JP7276675B2 - heat exchange system - Google Patents

Description

TECHNICAL FIELD The present invention relates to a heat exchange system , and more particularly to a heat exchange system suitable for a system including a heat exchanger that exchanges heat using impure water.

Water such as seawater, river water, lake water, groundwater, and waste water is used in various fields such as aquaculture facilities, air conditioning facilities, power generation systems, and heat recovery systems. These installations and systems often include heat exchange systems that convert cold water to hot water and hot water to cold water.

When using water such as seawater, river water, lake water, groundwater, and wastewater, it often contains impurities such as inorganic and organic substances, and scales and biofilms are formed on the inner surface of the pipes that circulate these waters. Sometimes. If scales or biofilms are formed on the inner surface of the pipe, the effective cross-sectional area of the pipe will be reduced, resulting in a decrease in heat exchange efficiency. Therefore, it is necessary to monitor the thickness of scales and biofilms in order to suppress a decrease in heat exchange efficiency.

For example, Patent Literature 1 discloses a scale adhesion monitoring device for monitoring scales adhering to piping lines of a geothermal fluid utilization system. A method is disclosed in which a thermometer for measuring the inlet/outlet temperature of the medium and a flow meter for measuring the flow rate of the raw hot water are arranged, and the scale thickness is calculated based on these measurement data.

JP 2010-090782 A

However, in the method described in Patent Document 1, since the flow rate of raw hot water (hereinafter referred to as heat source water) is directly measured by a flow meter, the piping for circulating the heat source water to the monitoring heat exchanger There is also the problem that scale is formed on the heat source water, making it difficult to accurately measure the flow rate of the heat source water. Such problems can also occur in piping where biofilms are formed.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a heat exchange system and a monitoring method thereof that can accurately determine the flow rate of heat source water.

According to the present invention, a heat source water line for circulating the heat source water by taking in heat source water from the external environment through the water intake line and discharging the heat source water to the external environment through the drain line, a circulation line for circulating the heat medium, and the water intake. a first heat exchanger that exchanges heat between the line and the circulation line; a second heat exchanger that exchanges heat between the drainage line and the circulation line; and the second heat in the drainage line. a first temperature sensor for measuring the inlet temperature of the exchanger; a second temperature sensor for measuring the outlet temperature of the second heat exchanger in the waste water line; a third temperature sensor for measuring; a fourth temperature sensor for measuring the outlet temperature of the second heat exchanger in the circulation line; a flow meter for measuring the flow rate in the circulation line; the first temperature sensor; A heat exchange system comprising: two temperature sensors, the third temperature sensor, the fourth temperature sensor, and a computing device that calculates the flow rate of the heat source water line based on the measured values of the flow meter. be done.

Further, according to the present invention, a heat source water line for circulating the heat source water by taking in heat source water from the external environment through the water intake line and discharging the heat source water to the external environment through the drain line, a circulation line for circulating the heat medium, A first brine line interposed between the intake line and the circulation line, a second brine line interposed between the drainage line and the circulation line, and between the intake line and the first brine line A first heat exchanger that exchanges heat with a second heat exchanger that exchanges heat between the waste water line and the second brine line, and the inlet temperature of the second heat exchanger of the waste water line a second temperature sensor for measuring the outlet temperature of the second heat exchanger in the waste water line ; and a third temperature sensor for measuring the inlet temperature of the second heat exchanger in the second brine line . a temperature sensor, a fourth temperature sensor that measures the outlet temperature of the second heat exchanger of the second brine line , a flow meter that measures the flow rate of the second brine line , the first temperature sensor, the first A heat exchange system comprising: two temperature sensors, the third temperature sensor, the fourth temperature sensor, and a computing device that calculates the flow rate of the heat source water line based on the measured values of the flow meter. be done.

The heat source water may be water containing more inorganic substances or organic substances than fresh water.

Also, the heat source water may be waste water from a culture tank or water supplied to the culture tank.

Also, the heat medium may be fresh water or antifreeze.

Also, the first temperature sensor and the second temperature sensor may be of a compression fitting type.

According to the heat exchange system according to the present invention described above, without directly measuring the flow rate of the heat source water line, the heat exchanger inlet temperature and outlet temperature of the heat source water line, the heat exchanger inlet temperature of the circulation line, Since it is calculated based on the temperature, the outlet temperature, and the flow rate of the circulation line, it is possible to accurately grasp the flow rate of the heat source water even if scales or biofilms are formed on the inner surface of the heat source water line. can be done.

