JPH08233417A - Abnormality judging method for heat-exchanger in circulation type chiller - Google Patents
Abnormality judging method for heat-exchanger in circulation type chillerInfo
- Publication number
- JPH08233417A JPH08233417A JP6172195A JP6172195A JPH08233417A JP H08233417 A JPH08233417 A JP H08233417A JP 6172195 A JP6172195 A JP 6172195A JP 6172195 A JP6172195 A JP 6172195A JP H08233417 A JPH08233417 A JP H08233417A
- Authority
- JP
- Japan
- Prior art keywords
- heat
- exchanger
- pressure switch
- heat exchanger
- cold water
- 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.)
- Granted
Links
Landscapes
- Devices That Are Associated With Refrigeration Equipment (AREA)
- Other Air-Conditioning Systems (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、たとえば、空調設備
や食品冷却装置等に冷水を供給する循環型チラーにおけ
る熱交換器の異常判定方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for determining an abnormality of a heat exchanger in a circulation chiller which supplies cold water to an air conditioner, a food cooling device or the like.
【０００２】[0002]
【従来の技術】従来、循環型チラーを用いて、たとえ
ば、食品等を冷却する装置として図２に示すものがあ
る。前記循環型チラーは、図２に示すように、蓄熱槽２
１と冷却水用熱交換器２２との間を冷水循環路２３で連
通するとともに、前記冷却水用熱交換器２２と冷凍機２
４との間を冷媒循環路２５で連通した構成となってい
る。前記蓄熱槽２１内の冷水を用いて食品等を冷却する
冷水タンク２６を設け、この冷水タンク２６と前記蓄熱
槽２１との間を給水ポンプ２７を備えた冷水供給ライン
２８で接続するとともに、冷水タンク２６の下部と前記
冷水循環路２３との間を循環ポンプ３０を備えた冷水還
流路２９で接続している。2. Description of the Related Art Conventionally, there is an apparatus shown in FIG. 2 as an apparatus for cooling a food or the like using a circulation chiller. As shown in FIG. 2, the circulation type chiller has a heat storage tank 2
1 and the heat exchanger 22 for cooling water are connected by a cold water circulation path 23, and the heat exchanger 22 for cooling water and the refrigerator 2 are connected.
4 and the refrigerant circulation path 25 communicate with each other. A cold water tank 26 for cooling food or the like using the cold water in the heat storage tank 21 is provided, and the cold water tank 26 and the heat storage tank 21 are connected by a cold water supply line 28 having a water supply pump 27, and the cold water is A lower portion of the tank 26 and the cold water circulation passage 23 are connected by a cold water return passage 29 having a circulation pump 30.
【０００３】ところで、前記冷水タンク２６内で食品等
の被冷却物を冷却するため、若干の汚物が冷水に混入
し、汚水となって前記冷水還流路２９を介して前記熱交
換器２２の伝熱面に汚れが付着することがある。この伝
熱面に汚れが付着すると冷水の循環水量が低下し、熱交
換器のつまり状態となる。また、前記熱交換器２２の別
のつまり状態としては、前記冷水循環路２３からの循環
冷水が過冷却状態となって、前記熱交換器２２内で凍結
し、循環水量が低下することがある。By the way, in order to cool an object to be cooled such as food in the cold water tank 26, some dirt is mixed into the cold water and becomes waste water, which is transferred to the heat exchanger 22 via the cold water return passage 29. Dirt may adhere to the hot surface. When dirt adheres to this heat transfer surface, the circulating water amount of cold water decreases and the heat exchanger becomes clogged. As another clogged state of the heat exchanger 22, the circulating chilled water from the chilled water circulation passage 23 may be in a supercooled state and may be frozen in the heat exchanger 22 to reduce the amount of circulated water. .
