JPH0245777B2 - - Google Patents
Info
- Publication number
- JPH0245777B2 JPH0245777B2 JP58147358A JP14735883A JPH0245777B2 JP H0245777 B2 JPH0245777 B2 JP H0245777B2 JP 58147358 A JP58147358 A JP 58147358A JP 14735883 A JP14735883 A JP 14735883A JP H0245777 B2 JPH0245777 B2 JP H0245777B2
- Authority
- JP
- Japan
- Prior art keywords
- temperature difference
- fluid temperature
- temperature
- heat exchanger
- defrosting operation
- 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 - Lifetime
Links
- 239000012530 fluid Substances 0.000 claims description 39
- 238000010257 thawing Methods 0.000 claims description 27
- 238000010438 heat treatment Methods 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 6
- 238000009825 accumulation Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 238000001816 cooling Methods 0.000 description 5
- 230000007423 decrease Effects 0.000 description 4
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000006386 memory function Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
Description
【発明の詳細な説明】
本発明はヒートポンプの除霜運転切換え方法に
関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for switching defrosting operation of a heat pump.
一般に、ヒートポンプは周知のように暖房運転
時に室外側熱交換器への蓄霜が進行すると、暖房
能力が低下して効率の良い暖房運転が阻害され
る。そこで、暖房能力の低下を防止するために一
時的に暖房運転から冷房運転へ切換えて室外側熱
交換器に蓄霜した霜を除去する除霜運転を従来よ
り行つている。従来のこの種の除霜運転の切換え
は例えば特公昭48−20825号に記載されているよ
うに、室内側熱交換器の入口流体温度と出口流体
温度との温度差を測定して暖房運転開始の立上が
りから除霜運転を行うまでの１サイクル中の最大
温度差を記憶し、室外側熱交換器への蓄霜により
室内側熱交換器の入口流体温度と出口流体温度と
の温度差が減少していく過程でその時の温度差が
記憶された最大温度差に対してある設定値まで低
下したとき除霜運転（冷房運転）に切換えるよう
にしている。 Generally, as is well known, when a heat pump accumulates frost on an outdoor heat exchanger during heating operation, the heating capacity decreases and efficient heating operation is inhibited. Therefore, in order to prevent the heating capacity from decreasing, a defrosting operation has been conventionally performed in which the heating operation is temporarily switched to the cooling operation to remove the frost accumulated in the outdoor heat exchanger. Conventionally, this type of defrosting operation switching is described in Japanese Patent Publication No. 48-20825, in which heating operation is started by measuring the temperature difference between the inlet fluid temperature and outlet fluid temperature of the indoor heat exchanger. Stores the maximum temperature difference during one cycle from the start of operation to defrosting operation, and the temperature difference between the inlet fluid temperature and outlet fluid temperature of the indoor heat exchanger decreases due to frost accumulation in the outdoor heat exchanger. During this process, when the temperature difference at that time drops to a certain set value with respect to the stored maximum temperature difference, the defrosting operation (cooling operation) is switched to.
ところが、このような従来の切換え方法は第１
図に示すように定常状態（室内側熱交換器の入口
流体温度が一定）のときはさほど問題はないが、
第２図に示すように早期の起動時の如き立上がり
時には室内側熱交換器の入口流体温度T1が時間
経過と共に上昇するため除霜運転の開始時期が早
過ぎる傾向にある。その結果、被空調室の室温の
立上がり性能が悪くなつたり、壁面等より放射冷
却を受けてドラフトを感じるなどの悪影響を及ぼ
していた。 However, this conventional switching method
As shown in the figure, there is not much of a problem in steady state (indoor heat exchanger inlet fluid temperature is constant).
As shown in FIG. 2, at the time of early start-up, the inlet fluid temperature T1 of the indoor heat exchanger increases over time, so the defrosting operation tends to start too early. As a result, the room temperature in the air-conditioned room deteriorates in its rising performance, and the air conditioner receives radiation cooling from the walls, resulting in a feeling of draft.
本発明は上記の問題を解決するためになされた
ものであり、その目的は室外側熱交換器への蓄霜
が適度に進んだ時点で除霜運転に切換えられるヒ
ートポンプの除霜運転切換え方法を提供すること
にある。 The present invention has been made to solve the above problems, and its purpose is to provide a method for switching the defrosting operation of a heat pump, which switches to the defrosting operation when the frost accumulation on the outdoor heat exchanger has progressed to a suitable level. It is about providing.
