JPS6044683B2 - temperature control device - Google Patents
temperature control deviceInfo
- Publication number
- JPS6044683B2 JPS6044683B2 JP52029952A JP2995277A JPS6044683B2 JP S6044683 B2 JPS6044683 B2 JP S6044683B2 JP 52029952 A JP52029952 A JP 52029952A JP 2995277 A JP2995277 A JP 2995277A JP S6044683 B2 JPS6044683 B2 JP S6044683B2
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- set value
- change rate
- output
- section
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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- Air Conditioning Control Device (AREA)
- Control Of Temperature (AREA)
Description
【発明の詳細な説明】
この発明は冷暖房機器に用いられる温度制御装置に関
するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a temperature control device used in heating and cooling equipment.
従来、冷暖房機、例えば空気調和機に用いられる温度
制御装置は被空調室の温度が第1の設定値になつたとき
オン信号を出力し、第2の設定値になつたときオフ信号
を出力して空気調和機の運転をオン・オフ制御するもの
であつた。Conventionally, temperature control devices used in air conditioners, such as air conditioners, output an on signal when the temperature of the conditioned room reaches a first set value, and output an off signal when the temperature reaches a second set value. This was used to control on/off operation of the air conditioner.
従つて空調負荷が大きいときは第2の設定値付近から第
2の設定値に到達するまで極めて長時間空気調和機を運
転しなければならない場合が生じる。これは僅かな温度
を得るために多大の電力あるいは燃料を消費することに
なりエネルギー有効利用の観点から望しいことではない
。 上記のことを冷房運転時を例にとつて図面によりさ
らに説明する。Therefore, when the air conditioning load is large, the air conditioner may have to be operated for an extremely long time from around the second set value until reaching the second set value. This consumes a large amount of power or fuel to obtain a small temperature, which is not desirable from the viewpoint of effective energy utilization. The above will be further explained with reference to the drawings, taking the cooling operation as an example.
第1図は被空調室の温度変化図でTAは第1の設定値温
度、即ち空気調和機の運転開始温度、TBは第2の設定
値温度、即ち運転停止温度てある。Tcは温度制御装置
の作動温度巾でTO=TA−TBで表わされ通常は約3
゜Cに設定される。区間イおよび叫まそれぞれ空気調和
機の運転時間および停止時間を示す。この図から明らか
なように運転時間イにおける後半の点線で示す区間ハで
は温度変化は極めて緩やかになつている。このような運
転例は日中の外気温度が高い場合、あるいは被冷房室に
多人数が在室している場合等にはしはしばみられ、室温
を僅か約0.5℃下げるために空気調和機運転時間の半
分を費やしていることもある。この発明は上記の点に鑑
みなされたもので被冷暖房環境の温度変化率を検出し、
この温度変化率が予め設定した所定の変化率より小さく
なつたとき、第2の設定値あるいは第1、第2の両設定
値を変更して、前の設定温度以前に冷暖房機器の運転を
停止させるものである。FIG. 1 is a temperature change diagram of an air conditioned room, where TA is the first set point temperature, that is, the operation start temperature of the air conditioner, and TB is the second set point temperature, that is, the operation stop temperature. Tc is the operating temperature range of the temperature control device, expressed as TO=TA-TB, and is usually about 3
It is set to °C. Sections 1 and 2 indicate the operation time and stop time of the air conditioner, respectively. As is clear from this figure, temperature changes are extremely gradual in section C, indicated by the dotted line, in the latter half of operation time A. This type of operation is often seen when the outside temperature is high during the day or when a large number of people are in the room to be cooled. Sometimes it takes up half of the time to run the air conditioner. This invention was made in view of the above points, and detects the rate of temperature change in the environment to be cooled and heated.
When this temperature change rate becomes smaller than a predetermined rate of change, the second set value or both the first and second set values are changed to stop the operation of the air conditioning equipment before the previous set temperature. It is something that makes you
以下図面に従いこの発明の詳細について説明する。The details of this invention will be explained below with reference to the drawings.
