JP7266482B2 - cooling system - Google Patents

Description

The present invention relates to cooling systems.

Conventionally, from the viewpoint of environmental protection, liquefied natural gas (LNG) and other liquefied natural gas (LNG) have been used as fuel for ships in some cases to reduce CO ₂ . As such a ship, the one shown in Patent Document 1 is known. This ship has a liquefied gas fuel tank for storing liquefied gas fuel in its hull.

Japanese Unexamined Patent Application Publication No. 2012-121401

Here, in recent years, due to the demand for further environmental protection, there are cases where ships are provided with liquid tanks to be cooled, such as urea water tanks and sodium hydroxide tanks, for the purpose of performing exhaust gas treatment. The urea water needs to be kept below a predetermined temperature in order to prevent deterioration. Sodium hydroxide also needs to be cooled in some cases. Therefore, in some cases, a liquid tank to be cooled, such as a urea water tank or a sodium hydroxide tank, is cooled with seawater. However, this method cannot sufficiently cool the liquid to be cooled in sea areas where the water temperature is high. Therefore, it becomes necessary to equip the ship with equipment dedicated to cooling such as a chiller for cooling the liquid to be cooled. However, providing a dedicated cooling device such as a chiller poses a problem of a significant increase in cost and an increase in power consumption.

The present invention has been made to solve such problems, and provides a cooling system capable of suppressing the deterioration of the liquid to be cooled in the tank of the liquid to be cooled without using a dedicated cooling device such as a chiller. intended to provide

The cooling system of the present invention is a cooling system for cooling a liquid to be cooled that needs to be cooled on a ship, and includes a liquid to be cooled tank that stores the liquid to be cooled, a liquefied gas fuel tank that stores liquefied gas fuel, a heat A heating unit that heats the liquefied gas fuel using a medium, a heat medium supply system that supplies the heat medium to the heating unit, and an object to be cooled using the heat medium that is provided in the heat medium supply system and whose temperature has decreased in the heating unit. a cooling unit for cooling the liquid.

A cooling system of the present invention includes a liquefied gas fuel tank that stores liquefied gas fuel, a heating unit that heats the liquefied gas fuel using a heat medium, and a heat medium supply system that supplies the heat medium to the heating unit. . Since the liquefied gas fuel has a low temperature, the heat medium is cooled by heating the liquefied gas fuel in the heating unit. On the other hand, the cooling system is provided in the heat medium supply system and includes a cooling section that cools the liquid to be cooled using the heat medium whose temperature has been lowered by the heating section. As a result, the cooling section can cool the liquid to be cooled by effectively utilizing the cooling capacity of the heat medium that has reached a low temperature in the heating section. The heating unit and heat transfer medium supply system are already installed in ships having liquefied gas fuel tanks. In other words, the cooling system can cool the liquid to be cooled using an existing structure without using equipment dedicated to cooling such as a chiller. As described above, deterioration of the liquid to be cooled in the liquid tank to be cooled can be suppressed without using a device dedicated to cooling such as a chiller.

The cooling system according to the present invention may further include a heat medium heating section that is provided in the heat medium supply system and heats the heat medium whose temperature has been lowered in the heating section. In this case, the heat medium heating section can heat the low-temperature heat medium after heating the liquefied gas fuel in the heating section, and return it to the original temperature.

In the cooling system according to the present invention, in the heat medium supply system, the cooling section and the heat medium heating section may be provided in the order of the cooling section and the heat medium heating section with respect to the flow of the heat medium. In this case, the cooling unit is supplied with the heat medium in a stage prior to being heated by the heat medium heating unit. Therefore, the cooling capacity of the cooling section can be improved.

In the cooling system according to the present invention, in the heat medium supply system, the cooling section and the heat medium heating section may be provided in the order of the heat medium heating section and the cooling section with respect to the flow of the heat medium. In this case, the temperature of the heat medium can be increased by the heat medium heating section before the heat medium is supplied to the cooling section. As a result, it is possible to prevent the liquid to be cooled from being excessively cooled by the heat medium in the cooling unit.

