JP3913461B2

JP3913461B2 - Absorption chiller / heater

Info

Publication number: JP3913461B2
Application number: JP2000351266A
Authority: JP
Inventors: 伸浩出射
Original assignee: Sanyo Electric Co Ltd
Current assignee: Sanyo Electric Co Ltd
Priority date: 2000-11-17
Filing date: 2000-11-17
Publication date: 2007-05-09
Anticipated expiration: 2020-11-17
Also published as: JP2002156169A

Description

【０００１】
【発明の属する技術分野】
本発明は、吸収冷温水機に関するものである。
【０００２】
【従来の技術】
温度検出素子と、自らのＩＤコードを保有した記憶手段と、温度検出素子が計測した温度情報を取り込んで記憶手段に書き込み、この記憶手段に書き込んだ温度情報を外部に通信手段を介して伝達するセンサ側制御手段とを備えて構成される温度センサを吸収冷温水機の所用部分に設置すると共に、温度センサが計測した温度に基づいて吸収液や冷媒を循環させる循環手段などの各動作機能部分に制御信号を出力するようにした吸収冷温水機の制御装置を本出願人は既に特願平１１−１３６００２号に提案し、プラグインによる温度センサの配線を可能にし、それによって配線の簡素化を図ると共に、ソフトウエアの共通化によるコストの大幅な削減を既に達成した。
【０００３】
【発明が解決しようとする課題】
しかし、特願平１１−１３６００２号に提案した吸収冷温水機の制御装置においては、信号線によって接続した制御装置と温度センサ間の通信時にノイズが入って正常な通信が行えないことがあったので、通信異常が発生したときに的確な対処が自動的になされるようにする必要があり、その解決が課題となっていた。
【０００４】
【課題を解決するための手段】
本発明は上記従来技術の課題を解決するため、配管により連結した高温再生器、低温再生器、凝縮器、蒸発器、吸収器などに吸収液と冷媒とを循環させ、蒸発器の内部に設置した伝熱管内を通って冷却または加熱された熱操作流体を空調負荷に供給すると共に、制御手段を備えて各部に設置された温度センサと信号線を介して前記温度センサで検出される温度データを通信プロトコルにより制御装置へ収集して冷房運転または暖房運転を行う吸収冷温水機において、前記温度センサから送信される前記温度データが予め設定した温度の範囲から外れていることを判定する手段と、前記温度データが前記判定によって異常であると判定された場合、該当する温度センサのＡ／Ｄ変換器を初期状態に復帰させるための所用の制御信号を送信する手段と、前記所用の制御信号を送信しても前記温度センサから送信される前記温度データが予め設定した温度の範囲から外れている場合、当該温度センサに異常があると判定して管理者に異常を知らせる手段を前記制御装置に備えた第１の構成の吸収冷温水機と、
【０００５】
配管により連結した高温再生器、低温再生器、凝縮器、蒸発器、吸収器などに吸収液と冷媒とを循環させ、蒸発器の内部に設置した伝熱管内を通って冷却または加熱された熱操作流体を空調負荷に供給すると共に、制御手段を備えて各部に設置された温度センサと信号線を介して前記温度センサで検出される温度データを通信プロトコルにより制御装置へ収集して冷房運転または暖房運転を行う吸収冷温水機において、前記温度センサから送信される前記温度データの変化速度が予め設定した速度範囲から外れているとき、その温度を計測した温度センサに異常があると判定する手段と、前記温度データが前記判定によって異常であると判定された場合、該当する温度センサのＡ／Ｄ変換器を初期状態に復帰させるための所用の制御信号を送信する手段と、前記所用の制御信号を送信しても前記温度センサから送信される前記温度データの変化速度が予め設定した速度範囲から外れている場合、当該温度センサに異常があると判定して管理者に異常を知らせる手段を前記制御装置に備えた第２の構成の吸収冷温水機と、
【０００６】
配管により連結した高温再生器、低温再生器、凝縮器、蒸発器、吸収器などに吸収液と冷媒とを循環させ、前記蒸発器の内部に設置した伝熱管内を通って冷却される熱操作流体を空調負荷に供給する冷房運転と、前記伝熱管内を通って加熱される熱操作流体を空調負荷に供給する暖房運転を行う吸収冷温水機において、前記伝熱管に流れ込む熱操作流体の温度を計測する温度センサ４２と、前記伝熱管から流れ出る熱操作流体の温度を計測する温度センサ４３と、冷却水が前記吸収器から前記凝縮器へ流れるように配置した冷却水配管２３の前記吸収器入口部の冷却水温度を計測する温度センサ４４と、前記凝縮器出口部の前記冷却水温度を計測する温度センサ４５と、前記凝縮器から流れ出た冷媒の温度を計測する温度センサ４６と、前記蒸発器４から流れ出た冷媒の温度を計測する温度センサ４７と、前記高温再生器のガスバーナの排気ガス温度を計測する温度センサ４８と、前記高温再生器内の吸収液の温度を計測する温度センサ４９と、前記低温再生器から流れ出た吸収液の温度を計測する温度センサ５０と、前記各温度センサから入手した温度情報に基づいて吸収液および冷媒を循環させる循環手段などの各動作機能部分に制御信号を出力する制御装置４０とを備え、この制御装置４０には、冷房運転時には前記温度センサ４２の計測温度が前記温度センサ４３の計測温度よりも高く、暖房運転時には前記温度センサ４２の計測温度が前記温度センサ４３の計測温度よりも低く、冷房運転時には、温度センサ４４の計測温度が前記温度センサ４５の計測温度より低く、前記温度センサ４６の計測温度が前記温度センサ４７の計測温度より低く、前記温度センサ４９の計測温度が前記温度センサ５０の計測温度より低くなる温度関係が崩れたとき、当該温度センサに異常が生じていると判定するための判定プログラムを備えると共に、前記温度データが前記判定によって異常であると判定された場合、該当する温度センサのＡ／Ｄ変換器を初期状態に復帰させるための所用の制御信号を送信する手段を備えた第３の構成の吸収冷温水機と、
【０００７】
配管により連結した高温再生器、低温再生器、凝縮器、蒸発器、吸収器などに吸収液と冷媒とを循環させ、前記蒸発器の内部に設置した伝熱管内を通って冷却される熱操作流体を空調負荷に供給する冷房運転と、前記伝熱管内を通って加熱される熱操作流体を空調負荷に供給する暖房運転を行う吸収冷温水機において、前記伝熱管に流れ込む熱操作流体の温度を計測する温度センサ４２と、前記伝熱管から流れ出る熱操作流体の温度を計測する温度センサ４３と、冷却水が前記吸収器から前記凝縮器へ流れるように配置した冷却水配管２３の前記吸収器入口部の冷却水温度を計測する温度センサ４４と、前記凝縮器出口部の前記冷却水温度を計測する温度センサ４５と、前記凝縮器から流れ出た冷媒の温度を計測する温度センサ４６と、前記蒸発器４から流れ出た冷媒の温度を計測する温度センサ４７と、前記高温再生器のガスバーナの排気ガス温度を計測する温度センサ４８と、前記高温再生器内の吸収液の温度を計測する温度センサ４９と、前記低温再生器から流れ出た吸収液の温度を計測する温度センサ５０と、前記各温度センサから入手した温度情報に基づいて吸収液および冷媒を循環させる循環手段などの各動作機能部分に制御信号を出力する制御装置４０とを備え、この制御装置４０は、冷房運転中は前記各温度センサ４２〜５０の計測による温度データが予め設定した温度の範囲から外れたときその温度センサに異常があると判定し、暖房運転中は前記判定のうち前記温度センサ４４〜４７、５０についての前記判定を行わず、且つ、前記温度センサ４４〜４７及び４９〜５０から入手した温度の変化速度が予め設定した速度範囲から外れているとき、その温度を計測した温度センサに異常があると判定する機能を備えると共に、前記温度データが前記判定によって異常であると判定された場合その温度を計測した温度センサのＡ／Ｄ変換器を初期状態に復帰させるための所用の制御信号を送信する手段を備えた第４の構成の吸収冷温水機と、
【０００８】
前記第１の構成乃至第４の構成の吸収冷温水機のいずれかにおいて、前記初期状態に復帰させるための所用の制御信号は、前記異常であると判定された温度データが連続して所定回数送信されてきたとき、出力されることを特徴とする第５の構成の吸収冷温水機と、を提供するものである。
【００１０】
【発明の実施の形態】
以下、本発明の一実施形態を図面に基づいて詳細に説明する。
図１は、図示しない室内ユニットに冷水または温水を熱操作流体として循環供給して冷暖房などを行うことのできる、二重効用吸収式冷凍機からなる本発明の吸収冷温水機の構成図であり、冷媒に水を、吸収液に臭化リチウム（ＬｉＢｒ）水溶液を使用している。
【００１１】
