JP3735745B2 - Cooling operation control method for absorption air conditioner - Google Patents

Cooling operation control method for absorption air conditioner Download PDF

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JP3735745B2
JP3735745B2 JP03519397A JP3519397A JP3735745B2 JP 3735745 B2 JP3735745 B2 JP 3735745B2 JP 03519397 A JP03519397 A JP 03519397A JP 3519397 A JP3519397 A JP 3519397A JP 3735745 B2 JP3735745 B2 JP 3735745B2
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liquid refrigerant
refrigerant
liquid
cooling operation
pipe
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JPH10232064A (en
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清春 曽根
徹 柳澤
昇 小林
和哉 今井
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Osaka Gas Co Ltd
Yazaki Corp
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Osaka Gas Co Ltd
Yazaki Corp
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A30/00—Adapting or protecting infrastructure or their operation
    • Y02A30/27—Relating to heating, ventilation or air conditioning [HVAC] technologies
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/62—Absorption based systems

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  • Sorption Type Refrigeration Machines (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は、吸収式冷暖房装置の冷房運転制御方法に係り、特に室内機への２次側冷媒の供給制御方法に関するものである。
【０００２】
【従来の技術】
図４は、吸収式冷暖房装置内に設けられた２次側循環回路を示す系統図である。２次側循環回路２において、冷房運転時、室内機側より冷媒ガス管１８を介して冷媒ガス２９が蒸発器の蒸発器コイル４に導入され、冷却、凝縮して液冷媒３０となり、吸込管路１１に導かれる。吸込管路１１に接続されたレシーバタンク１４内にはフロートスイッチ１５が設けられ、レシーバタンク１４内に液が溜るとフロートスイッチ１５が作動し液レベル信号がコントローラ２５に入力され、搬送補助装置であるブースター１０に起動信号を送りブースター１０が起動（ＯＮ）され、吐出管路１２より液冷媒が液冷媒管１９へ圧送される。この時、暖房弁２３は閉となっており、、吸込管路１１へバイパスすることはない。
【０００３】
暖房運転時は、ブースター１０は停止し、暖房弁２３は開となる。暖房運転時は２次側冷媒の流れ方向が逆となり、液冷媒管１９より液冷媒３０が導かれ暖房弁２３を経て蒸発器コイル４で加温され、冷媒ガス２９となって冷媒ガス管１８を通り室内機に供給される。尚、符号８は吸収式冷暖房装置、２２は流路を示す。
【０００４】
図５は、従来技術に係る吸収式冷暖房装置の冷房運転制御方法の系統図である。先ずスタート指令１００により冷房か暖房かの判断１０１を行なう。冷房運転の場合は、暖房弁閉１０２で暖房弁の閉が行なわれる。冷房か暖房かの判断１０１で暖房運転の場合は、暖房弁開１０６で暖房弁の開が行なわれブースターＯＦＦ１０７でブースターの停止が行なわれる。
【０００５】
