JP2016180517A - Operation method of cooling system - Google Patents

Operation method of cooling system Download PDF

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JP2016180517A
JP2016180517A JP2015059821A JP2015059821A JP2016180517A JP 2016180517 A JP2016180517 A JP 2016180517A JP 2015059821 A JP2015059821 A JP 2015059821A JP 2015059821 A JP2015059821 A JP 2015059821A JP 2016180517 A JP2016180517 A JP 2016180517A
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water
cooling
line
cooling water
tower
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堀田　博之
Hiroyuki Hotta
博之 堀田
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Daicen Membrane Systems Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide an operation method of a cooling system capable of reducing an operation cost.SOLUTION: In an operation method of a cooling system provided with an open type cooling tower 1 and a refrigerating machine 2, the cooling system has a circulation line of cooling water which passes through a water feeding line 11 of cooling water, the refrigerating machine and a return line 12 of cooling water from the open type cooling tower and returns to the cooling tower and, further, the open type cooling tower has a makeup water line 16 of cooling water and a draining line 13 of cooling water. When the operation method of the cooling system continues a circulation operation of cooling water, scale accumulated in the circulation line of the cooling water is drained together with a part of the cooling water from the draining line of the cooling water and the cooling water reduced by drainage is replenished from the makeup water line of the cooling water. Therein, as makeup water to be replenished from the makeup water line, water having electric conductivity of 100 μS/cm or less is used.SELECTED DRAWING: Figure 1

Description

本発明は、冷却塔と冷凍機を備えた冷却システムの運転方法に関する。   The present invention relates to a method for operating a cooling system including a cooling tower and a refrigerator.

冷却塔（クーリングタワー）は、建物内の空調設備などとして使用されている冷凍機の冷却水を冷却するために使用されている。
冷却塔と冷凍機は、冷凍機にて室内空気を冷却することで加温された冷却水を冷却塔に戻して冷却塔で冷却した後、冷凍機に送る循環ラインを利用した循環運転を実施している A cooling tower (cooling tower) is used to cool the cooling water of a refrigerator used as an air conditioning facility in a building.
The cooling tower and the refrigerator are circulated using a circulation line that sends the cooling water heated by cooling the room air with the refrigerator to the cooling tower and then cooled by the cooling tower, and then sent to the refrigerator. doing

冷却塔には開放式と密閉式がある。
開放式の冷却塔は、ファンを使用して円筒形の充填材の外側から内側に空気を通しながら、並行して充填材の上方に設置された上部水槽から冷却水を散水して、冷却水と外気を直接接触させることで冷却水を冷却するものである。冷却後の冷却水は、充填材の下方に設置された下部水槽に集めて循環使用される。
この冷却過程において、散水した冷却水の一部が蒸発したり、飛散したりするため、循環運転を継続すると、循環ラインの冷却水中のスケール成分濃度が高くなり、さらに継続すると循環ラインが詰まるおそれもある。
このため、通常は蒸発飛散した冷却水と同量の水を補給すると共に、循環ライン内の冷却水の一部を排水した後、新鮮な補給水（水道水）を補給している。 There are open and closed cooling towers.
The open-type cooling tower uses a fan to sprinkle cooling water from the upper water tank installed above the packing material while passing air from the outside to the inside of the cylindrical packing material. The cooling water is cooled by direct contact with the outside air. The cooling water after cooling is collected and circulated in a lower water tank installed below the filler.
In this cooling process, part of the sprinkled cooling water evaporates or scatters. Therefore, if the circulation operation is continued, the concentration of scale components in the cooling water in the circulation line will increase, and if it continues further, the circulation line may be clogged. There is also.
For this reason, normally, the same amount of water as the evaporated and scattered cooling water is replenished, and a part of the cooling water in the circulation line is drained, and then fresh replenishing water (tap water) is replenished.

