
[0004]
The clean room 70 is formed inside the building 71. Although not shown, various devices are installed in the clean room 70 according to the purpose. The ceiling surface of the clean room 70 is formed on an air supply surface 72, and the floor surface of the clean room 70 is formed on a return air surface 73 made of, for example, a punching plate or a grating floor. An air supply chamber 74 formed above the air supply surface 72 (ceiling space) and a return air chamber 75 formed below the return air surface 73 (under the floor space) are connected by a return air duct 76. . The return air chamber 75, the return air duct 76, and the air supply chamber 74 circulate and supply air into the clean room 70. A high performance filter 77 such as a HEPA filter or a ULPA filter is installed on the air supply surface 72, and the high performance filter 77 is arranged on the entire air supply surface 72.
[0005]
In the return air duct 76, a plurality of (in this example, six as shown in FIG. 5) indoor units 80, 80, 80, 80, 80, 80 are installed. Two outdoor units 82 and 82 that supply liquid refrigerant through 81 are installed outside a building 71 that is thermally isolated from the clean room 70. Each indoor unit 80 is provided with a direct expansion heat exchanger 85 including a cooling coil for evaporating the refrigerant to cool the air and an expansion valve (not shown), and a fan 86. Then, by operating the fan 86, clean air is circulated and supplied into the clean room 70 through the return air chamber 75, the return air duct 76, and the air supply chamber 74, and at that time, the air is cooled by the direct expansion heat exchanger 85. By doing so, heat generation of various heat generating devices (not shown) installed in the clean room 70 is compensated.
[0006]
The gaseous refrigerant evaporated in the direct expansion heat exchanger 85 by the expansion valve interposed in the indoor unit 80 is returned to each outdoor unit 82 through the refrigerant pipe 87. Each outdoor unit 82 is provided with a compressor, a condenser, and the like necessary for returning the refrigerant from a gaseous state to a liquid state. The outside air and the refrigerant thermally isolated from the clean room 70 are heat-exchanged by a blower provided in the outdoor unit. And the heat pump is comprised by the direct expansion type heat exchanger 85 provided in the above-mentioned each indoor unit 80, and the compressor, the condenser, etc. which were provided in these each outdoor unit 82.
[0007]
As shown in FIG. 6, in this example, two outdoor units 82 are installed outside the building 71, and six indoor units 80 are installed inside the building 71, so that the direct expansion heat exchanger 85 is installed. The number of installations is larger than the number of outdoor units 82 installed. And each direct expansion type heat exchanger 85 has a capacity of 25, for example, and each outdoor unit 82 has a capacity of 50, for example. Thereby, the total capacity (25 × 6 = 150) of the direct expansion heat exchanger 85 is configured to be larger than the total capacity (50 × 2 = 100) of the outdoor unit 82. For example, in a multi-package system used for normal office air conditioning, the capacity of the outdoor unit is 1.5 times that of the indoor unit.
[0008]
In the conventional air conditioning system configured as described above, the air in the clean room 70 is discharged downward from the return air surface 73 and exhausted to the return air chamber 75. Then, with the operation of the fan 86 provided in each indoor unit 80, clean air that is blown through the return air chamber 75, the return air duct 76, and the air supply chamber 74 and filtered by the filter 77 is circulated and supplied into the clean room 70. Is done. At that time, the refrigerant evaporates in the direct expansion heat exchanger 85 provided in each indoor unit 80, whereby the air is cooled, and the heat generation of the heat generating device installed in the clean room 70 is compensated. On the other hand, the refrigerant supplied to each direct expansion heat exchanger 85 and evaporated is compressed and condensed by each outdoor unit 82 installed outside the building 71 and supplied to the direct expansion heat exchanger 85 again. .
[0009]
In this air conditioning system, the total capacity of the direct expansion heat exchanger 85 is set to be larger than the total capacity of the outdoor unit 82 and the heat transfer of the direct expansion heat exchanger 85 as described above with reference to FIG. By increasing the area, the heat load per unit becomes relatively small, the direct expansion heat exchanger 85 inlet / outlet temperature difference (coil inlet / outlet temperature difference) of the processing air is reduced, and the direct expansion heat exchanger 85 is reduced. The evaporation temperature and surface temperature of the refrigerant in can be set higher. As a result, the amount of moisture in the air passing through the direct expansion heat exchanger 85 is reduced, or the moisture is not condensed.