In the cooling system according to the present invention, the cooling section and the heat medium heating section may be provided in parallel in the heat medium supply system. In this case, it is possible to easily adjust the cooling capacity and heating capacity of each part by simply adjusting the flow rate of the heat medium to the cooling part and the heat medium heating part.

ADVANTAGE OF THE INVENTION According to this invention, the cooling system which can suppress deterioration of the cooling object liquid of a cooling object liquid tank can be provided, without using the apparatus only for cooling, such as a chiller.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic side view which shows an example of the ship to which the cooling system which concerns on embodiment of this invention is applied. 1 is a schematic configuration diagram showing a system configuration of a cooling system according to an embodiment; FIG. FIG. 2 is a schematic configuration diagram showing a piping configuration around a heat medium heater and a liquid cooler to be cooled; FIG. 2 is a schematic configuration diagram showing an example of a liquid cooler to be cooled; FIG. 2 is a schematic configuration diagram showing an example of a liquid cooler to be cooled; FIG. 11 is a schematic configuration diagram showing a piping configuration around a heat medium heater and a liquid cooler to be cooled in a cooling system according to a modification; FIG. 11 is a schematic configuration diagram showing a piping configuration around a heat medium heater and a liquid cooler to be cooled in a cooling system according to a modification;

Preferred embodiments of the cooling system of the present invention will be described below with reference to the drawings. In the following explanation, the terms "front" and "rear" correspond to the direction of travel of the hull, and the term "lateral" corresponds to the lateral (width) direction of the hull. The term "bottom" corresponds to the vertical direction of the hull.

FIG. 1 is a schematic side view showing an example of a ship to which a cooling system according to an embodiment of the invention is applied. A ship 1 to which the cooling system 100 is applied is a ship that transports petroleum-based liquid cargo such as crude oil and liquid gas, for example, an oil tanker. Note that the vessel is not limited to an oil tanker, and may be, for example, a double hull bulk carrier. Moreover, the ship 1 uses liquefied gas fuel as fuel. As the liquefied gas fuel, for example, LNG (Liquefied Natural Gas) is used. The ship 1 may use only liquefied gas fuel as fuel, or may use both liquefied gas fuel and liquid fuel.

The ship 1 includes a hull 11 and a propeller 12, as shown in FIG. The hull 11 has a bow section 2 , a stern section 3 , an engine room 4 , a pump room 5 and a cargo room 6 . The bow section 2 is located on the front side of the hull 11 . The stern portion 3 is positioned on the rear side of the hull 11 . The bow 2 has a shape designed to reduce wave-making resistance in, for example, a full draft. The propulsion device 12 propels the hull 11, and uses, for example, a screw shaft. The propeller 12 is installed below the waterline (surface of the seawater W) in the stern portion 3 . A rudder 15 for adjusting the direction of propulsion is installed below the waterline in the stern portion 3 .

The engine room 4 is provided at a position adjacent to the bow side of the stern portion 3 . The engine room 4 is a section for arranging an engine 16 for applying driving force to the propeller 12 . The pump room 5 is provided at a position adjacent to the engine room 4 on the bow side. The pump chamber 5 is a section in which a pump and the like are arranged. A cargo compartment 6 is provided between the bow section 2 and the pump compartment 5 . Cargo compartment 6 is a compartment for containing petroleum-based cargo. The cargo compartment 6 is divided into a cargo oil tank and a ballast tank by adopting a double hull structure. The cargo oil tank loads petroleum-based cargo carried by the ship 1 . A ballast tank accommodates the amount of ballast water according to the weight of the petroleum-based cargo loaded in the cargo oil tank.