特許文献１、２には、上記循環ライン中に逆浸透膜装置を配置して循環水を処理することで、スケール成分濃度の上昇を抑制する発明が記載されている。
特許文献３〜５には、逆浸透膜などを使用して上記循環ラインから排水された水を処理し、再利用する発明が記載されている。 Patent Documents 1 and 2 describe inventions in which the reverse osmosis membrane device is disposed in the circulation line to treat the circulating water, thereby suppressing an increase in scale component concentration.
Patent Documents 3 to 5 describe inventions in which water drained from the circulation line is treated and reused using a reverse osmosis membrane or the like.

特開平２−９５４９３号公報Japanese Patent Laid-Open No. 2-95493 特開平４−２５０８８０号公報JP-A-4-250880 特開２００２−１８４３７号公報JP 2002-18437 A 特開２００２−３１０５９５号公報JP 2002-310595 A 特開２００３−１２５６号公報JP 2003-1256 A

本発明は、冷却水の排水量と補給水の補給量を減少させ、運転コストを低減させることができる、冷却塔と冷凍機を備えた冷却システムの運転方法を提供することを課題とする。   An object of the present invention is to provide a method for operating a cooling system including a cooling tower and a refrigerator, which can reduce the amount of cooling water discharged and the amount of makeup water supplied, thereby reducing the operating cost.

本発明は、開放式冷却塔と冷凍機を備えた冷却システムの運転方法であって、
前記冷却システムが、
前記開放式冷却塔と前記冷凍機の間で、前記開放式冷却塔から、冷却水の送水ライン、冷凍機、冷却水の返送ラインを通り、前記冷却塔に戻る冷却水の循環ラインを有しており、
さらに前記開放式冷却塔が、冷却水の補給水ラインと冷却水の排水ラインを有しているものであり、
前記冷却システムの運転方法が、
前記冷却水循環ラインに冷却水を循環させる冷却水の循環運転を継続するとき、
前記冷却水の循環ライン内に蓄積したスケールを前記冷却水の排水ラインから冷却水の一部と共に排水し、前記排水により減少した冷却水を前記冷却水の補給ラインから補給する運転方法であり、
前記補給ラインから補給する補給水のとして、電気伝導度が１００μＳ／ｃｍ以下の水を使用する、冷却システムの運転方法を提供する。 The present invention is a method of operating a cooling system comprising an open cooling tower and a refrigerator,
The cooling system comprises:
Between the open-type cooling tower and the refrigerator, there is a cooling water circulation line from the open-type cooling tower, passing through a cooling water supply line, a refrigerator, a cooling water return line, and returning to the cooling tower. And
Furthermore, the open-type cooling tower has a cooling water supply water line and a cooling water drain line,
An operation method of the cooling system is:
When continuing the cooling water circulation operation for circulating the cooling water to the cooling water circulation line,
The scale accumulated in the cooling water circulation line is drained together with a part of the cooling water from the cooling water drain line, and the cooling water reduced by the drainage is replenished from the cooling water replenishment line,
Provided is a cooling system operating method in which water having an electric conductivity of 100 μS / cm or less is used as makeup water to be replenished from the replenishment line.

本発明の処理システムの運転方法によれば、循環ライン内の循環水の電気伝導度を低いレベルで維持することができるようになる。
このため、冷却水の排水量を大きく削減することができ、冷却水の補給水として水道水を使用した場合と比べると、上水道料金と下水道料金を合わせた大きな運転コストの低減効果が得られる。 According to the operation method of the treatment system of the present invention, the electrical conductivity of the circulating water in the circulation line can be maintained at a low level.
For this reason, the amount of cooling water drainage can be greatly reduced, and compared with the case where tap water is used as the replenishing water for cooling water, a large operating cost reduction effect is obtained by combining the water supply charges and the sewerage charges.

本発明の冷却システムの運転方法を実施するための冷却システムの処理フロー図。The processing flow figure of the cooling system for enforcing the operating method of the cooling system of the present invention.