[0010]
[Patent Document 1]
JP 2000-356422 A
[0011]
[Problems to be solved by the invention]
However, if the number of outdoor units and the number of indoor units is adjusted and dehumidified by the evaporation temperature of the indoor heat exchanger as in the conventional system described above, the capacity of the entire system becomes large and it takes up too much installation space. Insufficient heat capacity.
Further, when the latent heat load due to the outside air taken into the room or the sensible heat load due to the temperature rise of the heat generating device changes suddenly, it is not possible to properly follow these load changes for processing.
And since several indoor units are connected to one refrigerant circuit system, when an outdoor unit fails, indoor temperature and humidity cannot be maintained on an appropriate condition.
Furthermore, the latent heat load brought in due to outside air, etc. makes it easier to create a space where the latent heat load is locally increased (such as a space near the ventilation fan) in the room, but the latent heat load in that space is processed with priority. It was difficult to do.
In addition, when both the latent heat load and the sensible heat load are large, there has been no contrivance to prioritize either one.
[0012]
[Means for Solving the Problems]
In order to solve the various problems described above, the present invention is an air conditioning system that cools a room in which a heat generating device is installed, and includes a first compressor capable of capacity control, a first outdoor heat exchanger, A first refrigerant circuit system configured by sequentially connecting a first expansion valve and a first indoor heat exchanger, another compressor whose capacity can be controlled, another outdoor heat exchanger, and another expansion valve And another refrigerant circuit system configured by sequentially connecting the other indoor heat exchangers installed in the same room where the first indoor heat exchanger is installed, the first indoor heat exchanger, First air blowing means capable of variable air volume control that ventilates other indoor heat exchangers and blows indoors, temperature / humidity detecting means for detecting indoor temperature and humidity, temperature and humidity detected by temperature / humidity detecting means Based on the first or other compressor, the first or other expansion valve, is By controlling the first sending means, One Temporarily lower the evaporation temperature of the refrigerant in the indoor heat exchanger of the refrigerant circuit system below the dew point of the room air If the dehumidifying capacity is determined to be insufficient, the evaporation temperature of the refrigerant in the indoor heat exchanger of the other refrigerant circuit system is temporarily reduced below the dew point of the indoor air. And an air conditioning system including a first control means for performing a predetermined dehumidifying operation.
[0013]
An air conditioning system for cooling a room in which a heat generating device is installed, the first compressor capable of controlling capacity, the first outdoor heat exchanger, the first expansion valve, and the first indoor heat exchanger. , And a first refrigerant circuit system configured by sequentially connecting, other compressors capable of capacity control, other outdoor heat exchangers, other expansion valves, and a first indoor heat exchanger are installed. Other refrigerant circuit systems configured by sequentially connecting other indoor heat exchangers installed in the same room, and a variable air volume controllable air flow through the first indoor heat exchanger and blown into the room 2 air blowing means, a third air blowing means capable of controlling the variable air volume to be blown into the room by passing through another indoor heat exchanger, a temperature / humidity detecting means for detecting the temperature and humidity in the room, and a temperature / humidity detecting means Based on the detected temperature and detected humidity by the first or other compressor, the first or other Expansion valve, or by controlling the second or third air blowing means, One Temporarily lower the evaporation temperature of the refrigerant in the indoor heat exchanger of the refrigerant circuit system below the dew point of the room air If the dehumidifying capacity is determined to be insufficient, the evaporation temperature of the refrigerant in the indoor heat exchanger of the other refrigerant circuit system is temporarily reduced below the dew point of the indoor air. And an air conditioning system comprising a second control means for performing a predetermined dehumidifying operation.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1 FIG.
