JPH031584B2 - - Google Patents
Info
- Publication number
- JPH031584B2 JPH031584B2 JP57104424A JP10442482A JPH031584B2 JP H031584 B2 JPH031584 B2 JP H031584B2 JP 57104424 A JP57104424 A JP 57104424A JP 10442482 A JP10442482 A JP 10442482A JP H031584 B2 JPH031584 B2 JP H031584B2
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- defrosting
- temperature difference
- air cooler
- δts
- 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
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
- F25D21/002—Defroster control
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Defrosting Systems (AREA)
Description
【発明の詳細な説明】
この発明は、冷凍装置の空気冷却器に発生する
霜を除霜する除霜制御装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a defrosting control device for defrosting frost generated in an air cooler of a refrigeration system.
第１図は従来の冷凍装置に使用されている一般
的な空気冷却器の概念図であり、図において、１
は空気冷却器を示し、冷却管１１が内臓されてい
る。 Figure 1 is a conceptual diagram of a general air cooler used in conventional refrigeration equipment.
indicates an air cooler, which has a built-in cooling pipe 11.
２は風胴を示し、プロペラ送風機３によつて空気
を空気冷却機１へ導くものである。Reference numeral 2 indicates a wind barrel, which guides air to the air cooler 1 by a propeller blower 3.
１２は冷却管１１入口側の管壁に熱伝的に取り付
けられた第１の測温体、１３は空気冷却器１へ流
入する空気温度を計測する第２の測温体を示す。Reference numeral 12 denotes a first temperature measuring element thermally attached to the tube wall on the inlet side of the cooling pipe 11, and 13 denotes a second temperature measuring element for measuring the temperature of the air flowing into the air cooler 1.
第２図は空気冷却器１の着霜量(F)と第１，第２
の測温体１２，１３の温度差(ΔT)との関係を示
す代表的な特性曲線図である。 Figure 2 shows the amount of frost (F) on air cooler 1 and the
FIG. 2 is a typical characteristic curve diagram showing the relationship between the temperature difference (ΔT) between the thermometers 12 and 13;
第３図は第１図に示されている空気冷却器１に
発生する霜を除霜する従来の除霜制御装置を示す
ブロツク図であり、図において、５は演算器、６
は除霜開始指令用の温度差（ΔT）を設定する温
度差設定器、８は除霜熱源機器を示す。 FIG. 3 is a block diagram showing a conventional defrosting control device for defrosting the frost generated in the air cooler 1 shown in FIG.
8 indicates a temperature difference setting device for setting a temperature difference (ΔT) for a defrosting start command, and 8 indicates a defrosting heat source device.
次に、動作について説明する。 Next, the operation will be explained.
冷凍運転を続けると、空気冷却器１に霜が付着
するが、この着霜量(F)を直接的に検出するのは技
術的、コスト的に難問があるため、一般的には第
２図に示される着霜量(F)と温度差（ΔT）の特性
曲線から温度差（ΔT1）に上昇したときの着霜量
（F1）で除霜を開始し、一定時間空気冷却器(1)を
加熱することによつて除霜を行う。すなわち、第
３図において、まず、温度差設定器(6)で除霜開始
指令用の温度差（ΔT）を（ΔT1）に設定し、第
１、第２の測温体１２，１３が検知した刻々の温
度差（ΔTs）（図示なし）を演算器５で比較し、
ΔTs≧ΔT1のときに除霜熱源機器８に除霜開始の
信号を出力するとともに、演算器５に内蔵されて
いるタイマー（図示なし）で除霜開始後にタイム
カウントを行い、一定時間が経過すると、除霜熱
源機器８を停止させる信号を出力する除霜制御を
行う。 If refrigeration operation continues, frost will adhere to the air cooler 1, but since it is difficult to directly detect the amount of frost (F) in terms of technology and cost, generally the method shown in Figure 2 is used. Defrosting is started at the frost amount (F 1 ) when the temperature rises to the temperature difference (ΔT 1 ) from the characteristic curve of frost amount (F) and temperature difference (ΔT) shown in , and the air cooler ( Defrosting is performed by heating 1). That is, in FIG. 3, first, the temperature difference (ΔT) for the defrosting start command is set to (ΔT 1 ) using the temperature difference setting device (6), and the first and second temperature measuring elements 12 and 13 are set to (ΔT 1 ). The detected momentary temperature difference (ΔTs) (not shown) is compared with the calculator 5,
When ΔTs≧ΔT 1 , a signal to start defrosting is output to the defrosting heat source device 8, and a timer (not shown) built in the calculator 5 counts the time after the defrosting starts, and a certain period of time elapses. Then, defrosting control is performed to output a signal to stop the defrosting heat source device 8.
