KR20220100829A - Passive cooling device - Google Patents

Abstract

According to one aspect of the present invention, provides is a passive cooling device which comprises: a first passive heat exchanger that heat-exchanges transferred heat with air; an inner housing having upper and lower portions opened, wherein the first passive heat exchanger is disposed in the inner housing; a housing disposed to surround the inner housing and accommodating water therein; a boiling pot disposed in a lower portion of the inner housing and accommodating water supplied from the housing; and a second passive heat exchanger disposed inside the boiling pot and heat-exchanging heat transferred through the first passive heat exchanger with water.

Description

Passive cooling device {PASSIVE COOLING DEVICE}

The present invention relates to a passive cooling device, and to a passive cooling device capable of passively cooling a nuclear reactor installed on a ship.

After the Fukushima accident, research on design optimization for passive cooling of nuclear power facilities has been actively conducted. The passive cooling facility is a facility for removing residual heat remaining in the core when an accident or the like occurs in a nuclear reactor while the operation of the nuclear reactor is stopped. This passive cooling facility is designed to be operated for about 3 days without using power when removing residual heat from the core.

It is a global trend to restrict the user's ability to intervene in a nuclear reactor after about three days after the accident in the nuclear reactor. Therefore, the passive cooling system should be able to remove the residual heat of the core for more than 3 days.

Such passive cooling equipment needs to be applied to nuclear reactors installed on ships as well as nuclear reactors installed on land. However, in the case of a ship, since an accident may occur in a harsher environment than on land, it may be difficult for the user to intervene even when three days have elapsed after the accident.

On the other hand, most passive cooling facilities installed on land have a structure in which a huge water tank is installed on top of a heat source. It is not easy to install a passive cooling facility equipped with such a huge water tank on a ship that can easily generate vibrations because it is necessary to install the water tank at a very high position.

Republic of Korea Patent No. 10-1915977 (2018.11.01.)

Embodiments of the present invention were invented in the background as described above, and an object of the present invention is to provide a passive cooling device capable of removing core residual heat of a nuclear reactor over a longer period of time than 3 days.

In addition, an object of the present invention is to provide a passive cooling device capable of removing residual heat by obtaining fluid driving force using the principle of natural circulation.

According to an aspect of the present invention, a first passive heat exchanger for exchanging heat to be transferred by air; an inner housing having upper and lower portions open and the first passive heat exchanger disposed therein; a housing disposed to surround the inner housing and accommodating water therein; a boiling pot disposed in the lower portion of the inner housing and receiving water supplied from the housing; and a second passive heat exchanger disposed inside the boiling pot and exchanging heat transferred through the first passive heat exchanger with water by means of water, a passive cooling device may be provided.

According to embodiments of the present invention, the passive cooling device is disposed above the heat source, but the passive cooling device has a performance sufficient to generate a driving force by natural circulation, and most residual heat is disposed in the horizontal direction or at the bottom. Since it can be removed through the ground part, residual heat of the core, which is a heat source, can be removed through natural circulation.

In addition, residual heat of the core is removed by using water while there is water in the passive cooling device, and the residual heat of the core is removed by air cooling using air flowing through the inner housing even after all the water in the passive cooling device is exhausted. Therefore, there is an effect that passive cooling can be performed for a long period of time from the initial stage.

1 is a schematic diagram for explaining the principle of a passive cooling facility according to an embodiment of the present invention.
2 is a schematic diagram for explaining a configuration for preventing the medium moving from the passive cooling equipment to the passive cooling device according to an embodiment of the present invention from freezing.
3 is a view showing a passive cooling device of a passive cooling facility according to an embodiment of the present invention.
4 is a view for explaining the operation of the passive cooling device of the passive cooling facility according to an embodiment of the present invention.

Hereinafter, specific embodiments for implementing the present invention will be described in detail with reference to the drawings.

