KR20220145246A - Ess cooling system for ship using cold air from cofferdam - Google Patents

Abstract

Embodiments relate to an energy storage system (ESS) cooling system for a ship using cold air of a cofferdam. The ESS cooling system for a ship using cold air of a cofferdam comprises: an ESS including batteries for supplying power to an onboard power system; a cofferdam installed around a cargo space to prevent fluid intrusion; a first circulation pipe for delivering an internal gas of the cofferdam having a relatively low temperature to the ESS; and a second circulation pipe for delivering an internal gas of the ESS having a relatively high temperature to the cofferdam.

Description

ESS cooling system for ships using cold air from Cofferdam {ESS COOLING SYSTEM FOR SHIP USING COLD AIR FROM COFFERDAM}

Embodiments of the present application relate to a technology for cooling a marine ESS, and more particularly, to a battery cooling system for cooling a marine ESS using the cold air of a cofferdam.

Recently, attempts to manufacture eco-friendly ships using electric energy instead of fossil energy are increasing. However, unlike other mobility such as electric vehicles, the technology for electric energy-based ships in the marine field still has many limitations.

The electric vehicle that is currently equipped with an electric propulsion system and battery is land mobility such as an electric vehicle. However, unlike electric vehicles, MWH-class large-capacity batteries are required for the implementation of the electric propulsion system and battery loading of ships. Existing ESS (Energy storage system) for land mobility has a capacity of 150kWH or less. On the other hand, marine ESS has a large-capacity battery of MWH class. In the case of medium and large ships, even if a battery hybrid system with a relatively reduced ESS capacity is applied, this is because their load is too large. And in the case of small ships, the conversion to electric propulsion ships that operate only with the power stored in the ESS is active.

In addition, in addition to the large-capacity problem, for the implementation of the electric propulsion system and the battery loading of the ship, it is required that continuous operation is possible even when a problem such as a failure occurs in a part of the battery. It is important for ships to secure a stable power supply during the planning time. This is because it is difficult to secure an alternative power source when a problem occurs in the power supply. If a large-capacity battery is dropped due to a problem occurring on a ship battery, a problem arises in the ship's power supply, which may eventually lead to a blackout of the ship's power system. This may cause enormous property and economic losses associated with the vessel.

Despite these battery capacity problems and stability problems, interest in trying to solve them is increasing in the marine field.

In a battery temperature control system used in a conventional marine battery system, a large-capacity cooler is required to cool the air or water supplied to the battery module. The ESS cooler that cools the medium (water or air) for cooling the ESS battery consumes a lot of power and has a limitation in its volume.

Patent Publication No. 10-2017-0092789 (2017.08.14.)

According to the embodiments of the present application, for LNGC, LNG FSRU, LNG fuel propulsion ship, or other liquefied gas carrier having a cryogenic tank, the cold air of the cofferdam existing between each cargo tank is utilized for the ESS cooler. It is intended to provide an ESS cooling system for ships that reduces power consumption and volume (or size).

An ESS cooling system for ships using the cold air of a cofferdam according to an aspect of the present application includes: an ESS (Energy Storage System) including a battery for supplying power to an onboard power system; a cofferdam installed around the cargo space to prevent the ingress of fluid; a first circulation pipe for transferring the internal gas of the cofferdam having a relatively low temperature to the ESS; and a second circulation pipe for transferring the internal gas of the ESS having a relatively high temperature to the cofferdam.

In one embodiment, the ESS cooling system comprises: a first control valve; It may further include; at least one of a blower, and a second control valve. The first control valve is disposed on the gas path of the first circulation pipe. The second control valve is disposed on the gas path of the second circulation pipe. The blower is disposed on the gas path of the first circulation pipe or the second circulation pipe.

In one embodiment, the ESS cooling system includes: the first control valve to control the flow amount of gas; It may further include a control unit for controlling at least one of the blower and the second control valve. The control unit monitors the current temperature of the ESS and the current temperature of the cofferdam, determines whether the temperature of the ESS is equal to or greater than the ESS minimum temperature standard (T_ _ess,min ), and the temperature of the cofferdam is the cofferdam maximum temperature standard (T_ _{coff, max} ) or less, and if the temperature of the ESS is higher than or equal to the ESS minimum temperature standard (T_ _{ess, min} ) and the temperature of the cofferdam is less than or equal to the cofferdam maximum temperature standard (T_ _{coff, max} ), the the first control valve to transfer the cold air of the cofferdam to the ESS and transfer the heat of the ESS to the cofferdam; configured to control at least one of the blower and the second control valve.

In one embodiment, the ESS cooling system includes: an ESS cooler for cooling the gas inside the ESS room; It may further include a; cofferdam heater for heating the internal gas of the cofferdam. The control unit is further configured to control the temperature control operation of each of the ESS cooler and the cofferdam heater.

