CN111263922A - Water temperature control method and system - Google Patents

Abstract

It is possible to provide a system capable of reducing the amount of heating and/or cooling heat at the delivery source and utilizing the amount of heating and/or cooling heat at the destination as simply as possible. A pure water temperature control system (1) is provided with: a pure water production apparatus (10); a pure water utilization device (20); an outdoor piping (30) for sending pure water from the pure water production facility (10) to the pure water utilization facility; and a delivery source temperature control device (40) which controls the delivery source of the pure water to a delivery source target temperature. A data processing server (413) constructs a model for predicting a UA value from past meteorological data around an outdoor pipe and past operation performance data such as water temperature and flow rate, and calculates the UA predicted value by inputting the latest meteorological data and operation data around the outdoor pipe to the model. A heating temperature determination device (42) acquires a delivery source target temperature of the pure water from the UA predicted value and the use destination target temperature of the pure water. The heating temperature determining device (42) may be a device that determines both the heating temperature and the cooling temperature.

Description

Water temperature control method and system

technical field

The invention relates to a water temperature control method and system. More specifically, the present invention relates to a delivery device for controlling a use destination temperature (pipe outlet temperature) within a fixed range in a factory in which a water treatment facility and a facility for treating water using the water treatment facility are different from each other. A method and apparatus for controlling source temperature (pipe inlet temperature).

Background technique

Conventionally, a technique for controlling the temperature of pure water produced by a pure water production apparatus within a fixed range has been provided.

For example, Patent Document 1 discloses a method for producing pure water by passing raw water whose temperature has been controlled by a heat exchanger through a reverse osmosis membrane separation apparatus to produce pure water. The raw water is supplied to the receiving tank by controlling the water level to be fixed, and the temperature of the raw water in the receiving tank is detected. The temperature of the raw water is controlled to be fixed, and the raw water is fed from the receiving tank to the reverse osmosis membrane separation device. According to the structure described in Patent Document 1, the raw water in the receiving tank is circulated through the heat exchanger according to the temperature of the raw water in the receiving tank provided in the previous stage of the reverse osmosis membrane separation apparatus, and the water level in the receiving tank is The temperature of the treated water (pure water) produced by the reverse osmosis membrane separation device can be stably stabilized and fixed with high precision even if the usage amount of the produced treated water (pure water) varies greatly. temperature.

If the distance between the place where pure water is produced and the place where pure water is used is short, no particular problem will arise even if the method described in Patent Document 1 is adopted. However, in a manufacturing plant of precision electronic equipment, etc., a pure water manufacturing facility that produces pure water and a pure water utilization facility that utilizes pure water may be connected by outdoor piping having a length of about 0.5 km to 3 km. In this case, heat dissipation or heat absorption may occur on the surface of the pipe through which the pure water flows, and the temperature of the pure water may change in the pipe.

For temperature management of pure water, what is important is the temperature of the pure water at the place of use, not the temperature of the pure water at the place of manufacture. Therefore, a technique has been sought in which the temperature of the pure water may change during the water supply when the pure water is transported from the production site to the utilization site even if the distance between the pure water production site and the pure water utilization site is long. Even in the case of , the temperature of pure water at the destination can be kept constant.

FIG. 4 is a block diagram showing an example of a pure water temperature control system 100 in a factory where pure water production facilities and pure water utilization facilities are located in separate locations from each other.

In the pure water production apparatus 111 in the pure water production facility 110 , pure water is produced based on industrial water or the like, and the pure water is stored in the pure water tank 112 in the pure water production facility 110 .

Pure water is sent from the pure water production facility 110 to the pure water utilization facility 120 . An outdoor piping 130 for conveying pure water is provided between the pure water production facility 110 and the pure water utilization facility 120 . The length of the outdoor piping 130 is about 0.5 km to 3 km.

The pure water stored in the pure water receiving tank 121 in the pure water utilization facility 120 is cooled to a predetermined temperature by a cooler (a heat exchanger with cold water) 122 . In particular, when the destination of use is a manufacturing plant of precision electronic equipment, it is necessary to strictly control the temperature of pure water at the destination of use within a range of the prescribed temperature ±0.5°C. In addition, in order to cool to a predetermined temperature, the flow rate of the cold water passing through the cooler 122 is often adjusted.

