JP6967903B2

JP6967903B2 - Heat exchange system

Info

Publication number: JP6967903B2
Application number: JP2017150624A
Authority: JP
Inventors: 邦昭山田; 政吾神宮寺; 淳西澤; 伸一多川
Original assignee: Sanken Setsubi Kogyo Co Ltd
Current assignee: Sanken Setsubi Kogyo Co Ltd
Priority date: 2017-08-03
Filing date: 2017-08-03
Publication date: 2021-11-17
Anticipated expiration: 2037-08-03
Also published as: JP2019027750A

Description

本発明は熱交換システムに関し、特に適切な熱交換を行う熱交換システムに関する。 The present invention relates to a heat exchange system, and particularly to a heat exchange system that performs appropriate heat exchange.

２つの流体間で熱交換を行わせる熱交換器は、さまざまな分野で用いられている。熱交換器の用途の一例として、空気調和技術分野における空気と冷温水（冷水又は温水）とで熱交換を行わせる冷温水コイルがある。冷温水コイルでは、流出する空気の温度を所望の温度にするために、流入する冷温水の流量を制御する。冷温水コイルに流入する冷温水を所望の流量とするために、従来は、冷温水の配管路に流量計と弁の両者を配置し、流量計によって計測された流量に基づいて弁の開度を制御するようにしていたが、このような方法では、冷温水コイルを流れる流量に対応した流量計と弁の両者を設置しなければならず、コストアップを招来していた。このような不都合を解消する流量算出手段として、管路内を流れる流体の流量を規制する弁体の弁開度と流量係数との関係を示す特性テーブルを記憶するメモリと、このメモリ内の特性テーブルより弁体の現在の弁開度に応ずる流量係数を求め、求めた流量係数と弁体の現在の上下流間の差圧とに基づいて管路内を流れる流体の流量を算出する流量算出手段とを備えたものがある（例えば、特許文献１参照。）。 Heat exchangers that exchange heat between two fluids are used in various fields. As an example of the use of the heat exchanger, there is a cold / hot water coil that exchanges heat between air and cold / hot water (cold water or hot water) in the field of air conditioning technology. In the cold / hot water coil, the flow rate of the inflowing cold / hot water is controlled in order to bring the temperature of the outflowing air to a desired temperature. Conventionally, in order to obtain the desired flow rate of the cold / hot water flowing into the cold / hot water coil, both the flow meter and the valve are arranged in the cold / hot water piping line, and the opening of the valve is based on the flow rate measured by the flow meter. However, in such a method, both a flow meter and a valve corresponding to the flow rate flowing through the hot / cold water coil had to be installed, which led to an increase in cost. As a flow rate calculating means for eliminating such inconvenience, a memory that stores a characteristic table showing the relationship between the valve opening of the valve body that regulates the flow rate of the fluid flowing in the pipeline and the flow coefficient, and the characteristics in this memory. Find the flow coefficient according to the current valve opening of the valve body from the table, and calculate the flow rate of the fluid flowing in the pipeline based on the obtained flow coefficient and the differential pressure between the current upstream and downstream of the valve body. Some are provided with means (see, for example, Patent Document 1).

特開２０１０−１０７４１９号公報Japanese Unexamined Patent Publication No. 2010-107419

しかしながら、特許文献１に記載された流量算出手段では、あくまでも弁開度と差圧との関係に基づく計算上で流量を推定しているに過ぎず、制御対象流体の温度や圧力の変化等の外部要因に起因して、算出した流量が実際の流量から許容範囲を超えて乖離している場合が生じ得ることとなり、適切な熱交換が阻害されるおそれがある。 However, the flow rate calculating means described in Patent Document 1 merely estimates the flow rate by calculation based on the relationship between the valve opening degree and the differential pressure, and changes in the temperature and pressure of the fluid to be controlled, etc. Due to an external factor, the calculated flow rate may deviate from the actual flow rate beyond the permissible range, which may hinder appropriate heat exchange.

本発明は上述の課題に鑑み、熱搬送液体の実際の流量からの乖離を抑制しつつ適切な熱交換を行うことができる熱交換システムを提供することを目的とする。 In view of the above problems, it is an object of the present invention to provide a heat exchange system capable of performing appropriate heat exchange while suppressing deviation from the actual flow rate of the heat transfer liquid.

上記目的を達成するために、本発明の第１の態様に係る熱交換システムは、例えば図１に示すように、熱搬送液体ＣＨと温度調節対象物ＳＡとで熱交換させる熱交換部１５に出入りする熱搬送液体ＣＨを流す主流路１１と；主流路１１ｅに対して並列に設けられた副流路２１であって、主流路１１ｅよりも流路断面積が小さい副流路２１と；副流路２１に設けられた流量計２５と；流量計２５で検出された流量に基づいて熱交換部１５を流れる熱搬送液体ＣＨの流量を求める制御装置５０とを備える。 In order to achieve the above object, the heat exchange system according to the first aspect of the present invention has, for example, as shown in FIG. 1, a heat exchange unit 15 that exchanges heat between the heat transfer liquid CH and the temperature control object SA. A main flow path 11 through which a heat transport liquid CH entering and exiting flows; a sub-flow path 21 provided in parallel with the main flow path 11e and having a smaller flow path cross-sectional area than the main flow path 11e; A flow meter 25 provided in the flow path 21; and a control device 50 for obtaining the flow rate of the heat transport liquid CH flowing through the heat exchange unit 15 based on the flow rate detected by the flow meter 25.

このように構成すると、熱交換部を通過する流量よりも小さい流量を流量計で実際に計測した流量から熱交換部を流れる熱搬送液体の流量を求めるので、熱搬送液体の温度や圧力の変化等の外部要因にかかわらずに熱交換部を流れる熱搬送液体の流量を求めることができ、熱搬送液体と温度調節対象流体とで適切な熱交換を行うことができる。 With this configuration, the flow rate of the heat transfer liquid flowing through the heat exchange unit is obtained from the flow rate actually measured by the flow meter for the flow rate smaller than the flow rate passing through the heat exchange unit, so that the temperature and pressure of the heat transfer liquid change. Regardless of external factors such as, the flow rate of the heat transfer liquid flowing through the heat exchange unit can be obtained, and appropriate heat exchange can be performed between the heat transfer liquid and the temperature control target fluid.

また、本発明の第２の態様に係る熱交換システムは、例えば図１に示すように、上記本発明の第１の態様に係る熱交換システム１において、副流路２１は、第１の抵抗値を有する第１の抵抗流路２１ｆと；第１の抵抗値とは異なる第２の抵抗値を有する第２の抵抗流路２１ｓと；熱搬送液体ＣＨが第１の抵抗流路２１ｆを流れるのと第２の抵抗流路２１ｓを流れるのとを切り換える切換部２９とを有する。 Further, in the heat exchange system according to the second aspect of the present invention, for example, as shown in FIG. 1, in the heat exchange system 1 according to the first aspect of the present invention, the auxiliary flow path 21 is a first resistance. A first resistance flow path 21f having a value; a second resistance flow path 21s having a second resistance value different from the first resistance value; a heat transfer liquid CH flows through the first resistance flow path 21f. It has a switching unit 29 for switching between the invention and the flow through the second resistance flow path 21s.

このように構成すると、流量計で計測される流量の正確性を担保する幅を広げることができる。 With such a configuration, it is possible to widen the range of ensuring the accuracy of the flow rate measured by the flow meter.