In addition, in the description of the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

In addition, when it is said that a component is 'connected', 'supported', 'connected', 'supplied', 'transferred', or 'contacted' to another component, it is directly connected, supported, connected, It should be understood that supply, delivery, and contact may occur, but other components may exist in between.

The terminology used herein is only used to describe specific embodiments and is not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise.

In addition, in the present specification, the expressions of the upper side, the lower side, the side surface, etc. are described with reference to the drawings in the drawings, and it is disclosed in advance that if the direction of the corresponding object is changed, it may be expressed differently. For the same reason, some components are exaggerated, omitted, or schematically illustrated in the accompanying drawings, and the size of each component does not fully reflect the actual size.

Also, terms including an ordinal number such as 1st, 2nd, etc. may be used to describe various components, but the components are not limited by these terms. These terms are used only for the purpose of distinguishing one component from another.

The meaning of "comprising," as used herein, specifies a particular characteristic, region, integer, step, operation, element and/or component, and other specific characteristic, region, integer, step, operation, element, component, and/or group. It does not exclude the existence or addition of

Referring to FIG. 1 , a passive cooling facility 10 according to an embodiment of the present invention includes a heat source unit 100 , a passive cooling device 200 , and a ground unit 300 .

The heat source unit 100 is a cooling target of the passive cooling facility 10 as a configuration in which heat is generated. For example, the heat source unit 100 in this embodiment may be a nuclear reactor. And a core may be disposed inside the nuclear reactor. Heat generated in the core of such a nuclear reactor may be heat exchanged in a steam generator included in the nuclear reactor, and steam may be generated in the steam generator.

And the steam generated in the steam generator may lose most of the thermal energy through the steam turbine 400 and may be discharged to the outside through the condenser 500 .

In this way, the heat source unit 100 may include a heat source heat exchanger 110 for heat exchange within the heat source unit 100 .

In the passive cooling device 200 , heat is transferred from the heat source unit 100 when the operation of the heat source unit 100 is stopped due to an accident. As shown in FIG. 2 , when the heat source unit 100 operates normally, the heat generated from the heat source unit 100 is moved to the steam turbine 400 side in the form of steam, but an accident occurs in the heat source unit 100 . When it is stopped and generated, it may be moved to the passive cooling device 200 side.

To this end, when an accident occurs, a driven valve (not shown) for switching the steam discharged from the heat source unit 100 to the passive cooling device 200 side instead of the steam turbine 400 side may be installed. Such a driven valve may be installed in the connection pipe CP connecting the heat source unit 100 and the passive cooling device 200 .

Here, the medium for transferring heat in the passive cooling facility may be water and may be in the form of steam depending on the temperature.

At this time, the driven valve is closed so that the steam generated from the heat source unit 100 is transferred to the steam turbine 400 side when power is supplied, and when the supplied power is cut off, the steam generated from the heat source unit 100 is driven It may be opened to be transferred to the cooling device 200 side.

The passive cooling device 200 is disposed above the heat source unit 100 to remove heat generated from the heat source unit 100, and heat transferred in the form of steam enough to generate a driving force by natural circulation. can be removed.

That is, the passive cooling device 200 may be disposed above the heat source 100 to such an extent that the heat generated from the heat source 100 can be transferred by natural convection.

The heat generated in the heat source 100 is discharged from the heat source 100 in the form of high-temperature water or steam, and since it has a lower density than water at the inlet side of the heat source 100, it moves upward.

Accordingly, the heat generated by the heat source 100 may be transferred to the passive cooling device 200 disposed above the heat source 100 .

The heat generated by the heat source unit 100 is cooled to a certain degree or less in the passive cooling device 200 . For this, a passive heat exchanger 210 may be disposed in the passive cooling device 200 .

At this time, the water or steam cooled in the passive cooling device 200 has a relatively high density, and as it moves downward from the passive cooling device 200 disposed on the upper part, it is transferred to the heat source part 100 through the ground part 300 . A driving force that can be generated can be generated.