For example, when the temperature of the industrial water supplied to the pure water production facility 110 is higher than a predetermined temperature when the pure water is used in the pure water utilization facility 120 as in summer, it is not necessary to install a pure water tank provided in the pure water production facility 110 In 112, the pure water produced by the pure water production apparatus 111 is heated by steam. However, when the temperature of the industrial water supplied to the pure water production facility 110 is lower than the predetermined temperature when pure water is used in the pure water utilization facility 120 as in winter, it is necessary to use the steam heater 113 for the production of pure water. The pure water produced by the device 111 is heated by steam.

For example, in winter, when the allowable temperature range of the pure water destination is 24°C±0.5°C, the piping inlet temperature at the thermometer 114 is set to 25.0°C in consideration of heat dissipation from the surface of the water supply piping. At this time, the temperature of the pure water receiving tank 121 is about 24.4° C. to 24.9° C. due to heat dissipation from the surface of the outdoor piping 130 . The water temperature is controlled to 24.0° C. by cooling it by the cooler 122 , and then supplied to the purpose of pure water use. land.

From the viewpoint of energy saving, this conventional method has problems. Originally, only the heat radiated from the surface of the outdoor piping 130 should be considered for steam heating using the steam heater 113 . In addition, cooling by the cooler 122 installed in the pure water utilization facility 120 can also be said to be a waste of energy.

Even so, if the heating temperature setting value in the steam heater 113 is merely lowered from 25.0°C to, for example, 24.5°C, there is a possibility that the allowable temperature range at the destination of pure water cannot be satisfied. Although the outdoor piping 130 is wrapped with a heat insulating material, even in this case, the pure water temperature may drop by about 1°C due to heat dissipation, especially in strong winds. It can be said that reducing the heating temperature setting value of the steam heater 113 is not sufficient easy.

As a technique for keeping the temperature of pure water at the destination constant, Patent Document 2 discloses the following: periodically collecting the energy usage amount P _W1 of the heat source device 1 , the energy usage amount P _W2 of the cooling and hot water pump 2 , and the energy consumption from the heat source device 1 The actual value of the water supply temperature T _S and the outside air temperature t _out of the cold and hot water, the actual value of the collected parameters is plotted in a multi-dimensional space, and a response surface model is created using the technology of RSM-S, and the created response surface model is used. to determine the optimal water delivery temperature TS _sp with minimum energy usage.

prior art literature

Patent Literature

Patent Document 1: Japanese Patent Laid-Open No. 2008-212834

Patent Document 2: Japanese Patent Laid-Open No. 2010-236786

SUMMARY OF THE INVENTION

Invention to solve problem

However, in the technique described in Patent Document 2, a response surface model is used, and it is expected that the optimum water supply temperature TS _sp can be controlled more simply.

The present invention has been made in view of such a problem, and its problem is to provide a method that can reduce the heating heat and/or cooling heat at the sending source and utilize the heating heat and/or cooling heat at the destination as easily as possible and achieve energy saving , cost-saving system.

solution to the problem

In order to solve the above-mentioned problems, the inventors of the present invention have found through repeated studies that a method for predicting the total heat transfer coefficient and heat transfer coefficient of outdoor piping based on past weather data around the outdoor piping and past operation performance data such as water temperature and flow rate is constructed. The present invention has been accomplished by using a model of the UA value of the product of the thermal area so that the target temperature of the output source can be set by inputting the latest weather data and operation data into the model, thereby solving the above problems. Specifically, the present invention provides the following solutions.

(1) The present invention is a water temperature control method in which, in the process of supplying treated water whose temperature has been adjusted by a water treatment facility to a destination of use of the treated water through an outdoor pipe, a method for controlling the temperature according to the past around the outdoor pipe is constructed. A model that predicts the UA value, which represents the product of the total heat transfer coefficient and the heat transfer area of the outdoor piping, by inputting the latest weather data and operating data into the above The model calculates a predicted UA value, calculates the target temperature of the outgoing source of the treated water based on the predicted UA value and the target temperature of the utilization destination of the treated water, and adjusts the heating unit and/or cooling of the treated water according to the target temperature of the outgoing source supply heat to the unit.

