JPH01217146A - Defrosting controlling method - Google Patents
Defrosting controlling methodInfo
- Publication number
- JPH01217146A JPH01217146A JP63040239A JP4023988A JPH01217146A JP H01217146 A JPH01217146 A JP H01217146A JP 63040239 A JP63040239 A JP 63040239A JP 4023988 A JP4023988 A JP 4023988A JP H01217146 A JPH01217146 A JP H01217146A
- Authority
- JP
- Japan
- Prior art keywords
- defrosting
- heat exchanger
- capacity
- indoor
- operated
- 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.)
- Pending
Links
- 238000010257 thawing Methods 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000010438 heat treatment Methods 0.000 abstract description 10
- 238000001816 cooling Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 239000003507 refrigerant Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 210000004907 gland Anatomy 0.000 description 1
Abstract
Description
【発明の詳細な説明】
（イ）産業上の利用分野
本発明は１台の室外ユニットと複数台の室内ユニットと
を接続したヒートポンプ式空気調和機の除霜制御方法に
関する。DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a defrosting control method for a heat pump air conditioner in which one outdoor unit and a plurality of indoor units are connected.
（ロ）従来の技術
ヒートポンプ式空気調和機において、除霜の開始動作線
を圧縮機の能力制御に応動して変化させるようにした除
霜制御方法が特公昭５５−５０２５号公報で提示されて
いる。(B) Conventional technology In a heat pump type air conditioner, a defrosting control method in which the defrosting start operation line is changed in response to compressor capacity control was presented in Japanese Patent Publication No. 55-5025. There is.
（ハ）発明が解決し゛ようとする課題
上記公報で提示の除霜制御方法を１台の室外ユニットと
複数台の室内ユニットとからなる多室型のヒートポンプ
式空気調和機に適用すると次に述べるような不具合さが
生じる。(c) Problems to be Solved by the Invention The following describes how the defrosting control method presented in the above publication is applied to a multi-room heat pump air conditioner consisting of one outdoor unit and multiple indoor units. This kind of problem occurs.
即ち、多室型のヒートポンプ式空気調和機において、複
数台の室内ユニットが同時に暖房運転されている場合で
も各室内の暖房負荷が小さい時は圧縮機が小能力で運転
されており、暖房能力に余裕があるかかる運転時に圧縮
機の小能力運転に応動して高温側の除霜開始界に基づい
て室外熱交換器が除霜開始されるため、逆サイクル（冷
房サイクル）除霜が頻繁にくり返されてしまい、暖まっ
ている室内が逆に冷えてしまう不具合さが生じる。In other words, in a multi-room heat pump air conditioner, even if multiple indoor units are heating at the same time, when the heating load in each room is small, the compressor is operating at a low capacity, and the heating capacity is During such operation when there is sufficient margin, the outdoor heat exchanger starts defrosting based on the defrost start field on the high temperature side in response to the small capacity operation of the compressor, so the reverse cycle (cooling cycle) defrost occurs frequently. This causes a problem where the heated room becomes colder.
しかも、多室型のヒートポンプ式空気調和機では、室内
熱交換器の運転容量が小さいか、又は室内ユニットの運
転台数が少ない場合は室内熱交換器の運転容量が大きい
か、又は室内ユニットの運転台数が多い場合と比較する
と、蒸発圧力（温度）が高いため後者の場合に合わせて
除霜開始動作線を設定すると、除霜開始時における若霜
量が多いと共に逆サイクル除霜時に蒸発器として作用す
る室内熱交換器の容量が小さいために除霜能力が小さく
、従って除霜時間が長くなって霜残りする虞れがあり、
逆に前者の場合に合わせて除霜開始動作線を設定すると
後者の運転ではＭＭ していなくても蒸発温度が下がっ
て除霜開始線に基づいて除霜する、所謂、空除霜運転が
行なわれる虞れがある。Moreover, in multi-room heat pump air conditioners, the operating capacity of the indoor heat exchanger is small, or if the number of indoor units in operation is small, the operating capacity of the indoor heat exchanger is large, or the operating capacity of the indoor unit is Compared to the case where there are many units, the evaporation pressure (temperature) is higher, so if you set the defrost start operation line according to the latter case, the amount of fresh frost at the start of defrosting will be large, and the evaporator will function as an evaporator during reverse cycle defrosting. Since the capacity of the indoor heat exchanger that operates is small, the defrosting capacity is small, so there is a risk that the defrosting time will be longer and frost will remain.