次に、暖房弁の閉が行なわれると、フロートスィッチ液レベルの判定１０３で所定の滞留量ｍ0（又は所定の高さｈ0）以上の場合はブースターＯＮ１０４でブースターの起動が行なわれ、フロートスィッチ液レベルの判定１０３の前に戻る。一方、フロートスィッチ液レベルの判定１０３で所定の滞留量ｍ0（又は所定の高さｈ0）未満の場合はブースターＯＦＦ１０５でブースターの停止が行なわれ、同じくフロートスィッチ液レベルの判定１０３の前に戻る。
【０００６】
【発明が解決しようとする課題】
しかしながら、ブースター１０が起動（ＯＮ）し、吐出管路１２より液冷媒を液冷媒管１９へ圧送すると、レシーバタンク１４内の液量が減少し、フロートスイッチ１５が予め設定された液冷媒の所定の滞留量ｍ0を検知し、ブースター１０は停止する。しかし、この時、液冷媒供給量が急減し、２次側室内機への供給量が減るため、室内機の大幅な出力低下を起こし室内の不快感を生じる。
【０００７】
図６は、図５の冷房運転制御方法による時間と液冷媒供給量の関係の線図である。図６に示すように、従来の制御ではブースター１０が起動すると、区間ｔ101〜ｔ102、ｔ103〜ｔ104、ｔ105〜ｔ106の間は液冷媒を安定的に供給するが、区間ｔ100〜ｔ101、ｔ102〜ｔ103、ｔ104〜ｔ105の間は液冷媒供給量Ｖ100が小さくなり、急減し、室内機に十分な安定的した液冷媒を供給することが困難である。
【０００８】
本発明の課題は、冷媒及び吸収溶液の１次側循環回路を形成し、冷暖房のための２次側冷媒の加熱又は冷却を行なう吸収式冷暖房装置の冷房運転制御方法において、蒸発器の液側から液冷媒管側に送られる２次側液冷媒の送り出しを停止した時に、室内機側への液冷媒の供給量をコストアップなしに平準化し、室内の快適環境を維持することである。
【０００９】
【課題を解決するための手段】
上記課題を解決するため本発明は、高温再生器、低温再生器、凝縮器、蒸発器及び吸収器等を接続して冷媒及び吸収溶液の１次側循環回路を形成し、冷房運転時に室内機から冷媒ガス管を介して戻ってきた冷媒ガスを前記蒸発器によって冷却、凝縮させてレシーバタンクに溜め、前記レシーバタンク内の液冷媒を液冷媒搬送装置によって液冷媒管を介して前記室内機に供給する２次側循環回路を形成した吸収式冷暖房装置の冷房運転制御方法において、冷房運転時に、前記レシーバタンク内の液冷媒が所定の滞留量より少なくなって前記液冷媒搬送装置が停止された際に、前記蒸発器の液側と前記液冷媒管側との間に設けた弁を開いて液冷媒を前記室内機に供給することである。
【００１０】
すなわち、液冷媒搬送装置が停止された際に、蒸発器の液側から液ヘッド圧によって液冷媒を送ることができ、室内機側への液冷媒の供給量を平準化し、室内の快適環境を維持する。
【００１２】
【発明の実施の形態】
以下に、本発明に係る吸収式冷暖房装置の実施の形態を図面に基づいて説明する。
【００１３】
図３は、吸収式冷暖房装置の全体回路の系統図である。この吸収式冷暖房装置１は、冷却水管８０ａ、８０ｂで接続され冷却水を冷却しファン８２を有するクーリングタワー８１と、この吸収式冷暖房装置１に冷媒ガス管１８及び液冷媒管１９で接続され空調対象空間に配置されて該空間の空気との熱交換を行う図示されていない空調用室内機とが付設されている。又、冷却水管８０ｂには、冷却水をクーリングタワー８１から吸収式冷暖房装置１に循環させる冷却水循環ポンプ７３が介装され、更に、２次側液冷媒管１９に介装され、冷媒ガス管１８及び液冷媒管１９内の２次側冷媒を吸収式冷暖房装置１と前記空調用室内機の間で循環させる図示していない２次側冷媒循環ポンプが付設されている。
【００１４】
前記空調用室内機に対して、クーリングタワー８１と併せて通常、室外機と呼ばれる吸収式冷暖房装置１は、この場合燃料をバーナで燃焼させ、その燃焼熱で希溶液を加熱する加熱源４７を有する高温再生器４６と、この高温再生器４６で加熱された希溶液から冷媒蒸気と中間濃溶液を分離する分離器４９と、分離された冷媒蒸気を熱源として前記中間濃溶液を加熱してさらに冷媒蒸気を発生させる低温再生器５０と、この低温再生器５０を通過した冷媒蒸気及び低温再生器５０で発生した冷媒蒸気を冷却して凝縮し液化させ液冷媒を生成する凝縮器５１と、この凝縮器５１で生成された液冷媒を内装した冷媒分配器５４から同じく内装した蒸発コイル４上に滴下、蒸発させ、この蒸発コイル４中の２次側冷媒を冷却する蒸発器５３とを有する。
【００１５】
更に、吸収式冷暖房装置１は、上記蒸発器５３で蒸発した冷媒蒸気を濃溶液に吸収させ希溶液を生成する吸収器５２と、この希溶液を加圧し低温溶液熱交換器５７、高温溶液熱交換器５６の被加熱流体側を経て高温再生器４６に送りこむ溶液循環ポンプ６０と、分離器４９の底部と蒸発器５３の底部を冷暖切換弁６１を介して連通する管路６２と、低温溶液熱交換器５７の加熱流体出側を吸収器５２の上部に接続する濃溶液管５８と、この濃溶液管５８と吸収器５２の下部を溶液バイパス弁７０を介して接続する管路７１と、濃溶液管５８と蒸発器５３に内装された冷媒分配器５４を凍結防止弁６７を介して連通する管路６８と、凝縮器５１から冷媒分配器５４に液冷媒を導く水冷媒管６６と、この水冷媒管６６に並列に接続され水冷媒比例弁６４を介装する管路６５とを含んで構成されている。