1 is an overall configuration diagram of a heat exchange system according to a first embodiment of the present invention; FIG. It is the schematic which shows an example of a 1st temperature sensor and a 2nd temperature sensor, (a) shows the state with the thermocouple inserted, (b) shows the state with the thermocouple pulled out. FIG. 4 is a flow diagram showing a method for monitoring the heat exchange system according to the first embodiment of the present invention; FIG. 4 is a partial configuration diagram showing a heat exchange system according to another embodiment of the present invention, where (a) shows the second embodiment, (b) shows the third embodiment, and (c) shows the fourth embodiment. there is

An embodiment of the present invention will be described below with reference to FIGS. 1 to 4(c). Here, FIG. 1 is an overall configuration diagram of the heat exchange system according to the first embodiment of the present invention. FIG. 2 is a schematic diagram showing an example of the first temperature sensor and the second temperature sensor, where (a) shows a state in which the thermocouple is inserted and (b) shows a state in which the thermocouple is pulled out.

The heat exchange system according to the first embodiment shown in FIG. 1 is applied to a self-heat regeneration cycle system used in aquaculture facilities for marine organisms such as fish. As shown in FIG. 1, the heat exchange system according to the present embodiment includes a heat source water line 1 for circulating heat source water, a circulation line 2 for circulating a heat medium, and between the heat source water line 1 and the circulation line 2 and two heat exchangers 3 (a first heat exchanger 31 and a second heat exchanger 32) that perform heat exchange at. The heat exchanger 3 arranged on the upstream side of the heat source water line 1 is called a first heat exchanger 31, and the heat exchanger 3 arranged on the downstream side of the heat source water line 1 is called a second heat exchanger 32. is called In addition, in FIG. 1, for convenience of explanation, the heat source water line 1 is illustrated by a solid line, and the circulation line 2 is illustrated by a dashed line.

The heat source water line 1 includes, for example, a water intake line 11 that draws in seawater and supplies the seawater heated by the first heat exchanger 31 to the temperature-controlled water storage tank 4, A water supply line 12 that supplies water from the tank 4 to the culture tank 5, a first drainage line 13 that drains used seawater from the culture tank 5 to the drainage ditch 6, and a second heat exchanger 32 that pumps up wastewater from the drainage ditch 6. a second drain line 14 for draining to the outside environment after waste heat recovery.

The water intake line 11 is a line that takes seawater from the external environment into the heat source water line 1 . The water intake line 11 includes, although not shown, a pump for drawing seawater, a filter for removing foreign matters, marine organisms, and the like contained in the seawater. Since the seawater supplied to the water intake line 11 is generally low-temperature seawater having a temperature lower than the temperature suitable for cultivating marine organisms, the first heat exchanger 31 heats the seawater to a temperature close to the appropriate temperature.

The temperature-controlled water tank 4 has a function of heating and maintaining the supplied seawater to a temperature suitable for cultivating marine organisms. A heating means 41 such as a boiler or an electric heater is arranged in the temperature control water tank 4 . Note that the heating means 41 may be omitted when the first heat exchanger 31 can heat to an appropriate temperature.

The water supply line 12 is a line that supplies seawater at an appropriate temperature to the aquaculture tank 5 . Marine organisms to be cultivated are raised in the aquaculture tank 5 . Since the seawater in the aquaculture tank 5 is contaminated with impurities such as feed residues and feces, it is necessary to replace the seawater constantly or periodically.

The first drain line 13 is a line for draining seawater in the culture tank 5 to the drain 6 . The drainage ditch 6 functions as a water tank that adjusts the balance between the amount of drainage from the aquaculture tank 5 and the amount of supply of drainage to the second heat exchanger 32 .

The second drain line 14 is a line that supplies the waste water in the drain 6 to the second heat exchanger 32 and finally drains it to the outside environment. The second drainage line 14 is provided with a pump 14a for pumping up the drainage in the drainage ditch 6 and a strainer 14b arranged upstream of the pump 14a for removing solids in the drainage.