従来の除霜制御装置は以上のように構成されて
いるので、次の欠点があつた。 Since the conventional defrosting control device is configured as described above, it has the following drawbacks.
(イ) 除霜開始指令用の温度差（ΔT1）はオペレー
タが最適値を予測して設定するので、温度差
（ΔT1）が大きすぎると一定時間内に霜を融か
すことができなくなる。(b) The temperature difference (ΔT 1 ) for the defrosting start command is set by the operator by predicting the optimal value, so if the temperature difference (ΔT 1 ) is too large, it will not be possible to melt the frost within a certain amount of time. .
(ロ) 温度（ΔT1）差が小さ過ぎれば余分な加熱を
行う損失があるとともに、除霜も頻繁となり、
動力浪費が多くなる。(b) If the temperature (ΔT 1 ) difference is too small, there will be loss due to extra heating, and defrosting will be required more frequently.
More power is wasted.
(ハ) 最適設定値を見つけ出すのに労力、手間がか
かる。(c) It takes effort and effort to find the optimal setting values.
この発明は上記のような問題点を解消するため
になされたもので、除霜完了を指令するタイマー
の他に除霜完了を検出する温度検出器を使用し、
タイマーの指令と温度検出器の除霜完了指示の順
序を温度差設定器にフィードバツクすることによ
つて動力浪費が少なく、信頼制の高い除霜制御装
置を得ることを目的とする。 This invention was made to solve the above problems, and uses a temperature detector to detect the completion of defrosting in addition to a timer that commands the completion of defrosting.
The purpose of the present invention is to provide a highly reliable defrosting control device with less power wastage by feeding back the order of a timer command and a defrosting completion command from a temperature sensor to a temperature difference setting device.
以下、この発明の一実施例を図について説明す
る。 An embodiment of the present invention will be described below with reference to the drawings.
第４図において、第３図と同一部分には同一符
号が付してあり、１４は空気冷却器１の温度を検
出する温度差抵抗体からなる温度検出器を示し、
空気冷却器１の所定位置に取り付けられる。例え
ば、除霜熱源機器８がホツトガスデフロスト装置
の場合は、第５図に示すように、冷却管１１の出
口側の管壁に熱伝的に取り付ける。１０は演算器
を示す。 In FIG. 4, parts that are the same as those in FIG.
It is attached to a predetermined position of the air cooler 1. For example, if the defrosting heat source device 8 is a hot gas defrost device, it is thermally attached to the tube wall on the outlet side of the cooling tube 11, as shown in FIG. 10 indicates a computing unit.
次に、動作について説明する。 Next, the operation will be explained.
従来と同様に冷凍運転を行い、この運転によつ
て時々刻々変化する温度差（ΔTs）は第１、第
２の測温体１２，１３で検出される。この温度差
（ΔTs）は演算器１０で温度差（ΔT1）と比較演
算され、（ΔTs）≧（ΔT1）のときに演算器１０か
ら除霜熱源機器８へ除霜指令を出力して空気冷却
器１の冷凍運転を停止させるとともに、除霜熱源
機器８によつて加熱を行う。 Refrigeration operation is performed as in the conventional case, and the temperature difference (ΔTs) that changes from moment to moment due to this operation is detected by the first and second temperature measuring elements 12 and 13. This temperature difference (ΔTs) is compared with the temperature difference (ΔT 1 ) in the computing unit 10, and when (ΔTs)≧(ΔT 1 ), the computing unit 10 outputs a defrosting command to the defrosting heat source device 8. The refrigeration operation of the air cooler 1 is stopped, and the defrosting heat source device 8 performs heating.