(2) Further, in the present invention, according to the water temperature control method described in (1), the target temperature of the delivery source is calculated by the following equation.

Delivery source target temperature = outside air temperature + (use destination target temperature - outside air temperature) × EXP {UA determination value / (water flow rate in outdoor piping × water specific heat)}

(3) Further, in the present invention, according to the water temperature control method according to (1) or (2), the UA determination value is obtained by inputting the latest weather data and operation data into the model, and then comparing the input by The obtained UA predicted value is calculated by adding a predetermined margin value.

(4) Further, in the present invention, according to the water temperature control method described in (3), the margin value is calculated by the following equation.

Margin value = safety factor × (standard deviation of the measured value of UA)

Here, the safety factor is a constant greater than 0 and 5 or less.

(5) Further, in the present invention, according to the method according to any one of (1) to (4), the model is a multiple regression model.

(6) Further, in the present invention, according to the method according to any one of (1) to (4), the model is an artificial intelligence model.

(7) In addition, the present invention is a model construction device for constructing a model based on past weather data and water temperature around an outdoor pipe that sends the treated water from a water treatment facility having a water temperature adjustment function to a treated water utilization facility. A model for predicting the UA value, which represents the product of the total heat transfer coefficient and the heat transfer area of the outdoor piping, based on past operation performance data such as flow rate.

(8) In addition, the present invention is a water temperature control system comprising: a water treatment facility having a water temperature adjustment function; a treated water utilization facility; an outdoor pipe for supplying water from the water treatment facility to the treated water utilization facility; and A sending source temperature control device for controlling the treated water to a sending source target temperature, wherein the sending source temperature control device includes a model building unit for building based on past weather data around the outdoor piping and water temperature, A model for predicting the UA value, which represents the product of the total heat transfer coefficient and the heat transfer area of the outdoor piping, based on past operational performance data such as flow rate, and a UA value prediction unit that inputs the latest weather data into the model and operation data to obtain a UA predicted value; a delivery source target temperature calculation unit that obtains a delivery source target temperature based on the UA predicted value and the utilization destination target temperature of the treated water; and a temperature control unit that controls the treated water to The sending out source target temperature.

effect of invention

According to the present invention, it is possible to construct a model for predicting the UA value representing the product of the total heat transfer coefficient and the heat transfer area of the outdoor piping from past weather data around the outdoor piping and past operational performance data such as water temperature and flow rate. The output target temperature is set by inputting the most recent weather data and operational data into the model. Thereby, the amount of heat radiated from the surface of the outdoor piping is estimated, and it is no longer necessary to set the target temperature of the delivery source to be higher than the target temperature of the treatment water use destination. Therefore, according to the present invention, it is possible to easily provide a method and system that can reduce the amount of heat supplied to the heating unit and/or the cooling unit at the delivery source, and achieve energy saving and cost saving.

Description of drawings

FIG. 1 is a schematic diagram showing a schematic configuration of a pure water temperature control system 1 according to the present embodiment.

FIG. 2 is a block diagram for explaining the functional configuration of the sending source temperature control device 40 provided in the water temperature control system 1 .

FIG. 3 is an example of the order distribution of the actual measurement value of the UA value.

FIG. 4 is a schematic diagram showing a schematic configuration of a conventional pure water temperature control system 100 .

Detailed ways

Hereinafter, specific embodiments of the present invention will be described in detail, but the present invention is not limited to the following embodiments at all, and the present invention can be implemented with appropriate modifications within the scope of the object of the present invention.

<Outline structure of water temperature control system>

FIG. 1 is a schematic diagram showing a schematic configuration of a water temperature control system according to the present embodiment.

Hereinafter, for simplicity, the treated water of the water treatment facility will be described as pure water and the water temperature control system as a pure water temperature control system, but the intention is not to limit the treated water to pure water. The pure water may be ultrapure water or so-called functional cleaning water obtained by dissolving gases such as hydrogen, ozone, and carbon dioxide in ultrapure water.