＜冷却システム＞
図１に示す冷却システムでは、冷却塔１、冷凍機２、中水槽３、受水槽４、逆浸透膜装置（ＲＯ装置）５、補給水槽６の設置場所は特に制限されるものではない。
冷却塔１と冷凍機２は、冷却塔１から冷凍機２に向かって流れる、ポンプ２１が配置された冷却水ライン１１で接続されている。
冷却塔１は、特許文献１〜５にも記載されている公知のものであり、冷凍機２から戻された加温された冷却水を外気と熱交換する開放型のものである。
冷却塔１は、中水槽３と接続された排水ライン１３を有している。排水ライン１３には開閉バルブを配置することができる。
冷凍機２は特に制限されるものではなく、蒸気圧縮冷凍機、吸収式冷凍機、吸着式冷凍機などを挙げることができる。 <Cooling system>
In the cooling system shown in FIG. 1, the installation locations of the cooling tower 1, the refrigerator 2, the middle water tank 3, the water receiving tank 4, the reverse osmosis membrane device (RO device) 5, and the makeup water tank 6 are not particularly limited.
The cooling tower 1 and the refrigerator 2 are connected by a cooling water line 11 in which a pump 21 is arranged and flows from the cooling tower 1 toward the refrigerator 2.
The cooling tower 1 is a well-known thing described also in patent documents 1-5, and is an open type thing which heat-exchanges the warmed cooling water returned from the refrigerator 2 with external air.
The cooling tower 1 has a drain line 13 connected to the middle water tank 3. An open / close valve can be disposed in the drain line 13.
The refrigerator 2 is not particularly limited, and examples thereof include a vapor compression refrigerator, an absorption refrigerator, and an adsorption refrigerator.

冷凍機２と冷却塔１は、冷凍機２から冷却塔１に向かって流れる冷却水の返送ライン１２で接続されている。
冷却塔１から、冷却水ライン１１、冷凍機２および冷却水の返送ライン１２を通り、冷却塔１に戻る冷却水の循環ラインが形成されている。
冷却水循環ラインには、図示していない電気伝導度を測定するための採水ラインが接続されており、さらに前記採水ラインには電気伝導度の測定器が接続されており、電気伝導度が自動計測できるようになっていてもよい。 The refrigerator 2 and the cooling tower 1 are connected by a return line 12 of cooling water flowing from the refrigerator 2 toward the cooling tower 1.
A cooling water circulation line is formed from the cooling tower 1 through the cooling water line 11, the refrigerator 2, and the cooling water return line 12 and returning to the cooling tower 1.
A water sampling line for measuring electrical conductivity (not shown) is connected to the cooling water circulation line, and a measuring device for electrical conductivity is further connected to the water sampling line. Automatic measurement may be possible.

受水槽４には、水道水や地下水を貯水する。
受水槽４と逆浸透膜装置（ＲＯ装置）５は、ＲＯ装置ポンプ２２が配置された送水ライン１４で接続されている。
ＲＯ装置５は、例えば、ダイセン・メンブレン・システムズ株式会社より販売されている、装置型式ＶＣＲ４０シリーズ、ＶＣＲ８０シリーズ、ＮＥＲ４０シリーズ、ＮＥＲ８０シリーズ、ＳＨＲシリーズなどを用いることができる。 The water receiving tank 4 stores tap water and groundwater.
The water receiving tank 4 and the reverse osmosis membrane device (RO device) 5 are connected by a water supply line 14 in which the RO device pump 22 is arranged.
As the RO device 5, for example, device types VCR40 series, VCR80 series, NER40 series, NER80 series, SHR series and the like sold by Daisen Membrane Systems Co., Ltd. can be used.