また、本発明の第３の態様に係る熱交換システムは、例えば図１に示すように、上記本発明の第１の態様又は第２の態様に係る熱交換システム１において、熱交換システム１内を流れる熱搬送液体ＣＨの流量を調節する流量調節部１８と；温度調節対象物ＳＡの温度又は温度調節対象物ＳＡの温度と相関を有する検出対象の温度を検出する温度検出器３５とを備え；制御装置５０は、流量計２５で検出された流量に基づいて求められた熱交換部１５を流れる熱搬送液体ＣＨの流量が所定の流量の範囲内で、温度検出器３５で検出された温度があらかじめ設定された温度となるように流量調節部１８を制御する。典型的には、流量調節部１８は、副流路２１との分岐点１１ｘよりも上流側の主流路１１ｐ又は副流路２１との合流点１１ｙよりも下流側の主流路１１ｑに配設される。 Further, the heat exchange system according to the third aspect of the present invention is, for example, as shown in FIG. 1, in the heat exchange system 1 in the heat exchange system 1 according to the first aspect or the second aspect of the present invention. It is provided with a flow rate adjusting unit 18 for adjusting the flow rate of the heat transfer liquid CH flowing through the system; and a temperature detector 35 for detecting the temperature of the temperature control target SA or the temperature of the detection target having a correlation with the temperature of the temperature control target SA. The control device 50 has a temperature detected by the temperature detector 35 while the flow rate of the heat transport liquid CH flowing through the heat exchange unit 15 obtained based on the flow rate detected by the flow meter 25 is within a predetermined flow rate. Controls the flow rate adjusting unit 18 so that the temperature becomes a preset temperature. Typically, the flow rate adjusting unit 18 is arranged in the main flow path 11p on the upstream side of the branch point 11x with the sub flow path 21 or in the main flow path 11q on the downstream side of the confluence point 11y with the sub flow path 21. NS.

このように構成すると、熱量を効率よく得る範囲で熱搬送液体の流量調節を行うことが可能になる。 With this configuration, it is possible to adjust the flow rate of the heat transfer liquid within the range in which the amount of heat can be efficiently obtained.

また、本発明の第４の態様に係る熱交換システムは、例えば図１を参照して示すと、上記本発明の第３の態様に係る熱交換システム１において、制御装置５０は、温度検出器３５で検出された温度とあらかじめ設定された温度との乖離が大きいほど流量調節部１８の出力範囲を大きくするように構成されている。 Further, as shown in the heat exchange system according to the fourth aspect of the present invention, for example, with reference to FIG. 1, in the heat exchange system 1 according to the third aspect of the present invention, the control device 50 is a temperature detector. The output range of the flow rate adjusting unit 18 is configured to be larger as the deviation between the temperature detected in 35 and the preset temperature is larger.

このように構成すると、応答速度を速めながらハンチングを防ぐことができる。 With this configuration, hunting can be prevented while increasing the response speed.

本発明によれば、熱交換部を通過する流量よりも小さい流量を流量計で実際に計測した流量から熱交換部を流れる熱搬送液体の流量を求めるので、熱搬送液体の温度や圧力の変化等の外部要因にかかわらずに熱交換部を流れる熱搬送液体の流量を求めることができ、熱搬送液体と温度調節対象流体とで適切な熱交換を行うことができる。 According to the present invention, since the flow rate of the heat transfer liquid flowing through the heat exchange unit is obtained from the flow rate actually measured by the flow meter for the flow rate smaller than the flow rate passing through the heat exchange unit, the temperature and pressure of the heat transfer liquid change. Regardless of external factors such as, the flow rate of the heat transfer liquid flowing through the heat exchange unit can be obtained, and appropriate heat exchange can be performed between the heat transfer liquid and the temperature control target fluid.

本発明の実施の形態に係る熱交換システムの模式的系統図である。It is a schematic system diagram of the heat exchange system which concerns on embodiment of this invention. コイル内を流れる冷温水の流量と冷温水−空気間の交換熱量との関係を示すグラフである。It is a graph which shows the relationship between the flow rate of cold / hot water flowing in a coil, and the amount of exchange heat between cold / hot water-air. 二方弁の操作の状態を示すタイミング図である。It is a timing diagram which shows the operation state of a two-way valve. 本発明の実施の形態の変形例に係る熱交換システムの模式的系統図である。It is a schematic system diagram of the heat exchange system which concerns on the modification of embodiment of this invention.

以下、図面を参照して本発明の実施の形態について説明する。なお、各図において互いに同一又は相当する部材には同一あるいは類似の符号を付し、重複した説明は省略する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. In each figure, members that are the same as or correspond to each other are designated by the same or similar reference numerals, and duplicated description will be omitted.

まず図１を参照して、本発明の実施の形態に係る熱交換システム１を説明する。図１は、熱交換システム１の模式的系統図である。熱交換システム１は、本実施の形態では、コイル１５において冷温水ＣＨと空気ＳＡとの熱交換を行わせるシステムである。空気ＳＡは、冷房又は暖房（以下「冷暖房」という。）が行われる対象（典型的には冷暖房対象室）に供給される流体である。冷温水ＣＨは、冷水又は温水の総称で、典型的には対象の冷房が行われるときは冷水となり、暖房が行われるときは温水となる液体である。冷温水ＣＨは、空気ＳＡに熱を搬送する液体であり、熱搬送液体に相当する。空気ＳＡは、コイル１５において冷温水ＣＨによって温度が調節される対象であり、温度調節対象物に相当する。熱交換システム１は、上述のコイル１５の他、主流路を構成する主管１１と、二方弁１８と、副流路を構成する副管２１と、流量計２５と、制御装置５０とを備えている。 First, the heat exchange system 1 according to the embodiment of the present invention will be described with reference to FIG. FIG. 1 is a schematic system diagram of the heat exchange system 1. In the present embodiment, the heat exchange system 1 is a system in which the coil 15 exchanges heat between the hot and cold water CH and the air SA. The air SA is a fluid supplied to a target (typically, a heating / cooling target room) to be cooled or heated (hereinafter referred to as “cooling / heating”). The cold / hot water CH is a general term for cold water or hot water, and is typically a liquid that becomes cold water when the target is cooled and becomes hot water when heating is performed. The cold / hot water CH is a liquid that transfers heat to the air SA, and corresponds to a heat transfer liquid. The air SA is a target whose temperature is regulated by the hot / cold water CH in the coil 15, and corresponds to a temperature control target. In addition to the coil 15 described above, the heat exchange system 1 includes a main pipe 11 constituting the main flow path, a two-way valve 18, a sub pipe 21 constituting the sub flow path, a flow meter 25, and a control device 50. ing.

コイル１５は、上述のように冷温水ＣＨと空気ＳＡとで熱交換を行わせるものであり、熱交換部に相当する。コイル１５は、細長いチューブが多数配列され、これらのチューブ内を冷温水ＣＨが複数パスで流れるように、各チューブの上流端及び下流端のそれぞれにヘッダが設けられている。各チューブの外表面には複数のフィンが取り付けられている。コイル１５では、各チューブ内を冷温水ＣＨが流れ、各チューブの外側を空気ＳＡが流れることにより、冷温水ＣＨと空気ＳＡとで熱交換が行われるように構成されている。コイル１５は、本実施の形態では、最大で概ね１０００Ｌ／ｍｉｎの冷温水ＣＨを流すことができる大きさに構成されている。コイル１５は、チューブ内を流れる冷温水ＣＨの流量を変化させることにより、空気ＳＡに伝達する熱量を調節することができるようになっている。 As described above, the coil 15 exchanges heat between the hot and cold water CH and the air SA, and corresponds to a heat exchange unit. A large number of elongated tubes are arranged in the coil 15, and headers are provided at the upstream end and the downstream end of each tube so that the cold / hot water CH flows in these tubes in a plurality of passes. Multiple fins are attached to the outer surface of each tube. In the coil 15, the cold / hot water CH flows inside each tube, and the air SA flows outside each tube, so that heat exchange is performed between the cold / hot water CH and the air SA. In the present embodiment, the coil 15 is configured to have a size capable of flowing a cold / hot water CH of about 1000 L / min at the maximum. The coil 15 can adjust the amount of heat transferred to the air SA by changing the flow rate of the cold / hot water CH flowing in the tube.