【００１６】
そして、上記分離器４９で分離された中間濃溶液が高温溶液熱交換器５６の加熱流体側を経て低温再生器５０に導かれ、低温再生器５０で冷媒を蒸発させて濃溶液となったのち、低温溶液熱交換器５７の加熱流体側を経て濃溶液管５８に導かれるように管路が構成されている。吸収器５２及び凝縮器５１にはそれぞれ冷却水コイルが内装され、吸収器５２の冷却水コイルの出口は凝縮器５１の冷却水コイルの入口に接続されていて、吸収器５２の冷却水コイルの入口は冷却水管８０ｂに、凝縮器５１の冷却水コイルの出口は冷却水管８０ａに、それぞれ接続されている。２次側冷媒の液冷媒管１９は蒸発コイル４の液側に、２次側冷媒の冷媒ガス管１８は蒸発コイル４のガス側にそれぞれ接続されている。
【００１７】
上記構成の装置において、冷暖切換弁６１は、冷房と暖房の切り替えを行なうもので、冷房時は閉、暖房時は開とされる。水冷媒比例弁６４は、蒸発器５３の温度（蒸発器温度センサの出力）を入力として開度制御され、溶液濃度の調整を行なう弁である。凍結防止弁６７は、蒸発温度が低下して１℃になれば開いて濃溶液を冷媒分配器５４に流入させ、冷媒（吸収式冷暖房装置の冷媒には通常水が使用される。以下、水冷媒ともいう）の凍結を防ぐ弁である。溶液バイパス弁７０は、冷房立上り時及び低負荷運転時に、蒸発器温度が低下したとき、凍結防止弁６７が作動する前に濃溶液を吸収器５２の下部にバイパスして吸収器５２の吸収能力を低下させ、蒸発器５３のそれ以上の温度低下を防ぐためのオン−オフ制御弁である。
【００１８】
図３において、２次側循環回路２については先の図４において説明したが、この２次側循環回路２は、図３の蒸発器５３で凝縮した液冷媒３０を液冷媒管１９に戻し室内機に再び供給する液冷媒搬送装置或いは液冷媒戻し手段であるブースター１０を有している。
【００１９】
上記構成を有する吸収式冷暖房装置１において、本実施の形態の冷房運転制御方法は、図４に示すように、蒸発器の液側５から２次側液冷媒３０を供給する液冷媒管１９側に送られる液冷媒３０の送り出しをブースター１０を止めることによって停止し、２次側液冷媒３０が所定の滞留量（ｍ0）より少ない時に、蒸発器の液側５と液冷媒管１９側との間に設けられ、暖房運転時に液冷媒管１９側から蒸発器の液側５に通ずるバイパス流路である流路２２の途中に設けられた暖房弁２３を開くことである。
【００２０】
図１は、上記冷房運転制御方法を線図で示した系統図である。先ずスタート指令３３により冷房か暖房かの判断３４を行なう。冷房運転の場合は、暖房弁閉３５で暖房弁の閉が行なわれる。冷房か暖房かの判断３４で暖房運転の場合は、暖房弁開４０で暖房弁の開が行なわれブースターＯＦＦ４１でブースターの停止が行なわれる。
【００２１】
次に、暖房弁の閉が行なわれると、フロートスィッチ液レベルの判定３６に移り、フロートスィッチ液レベルの判定３６で所定の滞留量ｍ0（又は所定の高さｈ0）以上の場合はブースターＯＮ３７でブースターの起動を行ない、暖房弁閉３５の前に戻る。一方、フロートスィッチ液レベルの判定３６で所定の滞留量ｍ0（又は所定の高さｈ0）より少ない時にブースターＯＦＦ３８でブースターの停止を行ない、暖房弁開３９で暖房弁を開きフロートスィッチ液レベルの判定３６の前に戻る。
【００２２】
上記冷房運転制御方法は、２次側液冷媒３０が所定の滞留量（ｍ0）より少なく、且つ蒸発器の液側５から液冷媒管１９側に送られる液冷媒３０の送り出しを停止した時に、流路２２の途中に設けられた暖房弁２３を開くことにより、従来は流路が狭いブースター内（ブースター自体は停止しているが内部を液冷媒３０が通るのは可能）を液ヘッド圧のみで液冷媒管１９へ送っていただけであったが、本実施の形態では、この流路２２及び今まで送り出しをした流路（吸込管路１１及び吐出管路１２）の両方によって液ヘッド圧によって送ることが出来、しかも流路はより広くなるので液冷媒の供給量も増加する。しかし、ブースター１０の供給量ほど多くないので、徐々にレシーバタンク１４内に液がたまり、室内機側への液冷媒３０の供給量を平準化し、液冷媒の供給量を大きく低下させないで室内の快適環境を維持する。
【００２３】
更に、新たにバイパス流路を設けてバイパスさせることなく、コストアップなしに室内機側への液冷媒の供給量を平準化することが出来る。又、２次側液冷媒３０が所定の滞留量（ｍ0）より少ない時には、液冷媒管１９への供給量よりも蒸発器コイル４から流入する液冷媒の方が多いので徐々に液冷媒が溜り、所定の滞留量（ｍ0）に達した時点で再び十分な安定した液冷媒の供給をすることが出来る。この時、暖房弁２３は再び閉となり、吸込管路１１への液冷媒のバイパスは防止される。