The pure water temperature control system 1 includes: a pure water production facility 10 for producing pure water based on industrial water; a pure water utilization facility 20 for using the pure water produced by the pure water production facility 10; and an outdoor piping 30 for producing pure water from the pure water The manufacturing facility 10 sends out pure water to the pure water utilization facility; and the sending source temperature control device 40 controls the sending source of the pure water to the sending source target temperature. The pure water production facility 10 , the pure water utilization facility 20 , and the delivery source temperature control device 40 are electrically connected to each other through a communication network 50 .

[Pure water production equipment 10]

The pure water production facility 10 includes a pure water production apparatus 11 that produces pure water based on industrial water, and a pure water tank 12 that stores the pure water produced by the pure water production apparatus 11 .

For example, when the pure water utilization facility 20 is a precision electronic device manufacturing plant, the pure water temperature at the utilization destination is strictly controlled within a range of the prescribed temperature ±0.5°C.

For example, when the temperature of the industrial water supplied to the pure water production facility 10 is higher than the predetermined temperature when pure water is used in the pure water utilization facility 20 as in summer, it is not necessary to set the pure water tank 12 to the pure water production apparatus. 11. The pure water produced is heated by steam. However, when the temperature of the industrial water supplied to the pure water production facility 10 is lower than the predetermined temperature when pure water is used in the pure water utilization facility 20 as in winter, it is necessary to control the pure water produced by the pure water production apparatus 11. Perform steam heating.

In order to steam the pure water produced by the pure water production apparatus 11 , the pure water production facility 10 is further provided with a steam heater 13 .

In addition, in order to appropriately control the target temperature of the delivery source of the pure water, a delivery source thermometer 14 is provided on the outlet side of the pure water tank 12 .

[Pure water utilization equipment 20]

The pure water utilization facility 20 includes: a pure water receiving tank 21 that receives pure water sent from the pure water tank 12 through the outdoor piping 30; Cool pure water at the specified temperature when using pure water.

In addition, in order to appropriately control the use-destination temperature of the pure water, a use-destination thermometer 23 is provided on the inlet side of the pure water receiving tank.

[Outdoor piping 30]

The length of the outdoor piping 30 is not particularly limited, but the length of the outdoor piping 130 is approximately 0.5 km to 3 km.

[Sending source temperature control device 40]

The hardware configuration and software configuration of the transmission source temperature control device 40 will be described with reference to FIG. 2 .

The transmission source temperature control device 40 includes: a UA value information processing device 41 that processes information on a UA value representing the product of the total heat transfer coefficient and the heat transfer area of the outdoor piping 30; and a heating temperature determination device 42 that The heating temperature of the steam heater 13 provided in the pure water production facility 10 is determined. The UA value information processing device 41 and the heating temperature determination device 42 are electrically connected via a communication network 43 .

[UA information processing device 41]

The UA information processing device 41 includes a data input server 411 that inputs information transmitted through the communication network 50 and performs writing processing to a database, and a database 412 that records all operation data and weather data at regular intervals and a data processing server 413, which reads out part or all of the data recorded in the database 412 to perform arithmetic processing and model building.

The data processing server 413 is configured as a control device including a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), and the like. The data processing server 413 constructs a UA value prediction model by reading predetermined data stored in the database 412 and executing an internal program.

The data processing server 413 executes the following processing.

[Construction of UA Value Prediction Model]

The data processing server 413 constructs a model for predicting the UA value representing the total heat transfer coefficient and the heat transfer area of the outdoor piping 30 from past weather data around the outdoor piping and past operational performance data such as water temperature and flow rate. accumulation.

Next, the prediction model of the UA value will be described. The amount of heat radiated from the surface of the outdoor piping 30 q is represented by the following two equations.

[Formula 1]

q=WC(T _in -T _out ) (1)

[Equation 2]

q=UA(ΔT) _lm (2)

In Formula (1), W is the flow rate (kg/s) of the pure water flowing in the outdoor piping 30 , and C is the specific heat (kJ/kg·°C) of the pure water flowing in the outdoor piping 30 . T _in is the delivery source temperature (° C.) measured by the delivery source thermometer 14 , and T _out is the usage destination temperature (° C.) measured by the usage destination thermometer 23 .

