WO2017006455A1 - Method for evaluating cleanliness of coolant line - Google Patents

Method for evaluating cleanliness of coolant line Download PDF

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Publication number
WO2017006455A1
WO2017006455A1 PCT/JP2015/069622 JP2015069622W WO2017006455A1 WO 2017006455 A1 WO2017006455 A1 WO 2017006455A1 JP 2015069622 W JP2015069622 W JP 2015069622W WO 2017006455 A1 WO2017006455 A1 WO 2017006455A1
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Prior art keywords
cooling water
contamination
water line
condenser
evaluating
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PCT/JP2015/069622
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French (fr)
Japanese (ja)
Inventor
義尚 岸根
元揮 谷垣
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栗田工業株式会社
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Priority to PCT/JP2015/069622 priority Critical patent/WO2017006455A1/en
Publication of WO2017006455A1 publication Critical patent/WO2017006455A1/en

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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/50—Treatment of water, waste water, or sewage by addition or application of a germicide or by oligodynamic treatment
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B1/00—Compression machines, plants or systems with non-reversible cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
    • F28G13/00—Appliances or processes not covered by groups F28G1/00 - F28G11/00; Combinations of appliances or processes covered by groups F28G1/00 - F28G11/00

Definitions

  • the present invention relates to a method for evaluating the fouling of a refrigeration system equipped with a compression refrigerator or an absorption refrigerator.
  • the present invention relates to a method for evaluating contamination of a cooling water line when circulating cooling water through a condenser of the refrigerator.
  • water systems including various heat exchangers such as refrigerators are provided, and cooling water and the object to be cooled are brought into contact with each other through the heat exchanger to cool the object to be cooled (in some cases, latent heat is used). Including those that only take away).
  • a refrigerant such as chlorofluorocarbon or water is used as an object to be cooled.
  • various heat exchangers are used, and air, an oily substance, and various organic substances are used as a body to be cooled.
  • condensers those that are accompanied by condensation of the cooled object are referred to as condensers, and those that are not accompanied by condensation of the cooled object are referred to as coolers.
  • a compression type refrigerator with condensation will be mainly described as an example.
  • the present invention is not limited to the compression type refrigerator, and can be applied to general heat exchangers.
  • the cooling water in order to save water, the cooling water is operated with higher concentration and lower flow rate. Under such operating conditions, the ionic component accompanying the evaporation of the cooling water may concentrate, and the scale may precipitate and adhere to the refrigerator. Microorganisms propagate in the cooling water, and slime may adhere to the refrigerator.
  • Heat transfer from the object to be cooled to the cooling water is hindered by the adhesion of dirt such as scale and slime.
  • the amount of the object to be cooled decreases; the pressure increases; the temperature of the object to be cooled increases, the load on the compressor increases, and the high pressure cut (the compressor stops at a certain level or more). ) May occur. Due to adhesion of dirt such as scale and slime, the refrigerating capacity is reduced and the power consumption is increased, so that the energy efficiency is lowered.
  • LTD temperature after cooling of the cooled object ⁇ cooling water outlet temperature
  • ATD temperature after cooling of the cooled object ⁇ cooling water inlet temperature The temperature after cooling of the cooled object is defined as the heat exchanger outlet temperature of the cooled object. Can be measured.
  • Patent Document 2 discloses that the LTD and ATD are corrected, and the corrected LTD value or corrected ATD value is compared with a reference value to obtain a heat exchanger. It is described that the dirt is evaluated.
  • the absolute value is affected by the thermometer mounting position, cooling machine specifications and model, etc.
  • it is necessary to collect and accumulate LTD, ATD, correction LTD, and correction ATD over the long term, and to grasp the dirt index due to the increasing tendency. Therefore, in order to grasp the increasing tendency of dirt, a period of at least about two weeks is required, and the period has been required to be shortened.
  • An object of the present invention is to provide a dirt evaluation method capable of obtaining dirt on a cooling water line of a refrigeration system with high accuracy.
  • the method for evaluating contamination of a cooling water line is a method for evaluating contamination in a refrigeration system including a condenser and an evaporator, wherein the contamination of the cooling water line in which cooling water is circulated through the condenser is evaluated.
  • the LTD of the condenser is measured, and the cooling water is based on the measurement result of the LTD when the load of the evaporator or the condenser is a predetermined value or more, or when the refrigerator is in steady operation. Evaluate line contamination.
  • the refrigeration system compresses the medium from the evaporator by the compressor and directs it to the condenser to condense, and introduces the condensed liquid into the evaporator through an expansion valve for evaporation. It is configured.
  • the load of the evaporator or the condenser is a temperature difference between a brine inlet temperature and a brine outlet temperature and a rated brine (sometimes cold water or cooling water) temperature. It is the ratio to the difference.
  • the brine outlet temperature T 2 extracts the LTD in the case where the predetermined temperature or less, to evaluate the contamination of the cooling water line based on the extracted LTD.
  • the LTD when the brine outlet temperature T 2 is equal to or lower than the predetermined temperature and (T 1 ⁇ T 2 ) / (rated brine temperature difference) is equal to or higher than the predetermined value is extracted and extracted.
  • the contamination of the cooling water line is evaluated based on the LTD.
  • the LTD when the difference T 4 -T 3 between the cooling water inlet temperature T 3 and the outlet temperature T 4 of the condenser is equal to or greater than a certain value is extracted, and based on the extracted LTD Evaluate dirt on the cooling water line.
  • an LTD is extracted when the current value or power value of the compressor is equal to or greater than a predetermined ratio of the rated current value or the rated power value, and the cooling water line is cleaned based on the extracted LTD. evaluate.
  • the pressure of the temperature T 6 or medium medium flowing into the condenser extracts LTD when a predetermined value or more, to evaluate the contamination of the cooling water line based on the extracted LTD .
  • an LTD-time graph is created by continuing plots so that the extracted LTD is continuous in the LTD-time graph, and the contamination of the cooling water line is evaluated from this graph.
  • Cooling water is passed through the cooling water line of the condenser, and this cooling water is cooled by a cooling tower or the like provided in the line. If the contamination of the cooling water line increases, the LTD of the condenser (T 5 -T 4 described later) increases, so that the LTD becomes an index value of the contamination.
  • the refrigerator starts and stops (start / stop)
  • the relation between the LTD and the contamination of the cooling water line is small when the refrigerator is in an unsteady state immediately after the start.
  • the load on the refrigerator is small, the heat exchange is not stable, so the correlation between the LTD and the contamination of the cooling water line is low. Therefore, in the present invention, the contamination state of the cooling water line is evaluated based on data when the load on the evaporator or the condenser is a predetermined value or more, or when the refrigerator is in steady operation.
