JPH0381060B2 - - Google Patents
Info
- Publication number
- JPH0381060B2 JPH0381060B2 JP57051008A JP5100882A JPH0381060B2 JP H0381060 B2 JPH0381060 B2 JP H0381060B2 JP 57051008 A JP57051008 A JP 57051008A JP 5100882 A JP5100882 A JP 5100882A JP H0381060 B2 JPH0381060 B2 JP H0381060B2
- Authority
- JP
- Japan
- Prior art keywords
- temperature difference
- circuit
- heat exchanger
- air
- correction
- 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
- 238000010257 thawing Methods 0.000 claims description 22
- 230000007423 decrease Effects 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 9
- 238000009825 accumulation Methods 0.000 claims description 7
- 230000003247 decreasing effect Effects 0.000 claims description 2
- 239000012530 fluid Substances 0.000 claims 3
- 238000010438 heat treatment Methods 0.000 description 24
- 239000003507 refrigerant Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 5
- 238000007664 blowing Methods 0.000 description 4
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 239000003415 peat Substances 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Landscapes
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
Description
【発明の詳細な説明】
本発明は、空気熱源ピートポンプ、エアコン、
チラー、冷凍装置などに応用できる除霜方法に関
する。DETAILED DESCRIPTION OF THE INVENTION The present invention provides an air heat source peat pump, an air conditioner,
This article relates to a defrosting method that can be applied to chillers, refrigeration equipment, etc.
従来の除霜方法として、特開昭48−20825号公
報に示された方法がある。この除霜方法を第１図
を参照して説明する。利用側熱交換器（室内熱交
換器）の入口空気温度と出口空気温度との温度差
を検知し、デアイスを行なわせるまでの１サイク
ルのうち最大温度差Ｂを記憶し、熱源側熱交換器
（室外熱交換器）への霜の蓄積により上記温度差
が減少していく経過で、その時点での温度差が記
憶してある無霜の最大温度差Ｂに対して設定され
た値Ａまで低下した時デアイスを開始するように
している。一方、暖房能力は、利用側熱交換器を
通過する風量と、当該熱交換機の入口空気温度と
出口空気温度との温度差および空気の比熱の積で
表わされる。したがつて、従来方式では、利用側
熱交換器の暖房能力が不変であつてもフアンの切
換による風量の変化、補助ヒータのON−OFF、
圧縮機の容量制御等の熱源側交換器への霜の蓄積
以外の外乱によつて、入口空気温度と出口空気温
度との温度差が変動するので、的確に熱源側熱交
換器の霜の蓄積に基く利用側熱交換器の暖房能力
の低下を検知できないという不具合があつた。 As a conventional defrosting method, there is a method disclosed in Japanese Unexamined Patent Publication No. 48-20825. This defrosting method will be explained with reference to FIG. Detects the temperature difference between the inlet air temperature and outlet air temperature of the user side heat exchanger (indoor heat exchanger), stores the maximum temperature difference B in one cycle until de-ice is performed, and As the temperature difference described above decreases due to the accumulation of frost on the (outdoor heat exchanger), the temperature difference at that point reaches the value A set for the stored maximum temperature difference B without frost. I am trying to start de-ice when it drops. On the other hand, the heating capacity is expressed as the product of the amount of air passing through the user-side heat exchanger, the temperature difference between the inlet air temperature and the outlet air temperature of the heat exchanger, and the specific heat of the air. Therefore, in the conventional method, even if the heating capacity of the heat exchanger on the user side remains unchanged, the air volume changes due to fan switching, the auxiliary heater turns on and off,
The temperature difference between the inlet air temperature and the outlet air temperature fluctuates due to disturbances other than frost accumulation on the heat source side heat exchanger, such as compressor capacity control, so it is possible to accurately prevent frost accumulation on the heat source side heat exchanger. There was a problem that it was not possible to detect a decrease in the heating capacity of the heat exchanger on the user side based on the system.