図において、１はガスバーナ１Ｂを備えた高温再生器、２は低温再生器、３は凝縮器、４は蒸発器、５は吸収器、６は低温熱交換器、７は高温熱交換器、８〜１１は吸収液管、１３は吸収液ポンプ、１４〜１８は冷媒配管、１９は冷媒ポンプ、２２は図示しない室内ユニットに循環供給する冷熱または温熱を循環供給する冷水または温水が流れ、途中に伝熱管４Ａを備えた冷温水配管、２３は途中に伝熱管５Ａおよび伝熱管３Ａを備えた冷却水配管、２４はガスバーナＢに接続されたガス供給管、２５はガス供給管２４の途中に設けられてガスバーナＢに供給するガス量を制御し、発熱量すなわち高温再生器１に投入する熱量を制御する入熱制御弁、２６はこの入熱制御弁の開度を調節するための制御弁モータ、２７〜２９は開閉弁であり、これらの機器はそれぞれ図１に示したように配管接続されており、この構成自体は従来周知である。
【００１２】
そして、上記構成の二重効用吸収冷温水機において、開閉弁２７・２８・２９を閉じ、冷却水配管２３に冷却水を流し、ガスバーナ１Ｂに点火して高温再生器１で吸収液を加熱すると、吸収液から蒸発分離した冷媒蒸気と、冷媒蒸気を分離して吸収液の濃度が高くなった中間吸収液とが得られる。
【００１３】
高温再生器１で生成された高温の冷媒蒸気は、冷媒配管１４を通って低温再生器２に入り、高温再生器１で生成され吸収液管９により高温熱交換器７を経由して低温再生器２に入った中間吸収液を加熱して放熱凝縮し、凝縮器３に入る。
【００１４】
また、低温再生器２で加熱されて中間吸収液から蒸発分離した冷媒は凝縮器３へ入り、冷却水配管２３を介して供給され、伝熱管３Ａの内部を流れる水と熱交換して凝縮液化し、冷媒配管１４から凝縮して供給される冷媒と一緒になって冷媒配管１５を通って蒸発器４に入る。
【００１５】
蒸発器４に入って冷媒液溜りに溜まった冷媒液は、冷温水配管２２に接続された伝熱管４Ａの上に冷媒ポンプ１９によって散布され、冷温水配管２２を介して供給される水と熱交換して蒸発し、伝熱管４Ａの内部を流れる水を冷却する。
【００１６】
そして、蒸発器４で蒸発した冷媒は吸収器５に入り、低温再生器２で加熱されて冷媒を蒸発分離し、吸収液の濃度が一層高まった吸収液、すなわち吸収液管１０により低温熱交換器６を経由して供給され、上方から散布される濃吸収液に吸収される。
【００１７】
吸収器５で冷媒を吸収して濃度の薄くなった吸収液、すなわち稀吸収液は吸収液ポンプ１３の運転により、低温熱交換器６・高温熱交換器７を経由して高温再生器１へ吸収液管８から送られる。
【００１８】
上記のように吸収冷温水機の運転が行われると、蒸発器４の内部に配管された伝熱管４Ａにおいて冷媒の気化熱によって冷却された冷水が、冷温水配管２２を介して図示しない室内ユニットに循環供給できるので、冷房運転などが行える。
【００１９】
一方、開閉弁２７・２８・２９を開け、冷却水配管２３に冷却水を流さないでガスバーナ１Ｂに点火して高温再生器１で稀吸収液を加熱すると、高温再生器１で稀吸収液から蒸発した冷媒は冷媒配管１４の途中から主に流路抵抗の小さい冷媒配管１７を通って吸収器５・蒸発器４に入り、冷温水配管２２から供給される水と伝熱管４Ａを介して熱交換して凝縮し、主にこのときの凝縮熱によって伝熱管４Ａの内部を流れる水が加熱される。
【００２０】
蒸発器４で加熱作用を行って凝縮した冷媒は、冷媒配管１８を通って吸収器５に入り、高温再生器１で冷媒を蒸発分離して吸収液管１１から流入する吸収液と混合され、吸収液ポンプ１３の運転によって低温熱交換器６・高温熱交換器７を経て高温再生器１へ送られる。
【００２１】
そして、蒸発器４内部の伝熱管４Ａで加熱された温水を冷温水配管２２を介して図示しない室内ユニットに循環供給することにより、暖房運転などが行なわれる。
【００２２】
４０は、上記のような動作機能を有する二重効用吸収冷温水機に設けた制御装置であり、例えば図２に示したようにＭＰＵ（マイクロプロセッサユニット）２３１、プログラムなどを記憶するＲＯＭ２３２Ａ、温度データなどを記憶するＲＡＭ２３２Ｂ、通信手段となる入出力のインターフェース２３３、２３４、２３７、２３８などを備えて、ガスバーナ１Ｂの入熱制御弁２５を駆動する制御弁モータ２６、表示器４１などに所用の制御信号を出力するものである。
【００２３】
そして、制御装置４０のＩ／Ｏインターフェース２３４には、冷温水配管２２の蒸発器４入口部に設けられて蒸発器４に流れ込んでいる冷温水の温度を計測する温度センサ４２と、冷温水配管２２の蒸発器４出口部に設けられて蒸発器４から冷温水配管２２に流れ出た冷温水の温度を計測する温度センサ４３と、冷却水配管２３の吸収器５入口部に設けられて吸収器５に流れ込んでいる冷却水の温度を計測する温度センサ４４と、冷却水配管２３の凝縮器３出口部に設けられて凝縮器３から冷却水配管２３に流れ出た冷却水の温度を計測する温度センサ４５と、冷媒配管１５の凝縮器３出口部に設けられて凝縮器３から冷媒配管１５に流れ出た冷媒の温度を計測する温度センサ４６と、冷媒配管１６の蒸発器４出口部に設けられて蒸発器４から冷媒配管１６に流れ出た冷媒の温度を計測する温度センサ４７と、ガスバーナ１Ｂの排気管に設けられて排ガスの温度を計測する温度センサ４８と、高温再生器１に設けられて高温再生器１内の吸収液の温度を計測する温度センサ４９と、吸収液配管１０の低温再生器２出口部に設けられて低温再生器２から吸収液配管１０に流れ出た吸収液の温度を計測する温度センサ５０とが接続される。
【００２４】
この場合、温度センサ４２〜５０は、１本の渡り配線からなる信号線３９（図１に１点鎖線で示す）にカプラを介して接続されており、この信号線３９が制御装置４０のＩ／Ｏインターフェース２３４に接続された構成になっている。
【００２５】
すなわち、制御装置４０のＭＰＵ２３１は、Ｉ／Ｏインターフェース２３４と信号線３９を介して温度センサ４２〜５０とデータ授受などの通信を行う。そして、ＲＯＭ２３２ＡとＲＡＭ２３２Ｂには、入熱制御弁２５の制御弁モータ２６などを制御するためのプログラムと共に、温度センサ４２〜５０とデータ通信などを行うための通信プロトコルや温度センサ４２〜５０を識別するためのソフトウエアが設定されている。
【００２６】
温度センサ４２〜５０は何れも同じ構成であり、温度センサ４２を例に挙げてその構成を説明する。図３に示したように、温度センサ４２はセンサ側制御手段であるＭＰＵ２４３と、記憶手段であるメモリ２４４と、通信手段であるＩ／Ｏインターフェース２４６と、Ａ／Ｄ変換器２４７と、このＡ／Ｄ変換器２４７に接続された温度検出素子としてのセンサ部２４８と、蓄電素子であるコンデンサ２４９と、整流素子であるダイオード２５１などから構成されている。
【００２７】
この場合、コンデンサ２４９はダイオード２５１の出力側に接続され、このダイオード２５１とコンデンサ２４９との接続点に各素子が接続されている。また、温度センサ４２のダイオード２５１の入力側と接地間には、信号波形整形用のダイオード２５５が追加接続されている。信号線３９には例えば＋５Ｖの電位（高電位）が印加されており、データはこの高電位から例えば０Ｖの低電位に下がるパルスにより構成される。
【００２８】
そして、温度センサ４２が信号線３９に接続されると、データを構成する高電位と低電位のパルス信号が高電位となっている間はそのまま各素子に給電がなされ、コンデンサ２４９にも充電される。そして、低電位になっている間はコンデンサ２４９から放電され、各素子の電源が賄われる。
【００２９】
なお、温度センサ４２にはＶｃｃ（ＤＣ＋５Ｖ）電源端子２４５も設けられ、ダイオード２５１とコンデンサ２４９との接続点に接続されており、温度センサ４２はこのＶｃｃ電源端子２４５を電源線に接続すれば、各素子は電源線からの給電によっても動作することができるように構成されている。すなわち、その場合にはコンデンサ２４９に充電することなく、各素子は動作するようになるので、検査時などの温度センサ４２を迅速に動作させたい場合に利便性が向上する。
【００３０】
また、ＭＰＵ２４３はセンサ部２４８が計測する温度データをＡ／Ｄ変換器２４７を介して取り込み、一旦メモリ２４４に書き込む。そして、Ｉ／Ｏインターフェース２４６により、信号線３９を介して制御装置４０からポーリングされると、メモリ２４４に書き込まれている温度データをＩ／Ｏインターフェース２４６により信号線３９を介して制御装置４０に送信する。
【００３１】
ここで、メモリ２４４には温度センサ４２自体のＩＤコードやセンサである旨の識別データ、警報温度などの設定値データおよび制御装置４０との間の通信を行うためのプロトコルなどが記憶されている。
【００３２】
また、信号線３９の総延長が長くなると信号に歪が生じてくるが、温度センサ４２には波形整形用のダイオード２５５が接続されているので、係る信号波形の歪を矯正し上記のようなデータの送受信が確実に行われるようにしてある。
【００３３】
温度センサ４２〜５０が信号線３９に接続され、電源が投入されると、制御装置４０のＭＰＵ２３１は先ず信号線３９への各温度センサの接続状況をスキャンする。温度センサ４２〜５０の各ＭＰＵ２４３は制御装置４０からのポーリングに対してそのメモリ２４４に記憶されている自らのＩＤコードを返信する。制御装置４０のＭＰＵ２３１は返信されたＩＤコードにより、温度センサ４２〜５０の接続状況を識別し、ＲＡＭ２３２Ｂに保有すると共に、以降はこのＩＤコードを用いて温度センサ４２〜５０と温度データの通信などを行うことになる。
【００３４】
そして、制御装置４０のＭＰＵ２３１は、温度センサ４２〜５０に所定の周期でポーリングを行う。このポーリングは前述のＩＤコードに基づいて行われる。温度センサ４２〜５０の各ＭＰＵ２４３は、このポーリングに応えて前述のように温度データを制御装置４０に送信する。制御装置４０のＭＰＵ２３１は、受け取った温度データを一旦ＲＡＭ２３２Ｂに書き込み、その温度データに基づいて後述するように各機器の制御を実行する。