In Formula (2), U is the total heat transfer coefficient (kW/m ² ·° C.) of the outdoor piping 30 , and A is the heat transfer area (m ² ) of the outdoor piping 30 . (ΔT) _lm is the log mean temperature difference (°C).

UA is the product of the total heat transfer coefficient and the heat transfer area of the outdoor piping 30 , and is an index showing the ease of heat dissipation of the outdoor piping 30 . The larger the value of UA, the larger the difference between T _in and T _out .

Here, the logarithmic mean temperature difference (ΔT) _lm is represented by the following equation.

[Equation 3]

T _in is the delivery source temperature (° C.) measured by the delivery source thermometer 14 , and T _out is the usage destination temperature (° C.) measured by the usage destination thermometer 23 . In addition, T ₀ is the temperature (° C.) of the outside air.

From formulae (1) to (3), the following formulae are obtained.

[Equation 4]

The data input server 411 acquires measurement data of the outside air temperature T ₀ , the sending source temperature T _in , the use destination temperature T _out , and the sending water flow rate W at regular intervals (eg, every 1 minute) through the communication network 50 . Then, the data processing unit 411 records the acquired data in the database 412 together with the meteorological data (wind speed, wind direction, air temperature, humidity, sunshine, precipitation, etc.) around the outdoor piping 30 . Weather data can be acquired using commercially available weather observation devices (devices that integrate weather sensors such as temperature/humidity sensors, anemometers, pyranometers, and rain gauges).

When the length of the outdoor piping 30 is long, it may take several minutes for the pure water to reach the use destination from the delivery source. In this case, it is preferable to use a value deviating from the measurement time of the T _in data using the destination temperature T _out data. For example, when the residence time of pure water in the outdoor piping 30 is 15 minutes, it is preferable to use T _out measured 15 minutes after the measurement time of T _in as the use destination temperature T _out data. As for the outside air temperature T ₀ and the water supply flow rate W, it is preferable to use the average value of the residence time in the outdoor piping 30 .

The data processing server 413 reads out a part of the data recorded in the database 412, calculates the actual measurement value of the UA value based on the formula (4), and creates a relationship between the weather information around the outdoor piping 30 and the UA value of the outdoor piping 30. Model.

In the heating temperature determination device to be described later, the current value of the UA value representing the product of the total heat transfer coefficient and the heat transfer area of the outdoor piping 30 is estimated based on the model and the latest weather data and operation data around the outdoor piping 30 , to determine the heating target temperature.

For example, the data processing server 413 creates a data table such as Table 1 showing the relationship between the wind speed around the outdoor piping 30 and the UA value of the outdoor piping 30 based on past actual results. In addition, since the actual measurement value of the UA value calculated based on Formula (4) has a variance, both an average value and a standard deviation are shown.

[Table 1]

Here, for the sake of simplicity, the data processing server 413 created the data table in Table 1 using only the wind speed as the weather condition, but it is not limited to this. As the meteorological conditions, in addition to wind speed, a data table can be created using meteorological parameters such as outside air temperature, humidity, sunshine, wind direction, and precipitation.

In addition, the data processing server 413 may create an equation representing the relationship between the wind speed around the outdoor piping 30 and the UA value of the outdoor piping 30 instead of the data table in the form of a correspondence table like Table 1.

For example, when a multiple regression model is applied, it can be expressed by the following equation.

UA value=a ₀ +a ₁ ×(wind speed)+a ₂ ×(humidity)+a ₃ ×(sunshine)+…(a ₀ , a ₁ , a ₂ , a ₃ : constants).

Alternatively, the data processing server 413 may also use methods such as deep learning to construct an artificial intelligence model with meteorological parameters as explanatory variables and UA values as target variables.

The UA value prediction model created by the data processing server 413 is recorded in the server 413 itself.