In an embodiment, the ESS cooler may be set to drive based on a cooler on/off temperature reference. Here, the cooler off temperature standard (T _{_cooler off} ) is a value set to stop the ESS cooler when the temperature of the ESS is less than the cooler off temperature standard (T _{_cooler off} ), and a temperature value exceeding the ESS minimum temperature standard (T _{_ess,min} ) , and the cooler on temperature standard (T _{_cooler on} ) is a value set to start the ESS cooler when the real-time temperature of the ESS exceeds the cooler on temperature standard (T _{_cooler on} ), and the cooler off temperature standard (T _{_cooler off} ) has a temperature value that exceeds

In one embodiment, the cofferdam heater may be configured to operate based on a heating on/off temperature reference. Here, the heating off temperature reference (T _{_heater off} ) is a value set to stop heating the cofferdam when the temperature of the cofferdam exceeds the heating off temperature reference (T _{_heater off} ), and the maximum temperature of the cofferdam (T _{_coff,max} ) has a temperature value of less than, and the heating on temperature reference (T _{_heater on} ) is a value set so that the cofferdam heating starts driving when the temperature of the cofferdam is less than the heating on temperature reference (T _{_heater on} ), and the heating off temperature reference (T _{_heater off} ) has a temperature value less than.

In an embodiment, the controller may block at least one of the gas paths on the first circulation pipe and the second circulation pipe when detecting the occurrence of an emergency situation in the ship.

In one embodiment, the ship to which the ESS cooling system for ships is applied may be a ship including a cofferdam and an ESS. For example, the vessel may be any one of an LNGC, an LNG FSRU, and an LNG fuel propulsion vessel.

The ESS cooling system for ships according to the embodiments of the present application can reduce energy required to drive the ESS cooler and the like by using cold air in Cofferdam for ESS cooling. Furthermore, it is possible to install an ESS cooler having a small power consumption and volume (or size) in a ship to which the ESS cooling system for ships is applied, thereby increasing space efficiency.

The effects of the present invention are not limited to the above-mentioned effects, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

In order to more clearly explain the technical solutions of the embodiments of the present invention or the prior art, drawings necessary for the description of the embodiments are briefly introduced below. It should be understood that the following drawings are for the purpose of explaining the embodiments of the present specification and not for the purpose of limitation. In addition, some elements to which various modifications such as exaggeration and omission have been applied may be shown in the drawings below for clarity of description.
1 is a schematic diagram of an ESS cooling system for ships using cold air of a cofferdam, according to an embodiment of the present application.
2 is a flowchart of a method for cooling an ESS for a ship using the cold air of a cofferdam, according to an embodiment of the present application.

The terminology used herein is for the purpose of referring to specific embodiments only, and is not intended to limit the invention. As used herein, the singular forms also include the plural forms unless the phrases clearly indicate the opposite. As used herein, the meaning of "comprising" specifies a particular characteristic, region, integer, step, operation, element and/or component, and the presence or absence of another characteristic, region, integer, step, operation, element and/or component. It does not exclude additions.

A system according to embodiments may be entirely hardware, entirely software, or may have aspects that are partly hardware and partly software. For example, the system may collectively refer to hardware equipped with data processing capability and operating software for driving the same. As used herein, terms such as “unit,” “module,” “device,” or “system” are intended to refer to a combination of hardware and software run by the hardware. For example, the hardware may be a data processing device including a central processing unit (CPU), a graphic processing unit (GPU), or another processor. In addition, software may refer to a running process, an object, an executable file, a thread of execution, a program, and the like.

Hereinafter, embodiments of the present application will be described in more detail with reference to the drawings.

1 is a schematic diagram of an ESS cooling system for ships using cold air of a cofferdam, according to an embodiment of the present application.

Referring to FIG. 1 , the marine ESS cooling system 1 includes: an ESS 10 ; cofferdam 20; control unit 30; circulation piping (41, 51); blower 43; and control valves 47 and 57 for regulating or opening/blocking the flow rate.

The ESS 10 is a storage that stores energy in the form of power. The ESS 10 includes a plurality of battery racks. Each battery pack includes a plurality of battery modules; and a rack controller. Each battery module is implemented as a battery cell assembly in which a plurality of battery cells are placed in a frame. The battery module is formed by packing a plurality of battery cells. The battery cell is a battery capable of charging and discharging electrical energy, and may be, for example, a lithium ion battery, but is not limited thereto.

The rack controller manages the overall operation of the battery pack to be controlled. The rack controller may include, for example, a Battery Management System (BMS), a battery system, and the like.

The rack controller checks the state of the corresponding battery pack and generates battery-related information. In addition, the rack controller controls the discharge power (ie, output power) based on the confirmed state of the ESS (10). The state of the ESS 10 includes a State of Charge (SoC), a State of Health (SoH), and/or a State of Function (SoF).

The ESS 10 operates to supply power to the onboard load. Power from the plurality of battery packs is supplied to the onboard power system. The ESS 10 may include various facilities for implementing the ESS 10 . The various facilities may be used to match the power characteristics of the ESS 10 and the onboard power system. The various facilities may include, for example, a power conversion system (PCS), a transformer, an energy management system (EMS), a panel, and the like.

The ESS 10 includes an ESS cooler 11 . The ESS cooler 11 is driven so that the temperature of the ESS 10 is maintained at an appropriate temperature. The ESS cooler 11 may include a refrigerant compressor and a cooling fan.