ＲＯ装置５の透過水出口５ａと補給水槽６は、ＲＯ装置処理水（ＲＯ水）の送水ライン１５で接続されている。
ＲＯ装置５の濃縮水出口５ｂは、濃縮水ライン１８により中水槽３に接続されているか、または図示するように濃縮水ライン１８が排水ライン１５に接続されていてもよい。
なお、運転開始時、または必要に応じて冷却塔１に冷却用の水（水道水、地下水）を供給できるようにするため、ＲＯ装置５を介さずに受水槽４と補給水槽６を接続するライン１９とポンプ２３を設けることができる。 The permeated water outlet 5a of the RO device 5 and the replenishing water tank 6 are connected by a water supply line 15 for RO device treated water (RO water).
The concentrated water outlet 5b of the RO device 5 is connected to the middle water tank 3 by the concentrated water line 18, or the concentrated water line 18 may be connected to the drainage line 15 as shown in the figure.
In addition, in order to be able to supply cooling water (tap water, groundwater) to the cooling tower 1 at the start of operation or as necessary, the water receiving tank 4 and the replenishing water tank 6 are connected without using the RO device 5. Line 19 and pump 23 can be provided.

補給水槽６と冷却塔１は、冷却水の補給水ライン１６で接続されている。冷却水の補給水ライン１６には、スケール防止剤が入った容器７からスケール防止剤を添加するためのライン１７が接続されていてもよい。
スケール防止剤は公知のものを使用することができ、例えば、ホスホン酸系、ポリリン酸系、ポリアクリル酸系、ポリアクリルアミド系などのスケール防止剤を使用することができる。 The makeup water tank 6 and the cooling tower 1 are connected by a makeup water line 16 for the cooling water. A line 17 for adding the scale inhibitor from the container 7 containing the scale inhibitor may be connected to the cooling water supply water line 16.
Known scale inhibitors can be used, and for example, phosphonic acid-based, polyphosphoric acid-based, polyacrylic acid-based, and polyacrylamide-based scale inhibitors can be used.

＜冷却システムの運転方法＞
冷凍機２の運転を開始し、冷却塔１から冷却水を冷却水ライン１１で送る。
冷却水ライン１１で送られた冷却水は、冷凍機２での熱交換により加温された後、戻りライン１２で冷却塔１に戻されて再度冷却された後、再び冷却水ライン１１から冷凍機２に送られる。
冷却システムの運転中は、このような冷却水循環ラインを利用した循環運転が継続して実施される。 <Cooling system operation method>
The operation of the refrigerator 2 is started, and cooling water is sent from the cooling tower 1 through the cooling water line 11.
The cooling water sent in the cooling water line 11 is heated by heat exchange in the refrigerator 2, then returned to the cooling tower 1 in the return line 12, cooled again, and then frozen from the cooling water line 11 again. Sent to machine 2.
During operation of the cooling system, circulation operation using such a cooling water circulation line is continuously performed.

冷却塔１において水を冷却するときには、戻ってきた加温された冷却水と外気を熱交換させることで冷却する。この際、冷却水の一部が、蒸発・飛散する。
このため、冷却システムの循環運転を継続すると、シリカ、マグネシウム、カルシウムなどのスケール成分濃度が次第に高くなってくる。
このときのスケール成分濃度を電気伝導度で評価することで、電気伝導度が所定値になったとき、運転を継続したまま、またはポンプ２１を停止して循環ラインの循環運転を停止して、排水ライン１３から循環ライン内の冷却水の一部を中水槽３に排水する。中水槽３内の排水は、そのまま中水として再利用することができる。 When water is cooled in the cooling tower 1, it is cooled by exchanging heat between the returned heated cooling water and the outside air. At this time, a part of the cooling water is evaporated and scattered.
For this reason, if the circulation operation of the cooling system is continued, the concentration of the scale components such as silica, magnesium, calcium and the like gradually increases.
By evaluating the scale component concentration at this time by electric conductivity, when the electric conductivity reaches a predetermined value, the operation is continued or the pump 21 is stopped to stop the circulation operation of the circulation line, A part of the cooling water in the circulation line is drained from the drain line 13 to the middle water tank 3. The waste water in the middle water tank 3 can be reused as it is.

