JPS61225594A - Method to control flow rate of heat exchanger - Google Patents
Method to control flow rate of heat exchangerInfo
- Publication number
- JPS61225594A JPS61225594A JP6709885A JP6709885A JPS61225594A JP S61225594 A JPS61225594 A JP S61225594A JP 6709885 A JP6709885 A JP 6709885A JP 6709885 A JP6709885 A JP 6709885A JP S61225594 A JPS61225594 A JP S61225594A
- Authority
- JP
- Japan
- Prior art keywords
- flow rate
- flow
- flow path
- value
- total
- 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.)
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Abstract
Description
【発明の詳細な説明】
[発明の技術分野]
この発明は、例えば加熱炉のような熱交換器の流量コン
トロール方式に関する。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a flow rate control system for a heat exchanger such as a heating furnace.
[発明の技術的背景およびその問題点]一般に、石油、
石油化学関係のプラントにおいては、各種蒸留塔や反応
塔に対して供給する原料を加熱するために複数の流路を
有する加熱炉のような熱交換器が用いられ、そのような
熱交換器は第4図に示すような流量コントロール方式を
採用している。つまり、熱交換器としての加熱炉1に対
して複数本の流路、例えば第1、第2、第3流路2−1
.2−2.2−3が備えられ、この各流路2−1.2−
2.2−3に対する原料流量を調節する流量調整弁3−
1.3−2.3−3を設けている。そして加熱炉1にお
いて熱交換され加熱された原料の各流路2−1.2−2
.2−3の出口温度が等しくなるように流量を調節する
ために、出口温度計4−1.4−2.4−3が設けられ
ている。更に各流路2−1.2−2.2−3にはそれぞ
れ流量計5−1.5−2.5−3が設けられており、こ
の各流量計からの信号は流量調節計6−1.6−2.6
−3に与えられるようにしである。この流量調節計6−
1.6−2.6−3はそれぞれ流量設定値増加減演算部
7−1.7−2゜7−3からの設定値情報を流量計5−
1.5−2゜5−3からの流量情報と比較し、設定値に
実流量が合致するように流量調整弁3−1.3−2.3
−3を調整するものである。[Technical background of the invention and its problems] Generally, petroleum,
In petrochemical-related plants, heat exchangers such as heating furnaces with multiple flow paths are used to heat the raw materials supplied to various distillation columns and reaction columns. A flow rate control method as shown in Figure 4 is adopted. In other words, for the heating furnace 1 as a heat exchanger, there are a plurality of channels, for example, first, second, and third channels 2-1.
.. 2-2.2-3 is provided, and each flow path 2-1.2-
2. Flow rate adjustment valve 3- that adjusts the raw material flow rate for 2-3
1.3-2.3-3 are provided. And each flow path 2-1.2-2 of the raw material heated by heat exchange in the heating furnace 1
.. Outlet thermometers 4-1.4-2.4-3 are provided to adjust the flow rates so that the outlet temperatures of 2-3 are equal. Furthermore, each flow path 2-1.2-2.2-3 is provided with a flow meter 5-1.5-2.5-3, and the signals from each flow meter are sent to a flow controller 6-3. 1.6-2.6
-3 as given below. This flow rate controller 6-
1.6-2.6-3 respectively transmit the set value information from the flow rate set value increase/decrease calculation unit 7-1.7-2 and 7-3 to the flow meter 5-
Compare the flow rate information from 1.5-2゜5-3 and adjust the flow rate adjustment valve 3-1.3-2.3 so that the actual flow rate matches the set value.
-3 is adjusted.
また各流量計からの信号は流量加算部8に与えられてそ
こで積算され、総流量が総流量制御部9に与えられる。Further, the signals from each flow meter are applied to a flow rate adding section 8 where they are integrated, and the total flow rate is provided to a total flow rate control section 9.
この総流量調節計9は総流量設定値を実際の総流量と比
較し、各流路2−1.2−2.2−3に対して流ffi
設定値の増減情報を与えるものである。This total flow rate controller 9 compares the total flow rate set value with the actual total flow rate, and adjusts the flow ffi for each flow path 2-1.2-2.2-3.
This provides information on increases and decreases in setting values.