【０００４】[0004]
【発明が解決しようとする課題】上述のように、熱交換
器のつまり原因は、伝熱面への汚れの付着によるもの
と、熱交換器内での凍結によるものとがあるが、それぞ
れのつまり（異常）原因を解消するためには、その原因
を判別する必要がある。そこで、この発明は、上述の問
題点に鑑み、循環型チラーにおける熱交換器の異常判定
方法を提供することを目的とするものである。As described above, there are two causes of clogging of the heat exchanger, namely, adhesion of dirt to the heat transfer surface and freezing in the heat exchanger. In other words, in order to eliminate the (abnormal) cause, it is necessary to determine the cause. Then, this invention aims at providing the abnormality determination method of the heat exchanger in a circulation chiller in view of the above-mentioned problem.
【０００５】[0005]
【課題を解決するための手段】この発明は、上記課題を
解決するためになされたものであって、冷凍機、冷却水
用熱交換器および蓄熱槽からなる循環型チラーにおい
て、前記蓄熱槽から被冷却水を熱交換器へ供給する循環
ポンプの吐出側に設けた圧力スイッチが作動後、凍結解
除機構を作動させ、所定時間経過後、前記圧力スイッチ
が復帰しないとき、前記熱交換器の凍結以外のつまりと
判定することを特徴としている。The present invention has been made in order to solve the above-mentioned problems, and is a circulating chiller comprising a refrigerator, a heat exchanger for cooling water, and a heat storage tank, wherein After the pressure switch provided on the discharge side of the circulation pump that supplies the water to be cooled to the heat exchanger is activated, the freeze release mechanism is activated, and if the pressure switch does not return after a predetermined time has elapsed, the heat exchanger freezes. The feature is that it is determined to be a block other than.
【０００６】[0006]
【作用】被冷却水を熱交換器へ供給する循環ポンプの吐
出側に設けた圧力スイッチが作動後、凍結解除機構を作
動させ、所定時間経過後、前記圧力スイッチが復帰しな
いとき、前記熱交換器の凍結以外のつまりと判定する。Operation: When the pressure switch provided on the discharge side of the circulation pump that supplies the water to be cooled to the heat exchanger is activated, the freeze release mechanism is activated, and when the pressure switch does not return after a predetermined time has elapsed, the heat exchange is performed. It is judged as a blockage other than freezing of the container.
【０００７】[0007]
【実施例】以下、この発明の実施例を図面に基づいて詳
細に説明する。図１は、この発明に係る循環型チラーの
概略説明図で、この循環型チラーは、冷凍機１、冷却水
用熱交換器２（以下「熱交換器２」という）および蓄熱
槽３から構成されている。冷凍機１は、たとえば液化し
た冷媒（たとえばフロン）を膨張弁１ａで減圧した後、
熱交換器２を介して被冷却水を冷媒の蒸発潜熱によって
直接冷却する方法を利用したものである。Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic explanatory view of a circulation chiller according to the present invention, which is composed of a refrigerator 1, a heat exchanger 2 for cooling water (hereinafter referred to as “heat exchanger 2”) and a heat storage tank 3. Has been done. The refrigerator 1 decompresses, for example, a liquefied refrigerant (for example, Freon) with the expansion valve 1a,
This is a method in which the water to be cooled is directly cooled by the latent heat of vaporization of the refrigerant via the heat exchanger 2.
【０００８】熱交換器２は、図１に示すように、外管２
ａを螺旋状（実施に応じては、直線状でも可能）に形成
し、その内部に内管２ｂを挿入した二重管構造であっ
て、外管２ａと内管２ｂとの間に蓄熱槽３から供給され
る被冷却水が流通し、内管２ｂ内には冷凍機１より供給
される冷媒が流通する。したがって、被冷却水を内管２
ｂの外周から冷却して冷却水を製造する構造となってい
る。As shown in FIG. 1, the heat exchanger 2 has an outer tube 2
a has a double pipe structure in which a is formed in a spiral shape (which may be a linear shape depending on the implementation), and an inner pipe 2b is inserted therein, and a heat storage tank is provided between the outer pipe 2a and the inner pipe 2b. 3 to be cooled flows, and the refrigerant supplied from the refrigerator 1 flows into the inner pipe 2b. Therefore, the water to be cooled is supplied to the inner pipe 2
It has a structure in which cooling water is produced by cooling from the outer periphery of b.