図２は、コイル１５内を流れる冷温水ＣＨの流量と、冷温水ＣＨと空気ＳＡとの交換熱量と、の関係を示すグラフである。図２に示すグラフは、横軸に冷温水ＣＨの流量を、縦軸に冷温水ＣＨと空気ＳＡとの交換熱量をとっている。冷温水ＣＨと空気ＳＡとの交換熱量は冷温水ＣＨの流量に対して図２に示すような関係で比例しており、冷温水ＣＨの流量が比較的少ないときは冷温水ＣＨの流量の増加分に対する冷温水ＣＨと空気ＳＡとの交換熱量が増加する割合が大きいが、冷温水ＣＨの流量が比較的多くなると冷温水ＣＨの流量の増加分に対する冷温水ＣＨと空気ＳＡとの交換熱量が増加する割合が小さくなる。冷温水ＣＨの流量が増加すると、抵抗が増加し、冷温水ＣＨの搬送動力も増加することとなるため、効率を向上させる観点から、コイル１５に導入する冷温水ＣＨの定格流量（本実施の形態では、最大で概ね１０００Ｌ／ｍｉｎ）を、図２に示す流量Ｆｃ（以下「所定の流量Ｆｃ」という。）近辺にすることが好ましい。所定の流量Ｆｃは、典型的には、冷温水ＣＨの流量の増加分に対する冷温水ＣＨと空気ＳＡとの交換熱量の増加分の傾きが許容できる最低限となるときの冷温水ＣＨの流量である。 FIG. 2 is a graph showing the relationship between the flow rate of the cold / hot water CH flowing in the coil 15 and the amount of heat exchanged between the cold / hot water CH and the air SA. In the graph shown in FIG. 2, the horizontal axis represents the flow rate of the cold / hot water CH, and the vertical axis represents the amount of heat exchanged between the cold / hot water CH and the air SA. The amount of heat exchanged between the cold / hot water CH and the air SA is proportional to the flow rate of the cold / hot water CH in the relationship shown in FIG. 2, and when the flow rate of the cold / hot water CH is relatively small, the flow rate of the cold / hot water CH increases. The rate of increase in the amount of heat exchanged between the cold / hot water CH and the air SA is large with respect to the minute, but when the flow rate of the cold / hot water CH becomes relatively large, the amount of heat exchanged between the cold / hot water CH and the air SA with respect to the increase in the flow rate of the cold / hot water CH increases. The rate of increase becomes smaller. When the flow rate of the cold / hot water CH increases, the resistance increases and the transport power of the cold / hot water CH also increases. Therefore, from the viewpoint of improving efficiency, the rated flow rate of the cold / hot water CH to be introduced into the coil 15 (in this implementation). In the embodiment, it is preferable that the maximum flow rate Fc (up to approximately 1000 L / min) is in the vicinity of the flow rate Fc shown in FIG. 2 (hereinafter referred to as “predetermined flow rate Fc”). The predetermined flow rate Fc is typically the flow rate of the cold / hot water CH when the inclination of the increase in the amount of heat exchanged between the cold / hot water CH and the air SA with respect to the increase in the flow rate of the cold / hot water CH becomes an acceptable minimum. be.

再び図１に戻って熱交換システム１の構成の説明を続ける。主管１１は、主としてコイル１５に流す冷温水ＣＨを搬送する管である。主管１１は、コイル１５に供給される最大流量の冷温水ＣＨ（例えば概ね１０００Ｌ／ｍｉｎ）を流すことができる口径を有している。主管１１には、コイル１５が配設されている。また、主管１１には、副管２１が、コイル１５に対して並列になるように配置されて接続されている。つまり、副管２１は、一端がコイル１５よりも上流側の主管１１に接続され、他端がコイル１５よりも下流側の主管１１に接続されている。以下、説明の便宜上、コイル１５よりも上流側における主管１１と副管２１との接続点を「分岐点１１ｘ」といい、コイル１５よりも下流側における主管１１と副管２１との接続点を「合流点１１ｙ」という場合もある。また、説明の便宜上、分岐点１１ｘよりも上流側の主管１１を分岐前主管１１ｐとし、分岐点１１ｘと合流点１１ｙとの間の主管１１をコイル主管１１ｅとし、合流点１１ｙよりも下流側の主管１１を合流後主管１１ｑとして区別する場合もある。 Returning to FIG. 1 again, the description of the configuration of the heat exchange system 1 will be continued. The main pipe 11 is a pipe that mainly conveys the cold / hot water CH flowing through the coil 15. The main pipe 11 has a diameter capable of flowing the maximum flow rate of cold / hot water CH (for example, approximately 1000 L / min) supplied to the coil 15. A coil 15 is arranged on the main pipe 11. Further, the sub pipe 21 is arranged and connected to the main pipe 11 so as to be in parallel with the coil 15. That is, one end of the sub pipe 21 is connected to the main pipe 11 on the upstream side of the coil 15, and the other end is connected to the main pipe 11 on the downstream side of the coil 15. Hereinafter, for convenience of explanation, the connection point between the main pipe 11 and the sub pipe 21 on the upstream side of the coil 15 is referred to as a “branch point 11x”, and the connection point between the main pipe 11 and the sub pipe 21 on the downstream side of the coil 15 is referred to as a “branch point 11x”. It may be called "confluence point 11y". Further, for convenience of explanation, the main pipe 11 on the upstream side of the branch point 11x is the pre-branch main pipe 11p, the main pipe 11 between the branch point 11x and the confluence point 11y is the coil main pipe 11e, and the main pipe 11 on the downstream side of the confluence point 11y. In some cases, the main pipe 11 is distinguished as the main pipe 11q after merging.

二方弁１８は、主管１１を流れる冷温水ＣＨの流量を調節するものであり、流量調節部に相当する。二方弁１８は、本実施の形態では合流後主管１１ｑに配設されているが、分岐前主管１１ｐに配設されていてもよい。二方弁１８は、典型的には、電動アクチュエーターを有するグローブバルブ又はバタフライバルブであり、電力を入力しているときに開度を変化させ、電力の入力を停止したときにその時点の開度で保持する、フローティング動作を行う弁である。 The two-way valve 18 adjusts the flow rate of the cold / hot water CH flowing through the main pipe 11, and corresponds to the flow rate adjusting unit. Although the two-way valve 18 is arranged in the main pipe 11q after merging in the present embodiment, it may be arranged in the main pipe 11p before branching. The two-way valve 18 is typically a globe valve or butterfly valve having an electric actuator, which changes the opening degree when power is being input and is open at that time when power input is stopped. It is a valve that performs a floating operation and is held by.

