Heat exchange system between raw water and circulating cooling water

Abstract

To provide a solution to solve the following problems: the fuel cost of kerosene used to heat raw water supplied to a purified water production device to a predetermined temperature in a boiler has become a major economic burden, and the carbon dioxide emissions generated during combustion have a significant impact on the environment.SOLUTION: A system includes: a raw water supply route 3 for supplying raw water to a pure water production device 2; and a cooling water circulation route 5 for cooling mechanical equipment 4. A first heat exchanger 6 is installed between the raw water supply route 3 and the cooling water circulation route 5 to exchange heat between the raw water and circulating cooling water after cooling the mechanical equipment 4 so that while the raw water is heated, the circulating cooling water is cooled.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a heat exchange system between raw water and circulating cooling water, and particularly to a heat exchange system that performs heat exchange between raw water supplied to a pure water production device and circulating cooling water for cooling mechanical equipment.

Background Art

[0002] When manufacturing electronic components such as crystal oscillators and crystal resonators, a large amount of pure water is used for cleaning the crystal substrate. This pure water is produced by allowing raw water such as abundant groundwater or tap water to permeate through a reverse osmosis membrane (RO membrane). However, if the temperature of the raw water is low when passing through the RO membrane, the RO membrane may become clogged, resulting in a decrease in the production efficiency of pure water and an increase in the amount of raw water to be discarded. Therefore, conventionally, the raw water has been heated to a certain temperature by a boiler or a heat exchanger and then passed through the RO membrane (see Patent Document 1).

[0003] On the other hand, the mechanical equipment for manufacturing electronic components such as the crystal oscillator and the crystal resonator generates heat during its mechanical operation and needs to be cooled because it can also cause malfunction or failure. Conventionally, a cooling water circulation device equipped with a chiller unit or the like has been provided, a circulation path for cooling water has been formed between the mechanical equipment, and the mechanical equipment has been cooled to an appropriate temperature by the circulation cooling water whose temperature is controlled by the cooling water circulation device (see Patent Document 2).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, when the raw water is heated in a boiler, using fossil fuels such as kerosene results in a large fuel cost, which is a significant economic burden. Additionally, the large environmental burden caused by the emission of carbon dioxide during combustion has also been an issue.

[0006] On the other hand, for the cooling water circulation device, a large amount of electric power is required to continuously supply the temperature-controlled circulating cooling water to the mechanical equipment by electricity, and the electricity cost for operation has been a significant burden.

[0007] Therefore, in the present invention, a heat exchange system is provided that raises the temperature of the raw water by exchanging heat between the circulating cooling water after cooling the mechanical equipment and the raw water, thereby reducing the amount of fossil fuel used by the boiler, while lowering the temperature of the circulating cooling water to suppress the power consumption of the cooling water circulation device.

Means for Solving the Problem

[0008] To solve the above problems, the heat exchange system for raw water and circulating cooling water of the present invention includes a raw water supply path for supplying raw water to a pure water production device and a cooling water circulation path for cooling mechanical equipment, and has heat exchange means for performing heat exchange between the raw water and the circulating cooling water after cooling the mechanical equipment, heating the raw water while cooling the circulating cooling water.

[0009] Also, in the heat exchange system for raw water and circulating cooling water of the present invention, the heat exchange means may be arranged between the raw water supply path and the cooling water circulation path.

[0010] Further, in the heat exchange system for raw water and circulating cooling water of the present invention, a storage tank for raw water is installed on the upstream side of the raw water supply path, and a raw water circulation path for circulating the raw water is provided in this storage tank, and the heat exchange means may be arranged between this raw water circulation path and the cooling water circulation path.

[0011] Moreover, in the heat exchange system for raw water and circulating cooling water of the present invention, a storage tank for raw water is installed on the upstream side of the raw water supply path, and the heat exchange means may be arranged in this storage tank.

[0012] In addition, in the heat exchange system between raw water and circulating cooling water of the present invention, a cooling water circulation device may be provided on the downstream side of the heat exchange means in the cooling water circulation path, and a raw water heating device may be provided on the downstream side of the heat exchange means in the raw water supply path.