On the other hand, if the defrost start operation line is set according to the former case, in the latter operation, the evaporation temperature will drop even if MM is not performed, and defrost will be performed based on the defrost start line, so-called empty defrost operation. There is a risk that this may occur.
本発明はかかる課題を解決した除霜制御方法を提供する
ことを目的としたものである。An object of the present invention is to provide a defrosting control method that solves these problems.
（ニ）課題を解決するだめの手段
上記目的を達成するために、本発明は除霜の開始動作線
を運転される室内ユニットの熱交換器の容量、又は運転
される室内ユニットの台数に応じて変化きせるようにし
たものである。(d) Means for Solving the Problems In order to achieve the above object, the present invention provides a defrosting start operation line that depends on the capacity of the heat exchanger of the indoor unit being operated or the number of indoor units being operated. It is designed so that it can be changed.
（＊）作用
上記のように除霜の開始動作線を変化させるようにした
ので、運転される室内ユニットの熱交換器の容量が小さ
いか、又は運転される室内ユニットの台数が少ない場合
には外気温度に対して室外熱交換器の設定温度を高くし
た高温側の除霜開始動作線に基づいて除霜運転が開始さ
れるため霜残りすることはない。(*) Effect Since the defrosting start operation line is changed as described above, if the capacity of the heat exchanger of the indoor unit being operated is small or the number of indoor units being operated is small, Since the defrosting operation is started based on the high-temperature side defrosting start operation line in which the set temperature of the outdoor heat exchanger is set higher than the outside air temperature, there is no residual frost.
一方、運転される室内ユニットの熱交換器の容量が大き
いか、又は運転される室内ユニットの台数が多い場合に
は外気温度に対して室外熱交換器の設定温度を低くした
低温側の除霜開始動作線に基づいて除′Ｍ運転が開始さ
れるため空除霜されることはない。On the other hand, if the capacity of the heat exchanger of the indoor unit being operated is large or the number of indoor units being operated is large, defrosting on the low-temperature side is performed by setting the outdoor heat exchanger's set temperature lower than the outside air temperature. Since the defrosting operation is started based on the start operation line, empty defrosting is not performed.
（へ）実施例
本発明の一実施例を第１図乃至第３図に基づいて説明す
ると、第１図において、（１）は圧縮機（２）と四方弁
（３）と室外熱交換器（４）と減圧素子（５）を内蔵し
た１台の室外ユニット、（６ａ） （６ｂ） （６ｃ＞
は室内熱交換器（７ａ） （７ｂ）（７ｃ）と電動式膨
張弁（８ａ）（８ｂ）（８Ｃ）とを内蔵した３台の室内
ユニットで、図示の如く配管接続されている。(f) Example An example of the present invention will be explained based on FIGS. 1 to 3. In FIG. 1, (1) shows a compressor (2), a four-way valve (3), and an outdoor heat exchanger. (4) and one outdoor unit with built-in pressure reducing element (5), (6a) (6b) (6c>
are three indoor units containing indoor heat exchangers (7a), (7b), and (7c) and electric expansion valves (8a), (8b), and (8C), and are connected by piping as shown.
そして、室内熱交換器（７ａ）は３馬力、室内熱交換器
（７ｂ）は２．５馬力、室内熱交換器（７Ｃ）は１．５
馬力の熱交換容量を夫々有しており、これら室内熱交換
器の冷暖房負荷の大きさに応じて圧縮機（２）はインバ
ータ等の能力可変手段で能力が変えられるようになって
いる。The indoor heat exchanger (7a) has 3 horsepower, the indoor heat exchanger (7b) has 2.5 horsepower, and the indoor heat exchanger (7C) has 1.5 horsepower.
Each compressor (2) has a heat exchange capacity of horsepower, and the capacity of the compressor (2) can be changed by a capacity variable means such as an inverter depending on the magnitude of the heating and cooling load of these indoor heat exchangers.