That is, as the fluid cooled in the passive cooling device 200 moves by its own weight toward the ground unit 300 , the driving force capable of circulating the heat source unit 100 , the passive cooling device 200 , and the ground unit 300 is provided. can occur

Here, if the passive cooling facility 10 according to the present embodiment is installed on a ship as an example, the heat source unit 100 is disposed inside the ship, and the passive cooling device 200 is disposed outside the ship. can be

In particular, the passive cooling device 200 may be disposed on the outside of the ship, and disposed at a higher position than the heat source unit 100 .

The passive cooling device 200 is disposed on the outside of the ship because the passive cooling device 200 is used when the operation of the heat source unit 100 is stopped due to the occurrence of an accident. Because it is often low.

In addition, the heat of the heat source unit 100 is not directly affected by the passive cooling device 200 .

As the passive cooling device 200 , a water cooling device cooling using water may be used, or an air cooling device cooling using air may be used. Alternatively, a cooler for cooling using both water and air may be used as needed.

The ground unit 300 is provided to cool the heat generated by the heat source unit 100 . In the ground unit 300 , a large amount of cooling water may be disposed therein for cooling, and partially cooled heat may be cooled through the passive cooling device 200 .

The ground unit 300 may be a cooling tank that is separately provided and accommodates cooling water. However, the present invention is not limited thereto, and a separate tank is not provided, and the temperature of the sea can be used directly. That is, the ground unit 300 may be the sea.

A ground heat exchanger 310 for cooling heat is disposed in the ground unit 300 , and heat exchange may be performed in a state in which the ground heat exchanger 310 is exposed to the sea and is disposed to be in direct contact with seawater.

For example, in the case of a ship, the ground heat exchanger 310 is exposed to the outside and is in direct contact with seawater to be cooled by seawater.

The ground unit 300 may use seawater from the sea as it is, and may use the temperature of the seawater to cool the heat discharged from the heat source unit 100 . Therefore, in the case of a ship, the heat generated from the heat source unit 100 can be cooled more effectively in an area where the temperature of seawater is low.

At this time, as shown in FIG. 2 , in the passive cooling facility, when the heat source unit 100 operates normally, the connection pipe CP connecting between the heat source unit 100 and the passive cooling device 200 is in an accident. It can be filled with water at any time to be prepared.

When such a passive cooling facility is installed in a vessel, the vessel may move to an area where the ambient temperature is below zero, and accordingly, when the connecting pipe CP is exposed to the outside, the water inside the connecting pipe CP may be frozen.

When the connector CP is frozen in this way, there is a risk that the connector CP may be damaged. In order to prevent freezing of the connection pipe CP, an electric heating wire may be installed in the connection pipe CP or the heat of the heat source part 100 may be branched to the connection pipe CP, but this is not economical.

Accordingly, in order to prevent the connection pipe CP from being frozen, heat discharged from the steam turbine 400 to the condenser 500 may be supplied to the connection pipe CP while the heat source unit 100 is operating normally. . At this time, the heat supplied from the steam turbine 400 to the connection pipe CP may be supplied in the form of steam.

In addition, since the water accommodated in the condenser 500 is room temperature or water having a high temperature, it may be supplied to the connection pipe CP using the third pump P3 .

Therefore, as the steam discharged from the steam turbine 400 or water contained in the condenser 500 is supplied to the connection pipe CP, it is possible to prevent the water in the connection pipe CP from freezing.

At this time, a check valve may be installed in the pipe for supplying steam from the steam turbine 400 to the connection pipe (CP), and a check valve is installed in the pipe for supplying water from the condenser 500 to the connection pipe (CP). can be installed.

This is to prevent steam from moving to the steam turbine 400 or the condenser 500 when an accident occurs, when steam is supplied from the heat source unit 100 to the passive cooling device 200 .

In this case, even when the heat source unit 100 is normally operated, the passive cooling device 200 may cool and discharge the temperature of the water supplied through the connection pipe CP.