Embodiment 1 according to the present invention is shown in FIG. As shown in the figure, the air conditioning system according to this embodiment has both a refrigerant circuit system (first refrigerant circuit system) 10a and a refrigerant circuit system (other refrigerant circuit system) 10b. The refrigerant circuit system 10a includes a compressor (first compressor) 21 capable of capacity control, an outdoor heat exchanger (first outdoor heat exchanger) 22, an expansion valve (first expansion valve) 11, and an indoor heat exchange. The units (first indoor heat exchangers) 12 are sequentially connected via refrigerant pipes 23, respectively. The refrigerant circuit system 10b includes a compressor (other compressor) 31 capable of capacity control, an outdoor heat exchanger (other outdoor heat exchanger) 32, an expansion valve (other expansion valve) 13, and an indoor heat exchanger. (Other indoor heat exchangers) 14 are sequentially connected via the refrigerant pipes 33, respectively.
[0015]
In this example, among the components of the refrigerant circuit system 10 a, the compressor 21 and the outdoor heat exchanger 22 are mounted on the outdoor unit 2, and the expansion valve 11 and the indoor heat exchanger 12 are mounted on the indoor unit 1. The outdoor unit 2 is equipped with an outdoor unit blower 24 that blows air to the outdoor heat exchanger 22 and an outdoor unit control unit 25 that drives and controls the compressor 21 and the outdoor unit blower 24. On the other hand, among the components of the refrigerant circuit system 10 b, the compressor 31 and the outdoor heat exchanger 32 are mounted on the outdoor unit 3. The expansion valve 13 and the indoor heat exchanger 14 are mounted on the same indoor unit 1 where the indoor heat exchanger 12 is installed. The outdoor unit 3 is equipped with an outdoor unit blower 34 that blows air to the outdoor heat exchanger 32 and an outdoor unit control unit 35 that drives and controls the compressor 31 and the outdoor unit blower 34. Further, in the indoor unit 1, there are 1 guide air blower means (first air blower means) 16 capable of controlling the variable air volume that ventilates both the indoor heat exchanger 12 and the indoor heat exchanger 14 and blows air into the room 5. One has been deployed.
[0016]
The indoor unit 1 is arranged in a room 5 in which a heat generating device 4 is installed to cool and dehumidify the room 5. The room 5 is provided with temperature and humidity detection means 51 for detecting the room temperature and the room humidity. The temperature / humidity detecting means 51 is communicatively connected to the indoor unit control means 15 (first control means) in the indoor unit 1 via the communication means 17. The indoor unit control means 15 is communicatively connected to the outdoor unit control means 25 and the outdoor unit control means 35 via the communication means 18. The indoor unit control means 15 controls the refrigerant circuit system 10a and / or the refrigerant circuit system 10b based on the temperature detected by the temperature / humidity detection means 51 and the detected humidity.
[0017]
In the air conditioning system having the above configuration, the detection signal detected by the temperature / humidity detection means 51 is transmitted to the indoor unit control means 15 via the communication means 17. The indoor unit control means 15 includes the refrigerant pipe temperature of the indoor unit 1, the temperatures of the indoor heat exchangers 12 and 14, the intake air temperature to the indoor unit 1, the temperature of air blown from the indoor unit 1, the temperature / humidity state of the indoor 5, etc. And the expansion valve 11, the expansion valve 13, or the indoor unit blowing means 16 are appropriately combined and controlled. Further, communication with the outdoor unit control unit 25 and / or the outdoor unit control unit 35 is performed via the communication unit 18. The outdoor unit control unit 25 and / or the outdoor unit control unit 35 is based on the information transmitted from the indoor unit control unit 15, the refrigerant pipe temperature of the outdoor units 2 and 3, the outdoor heat exchanger temperature, the suction outdoor air temperature, and the like. The capacity of the compressor 21 and / or the compressor 31 is controlled. As a result, the dehumidifying operation in which the refrigerant evaporating temperature in the indoor heat exchanger 12 and / or the indoor heat exchanger 14 is temporarily made lower than the dew point of the indoor air (hereinafter, this operating mode is the “predetermined dehumidifying operation”). Is executed.