（９）は室内ユニット（６ａ）（６ｂ）（６ｃ）の運転
状態を判別して暖房運転される室内熱交換器＜７ａ）（
７ｂ）（７Ｃ）の合計容量が設定容量５馬力よりも小さ
い時は第３図に示す除霜開始動作！ｌＡを、逆に設定容
量５馬力よりも大きい時は第３図に示す除霜開始動作線
Ｂを選定する選定器、（１０）はセンサー（１１）で検
出した室外熱交換器（４）の温度とセンサー（１２）で
検出した外気温度との差温値をとらえて除霜開始動作ｖ
；ＡＡ 、 Ｂと比較し、四方弁（３）の切換えで逆サ
イクル除霜を行なうか否かを判別する判別器である。(9) is an indoor heat exchanger <7a)(
7b) When the total capacity of (7C) is smaller than the set capacity of 5 horsepower, the defrosting start operation shown in Figure 3 is performed! conversely, when the set capacity is greater than 5 horsepower, the selector selects the defrosting start operation line B shown in Figure 3. (10) is the outdoor heat exchanger (4) detected by the sensor (11). Defrosting starts by capturing the temperature difference between the temperature and the outside temperature detected by the sensor (12).
This is a discriminator that compares with AA and B and determines whether or not to perform reverse cycle defrosting by switching the four-way valve (3).
第２図は除霜制御方法を示すブローチルートで、第１１
３０及び第３図を参照しながら動作を説明する。暖房運
転サイクルは四方弁（３）が実線状態に設定され、圧縮
機（２）−四方弁（３）−室内熱交換器（７ａ）（７ｂ
）（７ｃ）−電動膨張弁（８ａ）（８ｂ）（８ｃ）−減
圧素子（５）−室外熱交換器（４）−四方弁（３）−圧
縮機（２）と順次冷媒が流れることによって形成される
。Figure 2 shows the broach route showing the defrosting control method.
The operation will be explained with reference to 30 and FIG. In the heating operation cycle, the four-way valve (3) is set to the solid line state, and the compressor (2) - four-way valve (3) - indoor heat exchanger (7a) (7b
) (7c) - Electric expansion valve (8a) (8b) (8c) - Pressure reducing element (5) - Outdoor heat exchanger (4) - Four-way valve (3) - Compressor (2) by sequentially flowing the refrigerant. It is formed.
かかる運転サイクルにおいて、電動膨張弁（８ａ）（８
ｂ）（８ｃ）の何れか１個のみが開く単独暖房運転時と
、電動膨張弁（８ａ）（８ｃ）が、又、電動膨張弁（８
ｂ）（８ｃ）が開く同時暖房運転時は運転される室内熱
交換器の合計容量が設定容量５馬力よりも小さいため、
除霜開始°動作線はＡ腺に選定器（９）で選定されてお
り、センサー（１１）（１２）で検出した室外熱交換器
（４）の温度と外気温度との差温値が着霜域を示すａ線
から除霜開始動作線Ａに達すると判別器（１０）から出
力信号が発せられて四方弁（３）が破線状態に切換えら
れ、圧縮機（２）−四方弁（３）−室外熱交換器（４）
−減圧素子（５）−電動膨張弁［（８ａ）（８ｂ）（８
ｃ）の何れか１個か、（８ａ）と（８Ｃ）、又は（８ｂ
）と（８ｃ） ）−室内熱交換器（（７ａ）（７ｂ）（
７ｃ）の何れか１台か、（７ａ）と（７Ｃ）、又は（７
ｂ）と（７ｃ） ）−四方弁（３）−圧縮機（２）と順
次冷媒が循環する逆サイクル（冷房サイクル）による除
ＴＩ運転が開始される。In this operation cycle, the electric expansion valves (8a) (8
b) During independent heating operation when only one of (8c) is opened, electric expansion valve (8a) (8c) is open, and electric expansion valve (8c) is
b) During simultaneous heating operation when (8c) is open, the total capacity of the indoor heat exchangers being operated is smaller than the set capacity of 5 horsepower, so
The defrosting start operation line is selected by the selector (9) in gland A, and the temperature difference between the temperature of the outdoor heat exchanger (4) and the outside air temperature detected by the sensors (11) and (12) is reached. When the defrosting start operation line A is reached from line a indicating the frost area, an output signal is emitted from the discriminator (10) and the four-way valve (3) is switched to the broken line state, and the compressor (2) - four-way valve (3) ) - Outdoor heat exchanger (4)
- Pressure reducing element (5) - Electric expansion valve [(8a) (8b) (8
Any one of c), (8a) and (8C), or (8b
) and (8c) ) - indoor heat exchanger ((7a) (7b) (
7c), (7a) and (7C), or (7
b) and (7c)) - four-way valve (3) - compressor (2), and a reverse cycle (cooling cycle) in which the refrigerant circulates in this order starts the TI removal operation.