  • the following effects can be obtained. 1) Based on the LTD at the time when the refrigerator is operated and heat exchange is performed stably, the heat exchange efficiency of the refrigerator can be accurately evaluated. 2) Adaptable to different driving loads depending on the season. 3) The trend of LTD can be easily understood. 4) It can be determined whether the change in LTD is due to a change in load or a change in efficiency. 5) When the refrigerant temperature rises, the LTD rises, but the rise in LTD is due to fouling, so the rate of rise is very slow. When the increase in LTD is rapid, it can be determined that only the refrigerant temperature is rising rapidly due to mechanical trouble.
  • FIG. 1 is a flowchart showing an example of a turbo compression refrigeration system.
  • the refrigerator 1 compresses a medium (for example, an HFC (hydrofluorocarbon) system, an HCFC (hydrochlorofluorocarbon) system, or a CFC (chlorofluorocarbon) system) with a turbo compressor 2, and guides it to a condenser 3 for condensation.
  • the cooling water cooled by the cooling tower 6 is circulated through the heat transfer tube (cooling coil) 3 a of the condenser 3 through the pump 7.
  • the difference T 5 -T 4 of the medium outlet temperature T 5 of the condenser 3 and the cooling water outlet temperature T 4 is LTD.
  • the temperatures T 1 to T 6 are measured by a temperature sensor.
  • the condensed liquid is introduced into the evaporator 5 through the expansion valve 4, evaporates and adiabatically expands, and cools the refrigerant (brine in this embodiment) flowing in the heat transfer coil 5a.
  • the steam is sent to the compressor 2 and compressed again.
  • the brine that has been heated by the heat exchanger in the load body 9 and passed through the heat transfer coil 5 a is passed through the pump 8, and the cooled cold brine is circulated through the load body 9.
  • a cooling water line is configured by the heat transfer tube 3a, the cooling tower 6, the pump 7, and the pipes 6A and 6B.
  • This cooling tower 6 has a casing (tower) 6a, an air inlet 6b provided on the side surface of the casing 6a, and a cooling water tank (pit) 6c provided at the bottom.
  • a filler 6d is accommodated in the casing 6a, and a cooling water sprinkling nozzle 6e is disposed above the filler 6d.
  • An opening 6g is provided at the top of the casing 6a, and a blower 6f is provided in the opening 6g.
  • the suction port of the pump 7 is connected to the vicinity of the bottom of the water tank 6c, and the discharge port of the pump 7 is connected to one end of the heat transfer tube (cooling coil) 3a via the cooling water forward piping 6A.
  • the other end of the heat transfer tube 3a is connected to a watering nozzle 6e of the cooling tower 6 via a cooling water return pipe 6B.
  • the water tank 6c is provided with a ball tap as a water level control means to which a water supply pipe for makeup water (ground water, tap water, industrial water, etc.) is connected, and the water level in the water tank 6c is set within a set range. It comes to hold.
  • a water supply pipe for makeup water ground water, tap water, industrial water, etc.
  • Ratio (T 1 -T 2 ) / (rated brine temperature difference) between the difference (T 1 -T 2 ) between the brine inlet temperature T 1 and the brine outlet temperature T 2 of the evaporator 5 and the rated brine temperature difference of the evaporator 5 ) Is the brine load.
  • FIG. 3 shows an example of the LTD of this system.
  • the LTD greatly varies depending on the start / stop of the refrigerator and the load fluctuation. Therefore, in this embodiment, the brine outlet temperature T 2 is below a predetermined temperature, and brine load to extract LTD where is above a predetermined value.
  • This predetermined value is preferably a value selected from 0.5 to 0.7.
  • extraction (filtering) of LTD data may be performed by any of the following methods i) to iv).
  • the difference T 4 -T 3 between the cooling water inlet temperature T 3 and the outlet temperature T 4 of the condenser 3 is a certain value or more, preferably T 4 -T 3 is the difference between the rated cooling water inlet temperature and the outlet temperature.
  • LTD is extracted when it is N% or more (N% is preferably 60% or more, more preferably 80% or more).
  • T 4 -T 3 is an index value for judging the stability of heat exchange. Generally, the higher the load, the more stable the heat exchange.
  • the brine outlet temperature T 2 is extracted LTD when more than a predetermined value.
  • the brine outlet temperature is an index value for the start / stop of the refrigerator. When the refrigerator is in steady operation, the brine outlet temperature is generally low. iii) Extract the LTD when the current value or power value of the compressor 2 is C% or more of the rated current value or rated power value (C% is preferably 60% or more, more preferably 80% or more). This current value or power value is an index value of the start / stop of the refrigerator, and becomes a predetermined value or more during steady operation. iv) Extract the LTD when the temperature T 6 (or the pressure of the medium) of the medium flowing into the condenser 3 is equal to or higher than a predetermined value. This temperature or pressure is an index value for start / stop, and becomes a predetermined value or more during steady operation.
  • the above description relates to a compression refrigerator, but the present invention can also be applied to an absorption refrigeration system having a regenerator using gas, fuel oil, steam or the like as a heat source.
  • the temperature data of T 1 to T 6 measured by the temperature measuring means 11 is accumulated in the temperature data accumulating means 12, and any of the above extraction methods is used, and the predetermined value is set to any value.
  • the filtering rule is input from the filtering (extraction) rule input unit 16 to the filtering rule storage unit 17. From the accumulated temperature data, the one that meets the extraction condition is extracted by the filtering unit 13, the LTD is calculated by the calculating unit 14, and presented by the presenting unit 15.
  • a commercially available data logger device may be applied, but a method in which collected data is stored in a server via the Internet and data can be confirmed via the Internet may be adopted. By using this method, it is possible to check the situation at the site even at a location away from the site.
  • FIG. 5 shows an LTD-time graph in which plots are continued by cutting data at the time of non-extraction so that the extracted LTD values are continuous. According to FIG. 5, it is possible to clearly know the fluctuation of the LTD value from which the data disturbance due to start / stop is removed.
  • the average value of LTD is 0.6 ° C. in the case of FIG. 3 including data in a stop or control transition period (for example, immediately after startup).
  • the average value of LTD is 2.9 ° C., and it can be seen that FIG. 5 is more suitable for the actual situation.
  • Fig. 6 shows a graph in which data taken at different times in this actual machine was extracted in the same manner and added with brine load data. As shown in FIG. 6, it is clear that LTD changes according to load.