For example, the ESS cooler 11 cools the ESS 10 to suppress an increase in the temperature of the ESS 10 .

In the ESS room (or battery module), heat is generated from the battery itself or other devices in the ESS 10 when the battery is used as for charging and discharging. For example, while the ESS 10 supplies power to the onboard load, heat is generated around the battery and/or power connection path. If the temperature of the ESS 10 (eg, the internal temperature of the ESS room) is high, the components of the ESS 10 are damaged, resulting in a problem in that charging power cannot be stably supplied to the onboard power system. To prevent this, the ESS cooler 11 may cool the ESS 10 to maintain the temperature of the ESS 10 at an appropriate temperature at which system damage will not occur.

In addition, the ESS cooler 11 is configured not to cause a new problem by cooling the ESS 10 more than necessary to prevent overheating. For example, a battery mainly used in the ESS 10 is a lithium ion battery. Such a lithium-ion battery has a characteristic that its performance deteriorates at a low temperature.

In order to prevent this, the marine ESS cooling system 1 may be configured to stop cooling of the ESS 10 when the temperature of the ESS 10 is less than the temperature at which the battery performance rapidly deteriorates.

In certain embodiments, the ESS cooler 11 may be configured to drive for cooling of the ESS 10 when the real-time temperature (or monitoring temperature) of the ESS 10 exceeds the 1-1 specific temperature. . The 1-1 specific temperature may be preset as a cooler-on temperature reference (T _{_cooler_ON} ) at which the ESS cooler 11 starts driving. In addition, the ESS cooler 11 may be configured to stop in order to prevent excessive cooling of the ESS 10 when the real-time temperature (or monitoring temperature) of the ESS 10 is less than the 1-2 specific temperature. The 1-2 specific temperature may be preset as a cooler off temperature reference (T _{_cooler_OFF} ) at which the ESS cooler 11 stops driving.

The cofferdam 20 is a buffer space installed between the bulkheads to prevent a fluid such as oil, water, gas, etc. from directly entering the other compartment from one compartment. The cofferdam 20 is installed around the cargo space to protect the cargo being loaded onto the ship.

The ship ESS cooling system (1) is installed around the cargo space and is applied to a ship in which the cofferdam 20 must be maintained at a temperature higher than the temperature of the cargo space. For example, the ESS cooling system 1 for ships of FIG. 1 may be applied to Liquefied Natural Gas Carriers (LNGC), LNG FSRUs, LNG fuel propulsion ships, or other liquefied gas carriers with cryogenic tanks.

Also, the cofferdam 20 includes a cofferdam heater 21 .

In these ships, the temperature of the cargo space is kept low to keep the cargo being loaded at a low temperature. In particular, each cargo tank (Cargo Tank) in the above-described fuel propulsion ship or liquefied gas ship, for example, is maintained at a very low temperature of less than 0 ℃. Then, when a cofferdam exists between or around the low temperature or cryogenic cargo space, it is placed under the influence of the low temperature or cryogenic temperature of the cargo space.

A cofferdam installed in ships such as LNG carriers and FSRUs is a hull material and is generally not made of materials resistant to cryogenic temperatures such as cryogenic steel. Therefore, when a cofferdam is installed directly around a cargo space having a very low temperature, such as formed as a space between cryogenic tanks, the cofferdam 20 is directly exposed to a very low temperature of the surrounding cargo space. Then, it also has a low temperature, so that the cofferdam inevitably has structural damage due to the temperature drop.

It is common that the cofferdam 20 is not made of a material for a cryogenic temperature wall. Therefore, the cofferdam heater 21 is configured to heat the cofferdam 20 to maintain the temperature of the cofferdam 20 at an appropriate level. The cofferdam heater 21 heats the cofferdam 20 to suppress structural damage.

The marine ESS cooling system 1 has a driving characteristic in which the temperature of the cofferdam 20 must be maintained at a set temperature (eg, approximately 5° C.) using the cofferdam heater 21 .

In addition, even if the cofferdam heater 21 maintains the temperature of the cofferdam 20 above the set temperature, if the cofferdam 20 is heated more than necessary, the temperature of the surrounding cargo space is raised more than necessary, thereby causing a new problem. Control the temperature of the cofferdam 20 so as not to For example, if the cofferdam heater 21 heats the cofferdam 20 more than necessary, the vaporization amount of the liquefied gas in the cargo tank may increase more than necessary, which may cause a loss of cargo.

In order to prevent this, the ESS cooling system 1 for ships may be configured to stop heating the cofferdam 20 when the temperature of the cofferdam 20 exceeds a temperature causing a loss of cargo.

In certain embodiments, the cofferdam heater 21 may be configured to drive for heating of the cofferdam 20 when the real-time temperature (or monitoring temperature) of the cofferdam 20 exceeds the second-first specific temperature. may be The 2-1 specific temperature may be preset as a heating-on temperature reference (T _{_heater_ON} ) at which the cofferdam heater 21 starts driving. In addition, the cofferdam heater 21 may be configured to stop to prevent excessive heating of the cofferdam 20 when the real-time temperature (or monitoring temperature) of the cofferdam 20 is less than the 2-2 specific temperature. . The 2-2 specific temperature may be preset as a heating-off temperature reference (T _{_heater_OFF} ) at which the cofferdam heater 21 stops driving.