本発明は上記事情にかんがみてなされたもの
で、たとえば利用側（室内側）のフアの風量切換
に伴う風量の変化に基く利用側熱交換器の入口お
よび出口の空気温度の温度差の変動を自動補正
し、熱源側熱交換器の霜の蓄積による暖房能力の
低下に応じてデアイスサイクルを開始させるよう
にして上記不具合を克服することを目的とする。 The present invention has been made in view of the above-mentioned circumstances. For example, the present invention suppresses fluctuations in the temperature difference between the air temperature at the inlet and outlet of the user-side heat exchanger based on the change in air volume caused by switching the air volume of the fan on the user side (indoor side). It is an object of the present invention to overcome the above-mentioned problems by performing automatic correction and starting a de-ice cycle in response to a decrease in heating capacity due to accumulation of frost on a heat source side heat exchanger.
以下第２図ないし第４図に例示した本発明の好
適な実施例について詳述する。 Preferred embodiments of the present invention illustrated in FIGS. 2 to 4 will be described in detail below.
第２図は空気熱源ヒートポンプ式空気調和機を
系統的に示したものである。第２図において、符
号１は冷媒圧縮機、２は四方切換弁、３は熱源側
熱交換器、４は断熱膨張用絞りである毛細管、５
は利用側熱交換器、６は利用側熱交換器５に送風
するための送風機７の駆動用電動機、７は利用側
送風機、８は熱源側送風機９の駆動用電動機、９
は熱源側熱交換器３に送風するための送風機、１
０は利用側熱交換器５に吸込まれる空気の温度を
感知する素子、１１は利用側熱交換器５から吹出
された空気の温度を感知する素子、１２は電子制
御部である。暖房運転時は冷媒は実線矢印に示す
ように流れる。除霜（デフロスト）運転時および
冷房運転時は、四方切換弁２を切換えることによ
り、冷媒は破線矢印に示すように流れる。 FIG. 2 systematically shows an air source heat pump type air conditioner. In FIG. 2, numeral 1 is a refrigerant compressor, 2 is a four-way switching valve, 3 is a heat source side heat exchanger, 4 is a capillary tube that is an adiabatic expansion throttle, and 5 is a refrigerant compressor.
6 is a drive motor for the blower 7 for blowing air to the heat exchanger 5 on the use side; 7 is a drive motor for the use side blower; 8 is a drive motor for the heat source side blower 9;
1 is a blower for blowing air to the heat source side heat exchanger 3;
0 is an element that senses the temperature of the air sucked into the user-side heat exchanger 5, 11 is an element that senses the temperature of the air blown out from the user-side heat exchanger 5, and 12 is an electronic control unit. During heating operation, the refrigerant flows as shown by the solid arrow. During defrosting operation and cooling operation, by switching the four-way switching valve 2, the refrigerant flows as shown by the broken line arrow.
電子制御部１２は、第３図に示すとおり、室内
側吸込空気の温度を感知する素子１０と室内側吹
出空気の温度を感知する素子１１とで検知される
利用側熱交換器によつてもたらされる温度差（以
下温度差という）を求める比較回路１３と、室内
側送風用の電動機６の速度切換時に切換信号を出
す信号発生回路１４と、この信号発生回路１４か
ら速度切換信号を受けた時にタイマカウントを始
動するタイマ回路１５と、信号発生回路１４から
速度切換信号を受けた時の温度差を記憶する記憶
回路１６と、タイマ始動時即ち送風機７の速度切
換時の温度差であつて記憶回路１６に記憶されて
いる温度差とタイマ回路１５の設定時間経過後の
比較回路１３で求められた温度差とを比較して補
正係数を求める演算回路１７と、この演算回路１
７で求まつた補正係数を使つて比較回路１３で求
められた温度差を補正する補正回路１８と、この
補正回路で補正された温度差の最大値を記憶する
最大記憶回路１９と、補正回路１８で補正された
温度差が最大値記憶回路１９にて記憶された最大
値に対してある割合まで減少した時、デアイス開
始信号を出す除霜開始判定回路２０と、演算回路
１７の補正係数および最大値記憶回路１９の内容