【００３５】
しかし、この温度データの送信時に、例えば電気的ノイズなどによりＡ／Ｄ変換器２４７が一時的あるいは連続的にロックし、正常な温度データが制御装置４０に送信できなくなることがあるので、温度センサ４２〜５０から送信されてきた温度データの真偽が制御装置４０において判定できるようにしてある。
【００３６】
すなわち、この吸収冷温水機においては、冷温水配管２２、冷却水配管２３、冷媒配管１５、１６の内部には水が流れているので、それぞれに設置された温度センサ４２〜４７が計測する温度は何れも０℃より低くなることはない。また、外気温度が高いときに行う冷房運転時においても、室内ユニットが設置される部屋（加熱器具が設置されていない一般的な部屋の場合）や外気の温度が６０℃を超えることは通常は考えられないので、温度センサ４２〜４７が計測する温度が冷房運転中に６０℃を超えることは考えられない。
【００３７】
このため、冷房運転中に温度センサ４２〜４７が計測し、制御装置４０のＲＡＭ２３２Ｂに書き込まれた温度データが０〜６０℃の範囲に該当するものであるか否かを先ず判定し、範囲外の温度データであるときにはその温度データを計測した温度センサに異常が生じていると判定するための判定プログラムを、制御装置４０のＲＯＭ２３２Ａに記憶してある。
【００３８】
一方、外気温度が低いときに行う暖房運転時に冷温水配管２２を流れ、蒸発器４内の伝熱管４Ａにおいて主に冷媒蒸気と熱交換して加熱される温水の温度が１００℃を超えることは経験的にないので、暖房運転中に温度センサ４２、４３が計測し、制御装置４０のＲＡＭ２３２Ｂに書き込まれた温度データは、先ず０〜１００℃の範囲に該当するものであるか否かが判定され、範囲外の温度データであるときにはその温度データを計測した温度センサに異常が生じていると判定するための判定プログラムを、制御装置４０のＲＯＭ２３２Ａに記憶してある。
【００３９】
また、定常運転中に温度センサ４８が計測するガスバーナ１Ｂから出る排ガスの温度と入熱制御弁２５の開度とは相関がある。例えば、予め求めておいた図４に示す入熱制御弁２５の開度と排ガス温度との関係図に示された温度範囲に対し、温度センサ４８が実際に計測し、制御装置４０のＲＡＭ２３２Ｂに書き込まれた温度データが上下何れにも例えば２５％以上もずれたときには、温度センサ４８に異常が発生していると考えるべきであり、この判定を行うための判定プログラムも制御装置４０のＲＯＭ２３２Ａに記憶してある。
【００４０】
排ガス温度と同様に、定常運転中に温度センサ４９が計測する高温再生器１内の吸収液の温度と入熱制御弁２５の開度との間にも相関がある。したがって、例えば予め求めておいた図５に示す入熱制御弁２５の開度と吸収液温度との関係図に示された温度範囲に対し、温度センサ４９が実際に計測し、制御装置４０のＲＡＭ２３２Ｂに書き込まれた温度データが上下何れにも例えば２５％以上もずれたときには、温度センサ４９に異常が発生していると考えるべきであり、この判定を行うための判定プログラムも制御装置４０のＲＯＭ２３２Ａに記憶してある。
【００４１】
また、冷房運転時に低温再生器２から吸収液配管１０に流れ出た吸収液の温度は経験的に０〜９５℃の範囲を外れることはないので、その部分の温度を計測している温度センサ５０が実際に計測し、制御装置４０のＲＡＭ２３２Ｂに書き込まれた温度データが０〜９５℃の範囲を外れたときには、温度センサ５０に異常が発生していると考えるべきであり、この判定を行うための判定プログラムも制御装置４０のＲＯＭ２３２Ａに記憶してある。
【００４２】
なお、暖房運転時には冷却水配管２３、冷媒配管１５、１６および吸収液配管１０の内部を流体が流れることはないので、これらの配管に設置された温度センサ４４〜４７と５０は、暖房運転中は動作させる必要がない。このため、温度センサ４４〜４７と５０については、暖房運転中は前記判定は行わない。
【００４３】
また、温度センサ４８以外の温度センサは、比熱の大きい冷媒（水）または吸収液の温度を計測しているので、通常は１０℃／秒を超える急激な変動は起こりえない。このため、温度センサ４８以外の温度センサにおいては、温度センサが実際に計測し、制御装置４０のＲＡＭ２３２Ｂに書き込まれた温度データが１０℃／秒を超えて変動したときには、その温度データを計測した温度センサに異常が発生していると考えるべきであり、この判定を行うための判定プログラムも制御装置４０のＲＯＭ２３２Ａに記憶してある。
【００４４】
一方、温度センサ４２〜５０が計測する流体の温度は、定常運転中であっても経験的に０．１℃を超える変動が確認されている。このため、温度センサが実際に計測し、制御装置４０のＲＡＭ２３２Ｂに書き込まれた温度データに所定時間を超えて０．１℃の変動が確認されなかったときには、その温度データを計測した温度センサに異常が発生していると考えるべきであり、この判定を行うための判定プログラムも制御装置４０のＲＯＭ２３２Ａに記憶してある。
【００４５】
そして、温度センサ４２〜５０が計測し、制御装置４０のＲＡＭ２３２Ｂに書き込まれた温度データが正常な温度データでないと判定されたときには、ＲＡＭ２３２Ｂに書き込まれた温度データを破棄すると共に、直ちに温度を計測し直して制御装置４０に送信する要求を当該温度センサに出力するためのプログラムも制御装置４０のＲＯＭ２３２Ａに記憶してある。
【００４６】
そして、再送信され、制御装置４０のＲＡＭ２３２Ｂに再書き込みされた温度データに対しても上記と同様にして正常なものであるか否かを判定し、正常なものであると判定されたときには制御装置４０のＲＡＭ２３２Ｂに再書き込みされた温度データに基づいて各機器の制御を実行し、正常なものでないと判定されたときにはさらなる計測と温度データの送信を要求し、受信し制御装置４０のＲＡＭ２３２Ｂに書き込まれた温度データが正常なものであると判定されたときにはその正常であると判定された温度データに基づいて各機器の制御を実行し、正常なものでないと判定されたときには、Ｉ／Ｏインターフェース２３３を介して表示器４１に所用の制御信号を送信し、異常が発生した温度センサの番号などを表示して装置管理者に異常の発生を知らせるようになっている。
【００４７】
そして、例えば冷房運転時に温度センサ４２が計測し、制御装置４０のＲＡＭ２３２Ｂに書き込まれた冷水の温度データが正常であると判定されたときには、制御装置４０のＭＰＵ２３１は従来周知の制御装置における場合と同様に、前記書き込まれた冷水の温度データと設定温度（例えば＋７℃）とを比較し、前記冷水の温度データが設定温度よりも高ければ高いほど入熱制御弁２５の開度を大きくするように制御弁モータ２６を動作させ、前記冷水の温度データが前記設定温度よりも低ければ低いほど、入熱制御弁２５の開度を小さくするように制御弁モータ２６を動作させるように構成されている。
【００４８】
また、暖房運転時に温度センサ４２が計測し、制御装置４０のＲＡＭ２３２Ｂに書き込まれた温水の温度データが正常であると判定されたときには、制御装置４０のＭＰＵ２３１はこの場合も従来周知の制御装置における場合と同様に、前記書き込まれた温水の温度データと設定温度（例えば＋４５℃）とを比較し、前記温水の温度データが設定温度よりも低ければ低いほど入熱制御弁２５の開度を大きくするように制御弁モータ２６を動作させ、前記温水の温度データが高ければ高いほど、入熱制御弁２５の開度を小さくするように制御弁モータ２６を動作させるように構成されている。
【００４９】
さらに、制御装置４０のＭＰＵ２３１は、冷温水配管２２の蒸発器４出入口部に設置された温度センサ４２、４３が計測し、制御装置４０のＲＡＭ２３２Ｂに書き込まれた冷温水の温度データの差に基づいて負荷制御を実行する。また、制御装置４０のＭＰＵ２３１は、冷媒配管１６の蒸発器４出口部に設置された温度センサ４７が計測し、制御装置４０のＲＡＭ２３２Ｂに書き込まれた冷媒の温度データに基づいて冷媒の凍結保護動作を実行する。なお、これらの制御も、温度センサ４２、４３、４７が計測し、制御装置４０のＲＡＭ２３２Ｂに書き込まれた温度データが正常であるのを確認して実行される。
【００５０】
また、制御装置４０のＭＰＵ２３１は、温度センサ４４、４５が計測し、制御装置４０のＲＡＭ２３２Ｂに書き込まれた冷却水の温度データの差に基づいて、あるいは温度センサ４９が計測し、制御装置４０のＲＡＭ２３２Ｂに書き込まれた高温再生器１の温度データ（例えば+１６０℃を超える温度データが計測されたときは異常）に基づいて、さらには温度センサ４８が計測し、制御装置４０のＲＡＭ２３２Ｂに書き込まれたガスバーナ１Ｂの排ガスの温度データ（例えば２５０℃を超える温度データが計測されたときは異常）に基づいて、それぞれに対応した所定の保護動作（例えば運転の停止など）を実行すると共に、温度センサ４６、４９が計測し、制御装置４０のＲＡＭ２３２Ｂに書き込まれた温度データに基づいて低温再生器２から吸収器５に供給されている吸収液配管１０の濃吸収液の濃度を算出し、その濃度が基準濃度、例えば６４％を維持する制御を行うように構成されている。これらの制御も、各温度センサが計測し、制御装置４０のＲＡＭ２３２Ｂに書き込まれた温度データが正常であるのを確認して実行される。
【００５１】