A deck 19 is provided on the upper part of the hull 11 . A liquefied gas fuel tank 21 for storing liquefied gas fuel is provided on the deck 19 . A liquefied gas fuel tank 21 supplies liquefied gas fuel to the engine 16 . A liquid-to-be-cooled tank 22 for storing the liquid to be cooled is provided in the hull 11 . The liquid to be cooled is a liquid that needs to be cooled in the ship 1, and examples thereof include liquids such as urea water, sodium hydroxide, and marine gas oil (MGO). The liquid tank 22 to be cooled is provided so as to straddle the engine room 4 and the pump room 5 at a position on the ship bottom 20 side. When the liquid tank 22 to be cooled stores the urea water, the liquid tank 22 to be cooled is equipped with SCR (Selective Catalytic Reduction) for reducing NOx in the exhaust gas generated with the operation of the engine 16. Urea water is supplied to the system 25 as a liquid to be cooled. The SCR system 25 treats NOx in the exhaust gas by using ammonia produced from urea as a reducing agent. When sodium hydroxide liquid is used as the liquid to be cooled, the sodium hydroxide liquid may be used in an EGR (Exhaust Gas Recirculation) system for reducing NOx. The EGR system has a process of supplying part of the exhaust gas to a scrubber and removing SOx in the exhaust gas using scrubber water in the scrubber. Sodium hydroxide is used to neutralize the scrubber water. Marine gas oil (MGO) represents a low-sulfur fuel and is sometimes used as a fuel for marine engines when navigating designated waters.

Next, a cooling system 100 according to this embodiment will be described with reference to FIG. FIG. 2 is a schematic configuration diagram showing the system configuration of the cooling system 100 according to this embodiment. The cooling system 100 is a system for cooling liquid to be cooled on the ship 1 . Since the liquid to be cooled must be kept at a low temperature (for example, 25° C.), a cooling means is required. Here, since the liquid to be cooled tank 22 is arranged on the ship bottom side (see FIG. 1), the liquid to be cooled can be cooled by the seawater W when the temperature of the seawater W is low. However, in a sea area where the temperature of the seawater W is high, the cooling target liquid cannot be cooled using the seawater W, so the cooling system 100 is used to cool the cooling target liquid. In the ship 1 , the liquefied gas fuel is heated with a heat medium and used in the engine 16 . Since the liquefied gas fuel is a low temperature substance, the heat medium also becomes low temperature by heating the liquefied gas fuel. The cooling system 100 is a system that cools the liquid to be cooled using the heat medium that has become low temperature in this way.

As shown in FIG. 2, the cooling system 100 includes a liquefied gas fuel tank 21, a liquid to be cooled tank 22, a heat medium tank 23, a liquefied gas fuel heater 24 (heating section), and a heat medium supply system 32. , a heat medium heater 26 (heat medium heating section) and a liquid cooler 27 (cooling section) to be cooled.

The liquefied gas fuel heater 24 is a device that heats the liquefied gas fuel using a heat medium. The liquefied gas fuel heater 24 allows the heat medium to pass through a heat medium flow line L2 described later and the liquefied gas fuel to pass through a fuel flow line L1 described later, so that the heat medium and the liquefied gas fuel heat exchange between Thereby, the liquefied gas fuel is heated by the heat from the heat medium. Although the arrangement of the liquefied gas fuel heater 24 is not particularly limited, for example, it is arranged in the engine room 4 (see FIG. 1).

A pump 31 is provided in the liquefied gas fuel tank 21 . The pump 31 supplies the liquefied gas fuel to the liquefied gas fuel heater 24 by pumping the liquefied gas fuel in the liquefied gas fuel tank 21 to the fuel distribution line L1. The heated fuel is supplied to the engine 16 via the fuel distribution line L1.