【００２４】
図２は、図１の冷房運転制御方法による時間と液冷媒供給量の関係の線図である。この図から分かるように、時間当りの供給量自体は変らないが、区間ｔ0〜ｔ1、ｔ2〜ｔ3、ｔ4〜ｔ5においては液冷媒供給量Ｖ1（単位時間当り供給量）が図６に示した液冷媒供給量Ｖ100に比べ大きくなり、供給量の平準化が成され、２次側室内機への冷媒供給量が安定し、室内の快適性を保つ。
【００２５】
尚、上記実施の形態の冷房運転制御方法は、水冷の吸収式冷暖房装置に適用した場合について説明したが、本発明はこれに限定されず、空冷の吸収式冷暖房装置に対しても適用出来ることは勿論である。更に、高温再生器の加熱源は、バーナによる燃焼加熱の他に、排蒸気又は排温水による加熱、電気ヒータによる加熱等が利用出来る。更に、２次側冷媒は、相変化するフロン（ＨＦＣ−１３４ａ）を使用しているが、この他にアルコール、水と潜熱剤の混合物等が使用出来る。
【００２６】
【発明の効果】
本発明の吸収式冷暖房装置の冷房運転制御方法によれば、蒸発器の液側から液冷媒管側に送られる２次側液冷媒の送り出しを停止した時に、室内機側への液冷媒の供給量をコストアップなしに平準化することが出来、室内の快適環境を維持することが出来る。
【図面の簡単な説明】
【図１】本発明に係る吸収式冷暖房装置の冷房運転制御方法の一実施の形態を線図で示した系統図である。
【図２】図１の冷房運転制御方法による時間と液冷媒供給量の関係の線図である。
【図３】吸収式冷暖房装置の全体回路の系統図である。
【図４】図３の吸収式冷暖房装置内に設けられた２次側循環回路を示す系統図である。
【図５】従来技術に係る吸収式冷暖房装置の冷房運転制御方法の系統図である。
【図６】図５の冷房運転制御方法による時間と液冷媒供給量の関係の線図である。
【符号の説明】
１ 吸収式冷暖房装置
５ 液側
１０ ブースター
１９ 液冷媒管
２２ 流路（バイパス流路）
２３ 暖房弁
２８ ２次側冷媒
３０ ２次側液冷媒
４４ １次側循環回路
５３ 蒸発器
ｍ0 所定の滞留量[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cooling operation control method for an absorption air conditioner, and more particularly, to a secondary side refrigerant supply control method for an indoor unit.
[0002]
[Prior art]
FIG. 4 is a system diagram showing a secondary side circulation circuit provided in the absorption type air conditioner. In the secondary side circulation circuit 2, during the cooling operation, the refrigerant gas 29 is introduced into the evaporator coil 4 of the evaporator from the indoor unit side via the refrigerant gas pipe 18, cooled and condensed to become the liquid refrigerant 30, and the suction pipe It is led to the path 11. A float switch 15 is provided in the receiver tank 14 connected to the suction pipe 11, and when the liquid accumulates in the receiver tank 14, the float switch 15 is activated and a liquid level signal is input to the controller 25, and the transfer assist device An activation signal is sent to a certain booster 10, the booster 10 is activated (ON), and the liquid refrigerant is pressure-fed from the discharge pipe 12 to the liquid refrigerant pipe 19. At this time, the heating valve 23 is closed and is not bypassed to the suction pipe 11.