[0018]
That is, when the temperature / humidity detection means 51 detects that the indoor humidity has exceeded the preset upper limit of the target humidity range, the indoor unit control means 15 is, for example, a compressor of the refrigerant circuit system 10a connected to the outdoor unit 2. The evaporating temperature of the indoor heat exchanger 12 is increased from that during normal operation by increasing the output of 21 and increasing the opening of the expansion valve 11 to increase the amount of refrigerant circulation or to reduce the air volume of the indoor unit blower 16. Also, dehumidify operation by temporarily lowering it below the dew point of the room air. When the predetermined dehumidifying operation is performed for a certain period of time and the room humidity returns to within the target humidity range, the normal operation is resumed. On the other hand, if the indoor unit control means 15 determines that the dehumidifying capacity is insufficient, the evaporating temperature is similarly lowered in the indoor heat exchanger 14 of the other refrigerant circuit system 10b to increase the dehumidifying capacity. At this time, the sensible heat treatment ability is reduced by increasing the amount of latent heat treatment.
[0019]
However, since the indoor temperature is also detected by the temperature / humidity detection means 51 at the same time as the indoor humidity, the indoor unit control means 15 is one of the detected temperature and the detected humidity that is significantly outside the set target range (temperature or humidity). And dehumidification (latent heat) priority operation or cooling (sensible heat) priority operation can be selected and executed. In addition, since the priority of the dehumidifying operation can be changed for each refrigerant circuit system 10a, 10b with one indoor unit 1, the capacity can be made to follow the change of the latent heat load. Furthermore, even if one refrigerant circuit system fails, the operation can be continued with the other refrigerant circuit system, so that the air conditioning state of the room 5 is not rapidly deteriorated. Even though the refrigerant circuit system is included, only one indoor unit 1 (particularly, the indoor unit air blowing means 16) is required, so that the capacity of the entire system can be reduced and space can be saved. Become. In addition, the indoor heat exchanger of the other refrigerant circuit system mounted in the indoor unit 1 may be mounted not only with one system as described above but also with two or more indoor heat exchangers.
[0020]
Embodiment 2. FIG.
A second embodiment according to the present invention is shown in FIG. In the figure, an air conditioning system according to this embodiment includes a refrigerant circuit system (first refrigerant circuit system) 10c, a refrigerant circuit system (other refrigerant circuit system) 10d, and a refrigerant circuit system (other refrigerant circuit system). 10e. In the refrigerant circuit system 10c, the indoor unit 1a and the outdoor unit 2a are connected through a refrigerant pipe 23a, and in the refrigerant circuit system 10d, the indoor unit 1b and the outdoor unit 2b are connected through a refrigerant pipe 23b, and the refrigerant circuit system 10e. The indoor unit 1c and the outdoor unit 2c are connected via a refrigerant pipe 23c. Although not shown in the drawings, the outdoor units 2a, 2b, and 2c are the same as the outdoor units 2 and 3 of the first embodiment. A heat exchanger or other outdoor heat exchanger and an outdoor unit air blowing means are respectively mounted.
The indoor unit 1a is provided with a first indoor heat exchanger 12a, a first expansion valve 11a, and first indoor unit control means 15a (second control means), and the indoor unit 1b has other indoor heat exchanges. 12b, another expansion valve 11b, and other indoor unit control means 15b (third control means) are provided, and the indoor unit 1c includes another indoor heat exchanger 12c, another expansion valve 11c, and other indoor units. Control means 15c (third control means) is provided.
[0021]
In this embodiment, the air blowing means is individually provided in each indoor unit 1a, 1b, 1c. In other words, a variable air volume controllable air blowing means (second air blowing means) 16a that ventilates the first indoor heat exchanger 12a and blows the air into the room 5 is provided in the indoor unit 1a, and is connected to the other indoor heat exchanger 12b. A variable air volume control that controls the variable air volume that is ventilated and blown into the room 5 (third blower means) 16b is provided in the indoor unit 1b and ventilates the other indoor heat exchanger 12c to blow into the room 5. Possible air blowing means (third air blowing means) 16c is provided in the indoor unit 1c.
And indoor unit 1a, 1b, 1c is arrange | positioned in the room 5 in which the heat generating apparatus 4 was installed, and cools and dehumidifies the room 5. The room 5 is provided with temperature and humidity detection means 51 for detecting the room temperature and the room humidity. The temperature / humidity detection means 51 is communicatively connected to the indoor unit control means 15 in the indoor unit 1 via the communication means 17. The indoor unit control means 15a, 15b, 15c of the indoor units 1a, 1b, 1c and the control means (not shown) of the outdoor units 2a, 2b, 2c are connected by the communication means 18 and communicate with each other, as in the first embodiment. Is done.