As described above, in the passive cooling device 200 to prevent the connection pipe (CP) from freezing, while the heat source unit 100 operates normally, the steam supplied from the steam turbine 400 or the condenser 500 or water may be provided.

Accordingly, when steam or water is supplied from the steam turbine 400 or the condenser 500 , the passive cooling device 200 may cool and discharge the temperature of the supplied steam or water.

The condenser 500 may supply water accommodated therein to the heat source unit 100 while the heat source unit 100 is normally operated by using the first pump P1 . In addition, the cooling water supplied from the ground unit 300 to the plurality of heat exchangers 510 installed in the condenser 500 may be supplied using the second pump P2 .

Accordingly, in the condenser 500 , the steam supplied from the steam turbine 400 may be cooled by the cooling water supplied from the ground unit 300 .

Next, the passive cooling device 200 will be described in more detail using the drawings shown in FIGS. 3 and 4 .

The passive cooling device 200 may cool the temperature of steam or water supplied through the connection pipe CP. As described above, the passive cooling device 200 is provided to remove residual heat generated from the heat source unit 100 when the operation of the heat source unit 100 is stopped due to an accident, and for this purpose, the heat source unit 100 ) can be supplied through the connection pipe (CP).

In this embodiment, the passive cooling device 200 may cool the steam using both water and air, as shown in FIG. 3 . That is, the passive cooling device 200 may cool the supplied steam by a water cooling method or an air cooling method.

The passive cooling device 200 includes a first passive heat exchanger 212 , a second passive heat exchanger 214 , a housing 220 , an inner housing 230 , a vapor chamber 240 , a spray 250 , and boiling. It includes a pot (Boiling Pot, 260) and a pot connector (270).

The first passive heat exchanger 212 is disposed inside the inner housing 230 , and external air is supplied from a lower portion of the inner housing 230 and uses the supplied air to cool heat. The first passive heat exchanger 212 is an air-cooled heat exchanger.

The second passive heat exchanger 214 is disposed inside the boiling pot 260 and cools the heat using the water filled in the boiling pot 260 . At this time, water is supplied from the lower portion to the boiling pot 260 , and heat exchange is performed through the second passive heat exchanger 214 , and water in the boiling pot 260 may be evaporated by heat exchange. This second passive heat exchanger 214 is a water-cooled heat exchanger.

The housing 220 has an open upper surface and a closed lower surface. And the housing 220 has a hollow inside which can be filled with water. The water filled in the housing 220 may be supplied to the boiling pot 260 so that heat exchange can be performed in a water-cooled manner in the second passive heat exchanger 214 .

The vapor transfer pipe 222 may be disposed inside the housing 220 , one end disposed in the boiling pot 260 , and the other end disposed inside the vapor chamber 240 . That is, the vapor transfer pipe 222 may transfer the vapor generated in the boiling pot 260 to the vapor chamber 240 .

The inner housing 230 may have an open lower surface and an upper surface, and may have a hollow inside. As the lower end of the inner housing 230 and the lower end of the housing 220 are connected, a space in which water can be accommodated may be formed between the outer surface of the inner housing 230 and the inner surface of the housing 220 .

That is, the hollow provided inside the housing 220 may be a space between the inner housing 230 and the housing 220 .

In this case, the inner housing 230 and the housing 220 may be integrally formed by connecting the lower ends.

In addition, the inner housing 230 has an open upper surface and a lower surface and a hollow inside, and may have a shape in which the width becomes narrower from the lower part to the upper part.

As the inner shape of the inner housing 230 has a shape that becomes narrower toward the upper side, the moving speed may gradually increase as the air introduced into the inner housing 230 moves upward through the open lower surface.

At this time, the opened lower surface of the inner housing 230 may be in a completely open state, but is not limited thereto, and may not be completely opened since it may have a structure through which air can flow.

That is, a plate having a plurality of air holes formed thereon may be disposed on the lower surface of the inner housing 230 . The plurality of air holes formed in the plate may be formed as large as possible for smooth inflow of air.