[0003]
During the heating operation, the booster 10 is stopped and the heating valve 23 is opened. During the heating operation, the flow direction of the secondary refrigerant is reversed, the liquid refrigerant 30 is guided from the liquid refrigerant pipe 19, is heated by the evaporator coil 4 through the heating valve 23, becomes the refrigerant gas 29, and the refrigerant gas pipe 18. Is supplied to the indoor unit. In addition, the code | symbol 8 shows an absorption-type air conditioning apparatus, 22 shows a flow path.
[0004]
FIG. 5 is a system diagram of a cooling operation control method for an absorption air-conditioning apparatus according to the prior art. First, it is determined 101 whether cooling or heating based on the start command 100. In the case of the cooling operation, the heating valve is closed by the heating valve closing 102. In the case of the heating operation by the determination 101 of cooling or heating, the heating valve is opened by opening the heating valve 106 and the booster is stopped by booster OFF107.
[0005]
Next, when the heating valve is closed, when the float switch liquid level determination 103 is greater than or equal to a predetermined retention amount m 0 (or a predetermined height h 0 ), the booster is activated by the booster ON 104, and the float Return to before the switch liquid level determination 103. On the other hand, when the float switch liquid level determination 103 is less than the predetermined retention amount m 0 (or the predetermined height h 0 ), the booster is stopped at the booster OFF 105, and before the float switch liquid level determination 103. Return.
[0006]
[Problems to be solved by the invention]
However, when the booster 10 is activated (ON) and the liquid refrigerant is pumped from the discharge pipe 12 to the liquid refrigerant pipe 19, the amount of liquid in the receiver tank 14 decreases, and the float switch 15 is set to a predetermined liquid refrigerant predetermined value. detecting the holdup m 0, the booster 10 is stopped. However, at this time, the supply amount of the liquid refrigerant is drastically reduced and the supply amount to the secondary side indoor unit is reduced, so that the output of the indoor unit is greatly reduced, resulting in indoor discomfort.
[0007]
6 is a diagram of the relationship between the time and the liquid refrigerant supply amount according to the cooling operation control method of FIG. As shown in FIG. 6, when the conventional control the booster 10 is activated during the interval t 101 ~t 102, t 103 ~t 104, t 105 ~t 106 is stably supplying liquid refrigerant, the interval t 100 ~t 101, t 102 ~t 103 , between t 104 ~t 105 decreases the liquid refrigerant supply amount V 100, it decreases rapidly, it is difficult to supply a sufficient stable beneath liquid refrigerant to the indoor unit .
[0008]
An object of the present invention is to provide a cooling-side operation control method for an absorption-type air-conditioning apparatus that forms a primary-side circulation circuit for a refrigerant and an absorbing solution and heats or cools a secondary-side refrigerant for cooling and heating. When the delivery of the secondary side liquid refrigerant sent from the liquid refrigerant pipe to the liquid refrigerant pipe side is stopped, the supply amount of the liquid refrigerant to the indoor unit side is leveled without increasing the cost, and the indoor comfortable environment is maintained.
[0009]
[Means for Solving the Problems]
The present invention for solving the above problems, the high-temperature regenerator, a low temperature regenerator, a condenser, an evaporator and connect the absorber or the like to form a primary circulation circuit of the refrigerant and the absorbent solution, the indoor unit during the cooling operation The refrigerant gas returned from the refrigerant gas pipe is cooled and condensed by the evaporator and accumulated in the receiver tank, and the liquid refrigerant in the receiver tank is transferred to the indoor unit by the liquid refrigerant conveyance device via the liquid refrigerant pipe. In the cooling operation control method of the absorption-type air conditioner in which the secondary circulation circuit to be supplied is formed , the liquid refrigerant in the receiver tank is less than a predetermined retention amount and the liquid refrigerant transfer device is stopped during the cooling operation. At this time, a valve provided between the liquid side of the evaporator and the liquid refrigerant pipe side is opened to supply liquid refrigerant to the indoor unit .
[0010]
That is, when the liquid refrigerant transfer device is stopped, the liquid refrigerant can be sent from the liquid side of the evaporator by the liquid head pressure, and the amount of liquid refrigerant supplied to the indoor unit side is leveled, thereby improving the indoor comfortable environment. maintain.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EMBODIMENTS Embodiments of an absorption type air conditioner according to the present invention will be described below with reference to the drawings.