Advantages of the Invention

[0013] According to the heat exchange system between raw water and circulating cooling water of the present invention, since a heat exchange means for performing heat exchange between the raw water supplied to the pure water production device and the circulating cooling water after cooling the mechanical equipment is provided, while the amount of fossil fuel used by the boiler can be reduced by increasing the water temperature of the raw water, the power consumption of the cooling water circulation device can be suppressed by decreasing the water temperature of the circulating cooling water. That is, in addition to being able to reduce the carbon dioxide emissions by suppressing the amount of fossil fuel used and the power consumption, by heating the raw water to an appropriate temperature and then passing it through the RO membrane, the production efficiency of pure water can be improved and the amount of raw water used can be reduced.

[0014] In addition, according to the heat exchange system between raw water and circulating cooling water of the present invention, since the heat exchange means is arranged between the raw water supply path and the cooling water circulation path, the existing raw water supply path piped to the pure water production device and the existing cooling water circulation path piped to the mechanical equipment can be utilized as they are.

[0015] In addition, according to the heat exchange system between raw water and circulating cooling water of the present invention, since a storage tank for raw water is installed on the upstream side of the raw water supply path and the raw water in this storage tank is heated by the heat exchange means, the water temperature of the raw water in the entire storage tank can be increased, and the heating of the raw water by the boiler can be made slight.

Brief Description of the Drawings

[0016]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Embodiments for Carrying Out the Invention

[0017] Hereinafter, a heat exchange system for raw water and circulating cooling water according to the present invention will be described based on each embodiment with reference to the drawings. The drawings schematically show the constituent members and peripheral members of the heat exchange system, and their actual dimensions and dimensional ratios do not necessarily match the dimensions and dimensional ratios in the drawings. In addition, duplicate descriptions will be omitted as appropriate, and the same reference numerals may be assigned to the same members.

[0018] FIG. 1 shows a first embodiment of a heat exchange system for raw water and circulating cooling water according to the present invention. This heat exchange system 1 includes a raw water supply path 3 for supplying raw water to a pure water production device 2, a cooling water circulation path 5 for cooling mechanical equipment 4, and a first heat exchanger 6 provided between these two paths. The raw water supply path 3 is a path for supplying groundwater pumped up from the ground to the pure water production device 2, and a boiler 7 for heating the raw water to a predetermined temperature is installed in the middle of the path on the upstream side of the pure water production device 2. The boiler 7 burns fossil fuels such as kerosene to adjust the temperature of the raw water supplied to the pure water production device 2 to about 24°C. This is because the temperature of the groundwater is 16 - 17°C throughout the year. If the groundwater is directly permeated through the RO membrane of the pure water production device 2, the RO membrane is likely to become clogged, and the production efficiency of pure water will decrease. The pure water produced by the pure water production device 2 is used as the substrate cleaning water when manufacturing electronic components such as crystal oscillators and crystal resonators.

[0019] The cooling water circulation path 5 is a path for circulating the cooling water controlled to a constant temperature by the cooling water circulation device 8 between a plurality of mechanical equipment 4 to cool each mechanical equipment 4. The cooling water circulation device 8 includes a cooling unit, a water tank, and a chiller unit such as a pressure pump for cooling the circulating water, and sends the cooling water cooled to a constant temperature by the cooling unit to the cooling water circulation path 5 by the pressure pump. The cooling water circulation path 5 is composed of an outgoing circulation path 5a extending from the cooling water circulation device 8 to each mechanical equipment 4 and a return circulation path 5b extending from each mechanical equipment 4 to the cooling water circulation device 8. The outgoing circulation path 5a is a path for supplying the circulating cooling water cooled by the cooling water circulation device 8 to each mechanical equipment 4 in order to cool each mechanical equipment 4. In this embodiment, three outgoing circulation paths 5a are piped from the cooling water circulation device 8 to each mechanical equipment 4.

[0020] On the other hand, the return circulation path 5b is a path for returning the circulating cooling water after cooling each mechanical equipment 4 to the cooling water circulation device 8. The circulating cooling water flowing through the return circulation path 5b has a higher water temperature by cooling each mechanical equipment 4, but is cooled again by returning to the cooling water circulation device 8. For example, when the temperature of the circulating cooling water in the return circulation path 5b becomes about 22 ° C after cooling the mechanical equipment 4, it is cooled to about 19 ° C by the cooling water circulation device 8, and the mechanical equipment 4 can be cooled by the temperature difference. In this embodiment, a receiving water tank 9 is provided in the middle of the return circulation path 5b connecting each mechanical equipment 4 and the cooling water circulation device 8. This receiving water tank 9 is for storing the circulating cooling water after cooling each mechanical equipment 4 in one place. One return circulation path 5b extends from the bottom of the receiving water tank 9 to the cooling water circulation device 8.