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Abstract

The present invention provides a method for evaluating the cleanliness of a coolant line in a refrigeration system, in which it is possible to accurately determine the cleanliness of a coolant line in a refrigeration system. A refrigeration system having an absorption refrigerator having a compression refrigerator provided with a compressor (2), a condenser (3), and an evaporator (5), wherein the cleanliness of a coolant line through which coolant is circulated through and distributed in the condenser (3) is evaluated. The LTD of the condenser (3) is measured and the cleanliness of the coolant line is evaluated on the basis of the LTD measurement results when the load for the evaporator (5) or the condenser (3) is a specific value or higher or when the refrigerator is operating steadily.

Description

冷却水ラインの汚れ評価方法Dirt evaluation method for cooling water line
　本発明は、圧縮式冷凍機又は吸収式冷凍機を備えた冷凍システムの汚れを評価する方法に関するものである。本発明は、該冷凍機の凝縮器に冷却水を循環流通させるときの冷却水ラインの汚れを評価する方法に関するものである。 The present invention relates to a method for evaluating the fouling of a refrigeration system equipped with a compression refrigerator or an absorption refrigerator. The present invention relates to a method for evaluating contamination of a cooling water line when circulating cooling water through a condenser of the refrigerator.
　各種工場、ビル等では、冷凍機等の各種の熱交換器を含む水系が設けられ、冷却水と被冷却体とを熱交換器を介して接触させて、被冷却体を冷却（場合により潜熱を奪うのみのものも含む）している。ビル等に設けられた冷凍機では被冷却体としてフロンや水等の冷媒が用いられている。コンビナート等では各種熱交換器が使用され、被冷却体として、空気、油性物質、各種有機物が用いられている。 In various factories, buildings, etc., water systems including various heat exchangers such as refrigerators are provided, and cooling water and the object to be cooled are brought into contact with each other through the heat exchanger to cool the object to be cooled (in some cases, latent heat is used). Including those that only take away). In a refrigerator provided in a building or the like, a refrigerant such as chlorofluorocarbon or water is used as an object to be cooled. In a complex or the like, various heat exchangers are used, and air, an oily substance, and various organic substances are used as a body to be cooled.
　冷凍機等の熱交換器を含む系のうち、これら被冷却体の凝縮を伴うものは凝縮器と称され、被冷却体の凝縮を伴わないものは冷却器と称される。 Among the systems including a heat exchanger such as a refrigerator, those that are accompanied by condensation of the cooled object are referred to as condensers, and those that are not accompanied by condensation of the cooled object are referred to as coolers.
　以下においては、主に凝縮を伴う圧縮式冷凍機を例示して説明を行うが、本発明は圧縮式冷凍機に限らず、熱交換器全般に適用可能である。 In the following, a compression type refrigerator with condensation will be mainly described as an example. However, the present invention is not limited to the compression type refrigerator, and can be applied to general heat exchangers.
　冷却水系においては、節水を図るために、冷却水がより高濃縮、低流速で運転されるようになってきている。このような運転条件下では、冷却水の蒸発に伴うイオン成分が濃縮し、スケールが析出して冷凍機内に付着することがある。微生物が冷却水中で繁殖し、スライムが冷凍機内に付着することもある。 In the cooling water system, in order to save water, the cooling water is operated with higher concentration and lower flow rate. Under such operating conditions, the ionic component accompanying the evaporation of the cooling water may concentrate, and the scale may precipitate and adhere to the refrigerator. Microorganisms propagate in the cooling water, and slime may adhere to the refrigerator.
　スケールやスライム等の汚れの付着により、被冷却体から冷却水への伝熱が阻害される。これにより、凝縮器においては、被冷却体凝縮量が減少する；圧力が上昇する；被冷却体温度が上昇し、圧縮機の負荷が上昇し、高圧カット（一定以上で圧縮機が停止する。）に到る；等の事態が生じることがある。スケールやスライム等の汚れの付着により、冷凍能力が低下し、消費電力量が増加するため、エネルギー効率が低下する。 ∙ Heat transfer from the object to be cooled to the cooling water is hindered by the adhesion of dirt such as scale and slime. Thereby, in the condenser, the amount of the object to be cooled decreases; the pressure increases; the temperature of the object to be cooled increases, the load on the compressor increases, and the high pressure cut (the compressor stops at a certain level or more). ) May occur. Due to adhesion of dirt such as scale and slime, the refrigerating capacity is reduced and the power consumption is increased, so that the energy efficiency is lowered.
　このため、冷凍機においては、汚れの付着状況を正確に推定し、その状況に応じて、冷却水にスケール洗浄剤やスライム洗浄剤を適切に添加して、洗浄を行なう必要がある。 For this reason, in the refrigerator, it is necessary to accurately estimate the state of adhesion of dirt and perform cleaning by appropriately adding a scale cleaner or a slime cleaner to the cooling water according to the situation.
　特許文献１の通り、冷凍機の熱交換効率を知る指標として、Ｕ値（総括伝熱係数）や汚れ係数があるが、計算が煩雑である。Ｕ値（総括伝熱係数）や汚れ係数の単位は［℃］ではないため、これらの値のみから、直ちに高圧カットに到るか否かを判断することは難しい。この判断を行うためには、汚れが付着していない正常な状態での計測値が必要となる。 As disclosed in Patent Document 1, there are U value (overall heat transfer coefficient) and dirt coefficient as indices for knowing the heat exchange efficiency of the refrigerator, but the calculation is complicated. Since the unit of the U value (overall heat transfer coefficient) and the soil coefficient is not [° C.], it is difficult to determine whether or not the high pressure cut is reached immediately from these values alone. In order to make this determination, a measurement value in a normal state where dirt is not attached is necessary.
　このため、特許文献２に記載の通り、実際には、下記式で求められるＬＴＤ（Ｌｅａｖｉｎｇ　Ｔｅｍｐｅｒａｔｕｒｅ　Ｄｉｆｆｅｒｅｎｃｅ）やＡＴＤ（Ａｐｐｒｏａｃｈ　Ｔｅｍｐｅｒａｔｕｒｅ　Ｄｉｆｆｅｒｅｎｃｅ）が用いられている。 For this reason, as described in Patent Document 2, in practice, LTD (Leaving Temperature Difference) or ATD (Approach Temperature Difference) obtained by the following equation is used.
　　ＬＴＤ＝被冷却体の冷却後の温度－冷却水出口温度
　　ＡＴＤ＝被冷却体の冷却後の温度－冷却水入口温度
　被冷却体の冷却後の温度は、被冷却体の熱交換器出口温度として測定することができる。 LTD = temperature after cooling of the cooled object−cooling water outlet temperature ATD = temperature after cooling of the cooled object−cooling water inlet temperature The temperature after cooling of the cooled object is defined as the heat exchanger outlet temperature of the cooled object. Can be measured.