なお、制御装置４０は、温度センサ４２〜５０が計測して送信し、ＲＡＭ２３２Ｂに書き込まれた温度データが異常な温度データであると上記判定プログラムにより判定されたときには、その温度データを計測して送信してきた温度センサに対し、その温度センサのＡ／Ｄ変換器２４７を初期状態に復帰させるための所用の制御信号を出力するように構成することもできる。
【００５２】
制御装置４０をこのように構成したときには、異常な温度データを送信してきた温度センサ４２〜５０のＡ／Ｄ変換器２４７が、例えばノイズにより一時的にロックしていたようなときには、Ａ／Ｄ変換器２４７は直ぐに正常な状態に復帰し、次の計測では温度が正しく計測されるので、制御装置４０には正常な温度データが送信されるようになる。
【００５３】
そして、この場合は、Ａ／Ｄ変換器２４７が初期状態に復帰した温度センサにより再計測され、再送信されてＲＡＭ２３２Ｂに再書き込みされた温度データも正常な温度データでないと上記判定プログラムにより判定されたときには、再度Ａ／Ｄ変換器２４７を初期状態に復帰させるための所用の制御信号を出力するように制御装置４０が構成されると共に、その後も正常でない温度データを計測して送信してきたときには、Ｉ／Ｏインターフェース２３３を介して表示器４１に所用の制御信号を送信し、異常が発生した温度センサの番号などを表示して装置管理者に異常の発生を知らせるようになっている。
【００５４】
なお、温度センサ４２〜５０のＡ／Ｄ変換器２４７を初期状態に復帰させるための制御信号は、連続して所定回数、例えば２回連続して異常な温度データが送信されてきたときに出力するように構成しても良い。
【００５５】
ところで、本発明は上記実施形態に限定されるものではないので、特許請求の範囲に記載の趣旨から逸脱しない範囲で各種の変形実施が可能である。
【００５６】
例えば、冷房運転時には温度センサ４２が計測する冷水の温度の方が、温度センサ４３が計測する冷水の温度より高く、暖房運転時には温度センサ４２が計測する温水の温度の方が、温度センサ４３が計測する温水の温度より低くなる。また、冷房運転時に温度センサ４４が計測する冷却水の温度の方が、温度センサ４５が計測する冷却水の温度より低く、温度センサ４６が計測する冷媒の温度の方が、温度センサ４７が計測する冷媒の温度より低い。また、温度センサ４９が計測する吸収液の温度の方が、温度センサ５０が計測する吸収液の温度より低いのでので、この温度関係が崩れたときには何れかの温度センサに異常が生じていることになり、それを判定するための判定プログラムを制御装置４０のＲＯＭ２３２Ａに記憶するようにしても良い。
【００５７】
また、吸収冷温水機が定常運転に到達する前の温度を計測している温度センサ４２〜５０についても、上記定常運転の場合と同様にして温度センサ４２〜５０の正常／異常を判定することができる。
【００５８】
また、温度センサ４２〜５０に異常が発生したことが確認されたときには、表示器４１に表示するだけでなく、ブザーの吹鳴、ライトの点滅などを併用して、一層確実に管理者に知らせることができるようにしても良い。
【００５９】
また、温度センサ４２〜５０には半導体が使用されており、現状では１５０℃を超える環境に設置すると誤作動する懸念があるので、ガスバーナ１Ｂの排ガス温度を計測する温度センサ４８と、高温再生器１にある吸収液の温度を計測する温度センサ４９については、温度を計測する位置に耐熱性のセンサ部２４８だけを設置するように構成する。
【００６０】
【発明の効果】
以上説明したように、本発明によれば、温度センサが計測して送信してきた温度が予め設定した温度の範囲から外れているとき、あるいはその温度の変化速度が予め設定した速度範囲から外れているときには、温度データの伝達経路に異常があるとして入手した温度データを制御装置が破棄し、再度の計測・送信などを求めるので、ノイズなどが入って正常な通信が行えないことがあっても、入手した異常な温度データに基づいて制御が行われることがない。
【００６１】
また、本発明によれば、異常対策を繰り返し実施しても正常な温度データを計測して送信することができない温度センサがあれば、警報を発して装置管理者などに温度センサの異常を知らせることができる。
【００６２】
また、本発明によれば、温度センサが計測して送信してきた温度が予め設定した温度の範囲から外れているとき、あるいはその温度の変化速度が予め設定した速度範囲から外れているときには、その温度を検出した温度センサの制御手段に初期状態復帰指示信号を出力することができるので、ノイズが入って正常な通信が行えない温度センサがあっても、その異常な温度データに基づいて制御が行われることはなく、温度センサの回復が図れる。
【図面の簡単な説明】
【図１】吸収冷温水機の構成を示す説明図である。
【図２】温度計測系の構成を示す説明図である。
【図３】温度センサの構成を示す説明図である。
【図４】燃料制御弁の弁開度と排ガス温度との関係を示す説明図である。
【図５】燃料制御弁の弁開度と（濃）吸収液温度との関係を示す説明図である。
【符号の説明】
１高温再生器
１Ｂガスバーナ
２低温再生器
３凝縮器
３Ａ伝熱管
４蒸発器
４Ａ伝熱管
５吸収器
５Ａ伝熱管
６低温熱交換器
７高温熱交換器
８〜１１吸収液管
１３吸収液ポンプ
１４〜１８冷媒配管
１９冷媒ポンプ
２２冷温水管
２３冷却水配管
２４ガス供給管
２５入熱制御弁
２６制御弁モータ
２７〜２９開閉弁
３９信号線
４０制御装置
４１表示器
４２〜５０温度センサ
２３１ＭＰＵ
２３２ＡＲＯＭ
２３２ＢＲＡＭ
２３３、２３４、２３７、２３８インターフェース
２４３ＭＰＵ
２４４メモリ
２４６インターフェース
２４７Ａ／Ｄ変換器
２４８センサ部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an absorption chiller / heater.
[0002]
[Prior art]
The temperature detection element, the storage means having its own ID code, and the temperature information measured by the temperature detection element are captured and written in the storage means, and the temperature information written in the storage means is transmitted to the outside via the communication means. Each operating function part such as a circulating means for circulating an absorbing liquid or a refrigerant based on the temperature measured by the temperature sensor while installing a temperature sensor comprising a sensor-side control means in a desired part of the absorption chiller / heater The present applicant has already proposed in Japanese Patent Application No. 11-136002 a control device for an absorption chiller / heater that can output a control signal to the plug-in, thereby enabling wiring of the temperature sensor, thereby simplifying the wiring. In addition, we have already achieved a significant cost reduction through the common use of software.
[0003]
[Problems to be solved by the invention]
However, in the absorption chiller / heater control device proposed in Japanese Patent Application No. 11-136002, there are cases in which normal communication cannot be performed due to noise during communication between the control device connected by the signal line and the temperature sensor. Therefore, it is necessary to automatically take appropriate measures when a communication abnormality occurs, and the solution has been an issue.