In the heat exchange system according to the present embodiment, since the seawater in the external environment is drawn in and then heated by the first heat exchanger 31 and the temperature control water tank 4, when the seawater is discharged to the external environment as it is, Due to the higher temperature of the waste water than the seawater present in the external environment, it is expected that marine organisms will proliferate in the drain outlet. Therefore, in this embodiment, by recovering the waste heat of the waste water in the second heat exchanger 32, it is possible to lower the temperature of the waste water to approximately the same temperature as the seawater in the external environment to which the waste water is discharged. is suppressed.

The circulation line 2 has a closed-loop pipeline, and a compressor 21 and an expansion valve 22 are arranged in the line. The heat medium circulated in the pipeline is, for example, antifreeze. A first heat exchanger 31 is arranged between the compressor 21 and the expansion valve 22 , and a second heat exchanger 32 is arranged between the compressor 21 and the expansion valve 22 .

The first heat exchanger 31 functions as a condenser because it gives heat to low-temperature seawater and takes heat from the heat medium. The second heat exchanger 32 functions as an evaporator because it takes heat from the heated seawater (waste water) and gives heat to the heat medium. Therefore, the circulation line 2 constitutes a so-called heat pump.

In addition, the heat exchange system according to the present embodiment includes a first temperature sensor 7a that measures the inlet temperature T _{sou_in} of the second heat exchanger 32 of the heat source water line 1 (second drainage line 14), the heat source water line 1 ( A second temperature sensor 7b measuring the outlet temperature T _{sou_out} of the second heat exchanger 32 in the second drain line 14) and a third temperature sensor measuring the inlet temperature T _{bra_in} of the second heat exchanger 32 in the circulation line 2). 7c, a fourth temperature sensor 7d for measuring the outlet temperature _{Tbra_out} of the second heat exchanger 32 of the circulation line 2, and a flow rate _mbra of the heat medium flowing through the second heat exchanger 32 of the circulation line 2. Based on the flow meter 7e, the first temperature sensor 7a, the second temperature sensor 7b, the third temperature sensor 7c, the fourth temperature sensor 7d and the measurement values of the flow meter 7e, the heat source water line 1 (second drainage line 14) and _{a display means 9 for displaying the calculated flow rate M sou of} the heat source water line 1 (second drainage line 14).

Since the heat source water line 1 takes in seawater from the external environment through the water intake line 11, fine inorganic substances and organic substances are mixed into the line even though the line is filtered. In addition, in the aquaculture tank 5, since impurities such as feed residue and excrement are mixed in with the seawater, the inner surface of the first drainage line 13 and the second drainage line 14, which circulate the drainage from the aquaculture tank 5, and the drainage groove The wall surface of 6 is in an environment where bioforms are easily formed.

In particular, when a biofilm is formed in the second drainage line 14 that relays the second heat exchanger 32 and the effective cross-sectional area of the pipe is reduced, the heat exchange efficiency is reduced. Moreover, in this embodiment, since the circulation line 2 constitutes a heat pump, there is also a problem that the power consumption of the compressor 21 increases when the biofilm becomes thick.

Here, the volume flow rate (m ³ /s) of the second drainage line 14 is determined by the product of the effective cross-sectional area (m ² ) of the pipe and the average flow velocity (m / s), where the biofilm is formed As a result, if the effective cross-sectional area of the pipe becomes smaller, it will have a large effect on the numerical value of the average flow velocity. In addition, the average flow velocity also changes depending on the types of substances (biofilms, scales, shellfish, etc.) attached to or formed on the inner surface of the pipe.

Therefore, when an in-line flow meter is arranged in the pipe, an error occurs in the measured value, making it difficult to measure the accurate flow rate. Moreover, even when the flow rate is measured from the outside of the pipe using an ultrasonic flowmeter or the like, it is difficult to measure the flow rate accurately due to errors caused by deposits on the inner surface of the pipe.

Therefore, in the heat exchange system according to this embodiment, the flow rate of the second drainage line 14 is not directly measured. Specifically, the flow rate M _sou of the waste water in the heat source water line 1 (second waste water line 14) is calculated by the mathematical formula shown in Equation 1. In Equation 1, C _Pbra indicates the specific heat of the heat medium circulating through the circulation line 2 , and C _Psou indicates the specific heat of the heat source water circulating through the heat source water line 1 .

The computation using this equation 1 is processed by the computing device 8 . Arithmetic device 8 may be a normal personal computer, or may be a control panel incorporated in the control device of the heat exchange system. The calculation result is displayed on the display means 9 such as a monitor. The numerical value of the flow rate M _sou of the heat source water line 1 may be displayed on the display means 9, and it is determined whether or not the numerical value of the flow rate M _sou of the heat source water line 1 is equal to or greater than a predetermined reference value. You may make it display a result.