副管２１は、本実施の形態では、前述のように、両端がそれぞれ分岐点１１ｘ及び合流点１１ｙに接続され、コイル１５に対して並列に配置されている。副管２１は、コイル主管１１ｅよりも小さい口径（流路断面積）を有する管であり、本実施の形態では概ね３Ｌ／ｍｉｎ程度の冷温水ＣＨを流すのに適切な口径を有している。本実施の形態では、副管２１の一部区間が第１副管２１ｆと第２副管２１ｓとに分かれている。第１副管２１ｆと第２副管２１ｓとは、並列に接続されている。第１副管２１ｆには、第１抵抗２８ｆと、第１仕切弁２９ｆとが配設されている。第１抵抗２８ｆは、副管２１全体を流れる冷温水ＣＨの流量が、コイル主管１１ｅを流れる冷温水ＣＨの流量の変化に応じて変化するように設けられた抵抗である。つまり、第１副管２１ｆを流れる冷温水ＣＨの流量は、コイル主管１１ｅを流れる冷温水ＣＨの流量に対して所定の比率となるように構成されている。第２副管２１ｓには、第２抵抗２８ｓと、第２仕切弁２９ｓとが配設されている。第２抵抗２８ｓは、第１抵抗２８ｆよりも抵抗値が小さい抵抗であり、コイル主管１１ｅを流れる冷温水ＣＨの流量が比較的少ないときに、副管２１全体を流れる冷温水ＣＨの流量が、コイル主管１１ｅを流れる冷温水ＣＨの流量に対して所定の比率となるようにするものである。第１仕切弁２９ｆ及び第２仕切弁２９ｓは、一方を開にして他方を閉にすることにより、冷温水ＣＨが第１副管２１ｆを流れるのと第２副管２１ｓを流れるのとを切り換えることができ、切換部を構成する。また、第１抵抗２８ｆが配設された第１副管２１ｆは第１の抵抗流路に相当し、第２抵抗２８ｓが配設された第２副管２１ｓは第２の抵抗流路に相当する。第１副管２１ｆと第２副管２１ｓとに分流していない副管２１には、流量計２５が配設されている。 In the present embodiment, as described above, both ends of the auxiliary pipe 21 are connected to the branch point 11x and the confluence point 11y, respectively, and are arranged in parallel with the coil 15. The auxiliary pipe 21 is a pipe having a diameter (flow path cross-sectional area) smaller than that of the coil main pipe 11e, and in the present embodiment, it has an appropriate diameter for flowing cold / hot water CH of about 3 L / min. .. In the present embodiment, a part of the sub pipe 21 is divided into a first sub pipe 21f and a second sub pipe 21s. The first sub-tube 21f and the second sub-tube 21s are connected in parallel. The first auxiliary pipe 21f is provided with a first resistor 28f and a first sluice valve 29f. The first resistor 28f is a resistor provided so that the flow rate of the cold / hot water CH flowing through the entire auxiliary pipe 21 changes according to the change in the flow rate of the cold / hot water CH flowing through the coil main pipe 11e. That is, the flow rate of the cold / hot water CH flowing through the first auxiliary pipe 21f is configured to be a predetermined ratio with the flow rate of the cold / hot water CH flowing through the coil main pipe 11e. A second resistor 28s and a second sluice valve 29s are arranged in the second auxiliary pipe 21s. The second resistance 28s is a resistor having a smaller resistance value than the first resistance 28f, and when the flow rate of the cold / hot water CH flowing through the coil main pipe 11e is relatively small, the flow rate of the cold / hot water CH flowing through the entire auxiliary pipe 21 is increased. The ratio is set to a predetermined ratio with respect to the flow rate of the cold / hot water CH flowing through the coil main pipe 11e. The first sluice valve 29f and the second sluice valve 29s switch between the cold / hot water CH flowing through the first auxiliary pipe 21f and the second auxiliary pipe 21s by opening one and closing the other. It can form a switching unit. Further, the first sub-tube 21f in which the first resistance 28f is arranged corresponds to the first resistance flow path, and the second sub-tube 21s in which the second resistance 28s is arranged corresponds to the second resistance flow path. do. A flow meter 25 is arranged in the auxiliary pipe 21 which is not divided into the first auxiliary pipe 21f and the second auxiliary pipe 21s.

流量計２５は、副管２１全体を流れる冷温水ＣＨの流量を計測するものである。したがって、流量計２５は、コイル主管１１ｅを流れる冷温水ＣＨの流量を計測するような大規模なものを必要とせず、副管２１を流れる程度の小流量を計測可能なもので足りる。したがって、コイル主管１１ｅを流れる冷温水ＣＨの流量を計測するものに比べて大幅なコンパクト化を図ることができ、コストダウンにも寄与する。なお、仮に極めて小流量を計測する流量計を採用した場合は、繊細複雑な構造のものとなり、かえってコストアップを招来するおそれがあるため、入手しやすい流量計２５を選定し、選定した流量計２５に適した流量の冷温水ＣＨが副管２１を流れるように、副管２１の口径を決定するとよい。前述のように、副管２１を流れる冷温水ＣＨの流量は、コイル主管１１ｅを流れる冷温水ＣＨの流量に対して所定の比率となるので、副管２１を流れる冷温水ＣＨの実流量を流量計２５で計測することで、冷温水ＣＨの温度や圧力等が変化した場合であっても、コイル主管１１ｅを流れる冷温水ＣＨの流量を比較的正確に把握することができる。流量計２５は、本実施の形態ではパルスを出力可能なパドル式流量計（羽根車式流量計）が用いられているが、パドル式流量計以外の流量計が用いられてもよい。 The flow meter 25 measures the flow rate of the cold / hot water CH flowing through the entire auxiliary pipe 21. Therefore, the flow meter 25 does not require a large-scale flow meter such as measuring the flow rate of the cold / hot water CH flowing through the coil main pipe 11e, and can measure a small flow rate such as flowing through the auxiliary pipe 21. Therefore, the size can be significantly reduced as compared with the one that measures the flow rate of the cold / hot water CH flowing through the coil main pipe 11e, which also contributes to cost reduction. If a flow meter that measures extremely small flow rates is adopted, it will have a delicate and complicated structure, which may lead to cost increase. Therefore, select an easily available flow meter 25 and select the flow meter. It is advisable to determine the diameter of the sub-pipe 21 so that the cold / hot water CH having a flow rate suitable for 25 flows through the sub-pipe 21. As described above, the flow rate of the cold / hot water CH flowing through the auxiliary pipe 21 is a predetermined ratio to the flow rate of the cold / hot water CH flowing through the coil main pipe 11e, so that the actual flow rate of the cold / hot water CH flowing through the auxiliary pipe 21 is used. By measuring with a total of 25, even if the temperature, pressure, or the like of the cold / hot water CH changes, the flow rate of the cold / hot water CH flowing through the coil main pipe 11e can be grasped relatively accurately. As the flow meter 25, a paddle type flow meter (impeller type flow meter) capable of outputting a pulse is used in the present embodiment, but a flow meter other than the paddle type flow meter may be used.

熱交換システム１は、上述の構成のほか、コイル１５から流出した空気ＳＡの温度を検出する温度計３５が設けられている。温度計３５は、温度調節対象物である空気ＳＡの温度を検出するものであり、温度検出器に相当する。 In addition to the above configuration, the heat exchange system 1 is provided with a thermometer 35 that detects the temperature of the air SA flowing out of the coil 15. The thermometer 35 detects the temperature of the air SA, which is the object of temperature control, and corresponds to a temperature detector.