このような構成の流量コントロール方式においては、各
流路2−1.2−2.2−3の流量合計値を制御対象と
する一次ループL1があり、総流量はこの一次ループL
1によって制御され、二次ループL2に相当する各流路
2−1.2−2.2−3の流量ループは流路中のいずれ
か1つの出口温度があらかじめ定められたギャップ幅を
越えた時にある一定量設定値を変更する撮能と、各流路
の流量をその設定値に従うよう制御するためのものとな
っている。従って、第5図に示すように今、第1流路2
−1の温度がギャップ幅を越えて上昇したためにその流
路の原料流量を増加させるべく設定値を増加させるとき
、他の流路2−2.2−3°についてはフィードバック
制御が直ちにかがるわけではないため、流量は元の設定
値のまま維持される。その結果として総流量は第1流路
2−1の増加分だけ増加し、総流量調節計9がフィード
バック制御を始め、各流路の流量調節計6−1゜6−2
.6−3に対して一定時間へtに遅れて設定値減少信号
を与え、各流量調整弁3−1.3−2.3−3を絞り、
総流量を元の設定値に合うように制御することになるの
である。その結果実際の総流量は第5図(d )に示す
ように流路の1っに流量変化があった場合に変動を受け
、元の総流量設定値に復帰するまでにいくらかの時間遅
れ6丁が生じ、総流量を常に一定にしたままで各流路の
流量調整を行なうことは不可能であった。In the flow rate control method with such a configuration, there is a primary loop L1 that controls the total flow rate of each flow path 2-1.2-2.2-3, and the total flow rate is determined by this primary loop L1.
1, and the flow rate loops of each flow path 2-1.2-2.2-3 corresponding to the secondary loop L2 are such that the outlet temperature of any one of the flow paths exceeds a predetermined gap width. It is used to sometimes change a set value by a certain amount, and to control the flow rate of each flow path so that it follows the set value. Therefore, as shown in FIG.
When the set value is increased to increase the raw material flow rate in that channel because the temperature in -1 has increased beyond the gap width, feedback control is immediately activated for the other channels 2-2, 2-3°. The flow rate remains at the original setting. As a result, the total flow rate increases by the amount of increase in the first flow path 2-1, and the total flow rate controller 9 starts feedback control, and the flow rate controllers 6-1, 6-2 of each flow path increase.
.. A set value reduction signal is given to 6-3 with a delay of t for a certain period of time, and each flow rate adjustment valve 3-1.3-2.3-3 is throttled.
The total flow rate is controlled to match the original set value. As a result, the actual total flow rate will fluctuate when there is a change in flow rate in one of the flow paths, as shown in Figure 5(d), and there will be some time delay6 before returning to the original total flow rate set value. It was impossible to adjust the flow rate of each channel while keeping the total flow rate constant.
[発明の目的1
この発明はこのような従来の問題に鑑みてなされたもの
であって、流路の1つの流量を変更させる場合に、同時
に他の流路の流量もそれに見合った分だけ増減させ、総
流量は常に一定に維持したまま各流路の流量コントロー
ルを行なえるようにした熱交換器の流量コントロール方
式を提供することを目的とする。[Objective of the Invention 1] This invention has been made in view of such conventional problems, and when the flow rate of one flow path is changed, the flow rate of other flow paths is simultaneously increased or decreased by a commensurate amount. It is an object of the present invention to provide a flow rate control system for a heat exchanger that can control the flow rate of each flow path while keeping the total flow rate constant.