【０００９】冷凍機１と熱交換器２の内管２ｂとは、膨
張弁１ａを介して冷媒供給路４を用いて接続するととも
に冷媒還流路５を接続して冷媒を循環させる。一方、蓄
熱槽３の下部と熱交換器２の外管２ａの入口とは冷水供
給路６によって、また熱交換器の外管２ａの出口と蓄熱
槽３との間は冷却水還流路７を介して接続されており、
前記冷水供給路６に循環ポンプ８を設け、この循環ポン
プ８の吐出側に圧力スイッチ９を挿入している。そし
て、前記循環ポンプ８の手前側冷水供給路６に凍結解除
機構としての補給水路１０（たとえば水道水）が接続し
てあり、途中に電磁弁１１が挿入してある。The refrigerator 1 and the inner pipe 2b of the heat exchanger 2 are connected via the expansion valve 1a using the refrigerant supply passage 4 and the refrigerant return passage 5 to circulate the refrigerant. On the other hand, the lower part of the heat storage tank 3 and the inlet of the outer pipe 2a of the heat exchanger 2 are connected by the cold water supply passage 6, and the outlet of the outer pipe 2a of the heat exchanger and the heat storage tank 3 are connected by the cooling water return passage 7. Connected through
A circulation pump 8 is provided in the cold water supply passage 6, and a pressure switch 9 is inserted on the discharge side of the circulation pump 8. Further, a makeup water passage 10 (for example, tap water) as a freeze releasing mechanism is connected to the front side cold water supply passage 6 of the circulation pump 8, and a solenoid valve 11 is inserted in the middle thereof.
【００１０】この発明の一実施例として、前記循環型チ
ラーの蓄熱槽３の冷水を用いて、たとえば食品等を冷却
する冷水タンク１２を設け、この冷水タンク１２と前記
蓄熱槽３との間を冷水供給ライン１３で接続し、途中に
給水ポンプ１４を挿入している。そして、この冷水タン
ク１２の下部と前記冷水供給路６の所定個所を冷水還流
ライン１５で接続し、途中に逆止弁１６を挿入してい
る。符号１７は、温度センサ、１８はオーバーフローラ
インである。そして、前記冷凍機１、循環ポンプ８、圧
力スイッチ９、電磁弁１１、給水ポンプ１４、および温
度センサ１７は、制御器（図示省略）にそれぞれ回線
（図示省略）を介して接続している。As an embodiment of the present invention, a cold water tank 12 for cooling food such as food is provided by using the cold water in the heat storage tank 3 of the circulation chiller, and a space between the cold water tank 12 and the heat storage tank 3 is provided. It is connected by a cold water supply line 13, and a water supply pump 14 is inserted in the middle. A lower portion of the cold water tank 12 and a predetermined portion of the cold water supply passage 6 are connected by a cold water return line 15, and a check valve 16 is inserted in the middle. Reference numeral 17 is a temperature sensor, and 18 is an overflow line. The refrigerator 1, the circulation pump 8, the pressure switch 9, the electromagnetic valve 11, the water supply pump 14, and the temperature sensor 17 are connected to a controller (not shown) via lines (not shown).
【００１１】つぎに、上記構成の循環型チラーにおける
熱交換器の異常判定方法を説明する。まず、補給水路１
０の電磁弁１１を開き、循環ポンプ８を駆動するととも
に冷凍機１を運転し、蓄熱槽３の所定水位まで冷水を貯
水した後、冷水供給ライン１３の給水ポンプ１４を駆動
し、冷水タンク１２の所定水位まで所定温度（たとえば
１℃）の冷水を貯水後、前記補給水路１０の電磁弁１１
を閉じる。そして、たとえば食品等の被冷却物を前記冷
水タンク１２内で冷却する。前記冷水タンク１２内に設
けた温度センサ１７は、冷水温度を検出し制御器（図示
省略）に通報する。制御器は、前記温度センサ１７から
の信号に基づき前記冷凍機１の運転を制御する。Next, a method of determining abnormality of the heat exchanger in the circulation type chiller having the above-mentioned structure will be described. First, make-up water channel 1
The solenoid valve 11 of 0 is opened, the circulation pump 8 is driven, the refrigerator 1 is operated, cold water is stored up to a predetermined water level in the heat storage tank 3, and then the water supply pump 14 of the cold water supply line 13 is driven to cool the cold water tank 12 After storing cold water having a predetermined temperature (for example, 1 ° C.) up to a predetermined water level, the solenoid valve 11 of the make-up water channel 10
Close. Then, an object to be cooled such as food is cooled in the cold water tank 12. The temperature sensor 17 provided in the cold water tank 12 detects the cold water temperature and notifies the controller (not shown). The controller controls the operation of the refrigerator 1 based on the signal from the temperature sensor 17.