[0013]
FIG. 3 is a system diagram of the entire circuit of the absorption type air conditioner. This absorption type air conditioner 1 is connected with cooling water pipes 80a and 80b to cool the cooling water and has a fan 82, and is connected to the absorption type air conditioning apparatus 1 with a refrigerant gas pipe 18 and a liquid refrigerant pipe 19 for air conditioning. An air conditioning indoor unit (not shown) that is disposed in the space and performs heat exchange with the air in the space is attached. The cooling water pipe 80b is provided with a cooling water circulation pump 73 that circulates the cooling water from the cooling tower 81 to the absorption-type air conditioner 1. Further, the cooling water pipe 80b is provided in the secondary liquid refrigerant pipe 19, and the refrigerant gas pipe 18 and A secondary side refrigerant circulation pump (not shown) for circulating the secondary side refrigerant in the liquid refrigerant pipe 19 between the absorption air conditioner 1 and the indoor unit for air conditioning is attached.
[0014]
In this case, the absorption-type air conditioner 1 that is usually called an outdoor unit together with the cooling tower 81 has a heating source 47 that burns fuel with a burner and heats the diluted solution with the combustion heat. A high-temperature regenerator 46, a separator 49 for separating the refrigerant vapor and the intermediate concentrated solution from the diluted solution heated by the high-temperature regenerator 46, and further heating the intermediate concentrated solution using the separated refrigerant vapor as a heat source to further cool the refrigerant. A low-temperature regenerator 50 that generates steam, a refrigerant vapor that has passed through the low-temperature regenerator 50 and a refrigerant vapor generated in the low-temperature regenerator 50 are cooled, condensed, and liquefied to generate liquid refrigerant, and the condensation An evaporator 53 that cools the secondary refrigerant in the evaporation coil 4 by dropping and evaporating from the refrigerant distributor 54 having the liquid refrigerant generated in the evaporator 51 onto the evaporation coil 4 that is also installed. .
[0015]
Further, the absorption type air conditioner 1 absorbs the refrigerant vapor evaporated in the evaporator 53 into a concentrated solution to generate a diluted solution, pressurizes the diluted solution, and presses the diluted solution into a low-temperature solution heat exchanger 57 and a high-temperature solution heat. A solution circulation pump 60 fed to the high temperature regenerator 46 via the heated fluid side of the exchanger 56, a pipe 62 communicating the bottom of the separator 49 and the bottom of the evaporator 53 via a cooling / heating switching valve 61, and a low temperature solution A concentrated solution pipe 58 that connects the heated fluid outlet side of the heat exchanger 57 to the upper part of the absorber 52; a pipe line 71 that connects the concentrated solution pipe 58 and the lower part of the absorber 52 via a solution bypass valve 70; A conduit 68 communicating the concentrated solution pipe 58 and the refrigerant distributor 54 built in the evaporator 53 via an antifreezing valve 67; a water refrigerant pipe 66 for guiding the liquid refrigerant from the condenser 51 to the refrigerant distributor 54; A water refrigerant proportionally connected to the water refrigerant pipe 66 in parallel. It is configured to include a conduit 65 which is interposed a 64.
[0016]
Then, the intermediate concentrated solution separated by the separator 49 is led to the low temperature regenerator 50 through the heating fluid side of the high temperature solution heat exchanger 56, and after the refrigerant is evaporated by the low temperature regenerator 50, a concentrated solution is obtained. The pipe is configured to be led to the concentrated solution pipe 58 through the heating fluid side of the low-temperature solution heat exchanger 57. Each of the absorber 52 and the condenser 51 is provided with a cooling water coil, and the outlet of the cooling water coil of the absorber 52 is connected to the inlet of the cooling water coil of the condenser 51. The inlet is connected to the cooling water pipe 80b, and the outlet of the cooling water coil of the condenser 51 is connected to the cooling water pipe 80a. The secondary refrigerant liquid refrigerant pipe 19 is connected to the liquid side of the evaporation coil 4, and the secondary refrigerant refrigerant gas pipe 18 is connected to the gas side of the evaporation coil 4.
[0017]
In the apparatus having the above-described configuration, the cooling / heating switching valve 61 switches between cooling and heating, and is closed during cooling and opened during heating. The water refrigerant proportional valve 64 is a valve whose opening degree is controlled with the temperature of the evaporator 53 (output of the evaporator temperature sensor) as an input, and for adjusting the solution concentration. The anti-freezing valve 67 opens when the evaporation temperature falls to 1 ° C. and allows the concentrated solution to flow into the refrigerant distributor 54, and normal water is used as the refrigerant (the refrigerant of the absorption type air conditioner). This is a valve that prevents freezing of the refrigerant. The solution bypass valve 70 bypasses the concentrated solution to the lower part of the absorber 52 before the anti-freezing valve 67 operates when the evaporator temperature is lowered at the time of cooling start and during low load operation, and the absorption capacity of the absorber 52 This is an on-off control valve for reducing the temperature of the evaporator 53 and preventing further temperature drop of the evaporator 53.