[0021] In this embodiment, the first heat exchanger 6 is provided between the return circulation path 5b of the cooling water circulation path 5 and the raw water supply path 3. This first heat exchanger 6 exchanges heat between the groundwater flowing through the raw water supply path 3 and the circulating cooling water flowing through the return circulation path 5b after cooling the mechanical equipment 4. The first heat exchanger 6 is provided with a raw water inlet 6a and a raw water outlet 6b of the raw water supply path 3, and a circulating cooling water inlet 6c and a circulating cooling water outlet 6d of the return circulation path 5b, respectively. This first heat exchanger 6 has a structure in which, for example, the groundwater with a lower water temperature and the circulating cooling water with a higher water temperature flowing into the interior from the raw water inlet 6a and the circulating cooling water inlet 6c flow alternately through the gaps between a plurality of stacked heat transfer plates for heat exchange, and the heat energy of the circulating cooling water with a higher water temperature than the groundwater is transferred to the groundwater side, thereby increasing the water temperature of the groundwater. In one example, the groundwater that was at a water temperature of 16 - 17 °C on the raw water inlet 6a side of the first heat exchanger 6 rises to 21 - 22 °C on the raw water outlet 6b side. As a result, by installing the first heat exchanger 6 in the raw water supply path 3 upstream of the boiler 7, the boiler 7 heats the raw water heated to 21 - 22 °C by the first heat exchanger 6. Therefore, the boiler 7 only needs to raise the temperature of the raw water by 2 - 3 °C to heat it to about 24 °C at a predetermined temperature, so the amount of kerosene used can be significantly reduced.

[0022] On the other hand, the circulating cooling water after cooling the mechanical equipment 4 has a water temperature of about 22 °C on the circulating cooling water inlet 6c side of the first heat exchanger 6 in one example, but the heat energy is taken away by heat exchange with the groundwater, so it drops by about 3 °C and becomes about 19 °C on the circulating cooling water outlet 6d side of the first heat exchanger 6. As a result, in the cooling water circulation device 8, there is no need to further cool the circulating cooling water, and the power consumption for that part can be reduced, and it only requires the power consumption for constantly circulating the circulating cooling water through the mechanical equipment 4.

[0023] FIG. 2 shows a heat exchange system according to a second embodiment of the present invention. This heat exchange system 11 is an additional configuration to the heat exchange system 1 of the first embodiment described above, and includes a storage tank for temporarily storing groundwater pumped up from the ground, a so-called underground pool 12, a raw water circulation path 13 for returning the groundwater sent out from the underground pool 12 to the underground pool 12 again, a second return circulation path 14 extending from the water receiving tank 9 to the cooling water circulation device 8 through a path different from the return circulation path 5b, and a second heat exchanger 15 provided between the second return circulation path 14 and the raw water circulation path 13. Therefore, the same reference numerals are given to the same devices and components as those of the heat exchange system 1 of the first embodiment, and detailed description thereof is omitted.

[0024] The groundwater stored in the underground pool 12 is supplied to the pure water production device 2 through the raw water supply path 3. In this embodiment, the groundwater temporarily stored in the underground pool 12 is introduced into the raw water circulation path 13 and heated by the second heat exchanger 15, so that the water temperature of the entire underground pool 12 is increased. As a result, since the heated groundwater in the underground pool 12 is supplied to the pure water production device 2 through the raw water supply path 3, the heating by the boiler 7 provided in the middle of the raw water supply path 3 can be minimized, and the kerosene consumption of the boiler can be further reduced.