In one embodiment, the ESS cooler 11 and the cofferdam heater 21 may be configured to have power capacity capable of independently maintaining each space at a target temperature.

The cofferdam heater 21 may be stopped in operation depending on the operating environment and time zone. This is because the difference in heat duty required for the cofferdam 20 of the LNG carrier or the like is large depending on the temperature of the outside air and seawater. In the corresponding operating environment and time zone, the temperature of the cofferdam 20 may be maintained even if the cofferdam heater 21 is not driven. For example, the marine ESS cooling system 1 can maintain the temperature of the cofferdam 20 at a set temperature (eg, approximately 5° C.) even without driving the cofferdam heater 21 in a tropical region. That is, when driving is unnecessary, the cofferdam heater 21 is not driven.

Similarly, the operation of the ESS cooler 11 may be stopped depending on the use environment and the like. This is because the cooling duty varies depending on the load and external temperature during charging/discharging, and the ESS 10 may not always be charged and discharged.

In addition, as described above, in order to prevent deterioration of the battery performance of the ESS 10 , the ESS cooler 11 stops driving when the temperature of the ESS 10 drops too much to bring the temperature of the ESS 10 to an appropriate temperature range. may raise it.

In addition, when charging and discharging at 3C-rate in 1MWh class ESS, cooling of the battery module is required, but in case of charging and discharging at 1C-rate, cooling may not be necessary. When driving is unnecessary, the ESS cooler 11 is not driven.

As such, the fluctuations in the required power and load for cooling of the ESS 10 and heating of the cofferdam 20 are large, and the timing when cooling of the ESS 10 and heating of the cofferdam 20 may not coincide. Therefore, it is more advantageous that the cooler 11 and the cofferdam heater 21 of the capacity capable of independently maintaining each space at the target temperature without air circulation between the two spaces are installed. The temperature maintenance operation of the ESS cooler 11 and the temperature maintenance operation of the cofferdam heater 21 may be performed independently.

In addition, in certain embodiments, the marine ESS cooling system 1 is based on the ESS minimum temperature reference (T_ _ess,min ) and the cofferdam maximum temperature reference (T_ _coff,max ) based on the ESS cooler 11 and the cofferdam The heater 21 may be driven. The marine ESS cooling system 1 performs a cooling operation to maintain the temperature (T _{_ess} ) of the ESS 10 in the driving target temperature range (T _{_ess,min} ≤ T _{_ess} ≤ T _{_cooler on} ) of the ESS cooler 11 . It may be configured to perform In addition, the ESS cooling system for ships 1 maintains the real-time temperature (T _{_coff} ) of the cofferdam 20 in the driving target temperature range of the cofferdam heater 21 (T _{_heater on} ≤ T _{_coff} ≤ T _{_coff,max} ) It may be configured to perform a heating operation. This will be described in more detail with reference to FIG. 2 below.

The marine ESS cooling system 1 consumes fuel to maintain the temperature of the ESS 10 (eg, by the ESS cooler 11 ) at an appropriate temperature so as not to cause an interruption in the power supply. In addition, the marine ESS cooling system 1 consumes fuel to maintain the temperature of the cofferdam 20 (eg, by the cofferdam heater 21 ) at a specific temperature so as not to cause damage to the wall surface.

The marine ESS cooling system (1) of the present application is configured to consume less energy than the total energy consumption of the above two consumers independently by linking the hot air demander requiring heating and the cooling heater demanding destination requiring cooling, It is configured to have higher energy efficiency.

To this end, the marine ESS cooling system 1 of FIG. 1 cools the internal gas of the ESS 10 to minimize fuel consumption to prevent overheating of the battery temperature. have a structure Here, the cold air of the cofferdam 20 is not limited to a gas having a temperature that a person can actually feel as a cold gas, but refers to a gas having a temperature lower than the internal temperature of the ESS 10 . The cold air of the cofferdam 20 is distributed inside the cofferdam 20, has a lower temperature than the temperature of the ESS 10, and when injected into the ESS 10, the thermal energy of the ESS 10 is received and the ESS 10 ) contains gases that can lower the temperature.

In addition, the marine ESS cooling system 1 of FIG. 1 heats the internal gas of the cofferdam 20 to minimize fuel consumption to prevent the temperature drop of the cofferdam 20, It has a structure that transmits heat. Here, the heat of the ESS 10 is not limited to a gas having a temperature that a person can actually feel as a hot gas, but refers to a gas having a temperature higher than the internal temperature of the cofferdam 20 .

The marine ESS cooling system 1 may have a circulation structure in which cold air of the cofferdam is injected into the ESS 10 and air heated in the ESS room is re-injected into the cofferdam 20 .

The transfer of the cold air of the cofferdam 20 to the ESS 10 includes injecting the cold air of the cofferdam 20 into the ESS room in which the ESS 10 is installed, the frame in which the battery is packed, and/or the battery cooling passage. do.