第2図はこの発明の一実施例を示すプロツク図で1は温
度検出素子、2は冷暖房機器の運転をオンさせる第1の
設定値ならびに運転をオフさせる第2の設定値を設定す
る温度設定部、3は上記温度検出素子1からの出力と温
度設定部2からの第1の設定値を比較し、温度検出素子
1の出力の方か大きいときオン信号を出力する第1の比
較器、4は同じく上記温度検出素子1からの出力と温度
設定部2からの第2の設定値を比較し、温度検出素子1
の出力の方が小さいときオフ信号を出力する第2の比較
器、5は上記温度検出素子1の出力を入力し、ある微小
時間における出力の変化DT/Dt(但しTは出力差、
tは時間)即ち温度変化率を算出する演算回路部、6は
予め所定の温度変化率を設定するための温度変化率設定
部、7はこの温度変化率設定部6の出力と上記演算回路
部5の出力とを比較し、演算回路部5の出力の方が小さ
いとき出力を発生する温度変化率比較部である。なお上
記演算回路部5と温度変化率設定部6、および温度変化
率比較部7とで設定値変更部8を構成している。このよ
うに構成されたものにあつて、その動作を冷房機の場合
について述べると、室温が第1の設定値温度よりも高い
場合は、温度検出素子1の出力の方が第1の設定値より
大きいので第1の比較器3からはオン信号が出て冷房機
(図示せず)を運転する。FIG. 2 is a block diagram showing an embodiment of the present invention, in which 1 is a temperature detection element, 2 is a temperature setting that sets a first set value for turning on the operation of the air conditioning equipment and a second set value for turning off the operation. Section 3 is a first comparator that compares the output from the temperature detection element 1 and the first set value from the temperature setting section 2, and outputs an on signal when the output of the temperature detection element 1 is larger; 4 also compares the output from the temperature detection element 1 and the second set value from the temperature setting section 2, and
A second comparator 5 which outputs an off signal when the output of
t is time), that is, an arithmetic circuit unit that calculates the rate of temperature change; 6 is a temperature change rate setting unit that sets a predetermined temperature change rate; 7 is the output of this temperature change rate setting unit 6 and the arithmetic circuit unit. This is a temperature change rate comparison section that compares the output of the arithmetic circuit section 5 with the output of the arithmetic circuit section 5 and generates an output when the output of the arithmetic circuit section 5 is smaller. Note that the arithmetic circuit section 5, the temperature change rate setting section 6, and the temperature change rate comparison section 7 constitute a set value changing section 8. Regarding the operation of an air conditioner configured in this way, when the room temperature is higher than the first set value temperature, the output of the temperature detection element 1 is higher than the first set value temperature. Since it is larger, the first comparator 3 outputs an on signal to operate the air conditioner (not shown).
この冷房機の運転により室温が第2の設定値温度より低
くなると温度検出素子1の出力の方が第2の設定値より
小さくなるので第2の比較器4からはオフ信号が出て冷
房機の運転を停止する。なお第1、第2の比較器3,4
は一度オン・オフ信号が発生すると他の比較器4,3か
らオフあるいはオン信号が発生するまでその出力を発生
しつづけるものである。このように冷房機は通常の場合
第1図に示す温度差(デイフアレンシ”ヤル)Tcでオ
ン・オフ運転を行なう。ところが冷房負荷が大きく第1
図点線に示す特性になつたとき、演算回路部5は温度検
出素子1からの出力により常時その出力変化率DT/D
tl即ち温度変化率を算出し、この温度変化率を温度変
化率比較部7で温度変化率設定部6からの所定温度変化
率と比較し、室内の温度変化率が所定温度変化率より小
さくなると、即ち温度T。の時点で温度変化率比較部7
から出力を発生し、この出力により温度設定部2は第2
の設定値をTBからTDに変更するので第2の比較器4
からはオフ信号が出て冷房機の運転を停止する。つぎに
第3図により温度検出素子1と温度設定部2ならびに第
1、第2比較器3,4の具体的構成例について述べる。When the room temperature becomes lower than the second set value temperature due to the operation of the air conditioner, the output of the temperature detection element 1 becomes smaller than the second set value, so the second comparator 4 outputs an off signal and the air conditioner is turned off. stop operating. Note that the first and second comparators 3 and 4
Once an on/off signal is generated, it continues to generate that output until an off or on signal is generated from the other comparators 4 and 3. In this way, the air conditioner normally operates on and off with the temperature difference Tc shown in Figure 1.However, the cooling load is large and the
When the characteristic shown in the dotted line in the figure is reached, the arithmetic circuit section 5 constantly changes the output change rate DT/D based on the output from the temperature detection element 1.