A vapor inlet 232 may be disposed on the upper end of the inner housing 230 . The vapor inlet 232 may be disposed on the upper end of the inner housing 230 , and may be integrally formed with the inner housing 230 .

The vapor inlet 232 may have a cylindrical shape with upper and lower open portions. In addition, a plurality of vapor through-holes SH may be formed on the outer circumferential surface of the vapor inlet 232 .

The vapor through hole (SH) is formed to introduce steam from the outside to the inside of the vapor inlet (232). Accordingly, the steam introduced into the steam inlet 232 may be discharged to the upper portion of the steam inlet 232 .

The vapor chamber 240 is disposed on the upper end of the inner housing 230 . The vapor chamber 240 is disposed to surround the outer circumferential surface of the upper end of the inner housing 230 , and may have a shape in which the upper and lower surfaces are closed.

The upper end of the vapor chamber 240 may be coupled to the upper end of the vapor inlet 232 disposed on the upper end of the inner housing 230 , and the lower end of the vapor chamber 240 is on the outer peripheral surface of the inner housing 230 . can be combined.

In this case, a plurality of chamber holes 242 may be formed in a side surface of the vapor chamber 240 . Accordingly, water contained in the housing 220 may be introduced into the vapor chamber 240 through the plurality of chamber holes 242 .

In the vapor chamber 240, a vapor transfer pipe 222 may be coupled to a lower portion in a state in which water is accommodated therein. That is, the vapor generated in the boiling pot 260 may be transferred and introduced into the vapor chamber 240 through the vapor transfer pipe 222 .

In this case, the end of the vapor transfer pipe 222 may be disposed to be submerged in the water accommodated in the vapor chamber 240 . Accordingly, the vapor transferred through the vapor transfer pipe 222 may be partially condensed by water disposed in the vapor chamber 240 .

The vapor inlet 232 of the inner housing 230 is disposed on the inside of the vapor chamber 240 , and the vapor moved to the vapor chamber 240 accordingly passes through the vapor through hole SH of the vapor inlet 232 . can be discharged to the outside.

By forming a dynamic pressure at the upper portion of the inner housing 230 by the vapor discharged through the vapor through hole SH, the static pressure at the upper end of the inner housing 230 may be reduced. Accordingly, the air moving from the lower part to the upper part of the inner housing 230 and exiting through the upper part of the inner housing 230 can be quickly discharged to the outside, so that the flow of air inside the inner housing 230 can be more smoothly. can do.

The spray 250 may be disposed inside the inner housing 230 . The spray 250 may receive water accommodated in the housing 220 and spray it on the inner housing 230 . Here, the spray 250 may be disposed on the inner housing 230 .

The spray 250 may operate until the water contained in the housing 220 decreases to a certain level or less, and the water level of the water contained in the housing 220 is lowered so that the water is not supplied to the spray 250 in the inner housing 230 . ) can be sprayed with water.

By spraying water on the inner housing 230 using the spray 250 in this way, the efficiency when heat exchange is performed by air cooling in the first passive heat exchanger 212 can be increased.

Here, a driven valve (not shown) may be installed in the spray 250 . The driven valve blocks so that water is not sprayed from the spray 250 when power is supplied, and is opened when the power is cut off to operate so that water is sprayed from the spray 250 .

That is, when the driven valve is opened, the water accommodated in the housing 220 may move by its own weight and may be sprayed into the inner housing 230 through the spray 250 .

In other words, when the power supplied to the driven valve is cut off, the operation of the heat source unit 100 is stopped. It is in a state in which the heat generated in the unit 100 can no longer be cooled.

Accordingly, the power supplied to the driven valve is cut off and opened, thereby removing residual heat generated from the heat source unit 100 using the passive cooling device 200 .

The boiling pot 260 is disposed under the inner housing 230 and may have a predetermined space therein. A second passive heat exchanger 214 may be disposed inside the boiling pot 260 .