[発明の概要]
この発明は、原料を複数の流路に分割して熱交換器に通
して加熱若しくは冷却し、各流路出力部の総流量を設定
値に保持しっつ各流路の出口温度を同一の値にするため
の熱交換器の流量コントロール方式であって、各流路に
流量計、出口温度計及び8!量調整弁を備え、総流量設
定値がら各流路に対する流量配分値を与える総流量調節
計、この総流量調節計からの流量配分値を受けて各流路
の流量をコントロールするために前記各流Ill整弁を
コントロールする流路流量調節計、及び特定流路の出口
温度が平均温度から一定範囲を越えて開離した場合に、
前記出口温度が平均温度に近づく状態に前記特定流路の
流量を変更すると共にこの変更分に対応するmmを前記
特定流路以外の流路が吸収する値に各々の流量を変更さ
せる流路流量設定値の増加減演算部を備え、前記各流路
出力部の総流量を変えず各流路の出口温度を同一の値と
するものである。[Summary of the Invention] This invention divides a raw material into a plurality of channels and heats or cools it by passing it through a heat exchanger, and maintains the total flow rate of each channel output part at a set value. This is a flow rate control method for a heat exchanger to keep the outlet temperature at the same value, and each flow path is equipped with a flow meter, an outlet temperature meter, and an 8! A total flow controller equipped with a volume adjustment valve and providing a flow rate distribution value for each flow path from the total flow rate setting value, and a total flow rate controller that controls the flow rate of each flow path in response to the flow rate distribution value from the total flow rate controller. A flow path flow rate controller that controls the flow Ill regulation valve, and when the outlet temperature of a specific flow path deviates beyond a certain range from the average temperature,
A channel flow rate that changes the flow rate of the specific channel so that the outlet temperature approaches the average temperature, and changes each flow rate in mm corresponding to this change to a value that is absorbed by channels other than the specific channel. The apparatus includes an increase/decrease calculation section for a set value, and makes the outlet temperature of each channel the same value without changing the total flow rate of each channel output section.
[発明の実施例]
以下、この発明の一実施例を図に基づいて詳説する。第
1図はこの発明の一実施例を示すものであって、熱交換
器としての加熱炉11に対して複数の流路12−1.1
2−2.12−3が通じられ、加熱炉11においてその
中を流れる原料を加熱するようにしである。また各流路
−の流量を調整するため(F)illla整弁13−1
.13−2.13−3がそれぞれ設けられおり、原料出
口温度を測定するための温度計14−1.14−2.1
4−3が設けられている。各流路12−1.12−2゜
12−3を流れる原料の流量を増加するならば出口温度
は下り、逆に減少させるならば出口温度は上昇し、こう
して各流路の出口温度がほぼ一定範囲内に収まるように
流量調整によって出口温度を制御する。また各流路には
ぞれぞれ流量計15−1.15−2.15−3が設けら
れており、この各流量計からの流量信号は流量調節計1
6−1゜16−2.16−3にそれぞれ入力されるよう
になっている。 流量調節計16−1.16−2゜16
−3では、それぞれ流量設定値の増加減演算部17−1
.17−2.−17−3からの流路流量設定値を各流量
計からの流量値と比較し、各流路の流量が設定値に一致
するように流量調整弁13−1.13−2.13−3を
フィードバック制御する。[Embodiment of the Invention] Hereinafter, an embodiment of the present invention will be described in detail based on the drawings. FIG. 1 shows an embodiment of the present invention, in which a plurality of channels 12-1.1 are provided for a heating furnace 11 as a heat exchanger.
2-2.12-3 is passed through the heating furnace 11 to heat the raw material flowing therethrough. In addition, to adjust the flow rate of each flow path, (F)illa regulating valve 13-1
.. 13-2, 13-3 are provided respectively, and a thermometer 14-1.14-2.1 is provided to measure the raw material outlet temperature.
4-3 is provided. If the flow rate of the raw material flowing through each channel 12-1, 12-2, 12-3 is increased, the outlet temperature will decrease, and if it is decreased, the outlet temperature will increase, and in this way, the outlet temperature of each channel will be approximately The outlet temperature is controlled by adjusting the flow rate so that it stays within a certain range. Each flow path is provided with a flow meter 15-1, 15-2, 15-3, and the flow signal from each flow meter is sent to a flow controller 1.
6-1, 16-2, and 16-3, respectively. Flow rate controller 16-1.16-2゜16
-3, respectively, the increase/decrease calculation unit 17-1 for the flow rate setting value.
.. 17-2. Compare the channel flow rate set value from -17-3 with the flow rate value from each flow meter, and adjust the flow rate adjustment valve 13-1.13-2.13-3 so that the flow rate of each channel matches the set value. feedback control.
前記各流量設定値の増加減演算部17−1.17−2.
17−3に対しては総流量調節計18から各流路配分値
が設定値として与えられる。更にこの各流量設定値増加
減演算部17−1.17−2.17−3は第2図に示す
構成を有するものであって、各流路の温度計14−1.