tl, that is, the temperature change rate is calculated, and the temperature change rate comparing section 7 compares this temperature change rate with a predetermined temperature change rate from the temperature change rate setting section 6, and when the indoor temperature change rate becomes smaller than the predetermined temperature change rate. , that is, the temperature T. At the point in time, the temperature change rate comparison section 7
generates an output, and this output causes the temperature setting section 2 to set the second
Since the setting value of is changed from TB to TD, the second comparator 4
An off signal is issued and the air conditioner stops operating. Next, a specific example of the configuration of the temperature detection element 1, temperature setting section 2, and first and second comparators 3 and 4 will be described with reference to FIG.
この図で1は温度検出素子としてのNTCサーミスタ、
9,10,11,12,13はそれぞれこのNTCサー
ミスタ1とブリツジ回路を構成する抵抗で、抵抗10は
その両端が短絡されるか否かで第1の設定値と第2の設
定値を定め、抵抗12は同じくその両端が短絡されるこ
とにより第2の設定値を変更するものでこれが温度設定
部2を構成する。In this figure, 1 is an NTC thermistor as a temperature detection element.
9, 10, 11, 12, and 13 are resistors that constitute a bridge circuit with this NTC thermistor 1, and the first set value and the second set value of the resistor 10 are determined depending on whether or not both ends thereof are short-circuited. Similarly, the resistor 12 changes the second set value by short-circuiting both ends thereof, and this constitutes the temperature setting section 2.
14は差動増巾器で上記ブリツジ回路のバランスを検出
し、(+)側入力が(−)側入力に比べ所定レベル高く
なるとLO出力を生じるもので第1、第2の比較器の役
割を果すものである。14 is a differential amplifier that detects the balance of the bridge circuit and produces an LO output when the (+) side input is higher than the (-) side input by a predetermined level, and serves as the first and second comparators. It fulfills the following.
15は上記抵抗10の両端に設けられ、差動増巾器14
のLO出力でオンし抵抗10を短絡するスイツチング回
路、16は上記抵抗12の両端に設けられ、設定値変更
部8の温度変化率比較部7からの出力によりオンし抵抗
12を短絡するスイツチング回路、17は上記差動増巾
器14のHi出力で駆動され、LO出力で駆動を停止す
るリレーコイル、18は冷房機、19はその電源、20
は冷房機18をオン・オフするリレー接点で上記リレー
コイル17によつて動作するものである。15 is provided at both ends of the resistor 10, and a differential amplifier 14
A switching circuit 16 is provided at both ends of the resistor 12, and is turned on by the output from the temperature change rate comparator 7 of the set value changing section 8, and short-circuits the resistor 12. , 17 is a relay coil that is driven by the Hi output of the differential amplifier 14 and stops driving by the LO output, 18 is an air conditioner, 19 is its power source, 20
is a relay contact that turns on and off the air conditioner 18, and is operated by the relay coil 17.
このように構成された回路では室温が第2の設定値温度
よりも高い場合、NTCサーミスタ1の抵抗値が小さい
ため差動増巾器14の(+)側入力レベルは低く出力は
Hiとなりリレーコイル17が駆動されてリレー接点2
0をオンし冷房機18が運転される。In a circuit configured in this way, when the room temperature is higher than the second set value temperature, the resistance value of the NTC thermistor 1 is small, so the (+) side input level of the differential amplifier 14 is low, and the output becomes Hi and the relay is activated. Coil 17 is driven and relay contact 2
0 is turned on and the air conditioner 18 is operated.