　圧縮式冷凍機では、熱交換が不十分になると被冷却体の冷却後の温度（この場合凝縮温度）が上昇し、一定レベルを超えると高圧カットを引き起こし、稼働不能となるため、ＬＴＤ，ＡＴＤで状況を判断することが可能である。上記２式から、ＡＴＤ＝ＬＴＤ＋（冷却水出口温度－冷却水入口温度）の関係式が得られ、これから求められるＡＴＤ（又はＬＴＤ）は温度を単位とするため、この温度と既知の被冷却体凝縮温度とを比較することにより、高圧カットが生じるか否かを直ちに判断することができる。 In a compression refrigerator, if the heat exchange becomes insufficient, the temperature after cooling of the object to be cooled (in this case, the condensation temperature) rises, and if it exceeds a certain level, it causes high-pressure cut and becomes inoperable. It is possible to judge the situation. From the above two formulas, a relational expression of ATD = LTD + (cooling water outlet temperature−cooling water inlet temperature) is obtained, and ATD (or LTD) obtained from this is in units of temperature. By comparing the condensation temperature, it can be immediately determined whether or not a high-pressure cut occurs.
　ＡＴＤ，ＬＴＤは、汚れの他に負荷変動の影響を強く受けることから、特許文献２には、ＬＴＤ，ＡＴＤを補正し、補正ＬＴＤ値又は補正ＡＴＤ値と基準値とを比較して熱交換器の汚れを評価することが記載されている。 Since ATD and LTD are strongly affected by load fluctuations in addition to dirt, Patent Document 2 discloses that the LTD and ATD are corrected, and the corrected LTD value or corrected ATD value is compared with a reference value to obtain a heat exchanger. It is described that the dirt is evaluated.
特開２００３－３２２４９４JP 2003-322494 A 特開平７－２１８１８８JP-A-7-218188
　熱交換器の汚れ状態を推定する指標値としてＬＴＤ，ＡＴＤおよび補正ＬＴＤ、補正ＡＴＤを用いる方法では、温度計の取り付け位置や冷却機械の仕様・型式等で絶対数値が影響を受けるため、汚れを評価するには、長期的にＬＴＤ，ＡＴＤおよび補正ＬＴＤ、補正ＡＴＤを収集・蓄積し、その増加傾向による、汚れ指標を把握する必要がある。そのため、汚れの増加傾向を把握するためには少なくとも２週間程度の期間が必要で、その期間短縮が求められていた。 In the method of using LTD, ATD, correction LTD, and correction ATD as index values for estimating the contamination state of the heat exchanger, the absolute value is affected by the thermometer mounting position, cooling machine specifications and model, etc. In order to evaluate, it is necessary to collect and accumulate LTD, ATD, correction LTD, and correction ATD over the long term, and to grasp the dirt index due to the increasing tendency. Therefore, in order to grasp the increasing tendency of dirt, a period of at least about two weeks is required, and the period has been required to be shortened.
　従来は、冷凍機の発停や負荷変動を考慮することなく汚れ状態を推定していたため、冷凍機の発停や負荷変動に起因したＬＴＤ、ＡＴＤ等の変動と汚れによるＬＴＤ、ＡＴＤ等の変動とがデータに混在することになり、汚れ判断の誤差が大きくなっていた。 Conventionally, since the dirt state is estimated without considering the start / stop of the refrigerator and the load fluctuation, the fluctuation of the LTD / ATD due to the start / stop of the refrigerator and the load fluctuation and the fluctuation of the LTD / ATD due to the dirt Will be mixed in the data, and the error of the dirt judgment was large.
　本発明は、冷凍システムの冷却水ラインの汚れを高精度に求めることができる汚れ評価方法を提供することを目的とする。 An object of the present invention is to provide a dirt evaluation method capable of obtaining dirt on a cooling water line of a refrigeration system with high accuracy.
　本発明の冷却水ラインの汚れ評価方法は、凝縮器及び蒸発器を備えた冷凍システムにおける汚れ評価方法であって、該凝縮器に冷却水を循環流通させる冷却水ラインの汚れを評価する方法において、該凝縮器のＬＴＤを計測し、該蒸発器又は凝縮器の負荷が所定値以上の場合であるか、又は該冷凍機が定常稼動している場合のＬＴＤの計測結果に基づいて前記冷却水ラインの汚れを評価する。 The method for evaluating contamination of a cooling water line according to the present invention is a method for evaluating contamination in a refrigeration system including a condenser and an evaporator, wherein the contamination of the cooling water line in which cooling water is circulated through the condenser is evaluated. The LTD of the condenser is measured, and the cooling water is based on the measurement result of the LTD when the load of the evaporator or the condenser is a predetermined value or more, or when the refrigerator is in steady operation. Evaluate line contamination.
　本発明の一態様では、冷凍システムは、蒸発器からの媒体を圧縮機によって圧縮して凝縮器に導き、凝縮させ、凝縮した液を膨張弁を介して該蒸発器に導入し、蒸発させるよう構成されている。 In one aspect of the present invention, the refrigeration system compresses the medium from the evaporator by the compressor and directs it to the condenser to condense, and introduces the condensed liquid into the evaporator through an expansion valve for evaporation. It is configured.
　本発明の冷却水ラインの汚れ評価方法の一態様では、前記蒸発器又は凝縮器の負荷は、ブライン入口温度とブライン出口温度との温度差と定格ブライン（冷水や冷却水のときもある）温度差との比である。 In one aspect of the method for evaluating contamination of a cooling water line of the present invention, the load of the evaporator or the condenser is a temperature difference between a brine inlet temperature and a brine outlet temperature and a rated brine (sometimes cold water or cooling water) temperature. It is the ratio to the difference.
　本発明の一態様では、ブライン出口温度Ｔ２が所定温度以下である場合のＬＴＤを抽出し、抽出されたＬＴＤに基づいて前記冷却水ラインの汚れを評価する。 In one aspect of the present invention, the brine outlet temperature T 2 extracts the LTD in the case where the predetermined temperature or less, to evaluate the contamination of the cooling water line based on the extracted LTD.
　本発明の一態様では、ブライン出口温度Ｔ２が所定温度以下であり、かつ（Ｔ１－Ｔ２）／（定格ブライン温度差）が所定値以上である場合のＬＴＤを抽出し、抽出されたＬＴＤに基づいて前記冷却水ラインの汚れを評価する。 In one aspect of the present invention, the LTD when the brine outlet temperature T 2 is equal to or lower than the predetermined temperature and (T 1 −T 2 ) / (rated brine temperature difference) is equal to or higher than the predetermined value is extracted and extracted. The contamination of the cooling water line is evaluated based on the LTD.