制御装置５０は、熱交換システム１の動作を制御する装置である。制御装置５０は、二方弁１８と有線又は無線で電気的に接続されており、二方弁１８の開度を調節することができるように構成されている。また、制御装置５０は、流量計２５と有線又は無線で電気的に接続されており、流量計２５で計測した流量を信号として受信することができるように構成されている。また、制御装置５０は、流量計２５で計測した流量に基づいてコイル主管１１ｅを流れる冷温水ＣＨの流量を求めることができるように構成されている。典型的には、コイル主管１１ｅ及び副管２１のそれぞれを流れる冷温水ＣＨの流量の関係がテーブルに記憶され、流量計２５で検出された流量を記憶されているテーブルに照らしてコイル主管１１ｅを流れる冷温水ＣＨの流量を求めることができるように構成されているが、テーブルで表された関係が計算式として記憶されていて流量計２５で検出された流量を当該計算式に当てはめることでコイル主管１１ｅを流れる冷温水ＣＨの流量を求めることとしてもよい。また、制御装置５０は、第１仕切弁２９ｆ及び第２仕切弁２９ｓのそれぞれと有線又は無線で電気的に接続されており、各弁２９ｆ、２９ｓの開閉を切り換えることができるように構成されている。また、制御装置５０は、温度計３５と有線又は無線で電気的に接続されており、温度計３５で検出した温度を信号として受信することができるように構成されている。また、制御装置５０は、図２に示すコイル１５における冷温水ＣＨの流量と冷温水ＣＨ−空気ＳＡ間の交換熱量との関係が記憶されており、所定の流量Ｆｃを把握することができるように構成されている。 The control device 50 is a device that controls the operation of the heat exchange system 1. The control device 50 is electrically connected to the two-way valve 18 by wire or wirelessly, and is configured to be able to adjust the opening degree of the two-way valve 18. Further, the control device 50 is electrically connected to the flow meter 25 by wire or wirelessly, and is configured to be able to receive the flow rate measured by the flow meter 25 as a signal. Further, the control device 50 is configured to be able to obtain the flow rate of the cold / hot water CH flowing through the coil main pipe 11e based on the flow rate measured by the flow meter 25. Typically, the relationship between the flow rates of the hot and cold water channels flowing through the coil main pipe 11e and the sub pipe 21 is stored in a table, and the flow rate detected by the flow meter 25 is stored in the table to store the coil main pipe 11e. It is configured so that the flow rate of the flowing cold / hot water CH can be obtained, but the relationship expressed in the table is stored as a calculation formula, and the flow rate detected by the flow meter 25 is applied to the calculation formula to coil. The flow rate of the cold / hot water CH flowing through the main pipe 11e may be obtained. Further, the control device 50 is electrically connected to each of the first sluice valve 29f and the second sluice valve 29s by wire or wirelessly, and is configured to be able to switch between opening and closing of the respective valves 29f and 29s. There is. Further, the control device 50 is electrically connected to the thermometer 35 by wire or wirelessly, and is configured to be able to receive the temperature detected by the thermometer 35 as a signal. Further, the control device 50 stores the relationship between the flow rate of the cold / hot water CH in the coil 15 shown in FIG. 2 and the exchange heat amount between the cold / hot water CH and the air SA, so that the predetermined flow rate Fc can be grasped. It is configured in.

上述の、熱交換システム１を構成する各要素は、１つの筐体に収容されていてもよく（例えばエアハンドリングユニット内に組み込まれている）、例えば制御装置５０が筐体の外に設けられるように一部が筐体の外側に設けられていてもよく、ユニット化されずにすべてが露出して組み立てられていてもよい。 Each element constituting the heat exchange system 1 described above may be housed in one housing (for example, incorporated in an air handling unit), for example, a control device 50 is provided outside the housing. A part of the housing may be provided on the outside of the housing, or the whole may be exposed and assembled without being unitized.

引き続き図１を参照して、熱交換システム１の作用を説明する。熱交換システム１が起動すると、ファン（不図示）によって空気ＳＡが圧送され、コイル１５を通過するように空気ＳＡが流れる。他方、冷温水ＣＨが、熱源機（不図示）で温度が調節された後に冷温水ポンプ（不図示）によって圧送され、分岐前主管１１ｐを流れてくる。分岐前主管１１ｐを流れてきた冷温水ＣＨは、コイル主管１１ｅと副管２１とに分流し、それぞれの流路を流れる。コイル主管１１ｅを流れる冷温水ＣＨは、コイル１５を流れる際に空気ＳＡと熱交換が行われる。コイル１５において、冷温水ＣＨと空気ＳＡとの間で熱交換が行われることにより、空気ＳＡの温度は冷温水ＣＨの温度に近づき、冷温水ＣＨの温度は空気ＳＡの温度に近づく。コイル１５を通過した冷温水ＣＨは、コイル主管１１ｅを流れて合流点１１ｙに至る。 Subsequently, with reference to FIG. 1, the operation of the heat exchange system 1 will be described. When the heat exchange system 1 is activated, the air SA is pumped by a fan (not shown), and the air SA flows so as to pass through the coil 15. On the other hand, the cold / hot water CH is pumped by a cold / hot water pump (not shown) after the temperature is adjusted by a heat source machine (not shown), and flows through the main pipe 11p before branching. The cold / hot water CH that has flowed through the main pipe 11p before branching is divided into the coil main pipe 11e and the sub pipe 21 and flows through the respective flow paths. The cold / hot water CH flowing through the coil main pipe 11e exchanges heat with the air SA when flowing through the coil 15. In the coil 15, heat exchange is performed between the cold / hot water CH and the air SA, so that the temperature of the air SA approaches the temperature of the cold / hot water CH, and the temperature of the cold / hot water CH approaches the temperature of the air SA. The cold / hot water CH that has passed through the coil 15 flows through the coil main pipe 11e and reaches the confluence point 11y.

副管２１では、通常、第１仕切弁２９ｆが開かつ第２仕切弁２９ｓが閉となっている。したがって、通常、副管２１に流入した冷温水ＣＨは、第１抵抗２８ｆを通過し、流量計２５を通過する。流量計２５は、冷温水ＣＨが通過した際に計測した流量を信号として制御装置５０に送信する。第１抵抗２８ｆ及び流量計２５を通過した冷温水ＣＨは、副管２１を流れて合流点１１ｙに至る。合流点１１ｙでは、コイル主管１１ｅを流れてきた冷温水ＣＨと副管２１を流れてきた冷温水ＣＨとが合流する。合流点１１ｙで合流した冷温水ＣＨは、合流後主管１１ｑを流れて熱源機（不図示）に導かれ、熱源機（不図示）で温度が調節された後に再び分岐前主管１１ｐに供給される。 In the auxiliary pipe 21, the first sluice valve 29f is normally open and the second sluice valve 29s is closed. Therefore, normally, the cold / hot water CH that has flowed into the auxiliary pipe 21 passes through the first resistor 28f and passes through the flow meter 25. The flow meter 25 transmits the flow rate measured when the cold / hot water CH passes to the control device 50 as a signal. The cold / hot water CH that has passed through the first resistor 28f and the flow meter 25 flows through the auxiliary pipe 21 and reaches the confluence point 11y. At the confluence point 11y, the cold / hot water CH flowing through the coil main pipe 11e and the cold / hot water CH flowing through the sub pipe 21 merge. The cold / hot water CH merged at the merging point 11y flows through the main pipe 11q after merging and is guided to a heat source machine (not shown), and after the temperature is adjusted by the heat source machine (not shown), it is supplied to the main pipe 11p before branching again. ..