一方、電動膨張弁（８ａ）（８ｂ）が、又、電動膨張弁
（８ａ）（８ｂ）（８ｃ）が開く同時暖房運転時におい
ては運転される室内熱交換器の合計容量が設定容量５馬
力よりも大きいため、除霜開始動作線はＢｉに選定器（
９）で選定されており、センサー（１１）（１２）で検
出した室外熱交換器（４）の温度と外気温度との差温値
が着霜域を示すｂ線から除霜開始動作線Ｂに達すると判
別器（１０）から出力信号が発せられて四方弁（３）が
破線状態に切換えられ、圧縮機（２）−四方弁（３）−
室外熱交換器（４）−減圧素子（５）−電動膨張弁（（
８ａ）と（８ｂ）、又は（８ａ）と（８ｂ）と（８ｃ）
）−室内熱交換器（（７ａ）とく７ｂ）、又は（７ａ
）と（７ｂ）と（７ｃ） ）−四方弁（３）−圧縮機（
２）と順次冷媒が循環する逆サイクル（冷房サイクル）
による除霜運転が開始される。On the other hand, during simultaneous heating operation when the electric expansion valves (8a) (8b) and electric expansion valves (8a) (8b) (8c) are opened, the total capacity of the indoor heat exchangers to be operated is set to 5 horsepower. Since it is larger than , the defrosting start operation line is set to Bi by the selector (
9), and the temperature difference value between the temperature of the outdoor heat exchanger (4) detected by the sensor (11) and (12) and the outside air temperature indicates the frost formation area. When it reaches the output signal from the discriminator (10), the four-way valve (3) is switched to the broken line state, and the compressor (2) - four-way valve (3) -
Outdoor heat exchanger (4) - Pressure reducing element (5) - Electric expansion valve ((
8a) and (8b) or (8a) and (8b) and (8c)
) - indoor heat exchanger ((7a) especially 7b), or (7a
) and (7b) and (7c) ) - four-way valve (3) - compressor (
2) and a reverse cycle in which the refrigerant circulates in sequence (cooling cycle)
Defrosting operation starts.
このようにして夫々除重運転が行なわれ、室外熱交換器
（４）の温度が設定温度１０”Ｃよりも高くなるか、又
は、タイマ時間が設定時間１０分に達すると除霜運転が
終了されて四方弁（３）が実線状態に切換わり再び暖房
運転が行なわれる。In this way, each load removal operation is performed, and when the temperature of the outdoor heat exchanger (4) becomes higher than the set temperature of 10"C or the timer time reaches the set time of 10 minutes, the defrosting operation ends. Then, the four-way valve (3) is switched to the solid line state and heating operation is performed again.
このように、運転される室内ユニットの熱交換器の容量
が小さい時は高温側の除霜開始動作線Ａに基づいて除霜
運転が開始されるため室外熱交換器（４）に霜残りする
ことはなく、逆に運転される室内ユニットの熱交換器の
容量が大きい時は低温側の除霜開始動作ｆｉＢに基づい
て除霜運転が開始されるため室外熱交換器（４）が空除
霜されることはない。In this way, when the capacity of the heat exchanger of the operated indoor unit is small, the defrosting operation is started based on the defrosting start operation line A on the high temperature side, so frost remains on the outdoor heat exchanger (4). On the contrary, when the capacity of the heat exchanger of the indoor unit being operated is large, the defrosting operation is started based on the defrosting start operation fiB on the low temperature side, so the outdoor heat exchanger (4) is There will be no frost.
尚、冷房運転サイクルは上述した逆サイクル除霜運転と
同じであるため省略する。Note that the cooling operation cycle is the same as the reverse cycle defrosting operation described above, so a description thereof will be omitted.