　本発明の一態様では、凝縮器の冷却水入口温度Ｔ３と出口温度Ｔ４との差Ｔ４－Ｔ３が一定値以上であるときのＬＴＤを抽出し、抽出されたＬＴＤに基づいて前記冷却水ラインの汚れを評価する。 In one aspect of the present invention, the LTD when the difference T 4 -T 3 between the cooling water inlet temperature T 3 and the outlet temperature T 4 of the condenser is equal to or greater than a certain value is extracted, and based on the extracted LTD Evaluate dirt on the cooling water line.
　本発明の一態様では、圧縮機の電流値又は電力値が定格電流値又は定格電力値の所定割合以上であるときのＬＴＤを抽出し、抽出されたＬＴＤに基づいて前記冷却水ラインの汚れを評価する。 In one aspect of the present invention, an LTD is extracted when the current value or power value of the compressor is equal to or greater than a predetermined ratio of the rated current value or the rated power value, and the cooling water line is cleaned based on the extracted LTD. evaluate.
　本発明の一態様では、凝縮器に流入する媒体の温度Ｔ６又は媒体の圧力が所定値以上であるときのＬＴＤを抽出し、抽出されたＬＴＤに基づいて前記冷却水ラインの汚れを評価する。 In one aspect of the present invention, the pressure of the temperature T 6 or medium medium flowing into the condenser extracts LTD when a predetermined value or more, to evaluate the contamination of the cooling water line based on the extracted LTD .
　本発明の一態様では、抽出したＬＴＤがＬＴＤ－時間グラフにおいて連続するようにプロットを連続させてＬＴＤ－時間グラフを作成し、このグラフから前記冷却水ラインの汚れを評価する。 In one aspect of the present invention, an LTD-time graph is created by continuing plots so that the extracted LTD is continuous in the LTD-time graph, and the contamination of the cooling water line is evaluated from this graph.
　凝縮器の冷却水ラインには冷却水が通水されており、この冷却水は該ラインに設けられた冷却塔などによって冷却される。冷却水ラインの汚れが増加してくると、凝縮器のＬＴＤ（後述のＴ５－Ｔ４）が増大するのでＬＴＤは汚れの指標値となる。 Cooling water is passed through the cooling water line of the condenser, and this cooling water is cooled by a cooling tower or the like provided in the line. If the contamination of the cooling water line increases, the LTD of the condenser (T 5 -T 4 described later) increases, so that the LTD becomes an index value of the contamination.
　ところが、冷凍機は発停（スタート・ストップ）するので、スタート直後の非定常状態にあるときには、ＬＴＤと冷却水ラインの汚れとの関連が小さくなっている。冷凍機の負荷が小さいときには、熱交換が安定しないので、ＬＴＤと冷却水ラインの汚れとの相関性が低くなっている。そこで、本発明では、蒸発器又は凝縮器の負荷が所定値以上の場合であるか、又は冷凍機が定常稼動している場合のデータに基づいて冷却水ラインの汚れ状態を評価する。 However, since the refrigerator starts and stops (start / stop), the relation between the LTD and the contamination of the cooling water line is small when the refrigerator is in an unsteady state immediately after the start. When the load on the refrigerator is small, the heat exchange is not stable, so the correlation between the LTD and the contamination of the cooling water line is low. Therefore, in the present invention, the contamination state of the cooling water line is evaluated based on data when the load on the evaporator or the condenser is a predetermined value or more, or when the refrigerator is in steady operation.
　本発明によれば、次の作用効果が奏される。
　１）　冷凍機が運転され、かつ、熱交換が安定して行われている時点でのＬＴＤに基づくことにより、冷凍機の熱交換効率の正確な評価が行える。
　２）　季節によって異なる運転負荷に対応できる。
　３）　ＬＴＤのトレンドが理解しやすくできる。
　４）　ＬＴＤの変化が負荷の変化によるものか、効率の変化によるものか判断できる。
　５）　冷媒温度が上昇するとＬＴＤが上昇するが、ＬＴＤの上昇はファウリングに起因するので上昇速度は極めて低速である。ＬＴＤの上昇が急速な場合は機械のトラブルにより冷媒温度のみが急速に上昇していると判断できる。 According to the present invention, the following effects can be obtained.
1) Based on the LTD at the time when the refrigerator is operated and heat exchange is performed stably, the heat exchange efficiency of the refrigerator can be accurately evaluated.
2) Adaptable to different driving loads depending on the season.
3) The trend of LTD can be easily understood.
4) It can be determined whether the change in LTD is due to a change in load or a change in efficiency.
5) When the refrigerant temperature rises, the LTD rises, but the rise in LTD is due to fouling, so the rate of rise is very slow. When the increase in LTD is rapid, it can be determined that only the refrigerant temperature is rising rapidly due to mechanical trouble.
圧縮式冷凍システムのフロー図である。It is a flowchart of a compression-type refrigeration system. データ処理のためのブロック図である。It is a block diagram for data processing. ＬＴＤを示すグラフである。It is a graph which shows LTD. 実施例の結果を示すＬＴＤの経時変化グラフである。It is a time-dependent graph of LTD which shows the result of an Example. 実施例の結果を示すＬＴＤの経時変化グラフである。It is a time-dependent graph of LTD which shows the result of an Example. 実施例の結果を示すＬＴＤの経時変化グラフである。It is a time-dependent graph of LTD which shows the result of an Example.
　以下、本発明についてさらに詳細に説明する。 Hereinafter, the present invention will be described in more detail.
　図１はターボ圧縮式冷凍システムの一例を示すフロー図である。冷凍機１は、ターボ式圧縮機２によって媒体（例えばＨＦＣ（ハイドロフルオロカーボン）系、ＨＣＦＣ（ハイドロクロロフルオロカーボン）系、ＣＦＣ（クロロフルオロカーボン）系）を圧縮し、凝縮器３に導き、凝縮させる。凝縮器３の伝熱管（冷却コイル）３ａには、冷却塔６で冷却された冷却水がポンプ７を介して循環通水される。凝縮器３の媒体出口温度Ｔ５と冷却水出口温度Ｔ４との差Ｔ５－Ｔ４がＬＴＤである。温度Ｔ1～Ｔ６は温度センサによって計測される。 FIG. 1 is a flowchart showing an example of a turbo compression refrigeration system. The refrigerator 1 compresses a medium (for example, an HFC (hydrofluorocarbon) system, an HCFC (hydrochlorofluorocarbon) system, or a CFC (chlorofluorocarbon) system) with a turbo compressor 2, and guides it to a condenser 3 for condensation. The cooling water cooled by the cooling tower 6 is circulated through the heat transfer tube (cooling coil) 3 a of the condenser 3 through the pump 7. The difference T 5 -T 4 of the medium outlet temperature T 5 of the condenser 3 and the cooling water outlet temperature T 4 is LTD. The temperatures T 1 to T 6 are measured by a temperature sensor.