【００１２】ところで、前記循環ポンプ８の吐出側に設
けた圧力スイッチ９は、前記熱交換器２内に異常（循環
水量の低下、すなわちつまり現象が発生し、所定圧力、
たとえば２．０ｋｇ／ｃｍ2 、通常圧力は１．５ｋｇ／
ｃｍ2 ）を検出すると、信号を制御器（図示省略）へ通
報する。制御器は、凍結解除機構としての前記補給水路
１０の電磁弁１１を開き常温水（水道水）を前記冷水供
給路６を介して前記熱交換器２へ供給する。そして、所
定時間経過後、前記圧力スイッチ９が通常圧力に復帰す
れば、前記熱交換器２内での凍結によるつまりであった
と判定し、前記電磁弁１１を閉じる。また、所定時間経
過後も前記圧力スイッチ９が所定圧力の状態のときは、
凍結以外のつまり、すなわち前記熱交換器２の伝熱面に
汚れが付着し、つまり現象が起り始めたと判定する。し
たがって、前記圧力センサ９が作動し、所定時間経過後
に前記圧力センサ９が通常圧力に復帰すれば、前記熱交
換器２内での凍結を自動的に解除したことになり、また
通常圧力に復帰しないときは、前記熱交換器２内につま
り現象が起り始めたと判定し、警報等を発してメンテナ
ンスの必要性を通報する。By the way, the pressure switch 9 provided on the discharge side of the circulation pump 8 is abnormal in the heat exchanger 2 (a decrease in circulating water amount, that is, a phenomenon occurs, and a predetermined pressure,
For example, 2.0 kg / cm 2 , normal pressure is 1.5 kg /
cm 2 ), a signal is sent to a controller (not shown). The controller opens the electromagnetic valve 11 of the makeup water passage 10 as a freeze release mechanism to supply normal temperature water (tap water) to the heat exchanger 2 via the cold water supply passage 6. Then, if the pressure switch 9 returns to the normal pressure after a lapse of a predetermined time, it is determined that the pressure switch 9 is clogged due to freezing in the heat exchanger 2, and the solenoid valve 11 is closed. If the pressure switch 9 is still in the predetermined pressure state even after the predetermined time has passed,
In other words, it is determined that dirt other than freezing, that is, the heat transfer surface of the heat exchanger 2 is contaminated, that is, a phenomenon starts to occur. Therefore, if the pressure sensor 9 operates and the pressure sensor 9 returns to the normal pressure after a predetermined time elapses, it means that the freezing in the heat exchanger 2 is automatically released, and the pressure returns to the normal pressure. If not, it is determined that the phenomenon has started to occur in the heat exchanger 2, and an alarm or the like is issued to notify the necessity of maintenance.
【００１３】前記熱交換器２の異常判定に圧力スイッチ
９を用いたが、この発明は、前記圧力スイッチ９に限定
されるものではなく、たとえば流量センサ等を用いるこ
とも実施に応じて好適である。Although the pressure switch 9 is used for determining the abnormality of the heat exchanger 2, the present invention is not limited to the pressure switch 9, and a flow sensor or the like may be used depending on the implementation. is there.