第４図及び第５図は本発明の他実施例を示すもので、上
記一実施例と異なるのは２台の室内ユニット（１３ａ）
（１３ｂ）に同一容量の室内熱交換器（１４ａ）（１４
ｂ）が内蔵された点と、室内ユニット（１３ａ）（１３
ｂ）の運転台数が１台の時は第３図に示す除霜開始動作
線Ａを、２台の時は除霜開始動作線Ｂを選定器（９）で
選定した点であり、暖ｙ除霜運転のフローチャートを第
５図に示すことにより動作説明は省略する。4 and 5 show another embodiment of the present invention, which differs from the above embodiment in two indoor units (13a).
(13b) has the same capacity as indoor heat exchanger (14a) (14
b) is built-in, and indoor units (13a) (13
b) When the number of operating units is one, the defrosting start operation line A shown in Fig. 3 is selected, and when the number of operating units is two, the defrosting start operation line B is selected using the selector (9). A flowchart of the defrosting operation is shown in FIG. 5, and the explanation of the operation will be omitted.
（ト）発明の効果
本発明によれば、複数台の室内ユニットを有する多室型
のヒートポンプ式空気調和機において、各室内ユニット
の熱交換器の容量が異なる場合は除霜の開始動作線を運
転される室内ユニットの熱交換器の容量に応じて、又、
各室内ユニットの熱交換器の容量が同一の場合は除霜開
始動作線を運転される室内ユニットの台数に応じて変化
させるようにしたので、熱交換器の容量が小さいか運転
台数が少ない時には室外熱交換器が霜残りすることはな
く除霜され、逆に熱交換器の容量が大きいか運転台数が
多い時には室外熱交換器が空除霜されるのを防止でき、
除Ｍ運転を効率良く行なうことができる。(G) Effects of the Invention According to the present invention, in a multi-room heat pump type air conditioner having a plurality of indoor units, when the capacity of the heat exchanger of each indoor unit is different, the defrosting start operation line is set. Depending on the capacity of the heat exchanger of the indoor unit being operated,
When the heat exchanger capacity of each indoor unit is the same, the defrosting start operation line is changed according to the number of indoor units being operated, so when the heat exchanger capacity is small or the number of operating units is small, The outdoor heat exchanger is defrosted without any residual frost, and conversely, when the capacity of the heat exchanger is large or the number of units in operation is large, the outdoor heat exchanger can be prevented from being defrosted dryly.
M removal operation can be performed efficiently.
第１図乃至第３図は本発明の一実施例を示すもので、第
１図はヒートポンプ式空気調和機の冷媒回路図、第２図
は除霜制御方法を示すフローチャート、第３図は除霜の
開始動作線を示す特性図、第４図及び第５図は本発明の
他実施例を示すもので、第４図はヒートポンプ式空気調
和機の冷媒回路図、第５図は除霜制御方法を示すフロー
チャートである。
（１）・・・室外ユニット、 （２）・・・圧縮機、
（３）・・・四方弁、 （４）−・・室外熱交換器、
（６ａ）（６ｂ）（５ｃ）、 （１３ａ）（１３ｂ）・
−室内ユニット、 （７ａ）（７ｂ）（７ｃ） 。
（１４ａ）（１４ｂ）・・・室内熱交換器。Figures 1 to 3 show one embodiment of the present invention, in which Figure 1 is a refrigerant circuit diagram of a heat pump type air conditioner, Figure 2 is a flowchart showing a defrosting control method, and Figure 3 is a diagram of the defrosting control method. Characteristic diagrams showing the frost start operation line, Fig. 4 and Fig. 5 show other embodiments of the present invention, Fig. 4 is a refrigerant circuit diagram of a heat pump air conditioner, and Fig. 5 is a defrosting control diagram. 3 is a flowchart illustrating the method. (1)...Outdoor unit, (2)...Compressor,
(3)...Four-way valve, (4)--Outdoor heat exchanger,
(6a) (6b) (5c), (13a) (13b)・
- Indoor unit, (7a) (7b) (7c). (14a) (14b)... Indoor heat exchanger.