The second passive heat exchanger 214 may exchange heat with water after passing through the first passive heat exchanger 212 . To this end, the boiling pot 260 may be filled with water, and the water accommodated in the housing 220 may be supplied through the pot connector 270 .

At this time, the pot connector 270 has one end connected to the lower portion of the housing 220 and the other end connected to the lower portion of the boiling pot 260 . Therefore, the water accommodated in the housing 220 may be supplied to the lower portion of the boiling pot 260 through the pot connector 270 .

In addition, the boiling pot 260 is connected to the steam transfer pipe 222 at the top. The steam transfer pipe 222 transfers the steam generated in the boiling pot 260 to the steam chamber.

The boiling pot 260 may be sealed inside, and water may be supplied through the pot connector 270 disposed below.

Therefore, as heat exchange is performed in the second passive heat exchanger 214 , the water accommodated in the boiling pot 260 may be evaporated to generate steam. The steam generated in this way may be transferred to the vapor chamber 240 through the vapor transfer pipe 222 connected to the upper portion of the boiling pot 260 .

After being cooled by heat exchange through the second passive heat exchanger 214 in the boiling pot 260 , the heat exchange medium may be transferred back to the heat source unit 100 .

Alternatively, after heat exchange in the second passive heat exchanger 214 , as shown in FIG. 1 , the heat exchange medium may be transferred to the heat source unit 100 after heat exchange is performed again through the ground unit 300 .

The cooling fins 262 are disposed to surround the outer peripheral surface of the boiling pot 260 . The cooling fins 262 may generate steam by heating the water in the boiling pot 260 due to heat exchange by the second passive heat exchanger 214, and serves to transfer the heat to the outside.

The heat transferred to the cooling fins 262 may be heat exchanged again by flowing air. That is, the cooling fins 262 can heat the air flowing into the inner housing 230 from the bottom to increase the buoyancy of the air, and thereby the air inside the inner housing 230 is heated. It can flow more smoothly.

Here, air is introduced from the lower part of the inner housing 230 , and the air flow speed increases while the air moves upward according to the shape of the inner housing 230 , and the air is discharged through the upper part of the inner housing 230 . .

In this process, heat exchange is performed in the first passive heat exchanger 212 , and the cooling fins 262 serve to more smoothly flow air from the lower part to the upper part of the inner housing 230 .

In addition, as the air moves rapidly from the bottom to the top inside the inner housing 230 as described above, the water sprayed from the spray 250 does not directly fall to the lower part of the inner housing 230 by the load, and the inside It can stay inside the housing 230 for a longer period of time.

Accordingly, as the amount of time the water dispersed in the spray 250 stays inside the inner housing 230 increases, heat exchange efficiency in the first passive heat exchanger 212 may increase.

In this embodiment, as shown in FIG. 3 , the passive cooling device 200 has water inside the housing 220 and the boiling pot 260 when the heat exchange medium is not supplied through the connection pipe CP. It remains filled.

And as in FIG. 2, when steam or high-temperature water is supplied from the steam turbine 400 or the condenser 500 through the connection pipe (CP), the first passive heat exchanger 212 and the second passive heat exchanger ( 214), heat exchange may be performed, respectively.

Here, since the heat source 100 is normally operated when steam or high-temperature water is supplied from the steam turbine 400 or the condenser 500 through the connection pipe CP, a driven valve installed in the spray 250 . remains closed. That is, the spray 250 does not operate.

And when the operation of the heat source unit 100 is stopped (emergency stop, etc.), heat is transferred directly from the heat source unit 100, and the passive cooling device 200, as shown in FIG. In operation, heat exchange may be performed in an air-cooled manner in the first passive heat exchanger 212 , and water-cooled heat exchange by water may be performed in the second passive heat exchanger 214 .

The spray 250 may operate until the water level of the water accommodated in the housing 220 is lowered to a certain level.