をリセツトする指令装置２１とから構成される。 As shown in FIG. 3, the electronic control unit 12 is operated by the user-side heat exchanger, which is detected by an element 10 that senses the temperature of the indoor intake air and an element 11 that senses the temperature of the indoor air blown out. a comparison circuit 13 that calculates the temperature difference (hereinafter referred to as temperature difference); a signal generation circuit 14 that outputs a switching signal when switching the speed of the indoor ventilation motor 6; A timer circuit 15 that starts timer counting, a memory circuit 16 that stores the temperature difference when receiving the speed switching signal from the signal generation circuit 14, and a storage circuit 16 that stores the temperature difference when the timer starts, that is, when the speed of the blower 7 is switched. an arithmetic circuit 17 for calculating a correction coefficient by comparing the temperature difference stored in the circuit 16 with the temperature difference found by the comparison circuit 13 after the elapse of the set time of the timer circuit 15;
a correction circuit 18 for correcting the temperature difference obtained by the comparator circuit 13 using the correction coefficient obtained in step 7; a maximum storage circuit 19 for storing the maximum value of the temperature difference corrected by this correction circuit; and a correction circuit. When the temperature difference corrected in step 18 decreases to a certain percentage with respect to the maximum value stored in the maximum value storage circuit 19, a defrosting start determination circuit 20 outputs a deice start signal, and a correction coefficient of the arithmetic circuit 17 and It is composed of a command device 21 for resetting the contents of the maximum value storage circuit 19.
次に作用について述べる。 Next, we will discuss the effect.
暖房運転時において、外気温の低下等により熱
源側熱交換器３の表面に着霜が進行すると、暖房
能力が低下し始め、効率の良い暖房運転を阻害す
る。そこで霜の蓄積によつて暖房能力の低下が激
しくなる前に霜を溶かす必要がある。本発明方法
では以下のように除霜運転の制御を行なう。 During heating operation, if frost builds up on the surface of the heat source side heat exchanger 3 due to a drop in outside temperature or the like, the heating capacity begins to decrease, which impedes efficient heating operation. Therefore, it is necessary to melt the frost before the heating capacity deteriorates significantly due to the accumulation of frost. In the method of the present invention, defrosting operation is controlled as follows.
利用側熱交換器５の入口空気温度TIを素子１
０で、出口空気温度TOを素子１１でそれぞれ感
知し、それらの信号は電子制御部１２へ供給され
る。第４図に示すように、ヒートポンプを暖房運
転とし、室内送風機用電動機６の速度を中速Me
として時間tOで起動すると、利用側熱交換器５を
流過する冷媒温度は次第に上昇する。室内空気は
この利用側熱交換器５を流過する際、冷媒と熱交
換して昇温するので、吸込空気温度TIと吹出空
気温度TOとの差、即ち温度差ΔT＝TO−TIは次
第に上昇して、起動後のある時間経過後には、温
度差ΔTはある最高値Ｂに達する。その後、熱源
側熱交換器３への着霜に基く暖房能力の低下によ
り温度差ΔTが次第に減少していく。この間、素
子１０，１１により検知された夫々の温度TIお
よびTOは電子制御部１２の比較回路１３に入力
される。比較回路１３では温度TIとTOとの差ΔT
が求められ、この差ΔTは補正回路１８を経て記
憶回路１９に入力される。この時点での補正係数
ｋは１なので補正なしで記憶回路１９に入力され
ていき、記憶回路１９にはΔTの最高値Ｂが記憶
される。 The inlet air temperature T I of the heat exchanger 5 on the user side is set to element 1.
0, the outlet air temperature T O is sensed by the elements 11, and their signals are supplied to the electronic control unit 12. As shown in FIG.