[0018]
In FIG. 3, the secondary side circulation circuit 2 has been described with reference to FIG. 4. However, the secondary side circulation circuit 2 returns the liquid refrigerant 30 condensed by the evaporator 53 of FIG. It has a booster 10 which is a liquid refrigerant transfer device or a liquid refrigerant return means to be supplied again to the machine.
[0019]
In the absorption air conditioner 1 having the above-described configuration, the cooling operation control method according to the present embodiment is, as shown in FIG. 4, the liquid refrigerant pipe 19 side for supplying the secondary liquid refrigerant 30 from the liquid side 5 of the evaporator. When the booster 10 is stopped and the secondary liquid refrigerant 30 is less than the predetermined retention amount (m 0 ), the liquid side 5 of the evaporator and the liquid refrigerant pipe 19 side The heating valve 23 provided in the middle of the flow path 22 which is a bypass flow path provided between the liquid refrigerant pipe 19 side and the liquid side 5 of the evaporator during heating operation is opened.
[0020]
FIG. 1 is a system diagram schematically showing the cooling operation control method. First, the start command 33 determines 34 whether the cooling or heating. In the case of the cooling operation, the heating valve is closed by the heating valve closing 35. In the case of the heating operation based on the judgment 34 for cooling or heating, the heating valve is opened by opening the heating valve 40 and the booster is stopped by booster OFF41.
[0021]
Next, when the heating valve is closed, the process proceeds to the determination 36 of the float switch liquid level. If the determination 36 of the float switch liquid level is equal to or greater than a predetermined residence amount m 0 (or a predetermined height h 0 ), the booster The booster is activated at ON 37 and returns to the state before the heating valve closing 35. On the other hand, when the float switch liquid level determination 36 is smaller than the predetermined retention amount m 0 (or a predetermined height h 0 ), the booster is stopped with the booster OFF 38, the heating valve is opened with the heating valve open 39, and the float switch liquid level is set. Return to before the determination 36.
[0022]
In the cooling operation control method, when the secondary liquid refrigerant 30 is less than the predetermined retention amount (m 0 ) and the delivery of the liquid refrigerant 30 sent from the liquid side 5 of the evaporator to the liquid refrigerant pipe 19 side is stopped. By opening the heating valve 23 provided in the middle of the flow path 22, the liquid head pressure in the booster having a narrow flow path (the liquid refrigerant 30 can pass through the booster itself is stopped). However, in the present embodiment, the liquid head pressure is increased by both the flow path 22 and the flow paths (the suction pipe line 11 and the discharge pipe line 12) that have been sent so far. Moreover, since the flow path becomes wider, the supply amount of the liquid refrigerant also increases. However, since the supply amount of the booster 10 is not so large, the liquid gradually accumulates in the receiver tank 14, leveling the supply amount of the liquid refrigerant 30 to the indoor unit side, and greatly reducing the supply amount of the liquid refrigerant without reducing the supply amount of the liquid refrigerant Maintain a comfortable environment.
[0023]
Furthermore, the supply amount of the liquid refrigerant to the indoor unit side can be leveled without increasing the cost without newly providing a bypass flow path for bypassing. Further, when the secondary liquid refrigerant 30 is smaller than the predetermined retention amount (m 0 ), the liquid refrigerant flowing from the evaporator coil 4 is larger than the supply amount to the liquid refrigerant pipe 19, so that the liquid refrigerant gradually increases. When the liquid has accumulated and reaches a predetermined retention amount (m 0 ), a sufficiently stable liquid refrigerant can be supplied again. At this time, the heating valve 23 is closed again, and the bypass of the liquid refrigerant to the suction pipe 11 is prevented.
[0024]
FIG. 2 is a diagram of the relationship between the time and the liquid refrigerant supply amount according to the cooling operation control method of FIG. As can be seen from this figure, the supply amount per hour itself does not change, but in the sections t 0 to t 1 , t 2 to t 3 , and t 4 to t 5 , the liquid refrigerant supply amount V 1 (supply amount per unit time) ) Becomes larger than the liquid refrigerant supply amount V 100 shown in FIG. 6, the supply amount is leveled, the refrigerant supply amount to the secondary side indoor unit is stabilized, and indoor comfort is maintained.