14−2.14−3からの温度信号を受け、各流路の出
口温度の平均値に対して特定の流路の出口温度がある一
定のギャップ幅を越えて開離している場合、その流路の
流量を変更すべく流−11115計16−1.16−2
.16−3に対して新たな流量設定値を与える働きをす
る。Increase/decrease calculation unit 17-1.17-2 for each flow rate setting value.
17-3, each flow path distribution value is given as a set value from the total flow rate controller 18. Furthermore, each flow rate set value increase/decrease calculation section 17-1.17-2.17-3 has the configuration shown in FIG.
14-2. Upon receiving the temperature signal from 14-3, if the outlet temperature of a particular flow path is separated by a certain gap width from the average value of the outlet temperature of each flow path, that flow In order to change the flow rate of the flow-11115 total 16-1.16-2
.. It functions to give a new flow rate setting value to 16-3.
この流量設定値増加減演算部の流量設定値の演算機能を
更に説明すると、各流路12−1..12−2.12−
3の出口平均温度と各流路の出口温度との偏差が常に監
視されている。そこで、流路12−1.2−2.12−
3の内の1つでもあらかじめ定められたギャップ幅を上
回るものがあった場合、その特定の流路に対してあらか
じめ定められたある一定量の設定値変更をしたと同等の
効果を与えるべく、総流量の合計値を変えないように付
随する他の流路の設定値変更を以下の式により算出し、
各流量調節計に新たな流量設定値を与えるのである。To further explain the flow rate set value calculation function of this flow rate set value increase/decrease calculation section, each flow path 12-1. .. 12-2.12-
The deviation between the average outlet temperature of No. 3 and the outlet temperature of each channel is constantly monitored. Therefore, the flow path 12-1.2-2.12-
If even one of the above three gap widths exceeds the predetermined gap width, in order to give the same effect as changing the set value by a certain amount predetermined for that specific flow path, Calculate the setting value changes of other accompanying flow paths so as not to change the total value of the total flow rate using the following formula,
A new flow rate setting value is given to each flow controller.
今、流路数をn、各流路の流量設定値変更前の流量を口
(第i流路)とする。またあらかじめ定められた設定値
変更間をαiとする。但し、このαiはαO1−α0,
0の内いずれかを取るものとする。第:流路の流量がα
i増加し、他の流路の流量設定値は変化しないと考えた
場合の比率(「1+α+):(r2+α2):・・・:
(rt+αi):・・・:(fn+αn)
・・・(1)α、i :ao 、 −αoOr
Oと、全ての流路の流量を総流量が変化しないように
増減させたときの比率
<f+ +Δf+):(f2+Δf2):・・・:(f
1+Δft) : ・: (fn+Δfn)
−(2)を等しくすると、各流路の熱効率の比が
変化してしないと仮定するならば、前記第i流路の流山
のみαiだけ変化したのと同じ効果が傳られる。Now, let the number of channels be n, and the flow rate before changing the flow rate setting value of each channel be the port (i-th channel). Further, a predetermined setting value change interval is defined as αi. However, this αi is αO1−α0,
One of 0 shall be taken. No.: The flow rate of the flow path is α
The ratio when considering that i increases and the flow rate setting values of other channels do not change (1+α+):(r2+α2):...:
(rt+αi):...:(fn+αn)
...(1) α, i :ao, -αoOr
O and the ratio when the flow rate of all channels is increased or decreased so that the total flow rate remains unchanged<f+ +Δf+):(f2+Δf2):...:(f
1+Δft) : ・: (fn+Δfn)
If -(2) is made equal, and assuming that the ratio of thermal efficiencies of each flow path does not change, the same effect as when only the flow peak of the i-th flow path changes by αi will be produced.
上記(1)式と(2)との比をkとすると、(f 言
+Δf 1 ) /(f+ + α1 )=(f2
+Δf2)/(f2+α2)
=(fi+Δft) / (f i +αi )=
(fn+Δfn)/ (fn+an )=k
・・・(3)となる。If the ratio of the above equation (1) and (2) is k, then (f word
+Δf 1 ) /(f+ + α1 )=(f2
+Δf2)/(f2+α2) = (fi+Δft)/(f i +αi)=
(fn+Δfn)/(fn+an)=k
...(3).