[0022]
In the air conditioning system configured as described above, when the temperature and humidity detection means 51 detects that the room humidity exceeds the preset upper limit of the target humidity range, the indoor unit control means 15a, 15b, and 15c are refrigerants. Increasing the output of the compressor (not shown) in the circuit systems 10c, 10d, and 10e and increasing the opening of the expansion valves 11a, 11b, and 11c to increase the refrigerant circulation amount, and the air volume of the indoor unit blowing means 16a, 16b, and 16c The predetermined dehumidifying operation is performed in which the evaporation temperature of the indoor heat exchangers 12a, 12b, and 12c is temporarily lowered below the dew point of the indoor air than during normal operation.
Also in this case, the indoor unit control means 15a, 15b, and 15c operate in the same manner as in the first embodiment. In other words, it is possible to determine which one of the detected temperature and detected humidity is far outside the set target range (temperature or humidity) and to select and execute dehumidification (latent heat) priority operation or cooling (sensible heat) priority operation. it can. Further, since the priority of the dehumidifying operation can be changed for each refrigerant circuit system 10c, 10d, 10e with one indoor unit 1, it is possible to make the capacity follow the latent heat load. Furthermore, even if one refrigerant circuit system fails, the operation can be continued with the remaining refrigerant circuit systems, so that the air conditioning state of the room 5 is not rapidly deteriorated.
[0023]
Embodiment 3 FIG.
A third embodiment according to the present invention is shown in FIG. In the room 5 shown in this embodiment, two ventilation means 52a and 52b are provided for introducing outdoor air, and two heating devices 4a and 4b are installed to detect temperatures and humidity at a plurality of locations in the room 5. Three temperature / humidity detection means 51a, 51b, 51c are provided. The air conditioning system of this embodiment includes a total of four systems, that is, the refrigerant circuit systems 10a and 10b shown in the first embodiment and the refrigerant circuit systems 10d and 10e shown in the second embodiment. The indoor units 1, 1b, 1c of each refrigerant circuit system 10a, 10b, 10d, 10e are installed in the room 5 in the vicinity of the heat generating devices 4a, 4b, and the indoor unit blowing means 16, 16b, 16c are provided respectively. Has been. In addition, this air conditioning system includes a space detection unit 40 that detects a space with a high latent heat load in the room 5 based on detection temperatures and detection humidity by the three temperature and humidity detection units 51a, 51b, and 51c, and a space detection unit 40. Indoor unit control means 41 (third control means) for causing the refrigerant circuit systems 10a, 10b, 10d, and 10e having the indoor heat exchangers 12, 14, 12b, and 12c close to the detection space to perform a predetermined dehumidifying operation. ing. The temperature / humidity detection means 51, the space detection means 40, the indoor unit control means 41, and the indoor unit control means (not shown) of the indoor units 1, 1 b, 1 c are connected for communication via the communication means 17. The indoor unit control means of the indoor units 1, 1b, 1c are connected to the outdoor unit control means (not shown) of the outdoor units 2, 3, 2b, 2c via communication means (not shown).
[0024]
Therefore, even when outside air with high humidity is taken into the room 5 by driving the ventilation means 52a and 52b, the temperature and humidity detection means 51a, 51b and 51c and the space detection means 40 are used to create a space where the latent heat load is determined to be high. The refrigerant circuit systems 10a, 10b, 10d, and 10e having the nearby indoor heat exchangers 12, 14, 12b, and 12c temporarily lower the evaporation temperature of the indoor heat exchanger below the dew point of the indoor air than during normal operation. The predetermined dehumidifying operation is performed to maintain the temperature and humidity in the room 5 in an appropriate state. Thereby, even if the latent heat load brought into the room 5 from outside or the like is biased to a part of the space, the latent heat load in the space can be appropriately processed.
[0025]
Embodiment 4 FIG.