この冷房機18の運転により室温が低くなるとNTCサ
ーミスタ1の抵抗値が高くなり、差動増巾器14の(+
)側入力レベルは高くなる。そして室温が第2の設定値
温度になると差動増巾器14の出力は反転してかとなり
リレーコイル17を解除し、リレー接点20がオフされ
て冷房機18の運転が停止されると同時にスイツチング
回路15をオンして抵抗10が短絡される。この抵抗1
0の短絡により差動増巾器14の(−)側入力レベルは
高くなり、出力がLOからHiに反転する値が第2の設
定値から別の値、即ち第1の設定値に変わる。冷房機1
8の運転停止により室温は上昇するが差動増巾器14の
(−)側入力レベルが高くなつた分だけ冷房機18の運
転は停止され、第1の設定値になると差動増巾器14の
出力は田からHiに変わる。この差動増巾器14の反転
によりリレーコイル17は再ひ駆動され、冷房機18の
運転を開始するとともにスイッチング回路15をオフし
て差動増巾器14の反転レベルを第2の設定値に変更す
る。一方演算回路部5から出力される室内の温度変化率
が温度変化率設定部6からの所定温度変化率より小さく
なると温度変化率比較部7から出力が発生し、スイツチ
ング回路部16をオンして抵抗12を短絡する。すると
差動増巾器14の(−)側入力レベルが高くなり第2の
設定値温度が高くなるのでその分だけ冷房機が早く運転
停止される。上記実施例ては第2の設定値のみを変更す
るものについて述べたが第1、第2の両設定値を変更.
して平均室温の設定値上げるようにしても同様の効果が
得られることは勿論である。第4図はこの発明の他の実
施態様を示すものであり、この図で1〜7は第2図の実
施例と同様のものである。When the room temperature decreases due to the operation of the air conditioner 18, the resistance value of the NTC thermistor 1 increases, and the (+) of the differential amplifier 14 increases.
) side input level becomes high. Then, when the room temperature reaches the second set value temperature, the output of the differential amplifier 14 is reversed and becomes inverted, releasing the relay coil 17, turning off the relay contact 20, and stopping the operation of the air conditioner 18. The switching circuit 15 is turned on and the resistor 10 is short-circuited. This resistance 1
Due to the short circuit of 0, the (-) side input level of the differential amplifier 14 becomes high, and the value at which the output is inverted from LO to Hi changes from the second set value to another value, that is, the first set value. Air conditioner 1
8, the room temperature rises, but the operation of the air conditioner 18 is stopped as the (-) side input level of the differential amplifier 14 becomes higher, and when it reaches the first set value, the differential amplifier 14 stops operating. The output of 14 changes from low to high. This reversal of the differential amplifier 14 drives the relay coil 17 again, starts the operation of the air conditioner 18, turns off the switching circuit 15, and sets the reversal level of the differential amplifier 14 to the second set value. Change to On the other hand, when the indoor temperature change rate output from the arithmetic circuit section 5 becomes smaller than the predetermined temperature change rate from the temperature change rate setting section 6, an output is generated from the temperature change rate comparison section 7, and the switching circuit section 16 is turned on. Resistor 12 is shorted. Then, the (-) side input level of the differential amplifier 14 becomes higher and the second set value temperature becomes higher, so that the air conditioner is stopped earlier. In the above embodiment, only the second set value is changed, but it is also possible to change both the first and second set values.
Of course, the same effect can also be obtained by increasing the set value of the average room temperature. FIG. 4 shows another embodiment of the present invention, in which numerals 1 to 7 are similar to the embodiment of FIG.
21は第1の設定値と第2の設定値・の中間に設けられ
た第3の設定値を定める中間温度設定部、22はこの第
3の設定値と温度検出素子1との出力を比較し、温度検
出素子1の出力か第3の設定値を越えたとき出力を発生
する第3の比較器、23はこの第3の比較器22と温度
変化率比較部7の両方に出力があるとき出力を発生する
アンドゲートでこのアンドゲートの出力により温度設定
部2を動作させて第2の設定値または第1、第2の両設
定値を変更する。21 is an intermediate temperature setting section that determines a third set value provided between the first set value and the second set value; 22 is a comparison between this third set value and the output of the temperature detection element 1; A third comparator 23 generates an output when the output of the temperature detection element 1 exceeds a third set value, and a third comparator 23 has an output for both the third comparator 22 and the temperature change rate comparator 7. The temperature setting section 2 is operated by the output of this AND gate to change the second set value or both the first and second set values.