この(3)式より
Δri=fi (k −1) +にα1
・・・(4)また変更後の総流量の総和は不変であるこ
とより、九
ΣΔfi= O・・・(5)
i二1
上記(4)、(5)式より、
ΣΔfi=Σfi (k −1)+Σにαi=o ・
・・(6)よって、
k−Σfi/ (Σfi+Σαi) ・・・
(7)上記(7)式を(4)式に代入するならば、第i
流路の流量設定値変更分が
Afi= (αi Ift−fHαi >/ (Efi
+Iαi )・・・(8)
となる。From this equation (3), Δri=fi (k −1) + α1
...(4) Also, since the sum of the total flow rates after change remains unchanged, 9ΣΔfi=O...(5) i21 From equations (4) and (5) above, ΣΔfi=Σfi (k −1)+Σ and αi=o ・
...(6) Therefore, k-Σfi/ (Σfi+Σαi) ...
(7) If we substitute equation (7) above into equation (4), then the i-th
The flow rate setting value change of the flow path is Afi = (αi Ift-fHαi >/ (Efi
+Iαi)...(8).
従って、温度計の測定結果からα0が与えられた時、上
記(8)式で計算される量を総FEfi調節計18から
の分配設定値に対して積算することにより新たな設定値
を各流量調節計16−1.16−2゜16−3に与える
。そしてこの値を基に各流路の流量をフィードバックl
l1lJ lftすることにより各流路の出口温度がほ
ぼ一定範囲に収まるように流量コントロールすることが
できるのである。つまり、第3図に示すように、例えば
第1流路12−1の出口温度が平均値に対しギャップ幅
以上に開離したためにその流量を増加させた場合、残り
の第2゜第3流路12−2.12−3の流量を第1流路
12−1の増分を補償するだけ減少させ、同図(d )
に示すように総流量は各流路の流量の変更の前後におい
てもほぼ一定に保つように制御できるのである。Therefore, when α0 is given from the measurement result of the thermometer, a new set value is determined for each flow rate by integrating the amount calculated by the above equation (8) with respect to the distribution set value from the total FEfi controller 18. Provided to controller 16-1.16-2°16-3. Then, based on this value, the flow rate of each flow path is fed back.
By l1lJ lft, it is possible to control the flow rate so that the outlet temperature of each flow path falls within a substantially constant range. In other words, as shown in FIG. 3, for example, if the outlet temperature of the first flow path 12-1 deviates from the average value by more than the gap width and the flow rate is increased, the remaining second and third flow paths 12-1 The flow rate in channels 12-2 and 12-3 is reduced by an amount that compensates for the increment in the first channel 12-1, as shown in FIG.
As shown in Figure 2, the total flow rate can be controlled to be kept almost constant even before and after changing the flow rate of each channel.
1発明の効果]
この発明は、複数の流路を備えた熱交換器において、特
定の流路の温度が変化したために流量を調整する必要が
生じた場合、その特定の流路の流量の増分を補償する分
だけ他の流路の流量を変更するように各流路の流量をコ
ントロールするため、総IIは常に一定に保ったまま各
流路の流量コントロールを行なうことができる利点があ
る。1. Effects of the Invention] This invention provides that in a heat exchanger equipped with a plurality of flow paths, when it becomes necessary to adjust the flow rate due to a change in the temperature of a specific flow path, the increment of the flow rate of the specific flow path is adjusted. Since the flow rate of each flow path is controlled so as to change the flow rate of the other flow paths by the amount that compensates for this, there is an advantage that the flow rate of each flow path can be controlled while keeping the total II constant.
【図面の簡単な説明】
第1図はこの発明の一実施例のシステム図、第2図は上
記実施例で用いる流路流儀設定値増加減演算部の詳細ブ
ロック図、第3図は上記実施例の制御動作を示すタイミ
ングチャート、第4図は従来例のシステム図、第5図は
従来例の動作を説明するタイミングチャートである。
11・・・加熱炉
12−1.12−2.12−3・・・流路13−1.1
3−2.13−3・・・?1lil整弁14−1.14
−2.14−3・・・温度計15−1.15−2.15
−3・・・流量計16−1.16−2.16−3・・・
流量調節計17−1.17−2.17−3・・・流量設
定値増加減演算部
18・・・総流量調節計
第8図
(d)輝1□[Brief Description of the Drawings] Fig. 1 is a system diagram of one embodiment of the present invention, Fig. 2 is a detailed block diagram of the flow path setting value increase/decrease calculation unit used in the above embodiment, and Fig. 3 is a system diagram of the above embodiment. FIG. 4 is a system diagram of the conventional example, and FIG. 5 is a timing chart illustrating the operation of the conventional example. 11...Heating furnace 12-1.12-2.12-3...Flow path 13-1.1
3-2.13-3...? 1lil valve control 14-1.14
-2.14-3...Thermometer 15-1.15-2.15
-3...Flowmeter 16-1.16-2.16-3...