[Application of UA Prediction Model]

Next, the heating temperature determination device 42 inputs the latest weather data and operation data around the outdoor piping 30 to the UA value prediction model recorded in the data processing server 413, and estimates the current value of the UA value. In addition, "recently" means from about 1 hour ago to the current time.

For example, when the current wind speed is 8 m/s, the current UA value can be estimated to be 1.2 kW/°C from the UA value prediction model (Table 1) recorded in the data processing server 413 .

As for the weather information, not only the weather information at the current time, but also future predicted values such as wind speed and the like may be used to determine the parameters. For example, when there is a concern that the weather changes sharply and the wind speed increases sharply, the UA value can also be determined using the estimated maximum wind speed.

In addition, in the pure water utilization facility 20, there are cases in which both a heating unit for heating the pure water sent from the pure water production facility 10 and a cooling unit for cooling the pure water are provided, and in some cases, as shown in FIG. In the case of having the above-mentioned heating unit and only having the cooling unit. In particular, when the pure water utilization facility 20 includes only the cooling unit, it is desirable to set the safety factor α as follows, and to set the UA value high.

UA decision value = (average value of UA obtained from the UA value prediction model (Table 1)) + α × (standard deviation of UA in the UA value prediction model (Table 1))

The standard deviation here refers to the standard deviation of the UA values in the sub-data set to which the weather information around the outdoor piping 30 belongs (the standard deviation of the sub-data classified by the wind speed and the like as shown in Table 1).

The value of the safety factor α is not particularly limited, and is basically a constant greater than 0 and 5 or less. The larger the safety factor is, the higher the target temperature T _in of the delivery source of pure water is set, and it is safe to keep the temperature T _out of the destination of pure water constant, but the energy saving performance is poor. For example, it is preferable to set the safety factor low when the weather is stable, and set the safety factor high when the weather is expected to change rapidly.

The database 412 is a device for storing data and files, and is configured as a storage unit including data such as a hard disk, a semiconductor memory, a storage medium, and a memory card.

The data processing server 413 stores a program that reads out part of the data recorded in the database 412, calculates the actual measured value of the UA value, and constructs a prediction model of the UA value. In addition, the UA value prediction model is recorded in the data processing server 413 itself.

[Heating temperature determination device 42]

The heating temperature determination device 42 has a processing unit and a measurement data storage unit for about a few minutes to an hour, and has a function for inputting the latest weather data into the UA prediction model obtained by the processing operation of the UA information processing device 41 Based on the operation data, the UA value at the current time is estimated, and the target temperature of the source of pure water is determined based on the target temperature of the use destination of pure water.

[Calculation of target temperature of delivery source of pure water]

The processing unit of the heating temperature determination device 42 inputs the latest weather data and operation data into the UA prediction model obtained by the processing operation of the UA information processing device 41, estimates the UA value at the current time, and then estimates the target temperature of the destination of pure water based on the , calculate the target temperature of the outgoing source of pure water.

From the above-mentioned formula (4), the relationship between the sending source temperature T _in measured by the sending source thermometer 14 and the use destination temperature T _out measured by the use destination thermometer 23 is represented by the formula (5).

[Formula 5]

Regarding the formula (5), when the formula (5) is modified into the formula for obtaining T _in , the formula (6) can be obtained.

[Formula 6]

The UA value prediction model is constructed by learning the past long-term measurement data, the UA value at the current time is estimated by applying the latest measurement data to the model, and the UA value is determined by adding a margin value to the model. Then, the processing unit of the heating temperature determination device 42 reads out the equation (6) and inputs various parameters including the target temperature T _out of the destination of pure water, whereby the target temperature T _in of the delivery source of the pure water can be calculated .

[Control of sending source target temperature]

Next, the processing unit of the heating temperature determination device 42 transmits the information of the source target temperature T _in to the pure water production facility 10 . As a result, the steam heater 13 of the pure water production facility 10 can adjust the amount of heat to be supplied based on the target temperature T _in of the output source calculated by the heating temperature determination device 42 .

In addition, in this embodiment, although the supply amount of heat of the steam heater 13 is adjusted, it is not limited to this. The pure water production facility 10 may include a steam heater 13 and/or a cooling device (not shown), and when controlling the target temperature of the sending source, the degree of heating by the steam heater 13 and/or the cooling device may be adjusted. degree of cooling.