Embodiment 4 according to the present invention will be described below. The air conditioning system according to this embodiment is almost the same as the configuration of the third embodiment shown in FIG. However, priority is given to either the sensible heat removal operation or the latent heat load removal operation based on the temperature difference between the temperature detected by the temperature / humidity detection means 51a, 51b, 51c and the set target temperature and the humidity difference between the detected humidity and the set target humidity. The indoor unit control means 41 has a function of a priority operation determination means for determining whether to perform the operation and a function of a fourth control means for performing a predetermined dehumidifying operation while giving priority to the operation determined by the priority operation determination means. There is a feature in the point.
[0026]
In this case, if all the relative humidity detected by the temperature / humidity detecting means 51a, 51b, 51c is 90%, for example, the dehumidifying operation is temporarily performed in all the indoor units 1, 1b, 1c, and 75-90%, 60 A predetermined dehumidifying operation is performed by changing the number of operating systems of the refrigerant circuit systems 10a, 10b, 10d, and 10e in stages such as -75% and 50-60%. At this time, priority is given to dehumidifying operation, but in order not to raise the room temperature too much, priority is given to operation that deviates significantly from the set target range of both (temperature or humidity). Thereby, both latent heat and sensible heat load can be processed efficiently.
For example, if the set target range of the indoor temperature is 20 to 25 ° C. and the set target range of the indoor relative humidity is 20 to 50%, the priority operation is performed when the detected temperature is 28 ° C. and the detected humidity is 40%. It is determined by the function of the determination means that the sensible heat load removal operation is prioritized, and a predetermined dehumidification operation is performed in another refrigerant circuit system while giving priority to the sensible heat load removal operation by a certain refrigerant circuit system. Therefore, even when the latent heat load and the sensible heat load are large, it is possible to preferentially process either one. For example, when both are out of the set target range such that the detected temperature is 28 ° C. and the detected humidity is 80%, this example is used to suppress the greater degree of deviation (humidity in this example). Then, the sensible heat load removal operation is performed in another refrigerant circuit system while giving priority to the dehumidification operation.
[0027]
In addition, with respect to the configuration of the third embodiment, the function of the system priority order assigning unit that prioritizes each refrigerant circuit system 10a, 10b, 10d, 10e based on the humidity detected by the temperature / humidity detection units 51a, 51b, 51c, The function of the 5th control means which makes each refrigerant circuit system 10a, 10b, 10d, 10e perform predetermined dehumidification operation according to the priority given by this system priority order grant means is added to indoor unit control means 41. Also good.
[0028]
The functions of the indoor unit control means 15, 15a, 15b, 15c, 41, the space detection means 40, or the outdoor unit control means 25, 35 described so far are not particularly limited. This is realized by a memory combination configuration.
[0029]
【The invention's effect】
As described above in detail, according to the present invention, among the plurality of refrigerant circuit systems, according to the detected indoor temperature and indoor humidity. , Some Dehumidification operation by temporarily setting the evaporation temperature of the refrigerant in the indoor heat exchanger of the refrigerant circuit system below the dew point of the indoor air However, if it is judged that the dehumidifying capacity is insufficient, the refrigerant evaporating temperature in the indoor heat exchanger is temporarily set below the dew point of the indoor air for other refrigerant circuit systems. Therefore, sensible heat removal operation as well as latent heat removal operation can be performed at the same time. Therefore, it is difficult for the entire system to fall into a sensible heat capacity shortage. Further, even when one refrigerant circuit system fails, the remaining temperature and humidity can be maintained in an appropriate state by the remaining refrigerant circuit system. Further, even if the indoor latent heat load or sensible heat load changes suddenly due to the introduction of outside air or sudden heat generation from the heat generating device, each load can be appropriately tracked and processed. On the other hand, when it is configured so that all the indoor heat exchangers of a plurality of refrigerant circuit systems are ventilated with one air blowing means and blown indoors, compared to the case where the air blowing means is individually provided for each indoor heat exchanger The entire system can be made compact.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of an air-conditioning system according to Embodiment 1 of the present invention.
FIG. 2 is a configuration diagram of an air conditioning system according to Embodiment 2 of the present invention.
FIG. 3 is a configuration diagram of an air-conditioning system according to Embodiment 3 of the present invention.
FIG. 4 is a front configuration diagram of an air conditioning system according to a conventional technique.