The transfer of the heat of the ESS 10 to the cofferdam 20 includes injecting the heat of the ESS 10 into the inner space of the cofferdam 20 and/or the cofferdam heating passage through one side bulkhead. .

circulation piping (41, 51); blower 43; and control valves 47 and 57 form a hot/cold heat transfer path in the marine ESS cooling system 1 . In the present specification, among the components forming the circulation structure, the component disposed on the path from the cofferdam 20 to the ESS 10 is the first component, on the path from the ESS 10 to the cofferdam 20 . A component disposed on may be referred to as a second component.

The circulation pipes 41 and 51 are connected between the ESS 10 and the cofferdam 20 to circulate the internal gas of each space. At least some of the circulation pipes 41 and 51 may include an air duct.

The circulation pipe 41 provides a gas path for transferring the internal gas of the cofferdam 20 to the ESS 10 . One end of the circulation pipe 41 is connected to the cofferdam 20 and the other end is connected to the ESS 10 . For example, one end of the circulation pipe 41 may be connected to one side bulkhead of the cofferdam 20 and the other end of the circulation pipe 41 may be connected to the ESS room.

As described above, the cofferdam 20 is lower than the holding temperature of the ESS 10 even if it is heated by the cofferdam heater 21 . The gas inside the cofferdam 20 having such a relatively low temperature moves to the ESS 10 along the circulation pipe 41 .

The circulation pipe 51 provides a gas path for transferring the internal gas of the ESS 10 to the cofferdam 20 . One end of the circulation pipe 51 is connected to the ESS room or battery cooling passage in which the ESS 10 is installed, and the other end of the circulation pipe 51 is connected to the other bulkhead or heating passage of the cofferdam 20 .

As described above, even if the ESS 10 is cooled by the ESS cooler 11 , it is higher than the maintenance temperature of the cofferdam 20 by the cofferdam heater 21 . The internal gas of the ESS 10 having such a relatively high temperature moves to the cofferdam 20 along the circulation pipe 51 .

The blower 43 generates/blocks the flow of gas or increases/decreases the amount of gas flow.

In one embodiment, the blower 43 is installed on the gas path of the circulation pipe 41 . The blower 43 circulates the cold air of the cofferdam 20 along the circulation pipe 41 . However, the installation position of the blower 43 is not limited on the gas path of the circulation pipe 41 . In other embodiments, the blower 43 may be installed on the gas path of the circulation pipe 51 . Then, the blower 43 circulates the hot air of the ESS 10 along the circulation pipe 51 .

The control valves 47 and 57 are configured to open/block the gas flow to separate the ESS room and the cofferdam 20 . In addition, the control valves 47 and 57 may be further configured to increase/decrease the gas flow amount to adjust the gas flow amount between the ESS room and the cofferdam 20 . In certain embodiments, the control valves 47 , 57 may include valves and actuators.

Control valves (47, 57) are disposed on the gas path of each circulation pipe (41, 51). For example, as shown in FIG. 1 , the control valve 47 may be disposed on the gas path of the circulation pipe 41 to open or block the gas circulation path from the cofferdam 20 to the ESS 10 . . The control valve 57 may be disposed on the gas path of the circulation pipe 51 to open or block the gas circulation path from the ESS 10 to the cofferdam 20 .

The operation of the blower 43 and the control valves 47 and 57 may be controlled by the control unit 30 .

The control unit 30 includes at least one processor, and the marine ESS cooling system 1 performs a method of cooling the ESS 10 using the cold air of the cofferdam 20 . For example, the controller 30 controls a circulation control operation of transferring heated air generated in the ESS 10 to the cofferdam 20 and supplying cool air from the cofferdam 20 to the ESS 10 . To this end, the marine ESS cooling system 1 further includes one or more temperature sensors (not shown) for detecting the temperature state of the ESS 10 and the cofferdam 20 . The controller 30 may monitor the temperatures of the ESS 10 and the cofferdam 20 using a temperature sensor.

In one embodiment, the marine ESS cooling system 1 may preset the values of the ESS minimum temperature reference (T_ _ess,min ) and the cofferdam maximum temperature reference (T_ _coff,max ).

The controller 30 controls the circulation components 43 and 47 to transfer the cold air of the cofferdam 20 to the ESS 10 when the temperature of the ESS 10 is equal to or higher than the ESS minimum temperature standard (T_ _ess,min ). . The control unit 30 controls the circulation component 57 to transfer the heat of the ESS 10 to the cofferdam 20 when the temperature of the cofferdam 20 is below the cofferdam maximum temperature reference (T_ _{coff, max} ). . The control unit 30 may generate a control command for controlling at least one of the control valves 47 and 57 , the ESS cooler 11 , and the cofferdam heater 21 and transmit it to the corresponding component. The control command may include whether to turn on/off the driving for initiating the gas circulation operation, and a driving value for a target flow amount of gas.

2 is a flowchart of a method for cooling an ESS for a ship using the cold air of a cofferdam, according to an embodiment of the present application.