本発明は上記の目的を達成するために、室内側
熱交換器の入口流体温度および出口流体温度との
温度差を測定して暖房運転開始から除霜運転開始
までの１サイクル中における最大温度差を記憶す
ると共に、この記憶した最大温度差の時の上記入
口流体温度を記憶し、この記憶した入口流体温度
と時間的に変化する上記出口流体温度との温度差
が記憶した前記最大温度差の所定パーセント以下
になつたときに除霜運転に切換えるようにしたこ
とを特徴としている。 In order to achieve the above object, the present invention measures the temperature difference between the inlet fluid temperature and the outlet fluid temperature of the indoor heat exchanger, and measures the maximum temperature difference during one cycle from the start of heating operation to the start of defrosting operation. is stored, and the inlet fluid temperature at the time of the stored maximum temperature difference is stored, and the temperature difference between the stored inlet fluid temperature and the temporally varying exit fluid temperature is equal to the stored maximum temperature difference. It is characterized by switching to defrosting operation when the temperature drops below a predetermined percentage.
以下、図面を参照して本発明の実施例を説明す
る。 Embodiments of the present invention will be described below with reference to the drawings.
第３図は本発明を適用したヒートポンプの概略
構成図で、図中符号１は圧縮機、２は四方切換え
弁、３は室外側熱交換器、４は室内側熱交換器、
５，６は逆止弁、７，８はキヤピラリチユーブで
ある。また、符号９，１０は室内側熱交換器４の
入口流体温度T1および出口流体温度T2をそれぞ
れ測定する温度センサである。この温度センサ
９，１０は測定した室内側熱交換器４の入口流体
温度T1および出口流体温度T2を記憶機能を備え
た制御装置１１に供給している。制御装置１１は
温度センサ９，１０からの室内側熱交換器４の入
口流体温度T1および出口流体温度T2との温度差
を検出して暖房運転開始から除霜運転開始までの
１サイクル中における最大温度差ΔTmaxを記憶
すると共に記憶された最大温度差T3のときの室
内側熱交換器４の入口流体温度T1を記憶する。
そして、この制御装置１１は記憶した入口流体温
度T1と温度センサ１０から供給される時間的に
変化する室内側熱交換器３の出口流体温度T2と
の温度差を検出して上記温度差が記憶した最大温
度差ΔTmaxのＫ％以下になつたときに四方切換
え弁２に切換え信号を送出してヒートポンプを暖
房運転から除霜運転（冷房運転）に所定時間切換
えるものである。なお、Ｋはフロスト判別係数で
任意に設定可能である。また、図中実線矢印は暖
房運転時の熱媒の流れを示し、破線矢印は冷房運
転時の冷媒の流れを示している。 FIG. 3 is a schematic configuration diagram of a heat pump to which the present invention is applied, in which reference numeral 1 is a compressor, 2 is a four-way switching valve, 3 is an outdoor heat exchanger, 4 is an indoor heat exchanger,
5 and 6 are check valves, and 7 and 8 are capillary tubes. Further, reference numerals 9 and 10 are temperature sensors that respectively measure the inlet fluid temperature T1 and the outlet fluid temperature T2 of the indoor heat exchanger 4. The temperature sensors 9 and 10 supply the measured inlet fluid temperature T1 and outlet fluid temperature T2 of the indoor heat exchanger 4 to a control device 11 having a memory function. The control device 11 detects the temperature difference between the inlet fluid temperature T1 and the outlet fluid temperature T2 of the indoor heat exchanger 4 from the temperature sensors 9 and 10, and determines the maximum temperature during one cycle from the start of heating operation to the start of defrosting operation. The temperature difference ΔTmax is stored, and the inlet fluid temperature T1 of the indoor heat exchanger 4 at the stored maximum temperature difference T3 is stored.
Then, this control device 11 detects the temperature difference between the stored inlet fluid temperature T1 and the temporally changing outlet fluid temperature T2 of the indoor heat exchanger 3 supplied from the temperature sensor 10, and stores the temperature difference. When the maximum temperature difference ΔTmax falls below K%, a switching signal is sent to the four-way switching valve 2 to switch the heat pump from heating operation to defrosting operation (cooling operation) for a predetermined period of time. Note that K is a frost discrimination coefficient and can be arbitrarily set. Further, solid line arrows in the figure indicate the flow of heat medium during heating operation, and broken line arrows indicate the flow of refrigerant during cooling operation.