他方、コイル１５を通過した空気ＳＡは、温度計３５で温度が検出される。温度計３５は、検出した温度を信号として制御装置５０に送信する。制御装置５０は、温度計３５が検出した温度があらかじめ設定された温度となるように、二方弁１８の開度を調節する。ここで、あらかじめ設定された温度は、典型的には冷暖房対象室に供給される空気ＳＡの温度として適した温度である。二方弁１８の開度を調節するのに際し、冷温水ＣＨの流量を過剰に流すと、図２に示されるように空気ＳＡと冷温水ＣＨとの熱交換効率が低下することとなり、これに加えて搬送動力も増加するので、冷温水ＣＨの流量が所定の流量Ｆｃ以下となる範囲で二方弁１８の開度を調節することが好ましい。本実施の形態では、制御装置５０は、流量計２５で計測された流量を、あらかじめ記憶されている流量計２５での計測値とコイル主管１１ｅを流れる流量との関係に照らし、コイル主管１１ｅを流れる冷温水ＣＨの流量を求めている。このとき求められるコイル主管１１ｅを流れる冷温水ＣＨの流量は、流量計２５で計測された実際の流量に基づいているため、冷温水ＣＨの温度変化や背圧の変化等の外部要因にかかわらず誤差が小さい比較的正確な流量となる。そして、制御装置５０は、求めたコイル主管１１ｅを流れる冷温水ＣＨの流量が所定の流量Ｆｃ以下となる範囲で二方弁１８の開度を調節することとして、実際に冷温水ＣＨが過剰に流れることを防いでいる。 On the other hand, the temperature of the air SA that has passed through the coil 15 is detected by the thermometer 35. The thermometer 35 transmits the detected temperature as a signal to the control device 50. The control device 50 adjusts the opening degree of the two-way valve 18 so that the temperature detected by the thermometer 35 becomes a preset temperature. Here, the preset temperature is typically a temperature suitable as the temperature of the air SA supplied to the heating / cooling target room. If the flow rate of the cold / hot water CH is excessively flowed when adjusting the opening degree of the two-way valve 18, the heat exchange efficiency between the air SA and the cold / hot water CH decreases as shown in FIG. In addition, since the transport power also increases, it is preferable to adjust the opening degree of the two-way valve 18 within a range in which the flow rate of the cold / hot water CH is equal to or less than the predetermined flow rate Fc. In the present embodiment, the control device 50 compares the flow rate measured by the flow meter 25 with the relationship between the measured value of the flow meter 25 stored in advance and the flow rate flowing through the coil main pipe 11e, and sets the coil main pipe 11e. The flow rate of the flowing cold / hot water CH is obtained. Since the flow rate of the cold / hot water CH flowing through the coil main pipe 11e obtained at this time is based on the actual flow rate measured by the flow meter 25, regardless of external factors such as temperature change and back pressure change of the cold / hot water CH. The flow rate is relatively accurate with a small error. Then, the control device 50 adjusts the opening degree of the two-way valve 18 within a range in which the flow rate of the cold / hot water CH flowing through the obtained coil main pipe 11e is equal to or less than the predetermined flow rate Fc, so that the cold / hot water CH actually becomes excessive. It prevents it from flowing.

制御装置５０は、上述の制御中、コイル主管１１ｅを流れる流量が所定の流量Ｆｃを超えそうな場合は、温度計３５で検出すべきあらかじめ設定された温度から離れる方向に、すなわち冷温水ＣＨの温度とあらかじめ設定された温度との差が大きくなる方向に、熱源機（不図示）において冷温水ＣＨの温度を調節してもよい。冷温水ＣＨの温度とあらかじめ設定された温度との差が大きくなると、冷温水ＣＨの単位流量あたりの空気ＳＡとの交換熱量が増大するため、冷温水ＣＨの流量を少なくすることができる。また、制御装置５０は、温度計３５が検出した温度とあらかじめ設定された温度との差に応じて、二方弁１８の制御を以下のように変化させるとよい。 During the above control, when the flow rate flowing through the coil main pipe 11e is likely to exceed a predetermined flow rate Fc, the control device 50 moves away from the preset temperature to be detected by the thermometer 35, that is, the cold / hot water CH. The temperature of the cold / hot water CH may be adjusted in a heat source machine (not shown) in a direction in which the difference between the temperature and the preset temperature becomes large. When the difference between the temperature of the cold / hot water CH and the preset temperature becomes large, the amount of heat exchanged with the air SA per unit flow rate of the cold / hot water CH increases, so that the flow rate of the cold / hot water CH can be reduced. Further, the control device 50 may change the control of the two-way valve 18 as follows according to the difference between the temperature detected by the thermometer 35 and the preset temperature.

図３は、時間経過に沿った二方弁１８の操作の状態を示すタイミング図である。図３（Ａ）に示すように、二方弁１８は、標準状態において、操作と停止とを決められた周期Ｙで繰り返している。ここで、「操作」は、二方弁１８の開度を調節可能な状態であり、必要に応じて開度調節用のモータに電力を供給することができる状態である。実際に二方弁１８の開度が変更されるか否かは、温度計３５で検出された温度とあらかじめ設定された温度との差の有無により、差がない場合は開度が変更されず、差がある場合は差の大きさに応じて開度が変更される（典型的には比例制御が行われる）。他方、図３（Ａ）に示す二方弁１８の状態の「停止」は、二方弁１８に電力の供給が行われず、開度の調節が行われることがない状態である。「停止」の状態を設けているのは、「操作」において行われた二方弁１８の開度調節の効果が、温度計３５で検出された温度に現れるまでに時間を要することを考慮したものである。したがって、二方弁１８を停止状態にする時間（以下「停止時間Ｙｓ」という。）は、二方弁１８の開度調節を行ってからその効果が温度計３５で検出された温度に現れるまでの時間に基づいて決定するとよい。二方弁１８の開度調節は、二方弁１８を操作状態にする時間（以下「操作時間Ｙｍ」という。）と停止時間Ｙｓとの合計を１つの周期Ｙとして、これを繰り返すことで行われている。ここで、操作時間Ｙｍを決定するにあたり、操作時間Ｙｍを長くすると二方弁１８の開度調節が行き過ぎてハンチングが生じるおそれがあり、操作時間Ｙｍを短くすると温度計３５で検出された温度とあらかじめ設定された温度との差が大きい場合に温度計３５で検出された温度が設定温度になるまでに相当の時間を要することになる。そこで、本実施の形態では、図３（Ｂ）に示すように、温度計３５で検出された温度とあらかじめ設定された温度との差が大きい場合は周期Ｙ１のように長めの操作時間Ｙｍ１を取り、差が小さい場合は周期Ｙ３のように短めの操作時間Ｙｍ３を取り、差が両者の間の場合は周期Ｙ２のように中間長さの操作時間Ｙｍ２を取ることとしている。このような制御とすることで、温度計３５で検出された温度とあらかじめ設定された温度との差が大きい場合は二方弁１８の出力範囲（本実施の形態では操作時間Ｙｍ）を大きくして空気ＳＡの温度を迅速に設定温度に近づけ、差が小さい場合は二方弁１８の出力範囲を小さくしてハンチングを防ぐことができる。なお、二方弁１８の出力範囲は、操作時間Ｙｍの他、開度を変更するモータの回転速度等であってもよい。 FIG. 3 is a timing diagram showing a state of operation of the two-way valve 18 over time. As shown in FIG. 3A, the two-way valve 18 repeats operation and stop in a predetermined period Y in a standard state. Here, the "operation" is a state in which the opening degree of the two-way valve 18 can be adjusted, and power can be supplied to the motor for adjusting the opening degree as needed. Whether or not the opening degree of the two-way valve 18 is actually changed depends on whether or not there is a difference between the temperature detected by the thermometer 35 and the preset temperature. If there is no difference, the opening degree is not changed. If there is a difference, the opening is changed according to the magnitude of the difference (typically, proportional control is performed). On the other hand, the "stop" state of the two-way valve 18 shown in FIG. 3A is a state in which electric power is not supplied to the two-way valve 18 and the opening degree is not adjusted. The "stop" state is provided in consideration of the fact that it takes time for the effect of the opening adjustment of the two-way valve 18 performed in the "operation" to appear at the temperature detected by the thermometer 35. It is a thing. Therefore, the time for stopping the two-way valve 18 (hereinafter referred to as “stop time Ys”) is from the time when the opening degree of the two-way valve 18 is adjusted until the effect appears at the temperature detected by the thermometer 35. It should be decided based on the time of. The opening degree of the two-way valve 18 is adjusted by repeating this with the total of the time for operating the two-way valve 18 (hereinafter referred to as "operation time Ym") and the stop time Ys as one cycle Y. It has been. Here, in determining the operation time Ym, if the operation time Ym is lengthened, the opening degree of the two-way valve 18 may be adjusted excessively and hunting may occur. When the difference from the preset temperature is large, it takes a considerable amount of time for the temperature detected by the thermometer 35 to reach the set temperature. Therefore, in the present embodiment, as shown in FIG. 3B, when the difference between the temperature detected by the thermometer 35 and the preset temperature is large, a longer operation time Ym1 such as a cycle Y1 is set. If the difference is small, a short operation time Ym3 is taken as in the cycle Y3, and if the difference is between the two, an intermediate length operation time Ym2 is taken as in the cycle Y2. With such control, if the difference between the temperature detected by the thermometer 35 and the preset temperature is large, the output range of the two-way valve 18 (operation time Ym in this embodiment) is increased. The temperature of the air SA can be quickly brought close to the set temperature, and if the difference is small, the output range of the two-way valve 18 can be reduced to prevent hunting. The output range of the two-way valve 18 may be the operation time Ym, the rotation speed of the motor for changing the opening degree, or the like.