[0004]
[Means for Solving the Problems]
In order to solve the above-mentioned problems of the prior art, the present invention circulates an absorption liquid and a refrigerant in a high-temperature regenerator, a low-temperature regenerator, a condenser, an evaporator, an absorber, and the like connected by piping, and is installed inside the evaporator. Temperature data detected by the temperature sensor via a temperature sensor and a signal line provided in each part with a control means while supplying a heat-treated fluid cooled or heated through the heat transfer pipe to the air conditioning load Means for determining whether the temperature data transmitted from the temperature sensor is out of a preset temperature range in an absorption chiller / heater that performs cooling operation or heating operation by collecting the data in a control device using a communication protocol; When the temperature data is determined to be abnormal by the determination, Applicable temperature sensor A / D converter When the temperature data transmitted from the temperature sensor is out of the preset temperature range even if the desired control signal for returning to the initial state is transmitted and the desired control signal is transmitted, An absorption chiller / heater having a first configuration provided with a means for determining that the temperature sensor is abnormal and notifying the administrator of the abnormality;
[0005]
Heat that is cooled or heated through the heat transfer tubes installed inside the evaporator by circulating the absorbent and refrigerant through high-temperature regenerators, low-temperature regenerators, condensers, evaporators, and absorbers connected by piping The operation fluid is supplied to the air conditioning load, and temperature data detected by the temperature sensor via a temperature sensor and a signal line provided in each part with a control unit is collected to the control device by a communication protocol to perform cooling operation or In an absorption chiller / heater that performs heating operation, when a change speed of the temperature data transmitted from the temperature sensor is out of a preset speed range, a means for determining that the temperature sensor that measures the temperature is abnormal And when the temperature data is determined to be abnormal by the determination, Applicable temperature sensor A / D converter Means for transmitting a desired control signal for returning to the initial state, and even if the desired control signal is transmitted, the change rate of the temperature data transmitted from the temperature sensor is out of the preset speed range. In the case, the absorption chiller / heater of the second configuration provided in the control device with means for determining that the temperature sensor is abnormal and notifying the administrator of the abnormality,
[0006]
Thermal operation in which the absorption liquid and the refrigerant are circulated through a high-temperature regenerator, a low-temperature regenerator, a condenser, an evaporator, an absorber, etc. connected by piping, and cooled through a heat transfer tube installed inside the evaporator. In an absorption chiller / heater that performs a cooling operation for supplying fluid to an air conditioning load and a heating operation for supplying a thermal operation fluid heated through the heat transfer tube to the air conditioning load, the temperature of the heat operation fluid flowing into the heat transfer tube The temperature sensor 42 for measuring the temperature, the temperature sensor 43 for measuring the temperature of the thermal operation fluid flowing out from the heat transfer tube, and the absorber of the cooling water pipe 23 arranged so that the cooling water flows from the absorber to the condenser A temperature sensor 44 for measuring the coolant temperature at the inlet, a temperature sensor 45 for measuring the coolant temperature at the outlet of the condenser, a temperature sensor 46 for measuring the temperature of the refrigerant flowing out of the condenser, A temperature sensor 47 for measuring the temperature of the refrigerant flowing out of the generator 4, a temperature sensor 48 for measuring the exhaust gas temperature of the gas burner of the high temperature regenerator, and a temperature sensor for measuring the temperature of the absorbing liquid in the high temperature regenerator 49, a temperature sensor 50 for measuring the temperature of the absorbing liquid flowing out from the low-temperature regenerator, and an operating function part such as a circulating means for circulating the absorbing liquid and the refrigerant based on the temperature information obtained from each temperature sensor. And a control device 40 that outputs a control signal. In the control device 40, the temperature measured by the temperature sensor 42 is higher than the temperature measured by the temperature sensor 43 during the cooling operation, and the temperature sensor 42 measures the temperature during the heating operation. The temperature is lower than the measured temperature of the temperature sensor 43, and during the cooling operation, the measured temperature of the temperature sensor 44 is lower than the measured temperature of the temperature sensor 45. When the temperature relationship where the measured temperature of the temperature sensor 46 is lower than the measured temperature of the temperature sensor 47 and the measured temperature of the temperature sensor 49 is lower than the measured temperature of the temperature sensor 50 is broken, an abnormality occurs in the temperature sensor. And a determination program for determining that the temperature data is abnormal by the determination, Applicable temperature sensor A / D converter An absorption chiller / heater having a third configuration including means for transmitting a control signal for returning to an initial state;
[0007]
Thermal operation in which the absorption liquid and the refrigerant are circulated through a high-temperature regenerator, a low-temperature regenerator, a condenser, an evaporator, an absorber, etc. connected by piping, and cooled through a heat transfer tube installed inside the evaporator. In an absorption chiller / heater that performs a cooling operation for supplying fluid to an air conditioning load and a heating operation for supplying a thermal operation fluid heated through the heat transfer tube to the air conditioning load, the temperature of the heat operation fluid flowing into the heat transfer tube The temperature sensor 42 for measuring the temperature, the temperature sensor 43 for measuring the temperature of the thermal operation fluid flowing out from the heat transfer tube, and the absorber of the cooling water pipe 23 arranged so that the cooling water flows from the absorber to the condenser A temperature sensor 44 for measuring the coolant temperature at the inlet, a temperature sensor 45 for measuring the coolant temperature at the outlet of the condenser, a temperature sensor 46 for measuring the temperature of the refrigerant flowing out of the condenser, A temperature sensor 47 for measuring the temperature of the refrigerant flowing out of the generator 4, a temperature sensor 48 for measuring the exhaust gas temperature of the gas burner of the high temperature regenerator, and a temperature sensor for measuring the temperature of the absorbing liquid in the high temperature regenerator 49, a temperature sensor 50 for measuring the temperature of the absorbing liquid flowing out from the low-temperature regenerator, and an operating function part such as a circulating means for circulating the absorbing liquid and the refrigerant based on the temperature information obtained from each temperature sensor. And a control device 40 that outputs a control signal. During the cooling operation, the control device 40 abnormalizes the temperature sensor when the temperature data measured by the temperature sensors 42 to 50 deviates from the preset temperature range. It is determined that there is During heating operation Among the determinations, when the determinations for the temperature sensors 44 to 47 and 50 are not performed, and the temperature change speed obtained from the temperature sensors 44 to 47 and 49 to 50 is out of a preset speed range. When the temperature sensor that measures the temperature has a function to determine that there is an abnormality, and the temperature data is determined to be abnormal by the determination The A / D converter of the temperature sensor that measured the temperature An absorption chiller / heater having a fourth configuration including means for transmitting a control signal for returning to the initial state;
[0008]
In any one of the absorption chiller / heater units of the first configuration to the fourth configuration, the desired control signal for returning to the initial state is a predetermined number of times the temperature data determined to be abnormal An absorption chiller / heater having a fifth configuration, characterized in that it is output when transmitted, Is to provide.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a configuration diagram of an absorption chiller / heater according to the present invention comprising a dual-effect absorption chiller that can circulate and supply chilled water or hot water as a thermal operation fluid to an indoor unit (not shown) to perform cooling and heating. Water is used as the refrigerant, and an aqueous lithium bromide (LiBr) solution is used as the absorbing solution.
[0011]
In the figure, 1 is a high temperature regenerator equipped with a gas burner 1B, 2 is a low temperature regenerator, 3 is a condenser, 4 is an evaporator, 5 is an absorber, 6 is a low temperature heat exchanger, 7 is a high temperature heat exchanger, 8 11 to 11 are absorption liquid pipes, 13 are absorption liquid pumps, 14 to 18 are refrigerant pipes, 19 is a refrigerant pump, 22 is cold water or hot water that circulates and supplies cold heat or hot water to be circulated to indoor units (not shown), and flows in the middle. Cold / hot water pipe provided with the heat transfer pipe 4A, 23 is a cooling water pipe provided with the heat transfer pipe 5A and the heat transfer pipe 3A, 24 is a gas supply pipe connected to the gas burner B, and 25 is provided in the middle of the gas supply pipe 24 The heat input control valve 26 controls the amount of gas supplied to the gas burner B and controls the amount of heat generated, that is, the amount of heat input to the high temperature regenerator 1, and 26 is a control valve motor for adjusting the opening of the heat input control valve. , 27 to 29 are on-off valves, These devices are connected by piping as shown in FIG. 1, respectively, the structure itself is well known prior art.
[0012]
In the dual effect absorption chiller / heater configured as described above, when the on-off valves 27, 28, and 29 are closed, the coolant is supplied to the coolant pipe 23, the gas burner 1 B is ignited, and the high-temperature regenerator 1 heats the absorbent. Thus, the refrigerant vapor evaporated and separated from the absorption liquid and the intermediate absorption liquid in which the concentration of the absorption liquid is increased by separating the refrigerant vapor are obtained.
[0013]
The high-temperature refrigerant vapor generated in the high-temperature regenerator 1 enters the low-temperature regenerator 2 through the refrigerant pipe 14, and is generated in the high-temperature regenerator 1 through the high-temperature heat exchanger 7 through the high-temperature heat exchanger 7. The intermediate absorption liquid that has entered the condenser 2 is heated and condensed by heat dissipation, and enters the condenser 3.
[0014]
Further, the refrigerant heated by the low temperature regenerator 2 and evaporated and separated from the intermediate absorption liquid enters the condenser 3 and is supplied through the cooling water pipe 23 to exchange heat with water flowing inside the heat transfer pipe 3A to be condensed and liquefied. Then, together with the refrigerant condensed and supplied from the refrigerant pipe 14, the refrigerant 4 enters the evaporator 4 through the refrigerant pipe 15.
[0015]
The refrigerant liquid that has entered the evaporator 4 and accumulated in the refrigerant liquid reservoir is sprayed by the refrigerant pump 19 on the heat transfer pipe 4 </ b> A connected to the cold / hot water pipe 22, and water and heat supplied through the cold / hot water pipe 22. It exchanges and evaporates and cools the water which flows through the inside of the heat exchanger tube 4A.
[0016]
Then, the refrigerant evaporated in the evaporator 4 enters the absorber 5 and is heated in the low-temperature regenerator 2 to evaporate and separate the refrigerant, so that the absorption liquid having a further increased concentration of the absorption liquid, that is, the low-temperature heat exchange by the absorption liquid pipe 10. It is supplied via the vessel 6 and absorbed by the concentrated absorbent dispersed from above.
[0017]
Absorbing liquid whose concentration has been reduced by absorbing the refrigerant in the absorber 5, that is, the rare absorbing liquid, is transferred to the high temperature regenerator 1 via the low temperature heat exchanger 6 and the high temperature heat exchanger 7 by the operation of the absorption liquid pump 13. It is sent from the absorption liquid pipe 8.
[0018]
When the absorption chiller / heater is operated as described above, the chilled water cooled by the heat of vaporization of the refrigerant in the heat transfer pipe 4A piped inside the evaporator 4 is not shown through the chilled / hot water pipe 22. Since it can be circulated and supplied, it can be cooled.