The first temperature sensor 7a to the fourth temperature sensor 7d are, for example, thermocouples inserted from the peripheral surface of the pipe into the center of the pipe. Also, the flowmeter 7e is, for example, an in-line flowmeter that is arranged inside the piping of the circulation line 2 .

Here, since the tips of the thermocouples that constitute the first temperature sensor 7a and the second temperature sensor 7b are exposed to the heat source water (wastewater) flowing through the second drainage line 14, scales and biofilms are It is difficult to form, and it is thought that these deposits have little effect on temperature measurement.

However, when more accurate temperature measurement is required, as shown in FIGS. may be used. By using a compression fitting type temperature sensor, the thermocouple 10 d can be inserted and removed while the waste water (seawater) is circulating in the pipe 10 .

For example, a compression fitting type temperature sensor has a pedestal 10a fixed to the peripheral surface of a pipe 10, a mounting screw 10b is screwed into the pedestal 10a, and a fixing bead (not shown) is inserted into the mounting screw 10b. , and a holding screw 10c. The thermocouple 10d is inserted into through-holes formed in the press screw 10c, the fixing bead, the mounting screw 10b, the base 10a, and the pipe 10. As shown in FIG.

By using such a compression fitting type temperature sensor, for example, as shown in FIG. After the thermocouple 10d is pulled out from the pipe 10 as shown in FIG. 2A, the thermocouple 10d can be inserted into the pipe 10 again as shown in FIG. 2(a). A biofilm adhered or formed on the surface of the thermocouple 10d can be removed by inserting and removing the thermocouple 10d.

Moreover, by using such a compression fitting type temperature sensor, for example, as shown in FIG. A thermocouple 10d can be inserted into the pipe 10, as shown in 2(a). This treatment can reduce biofilms that adhere or form on the surface of the thermocouple 10d.

Next, a method for monitoring the heat exchange system according to the present embodiment described above will be described with reference to FIG. Here, FIG. 3 is a flow chart showing the method for monitoring the heat exchange system according to the first embodiment of the present invention.

The method for monitoring the heat exchange system according to the present embodiment includes a first measurement step Step 1 for measuring the inlet temperature T _{sou_in} and the outlet temperature T _{sou_out} of the second heat exchanger 32 of the heat source water line 1, A second measuring step Step 2 of measuring the inlet temperature T _{bra_in} and the outlet temperature T _{bra_out} of the heat exchanger 32, a third measuring step Step 3 of measuring the flow rate m _bra of the circulation line 2, and the inlet temperature T _{sou_in} of the heat source water line 1 and the outlet temperature T _{sou_out} , the inlet temperature T _{bra_in} and outlet temperature T _{bra_out} of the circulation line 2, and the flow rate M _sou of the heat source water line 1 based on the measured values of the flow rate m _bra of the circulation line 2; and a monitoring step Step5 for monitoring the flow rate M _sou of the heat source water line 1.

In the first measurement step Step 1, when compression-fitting type temperature sensors are used as the first temperature sensor 7a and the second temperature sensor 7b, before measuring the inlet temperature T _{sou_in} and the outlet temperature T _{sou_out} , the temperature sensor A step of inserting and removing the thermocouple 10d from the pipe 10 of the heat source water line 1 (second drain line 14) may be included, and when measuring the inlet temperature T _{sou_in} and the outlet temperature T _{sou_out} , the thermocouple 10d of the temperature sensor into the pipe 10 of the heat source water line 1 (second drain line 14).

The measurement data measured in the first measurement process Step 1 to the third measurement process Step 3 are transmitted to the computing device 8 . The calculation process Step 4 is processed by the calculation device 8 . Specifically, the flow rate M _sou of the heat source water line 1 is calculated by Equation 1 described above.

The monitoring step Step5 is a step of monitoring whether or not the calculated flow rate M _sou of the heat source water line 1 is equal to or greater than a predetermined reference value. When the flow rate M _sou of the heat source water line 1 is equal to or greater than the reference value (Y), it can be determined that the thickness of the biofilm is thin and the predetermined heat exchange efficiency is maintained. can. Therefore, in this case, the process ends without washing the pipe 10 . After a predetermined time has elapsed, the first measurement step Step1 to the monitoring step Step5 are repeated.