加熱開始後は演算１０内のタイマーがタイムカ
ウントを開始するとともに、温度検出器１４から
の入力を温度変換し、初期的に記憶している除霜
完了温度と比較演算することによつて初期記憶基
準温度（T1）と検出温度（Ts）とがTs≧T1の関
係を満足すると、演算器１０は除霜終了指令を出
力し、除霜熱源機器８を停止させる。 After heating starts, the timer in the calculation 10 starts time counting, and the input from the temperature detector 14 is converted into temperature and compared with the initially stored defrosting completion temperature. When the reference temperature (T 1 ) and the detected temperature (Ts) satisfy the relationship Ts≧T 1 , the computing unit 10 outputs a defrosting end command and stops the defrosting heat source device 8 .
また、Ts≧T1の関係を満たす前にタイマーが
タイムアツプしても同様に除霜熱源機器８を停止
させるが、この場合は演算器１０が温度差
（ΔT1）を、例えば1deg.C自動的に減少させ、次
の除霜のときはこの減少した温度差（ΔT1′）と
測定した温度差（ΔTs）の関係がTs≧T1′を満た
すときに除霜を開始し、タイマーのタイムアツプ
よりも先にTs≧T1′の関係が満足するように補正
する。 Furthermore, even if the timer times up before the relationship Ts≧T 1 is satisfied, the defrosting heat source device 8 is similarly stopped. During the next defrosting, defrosting is started when the relationship between this decreased temperature difference (ΔT 1 ′) and the measured temperature difference (ΔTs) satisfies Ts ≥ T 1 ′, and the timer is set. Correction is made so that the relationship Ts≧T 1 ′ is satisfied before time-up.
そして、演算器１０内のタイマーの設定値は除
霜時間が長すぎると、冷却停止時間が長くなつて
一時的に負荷温度（例えば冷蔵庫の庫内温度）上
昇という不具合が起こるので、一般的には30分〜
40分に限定されている。 If the defrosting time is too long, the setting value of the timer in the computing unit 10 is generally determined because if the defrosting time is too long, the cooling stop time will become longer and the load temperature (for example, the temperature inside the refrigerator) will temporarily rise. 30 minutes~
Limited to 40 minutes.
なお、上記実施例では温度差（ΔT1）を減少さ
せる設定値を1deg.Cとしたが、これに拘束され
るものではなく、例えば0.5deg.Cあるいは2deg.C
以上であつてもよい。 In addition, in the above embodiment, the setting value for reducing the temperature difference (ΔT 1 ) was set to 1deg.C, but it is not limited to this; for example, it may be set to 0.5deg.C or 2deg.C.
The above may be the case.
また、除霜終了時間の最低タイマーを設け、例
えば25分以下で除霜が完了する場合は逆に温度差
（ΔT1）を1deg.C増加させるようにしてもよい。 Further, a minimum timer for the defrosting end time may be provided, and if defrosting is completed in 25 minutes or less, for example, the temperature difference (ΔT 1 ) may be increased by 1 deg.C.
以上のように、この発明によればタイマーと温
度検出器との除霜完了指示の前後を判別して除霜
開始用の温度差（ΔT1）の初期設定を自動的に増
減するように構成したので、除霜不完全現象や除
霜回数過多をなくすように除霜開始の温度差
（ΔT1）が設定でき、信頼制の高い除霜制御装置
が得られる効果がある。 As described above, according to the present invention, the timer and the temperature detector are configured to automatically increase or decrease the initial setting of the temperature difference (ΔT 1 ) for starting defrosting by determining before and after the defrosting completion instruction is issued. Therefore, the temperature difference (ΔT 1 ) at the start of defrosting can be set so as to eliminate incomplete defrosting and excessive defrosting, and a highly reliable defrosting control device can be obtained.
第１図は従来の一般的な空気冷却器の概念図、
第２図は一般的な空気冷却器の着霜量と温度差と
の関係を示す着霜特性図、第３図は従来の除霜制
御装置を示すブロツク図、第４図はこの発明の一
実施例による除霜制御装置を示すブロツク図、第
５図はこの発明に必要な温度検出器の取り付け位
置の一例を示す空気冷却器の概念図である。
図中、１は空気冷却器、６は温度差設定器、１
０は演算器、１２，１３は第１、第２の測温体、
１４は温度検出器を示す。なお、図中、同一符号
は同一、または相当部分を示す。
Figure 1 is a conceptual diagram of a conventional general air cooler.