[0025] The raw water circulation path 13 is piped in a loop outward from one side wall 12a of the underground pool 12, forming a circulation path through which the raw water exits the underground pool 12 and returns to the underground pool 12. A second heat exchanger 15 is disposed at the tip portion of the loop of the raw water circulation path 13. Between the base end portion and the side wall 12a of the underground pool 12, there are provided a path inlet 16a for introducing the groundwater in the underground pool 12 into the raw water circulation path 13 and a path outlet 16b for returning the groundwater heat-exchanged via the second heat exchanger 15 from the raw water circulation path 13 to the underground pool 12. The groundwater in the underground pool 12 pumped into the raw water circulation path 13 from the path inlet 16a by a pumping pump (not shown) is heat-exchanged with the circulating cooling water by the second heat exchanger 15 while circulating through the raw water circulation path 13, and then returns to the underground pool 12 from the path outlet 16b. In this way, the groundwater stored in the underground pool 12 is constantly circulated through the raw water circulation path 13, and during this process, heat-exchange is performed with the circulating cooling water by the second heat exchanger 15, so that the water temperature of the entire groundwater in the underground pool 12 will rise.

[0026] The second heat exchanger 15 can be one having the same structure as the first heat exchanger 6 of the first embodiment and is installed between the raw water circulation path 13 and the second double-loop circulation path 14. The second heat exchanger 15 is provided with a circulating water inlet 15a and a circulating water outlet 15b of the raw water circulation path 13, and a circulating cooling water inlet 15c and a circulating cooling water outlet 15d of the second double-loop circulation path 14, respectively. This second heat exchanger 15 performs heat exchange between the groundwater in the underground pool 12 flowing into the interior from the circulating water inlet 15a and the circulating cooling water inlet 15c and the circulating cooling water flowing through the second double-loop circulation path 14 after cooling the mechanical equipment 4. By transferring the thermal energy of the circulating cooling water, whose water temperature is higher than that of the groundwater, to the groundwater side, the water temperature of the groundwater in the underground pool 12 is increased.

[0027] As an example, the case where the temperature of the circulating cooling water whose temperature is adjusted by the cooling water circulation device 8 is set to 21°C will be described. In this case, the temperature of the circulating cooling water after cooling the mechanical equipment 4 rises by about 3°C and becomes 24 to 25°C. When the groundwater in the underground pool 12 circulates through the raw water circulation path 13, heat exchange occurs between the groundwater and the circulating cooling water after cooling the mechanical equipment 4 by the second heat exchanger 15 installed in the raw water circulation path 13, so that the water temperature of the entire underground pool 12 rises to about 20°C. The groundwater whose water temperature has risen in this way is sent out from the underground pool 12 to the raw water supply path 3, and in the first heat exchanger 6 installed on the upstream side of the boiler 7, it is further heated to 24 to 25°C by heat exchange with the circulating cooling water. As a result, there is no need for the boiler 7 to heat, and the kerosene consumption in the boiler 7 is further reduced, and a significant reduction in the carbon dioxide emission amount is expected.

[0028] On the other hand, the circulating cooling water after cooling the mechanical equipment 4 has a water temperature of about 24 to 25°C at the circulating cooling water inlet 6c side of the first heat exchanger 6 and the circulating cooling water inlet 15c side of the second heat exchanger 15. However, due to the heat exchange with the groundwater flowing through the raw water supply path 3 and the raw water circulation path 13, the temperature drops by about 3°C, and at the circulating cooling water outlet 6d side of the first heat exchanger 6 and the circulating cooling water outlet 15d side of the second heat exchanger 15, the temperature drops to about 21°C. As a result, since there is no need for the cooling water circulation device 8 to further cool the circulating cooling water, the power consumption corresponding to that can be reduced.

[0029] Figure 3 shows a heat exchange system according to the third embodiment of the present invention. This heat exchange system 21 directly pipes a part of the cooling water circulation path 5 for cooling the mechanical equipment 4 into the underground pool 12, and contacts the groundwater in the underground pool 12 with this pipe to directly perform heat exchange between the two. The groundwater in the underground pool 12 heated by the heat exchange is directly supplied to the pure water production device 2 without being further heated. That is, in this embodiment, as heat exchange means, it does not include the first heat exchanger, the second heat exchanger, and the boiler as in the previous embodiment. In addition, this heat exchange system 21 has substantially the same configuration as the heat exchange system 1 of the first embodiment and the heat exchange system 11 of the second embodiment except for the above configuration, so detailed description is omitted by attaching the same reference numerals.