The heat medium tank 23 is a tank that stores a heat medium. The heat medium is preferably one that does not freeze even when heat is exchanged with a low-temperature liquefied gas fuel tank, such as glycol. The heat medium supply system 32 is a circulation system that supplies the heat medium to the liquefied gas fuel heater 24 by circulating the heat medium. The heat medium supply system 32 includes a heat medium flow line L<b>2 and a pump 33 . The heat medium flow line L2 is connected so as to be pulled out from the heat medium tank 23, pass through the liquefied gas fuel heater 24, and return to the heat medium tank 23. The pump 33 supplies the heat medium to the liquefied gas fuel heater 24 by pumping the heat medium in the heat medium tank 23 to the heat medium flow line L2. The heat medium whose temperature has been lowered by heating the liquefied gas fuel passes through the heat medium flow line L2 and is returned to the heat medium tank 23 . For example, the heat medium has a temperature of about 40.degree. C. before passing through the liquefied gas fuel heater 24 and a temperature of about 20.degree. Although the arrangement of the heat medium tank 23 is not particularly limited, it may be arranged on the deck 19 (see FIG. 1).

The cooling target liquid cooler 27 is a device that is provided in the heat medium supply system 32 and uses the heat medium whose temperature has been lowered by the liquefied gas fuel heater 24 to cool the cooling target liquid. The heat medium distribution line L2 of the heat medium supply system 32 passes through the liquid cooler 27 to be cooled. The cooling target liquid tank 22 is thermally connected to the cooling target liquid cooler 27 . As a result, the liquid cooler 27 to be cooled exchanges heat between the heat medium and the liquid to be cooled by allowing the heat medium to pass through the heat medium circulation line L2. Thereby, the liquid to be cooled is cooled by the heat medium, and the temperature of the liquid to be cooled is maintained at a desired temperature or lower. On the other hand, the heat medium takes heat from the liquid to be cooled, so that the temperature of the heat medium rises.

The heat medium heater 26 is a device that is provided in the heat medium supply system 32 and heats the heat medium whose temperature has been lowered by the liquefied gas fuel heater 24 . The heat medium heater 26 heats the heat medium using the heat of hot water or steam generated within the hull 11 . The heat medium flow line L<b>2 of the heat medium supply system 32 passes through the heat medium heater 26 . A heating medium flow line L3 through which a heating medium such as hot water or steam flows passes through the heat medium heater 26 . As a result, the heat medium heater 26 allows the heat medium to pass through the heat medium circulation line L2 and the heat medium to pass through the heating medium circulation line L3. heat exchange. As a result, the heat medium is heated by the heating medium, and the temperature of the heat medium rises. As a result, the heat medium is stored in the heat medium tank 23 in a state where the liquefied gas fuel tank can be heated by the liquefied gas fuel heater 24 again. The hot water or steam obtained by heating the heat medium with the heat medium heater 26 is returned to the heat source and circulated. Although the arrangement of the heat medium heater 26 is not particularly limited, it is arranged, for example, in the engine room 4 (see FIG. 1).

Next, referring to FIG. 3, the piping configuration around the heat medium heater 26 and the liquid cooler 27 to be cooled will be described. Each line in FIG. 3 is marked with an arrow pointing in the direction in which the fluid flows. When "upstream" and "downstream" are used in the following description, the arrows, that is, the flow of fluid, are used as references. FIG. 3 is a schematic configuration diagram showing a piping configuration around the heat medium heater 26 and the liquid cooler 27 to be cooled. As shown in FIG. 3, in the heat medium supply system 32, the cooling target liquid cooler 27 and the heat medium heater 26 are provided in the order of the cooling target liquid cooler 27 and the heat medium heater 26 with respect to the flow of the heat medium. Specifically, the heat medium distribution line L2 includes a line L11, a temperature control valve 41, a line L12, and a line L13. Also, the heating medium distribution line L3 includes a line L21, a temperature control valve 42, and a line L22.