FIG. 5 is a plan configuration diagram of the air conditioning system according to the related art.
FIG. 6 is a side configuration diagram of the air conditioning system according to the related art.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Indoor unit, 1a Indoor unit, 1b Indoor unit, 1c Indoor unit, 2 Outdoor unit, 2a Outdoor unit, 2b Outdoor unit, 2c Outdoor unit, 3 Outdoor unit, 4, 4a, 4b Heat generating device, 5 Room, 10, 10a , 10b, 10c, 10d, 10e Refrigerant circuit system, 11, 11a, 11b, 11c, 13 Expansion valve, 12, 12a, 12b, 12c, 14 Indoor heat exchanger, 15, 15a, 15b, 15c Indoor unit control means, 16, 16a, 16b, 16c Indoor unit ventilation means, 21 compressor, 22 outdoor heat exchanger, 23 refrigerant pipe, 31 compressor, 32 outdoor heat exchanger, 33 refrigerant pipe, 51, 51a, 51b, 51c Temperature / humidity detection means.

Claims

An air conditioning system that cools a room in which a heating device is installed,
A first refrigerant circuit system configured by sequentially connecting a first compressor capable of capacity control, a first outdoor heat exchanger, a first expansion valve, and a first indoor heat exchanger;
Other compressors capable of capacity control, other outdoor heat exchangers, other expansion valves, and other indoor heat exchangers installed in the same room where the first indoor heat exchanger is installed With other refrigerant circuit systems configured to connect,
A first air blowing unit capable of variable air volume control for ventilating the first indoor heat exchanger and the other indoor heat exchanger and blowing into the room;
Temperature and humidity detection means for detecting the temperature and humidity in the room;
One refrigerant circuit system is controlled by controlling the first or other compressor, the first or other expansion valve, or the first blowing means based on the temperature and humidity detected by the temperature and humidity detecting means. If the evaporation temperature of the refrigerant in the indoor heat exchanger is temporarily set below the dew point of the room air and it is determined that the dehumidifying capacity is insufficient, the evaporation temperature of the refrigerant in the indoor heat exchanger of the other refrigerant circuit system is temporarily And a first control means for performing a predetermined dehumidifying operation to bring the dew point of the room air below the dew point .

An air conditioning system that cools a room in which a heating device is installed,
A first refrigerant circuit system configured by sequentially connecting a first compressor capable of capacity control, a first outdoor heat exchanger, a first expansion valve, and a first indoor heat exchanger;
Other compressors capable of capacity control, other outdoor heat exchangers, other expansion valves, and other indoor heat exchangers installed in the same room where the first indoor heat exchanger is installed With other refrigerant circuit systems configured to connect,
A second air blowing means capable of controlling the variable air volume for passing air through the first indoor heat exchanger and blowing air into the room;
A third air blowing means capable of variable air volume control for ventilating the other indoor heat exchanger and blowing air into the room;
Temperature and humidity detection means for detecting the temperature and humidity in the room;
By controlling the first or other compressor, the first or other expansion valve, or the second or third blowing means based on the temperature and humidity detected by the temperature and humidity detecting means , When the evaporation temperature of the refrigerant in the indoor heat exchanger of the refrigerant circuit system is temporarily made lower than the dew point of the indoor air and it is determined that the dehumidifying capacity is insufficient, the evaporation of the refrigerant in the indoor heat exchanger of the other refrigerant circuit system And an air conditioning system characterized by comprising a second control means for performing a predetermined dehumidifying operation for temporarily setting the temperature below the dew point of room air .

Priority operation determination means for determining whether to prioritize the sensible heat load removal operation or the latent heat load removal operation based on the detected temperature and detected humidity detected by the temperature and humidity detection means, the set target temperature, and the set target humidity. The air conditioning system according to claim 1, wherein the air conditioning system is provided.

Based on the temperature and humidity detected by the temperature and humidity detection means provided at a plurality of locations in the room, further comprising space detection means for detecting a space with a high latent heat load in the room,
The evaporating temperature of the refrigerant in the indoor heat exchanger at a position close to the space detected by the space detecting means is temporarily set to be lower than the dew point of indoor air. Air conditioning system.