Fig. 2 is a frost formation characteristic diagram showing the relationship between the amount of frost formation and temperature difference in a general air cooler, Fig. 3 is a block diagram showing a conventional defrosting control device, and Fig. 4 is a diagram showing the relationship between the amount of frost formation and temperature difference in a general air cooler. FIG. 5 is a block diagram showing a defrosting control device according to an embodiment. FIG. 5 is a conceptual diagram of an air cooler showing an example of the mounting position of a temperature sensor necessary for the present invention. In the figure, 1 is an air cooler, 6 is a temperature difference setting device, 1
0 is a computing unit, 12 and 13 are first and second temperature measuring bodies,
14 indicates a temperature sensor. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.
Claims (1)
気冷却器の冷却管の入口温度、流入空気の温度を
検出する第１、第２の測温体と、除霜指令用の温
度差（ΔT1）を設定する温度差設定器と、前記冷
却管の出口温度を検出する温度検出器と、前記第
１、第２の測温体で検出した温度の温度差
（ΔTs）と前記温度差（ΔT1）とを比較演算し、
ΔTs≧ΔT1を満足するときは除霜指令を出力する
とともに、その時点から設定時間のタイムカウン
トを行い、前記温度検出器の検出温度（Ts）が
初期記憶基準温度（T1）以上となる時期よりも
早く設定時間がタイムアツプするときは温度差
（ΔT1）を所定値減少させた値に、前記検出温度
（Ts）が前記初期記憶基準温度（T1）以上となる
時期よりも遅く前記設定時間がタイムアツプする
ときは温度差（ΔT1）を所定値増加させた値に再
設定することができる演算器とを備えた除霜制御
装置。1. First and second temperature measuring bodies that detect the inlet temperature of the cooling pipe of the air cooler and the temperature of the incoming air, which change depending on the amount of frost on the air cooler, and a temperature difference for defrosting command ( a temperature difference setting device for setting ΔT 1 ), a temperature detector for detecting the outlet temperature of the cooling pipe, and a temperature difference (ΔTs) between the temperatures detected by the first and second temperature measuring elements and the temperature difference. (ΔT 1 ),
When ΔTs≧ΔT 1 is satisfied, a defrost command is output, and a set time is counted from that point, and the detected temperature (Ts) of the temperature detector becomes equal to or higher than the initial memory reference temperature (T 1 ). When the set time expires earlier than the time, the temperature difference (ΔT 1 ) is reduced by a predetermined value, and the value is set later than the time when the detected temperature (Ts) becomes equal to or higher than the initial memory reference temperature (T 1 ). A defrosting control device comprising: a calculator capable of resetting a temperature difference (ΔT 1 ) to a value increased by a predetermined value when a set time expires.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57104424A JPS58219345A (en) | 1982-06-15 | 1982-06-15 | Defrosting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57104424A JPS58219345A (en) | 1982-06-15 | 1982-06-15 | Defrosting device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58219345A JPS58219345A (en) | 1983-12-20 |
| JPH031584B2 true JPH031584B2 (en) | 1991-01-10 |
Family
ID=14380305
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57104424A Granted JPS58219345A (en) | 1982-06-15 | 1982-06-15 | Defrosting device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58219345A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4563877A (en) * | 1984-06-12 | 1986-01-14 | Borg-Warner Corporation | Control system and method for defrosting the outdoor coil of a heat pump |
| US4749881A (en) * | 1987-05-21 | 1988-06-07 | Honeywell Inc. | Method and apparatus for randomly delaying a restart of electrical equipment |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5217258B2 (en) * | 1974-05-21 | 1977-05-14 | ||
| JPS5661530A (en) * | 1979-10-26 | 1981-05-27 | Hitachi Ltd | Defrosting device of air conditioner |
-
1982
- 1982-06-15 JP JP57104424A patent/JPS58219345A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58219345A (en) | 1983-12-20 |
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