When the refrigerant is started at time t O , the temperature of the refrigerant flowing through the user-side heat exchanger 5 gradually rises. When the indoor air flows through this user-side heat exchanger 5, it exchanges heat with the refrigerant and rises in temperature, so the difference between the suction air temperature T I and the outlet air temperature T O , that is, the temperature difference ΔT = T O − T I gradually increases, and after a certain period of time after startup, the temperature difference ΔT reaches a certain maximum value B. Thereafter, the temperature difference ΔT gradually decreases due to a decrease in heating capacity due to frost formation on the heat source side heat exchanger 3. During this time, the respective temperatures T I and T O detected by the elements 10 and 11 are input to the comparison circuit 13 of the electronic control section 12 . In the comparator circuit 13, the difference ΔT between the temperatures T I and T O
is determined, and this difference ΔT is input to the storage circuit 19 via the correction circuit 18. Since the correction coefficient k at this point is 1, it is input to the storage circuit 19 without correction, and the maximum value B of ΔT is stored in the storage circuit 19.
時間t1経過後に、第４図に示すように室内側送
風機用電動機６の速度を人為的に中速Meから低
速LOに切換えたとする。この時、速度を切換た
ことを示す信号が信号発生回路１４に入力され
る。この信号発生回路１４は電動機６の速度切換
信号をタイマ回路１５および記憶回路１６へ同時
に出力する。速度切換後に温度TIおよびTOが安
定するに要する時間を予め設定してあるタイマ回
路１５は速度切換信号を受けるとその予め設定し
た時間をカウント開始する。また記憶回路１６は
速度切換時の空気温度差ΔT（t1）を比較回路１３
を介して受入れて記憶する。タイマ回路１５が設
定時間をカウントし終えた時（タイムアツプした
時）（第４図の時間t2）、その時点t2において比較
回路１３で求められた温度差ΔT（t2）と記憶回路
１６に記憶されている速度切換時t1の温度差ΔT
（t1）とが演算回路１７へ供給される。演算回路
１７では、時間t2および時間t1の両温度差ΔT（t2）
およびΔT（t1）を比較し、補正係数ｋを求める。
ここで補正係数ｋは次のように表わすことができ
る。 Assume that after time t1 has elapsed, the speed of the indoor blower electric motor 6 is artificially switched from medium speed Me to low speed L O as shown in FIG. At this time, a signal indicating that the speed has been switched is input to the signal generating circuit 14. This signal generating circuit 14 simultaneously outputs a speed switching signal for the electric motor 6 to a timer circuit 15 and a memory circuit 16. The timer circuit 15, which has a preset time required for the temperatures T I and T O to stabilize after speed switching, starts counting the preset time upon receiving the speed switching signal. In addition, the memory circuit 16 stores the air temperature difference ΔT (t 1 ) at the time of speed switching in the comparison circuit 13.
Accept and store via . When the timer circuit 15 finishes counting the set time (time up) (time t 2 in FIG. 4), the temperature difference ΔT (t 2 ) found by the comparator circuit 13 at that time t 2 and the memory circuit 16 Temperature difference ΔT at t 1 during speed switching stored in
(t 1 ) is supplied to the arithmetic circuit 17. In the arithmetic circuit 17, the temperature difference ΔT (t 2 ) between time t 2 and time t 1
and ΔT(t 1 ) to determine the correction coefficient k.
Here, the correction coefficient k can be expressed as follows.