The ESS cooling method for ships using the cold air of the cofferdam 20 of FIG. 2 (hereinafter, "ship ESS cooling method") is performed by the ESS cooling system 1 for ships of FIG. 1 .

Referring to FIG. 2 , the method for cooling the ESS for ships includes: monitoring the temperature of the ESS 10 and the temperature of the cofferdam 20 by the controller 30 ( S100 ).

The temperature of the ESS 10 in step S100 may be based on one or more of the internal temperature of the ESS room in which the ESS 10 is installed, the internal or ambient temperature of the frame in which the battery is packed, and a combination thereof. For example, the internal temperature of the ESS room may be monitored.

The ship ESS cooling method includes: transferring cold air from the cofferdam 20 to the ESS 10 and transferring the heat from the ESS 10 to the cofferdam 20 ( S300 ).

In one embodiment, the step (S300) is: determining whether the temperature of the ESS 10 by the control unit 30 is equal to or greater than the ESS minimum temperature reference (T_ _ess,min ), and the temperature of the cofferdam 20 is copper It includes a step (S310) of determining whether the dam maximum temperature standard (T_ _{coff, max} ) or less. The ESS minimum temperature standard (T_ _ess,min ) and the cofferdam maximum temperature standard (T_ _coff,max ) have been described above, so detailed descriptions will be omitted.

In addition, the step (S300) is when the temperature of the ESS 10 is higher than the ESS minimum temperature standard (T_ _ess,min ) and less than the cofferdam maximum temperature standard (T_coff _,max ) (that is, the temperature condition of step S310) is satisfied) the control valves 47 and 57 by the control unit 30 to transfer the cold air of the cofferdam 20 to the ESS 10 and the heat from the ESS 10 to the cofferdam 20. and opening (S330).

In one embodiment, the step (S330) includes driving the blower (43). When the control valve 47 is opened by the control unit 30 and the blower 43 is driven, the internal gas of the cofferdam 20 moves to the ESS 10 along the circulation pipe 41 ( S310 ). Since the internal gas (T_ _coff ) of the cofferdam 20 below the cofferdam maximum temperature standard (T_ _coff,max ) is cold air having a temperature lower than the internal temperature of the ESS 10, the temperature increase rate of the ESS 10 or the ESS The temperature of (10) may be lower than before the cold air injection of the cofferdam (20). Then, the marine ESS cooling system 1 can reduce the fuel used to cool the ESS 10 so that the temperature of the ESS 10 maintains an appropriate temperature. Whether the cofferdam 20 has such cold air has been described above, and a detailed description thereof will be omitted.

In addition, when the control valve 57 is opened by the control unit 30 and the blower 43 is driven, the internal gas of the ESS 10 moves to the cofferdam 20 along the circulation pipe 51 (S310) . Since the temperature (T_ _ess ) of the ESS 10 that is higher than the ESS minimum temperature standard (T_ _ess,min ) is hot air having a temperature higher than the internal temperature of the cofferdam 20, the temperature drop rate of the cofferdam 20 or the cofferdam The temperature of ( 20 ) may be higher than before the hot air injection of the ESS ( 10 ). Whether the ESS 10 has such heat has been described above, and a detailed description thereof will be omitted.

Through this transfer of hot/cold air, the internal gas moves to the cofferdam 20 along the circulation pipe 51, and the cold air injected from the cofferdam 20 acquires thermal energy of the battery and is heated again, and the heated gas A circulation structure in which is re-injected into the cofferdam 20 is formed (S310). Under the circulation structure, the internal gas of the cofferdam 20 and the internal gas of the ESS 10 (eg, the internal gas of the ESS room) are directly exchanged, and eventually, the heat of the ESS 10 for heating the cofferdam 20 . is discharged and the cold air of the cofferdam 20 is recovered from each other for cooling of the ESS 10 .

In some embodiments, the control unit 30 controls the degree of opening of the control valve 47 and/or the degree of driving of the blower 43 to adjust the flow amount of gas flowing from the cofferdam 20 to the ESS 10 . You may.

In addition, the step (S300) is: If the monitoring result of the step (S100) does not satisfy the temperature condition of the step (S310), the cold air of the cofferdam 20 is not transferred to the ESS (10) and the heat of the ESS (10) to block the control valves 47 and 57 by the control unit 30 (S350) so as not to transmit the to the cofferdam 20.

Energy when the temperature (T _{_ess} ) of the ESS 10 is less than the ESS minimum temperature standard (T _{_ess,min} ) or the temperature (T _{_coff} ) of the cofferdam 20 exceeds the cofferdam maximum temperature standard (T _{_coff,max} ) By stopping the exchange, the fuel consumption of the system 1 is minimized (S350).

In one embodiment, the step (S350) includes the step of stopping the blower (43). If the energy exchange between the ESS 10 and the cofferdam 20 is not made after the step S100, the control unit 30 controls the control valves 47 and 57 and/or the blower 43 to block the circulation path. may be maintained.

In addition, the ship ESS cooling method may further include: blocking at least one of the gas paths on the first circulation pipe and the second circulation pipe when detecting the occurrence of an emergency situation in the ship ( S20 ). In step S200, the transfer of hot and/or cold air between the ESS 10 and the cofferdam 20 is stopped.