なお設定値変更部8はこれら中間温度設定部21、第3
の比較器22およびアンドゲート23を包含して構成さ
れる。このように構成することにより第5図に示すよノ
うに室内温度が第3の設定値以下になりさらに第2の設
定値温度に到らずに温度変化率が所定温度変化率より小
さくなつたとき設定値を変更するようになるから負荷が
大きく室内温度が第1の設定値近辺TDで温度変化率が
所定の温度変化率より・も小ごくなつたとしても直ちに
設定値を変更して冷房機の運転を停止することがなく在
室者に不快感を与えることがない。Note that the set value changing unit 8 is connected to the intermediate temperature setting unit 21, the third
The circuit includes a comparator 22 and an AND gate 23. With this configuration, as shown in Fig. 5, the indoor temperature becomes lower than the third set value, and furthermore, the temperature change rate becomes smaller than the predetermined temperature change rate without reaching the second set value temperature. Since the set value will be changed when the load is large and the indoor temperature is around the first set value TD, the temperature change rate will be smaller than the predetermined temperature change rate, the set value will be changed immediately and cooling will start. The machine does not stop operating and does not cause discomfort to the occupants.
第6図はさらに他の実施態様を示すもので演算回路部5
と温度検出素子1の間にこの間の接続を”入切可能な切
離部24が設けられている。FIG. 6 shows still another embodiment, in which the arithmetic circuit section 5
A disconnection portion 24 is provided between the temperature detection element 1 and the temperature detection element 1, and is capable of turning on and off the connection therebetween.
この装置によれば設定値変更部8を必要に応じて付加し
たり切り離したりすることができる。なおこの切離部2
4は温度変化率比較部7と温度設定部2との間に設けて
もよいことは論をまたない。以上述べたようにこの発明
は第1の設定値で冷暖房機器をオンし、第2の設定値で
オフする温度制御装置にあつて、冷暖房機器の使用時に
おける被冷暖房物の温度変化率を算出し、この値が予め
設定した所定温度変化率より小さくなつたとき上記第2
の設定値あるいは第1、第2の設定値を変更しているの
で、従来効率の悪い冷暖房運転を行つていた部分での運
転停止を冷暖房環境の悪化をさほど招くことなくできる
ので経済的な運転を可能とする温度制御装置を提供する
ものである。According to this device, the setting value changing section 8 can be added or removed as necessary. Note that this separation part 2
4 may be provided between the temperature change rate comparing section 7 and the temperature setting section 2. As described above, the present invention is a temperature control device that turns on heating and cooling equipment with a first setting value and turns it off with a second setting value, and calculates the rate of temperature change of the object to be cooled and heated when the heating and cooling equipment is used. However, when this value becomes smaller than a predetermined temperature change rate, the second
By changing the setting value or the first and second setting values, it is possible to stop operation in areas where inefficient heating and cooling operations were performed without causing much deterioration of the heating and cooling environment, making it economical. The present invention provides a temperature control device that enables operation.
第1図は被空調室の冷房温度変化図、第2図はこの発明
の一実施例を示すプロツク図、第3図はその一部を詳細
にした電気回路図、第4図はこの発明の他の実施例を示
すプロツク図、第5図は異る冷暖房負荷時の被空調室の
冷房温度変化図、第6図はさらに他の実施例を示すプロ
ツク図である。
図中同一符号は同一または相当部分を示し、1は温度検
出素子、2は温度設定部、3は第1の比較器、4は第2
の比較器、5は演算回路部、6は温度変化率設定部、7
は温度変化率比較部、8は設定値変更部、18は冷房機
、21は中間温度設定部、22は第3の比較器、23は
アンドゲート、24は切離部である。Fig. 1 is a diagram of cooling temperature changes in an air-conditioned room, Fig. 2 is a block diagram showing an embodiment of the present invention, Fig. 3 is an electrical circuit diagram showing a part of it in detail, and Fig. 4 is a diagram of the cooling temperature of the air-conditioned room. FIG. 5 is a diagram showing changes in cooling temperature of an air-conditioned room under different heating and cooling loads, and FIG. 6 is a diagram showing still another embodiment. The same reference numerals in the figures indicate the same or equivalent parts, 1 is the temperature detection element, 2 is the temperature setting section, 3 is the first comparator, and 4 is the second
a comparator, 5 is an arithmetic circuit section, 6 is a temperature change rate setting section, 7 is a comparator;
8 is a temperature change rate comparison section, 8 is a set value change section, 18 is an air conditioner, 21 is an intermediate temperature setting section, 22 is a third comparator, 23 is an AND gate, and 24 is a separation section.