A line L11 is a line extending from the liquefied gas fuel heater 24 (see FIG. 2). The temperature control valve 41 is a valve that adjusts the cooling capacity of the liquid cooler 27 to be cooled by adjusting the flow rate of the heat medium directed to the liquid cooler 27 to be cooled. A line L12 extends from the temperature control valve 41, passes through the liquid cooler 27 to be cooled and the heat medium heater 26, and heads for the heat medium tank 23 (see FIG. 2). In line L12, both are connected in series so that the heat medium heater 26 is arranged on the downstream side and the liquid cooler 27 to be cooled is arranged on the upstream side. The line L13 branches from the line L12 at the temperature control valve 41, bypasses the liquid cooler 27 to be cooled, and joins the line L12 at the junction P1.

Line L21 is a line extending from a source of hot water or steam. The temperature control valve 42 is a valve that adjusts the heating capacity of the heat medium heater 26 by adjusting the flow rate of the heat medium toward the heat medium heater 26 . A line L22 is a line that extends from the temperature control valve 42, passes through the heat medium heater 26, and heads for the discharge location.

The temperature control valves 41 and 42 described above are controlled by a controller 50 . The control unit 50 controls the entire cooling system 100 . The control unit 50 is composed of a CPU, a RAM, a ROM, an input/output interface, and the like. The control unit 50 is connected to the temperature control valves 41 and 42 and transmits control signals to them. The control unit 50 is also connected to a temperature sensor 61 provided in the cooling target liquid tank 22 and receives the temperature of the cooling target liquid detected by the temperature sensor 61 . The control unit 50 is connected to a temperature sensor 62 provided on the downstream side of the heat medium heater 26 on the line L12. to receive

Based on the detection results of the temperature sensors 61 and 62, the control unit 50 increases, decreases, or maintains the cooling capacity of the liquid cooler 27 to be cooled, and increases or decreases the heating capacity of the heat medium heater 26. , to determine whether to maintain When increasing the cooling capacity when the temperature of the liquid to be cooled approaches 25° C., the controller 50 controls the temperature control valve 41 to increase the flow rate of the heat medium to the line L12. As a result, the flow rate of the heat medium flowing through the liquid cooler 27 to be cooled is increased, so that the cooling capacity is improved and the temperature of the liquid to be cooled can be lowered. Alternatively, when increasing the cooling capacity, the controller 50 controls the temperature control valve 42 to decrease the flow rate of hot water or steam to the line L22. Thereby, the temperature rise of the heat medium in the heat medium heater 26 is suppressed. As a result, the temperature of the heat medium flowing through the liquid cooler 27 to be cooled is lowered, so that the cooling capacity is improved and the temperature of the liquid to be cooled can be lowered.

When the cooling capacity is lowered when the temperature of the liquid to be cooled approaches freezing, the controller 50 controls the temperature control valve 41 to reduce the flow rate of the heat medium to the line L12. As a result, the flow rate of the heat medium flowing through the liquid cooler 27 to be cooled is reduced, so that the cooling capacity is suppressed and the temperature of the liquid to be cooled can be increased (or maintained). Alternatively, when lowering the cooling capacity, the controller 50 controls the temperature control valve 42 to increase the flow rate of hot water or steam to the line L22. This promotes the temperature rise of the heat medium in the heat medium heater 26 . As a result, the temperature of the heat medium flowing through the liquid cooler 27 to be cooled increases, thereby reducing the cooling capacity and increasing (or maintaining) the temperature of the liquid to be cooled. The controller 50 maintains each flow rate when maintaining the cooling capacity. The control unit 50 may adjust the temperature control valve 41 and the temperature control valve 42 in combination, may adjust only the temperature control valve 41 , or may adjust only the temperature control valve 42 . The control unit 50 performs control so that the liquid to be cooled in the liquid to be cooled tank 22 is kept at a temperature of, for example, 25° C. or lower and 0° C. or higher. Thereby, it is possible to maintain a temperature that can suppress deterioration of the liquid to be cooled. Moreover, in order to achieve the original function of heating the liquefied gas fuel, it is desirable that the temperature of the temperature sensor 62 is above a certain level. Therefore, the controller 50 can also control the temperature control valve 42 to keep the temperature of the temperature sensor 62 above a certain level.