On the other hand, when the flow rate M _sou of the heat source water line 1 is less than the reference value (N), it can be determined that the biofilm is thick and the heat exchange efficiency is reduced. can. Therefore, in this case, the process proceeds to the cleaning step Step 6 for cleaning the pipe 10 of the heat source water line 1 . After the cleaning step Step 6 is finished and a predetermined time has passed, the first measurement step Step 1 to the monitoring step Step 5 are repeated.

As described above, the heat source water line 1 has the water intake line 11, the water supply line 12, the first drainage line 13 and the second drainage line 14. The second drainage line 14 is the most dirty seawater (wastewater) It is a line that distributes Therefore, the water intake line 11 to the first drainage line 13 and the drainage groove 6 may be cleaned at the timing when the second drainage line 14 is cleaned.

According to the heat exchange system monitoring method according to the present embodiment described above, the inlet temperature T _{sou_in} of the second heat exchanger 32 of the heat source water line 1 is determined without directly measuring the flow rate M _sou of the heat source water line 1 . and the outlet temperature T _{sou_out} , the inlet temperature T _{bra_in} and the outlet temperature T _{bra_out} of the second heat exchanger 32 of the circulation line 2, and the flow rate m _bra of the circulation line 2. Even if scales or biofilms are formed on the inner surface of the pipe, the flow rate M _sou of the heat source water can be accurately determined.

Next, a heat exchange system according to another embodiment of the present invention will be described with reference to FIGS. 4(a) to 4(c). Here, FIG. 4 is a partial configuration diagram showing a heat exchange system according to another embodiment of the present invention, (a) is the second embodiment, (b) is the third embodiment, and (c) is the second embodiment. Four embodiments are shown. Note that the same reference numerals are given to the same components as in the above-described first embodiment, and redundant explanations are omitted.

In the heat exchange system according to the second embodiment shown in FIG. 4A, the inlet temperature T _{sou_in} of the first heat exchanger 31 of the heat source water line 1 (water intake line 11) , a second temperature sensor 7b for measuring the outlet temperature T _{sou_out} of the first heat exchanger 31 of the heat source water line 1 (water intake line 11), and the first heat exchanger of the circulation line 2 A third temperature sensor 7c that measures the inlet temperature _{Tbra_in} of the circulation line 2, a fourth temperature sensor 7d that measures the outlet temperature _{Tbra_out} of the first heat exchanger 31 in the circulation line 2, and a flow rate _mbra in the circulation line 2. A flow meter 7e is arranged.

Depending on the state of the external environment of the seawater taken into the heat exchange system, scales and biofilms may form in the water intake line 11 . Therefore, in the second embodiment, the deterioration of the heat exchange efficiency of the first heat exchanger 31 is directly monitored. The measurement data of the first temperature sensor 7a, the second temperature sensor 7b, the third temperature sensor 7c, the fourth temperature sensor 7d, and the flow meter 7e are transmitted to the arithmetic unit 8, and the flow rate of the heat source water line 1 (water intake line 11) M _sou is calculated.

The heat exchange system according to the third embodiment shown in FIG. It has Specifically, a first fresh water brine line 15 is interposed between the intake line 11 and the circulation line 2, and a second fresh water brine line 16 is interposed between the second drainage line 14 and the circulation line 2. . The first fresh water brine line 15 and the second fresh water brine line 16 are a type of circulation line because they are lines for circulating fresh water in a closed loop pipeline.

A first heat exchanger 31 is arranged between the water intake line 11 and the first fresh water brine line 15, and a third heat exchanger 33 is arranged between the circulation line 2 and the first fresh water brine line 15. . A second heat exchanger 32 is arranged between the second drain line 14 and the second fresh water brine line 16, and a fourth heat exchanger 34 is arranged between the circulation line 2 and the second fresh water brine line 16. It is

Also, the first temperature sensor 7a and the second temperature sensor 7b are arranged in the second drainage line 14, and the third temperature sensor 7c, the fourth temperature sensor 7d and the flow meter 7e are arranged in the second fresh water brine line 16. ing. Therefore, the heat medium to be measured in the third embodiment is fresh water.

In this way, by interposing the fresh water brine line, for example, even if the piping of the fresh water brine line is broken, fresh water will only be mixed into the heat source water line 1 (the water intake line 11 or the second drainage line 14). There is no impact on the marine organisms to be cultivated or the external environment of the discharge destination.