本発明では、冷却水循環ラインを循環する冷却水の電気伝導度が好ましくは１０００μＳ／ｃｍ以上、より好ましくは１２００μＳ／ｃｍ以上になったときに、循環ライン内のスケール成分を冷却水の一部と共に排水ライン１３から中水槽３に排水する。
その後、補給水槽６内の水を補給水ライン１６から冷却塔１に補給する。
このとき、補給水槽６内の水は、電気伝導度が１００μＳ／ｃｍ以下であり、好ましくは電気伝導度が８０μＳ／ｃｍ以下、より好ましくは電気伝導度が７０μＳ／ｃｍ以下であり、Ｃａイオン、Ｍｇイオン、Ｎａイオン、Ｃｌイオン、イオン状シリカなどの濃度の低いものが好ましい。
補給水槽６内の水は、前記した電気伝導度になるようにした、ＲＯ装置５で製造されたＲＯ水、ＲＯ水と地下水または水道水を混合した混合水を使用することができる。
ＲＯ装置５で製造されたＲＯ水を使用するときは、受水槽４から送水ライン１４により地下水または水道水をＲＯ装置５供給してＲＯ水を製造し、補給水槽６に送って貯水しておいたものを使用する。
ＲＯ水と地下水または水道水を混合した混合水を使用するときは、前記と同様にして補給水槽６にＲＯ水を送ると共に、受水槽４から送水ライン１９により地下水または水道水を補給水槽６に送って貯水しておいたものを使用する。 In the present invention, when the electrical conductivity of the cooling water circulating through the cooling water circulation line is preferably 1000 μS / cm or more, more preferably 1200 μS / cm or more, the scale component in the circulation line is combined with a part of the cooling water. Drain from the drain line 13 to the middle tank 3.
Thereafter, water in the make-up water tank 6 is supplied to the cooling tower 1 from the make-up water line 16.
At this time, the water in the makeup water tank 6 has an electric conductivity of 100 μS / cm or less, preferably an electric conductivity of 80 μS / cm or less, more preferably an electric conductivity of 70 μS / cm or less, and Ca ions, Those having a low concentration such as Mg ion, Na ion, Cl ion and ionic silica are preferred.
The water in the replenishing water tank 6 can be RO water produced by the RO device 5 and mixed water obtained by mixing RO water and ground water or tap water so as to have the above-described electrical conductivity.
When the RO water produced by the RO device 5 is used, the RO water 5 is supplied from the water receiving tank 4 through the water supply line 14 to the RO device 5 to produce the RO water, which is then sent to the makeup water tank 6 for storage. Use what you had.
When mixed water in which RO water and ground water or tap water are mixed is used, RO water is sent to the make-up water tank 6 in the same manner as described above, and ground water or tap water is supplied from the water receiving tank 4 to the make-up water tank 6 through the water supply line 19. Use what you have sent and stored.

冷却システムの運転条件の一実施形態は、次のとおりである。
循環ラインの循環水量が２５０ｍ3／Ｈであるとき、排水ライン１３からの排水量（年間平均排水量）は、循環水量の約０．４容量％の約１ｍ3／Ｈであり、蒸発・飛散量は約２．１ｍ3／Ｈである。このため、これらの合計の約３．１ｍ3／Ｈと同量程度の補給水を補給する。
このように循環水量の一部を電気伝導度の低い水で置換することで、循環ライン内の電気伝導度を低いレベルで維持することができるようになる。 One embodiment of the operating conditions of the cooling system is as follows.
When the circulating water volume in the circulation line is 250 m 3 / H, the drainage volume from the drain line 13 (annual average drainage volume) is about 1 m 3 / H, which is about 0.4% by volume of the circulating water volume. About 2.1 m 3 / H. For this reason, the same amount of makeup water as about 3.1 m 3 / H in total is replenished.
Thus, by replacing a part of the circulating water amount with water having low electrical conductivity, the electrical conductivity in the circulation line can be maintained at a low level.