Next, an example of a specific structure of the liquid cooler 27 to be cooled will be described with reference to FIGS. 4 and 5. FIG. 4 and 5 are schematic configuration diagrams showing examples of liquid coolers to be cooled. As shown in FIG. 4 , the cooling target liquid cooler 27 may be configured by directly arranging the heat medium flow line L2 inside the cooling target liquid tank 22 . In this case, in the tank 22 of the liquid to be cooled, the piping constituting the liquid cooler to be cooled 27 meanders or turns. As a result, it is possible to increase the contact area between the pipes constituting the cooling target liquid cooler 27 and the cooling target liquid, thereby improving the cooling efficiency.

Further, as shown in FIG. 5, the cooling target liquid cooler 27 may have a configuration in which the cooling target liquid in the cooling target liquid tank 22 does not come into direct contact with the heat medium distribution line L2 through which the heat medium passes. In this case, the liquid cooler 27 to be cooled includes a cooler 51, a heat exchange section 52, a pump 53, lines L41 and L42, and a temperature control valve . The cooler 51 exchanges heat between the heat medium flowing through the heat medium flow line L2 and the intermediate medium circulating through the line L41 to cool the intermediate medium. The line L<b>41 is a line through which the intermediate medium flows, and the intermediate medium flows between the cooler 51 and the heat exchange section 52 . The heat exchanging part 52 is provided in the liquid to be cooled tank 22 and exchanges heat between the intermediate medium and the liquid to be cooled to cool the liquid to be cooled. Pump 53 circulates the intermediate medium in line L41. The line L42 branches off from the line L41 at the temperature control valve 54, bypasses the cooler 51, and joins the line L41 at the junction P2. In this case, the control unit 50 adjusts the flow rate of the intermediate medium supplied to the cooler 51 by controlling the temperature control valve 54 based on the detection result of the temperature sensor 61 provided in the liquid tank 22 to be cooled. . This makes it possible to control the cooling capacity of the liquid cooler 27 to be cooled.

Next, functions and effects of the cooling system 100 according to the present embodiment will be described.

The cooling system 100 according to the present embodiment includes a liquefied gas fuel tank 21 that stores liquefied gas fuel, a liquefied gas fuel heater 24 that heats the liquefied gas fuel using a heat medium, and heat to the liquefied gas fuel heater 24. and a heat medium supply system 32 that supplies the medium. Since the liquefied gas fuel has a low temperature, the heat medium is cooled by heating the liquefied gas fuel with the liquefied gas fuel heater 24 . On the other hand, the cooling system 100 includes a cooling target liquid cooler 27 that is provided in the heating medium supply system and uses the heating medium whose temperature has been lowered by the liquefied gas fuel heater 24 to cool the cooling target liquid. As a result, the cooling target liquid cooler 27 can effectively utilize the cooling capacity of the heat medium that has reached a low temperature in the liquefied gas fuel heater 24 to cool the cooling target liquid. The liquefied gas fuel heater 24 and the heat medium supply system 32 are already installed in the ship 1 having the liquefied gas fuel tank 21 . That is, the cooling system 100 can cool the liquid to be cooled using an existing structure without using a cooling-dedicated device such as a chiller. As described above, deterioration of the liquid to be cooled in the liquid tank to be cooled can be suppressed without using a device dedicated to cooling such as a chiller.

The cooling system 100 according to the present embodiment further includes a heat medium heater 26 that is provided in the heat medium supply system 32 and heats the heat medium whose temperature has been lowered by the liquefied gas fuel heater 24 . In this case, the heat medium heater 26 can heat the low-temperature heat medium after the liquefied gas fuel is heated by the liquefied gas fuel heater 24, and return it to the original temperature.