再び図１に戻って熱交換システム１の作用の説明を続ける。熱交換システム１の運転中で、温度計３５が検出した温度があらかじめ設定された温度となるように二方弁１８の開度を調節している最中に、求めたコイル主管１１ｅを流れる冷温水ＣＨの流量があらかじめ決められた流量よりも少なくなると、第１副管２１ｆを流れる冷温水ＣＨの特性に変化が生じ、コイル主管１１ｅを流れる冷温水ＣＨの流量と副管２１を流れる冷温水ＣＨの流量との比率が所定の比率からずれるおそれがある。制御装置５０は、コイル主管１１ｅを流れる冷温水ＣＨの流量があらかじめ決められた流量よりも少なくなった場合、第２仕切弁２９ｓを開かつ第１仕切弁２９ｆを閉にするように切り換える。すると、分岐点１１ｘから副管２１に流入した冷温水ＣＨは、第２抵抗２８ｓを通過し、流量計２５を通過して、合流点１１ｙに至るようになる。第２抵抗２８ｓは、冷温水ＣＨの流量が小流量のときに、コイル主管１１ｅを流れる冷温水ＣＨの流量と副管２１を流れる冷温水ＣＨの流量との比率が所定の比率となるように選定されているので、流量計２５で計測された実流量に基づいて求めたコイル主管１１ｅを流れる冷温水ＣＨの流量の、実際の流量との誤差が小さくなる。このように、冷温水ＣＨの流量に応じて、副管２１に流入した冷温水ＣＨが第１抵抗２８ｆを流れるのと第２抵抗２８ｓを流れるのとを切り換えることで、対応できる冷温水ＣＨの最大流量と最小流量との差を拡大することができ、レンジアビリティを広げることができる。制御装置５０は、コイル主管１１ｅを流れる冷温水ＣＨの流量が、あらかじめ決められた流量以上になると第１仕切弁２９ｆを開かつ第２仕切弁２９ｓを閉にし、あらかじめ決められた流量よりも少なくなると第２仕切弁２９ｓを開かつ第１仕切弁２９ｆを閉にするように、第１仕切弁２９ｆ及び第２仕切弁２９ｓの開閉を適宜切り換える。このようにして、冷暖房対象室に、適切に温度が調節された空気ＳＡが供給される。 Returning to FIG. 1 again, the description of the operation of the heat exchange system 1 will be continued. During the operation of the heat exchange system 1, while adjusting the opening degree of the two-way valve 18 so that the temperature detected by the thermometer 35 becomes a preset temperature, the cold temperature flowing through the obtained coil main pipe 11e When the flow rate of the water CH becomes smaller than the predetermined flow rate, the characteristics of the cold / hot water CH flowing through the first auxiliary pipe 21f change, and the flow rate of the cold / hot water CH flowing through the coil main pipe 11e and the cold / hot water flowing through the auxiliary pipe 21 The ratio with the flow rate of CH may deviate from the predetermined ratio. When the flow rate of the cold / hot water CH flowing through the coil main pipe 11e becomes smaller than the predetermined flow rate, the control device 50 switches to open the second sluice valve 29s and close the first sluice valve 29f. Then, the cold / hot water CH flowing into the auxiliary pipe 21 from the branch point 11x passes through the second resistor 28s, passes through the flow meter 25, and reaches the confluence point 11y. The second resistance 28s has a predetermined ratio between the flow rate of the cold / hot water CH flowing through the coil main pipe 11e and the flow rate of the cold / hot water CH flowing through the auxiliary pipe 21 when the flow rate of the cold / hot water CH is small. Since it is selected, the error between the flow rate of the cold / hot water CH flowing through the coil main pipe 11e obtained based on the actual flow rate measured by the flow meter 25 and the actual flow rate becomes small. In this way, the cold / hot water CH that has flowed into the auxiliary pipe 21 can be switched between flowing through the first resistance 28f and flowing through the second resistance 28s according to the flow rate of the cold / hot water CH. The difference between the maximum flow rate and the minimum flow rate can be widened, and the rangeability can be expanded. When the flow rate of the cold / hot water CH flowing through the coil main pipe 11e becomes equal to or higher than the predetermined flow rate, the control device 50 opens the first sluice valve 29f and closes the second sluice valve 29s, and the flow rate is less than the predetermined flow rate. Then, the opening and closing of the first sluice valve 29f and the second sluice valve 29s are appropriately switched so as to open the second sluice valve 29s and close the first sluice valve 29f. In this way, the air SA whose temperature is appropriately adjusted is supplied to the heating / cooling target room.

以上で説明したように、本実施の形態に係る熱交換システム１によれば、コイル主管１１ｅよりも口径の小さい副管２１をコイル主管１１ｅに対して並列に設け、副管２１に配置した流量計２５で実測した流量に基づいてコイル主管１１ｅを流れる冷温水ＣＨの流量を求め、求めた冷温水ＣＨの流量に照らして効率の低下が許容される範囲内で二方弁１８の開度を調節しているので、二方弁１８の流量係数（Ｃｖ値）や種類（グローブバルブやバタフライバルブ等）を意識することなく、冷温水ＣＨの温度や圧力等の変化の外部要因にかかわらず、適切に空気ＳＡの温度を設定値に制御することができる。また、冷温水ＣＨの流量変化に応じて、副管２１の抵抗を切り換えるので、レンジアビリティを広げることができる。また、温度計３５で検出された温度とあらかじめ設定された温度との差に応じて二方弁１８の出力範囲を変化させるので、空気ＳＡの温度を迅速に設定温度に近づけつつハンチングを防ぐことができる。 As described above, according to the heat exchange system 1 according to the present embodiment, the auxiliary pipe 21 having a diameter smaller than that of the coil main pipe 11e is provided in parallel with the coil main pipe 11e, and the flow rate is arranged in the auxiliary pipe 21. The flow rate of the cold / hot water CH flowing through the coil main pipe 11e is obtained based on the flow rate actually measured by the total 25, and the opening degree of the two-way valve 18 is adjusted within the range where the decrease in efficiency is allowed in light of the obtained flow rate of the cold / hot water CH. Since it is adjusted, regardless of external factors such as changes in the temperature and pressure of the hot and cold water CH, without being aware of the flow coefficient (Cv value) and type (glove valve, butterfly valve, etc.) of the two-way valve 18. The temperature of the air SA can be appropriately controlled to the set value. Further, since the resistance of the auxiliary pipe 21 is switched according to the change in the flow rate of the cold / hot water CH, the rangeability can be expanded. Further, since the output range of the two-way valve 18 is changed according to the difference between the temperature detected by the thermometer 35 and the preset temperature, hunting is prevented while the temperature of the air SA is quickly brought close to the set temperature. Can be done.

以上の説明では、熱搬送液体が冷温水ＣＨであるとしたが、不凍液等の冷温水ＣＨ以外の液体であってもよい。また、温度調節対象物が空気ＳＡであるとしたが、空気ＳＡ以外のガスや液体等、用途に応じて適宜変更することができる。 In the above description, the heat transfer liquid is the cold / hot water CH, but it may be a liquid other than the cold / hot water CH such as antifreeze. Further, although it is assumed that the object to be temperature controlled is air SA, it can be appropriately changed depending on the application such as gas or liquid other than air SA.