実施例１
図１に示す処理システムの運転を実施した。
受水層４には、電気伝導度が１９０μＳ／ｃｍの水道水を常時貯水した。
ＲＯ装置５によりＲＯ水（電気伝導度は約４０μＳ／ｃｍ）を製造し、補給水槽６内に貯水しておいた。
ポンプ２１を駆動させて、冷却塔１と熱交換器２の間の循環ラインで循環水量２５０ｍ3／Ｈで循環運転した。
冷却水として、最初は受水槽４と同じ水道水を使用し、補給水としてＲＯ装置５の造水能力分のＲＯ水を使用し、不足分を補うため全体の２割程度は水道水を混合して使用した。
ＲＯ水と水道水を混合した補給水の電気伝導度は、約６７μＳ／ｃｍであった。
運転中に、蒸発飛散による減少水量は補給水槽６の貯水から補給した。 Example 1
The processing system shown in FIG. 1 was operated.
In the water receiving layer 4, tap water having an electric conductivity of 190 μS / cm was always stored.
RO water (electric conductivity is about 40 μS / cm) was manufactured by the RO device 5 and stored in the makeup water tank 6.
The pump 21 was driven to circulate in the circulation line between the cooling tower 1 and the heat exchanger 2 with a circulating water amount of 250 m 3 / H.
As the cooling water, the same tap water as the water receiving tank 4 is initially used, and the RO water for the capacity of the RO device 5 is used as the make-up water. To compensate for the shortage, about 20% of the total is mixed with the tap water. Used.
The electric conductivity of the makeup water mixed with RO water and tap water was about 67 μS / cm.
During operation, the amount of water decreased due to evaporation and scattering was replenished from the water stored in the replenishing water tank 6.

定期的に循環ラインに接続した採水ラインから採水して、電気伝導度を測定し、循環ライン内の冷却水の電気伝導度が１２００μＳ／ｃｍを超えたとき、ポンプ２１を停止して循環運転を一時的に停止した。   Periodically, water is collected from a water collection line connected to the circulation line, and the electrical conductivity is measured. When the electrical conductivity of the cooling water in the circulation line exceeds 1200 μS / cm, the pump 21 is stopped and circulated. Operation was temporarily stopped.

その後、排水ライン１３から循環ライン内の冷却水の一部を中水槽３に排水した。排水量は、補給水槽６の貯水量と同程度とした。
排水後、排水量と同量程度の補給水（電気伝導度６７μＳ／ｃｍ）を補給水ライン１６から冷却塔１に補給して、循環運転を再開した。
このような運転サイクルで１年の継続運転を実施した。
その結果、運転期間中の平均排水量は７．４ｍ3／dayであった。 Thereafter, a part of the cooling water in the circulation line was drained from the drain line 13 to the middle water tank 3. The amount of drainage was approximately the same as the amount of water stored in the makeup tank 6.
After drainage, replenishment water (electric conductivity 67 μS / cm) of the same amount as the drainage was replenished to the cooling tower 1 from the replenishment water line 16 and the circulation operation was resumed.
A continuous operation for one year was carried out in such an operation cycle.
As a result, the average amount of drainage during the operation period was 7.4 m 3 / day.

比較例１
補給水として、水道水（電気伝導度約１９０μＳ／ｃｍ）を使用したほかは、実施例１と同様にして１年の循環運転を実施した。
その結果、運転期間中の平均排水量は２３．２ｍ3／dayであった。 Comparative Example 1
A one-year circulation operation was carried out in the same manner as in Example 1 except that tap water (electric conductivity of about 190 μS / cm) was used as makeup water.
As a result, the average amount of drainage during the operation period was 23.2 m 3 / day.

実施例１と比較例１の対比から、実施例１の運転方法を実施することによって、平均排水量を大きく削減することができた。このため、金電気料金および下水道料金の両方を節約することができ、これはＲＯ装置の運転に使用する電気料金を差し引いても、大きな運転コストの節約となった。
また運転時にスケール防止剤を添加する場合であっても、実施例１は比較例１よりも添加量を大きく減量することができる。 From the comparison between Example 1 and Comparative Example 1, the average amount of drainage could be greatly reduced by carrying out the operation method of Example 1. For this reason, both the gold electricity charge and the sewerage charge can be saved, and even if the electricity charge used for the operation of the RO device is subtracted, the operation cost is greatly reduced.
Further, even when a scale inhibitor is added during operation, Example 1 can reduce the amount of addition much more than that of Comparative Example 1.