Example

Hereinafter, the present invention will be specifically described by way of examples, but the present invention is not limited thereto.

<Example>

Using the water temperature control system 1 described in this embodiment, the target temperature T _in of the delivery source of pure water is calculated. Then, the steam heater 13 of the pure water production facility 10 adjusts the heat supply based on the target temperature T _in of the delivery source calculated by the heating temperature determination device 42 . After that, the use destination temperature T _out is kept constant by using the cooler 22 as necessary. Then, the pure water heating heat quantity of the steam heater 13 at the delivery source (pure water production facility 10 ) and the pure water cooling heat quantity of the cooler 22 at the utilization destination (pure water utilization facility 20 ) at this time are calculated.

The data input server 411 acquires measurement data of the outside air temperature T ₀ , the sending source temperature T _in , the use destination temperature T _out , and the sending water flow rate W every one minute through the communication network 50 .

The data processing server 413 refers to the above equation (4), and obtains the actual measurement value of the UA value from the acquired data. The UA value for 3 days was measured, and the frequency distribution shown in Fig. 3 was obtained. Based on past actual results, a data table showing the relationship between the wind speed around the outdoor piping 30 and the UA value of the outdoor piping 30 was created. The results are shown in Table 2. In this embodiment, Table 2 is used as the UA value prediction model.

[Table 2]

Next, the processing unit of the heating temperature determination device 42 reads the above-mentioned formula (6) and inputs various parameters including the target temperature T _out of the use destination of pure water, thereby calculating the target temperature T _in of the delivery source of pure water . When T _in was calculated under predetermined conditions when the destination target temperature T _out of pure water was 24°C and the water supply amount W of pure water was 200 m ³ /h, T _in was 24.3°C.

At this time, the temperature of the pure water produced by the pure water production apparatus 11 was 21.0°C. In order to transfer the pure water at 24.0°C to the pure water utilization facility 20 , it is necessary to use the steam heater 13 to heat the water in the pure water tank 12 from 21.0°C to 24.3°C. At this time, the pure water heating amount of the steam heater 13 at the delivery source (pure water production facility 10 ) is the water supply amount×the specific heat of the pure water×(the temperature after the heating of the pure water−the temperature before the heating of the pure water)=2,762 MJ/h.

When the temperature of the pure water sent from the pure water production facility 10 was measured using the destination thermometer 23, the result was 24.1°C, which was slightly higher than the target temperature of 24.0°C. Therefore, the pure water is lowered from 24.1°C to 24.0°C using the cooler 22 . At this time, the pure water cooling heat of the cooler 22 at the destination (pure water utilization facility 20 ) is the water supply amount×the specific heat of the pure water×(the temperature before the cooling of the pure water−the temperature after the cooling of the pure water)=84MJ /h.

<Comparative example>

Pure water is supplied by the conventional method shown in FIG. 4 . In consideration of heat dissipation from the surface of the water supply piping, the piping inlet temperature at the thermometer 114 was set to 25.0°C.

The temperature of the pure water produced by the pure water production apparatus 11 was 21.0°C as in the example. In order to transport the pure water at 24.0°C to the pure water utilization device 120 , it is necessary to use the steam heater 113 to heat the water in the pure water tank 112 from 21.0°C to 25.0°C. At this time, the pure water heating amount of the steam heater 113 at the delivery source (pure water production facility 110 ) is the amount of water supplied×the specific heat of the pure water×(the temperature after the heating of the pure water−the temperature before the heating of the pure water)=3,348 MJ/h.

When the temperature of the pure water sent from the pure water production facility 110 was measured by the destination thermometer 123, the result was 24.8°C exceeding the target temperature of 24.0°C. Therefore, the pure water is lowered from 24.8°C to 24.0°C using the cooler 122 . At this time, the pure water cooling heat of the cooler 122 at the destination (pure water utilization facility 120 ) is the water supply amount×the specific heat of the pure water×(the temperature before cooling of the pure water−the temperature after the cooling of the pure water)=670MJ /h.