ｋ＝ΔT（t1）／ΔT（t2）
演算回路１７で求められた補正係数ｋは補正回
路１８へ入力される。補正回路１８はこの補正係
数ｋを受け入れた後は、再び送風機用電動機６の
速度が切換るまで、比較回路１３から継続的に入
力される温度ΔT（ｔ）を補正してΔT´＝ｋ×ΔT
（ｔ）を出力する。具体的には、補正回路１８は、
第４図の時間t2からt3までは、素子１０および１
１で計測された空気温度差ΔT（ｔ）に補正係数
ｋを乗じた補正値ΔT′（ｔ）＝ｋ×ΔT（ｔ）を出力
して最大値記憶回路１９および判定回路２０に供
給する。最大値記憶回路１９は暖房運転開始時t0
より補正回路１８を介して入力されるが、電動機
６の速度切換前は補正係数ｋ＝１なので空気温度
差ΔT（ｔ）がそのまま入力され、速度切換後は
補正回路１８で補正された温度差ΔT′（ｔ）が入
力される。そしてこれらの温度差ΔT（ｔ）、
ΔT′（ｔ）の最大値Ｂを記憶する。この最大値記
憶回路１９に記憶されている記憶値に対して更に
大きな温度差ΔT′（ｔ）が入力されれば、記憶値
はその大きな温度差に更新されこれを記憶する。 k=ΔT(t 1 )/ΔT(t 2 ) The correction coefficient k determined by the arithmetic circuit 17 is input to the correction circuit 18. After accepting this correction coefficient k, the correction circuit 18 corrects the temperature ΔT(t) that is continuously input from the comparison circuit 13 until the speed of the blower motor 6 is changed again, so that ΔT′=k× ΔT
(t) is output. Specifically, the correction circuit 18
From time t 2 to t 3 in FIG.
A correction value ΔT′(t)=k×ΔT(t) obtained by multiplying the air temperature difference ΔT(t) measured in step 1 by a correction coefficient k is output and supplied to the maximum value storage circuit 19 and the determination circuit 20. The maximum value memory circuit 19 is set to t 0 at the start of heating operation.
However, since the correction coefficient k=1 before the speed switching of the electric motor 6, the air temperature difference ΔT(t) is input as is, and after the speed switching, the temperature difference corrected by the correction circuit 18 is inputted via the correction circuit 18. ΔT'(t) is input. And these temperature differences ΔT(t),
The maximum value B of ΔT'(t) is stored. If a larger temperature difference ΔT'(t) is inputted to the stored value stored in the maximum value storage circuit 19, the stored value is updated to the larger temperature difference and stored.
一方、除霜開始判定回路２０は最大値記憶回路
１９からの温度差最大値Ｂと補正回路１８で補正
された温度差を入力し、相互に比較することによ
り温度差最大値Ｂに対して補正回路１８で補正さ
れた温度差ΔT′（ｔ）が予め設定された割合Ｃ＝
Ａ／ＢとなるＡ値まで減少した時、即ち時間t3の
時デアイス開始信号を出力する。このデアイス開
始信号により図示しない手段により室内側送風用
電動機６および室外側送風用電動機８の運転は停
止され、かつ四方切換弁２は暖房運転状態から除
霜運転状態に切換えられて除霜運転が開始され
る。除霜の完了は図示しない手段により検出さ
れ、時間t4で再び暖房運転が再開される。即ち、
四方切換弁２を暖房状態に切換えると同時に室外
側送風用電動機８および室内送風用電動機６は第
４図の例であれば中速Meで再起動される。 On the other hand, the defrosting start determination circuit 20 inputs the maximum temperature difference value B from the maximum value storage circuit 19 and the temperature difference corrected by the correction circuit 18, and corrects the maximum temperature difference value B by comparing them with each other. The temperature difference ΔT′(t) corrected by the circuit 18 is the preset ratio C=
When the A value has decreased to A/B, that is, at time t3 , a de-ice start signal is output. In response to this de-ice start signal, the operation of the indoor fan motor 6 and the outdoor fan motor 8 is stopped by a means not shown, and the four-way switching valve 2 is switched from the heating operating state to the defrosting operating state, and the defrosting operation is started. Begins. Completion of defrosting is detected by means not shown, and heating operation is restarted again at time t4 . That is,
At the same time as the four-way switching valve 2 is switched to the heating state, the outdoor air blowing electric motor 8 and the indoor air blowing electric motor 6 are restarted at medium speed Me in the example of FIG. 4.