[0025]
In addition, although the cooling operation control method of the said embodiment demonstrated the case where it applied to the water-cooled absorption-type air conditioning apparatus, this invention is not limited to this, It can apply also to an air-cooled absorption-type air conditioning apparatus. Of course. Furthermore, as a heating source of the high-temperature regenerator, heating by exhaust steam or exhaust hot water, heating by an electric heater, or the like can be used in addition to combustion heating by a burner. Furthermore, although the refrigerant | coolant (HFC-134a) which changes a phase is used for the secondary side refrigerant | coolant, alcohol, the mixture of water and a latent heat agent, etc. can be used besides this.
[0026]
【The invention's effect】
According to the cooling operation control method of the absorption type air conditioning apparatus of the present invention, when the delivery of the secondary liquid refrigerant sent from the liquid side of the evaporator to the liquid refrigerant pipe side is stopped, the liquid refrigerant is supplied to the indoor unit side. The amount can be leveled without increasing the cost, and a comfortable indoor environment can be maintained.
[Brief description of the drawings]
FIG. 1 is a system diagram schematically showing an embodiment of a cooling operation control method for an absorption air conditioner according to the present invention.
FIG. 2 is a diagram of the relationship between time and liquid refrigerant supply amount according to the cooling operation control method of FIG. 1;
FIG. 3 is a system diagram of an entire circuit of the absorption type air conditioner.
4 is a system diagram showing a secondary-side circulation circuit provided in the absorption type air conditioner of FIG. 3. FIG.
FIG. 5 is a system diagram of a cooling operation control method for an absorption air-conditioning apparatus according to the prior art.
6 is a diagram of the relationship between the time and the liquid refrigerant supply amount according to the cooling operation control method of FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Absorption type air conditioner 5 Liquid side 10 Booster 19 Liquid refrigerant pipe 22 Flow path (bypass flow path)
23 Heating valve 28 Secondary side refrigerant 30 Secondary side liquid refrigerant 44 Primary side circulation circuit 53 Evaporator m 0 Predetermined residence amount

Claims (1)

高温再生器、低温再生器、凝縮器、蒸発器及び吸収器等を接続して冷媒及び吸収溶液の１次側循環回路を形成し、冷房運転時に室内機から冷媒ガス管を介して戻ってきた冷媒ガスを前記蒸発器によって冷却、凝縮させてレシーバタンクに溜め、前記レシーバタンク内の液冷媒を液冷媒搬送装置によって液冷媒管を介して前記室内機に供給する２次側循環回路を形成した吸収式冷暖房装置の冷房運転制御方法において、冷房運転時に、前記レシーバタンク内の液冷媒が所定の滞留量より少なくなって前記液冷媒搬送装置が停止された際に、前記蒸発器の液側と前記液冷媒管側との間に設けた弁を開いて液冷媒を前記室内機に供給することを特徴とする吸収式冷暖房装置の冷房運転制御方法。A high-temperature regenerator, a low-temperature regenerator, a condenser, an evaporator, an absorber, and the like are connected to form a primary circulation circuit for the refrigerant and the absorbing solution, and returned from the indoor unit via the refrigerant gas pipe during the cooling operation. Refrigerant gas is cooled and condensed by the evaporator, accumulated in a receiver tank, and a secondary side circulation circuit is formed in which the liquid refrigerant in the receiver tank is supplied to the indoor unit via a liquid refrigerant pipe by a liquid refrigerant transfer device. In the cooling operation control method of the absorption type air conditioner, when the liquid refrigerant in the receiver tank is less than a predetermined retention amount and the liquid refrigerant transfer device is stopped during the cooling operation, the liquid side of the evaporator A cooling operation control method for an absorption type air conditioner , wherein a valve provided between the liquid refrigerant pipe side is opened and liquid refrigerant is supplied to the indoor unit .
JP03519397A 1997-02-19 1997-02-19 Cooling operation control method for absorption air conditioner Expired - Fee Related JP3735745B2 (en)

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JP03519397A JP3735745B2 (en) 1997-02-19 1997-02-19 Cooling operation control method for absorption air conditioner

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Application Number Priority Date Filing Date Title
JP03519397A JP3735745B2 (en) 1997-02-19 1997-02-19 Cooling operation control method for absorption air conditioner

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JP3735745B2 true JP3735745B2 (en) 2006-01-18

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JP4566919B2 (en) * 2006-01-24 2010-10-20 株式会社日本製鋼所 Double-effect absorption chill generation / output device

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