Claims (2)
の室外ユニットと、室内熱交換器を内蔵した複数台の室
内ユニットとを接続し、四方弁の切換えにより室外熱交
換器を除霜するヒートポンプ式空気調和機において、除
霜の開始動作線を運転される室内ユニットの熱交換器の
容量に応じて変化させることを特徴とする除霜制御方法
。(1) One outdoor unit with a built-in compressor, four-way valve, and outdoor heat exchanger is connected to multiple indoor units with built-in indoor heat exchangers, and the outdoor heat exchanger is connected by switching the four-way valve. A defrosting control method, in a heat pump air conditioner that defrosts an air conditioner, the defrosting start operation line is changed according to the capacity of a heat exchanger of an operated indoor unit.
の室外ユニットと、室内熱交換器を内蔵した複数台の室
内ユニットとを接続し、四方弁の切換えにより室外熱交
換器を除霜するヒートポンプ式空気調和機において、除
霜の開始動作線を運転される室内ユニットの台数に応じ
て変化させることを特徴とする除霜制御方法。(2) Connect one outdoor unit with a built-in compressor, four-way valve, and outdoor heat exchanger to multiple indoor units with built-in indoor heat exchangers, and change the outdoor heat exchanger by switching the four-way valve. A defrosting control method in a heat pump air conditioner that defrosts a room, the defrosting start operation line being changed according to the number of indoor units being operated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63040239A JPH01217146A (en) | 1988-02-23 | 1988-02-23 | Defrosting controlling method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63040239A JPH01217146A (en) | 1988-02-23 | 1988-02-23 | Defrosting controlling method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01217146A true JPH01217146A (en) | 1989-08-30 |
Family
ID=12575164
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63040239A Pending JPH01217146A (en) | 1988-02-23 | 1988-02-23 | Defrosting controlling method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01217146A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5574028B1 (en) * | 2013-07-31 | 2014-08-20 | 株式会社富士通ゼネラル | Air conditioner |
| WO2015004930A1 (en) * | 2013-07-11 | 2015-01-15 | 株式会社 富士通ゼネラル | Air conditioner |
| WO2015019628A1 (en) * | 2013-08-08 | 2015-02-12 | 株式会社 富士通ゼネラル | Air conditioning device |
| JP2015203550A (en) * | 2014-04-16 | 2015-11-16 | 三菱電機株式会社 | air conditioner |
| WO2018189859A1 (en) * | 2017-04-13 | 2018-10-18 | 三菱電機株式会社 | Refrigeration cycle device and defrost operation method for refrigeration cycle device |
| CN110671743A (en) * | 2019-10-24 | 2020-01-10 | 宁波奥克斯电气股份有限公司 | Defrosting control method and device for multi-split air conditioner and multi-split air conditioner |
| WO2020248635A1 (en) * | 2019-06-13 | 2020-12-17 | 青岛海尔空调电子有限公司 | Air conditioner and defrost control method for outdoor unit thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6332269A (en) * | 1986-07-24 | 1988-02-10 | ダイキン工業株式会社 | Heat pump system |
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1988
- 1988-02-23 JP JP63040239A patent/JPH01217146A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6332269A (en) * | 1986-07-24 | 1988-02-10 | ダイキン工業株式会社 | Heat pump system |
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| WO2015004930A1 (en) * | 2013-07-11 | 2015-01-15 | 株式会社 富士通ゼネラル | Air conditioner |
| CN107726537A (en) * | 2013-07-11 | 2018-02-23 | 富士通将军股份有限公司 | Conditioner |
| US10197317B2 (en) | 2013-07-11 | 2019-02-05 | Fujitsu General Limited | Air conditioner with outdoor unit compressor driven at controllable activation rotational speed |
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| JP5574028B1 (en) * | 2013-07-31 | 2014-08-20 | 株式会社富士通ゼネラル | Air conditioner |
| CN105143782A (en) * | 2013-07-31 | 2015-12-09 | 富士通将军股份有限公司 | Air conditioner |
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| WO2018189859A1 (en) * | 2017-04-13 | 2018-10-18 | 三菱電機株式会社 | Refrigeration cycle device and defrost operation method for refrigeration cycle device |
| JPWO2018189859A1 (en) * | 2017-04-13 | 2019-11-14 | 三菱電機株式会社 | Refrigeration cycle apparatus and defrosting operation method for refrigeration cycle apparatus |
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| WO2020248635A1 (en) * | 2019-06-13 | 2020-12-17 | 青岛海尔空调电子有限公司 | Air conditioner and defrost control method for outdoor unit thereof |
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