[0030] In this embodiment, the cooling water circulation path 5 for cooling the mechanical equipment 4 does not include a cooling water circulation device 8 as in the previous embodiment. That is, after cooling a plurality of each mechanical equipment 4, a part of the cooling water circulation path 5 is piped into the underground pool 12, and then extends from the underground pool 12 to each mechanical equipment 4. The part piped into the underground pool 12 is directly formed as the heat exchange path 22, and direct heat exchange is performed between the circulating cooling water flowing in the heat exchange path 22 and the groundwater in the underground pool 12. The heat exchange path 22 is preferably piped throughout the pool so as to reach every corner in the pool 12 in order to enhance the heat exchange efficiency in the pool 12. In this heat exchange system 21, without providing a water receiving tank on the downstream side of each mechanical equipment 4, the return circulation paths 5b extend from the outside of each mechanical equipment 4 to the underground pool 12 respectively. Then, after forming the heat exchange path 22 in the underground pool 12, it returns to the inside of each mechanical equipment as the forward circulation path 5a. That is, in this embodiment, three return circulation paths 5b extend directly to the inside of the underground pool 12 to form three heat exchange paths 22, and then directly exit from the underground pool 12 to form three forward circulation paths 5a and return to each mechanical equipment 4 again.

[0031] In this embodiment, the case where the temperature of the circulating cooling water for cooling the mechanical equipment 4 is set to 21°C will be described. In this case, the temperature of the circulating cooling water after cooling the mechanical equipment 4 becomes about 24 to 25°C. Therefore, the temperature on the underground pool inlet 22a side of the heat exchange path 22 piped to the underground pool 12 is also maintained at about 24 to 25°C. And in the underground pool 12, by directly contacting the groundwater in the underground pool 12 with the piping of the heat exchange path 22, the thermal energy of the circulating cooling water with a high temperature moves to the groundwater side with a low water temperature, thereby increasing the water temperature of the groundwater in the underground pool 12. In this embodiment, since the heat exchange path 22 is directly piped into the underground pool 12, the heat exchange rate with the groundwater is good, and the groundwater in the underground pool 12 can be heated to a water temperature of about 24°C. Therefore, without using heat exchange means or a boiler for heating as in the previous embodiment, the groundwater in the underground pool 12 can be directly supplied to the pure water production device 2.

[0032] On the other hand, the circulating cooling water that has exchanged heat with the groundwater through the heat exchange path 22 has its temperature drop to 21°C on the underground pool outlet 22b side of the heat exchange path 22. Therefore, the circulating cooling water sent from the heat exchange path 22 to the forward circulation path 5a can be directly supplied to the mechanical equipment 4 without further cooling.

[0033] Thus, in the heat exchange system 21 according to this embodiment, since the heat exchange between the circulating cooling water circulating in the cooling circulation path 5 and the groundwater is carried out in the underground pool 12, the heat exchange efficiency is improved, and the cooling water circulation device 8 installed in the cooling circulation path 5 as in the previous embodiment is no longer required. In the case where the heat exchange in the underground pool 12 is insufficient, or more reliable temperature control is required, etc., a cooling water circulation device 8 can also be provided in the cooling water circulation path 5. In that case, a water receiving tank 9 is provided on the downstream side of the mechanical equipment 4, and the cooling water circulation path 5 extending from the water receiving tank 9 through the underground pool 12 to the cooling water circulation device 8 can also be configured with a single pipe as in the previous embodiment.

[0034] In addition, in all of the above embodiments, the optimal temperature of the raw water supplied to the pure water production apparatus 2 has been described as being approximately 24°C, that is, around 24°C. However, the present invention is not necessarily limited to this temperature, and similar effects can be expected for pure water production when the temperature is approximately between 22°C and 26°C. Due to a slight variation in the temperature of the circulating cooling water flowing through the cooling water circulation path for mechanical equipment cooling, the supply temperature of the above raw water also varies.

[0035] Table 1 shows the kerosene consumption of the boilers in each heat exchange system of the first and second embodiments in comparison with the conventional case. The period of implementation was from April to July 2022 before the introduction of the heat exchanger, from August 2022 to April 2023 after the introduction of the first heat exchanger (first embodiment), and from May to July 2023 after the introduction of the first and second heat exchangers (second embodiment). As is clear from this table, compared with before the introduction of the heat exchanger, the kerosene consumption per day decreased by more than one digit after the introduction of the first heat exchanger, and the kerosene consumption further decreased significantly after the introduction of the first and second heat exchangers.