The heat exchange system according to the fourth embodiment shown in FIG. 4(c) intervenes the first fresh water brine line 15 and the second fresh water brine line 16, as in the third embodiment. In this fourth embodiment, the first temperature sensor 7a and the second temperature sensor 7b are arranged in both the water intake line 11 and the second drainage line 14, and the third temperature sensor 7c, the fourth temperature sensor 7d and the flow meter 7e are Located in both the first fresh water brine line 15 and the second fresh water brine line 16 . With such a configuration, it is possible to directly monitor the deterioration of the heat exchange efficiency of both the first heat exchanger 31 and the second heat exchanger 32 .

In the above-described embodiment, the case where the heat source water is seawater has been described, but the heat source water may be river water, lake water, groundwater, drainage water, or the like. These heat source waters are waters containing more inorganic or organic substances than fresh water.

The present invention is not limited to the above-described embodiments, and various modifications are possible without departing from the scope of the present invention.

1 Heat source water line 2 Circulation line 3 Heat exchanger 4 Temperature control water tank 5 Aquaculture tank 6 Drain 7a First temperature sensor 7b Second temperature sensor 7c Third temperature sensor 7d Fourth temperature sensor 7e Flow meter 8 Arithmetic device 9 Display means 10 pipe 10a base 10b mounting screw 10c set screw 10d thermocouple 11 water intake line 12 water supply line 13 first drain line 14 second drain line 14a pump 14b strainer 15 first fresh water brine line 16 second fresh water brine line 21 compressor 22 Expansion valve 31 First heat exchanger 32 Second heat exchanger 33 Third heat exchanger 34 Fourth heat exchanger 41 Heating means Step1 First measurement process Step2 Second measurement process Step3 Third measurement process Step4 Operation process Step5 Monitoring Process Step6 Washing process

Claims (6)

a heat source water line for circulating the heat source water by taking in heat source water from the external environment through the water intake line and discharging the heat source water to the external environment through the drain line;
a circulation line for circulating the heat medium;
a first heat exchanger that exchanges heat between the water intake line and the circulation line;
a second heat exchanger that exchanges heat between the drainage line and the circulation line;
a first temperature sensor that measures the inlet temperature of the second heat exchanger in the waste water line;
a second temperature sensor for measuring the outlet temperature of the second heat exchanger in the waste water line;
a third temperature sensor that measures the inlet temperature of the second heat exchanger of the circulation line;
a fourth temperature sensor that measures the outlet temperature of the second heat exchanger in the circulation line;
a flow meter for measuring the flow rate of the circulation line;
an arithmetic device for calculating the flow rate of the heat source water line based on the measured values of the first temperature sensor, the second temperature sensor, the third temperature sensor, the fourth temperature sensor, and the flow meter;
A heat exchange system comprising: a heat source water line for circulating the heat source water by taking in heat source water from the external environment through the water intake line and discharging the heat source water to the external environment through the drain line;
a circulation line for circulating the heat medium;
a first brine line interposed between the water intake line and the circulation line;
a second brine line interposed between the drainage line and the circulation line;
a first heat exchanger that exchanges heat between the water intake line and the first brine line;
a second heat exchanger that exchanges heat between the drain line and the second brine line;
a first temperature sensor that measures the inlet temperature of the second heat exchanger in the waste water line ;
a second temperature sensor for measuring the outlet temperature of the second heat exchanger in the waste water line ;
a third temperature sensor that measures the inlet temperature of the second heat exchanger in the second brine line ;
a fourth temperature sensor that measures the outlet temperature of the second heat exchanger in the second brine line ;
a flow meter for measuring the flow rate of the second brine line ;
an arithmetic device for calculating the flow rate of the heat source water line based on the measured values of the first temperature sensor, the second temperature sensor, the third temperature sensor, the fourth temperature sensor, and the flow meter;
A heat exchange system comprising: The heat exchange system according to claim 1 or 2 , wherein the heat source water is water containing more inorganic substances or organic substances than fresh water. 3. The heat exchange system according to claim 1 or 2 , wherein the heat source water is waste water from a culture tank or water supplied to the culture tank. 3. The heat exchange system according to claim 1 , wherein said heat medium is fresh water or antifreeze. 3. The heat exchange system according to claim 1, wherein said first temperature sensor and said second temperature sensor are compression fitting type.

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