Here, the emergency situation in the vessel is a situation in which greater damage may occur to the vessel when the internal gas is propagated along the circulation pipes 41 and 51, and the emergency situation in the ESS 10 and/or the cofferdam 20 including emergency situations in The emergency situation in the ESS 10 may include a battery short circuit, a battery fire, and other ESS thermal runaway situations. The emergency situation in the cofferdam 20 may include leakage of liquefied natural gas (LNG) and natural gas (NG) inside the cofferdam 20 .

The control unit 30 may block the gas path by blocking the control valves 47 and 57 and stopping the blower 43 when detecting the occurrence of an emergency situation (eg, by a temperature sensor) (S200). In the ESS cooling system for ships (1), the operation (S200) of shutting off the control valve and stopping the blower when ESS thermal runaway occurs or when LNG or NG leaks inside the cofferdam is applied in preference to the gas circulation operation for temperature control in step (S300). .

The ship's ESS cooling system 1 heats the cofferdam 20 or consumes separate power to cool the ESS 10. The driving of the cofferdam heater 21 and/or the ESS cooler 11 is minimized. Even in this case, the cofferdam 20 may be heated and the ESS 10 may be cooled by circulating each other's internal gases in step S330 . The marine ESS cooling system 1 does not circulate gas when either heating/cooling of the ESS 10 and the cofferdam 20 is unnecessary. In this case, the marine ESS cooling system 1 may control the space to an appropriate temperature through the ESS cooler 11 or the cofferdam heater 21 .

Due to this circulation structure, the ship ESS cooling system 1 uses the relative cold air of the cofferdam as air for cooling the battery in the ESS room, and the air heated in the ESS room is used as air for heating the cofferdam. This reduces the energy consumed for cooling the battery in the ESS room and the energy for heating the Cofferdam. That is, relatively less fuel is consumed to lower the temperature of the ESS 10 compared to a conventional marine battery system that lowers the temperature of the battery using only the ESS cooler 11 .

In alternative embodiments, the marine ESS cooling system 1 is configured to drive the ESS cooler 11 and/or the cofferdam heater 21 when it is not necessary to circulate each other's internal gases in step S330 . It may be further configured. The marine ESS cooling method performed by the marine ESS cooling system 1 is: Exchanging heat by directly circulating the internal gas of the cofferdam 20 and the internal gas of the ESS 10, and the ESS cooler 11 It may further include control steps in which cooling according to and heating according to the cofferdam heater 21 are linked.

The ship ESS cooling method includes: controlling the ESS cooler 11 based on the monitoring result of step S100 (S110); and controlling the cofferdam heater 21 based on the monitoring result of step S100 (S120). The controller 30 controls the ESS cooler 11 based on the temperature of the ESS 10 and the preset cooler on/off temperature reference. The control unit 30 controls the cofferdam heater 21 based on the temperature of the cofferdam 20 and the preset heating on/off temperature reference.

The control operations of the steps S110, S120, and S300 in the marine ESS cooling system 1 having a circulation structure composed of the circulation pipes 41 and 51 of FIG. 1 may be performed by the controller 30 independently of each other. . To this end, temperature parameters (T _{_ess,min} and T _{_coff,max} ) for the control operation of step S300, temperature parameters (T _{_cooler_ON} , T _{_cooler_OFF} ) for the control operation of step S110, and step S120 The temperature parameters (T _{__heater on} , T _{_heater off} ) for the control operation are respectively set.

In one embodiment, a temperature parameter (T _{_cooler_ON} , T _{_cooler_OFF} ) for driving the ESS cooler 110 in step S110 , a temperature parameter for driving the cofferdam heater 120 in step S120 (T _{__heater on} ) , T _{_heater off} ), and temperature parameters for gas circulation between the ESS 10 and the cofferdam 20 (T _{_ess,min} and T _{_coff,max} ) may be set to satisfy the following upper and lower relationships, respectively: a ) T _{_ess,min} < T _{_cooler off} ≤ T _{_cooler on,} b) T _{_heater on} ≤ T _{_heater off} < T _{_coff,max} .

The step (S110) includes: determining whether the temperature (T _{_ess} ) of the ESS (10) exceeds the cooler-on temperature reference (T _{_cooler_ON} ) (S111); and a step (S113) of driving the ESS cooler 11 when the temperature (T _{_ess} ) of the ESS 10 exceeds the cooler-on temperature reference (T _{_cooler_ON} ).

The cooler on temperature reference (T _{_cooler on} ) is a value set to start the operation of the ESS cooler 11 when the real-time temperature of the ESS 10 exceeds the cooler on temperature reference (T _{_cooler on} ). When the real-time temperature of the ESS 10 exceeds the cooler on temperature reference (T _{_cooler on} ), the power supply performance of the ESS 10 may be deteriorated.

The cooler 11 is driven to lower the temperature of the ESS 10 .