以後、デアイス（除霜）運転終了後、再びデア
イス運転を開始させるまでの１サイクル中に送風
用電動機６の速度が切換えられた場合は、切換の
都度同様の方法で空気温度差ΔT（ｔ）を補正演
算し、その補正値ΔT′（ｔ）を用いてＡおよびＢ
を対比し、デアイス開始条件を判定させるのであ
る。 Thereafter, if the speed of the blower electric motor 6 is changed during one cycle from the end of the de-ice operation until the start of the de-ice operation again, the air temperature difference ΔT(t) is determined in the same manner each time the speed is changed. A and B are calculated using the correction value ΔT′(t).
The conditions for starting de-ice are determined by comparing the conditions.
第４図に例示した除霜サイクルについて説明す
る。第４図において、実際に感知された利用側熱
交換器５の入口および出口の空気温度差ΔT（ｔ）
を実線で、また補正回路１８で補正された空気温
度差ΔT′（ｔ）を破線で示してある。 The defrosting cycle illustrated in FIG. 4 will be explained. In FIG. 4, the actually sensed air temperature difference ΔT(t) at the inlet and outlet of the user-side heat exchanger 5
is shown by a solid line, and the air temperature difference ΔT'(t) corrected by the correction circuit 18 is shown by a broken line.
第１回目の除霜サイクルt0−t3において、時間
t0からt1までは室内側送風機７は中速Me、時間t1
からデアイス開始時間t3までは低速TOに速度変換
した場合を示す。 In the first defrosting cycle t 0 - t 3 , the time
From t 0 to t 1 , the indoor fan 7 is at medium speed Me, and time t 1
The period from to de-ice start time t 3 shows the case where the speed is converted to low-speed TO .
従来の制御方式では、時間t1で風量が変化すれ
ば空気温度差ΔT（ｔ）が変動し、この温度差ΔT
（ｔ）が設定値Ａに達する時間t5で初めてデアイ
スが開始される。したがつて、時間t3−t5の間デ
アイス開始時期が遅れ、効率のよい暖房運転が行
なわれない。 In the conventional control method, if the air volume changes at time t1 , the air temperature difference ΔT(t) changes, and this temperature difference ΔT
De-ice is started only at time t 5 when (t) reaches the set value A. Therefore, the start of de-icing is delayed for a period of time t3 - t5 , and efficient heating operation is not performed.
本発明によれば、風量変化後に温度差ΔTの補
正を行なう（実際には補正計算は空気温度差が安
定した時間t2から行なう）ので、第４図において
破線で示すように空気温度差ΔT′（ｔ）を演算お
よび記憶するので、暖房能力を正確に反映した値
にて、デアイスの開始条件を判定でき、効率のよ
い暖房運転を行なうことができる。第４図の場
合、１の除霜サイクルの最大温度差Ｂに対し設定
された値Ａの比率Ｃ＝Ａ／Ｂまで暖房能力が低下
した時デアイスを開始するようにしている。 According to the present invention, the temperature difference ΔT is corrected after the air volume changes (actually, the correction calculation is performed from time t 2 when the air temperature difference becomes stable), so the air temperature difference ΔT is '(t) is calculated and stored, the de-ice start condition can be determined using a value that accurately reflects the heating capacity, and efficient heating operation can be performed. In the case of FIG. 4, de-icing is started when the heating capacity decreases to the ratio C=A/B of the set value A to the maximum temperature difference B in one defrosting cycle.
次に、２回目の除霜サイクルでは時間t4からt6
までは室内側送風機７は中速Me、t6から２回目
のデアイス開始時間t9までは高速Hiに風量を人為
的に変化さけた場合である。 Then for the second defrost cycle from time t 4 to t 6
Up to this point, the indoor fan 7 is at medium speed Me, and from t6 to the second de-ice start time t9 , the air volume is artificially changed to high speed Hi.
補正のない従来方法では、第１回目の除霜サイ
クルとは逆に時間t6以後は、空気温度が実線に示
すように低下してデアイス開始の時期が必要以上
に早くなり（この場合、設定値Ａに達する時間t8
で除霜運転開始）、効率のよい暖房運転は行なわ
れない。 In the conventional method without correction, contrary to the first defrosting cycle, after time t6 , the air temperature decreases as shown by the solid line, causing the de-icing to start earlier than necessary (in this case, the Time to reach value A t 8
defrosting operation starts), efficient heating operation is not performed.