<Result: Reduction in calories>

From the above, it was confirmed that when the water temperature control system 1 described in the present embodiment is used, the pure water heating amount of the steam heater 13 at the delivery source (pure water production facility 10 ) can be reduced by 18%, and the pure water heating amount can be reduced by 87%. The heat is cooled with pure water of the cooler 22 at the destination (pure water utilization facility 20).

According to the present embodiment, it is possible to construct UA for predicting the product of the total heat transfer coefficient U and the heat transfer area A of the outdoor piping 30 based on past weather data around the outdoor piping 30 and past operational performance data such as water temperature and flow rate. A value model, and by inputting the latest weather data and operation data into the model, the target temperature T _in of the delivery source of pure water is set. Thereby, it is no longer necessary to estimate the amount of heat radiated from the surface of the outdoor piping 30 and to set the output source target temperature T _in higher than the use destination target temperature T _out of the pure water. Therefore, according to the present embodiment, the amount of heat supplied to both the steam heater 23 at the source of pure water and the cooler 22 at the destination of use of pure water can be reduced, and as a result, it is possible to easily provide a Energy saving, cost saving method and system.

Description of reference numerals

1: water temperature control system; 10: pure water production equipment; 11: pure water production device; 12: pure water tank; 13: steam heater; 14: sending source thermometer; 20: pure water utilization equipment; 21: pure water receiving tank ; 22: cooler; 23: use destination thermometer; 30: outdoor piping; 40: sending source temperature control device; 50: communication network.

Claims (8)

1. A water temperature control method, wherein, In the process of supplying the temperature-adjusted water to the destination of the water through the outdoor piping, A model is constructed for predicting the UA value representing the product of the total heat transfer coefficient and the heat transfer area of the outdoor piping based on past weather data and past operational performance data around the outdoor piping, The UA value at the current moment is determined by inputting the latest weather data and operational data into the model, Based on the UA decision value and the water utilization destination target temperature, the delivery source target temperature is calculated, The supply heat of the heating unit and/or the cooling unit of the water at the delivery source is adjusted according to the delivery source target temperature. 2. water temperature control method according to claim 1, is characterized in that, The target temperature of the sending source is calculated by the following formula: Delivery source target temperature=outside air temperature+(use destination target temperature−outside air temperature)×EXP{UA predicted value/(outdoor piping water flow rate×water specific heat)}. 3. water temperature control method according to claim 1 or 2, is characterized in that, The UA determination value is calculated by inputting the latest weather data and operation data into the model, and adding a predetermined margin value to the UA prediction value obtained by the input. 4. water temperature control method according to claim 3, is characterized in that, The margin value is calculated by the following formula: Margin value = safety factor × (standard deviation of the measured value of UA) Here, the safety factor is a constant greater than 0 and 5 or less. 5. The method according to any one of claims 1 to 4, characterized in that, The model is a multiple regression model. 6. The method according to any one of claims 1 to 4, wherein, The model is an artificial intelligence model. 7. A model building apparatus that builds a model for predicting a UA value based on past weather data and past operational performance data around an outdoor pipe that sends water from a water treatment facility having a water temperature adjustment function to a treated water utilization facility, The UA value represents the product of the total heat transfer coefficient and the heat transfer area of the outdoor piping. 8. A water temperature control system, comprising: Water treatment equipment, which has the function of adjusting water temperature; a water utilization device that utilizes the treated water of the water treatment device; outdoor piping that sends water from the water treatment facility to the water utilization facility; and A sending source temperature control device, which controls the sending source target temperature, Wherein, the sending source temperature control device has: a model building unit that builds a model for predicting a UA value representing a product of a total heat transfer coefficient and a heat transfer area of the outdoor piping based on past weather data and past operational performance data around the outdoor piping; a UA value prediction unit that obtains a UA prediction value by inputting the latest weather data and operation data around the outdoor piping to the model; a delivery source target temperature calculation unit that obtains a delivery source target temperature based on the UA predicted value and the utilization destination target temperature of water; and A temperature control unit, which controls the water supply source to the target temperature of the water supply source.

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