　凝縮した液は、膨張弁４を介して蒸発器５に導入され、蒸発して断熱膨張し、伝熱コイル５ａ内を流れる冷媒（この実施の形態ではブライン）を冷却する。蒸気は圧縮機２に送られ、再び圧縮される。伝熱コイル５ａには、負荷体９で熱交換器して昇温したブラインがポンプ８を介して通液され、冷却された冷ブラインが負荷体９に循環通液される。伝熱管３ａ、冷却塔６、ポンプ７、及び配管６Ａ，６Ｂによって冷却水ラインが構成されている。 The condensed liquid is introduced into the evaporator 5 through the expansion valve 4, evaporates and adiabatically expands, and cools the refrigerant (brine in this embodiment) flowing in the heat transfer coil 5a. The steam is sent to the compressor 2 and compressed again. The brine that has been heated by the heat exchanger in the load body 9 and passed through the heat transfer coil 5 a is passed through the pump 8, and the cooled cold brine is circulated through the load body 9. A cooling water line is configured by the heat transfer tube 3a, the cooling tower 6, the pump 7, and the pipes 6A and 6B.
　この冷却塔６は、ケーシング（塔体）６ａと、ケーシング６ａの側面に設けられた空気流入口６ｂと、底部に設けられた冷却水の水槽（ピット）６ｃを有する。ケーシング６ａ内に充填材６ｄが収容され、充填材６ｄの上方に、冷却水の散水ノズル６ｅが配設されている。ケーシング６ａの頂部に開口６ｇが設けられ、この開口６ｇに送風機６ｆが設けられている。水槽６ｃの底部近傍にポンプ７の吸引口が接続され、ポンプ７の吐出口は、冷却水の往配管６Ａを介して伝熱管（冷却コイル）３ａの一端に連結されている。伝熱管３ａの他端は冷却水の戻り配管６Ｂを介して冷却塔６の散水ノズル６ｅに連結されている。 This cooling tower 6 has a casing (tower) 6a, an air inlet 6b provided on the side surface of the casing 6a, and a cooling water tank (pit) 6c provided at the bottom. A filler 6d is accommodated in the casing 6a, and a cooling water sprinkling nozzle 6e is disposed above the filler 6d. An opening 6g is provided at the top of the casing 6a, and a blower 6f is provided in the opening 6g. The suction port of the pump 7 is connected to the vicinity of the bottom of the water tank 6c, and the discharge port of the pump 7 is connected to one end of the heat transfer tube (cooling coil) 3a via the cooling water forward piping 6A. The other end of the heat transfer tube 3a is connected to a watering nozzle 6e of the cooling tower 6 via a cooling water return pipe 6B.
　図示は省略するが、水槽６ｃには、補給水（地下水、水道水、工業用水など）の給水配管が接続された、水位制御手段であるボールタップが設けられ、水槽６ｃ内の水位を設定範囲に保持するようになっている。 Although not shown in the drawing, the water tank 6c is provided with a ball tap as a water level control means to which a water supply pipe for makeup water (ground water, tap water, industrial water, etc.) is connected, and the water level in the water tank 6c is set within a set range. It comes to hold.
　蒸発器５のブライン入口温度Ｔ１とブライン出口温度Ｔ２との差（Ｔ１－Ｔ２）と蒸発器５の定格ブライン温度差との比（Ｔ１－Ｔ２）／（定格ブライン温度差）がブライン負荷である。 Ratio (T 1 -T 2 ) / (rated brine temperature difference) between the difference (T 1 -T 2 ) between the brine inlet temperature T 1 and the brine outlet temperature T 2 of the evaporator 5 and the rated brine temperature difference of the evaporator 5 ) Is the brine load.
　図３に、このシステムのＬＴＤの一例を示す。図３の通り、冷凍機の発停や負荷変動によってＬＴＤが大きくばらつく。そこで、この実施の形態では、ブライン出口温度Ｔ２が所定温度以下であり、かつブライン負荷が所定値以上である場合のＬＴＤを抽出する。この所定値は、０．５～０．７の間から選定された値であることが好ましい。このようにデータを抽出することにより、システムの発停や負荷変動によるＬＴＤが乱れたときのデータを取り除き、ＬＴＤによる冷却水ラインの汚れ評価精度を高めることができる。 FIG. 3 shows an example of the LTD of this system. As shown in FIG. 3, the LTD greatly varies depending on the start / stop of the refrigerator and the load fluctuation. Therefore, in this embodiment, the brine outlet temperature T 2 is below a predetermined temperature, and brine load to extract LTD where is above a predetermined value. This predetermined value is preferably a value selected from 0.5 to 0.7. By extracting the data in this way, it is possible to remove the data when the LTD is disturbed due to the start / stop of the system or load fluctuation, and to improve the accuracy of evaluating the contamination of the cooling water line by the LTD.
　本発明では、ＬＴＤデータの抽出（フィルタリング）を次のi）～iv）のいずれかの方式によって行ってもよい。
i）　凝縮器３の冷却水入口温度Ｔ３と出口温度Ｔ４との差Ｔ４－Ｔ３が一定値以上、望ましくはＴ４－Ｔ３が定格の冷却水入口温度と出口温度との差のＮ％以上（Ｎ％は好ましくは６０％以上より好ましくは８０％以上）であるときのＬＴＤを抽出する。なお、Ｔ４－Ｔ３は熱交換の安定性の判断の指標値となる。一般に、負荷が高いほど熱交換は安定する。
ii）　ブライン出口温度Ｔ２が所定値以下のときのＬＴＤを抽出する。ブライン出口温度は、冷凍機のスタート・ストップの指標値となる。冷凍機が定常運転されているときには、ブライン出口温度は一般に低くなる。
iii）　上記圧縮機２の電流値又は電力値が定格電流値又は定格電力値のＣ％以上（Ｃ％は好ましくは６０％以上より好ましくは８０％以上）であるときのＬＴＤを抽出する。この電流値又は電力値は、冷凍機のスタート・ストップの指標値であり、定常運転中には、所定値以上となる。
iv）　凝縮器３に流入する媒体の温度Ｔ６（又は媒体の圧力）が所定値以上であるときのＬＴＤを抽出する。この温度又は圧力はスタート・ストップの指標値であり、定常運転中には所定値以上となる。 In the present invention, extraction (filtering) of LTD data may be performed by any of the following methods i) to iv).