本発明の冷却塔と冷凍機を備えた冷却システムの運転方法は、冷却塔を使用した比較的大規模の冷却システムに使用することができる。   The method for operating a cooling system including a cooling tower and a refrigerator according to the present invention can be used for a relatively large-scale cooling system using a cooling tower.

１ 冷却塔
２ 冷凍機
３ 中水槽
４ 受水槽
５ ＲＯ装置
６ 補給水槽 DESCRIPTION OF SYMBOLS 1 Cooling tower 2 Refrigerator 3 Middle water tank 4 Receiving tank 5 RO apparatus 6 Supplementary water tank

Claims (3)

開放式冷却塔と冷凍機を備えた冷却システムの運転方法であって、
前記冷却システムが、
前記開放式冷却塔と前記冷凍機の間で、前記開放式冷却塔から、冷却水の送水ライン、冷凍機、冷却水の返送ラインを通り、前記冷却塔に戻る冷却水の循環ラインを有しており、
さらに前記開放式冷却塔が、冷却水の補給水ラインと冷却水の排水ラインを有しているものであり、
前記冷却システムの運転方法が、
前記冷却水循環ラインに冷却水を循環させる冷却水の循環運転を継続するとき、
前記冷却水の循環ライン内に蓄積したスケールを前記冷却水の排水ラインから冷却水の一部と共に排水し、前記排水により減少した冷却水を前記冷却水の補給ラインから補給する運転方法であり、
前記補給ラインから補給する補給水として、電気伝導度が１００μＳ／ｃｍ以下の水を使用する、冷却システムの運転方法。 A method of operating a cooling system comprising an open cooling tower and a refrigerator,
The cooling system comprises:
Between the open-type cooling tower and the refrigerator, there is a cooling water circulation line from the open-type cooling tower, passing through a cooling water supply line, a refrigerator, a cooling water return line, and returning to the cooling tower. And
Furthermore, the open-type cooling tower has a cooling water supply water line and a cooling water drain line,
An operation method of the cooling system is:
When continuing the cooling water circulation operation for circulating the cooling water to the cooling water circulation line,
The scale accumulated in the cooling water circulation line is drained together with a part of the cooling water from the cooling water drain line, and the cooling water reduced by the drainage is replenished from the cooling water replenishment line,
An operation method of a cooling system, wherein water having an electric conductivity of 100 μS / cm or less is used as makeup water to be replenished from the replenishment line. 前記冷却水の循環ラインを循環する冷却水の電気伝導度が１０００μＳ／ｃｍ以上になったときに冷却水の循環運転を停止して、排水ラインから冷却水の一部を排水し、前記補給水ラインから逆浸浸透膜装置で処理した処理水を含む電気伝導度が１００μＳ／ｃｍ以下の水を補給する、請求項１記載の冷却システムの運転方法。   When the electrical conductivity of the cooling water circulating through the cooling water circulation line reaches 1000 μS / cm or more, the cooling water circulation operation is stopped, a part of the cooling water is drained from the drain line, and the makeup water is supplied. The operation method of the cooling system according to claim 1, wherein water having an electric conductivity of 100 μS / cm or less including treated water treated by a reverse osmosis membrane device is replenished from a line. 前記補給水が、逆浸浸透膜装置で処理した処理水、または逆浸浸透膜装置で処理した処理水と地下水もしくは水道水の混合水である、請求項１または２記載の冷却システムの運転方法。   The method of operating a cooling system according to claim 1 or 2, wherein the makeup water is treated water treated with a reverse osmosis membrane device, or a mixed water treated with a reverse osmosis membrane device and ground water or tap water. .
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