本発明によれば、時間t6以後は、破線のように
補正された空気温度差ΔT′（ｔ）を判定回路２０
に出力するので的確にデアイス開始条件を判定で
き、効率のよい暖房運転ができる。 According to the present invention, after time t6 , the judgment circuit 20 calculates the corrected air temperature difference ΔT'(t) as shown by the broken line.
Since the de-ice start conditions can be accurately determined, efficient heating operation can be achieved.
なお、暖房運転開始時は、その指令装置２１か
らの信号により最大値記憶回路１９の記憶値はゼ
ロにリセツトされ、かつ演算回路１７の補正係数
ｋはｋ＝１にセツトされる。 At the start of the heating operation, the stored value of the maximum value storage circuit 19 is reset to zero by a signal from the command device 21, and the correction coefficient k of the arithmetic circuit 17 is set to k=1.
補正係数ｋは室内側送風用電動機６の運転開始
から電動機６の速度が最初に切換つてタイマ回路
１５がタイムアツプして演算回路１７で新たな補
正係数が求められるまでは補正係数はｋ＝１にリ
セツトされている。 The correction coefficient k is 1 from the start of operation of the indoor ventilation motor 6 until the speed of the motor 6 is first switched, the timer circuit 15 times up, and a new correction coefficient is determined by the arithmetic circuit 17. It has been reset.
したがつて補正回路１８はタイマ回路１５がタ
イムアツプして演算回路１７で新たな補正係数が
求められるまでは比較回路１３で求められた温度
差をそのまま最大値記憶回路１９に送りこの記憶
回路１９ではその温度差の最大値を記憶すること
になる。 Therefore, the correction circuit 18 sends the temperature difference obtained by the comparison circuit 13 as it is to the maximum value storage circuit 19 until the timer circuit 15 times up and a new correction coefficient is obtained by the arithmetic circuit 17. The maximum value of the temperature difference will be stored.
このことは、暖房中に暖房運転を停止してその
後再運転する場合、および除霜運転終了後暖房運
転を再開する場合も同様である。 This also applies when the heating operation is stopped during heating and then restarted, and when the heating operation is restarted after the defrosting operation is finished.
以上本発明をその好適な実施例について詳述し
たが本発明はこの特定の実施例に限定されるもの
ではなく、本発明の精神を逸脱しない範囲で幾多
の変化変形が可能である。たとえば実施例におい
ては利用側フアンの回転速度に基いて利用側熱交
換器の出入口温度差の変動を補正しているが、利
用側熱交換器の熱交換能力を左右する因子はその
利用側フアンの回転速度の切換え以外にも補助ヒ
ータのON−OFF、圧縮機の容量制御等があるた
め、それらの外乱に基いて温度差の変動を補正す
るようにしてもよい。 Although the present invention has been described above in detail with reference to its preferred embodiment, the present invention is not limited to this specific embodiment, and can be modified in many ways without departing from the spirit of the invention. For example, in the embodiment, the variation in the temperature difference between the inlet and outlet of the user heat exchanger is corrected based on the rotation speed of the user fan, but the factor that influences the heat exchange capacity of the user heat exchanger is the user fan. In addition to switching the rotational speed, there are other functions such as turning on and off the auxiliary heater and controlling the capacity of the compressor, so it is also possible to correct the fluctuation in temperature difference based on these disturbances.