i) The difference T 4 -T 3 between the cooling water inlet temperature T 3 and the outlet temperature T 4 of the condenser 3 is a certain value or more, preferably T 4 -T 3 is the difference between the rated cooling water inlet temperature and the outlet temperature. LTD is extracted when it is N% or more (N% is preferably 60% or more, more preferably 80% or more). T 4 -T 3 is an index value for judging the stability of heat exchange. Generally, the higher the load, the more stable the heat exchange.
ii) the brine outlet temperature T 2 is extracted LTD when more than a predetermined value. The brine outlet temperature is an index value for the start / stop of the refrigerator. When the refrigerator is in steady operation, the brine outlet temperature is generally low.
iii) Extract the LTD when the current value or power value of the compressor 2 is C% or more of the rated current value or rated power value (C% is preferably 60% or more, more preferably 80% or more). This current value or power value is an index value of the start / stop of the refrigerator, and becomes a predetermined value or more during steady operation.
iv) Extract the LTD when the temperature T 6 (or the pressure of the medium) of the medium flowing into the condenser 3 is equal to or higher than a predetermined value. This temperature or pressure is an index value for start / stop, and becomes a predetermined value or more during steady operation.
　上記説明は圧縮式冷凍機に関するものであるが、ガス、燃料油や蒸気などを熱源とした再生器を有する吸収式冷凍システムの場合にも本発明を適用できる。 The above description relates to a compression refrigerator, but the present invention can also be applied to an absorption refrigeration system having a regenerator using gas, fuel oil, steam or the like as a heat source.
　上記のうちのいずれの抽出方式を採用するか、また上記の所定値をどのような値とするかは、オペレータの経験及び試行によって定めるのが好ましい。 It is preferable to determine which of the above extraction methods should be adopted and what value the above-mentioned predetermined value should be based on the experience and trial of the operator.
　これまでに述べた手順を行う具体的方法として、図２に示すシステムで行うことが好ましい。 It is preferable to use the system shown in FIG. 2 as a specific method for performing the procedure described so far.
　図２の通り、温度計測手段１１で計測したＴ１～Ｔ６の温度データを温度データ蓄積手段１２に蓄積すると共に、上記のいずれの抽出方式とするか、また所定値をどのような値にするかについてフィルタリング（抽出）規則入力手段１６からフィルタリング規則記憶手段１７に入力する。蓄積した温度データから、抽出条件に適うものをフィルタリング手段１３で抽出し、ＬＴＤを算出手段１４で算出し、提示手段１５で提示する。 As shown in FIG. 2, the temperature data of T 1 to T 6 measured by the temperature measuring means 11 is accumulated in the temperature data accumulating means 12, and any of the above extraction methods is used, and the predetermined value is set to any value. The filtering rule is input from the filtering (extraction) rule input unit 16 to the filtering rule storage unit 17. From the accumulated temperature data, the one that meets the extraction condition is extracted by the filtering unit 13, the LTD is calculated by the calculating unit 14, and presented by the presenting unit 15.
　データ蓄積方法としては、市販のデータロガー装置を適用してもよいが、収集したデータをインターネット経由でサーバーに蓄積し、インターネット経由でデータ確認できる方式を採用してもよい。この方式を用いることにより、現場から離れている場所にいても現場の状況を確認することが可能である。 As a data storage method, a commercially available data logger device may be applied, but a method in which collected data is stored in a server via the Internet and data can be confirmed via the Internet may be adopted. By using this method, it is possible to check the situation at the site even at a location away from the site.
　図１に示す圧縮式冷凍機の実機を夏季（７月１３日～９月１１日）の間運転し、ＬＴＤを測定した。結果を図３に示す。図３の通り冷凍機の発停及び負荷変動により、ＬＴＤが－７～＋３℃の範囲にばらついている。そこで、ブライン温度１１．５℃以下、ブライン負荷０．６以上のときのＬＴＤのみを抽出して図４に示した。抽出したＬＴＤ値が、連続するように非抽出時のデータをカットしてプロットを連続させたＬＴＤ－時間グラフを図５に示す。図５によれば、発停によるデータ乱れを除去したＬＴＤ値の変動を明確に知ることができる。 The actual compressor refrigerator shown in FIG. 1 was operated during the summer (July 13th to September 11th), and the LTD was measured. The results are shown in FIG. As shown in FIG. 3, the LTD varies in the range of −7 to + 3 ° C. due to the start / stop of the refrigerator and the load fluctuation. Therefore, only LTD when the brine temperature is 11.5 ° C. or less and the brine load is 0.6 or more is extracted and shown in FIG. FIG. 5 shows an LTD-time graph in which plots are continued by cutting data at the time of non-extraction so that the extracted LTD values are continuous. According to FIG. 5, it is possible to clearly know the fluctuation of the LTD value from which the data disturbance due to start / stop is removed.
　図３，図５を対比すると、停止時や制御過渡期（例えば起動直後）にあるデータを含む図３の場合、ＬＴＤの平均値は０．６℃となる。一方、稼働時かつ熱交換効率が安定しているときのデータを抽出した図５ではＬＴＤの平均値が２．９℃となっており、図５の方が実態に合っていることが分かる。 3 and FIG. 5, the average value of LTD is 0.6 ° C. in the case of FIG. 3 including data in a stop or control transition period (for example, immediately after startup). On the other hand, in FIG. 5 in which data when the heat exchange efficiency is stable during operation is extracted, the average value of LTD is 2.9 ° C., and it can be seen that FIG. 5 is more suitable for the actual situation.
　この実機における別の時期に採ったデータを同様に抽出処理し、ブライン負荷データを加えて表示したグラフを図６に示す。図６の通り、ＬＴＤが負荷に応じて変化することが明らかである。 Fig. 6 shows a graph in which data taken at different times in this actual machine was extracted in the same manner and added with brine load data. As shown in FIG. 6, it is clear that LTD changes according to load.
　本発明を特定の態様を用いて詳細に説明したが、本発明の意図と範囲を離れることなく様々な変更が可能であることは当業者に明らかである。
　本出願は、２０１４年３月６日付で出願された日本特許出願２０１４－０４４１３１に基づいており、その全体が引用により援用される。 Although the present invention has been described in detail using specific embodiments, it will be apparent to those skilled in the art that various modifications can be made without departing from the spirit and scope of the invention.
This application is based on Japanese Patent Application No. 2014-044131 filed on Mar. 6, 2014, which is incorporated by reference in its entirety.