In the cooling system 100 according to the present embodiment, in the heat medium supply system 32, the cooling target liquid cooler 27 and the heat medium heater 26 are provided in the order of the cooling target liquid cooler 27 and the heat medium heater 26 with respect to the flow of the heat medium. be done. In this case, the liquid cooler 27 to be cooled is supplied with the heat medium in the stage prior to being heated by the heat medium heater 26 . Therefore, the cooling capacity of the liquid cooler 27 to be cooled can be improved.

The invention is not limited to the embodiments described above.

For example, as a cooling system according to a modified example, as shown in FIG. A liquid cooler 27 may be provided in sequence. In this case, the temperature of the heat medium can be raised by the heat medium heater 26 before the heat medium is supplied to the liquid cooler 27 to be cooled. Therefore, it is possible to reduce the cooling capacity of the liquid cooler 27 to be cooled and prevent overcooling. That is, it is possible to prevent the cooling target liquid from being excessively cooled by the heat medium in the cooling target liquid cooler 27 .

As a cooling system according to a modified example, in FIG. 7, the liquid cooler 27 to be cooled and the heat medium heater 26 may be provided in parallel in the heat medium flow line L2 of the heat medium supply system 32 . In this case, the heat medium flow line L2 includes lines L31, L32, and L35 and the temperature control valve 43. A line L32 and a line L35 are branched from the line L31 by the temperature control valve 43 . Line L32 passes through heat medium heater 26 . The line L35 passes through the liquid cooler 27 to be cooled and joins the line L32 at the junction P3. In this case, the control unit 50 can easily adjust the cooling capacity and heating capacity of each part only by adjusting the flow rate of the heat medium to the liquid cooler 27 to be cooled and the heat medium heater 26 . That is, since the branched heat medium exchanges heat with only one of the liquid cooler 27 to be cooled and the heat medium heater 26, it is not necessary to consider temperature changes due to heat exchange with the other.

The arrangement of each component of the cooling system 100 in the ship 1 is not limited to the arrangement shown in FIG. For example, the position of the liquefied gas fuel tank 21 on the deck 19 may be changed and may be located within the hull 11 . Alternatively, the heat medium tank 23 may be provided in the engine room 4 . Liquefied gas fuel heaters 24 may also be provided on deck 19 .

DESCRIPTION OF SYMBOLS 1... Ship, 21... Liquefied gas fuel tank, 22... Liquid tank to be cooled, 24... Liquefied gas fuel heater (heating part), 26... Heat medium heater (heat medium heating part), 27... Liquid cooler to be cooled (cooling part), 32... Heat medium supply system, 100... Cooling system.

Claims (5)

A cooling system for cooling a liquid to be cooled that requires cooling on a ship,
a liquid-to-be-cooled tank that stores the liquid to be cooled;
a liquefied gas fuel tank for storing liquefied gas fuel;
a heating unit that heats the liquefied gas fuel using a heat medium;
a heat medium supply system that supplies the heat medium to the heating unit;
a cooling unit that is provided in the heat medium supply system and cools the liquid to be cooled using the heat medium whose temperature has been lowered by the heating unit. 2. The cooling system according to claim 1, further comprising a heat medium heating unit provided in said heat medium supply system and heating said heat medium whose temperature has been lowered by said heating unit. 3. The cooling system according to claim 2, wherein in said heat medium supply system, said cooling section and said heat medium heating section are provided in the order of said cooling section and said heat medium heating section with respect to the flow of said heat medium. 3. The cooling system according to claim 2, wherein in said heat medium supply system, said cooling section and said heat medium heating section are provided in the order of said heat medium heating section and said cooling section with respect to the flow of said heat medium. 3. The cooling system according to claim 2, wherein in said heat medium supply system, said cooling section and said heat medium heating section are provided in parallel.

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