Flow rate controller 17-1.17-2.17-3...Flow rate set value increase/decrease calculation unit 18...Total flow rate controller Fig. 8(d) Bright 1□
Claims (1)
くは冷却し、各流路出力部の総流量を設定値に保持しつ
つ各流路の出口温度を同一の値にするための熱交換器の
流量コントロール方式であつて、各流路に流量計、出口
温度計及び流量調整弁を備え、総流量設定値から各流路
に対する流量配分値を与える総流量調節計、この総流量
調節計からの流量配分値を受けて各流路の流量をコント
ロールするために前記各流量調整弁をコントロールする
流路流量調節計、及び特定流路の出口温度が平均温度か
ら一定範囲を越えて開離した場合に、前記出口温度が平
均温度に近づく状態に前記特定流路の流量を変更すると
共にこの変更分に対応する量を前記特定流路以外の流路
が吸収する値に各々の流量を変更させる流路流量設定値
の増加減演算部を備え、前記各流路出力部の総流量を変
えず各流路の出口温度を同一の値とする熱交換器の流量
コントロール方式。The raw material is divided into multiple flow paths and passed through a heat exchanger to be heated or cooled, and the total flow rate of each flow path output section is maintained at the set value while the outlet temperature of each flow path is made to the same value. A flow rate control method for a heat exchanger, in which each flow path is equipped with a flow meter, an outlet thermometer, and a flow rate adjustment valve, and a total flow rate controller that provides a flow rate distribution value for each flow path from a total flow rate set value. A flow path flow controller that controls each of the flow rate adjustment valves in order to control the flow rate of each flow path in response to the flow rate distribution value from the controller, and a flow path flow controller that controls the flow rate adjustment valves in order to control the flow rate of each flow path in response to the flow rate distribution value from the controller, and a When the flow rate is opened, the flow rate of the specific flow path is changed so that the outlet temperature approaches the average temperature, and each flow rate is adjusted to a value at which the flow paths other than the specific flow path absorb an amount corresponding to this change. A flow rate control method for a heat exchanger, comprising an increase/decrease calculation unit for a channel flow rate set value that changes the flow rate, and makes the outlet temperature of each channel the same value without changing the total flow rate of each channel output section.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6709885A JPS61225594A (en) | 1985-03-30 | 1985-03-30 | Method to control flow rate of heat exchanger |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6709885A JPS61225594A (en) | 1985-03-30 | 1985-03-30 | Method to control flow rate of heat exchanger |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS61225594A true JPS61225594A (en) | 1986-10-07 |
Family
ID=13335068
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP6709885A Pending JPS61225594A (en) | 1985-03-30 | 1985-03-30 | Method to control flow rate of heat exchanger |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS61225594A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5501265A (en) * | 1994-05-31 | 1996-03-26 | Carrier Corporation | Fluid flow control for HVAC system with valve position readjustment to equalize conditioning rates in multiple zones |
JP2005517161A (en) * | 2002-02-04 | 2005-06-09 | シーメンス アクチエンゲゼルシヤフト | Micro fluidic system |
JP2006029689A (en) * | 2004-07-16 | 2006-02-02 | Daikin Ind Ltd | Micro shunt |
-
1985
- 1985-03-30 JP JP6709885A patent/JPS61225594A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5501265A (en) * | 1994-05-31 | 1996-03-26 | Carrier Corporation | Fluid flow control for HVAC system with valve position readjustment to equalize conditioning rates in multiple zones |
JP2005517161A (en) * | 2002-02-04 | 2005-06-09 | シーメンス アクチエンゲゼルシヤフト | Micro fluidic system |
JP2006029689A (en) * | 2004-07-16 | 2006-02-02 | Daikin Ind Ltd | Micro shunt |
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