　１　冷凍機
　２　圧縮機
　３　凝縮器
　４　膨張弁
　５　蒸発器 1 Refrigerator 2 Compressor 3 Condenser 4 Expansion Valve 5 Evaporator

Claims (9)

  1. 　凝縮器及び蒸発器を備えた冷凍システムにおける汚れ評価方法であって、
    　該凝縮器に冷却水を循環流通させる冷却水ラインの汚れを評価する方法において、
    　該凝縮器のＬＴＤを計測し、
    　該蒸発器又は凝縮器の負荷が所定値以上の場合であるか、又は該冷凍機が定常稼動している場合のＬＴＤの計測結果に基づいて前記冷却水ラインの汚れを評価することを特徴とする冷却水ラインの汚れ評価方法。     A method for evaluating dirt in a refrigeration system including a condenser and an evaporator,
    In the method for evaluating the contamination of the cooling water line for circulating cooling water through the condenser,
    Measure the LTD of the condenser,
    The contamination of the cooling water line is evaluated based on the measurement result of the LTD when the load of the evaporator or the condenser is a predetermined value or more, or when the refrigerator is in steady operation. To evaluate the contamination of the cooling water line.
  2. 　請求項１において、前記蒸発器又は凝縮器の負荷は、ブライン入口温度Ｔ１とブライン出口温度Ｔ２との温度差（Ｔ１－Ｔ２）と定格ブライン温度差との比（Ｔ１－Ｔ２）／（定格ブライン温度差）であることを特徴とする冷却水ラインの汚れ評価方法。 4. The evaporator or condenser load according to claim 1, wherein the load of the evaporator or condenser is a ratio (T 1 −T 2 ) of a temperature difference (T 1 −T 2 ) between a brine inlet temperature T 1 and a brine outlet temperature T 2 to a rated brine temperature difference. 2 ) / (Evaluation method for contamination of cooling water line), characterized in that it is (rated brine temperature difference).
  3. 　請求項１において、ブライン出口温度Ｔ２が所定温度以下であり、かつ（Ｔ１－Ｔ２）／（定格ブライン温度差）が所定値以上である場合のＬＴＤを抽出し、抽出されたＬＴＤに基づいて前記冷却水ラインの汚れを評価することを特徴とする冷却水ラインの汚れ評価方法。 In Claim 1, the LTD when the brine outlet temperature T 2 is equal to or lower than the predetermined temperature and (T 1 -T 2 ) / (rated brine temperature difference) is equal to or higher than the predetermined value is extracted. A method for evaluating contamination of a cooling water line, comprising evaluating contamination of the cooling water line based on the method.
  4. 　請求項１において、凝縮器の冷却水入口温度Ｔ３と出口温度Ｔ４との差Ｔ４－Ｔ３が一定値以上であるときのＬＴＤを抽出し、抽出されたＬＴＤに基づいて前記冷却水ラインの汚れを評価することを特徴とする冷却水ラインの汚れ評価方法。 2. The LTD when the difference T 4 -T 3 between the cooling water inlet temperature T 3 and the outlet temperature T 4 of the condenser is equal to or greater than a certain value is extracted, and the cooling water is extracted based on the extracted LTD. A method for evaluating contamination of a cooling water line, characterized by evaluating contamination of the line.
  5. 　請求項１において、ブライン出口温度Ｔ２が所定温度以下である場合のＬＴＤを抽出し、抽出されたＬＴＤに基づいて前記冷却水ラインの汚れを評価することを特徴とする冷却水ラインの汚れ評価方法。 In claim 1, the brine outlet temperature T 2 extracts the LTD in the case where the predetermined temperature or less, contamination assessment of cooling water lines, characterized in that to evaluate the contamination of the cooling water line based on the extracted LTD Method.
  6. 　請求項１において、前記冷凍システムは、蒸発器からの媒体を圧縮機によって圧縮して凝縮器に導き、凝縮させ、凝縮した液を膨張弁を介して該蒸発器に導入し、蒸発させるよう構成されていることを特徴とする冷却水ラインの汚れ評価方法。 2. The refrigeration system according to claim 1, wherein the refrigeration system compresses the medium from the evaporator by the compressor, guides the condensed medium to the condenser, condenses, introduces the condensed liquid into the evaporator through an expansion valve, and evaporates the condensed liquid. A method for evaluating the contamination of a cooling water line.
  7. 　請求項６において、前記圧縮機の電流値又は電力値が定格電流値又は定格電力値の所定割合以上であるときのＬＴＤを抽出し、抽出されたＬＴＤに基づいて前記冷却水ラインの汚れを評価することを特徴とする冷却水ラインの汚れ評価方法。 7. The method according to claim 6, wherein an LTD when the current value or power value of the compressor is equal to or greater than a predetermined ratio of the rated current value or the rated power value is extracted, and contamination of the cooling water line is evaluated based on the extracted LTD. A method for evaluating the contamination of a cooling water line.
  8. 　請求項１において、前記凝縮器に流入する媒体の温度Ｔ６又は媒体の圧力が所定値以上であるときのＬＴＤを抽出し、抽出されたＬＴＤに基づいて前記冷却水ラインの汚れを評価することを特徴とする冷却水ラインの汚れ評価方法。 In claim 1, the pressure of the temperature T 6 or medium medium flowing into the condenser extracts LTD when a predetermined value or more, to evaluate the contamination of the cooling water line based on the extracted LTD A method for evaluating the contamination of a cooling water line.
  9. 　請求項３ないし８のいずれか１項において、抽出したＬＴＤがＬＴＤ－時間グラフにおいて連続するようにプロットを連続させてＬＴＤ－時間グラフを作成し、このグラフから前記冷却水ラインの汚れを評価することを特徴とする冷却水ラインの汚れ評価方法。 9. The plot according to claim 3, wherein plots are continued so that the extracted LTD is continuous in the LTD-time graph, and the contamination of the cooling water line is evaluated from this graph. A method for evaluating the contamination of a cooling water line.
PCT/JP2015/069622 2015-07-08 2015-07-08 Method for evaluating cleanliness of coolant line WO2017006455A1 (en)

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CN106642857A (en) * 2017-01-09 2017-05-10 中国工程物理研究院材料研究所 System and method for controlling cooling tower fan by using thermodynamic properties of refrigerant
CN109253555A (en) * 2017-07-12 2019-01-22 荏原冷热系统株式会社 Compression refrigerating machine
CN113390161A (en) * 2020-03-12 2021-09-14 青岛海尔空调电子有限公司 Air-cooled heat pump hot water air conditioning unit and control method thereof
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CN115235052A (en) * 2022-07-27 2022-10-25 广州市铭汉科技股份有限公司 Automatic adjusting control system of water chiller

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