[0036]

Table 1

[0037] Figure 4 shows the daily kerosene consumption in Table 1 in a graph. In addition, the amount of crude oil equivalent and the amount of carbon dioxide emissions corresponding to each kerosene consumption are shown. As is clear from Figure 4, although 183 liters of kerosene were used per day before the introduction of the heat exchanger, the consumption amount became 14 liters after the introduction of the first heat exchanger, and it was possible to reduce it to 92% of that before the introduction of the heat exchanger (the daily kerosene consumption in August 2022 is not included because it was immediately after the introduction of the first heat exchanger). Furthermore, after the introduction of the first and second heat exchangers, the consumption amount became 8 liters and it was possible to reduce it to 96%. Also, in proportion to the kerosene consumption, the amount of carbon dioxide emissions could be significantly reduced. Although 0.480 tons of carbon dioxide were emitted before the introduction of the heat exchanger, it was possible to reduce it to 0.035 tons after the introduction of the first heat exchanger and to 0.020 tons after the introduction of the first and second heat exchangers.

[0038] Figure 5 shows the daily power consumption of the cooling water circulation device before the introduction of the heat exchanger, after the introduction of the first heat exchanger (first embodiment), and after the introduction of the first and second heat exchangers (second embodiment). As is also clear from this figure, the power consumption before the introduction of the heat exchanger was 942 Kwh per day, but after the introduction of the first heat exchanger, it became 624 Kwh per day, and further, after the introduction of the first and second heat exchangers, it only requires 197 Kwh per day. Also, in proportion to the power consumption, the carbon dioxide emissions can be reduced. The emissions before the introduction of the heat exchanger were 0.448 tons, but after the introduction of the first heat exchanger, they could be reduced to 0.297 tons, and after the introduction of the first and second heat exchangers, they could be reduced to 0.094 tons.

Explanation of Signs

[0039] 1, 11, 21 Heat exchange system 2 Pure water production device 3 Raw water supply path 4 Machinery and equipment 5 Cooling water circulation path 5a Forward circulation path 5b Return circulation path 6 First heat exchanger 6a Raw water inlet 6b Raw water outlet 6c Circulating cooling water inlet 6d Circulating cooling water outlet 7 Boiler 8 Cooling water circulation device 9 Water receiving tank 12 Underground pool 12a Side wall of the underground pool 13 Raw water circulation path 14 Second return circulation path 15 Second heat exchanger 15a Circulating water inlet 15b Circulating water outlet 15c Circulating cooling water inlet 15d Circulating cooling water outlet 16a Path inlet 16b Path outlet 22 Heat exchange path 22a Underground pool entrance 22b Underground pool exit

Claims

1. A raw water supply path for supplying raw water to a pure water manufacturing apparatus, and a cooling water circulation path for cooling mechanical equipment, A heat exchange system for raw water and circulating cooling water, which has heat exchange means for performing heat exchange between the raw water and the circulating cooling water after cooling the mechanical equipment, while heating the raw water and cooling the circulating cooling water.

2. The heat exchange system for raw water and circulating cooling water according to Claim 1, wherein the heat exchange means is disposed between the raw water supply path and the cooling water circulation path.

3. A storage tank for raw water is installed upstream of the raw water supply path, and a raw water circulation path for circulating the raw water is provided in this storage tank, and the heat exchange means is disposed between this raw water circulation path and the cooling water circulation path. The heat exchange system for raw water and circulating cooling water according to Claim 1.

4. The heat exchange system for raw water and circulating cooling water according to Claim 1, wherein a storage tank for raw water is installed upstream of the raw water supply path, and the heat exchange means is disposed in this storage tank.

5. The heat exchange system for raw water and circulating cooling water according to Claim 2 or 3, wherein a cooling water circulation device is provided downstream of the heat exchange means in the cooling water circulation path.

6. The heat exchange system for raw water and circulating cooling water according to Claim 2 or 3, wherein a raw water heating device is provided downstream of the heat exchange means in the raw water supply path.

7. The heat exchange system for raw water and circulating cooling water according to Claim 1, wherein the water temperature of the raw water supplied to the pure water manufacturing apparatus is about 24 degrees.

8. The heat exchange system for raw water and circulating cooling water according to Claim 1, wherein at least one of groundwater and tap water is supplied to the raw water supply path.

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