[0019]
On the other hand, when the on-off valves 27, 28, and 29 are opened to ignite the gas burner 1 B without flowing cooling water through the cooling water pipe 23 and the high temperature regenerator 1 heats the rare absorbent, The evaporated refrigerant enters the absorber 5 / evaporator 4 mainly from the middle of the refrigerant pipe 14 through the refrigerant pipe 17 having a low flow resistance, and heats through the water supplied from the cold / hot water pipe 22 and the heat transfer pipe 4A. The water that flows through the heat transfer tube 4A is heated mainly by the heat of condensation at this time.
[0020]
The refrigerant condensed by performing the heating action in the evaporator 4 enters the absorber 5 through the refrigerant pipe 18 and is mixed with the absorption liquid flowing in from the absorption liquid pipe 11 by evaporating and separating the refrigerant in the high temperature regenerator 1, It is sent to the high temperature regenerator 1 through the low temperature heat exchanger 6 and the high temperature heat exchanger 7 by the operation of the absorption liquid pump 13.
[0021]
And heating operation etc. are performed by circulatingly supplying the hot water heated with the heat exchanger tube 4A inside the evaporator 4 to the indoor unit which is not shown in figure via the cold / hot water piping 22. FIG.
[0022]
Reference numeral 40 denotes a control device provided in the dual-effect absorption chiller / heater having the above-described operation function. For example, as shown in FIG. 2, an MPU (microprocessor unit) 231; a ROM 232A for storing a program; A RAM 232B for storing data and the like, input / output interfaces 233, 234, 237, and 238 serving as communication means, and the like are provided for the control valve motor 26 that drives the heat input control valve 25 of the gas burner 1B, the display 41, and the like. A control signal is output.
[0023]
The I / O interface 234 of the control device 40 includes a temperature sensor 42 that is provided at the inlet of the evaporator 4 of the cold / hot water pipe 22 and measures the temperature of the cold / hot water flowing into the evaporator 4, and the cold / hot water pipe. A temperature sensor 43 for measuring the temperature of the cold / hot water flowing from the evaporator 4 to the cold / hot water pipe 22 and an absorber 5 provided at the inlet of the absorber 5 of the cooling water pipe 23. 5 is a temperature sensor 44 that measures the temperature of the cooling water flowing into the cooling water 5, and a temperature that is provided at the outlet of the condenser 3 of the cooling water pipe 23 and measures the temperature of the cooling water that has flowed out of the condenser 3 into the cooling water pipe 23. A sensor 45, a temperature sensor 46 provided at the outlet of the condenser 3 in the refrigerant pipe 15 and measuring the temperature of the refrigerant flowing out of the condenser 3 into the refrigerant pipe 15, and provided at the outlet of the evaporator 4 in the refrigerant pipe 16. And evaporator 4 A temperature sensor 47 for measuring the temperature of the refrigerant flowing out to the refrigerant pipe 16, a temperature sensor 48 for measuring the temperature of the exhaust gas provided in the exhaust pipe of the gas burner 1B, and a high temperature regenerator 1 provided in the high temperature regenerator 1 A temperature sensor 49 for measuring the temperature of the absorption liquid, and a temperature sensor 50 for measuring the temperature of the absorption liquid provided at the outlet of the low temperature regenerator 2 of the absorption liquid pipe 10 and flowing out from the low temperature regenerator 2 to the absorption liquid pipe 10. And are connected.
[0024]
In this case, the temperature sensors 42 to 50 are connected via a coupler to a signal line 39 (indicated by a one-dot chain line in FIG. 1) consisting of a single jumper wiring, and this signal line 39 is connected to the I of the control device 40. / O interface 234 is connected.
[0025]
That is, the MPU 231 of the control device 40 performs communication such as data exchange with the temperature sensors 42 to 50 via the I / O interface 234 and the signal line 39. The ROM 232A and the RAM 232B identify a communication protocol for performing data communication with the temperature sensors 42 to 50 and the temperature sensors 42 to 50 together with a program for controlling the control valve motor 26 of the heat input control valve 25 and the like. Software to do this is set.
[0026]
The temperature sensors 42 to 50 all have the same configuration, and the configuration will be described using the temperature sensor 42 as an example. As shown in FIG. 3, the temperature sensor 42 includes an MPU 243 that is a sensor side control means, a memory 244 that is a storage means, an I / O interface 246 that is a communication means, an A / D converter 247, and an A A sensor unit 248 as a temperature detection element connected to the / D converter 247, a capacitor 249 as a power storage element, a diode 251 as a rectifying element, and the like.
[0027]
In this case, the capacitor 249 is connected to the output side of the diode 251, and each element is connected to a connection point between the diode 251 and the capacitor 249. In addition, a signal waveform shaping diode 255 is additionally connected between the input side of the diode 251 of the temperature sensor 42 and the ground. For example, a potential (high potential) of + 5V is applied to the signal line 39, and the data is constituted by a pulse that drops from this high potential to a low potential of 0V, for example.
[0028]
When the temperature sensor 42 is connected to the signal line 39, power is supplied to the respective elements while the high potential and low potential pulse signals constituting the data are at high potential, and the capacitor 249 is also charged. The While the potential is low, the capacitor 249 is discharged to provide power for each element.
[0029]
The temperature sensor 42 is also provided with a Vcc (DC + 5V) power supply terminal 245, which is connected to a connection point between the diode 251 and the capacitor 249. If the temperature sensor 42 connects the Vcc power supply terminal 245 to the power supply line, Each element is configured to be able to operate even by power supply from a power line. That is, in this case, each element operates without charging the capacitor 249, so that convenience is improved when the temperature sensor 42 is desired to be operated quickly at the time of inspection or the like.
[0030]
The MPU 243 takes in the temperature data measured by the sensor unit 248 via the A / D converter 247 and temporarily writes it in the memory 244. When the I / O interface 246 polls the control device 40 via the signal line 39, the temperature data written in the memory 244 is transferred to the control device 40 via the signal line 39 by the I / O interface 246. Send.
[0031]
Here, the memory 244 stores an ID code of the temperature sensor 42 itself, identification data indicating that the sensor is a sensor, set value data such as an alarm temperature, a protocol for performing communication with the control device 40, and the like. .
[0032]
Further, when the total extension of the signal line 39 becomes longer, the signal is distorted. However, since the waveform shaping diode 255 is connected to the temperature sensor 42, the distortion of the signal waveform is corrected and the above-described Data transmission / reception is ensured.
[0033]
When the temperature sensors 42 to 50 are connected to the signal line 39 and the power is turned on, the MPU 231 of the control device 40 first scans the connection status of each temperature sensor to the signal line 39. Each MPU 243 of the temperature sensors 42 to 50 returns its own ID code stored in the memory 244 in response to polling from the control device 40. The MPU 231 of the control device 40 identifies the connection status of the temperature sensors 42 to 50 based on the returned ID code and holds it in the RAM 232B, and thereafter uses this ID code to communicate temperature data with the temperature sensors 42 to 50, etc. Will do.
[0034]
And MPU231 of the control apparatus 40 polls the temperature sensors 42-50 with a predetermined period. This polling is performed based on the aforementioned ID code. In response to this polling, the MPUs 243 of the temperature sensors 42 to 50 transmit temperature data to the control device 40 as described above. The MPU 231 of the control device 40 once writes the received temperature data into the RAM 232B, and executes control of each device based on the temperature data as described later.
[0035]
However, when the temperature data is transmitted, the A / D converter 247 may be temporarily or continuously locked due to electrical noise, for example, and normal temperature data may not be transmitted to the control device 40. The controller 40 can determine whether the temperature data transmitted from 42 to 50 is true or false.
[0036]
That is, in this absorption chiller / heater, since water flows inside the chilled / hot water pipe 22, the cooling water pipe 23, and the refrigerant pipes 15 and 16, the temperature measured by the temperature sensors 42 to 47 installed in each of them. None of them is lower than 0 ° C. Moreover, even in the cooling operation performed when the outside air temperature is high, it is normal that the temperature of the room where the indoor unit is installed (in the case of a general room where no heating appliance is installed) or the outside air exceeds 60 ° C. Since it is unthinkable, it cannot be considered that the temperature measured by the temperature sensors 42 to 47 exceeds 60 ° C. during the cooling operation.
[0037]
For this reason, the temperature sensors 42 to 47 measure during the cooling operation, and it is first determined whether or not the temperature data written in the RAM 232B of the control device 40 falls within the range of 0 to 60 ° C. When the temperature data is, the determination program for determining that an abnormality has occurred in the temperature sensor that measured the temperature data is stored in the ROM 232A of the control device 40.
[0038]
On the other hand, the temperature of hot water flowing through the cold / hot water pipe 22 during the heating operation performed when the outside air temperature is low and heated mainly by exchanging heat with refrigerant vapor in the heat transfer pipe 4A in the evaporator 4 exceeds 100 ° C. Since it is not empirical, it is determined whether or not the temperature data measured by the temperature sensors 42 and 43 during the heating operation and written in the RAM 232B of the control device 40 falls within the range of 0 to 100 ° C. When the temperature data is out of the range, a determination program for determining that an abnormality has occurred in the temperature sensor that measured the temperature data is stored in the ROM 232A of the control device 40.
[0039]
Further, the temperature of the exhaust gas emitted from the gas burner 1B measured by the temperature sensor 48 during steady operation and the opening of the heat input control valve 25 have a correlation. For example, the temperature sensor 48 actually measures the temperature range shown in the relationship diagram between the opening degree of the heat input control valve 25 and the exhaust gas temperature shown in FIG. 4 and obtained in advance in the RAM 232B of the control device 40. When the written temperature data is shifted by 25% or more, for example, both above and below, it should be considered that an abnormality has occurred in the temperature sensor 48, and a determination program for performing this determination is also stored in the ROM 232A of the control device 40. I remember it.