【００１４】[0014]
【発明の効果】以上説明したように、この発明によれ
ば、蓄熱槽から被冷却水を熱交換器へ供給する循環ポン
プの吐出側に設けた圧力スイッチが作動後、凍結解除機
構を作動させ、所定時間経過後、前記圧力スイッチが復
帰しないとき、前記熱交換器の凍結以外のつまりと判定
するようにしたので、熱交換器内の凍結により前記圧力
スイッチが作動した場合は、前記凍結解除機構の作用に
より自動的に凍結を解除し、循環型チラーを正常に連続
運転させることができる。また、前記圧力スイッチが復
帰しないときは、凍結以外のつまりと判定し、警報等を
発してメンテナンスの必要性を通報するので、循環型チ
ラーにおける自己診断上の効果は大きい。As described above, according to the present invention, after the pressure switch provided on the discharge side of the circulation pump for supplying the water to be cooled from the heat storage tank to the heat exchanger is activated, the freeze release mechanism is activated. When the pressure switch does not recover after a predetermined time has elapsed, it is determined that the heat exchanger is clogged other than freezing, so if the pressure switch operates due to freezing in the heat exchanger, the freezing is released. By the action of the mechanism, the freezing is automatically released and the circulating chiller can be normally operated continuously. Further, when the pressure switch does not return, it is determined to be a block other than freezing, and an alarm or the like is issued to notify the necessity of maintenance. Therefore, the self-diagnosis effect of the circulation chiller is great.
【図１】この発明の一実施例を示す循環型チラーの概略
説明図である。FIG. 1 is a schematic explanatory view of a circulation chiller showing an embodiment of the present invention.
【図２】従来の循環型チラーの概略説明図である。FIG. 2 is a schematic explanatory view of a conventional circulation chiller.
１ 冷凍機 ２ 熱交換器 ３ 蓄熱槽 ８ 循環ポンプ ９ 圧力スイッチ 1 Refrigerator 2 Heat exchanger 3 Heat storage tank 8 Circulation pump 9 Pressure switch
Claims (1)
熱槽３からなる循環型チラーにおいて、前記蓄熱槽３か
ら被冷却水を熱交換器２へ供給する循環ポンプ８の吐出
側に設けた圧力スイッチ９が作動後、凍結解除機構を作
動させ、所定時間経過後、前記圧力スイッチ９が復帰し
ないとき、前記熱交換器２の凍結以外のつまりと判定す
ることを特徴とする循環型チラーにおける熱交換器の異
常判定方法。1. A circulation type chiller comprising a refrigerator 1, a heat exchanger for cooling water 2 and a heat storage tank 3 is provided on a discharge side of a circulation pump 8 for supplying water to be cooled from the heat storage tank 3 to the heat exchanger 2. After the pressure switch 9 provided is operated, the freeze release mechanism is operated, and when the pressure switch 9 does not return after a predetermined time has passed, it is determined that the heat exchanger 2 is a block other than freezing. Chiller heat exchanger abnormality determination method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP06172195A JP3404969B2 (en) | 1995-02-23 | 1995-02-23 | Method for judging abnormality of heat exchanger in circulation chiller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP06172195A JP3404969B2 (en) | 1995-02-23 | 1995-02-23 | Method for judging abnormality of heat exchanger in circulation chiller |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08233417A true JPH08233417A (en) | 1996-09-13 |
| JP3404969B2 JP3404969B2 (en) | 2003-05-12 |
Family
ID=13179379
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP06172195A Expired - Fee Related JP3404969B2 (en) | 1995-02-23 | 1995-02-23 | Method for judging abnormality of heat exchanger in circulation chiller |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3404969B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009236343A (en) * | 2008-03-26 | 2009-10-15 | Suido Kiko Kaisha Ltd | Liquid cooling system |
| JP2014219115A (en) * | 2013-05-01 | 2014-11-20 | 菱熱工業株式会社 | Cold water manufacturing device |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101944754B1 (en) * | 2018-09-06 | 2019-02-01 | 주식회사 에이알 | Cooling water circulation system having structure for preventing cooling water from leaking and air conditioner and server rack cooling system including the same |
-
1995
- 1995-02-23 JP JP06172195A patent/JP3404969B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009236343A (en) * | 2008-03-26 | 2009-10-15 | Suido Kiko Kaisha Ltd | Liquid cooling system |
| JP2014219115A (en) * | 2013-05-01 | 2014-11-20 | 菱熱工業株式会社 | Cold water manufacturing device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3404969B2 (en) | 2003-05-12 |
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