以上の説明では、副管２１の一部が第１副管２１ｆと第２副管２１ｓとに分流してそれぞれに異なる抵抗値の抵抗２８ｆ、２８ｓが配設されているとしたが、分流させずに単一の流路に１つの抵抗を配設してもよい。しかしながら、それぞれに異なる抵抗値の抵抗２８ｆ、２８ｓが配設された第１副管２１ｆと第２副管２１ｓとに分流して、冷温水ＣＨの流量に応じて通過させる副管２１ｆ、２１ｓを選択することとすると、レンジアビリティを広げることができて好ましい。なお、副管２１の一部の冷温水ＣＨの流路を第１副管２１ｆと第２副管２１ｓとで切り換える場合は、２つの仕切弁２９ｆ、２９ｓに代えて、第１副管２１ｆと第２副管２１ｓとの分岐部又は合流部に三方弁を設けてもよい。あるいは、図１に示すように、第１副管２１ｆに第１仕切弁２９ｆ弁を、第２副管２１ｓに第２仕切弁２９ｓをそれぞれ配置した場合に、冷温水ＣＨが第１副管２１ｆと第２副管２１ｓとを選択的に流れるようにする他に、第１副管２１ｆ及び第２副管２１ｓの両方を流れるように３段階の選択を可能にして、さらにレンジアビリティを広げることとしてもよい。 In the above description, it is assumed that a part of the auxiliary pipe 21 is divided into the first auxiliary pipe 21f and the second auxiliary pipe 21s, and the resistors 28f and 28s having different resistance values are arranged in the respective auxiliary pipes 21s. Instead, one resistor may be arranged in a single flow path. However, the auxiliary pipes 21f and 21s which are divided into the first auxiliary pipe 21f and the second auxiliary pipe 21s in which the resistors 28f and 28s having different resistance values are arranged and passed according to the flow rate of the hot and cold water CH are passed. It is preferable to select it because it can expand the rangeability. When switching the flow path of a part of the cold / hot water CH of the auxiliary pipe 21 between the first auxiliary pipe 21f and the second auxiliary pipe 21s, the first auxiliary pipe 21f is used instead of the two sluice valves 29f and 29s. A three-way valve may be provided at the branching portion or the merging portion with the second auxiliary pipe 21s. Alternatively, as shown in FIG. 1, when the first sluice valve 29f valve is arranged in the first sub-pipe 21f and the second sluice valve 29s is arranged in the second sub-pipe 21s, the cold / hot water CH becomes the first sub-pipe 21f. In addition to selectively flowing the first sub-tube and the second sub-tube 21s, it is possible to select three stages so that both the first sub-tube 21f and the second sub-tube 21s flow, further expanding the rangeability. May be.

以上の説明では、温度検出器が、コイル１５通過後の空気ＳＡの温度を検出する温度計３５であるとしたが、空気ＳＡの温度と相関を有するものの温度を検出するものであってもよい。空気ＳＡの温度と相関を有するものとして、例えば、空気ＳＡが供給される冷暖房対象室の内部温度や、冷温水ＣＨのコイル１５出口の温度あるいはコイル１５出入口の温度差等を挙げることができる。 In the above description, the temperature detector is a thermometer 35 that detects the temperature of the air SA after passing through the coil 15, but it may be one that detects the temperature of the one that has a correlation with the temperature of the air SA. .. Examples of those having a correlation with the temperature of the air SA include the internal temperature of the heating / cooling target room to which the air SA is supplied, the temperature of the coil 15 outlet of the cold / hot water CH, the temperature difference of the coil 15 inlet / outlet, and the like.

以上の説明では、副管２１がコイル１５に対して並列に配置されていることとしたが、図４に示すようにコイル１５が配置されていない主管１１の部分に対して副管２１が並列に配置されていてもよい。この場合、副管２１に配設された流量計２５を冷温水ＣＨが通過するのに必要な差圧を、副管２１に対して並列となる主管１１の部分に生じさせるために、当該主管１１の部分に流量計２５の抵抗に相当する抵抗を設けることとなるため、主管１１全体としてみるとコイル１５に加えて抵抗が増えることとなる。この抵抗の増加に伴うエネルギーの浪費を削減する観点からは、図１に示すように副管２１がコイル１５に対して並列に配置されていることが好ましい。 In the above description, it is assumed that the sub pipe 21 is arranged in parallel with the coil 15, but as shown in FIG. 4, the sub pipe 21 is in parallel with the portion of the main pipe 11 in which the coil 15 is not arranged. It may be arranged in. In this case, in order to generate the differential pressure required for the cold / hot water CH to pass through the flow meter 25 arranged in the sub pipe 21 in the portion of the main pipe 11 parallel to the sub pipe 21, the main pipe is concerned. Since a resistor corresponding to the resistance of the flow meter 25 is provided in the portion of 11, the resistance of the main pipe 11 as a whole increases in addition to the coil 15. From the viewpoint of reducing the waste of energy due to the increase in resistance, it is preferable that the auxiliary pipe 21 is arranged in parallel with the coil 15 as shown in FIG.

１熱交換システム
１１主管
１１ｅコイル主管
１１ｐ分岐前主管
１１ｑ合流後主管
１１ｙ合流点
１１ｘ分岐点
１５コイル
１８二方弁
２１副管
２１ｆ第１副管
２１ｓ第２副管
２５流量計
２９切換部
３５温度計
５０制御装置
ＣＨ冷温水
ＳＡ空気 1 Heat exchange system 11 Main pipe 11e Coil main pipe 11p Before branching Main pipe 11q After merging Main pipe 11y Confluence point 11x Branching point 15 Coil 18 Two-way valve 21 Sub pipe 21f First sub pipe 21s Second sub pipe 25 Flow meter 29 Switching unit 35 Temperature Total 50 Control device CH Cold / hot water SA Air

Claims

It is a heat exchange system;
With the main flow path through which the heat transfer liquid that enters and exits the heat exchange section that exchanges heat between the heat transfer liquid and the temperature control object;
A sub-flow path provided in parallel with the main flow path and having a smaller flow path cross-sectional area than the main flow path;
With the flow meter provided in the sub-flow path;
With a control device that obtains the flow rate of the heat transfer liquid flowing through the heat exchange unit based on the flow rate detected by the flow meter ;
With a flow rate adjusting unit that adjusts the flow rate of the heat transfer liquid flowing in the heat exchange system;
It is equipped with a temperature detector that detects the temperature of the temperature-controlled object or the temperature of the detection target that has a correlation with the temperature of the temperature-controlled object;
The control device does not adjust the operation time, which is the operating state time in which the flow rate of the heat transfer liquid can be adjusted in the flow rate adjusting unit, and the flow rate of the heat transfer liquid in the flow rate adjusting unit. The difference between the temperature detected by the temperature detector and the preset temperature is generated while controlling the flow rate adjusting unit so as to repeat the cycle with the stop time, which is the time of the stop state, as one cycle. The larger it is, the longer the operation time is configured;
Heat exchange system.

The sub-channel is
With a first resistance channel having a first resistance value;
With a second resistance flow path having a second resistance value different from the first resistance value;
It has a switching unit for switching between flowing the heat transport liquid through the first resistance flow path and flowing through the second resistance flow path;
The heat exchange system according to claim 1.

In the control device, the temperature detected by the temperature detector is such that the flow rate of the heat transport liquid flowing through the heat exchange unit obtained based on the flow rate detected by the flow meter is within a predetermined flow rate. The flow rate adjusting unit is controlled so as to have the preset temperature;
The heat exchange system according to claim 1 or 2.