[0040]
Similar to the exhaust gas temperature, there is also a correlation between the temperature of the absorbent in the high-temperature regenerator 1 measured by the temperature sensor 49 during steady operation and the opening of the heat input control valve 25. Therefore, for example, the temperature sensor 49 actually measures the temperature range shown in the relationship diagram between the opening degree of the heat input control valve 25 and the absorption liquid temperature shown in FIG. When the temperature data written in the RAM 232B deviates by 25% or more, for example, both above and below, it should be considered that an abnormality has occurred in the temperature sensor 49. A determination program for performing this determination is also included in the control device 40. It is stored in the ROM 232A.
[0041]
Further, since the temperature of the absorbent flowing out from the low temperature regenerator 2 to the absorbent liquid pipe 10 during the cooling operation does not empirically fall outside the range of 0 to 95 ° C., the temperature sensor 50 that measures the temperature of that portion. When the temperature data actually measured and written in the RAM 232B of the control device 40 is out of the range of 0 to 95 ° C., it should be considered that an abnormality has occurred in the temperature sensor 50, and this determination is made. Is also stored in the ROM 232A of the control device 40.
[0042]
In addition, since the fluid does not flow through the cooling water pipe 23, the refrigerant pipes 15 and 16, and the absorption liquid pipe 10 during the heating operation, the temperature sensors 44 to 47 and 50 installed in these pipes are in the heating operation. Does not need to be operated. For this reason, the determination is not performed for the temperature sensors 44 to 47 and 50 during the heating operation.
[0043]
Further, since the temperature sensors other than the temperature sensor 48 measure the temperature of the refrigerant (water) or the absorbing liquid having a large specific heat, a sudden fluctuation exceeding 10 ° C./second usually cannot occur. For this reason, in the temperature sensors other than the temperature sensor 48, when the temperature sensor actually measures and the temperature data written in the RAM 232B of the control device 40 fluctuates exceeding 10 ° C./second, the temperature data is measured. It should be considered that an abnormality has occurred in the temperature sensor, and a determination program for making this determination is also stored in the ROM 232A of the control device 40.
[0044]
On the other hand, the temperature of the fluid measured by the temperature sensors 42 to 50 has been empirically confirmed to exceed 0.1 ° C. even during steady operation. For this reason, when the temperature sensor actually measures and the temperature data written in the RAM 232B of the control device 40 has not been confirmed to change by 0.1 ° C. over a predetermined time, the temperature sensor that has measured the temperature data is used. It should be considered that an abnormality has occurred, and a determination program for performing this determination is also stored in the ROM 232A of the control device 40.
[0045]
When the temperature sensors 42 to 50 measure and it is determined that the temperature data written in the RAM 232B of the control device 40 is not normal temperature data, the temperature data written in the RAM 232B is discarded and the temperature is immediately measured. A program for outputting a request to be transmitted again to the control device 40 to the temperature sensor is also stored in the ROM 232A of the control device 40.
[0046]
Then, it is determined whether or not the temperature data retransmitted and rewritten in the RAM 232B of the control device 40 is normal in the same manner as described above. When it is determined that the temperature data is normal, the control is performed. The control of each device is executed based on the temperature data rewritten in the RAM 232B of the device 40, and when it is determined that the device is not normal, further measurement and transmission of the temperature data are requested, received, and received in the RAM 232B of the control device 40. When it is determined that the written temperature data is normal, control of each device is executed based on the temperature data determined to be normal, and when it is determined that the temperature data is not normal, the I / O is performed. A necessary control signal is transmitted to the display device 41 through the interface 233, and the number of the temperature sensor in which the abnormality has occurred is displayed to the device administrator. It is adapted to notify the occurrence.
[0047]
For example, when it is determined that the temperature data measured by the temperature sensor 42 during the cooling operation and the temperature data of the chilled water written in the RAM 232B of the control device 40 is normal, the MPU 231 of the control device 40 uses the case of a conventionally known control device. Similarly, the written cold water temperature data is compared with a set temperature (for example, + 7 ° C.), and the higher the cold water temperature data is, the higher the opening degree of the heat input control valve 25 is. The control valve motor 26 is operated, and the control valve motor 26 is operated so that the opening degree of the heat input control valve 25 becomes smaller as the temperature data of the cold water is lower than the set temperature. Yes.
[0048]
Further, when it is determined that the temperature data of the hot water measured by the temperature sensor 42 during the heating operation and written in the RAM 232B of the control device 40 is normal, the MPU 231 of the control device 40 in this case also uses a conventionally known control device. Similarly to the case, the written temperature data of the warm water is compared with a set temperature (for example, + 45 ° C.), and the lower the temperature data of the warm water is, the larger the opening degree of the heat input control valve 25 is. The control valve motor 26 is operated so that the higher the temperature data of the hot water is, the more the control valve motor 26 is operated so that the opening degree of the heat input control valve 25 becomes smaller.
[0049]
Further, the MPU 231 of the control device 40 is measured based on the difference in temperature data of the cold / hot water measured by the temperature sensors 42 and 43 installed at the inlet / outlet portion of the evaporator 4 of the cold / hot water pipe 22 and written in the RAM 232B of the control device 40. To execute load control. In addition, the MPU 231 of the control device 40 is measured by the temperature sensor 47 installed at the outlet of the evaporator 4 of the refrigerant pipe 16 and the refrigerant freeze protection operation based on the refrigerant temperature data written in the RAM 232B of the control device 40. Execute. Note that these controls are also executed after the temperature sensors 42, 43, and 47 measure and the temperature data written in the RAM 232B of the control device 40 is normal.
[0050]
Further, the MPU 231 of the control device 40 is measured by the temperature sensors 44 and 45, and based on the difference in the temperature data of the cooling water written in the RAM 232B of the control device 40 or by the temperature sensor 49, Based on the temperature data of the high temperature regenerator 1 written in the RAM 232B (eg, abnormal when temperature data exceeding + 160 ° C. is measured), the temperature sensor 48 further measures and writes it in the RAM 232B of the control device 40. Based on the temperature data of the exhaust gas of the gas burner 1B (for example, abnormal when temperature data exceeding 250 ° C. is measured), a predetermined protection operation (for example, stop of operation) corresponding to each is executed, and a temperature sensor Based on the temperature data measured by 46 and 49 and written in the RAM 232B of the control device 40, the low-temperature regenerator 2 The concentration of the concentrated absorbent in the absorbent pipe 10 supplied to the absorber 5 is calculated, and control is performed to maintain the concentration at a reference concentration, for example, 64%. These controls are also executed by measuring each temperature sensor and confirming that the temperature data written in the RAM 232B of the control device 40 is normal.
[0051]
The control device 40 measures and transmits the temperature data when the temperature sensors 42 to 50 measure and transmit the temperature data written in the RAM 232B as abnormal temperature data. It is also possible to output a control signal for returning the A / D converter 247 of the temperature sensor to the initial state for the transmitted temperature sensor.
[0052]
When the control device 40 is configured in this way, when the A / D converter 247 of the temperature sensors 42 to 50 that have transmitted abnormal temperature data is temporarily locked due to noise, for example, the A / D The converter 247 immediately returns to a normal state, and the temperature is correctly measured in the next measurement, so that normal temperature data is transmitted to the control device 40.
[0053]
In this case, the determination program determines that the temperature data re-measured by the temperature sensor in which the A / D converter 247 has returned to the initial state, retransmitted, and rewritten in the RAM 232B is not normal temperature data. When the control device 40 is configured to output a necessary control signal for returning the A / D converter 247 to the initial state again, and after that, temperature data that is not normal is measured and transmitted. Then, a necessary control signal is transmitted to the display device 41 via the I / O interface 233 and the number of the temperature sensor in which the abnormality has occurred is displayed to notify the apparatus administrator of the occurrence of the abnormality.
[0054]
The control signal for returning the A / D converter 247 of the temperature sensors 42 to 50 to the initial state is output when abnormal temperature data is continuously transmitted a predetermined number of times, for example, twice continuously. You may comprise so that it may do.
[0055]
By the way, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit described in the claims.
[0056]
For example, the temperature of the cold water measured by the temperature sensor 42 during the cooling operation is higher than the temperature of the cold water measured by the temperature sensor 43, and the temperature of the hot water measured by the temperature sensor 42 during the heating operation is greater by the temperature sensor 43. It becomes lower than the temperature of the hot water to be measured. Further, the temperature of the cooling water measured by the temperature sensor 44 during the cooling operation is lower than the temperature of the cooling water measured by the temperature sensor 45, and the temperature of the refrigerant measured by the temperature sensor 46 is measured by the temperature sensor 47. It is lower than the temperature of the refrigerant. In addition, since the temperature of the absorbing liquid measured by the temperature sensor 49 is lower than the temperature of the absorbing liquid measured by the temperature sensor 50, an abnormality has occurred in one of the temperature sensors when this temperature relationship is broken. Therefore, a determination program for determining this may be stored in the ROM 232A of the control device 40.
[0057]
Further, regarding the temperature sensors 42 to 50 that measure the temperature before the absorption chiller / heater reaches the steady operation, the normality / abnormality of the temperature sensors 42 to 50 is determined in the same manner as in the steady operation. Can do.