In the second passive heat exchanger 214 , heat exchange may be continued until all the water contained in the housing 220 is exhausted and all the water inside the boiling pot 260 is evaporated. The core corresponding to the heat source 100 continuously generates residual heat even in an emergency stop state due to an accident or the like, and the residual heat may decrease as time passes.

Therefore, in the initial stage when the heat source unit 100 is stopped, the operation of the spray 250 increases the heat exchange efficiency of the air-cooling method made in the first passive heat exchanger 212 , and also water-cooling through the second passive heat exchanger 214 . method of heat exchange.

And the operation of the spray 250 is stopped step by step, and the second passive heat exchanger 214 may be operated until all the water in the housing 220 is consumed.

This is because the heat generated during the initial period of time (about 3 days) is relatively high. Here, the water accommodated in the housing 220 may be such that heat exchange can be performed in the second passive heat exchanger 214 until the release rate of residual heat generated in the core becomes about 1% of the total output of the core.

Since the first passive heat exchanger 212 operates in an air-cooling manner, heat exchange may be continuously performed by the air supplied from the lower portion of the inner housing 230 even if water is not sprayed from the spray 250 .

Therefore, the first passive heat exchanger 212 can continuously remove heat generated from the heat source unit 100 even if a separate supply is not made.

Although the embodiments of the present invention have been described as specific embodiments, these are merely examples, and the present invention is not limited thereto, and should be construed as having the widest scope according to the embodiments disclosed herein. A person skilled in the art may implement a pattern of a shape not specified by combining/substituting the disclosed embodiments, without departing from the scope of the present invention. In addition, those skilled in the art can easily change or modify the disclosed embodiments based on the present specification, and it is clear that such changes or modifications also fall within the scope of the present invention.

10: passive cooling equipment
100: heat source 110: heat source heat exchanger
200: passive cooling device 210: passive heat exchanger
212: first passive heat exchanger 214: second passive heat exchanger
220: housing 222: steam transfer pipe
230: inner housing 232: vapor inlet
240: vapor chamber 242: chamber hall
250: spray
260: boiling pot 262: cooling fins
270: pot connector
300: ground unit 310: ground heat exchanger
400: steam turbine
500: condenser 510: condenser heat exchanger
CP: connector
P1: first pump P2: second pump
P3: third pump
SH: vapor through hole

Claims (6)

a first passive heat exchanger for exchanging the transferred heat with air;
an inner housing having an upper portion and an open lower portion, the first passive heat exchanger being disposed therein;
a housing disposed to surround the inner housing and accommodating water therein;
a boiling pot disposed on the lower portion of the inner housing and receiving water supplied from the housing; and
It is disposed inside the boiling pot and comprises a second passive heat exchanger for exchanging heat transferred through the first passive heat exchanger by water,
passive cooling device. The method of claim 1,
a vapor chamber disposed on an upper end of the inner housing to surround the inner housing;
a vapor transfer pipe for transferring the vapor generated in the boiling pot to the vapor chamber by the second passive heat exchanger; and
It is coupled to the upper end of the inner housing, further comprising a vapor inlet portion formed with a vapor through-hole so that the vapor transferred to the vapor chamber is moved to the inside of the inner housing,
passive cooling device. The method of claim 1,
The lower end of the inner housing and the lower end of the housing are connected and integrally formed, and water is accommodated between the inner housing and the housing,
passive cooling device. The method of claim 1,
It is disposed inside the inner housing, further comprising a spray for spraying water accommodated in the housing to the first passive heat exchanger,
The spray sprays water to the first passive heat exchanger when the operation of the heat source for transferring heat to the first passive heat exchanger is stopped.
passive cooling device. 5. The method of claim 4,
The inner housing has a shape that becomes narrower from the bottom to the top so that air flows from the bottom to the top,
passive cooling device. 6. The method of claim 5,
Further comprising a cooling fin disposed to surround the outer peripheral surface of the boiling pot to vaporize the buoyancy of the air in the lower portion of the inner housing,
passive cooling device.

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