次に第４図を参照して本実施例の作用について
説明する。同図に示すように暖房運転が開始され
ると、立上がり時は室内側熱交換器４の出口流体
温度T2が急上昇し、入口流体温度T1との間に最
大温度差ΔTmaxが生じる。制御装置１１は暖房
運転開始から除霜運転開始までの１サイクル中に
おけるその最大温度差ΔTmaxを記憶すると共に
その時の入口流体温度T1′を記憶する。暖房運転
が継続すると、室内側熱交換器４の入口流体温度
T1が徐々に上昇し、出口流体温度T2は室外側熱
交換器３への蓄霜により下降する。制御装置１１
は室内側熱交換器３への蓄霜状態を適確に判断す
るために記憶した入口流体温度T1′と温度センサ
１０からの時間的に変化する出口流体温度T2と
の温度差ΔTを検出する。ここで、検出した温度
差ΔTが記憶した最大温度差ΔTmaxのＫ％なら
ば暖房運転を継続し、Ｋ％以下ならば除霜運転に
切換える。そして、除霜運転を所定時間行つたの
ち、再び暖房運転に切換えて上述した動作を繰返
す。 Next, the operation of this embodiment will be explained with reference to FIG. As shown in the figure, when the heating operation is started, the outlet fluid temperature T2 of the indoor heat exchanger 4 rises rapidly, and a maximum temperature difference ΔTmax occurs between it and the inlet fluid temperature T1. The control device 11 stores the maximum temperature difference ΔTmax during one cycle from the start of heating operation to the start of defrosting operation, and also stores the inlet fluid temperature T1' at that time. When the heating operation continues, the inlet fluid temperature of the indoor heat exchanger 4 decreases.
T1 gradually increases, and outlet fluid temperature T2 decreases due to frost accumulation in the outdoor heat exchanger 3. Control device 11
detects the temperature difference ΔT between the stored inlet fluid temperature T1' and the temporally changing outlet fluid temperature T2 from the temperature sensor 10 in order to accurately judge the frost accumulation state in the indoor heat exchanger 3. . Here, if the detected temperature difference ΔT is K% of the stored maximum temperature difference ΔTmax, heating operation is continued, and if it is below K%, switching to defrosting operation is performed. Then, after performing the defrosting operation for a predetermined period of time, the operation is switched to the heating operation again and the above-described operation is repeated.
このように本実施例においては、室外側熱交換
器３への蓄霜状態を記憶した入口流体温度T1′と
温度センサ１０から時間的に変化する出口流体温
度T2との温度差ΔTにより判定しているので、暖
房運転開始の立上り時における除霜運転の切換え
が従来より遅くなり、被空調室の室温の立上り性
能等が向上する。 As described above, in this embodiment, the frost accumulation state in the outdoor heat exchanger 3 is determined based on the temperature difference ΔT between the stored inlet fluid temperature T1' and the outlet fluid temperature T2 which changes over time from the temperature sensor 10. Therefore, the switching of the defrosting operation at the start of the heating operation is slower than before, and the performance of starting up the room temperature of the air-conditioned room is improved.
以上述べたように本発明によれば、室内側熱交
換器の入口流体温度および出口流体温度との温度
差を測定して暖房運転開始から除霜運転開始まで
の１サイクル中における最大温度差を記憶すると
共に、この記憶した最大温度差の時の上記入口流
体温度を記憶し、この記憶した入口流体温度と時
間的に変化する上記出口流体温度との温度差が記
憶した前記最大温度差の所定パーセント以下にな
つたときに除霜運転に切換えるようにしたので、
室外側熱交換器への蓄霜が適度に進んだ時点で除
霜運転に切換えられるヒートポンプの除霜運転切
換え方法を提供できる。 As described above, according to the present invention, the temperature difference between the inlet fluid temperature and the outlet fluid temperature of the indoor heat exchanger is measured, and the maximum temperature difference during one cycle from the start of heating operation to the start of defrosting operation is calculated. The inlet fluid temperature at the time of the stored maximum temperature difference is stored, and the temperature difference between the stored inlet fluid temperature and the temporally varying exit fluid temperature is a predetermined value of the stored maximum temperature difference. Since the system switches to defrost operation when the temperature drops below 30%,
It is possible to provide a method for switching the defrosting operation of a heat pump, which switches to the defrosting operation when the frost accumulation on the outdoor heat exchanger has progressed appropriately.