Claims (1)
検出素子の検出温度が予め設定した第1の設定値になつ
たときオン信号を、第2の設定値になつたときオフ信号
を出力し、熱源機をオン−オフ運転して被制御物の温度
制御を行なう温度制御装置において、上記両設定値間に
おける上記温度検出素子の検出温度変化率を算出し、こ
の変化率が予め設定された所定温度変化率より小さくな
つたとき、上記第2の設定値または第1、第2の両設定
値を変更する設定値変更部を備えたことを特徴とする温
度制御装置。 2 両設定値間に第3の設定値を設けて、検出温度がこ
の値を越えるとともに温度変化率が所定温度変化率より
小さいとき第2の設定値または第1、第2の両設定値を
変更するよう設定値変更部を構成したことを特徴とする
特許請求の範囲第1項記載の温度制御装置。 3 設定値変更動作を不動作にする切離部を内蔵して設
定値変更部を構成したことを特徴とする特許請求の範囲
第1項または第2項記載の温度制御装置。[Claims] 1. A temperature detection element that detects the temperature of a controlled object; when the detected temperature of this temperature detection element reaches a preset first setting value, an on signal is output, and the temperature reaches a second setting value. In a temperature control device that controls the temperature of a controlled object by outputting an off signal when the heat source device is turned on and off, the temperature change rate detected by the temperature detection element is calculated between the two set values, and Temperature control characterized by comprising a set value changing unit that changes the second set value or both the first and second set values when the rate of change becomes smaller than a predetermined temperature change rate. Device. 2 A third set value is provided between the two set values, and when the detected temperature exceeds this value and the temperature change rate is smaller than the predetermined temperature change rate, the second set value or both the first and second set values are set. 2. The temperature control device according to claim 1, wherein the set value changing section is configured to change the set value. 3. The temperature control device according to claim 1 or 2, wherein the set value changing section is configured by incorporating a disconnection section that disables the set value changing operation.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP52029952A JPS6044683B2 (en) | 1977-03-18 | 1977-03-18 | temperature control device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP52029952A JPS6044683B2 (en) | 1977-03-18 | 1977-03-18 | temperature control device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS53115490A JPS53115490A (en) | 1978-10-07 |
JPS6044683B2 true JPS6044683B2 (en) | 1985-10-04 |
Family
ID=12290312
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP52029952A Expired JPS6044683B2 (en) | 1977-03-18 | 1977-03-18 | temperature control device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6044683B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008209029A (en) * | 2007-02-23 | 2008-09-11 | Mitsubishi Heavy Ind Ltd | Air conditioner and automatic heating operation control method |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59166854A (en) * | 1983-03-14 | 1984-09-20 | Toyota Central Res & Dev Lab Inc | Limiting current type oxygen sensor |
JPS6124930A (en) * | 1984-07-16 | 1986-02-03 | Sanyo Electric Co Ltd | Supersonic humidifying device |
JPH0264806A (en) * | 1988-08-31 | 1990-03-05 | Sanyo Electric Co Ltd | Temperature controller |
JPH03171308A (en) * | 1989-11-30 | 1991-07-24 | Seikosha Co Ltd | Method and device for controlling thermal equipment |
-
1977
- 1977-03-18 JP JP52029952A patent/JPS6044683B2/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008209029A (en) * | 2007-02-23 | 2008-09-11 | Mitsubishi Heavy Ind Ltd | Air conditioner and automatic heating operation control method |
Also Published As
Publication number | Publication date |
---|---|
JPS53115490A (en) | 1978-10-07 |
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