[0058]
In addition, when it is confirmed that an abnormality has occurred in the temperature sensors 42 to 50, not only the indicator 41 but also the buzzer and the flashing of the light are used to notify the administrator more reliably. You may be able to.
[0059]
Moreover, since the semiconductor is used for the temperature sensors 42-50, there exists a possibility of malfunctioning if it installs in the environment over 150 degreeC at present, The temperature sensor 48 which measures the exhaust gas temperature of the gas burner 1B, and a high temperature regenerator The temperature sensor 49 for measuring the temperature of the absorbing liquid 1 is configured so that only the heat-resistant sensor unit 248 is installed at the position where the temperature is measured.
[0060]
【The invention's effect】
As explained above, According to the present invention, When the temperature measured and transmitted by the temperature sensor is out of the preset temperature range or when the temperature change rate is out of the preset speed range, the temperature data transmission path is abnormal. Since the control device discards the temperature data obtained as a result and asks for another measurement / transmission, even if there are noises and normal communication cannot be performed, control is performed based on the obtained abnormal temperature data. Never done.
[0061]
Also, According to the present invention, If there is a temperature sensor that cannot measure and transmit normal temperature data even after repeated measures against abnormality, an alarm can be issued to notify the device manager or the like of the abnormality of the temperature sensor.
[0062]
Also, According to the present invention, When the temperature measured and transmitted by the temperature sensor is outside the preset temperature range, or when the temperature change rate is outside the preset speed range, the temperature sensor that detects the temperature is controlled. Since the initial state return instruction signal can be output to the device, even if there is a temperature sensor that cannot communicate normally due to noise, control is not performed based on the abnormal temperature data. Recovery.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing a configuration of an absorption chiller / heater.
FIG. 2 is an explanatory diagram showing a configuration of a temperature measurement system.
FIG. 3 is an explanatory diagram showing a configuration of a temperature sensor.
FIG. 4 is an explanatory diagram showing the relationship between the valve opening of the fuel control valve and the exhaust gas temperature.
FIG. 5 is an explanatory diagram showing the relationship between the valve opening of the fuel control valve and the (dense) absorbent temperature.
[Explanation of symbols]
1 High temperature regenerator
1B Gas burner
2 Low temperature regenerator
3 Condenser
3A Heat transfer tube
4 Evaporator
4A Heat transfer tube
5 absorber
5A Heat transfer tube
6 Low temperature heat exchanger
7 High temperature heat exchanger
8-11 Absorption liquid tube
13 Absorption liquid pump
14-18 Refrigerant piping
19 Refrigerant pump
22 Cold and hot water pipes
23 Cooling water piping
24 Gas supply pipe
25 Heat input control valve
26 Control valve motor
27-29 On-off valve
39 Signal line
40 Control device
41 Display
42-50 temperature sensor
231 MPU
232A ROM
232B RAM
233, 234, 237, 238 interface
243 MPU
244 memory
246 interface
247 A / D converter
248 Sensor unit

Claims

Heat that is cooled or heated through the heat transfer tubes installed inside the evaporator by circulating the absorbent and refrigerant through high-temperature regenerators, low-temperature regenerators, condensers, evaporators, and absorbers connected by piping The operation fluid is supplied to the air conditioning load, and temperature data detected by the temperature sensor via a temperature sensor and a signal line provided in each part with a control unit is collected to the control device by a communication protocol to perform cooling operation or In an absorption chiller / heater that performs heating operation, means for determining that the temperature data transmitted from the temperature sensor is out of a preset temperature range, and determining that the temperature data is abnormal due to the determination. If it is, means for transmitting a control signal Shoyo for returning the a / D converter of the corresponding temperature sensor to an initial state, and transmit the control signal of the Shoyo the temperature When the temperature data transmitted from the sensor is out of a preset temperature range, the control device includes means for determining that the temperature sensor is abnormal and notifying the administrator of the abnormality. Absorption chiller / heater.

Heat that is cooled or heated through the heat transfer tubes installed inside the evaporator by circulating the absorbent and refrigerant through high-temperature regenerators, low-temperature regenerators, condensers, evaporators, and absorbers connected by piping The operation fluid is supplied to the air conditioning load, and temperature data detected by the temperature sensor via a temperature sensor and a signal line provided in each part with a control unit is collected to the control device by a communication protocol to perform cooling operation or In an absorption chiller / heater that performs heating operation, when a change speed of the temperature data transmitted from the temperature sensor is out of a preset speed range, a means for determining that the temperature sensor that measures the temperature is abnormal If, when the temperature data is determined to be abnormal by said determination, sending a control signal Shoyo for returning the appropriate temperature sensor a / D converter to an initial state If the change rate of the temperature data transmitted from the temperature sensor is out of the preset speed range even if the desired control signal is transmitted, it is determined that the temperature sensor is abnormal. An absorption chiller / heater characterized in that the control device is provided with means for notifying an administrator of abnormality.

Thermal operation in which the absorption liquid and the refrigerant are circulated through a high-temperature regenerator, a low-temperature regenerator, a condenser, an evaporator, an absorber, etc. connected by piping, and cooled through a heat transfer tube installed inside the evaporator. In an absorption chiller / heater that performs a cooling operation for supplying fluid to an air conditioning load and a heating operation for supplying a thermal operation fluid heated through the heat transfer tube to the air conditioning load, the temperature of the heat operation fluid flowing into the heat transfer tube The temperature sensor 42 for measuring the temperature, the temperature sensor 43 for measuring the temperature of the thermal operation fluid flowing out from the heat transfer tube, and the absorber of the cooling water pipe 23 arranged so that the cooling water flows from the absorber to the condenser A temperature sensor 44 for measuring the coolant temperature at the inlet, a temperature sensor 45 for measuring the coolant temperature at the outlet of the condenser, a temperature sensor 46 for measuring the temperature of the refrigerant flowing out of the condenser, A temperature sensor 47 for measuring the temperature of the refrigerant flowing out of the generator 4, a temperature sensor 48 for measuring the exhaust gas temperature of the gas burner of the high temperature regenerator, and a temperature sensor for measuring the temperature of the absorbing liquid in the high temperature regenerator 49, a temperature sensor 50 for measuring the temperature of the absorbing liquid flowing out from the low-temperature regenerator, and an operating function part such as a circulating means for circulating the absorbing liquid and the refrigerant based on the temperature information obtained from each temperature sensor. And a control device 40 that outputs a control signal. In the control device 40, the temperature measured by the temperature sensor 42 is higher than the temperature measured by the temperature sensor 43 during the cooling operation, and the temperature sensor 42 measures the temperature during the heating operation. The temperature is lower than the measured temperature of the temperature sensor 43, and during the cooling operation, the measured temperature of the temperature sensor 44 is lower than the measured temperature of the temperature sensor 45. When the temperature relationship where the measured temperature of the temperature sensor 46 is lower than the measured temperature of the temperature sensor 47 and the measured temperature of the temperature sensor 49 is lower than the measured temperature of the temperature sensor 50 is broken, an abnormality occurs in the temperature sensor. And a control signal for returning the A / D converter of the corresponding temperature sensor to the initial state when the temperature data is determined to be abnormal by the determination. Absorption chiller / heater characterized by comprising means for transmitting

Thermal operation in which the absorption liquid and the refrigerant are circulated through a high-temperature regenerator, a low-temperature regenerator, a condenser, an evaporator, an absorber, etc. connected by piping, and cooled through a heat transfer tube installed inside the evaporator. In an absorption chiller / heater that performs a cooling operation for supplying fluid to an air conditioning load and a heating operation for supplying a thermal operation fluid heated through the heat transfer tube to the air conditioning load, the temperature of the heat operation fluid flowing into the heat transfer tube The temperature sensor 42 for measuring the temperature, the temperature sensor 43 for measuring the temperature of the thermal operation fluid flowing out from the heat transfer tube, and the absorber of the cooling water pipe 23 arranged so that the cooling water flows from the absorber to the condenser A temperature sensor 44 for measuring the coolant temperature at the inlet, a temperature sensor 45 for measuring the coolant temperature at the outlet of the condenser, a temperature sensor 46 for measuring the temperature of the refrigerant flowing out of the condenser, A temperature sensor 47 for measuring the temperature of the refrigerant flowing out of the generator 4, a temperature sensor 48 for measuring the exhaust gas temperature of the gas burner of the high temperature regenerator, and a temperature sensor for measuring the temperature of the absorbing liquid in the high temperature regenerator 49, a temperature sensor 50 for measuring the temperature of the absorbing liquid flowing out from the low-temperature regenerator, and an operating function part such as a circulating means for circulating the absorbing liquid and the refrigerant based on the temperature information obtained from each temperature sensor. And a control device 40 that outputs a control signal. During the cooling operation, the control device 40 abnormalizes the temperature sensor when the temperature data measured by the temperature sensors 42 to 50 deviates from the preset temperature range. determines that there is, during the heating operation without performing the determination of the temperature sensor 44～47,50 of the determination, and the temperature sensor 44 - 47 and When the temperature change rate obtained from 9 to 50 is out of the preset speed range, the temperature sensor that measures the temperature has a function of determining that there is an abnormality, and the temperature data is abnormal due to the determination. An absorption chiller / heater characterized by comprising means for transmitting a control signal for returning an A / D converter of a temperature sensor that measures the temperature when it is determined to be present to an initial state.

The desired control signal for returning to the initial state is output when the temperature data determined to be abnormal is continuously transmitted a predetermined number of times. The absorption cold / hot water machine in any one.