第１図は従来の除霜サイクルを例示した図、第
２図は空気熱源ヒートポンプ式空気調和機の系統
図、第３図は電子制御部の内部ブロツク図、第４
図は本発明による除霜サイクルを例示した図であ
る。
１……冷媒圧縮機、２……四方切換弁、３……
熱源側熱交換機、４……毛細管、５……利用側熱
交換機、６……電動機、７……送風機、８……電
動機、９……送風機、１０，１１……温度を感知
する素子、１２……電子制御部、１３……比較回
路、１４……信号発生回路、１５……タイマ回
路、１６……記憶回路、１７……演算回路、１８
……補正回路、１９……最大値記憶回路、２０…
…除霜開始判定回路、２１……指令装置。
Fig. 1 is a diagram illustrating a conventional defrosting cycle, Fig. 2 is a system diagram of an air source heat pump type air conditioner, Fig. 3 is an internal block diagram of the electronic control unit, and Fig. 4 is a diagram illustrating a conventional defrosting cycle.
The figure is a diagram illustrating a defrosting cycle according to the present invention. 1... Refrigerant compressor, 2... Four-way switching valve, 3...
Heat source side heat exchanger, 4...Capillary tube, 5...Using side heat exchanger, 6...Electric motor, 7...Blower, 8...Electric motor, 9...Blower, 10, 11...Temperature sensing element, 12 ...Electronic control unit, 13...Comparison circuit, 14...Signal generation circuit, 15...Timer circuit, 16...Storage circuit, 17...Arithmetic circuit, 18
...Correction circuit, 19...Maximum value storage circuit, 20...
...Defrosting start determination circuit, 21... Command device.
Claims (1)
流体の温度差を検出し、デアイスを行ないながら
運転しているときの１サイクルの最大温度差を記
憶し、熱源側熱交換器への霜の蓄積により温度差
が減少していく過程における温度差が記憶してあ
る最大温度差に対し設定された割合まで低下した
ときデアイスを開始するようにした除霜方法にお
いて、流体の流量切換等の熱源側熱交換器への霜
の蓄積以外の外乱による上記温度差の変化の前後
の安定状態における温度差を比較演算して補正係
数を算出し、上記外乱の発生の後は温度差に補正
係数を乗じてなる補正値を出力し、この補正値の
最大温度差を記憶し、補正値がその最大温度差に
対し設定された割合まで低下したときデアイスを
開始することを特徴とする除霜方法。1. Detects the temperature difference in the fluid caused by the fluid flowing through the heat exchanger on the user side, stores the maximum temperature difference in one cycle when operating while performing de-icing, and prevents frost from flowing into the heat exchanger on the heat source side. In a defrosting method that starts de-icing when the temperature difference decreases to a set percentage of the stored maximum temperature difference during the process of decreasing the temperature difference due to accumulation, a heat source such as fluid flow rate switching is used. A correction coefficient is calculated by comparing the temperature difference in the stable state before and after the change in the temperature difference due to a disturbance other than the accumulation of frost on the side heat exchanger, and after the occurrence of the above disturbance, a correction coefficient is applied to the temperature difference. A defrosting method characterized by outputting a correction value obtained by multiplying the correction value, storing a maximum temperature difference of this correction value, and starting de-icing when the correction value decreases to a set ratio with respect to the maximum temperature difference.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57051008A JPS58168848A (en) | 1982-03-31 | 1982-03-31 | Defrosting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57051008A JPS58168848A (en) | 1982-03-31 | 1982-03-31 | Defrosting method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58168848A JPS58168848A (en) | 1983-10-05 |
| JPH0381060B2 true JPH0381060B2 (en) | 1991-12-26 |
Family
ID=12874743
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57051008A Granted JPS58168848A (en) | 1982-03-31 | 1982-03-31 | Defrosting method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58168848A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5989958A (en) * | 1982-11-11 | 1984-05-24 | 三菱重工業株式会社 | Defrosting method |
| JP2575063B2 (en) * | 1990-03-09 | 1997-01-22 | シャープ株式会社 | Air conditioner |
| JP7390807B2 (en) * | 2019-06-11 | 2023-12-04 | 清水建設株式会社 | air conditioning system |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5772033U (en) * | 1980-10-20 | 1982-05-01 | ||
| JPS57148516U (en) * | 1981-03-16 | 1982-09-18 |
-
1982
- 1982-03-31 JP JP57051008A patent/JPS58168848A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58168848A (en) | 1983-10-05 |
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