第１図は定常状態における従来の除霜運転開始
時期を示す図、第２図は暖房運転開始の立上り時
における従来の除霜運転開始時期を示す図、第３
図は本発明を適用したヒートポンプの概略構成
図、第４図は本発明による除霜運転開始時期を示
す図である。
１……圧縮機、２……四方切換え弁、３……室
外側熱交換器、４……室内側熱交換器、５，６…
…逆止弁、７，８……キヤピラリチユーブ、９，
１０……温度センサ、１１……制御装置。
Figure 1 is a diagram showing the conventional defrosting operation start timing in a steady state, Figure 2 is a diagram showing the conventional defrosting operation start timing at the start of heating operation, and Figure 3 is a diagram showing the conventional defrosting operation start timing at the start of heating operation.
The figure is a schematic configuration diagram of a heat pump to which the present invention is applied, and FIG. 4 is a diagram showing the start timing of defrosting operation according to the present invention. 1... Compressor, 2... Four-way switching valve, 3... Outdoor heat exchanger, 4... Indoor heat exchanger, 5, 6...
...Check valve, 7, 8...Capillary tube, 9,
10... Temperature sensor, 11... Control device.
Claims (1)
度および出口流体温度との温度差を測定して暖房
運転開始から除霜運転開始までの１サイクル中に
おける最大温度差を記憶すると共に、この記憶し
た最大温度差の時の上記入口流体温度を記憶し、
この記憶した入口流体温度と時間的に変化する上
記出口流体温度との温度差が記憶した前記最大温
度差の所定パーセント以下になつたときに除霜運
転に切換えることを特徴とするヒートポンプの除
霜運転切換え方法。1 Measure the temperature difference between the inlet fluid temperature and outlet fluid temperature of the indoor heat exchanger of the heat pump, and store the maximum temperature difference during one cycle from the start of heating operation to the start of defrosting operation, and store the maximum temperature difference during one cycle from the start of heating operation to the start of defrosting operation. Memorize the above inlet fluid temperature at the time of temperature difference,
Defrosting of a heat pump characterized in that the defrosting operation is switched to when the temperature difference between the stored inlet fluid temperature and the temporally changing outlet fluid temperature becomes less than or equal to a predetermined percentage of the stored maximum temperature difference. Operation switching method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58147358A JPS6038544A (en) | 1983-08-12 | 1983-08-12 | Changine-over method of heat pump to/from defrosting operation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58147358A JPS6038544A (en) | 1983-08-12 | 1983-08-12 | Changine-over method of heat pump to/from defrosting operation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6038544A JPS6038544A (en) | 1985-02-28 |
| JPH0245777B2 true JPH0245777B2 (en) | 1990-10-11 |
Family
ID=15428387
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58147358A Granted JPS6038544A (en) | 1983-08-12 | 1983-08-12 | Changine-over method of heat pump to/from defrosting operation |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6038544A (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62173337A (en) * | 1986-01-28 | 1987-07-30 | Toyota Motor Corp | Integral control device of automatic transmission and engine |
| JPS63147946A (en) * | 1986-12-10 | 1988-06-20 | Mazda Motor Corp | Idle speed control device for engine |
| JPH0452441A (en) * | 1990-06-18 | 1992-02-20 | Sanyo Electric Co Ltd | Frost-detecting method for heat pump type air-conditioner |
| US5379608A (en) * | 1992-03-24 | 1995-01-10 | Fuji Electric Co., Ltd. | Defrosting control unit for showcases |
| US5727395A (en) * | 1997-02-14 | 1998-03-17 | Carrier Corporation | Defrost control for heat pump |
| US5797273A (en) * | 1997-02-14 | 1998-08-25 | Carrier Corporation | Control of defrost in heat pump |
| CN110736215B (en) * | 2019-09-27 | 2022-04-15 | 青岛海尔空调器有限总公司 | Control method and control device for defrosting of air conditioner and air conditioner |
-
1983
- 1983-08-12 JP JP58147358A patent/JPS6038544A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6038544A (en) | 1985-02-28 |
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