In addition, the step (S110) includes: determining whether the temperature (T _{_ess} ) of the ESS (10) is less than the cooler off temperature reference (T _{_cooler_OFF} ) (S115); and stopping the ESS cooler 11 when the temperature (T _{_ess} ) of the ESS 10 is less than the cooler-off temperature reference (T _{_cooler_OFF} ) ( S117 ).

The cooler off temperature reference (T _{_cooler off} ) is a value set to stop the ESS cooler 11 when the real-time temperature (ie, monitoring temperature) of the ESS 10 is less than the cooler off temperature reference (T _{_cooler off} ). Here, the cooler off temperature reference (T _{_cooler off} ) is a temperature value exceeding the ESS minimum temperature reference (T _{_ess,min} ).

In one embodiment, the step (S110) may be performed before the gas circulation step (S300). Then, the ESS cooler 11 operates to maintain the real-time temperature (T _{_ess} ) of the ESS 10 in the driving target temperature range (T _{_ess,min} < T _{_ess} ≤ T _{_cooler on} ) of the ESS cooler 11 .

For example, when the temperature (T _{_ess} ) of the ESS 10 exceeds the cooler on temperature reference (T _{_cooler on} ), the ESS cooler 11 starts operation. Then, the temperature (T _{_ess} ) of the ESS 10 is lowered. When the temperature (T _{_ess} ) of the ESS 10 falls below the cooler off temperature reference (T _{_cooler off} ), the ESS cooler 11 is stopped. When the ESS cooler 11 is stopped, the temperature of the ESS 10 may be controlled only by the cold of the cofferdam 20 (S300).

The step (S120) includes: determining whether the temperature (T _{_coff} ) of the cofferdam 20 is less than the heating-on temperature reference (T _{_heater_ON} ) (S121); and driving the cofferdam heater 21 when the temperature (T _{_coff} ) of the cofferdam 20 is less than the heating-on temperature reference (T _{_heater_ON} ) ( S123 ).

The heating-on temperature reference (T _{_heater on} ) is when the real-time temperature (ie, monitoring temperature) of the cofferdam 20 is less than or equal to the heating-on temperature reference (T _{_heater on} ), the cofferdam heater 21 is driven to drive the cofferdam 20 This is the value set to heat. If the temperature of the cofferdam 20 is less than the heating-on temperature reference (T _{_heater on} ), the structural durability of the cofferdam 20 may be reduced.

The cofferdam heater 21 is driven to increase the temperature of the cofferdam 20 .

The step (S120) includes: determining whether the temperature (T _{_coff} ) of the cofferdam 20 exceeds the heating-off temperature reference (T _{_heater_OFF} ) (S125); and stopping the cofferdam heater 21 when the temperature (T _{_coff} ) of the cofferdam 20 exceeds the heating-off temperature reference (T _{_heater_OFF} ) ( S127 ).

The heating-off temperature reference (T _{_heater off} ) is a value set to stop the cofferdam heater 21 when the real-time temperature of the cofferdam 20 is equal to or greater than the heating-off temperature reference (T _{_heater off} ). Here, the heating-off temperature reference (T _{_heater off} ) is a temperature value less than or equal to the cofferdam maximum temperature reference (T _{_coff,max} ).

In one embodiment, the step (S120) may be performed before the gas circulation step (S300). Then, the cofferdam heater 21 operates to maintain the real-time temperature (T _{_coff} ) of the cofferdam 20 in the driving target temperature range (T _{_heater on} ≤ T _{_coff} < T _{_coff,max} ) of the cofferdam heater 21 . do.

For example, when the temperature (T _{_coff} ) of the cofferdam 20 falls below the heating-on temperature reference (T _{_heater on} ), the cofferdam heater 21 starts operation. Then, the temperature (T _{_coff} ) of the cofferdam 20 rises. When the temperature (T _{_coff} ) of the cofferdam 20 exceeds the heating-off temperature reference (T _{_heater off} ), the cofferdam heater 21 is stopped. When the cofferdam heater 21 is stopped, the temperature of the cofferdam 20 may be controlled only by the heat of the ESS 10 ( S300 ).

The ship ESS cooling system 1 directly circulates the internal gas of the cofferdam 20 and the internal gas of the ESS 10 to exchange heat, and cooling according to the ESS cooler 11 and the cofferdam heater 21 ) by connecting the heating, it is possible to more efficiently cool the ESS (10). That is, the energy efficiency is further improved under the circulation structure by specifically driving the cooler 11/cofferdam heater 21 as described above.

By utilizing the marine ESS cooling system 1 of FIG. 1 or the marine ESS cooling method of FIG. 2 , the temperature of the ESS 10 can be sufficiently maintained at an appropriate temperature with less power consumption.

It will be apparent to a person skilled in the art that the marine ESS cooling system 1 may include other components not described herein. For example, the marine ESS cooling system 1 may include a network interface, an input device for data entry, and an output device for display, printing or other data presentation, including other hardware components necessary for the operation described herein. may include.

According to the embodiments described above The marine ESS cooling system 1 and the operation by the marine ESS cooling method performed thereby may be at least partially implemented as a computer program and recorded in a computer-readable recording medium. For example, embodied with a program product consisting of a computer-readable medium containing program code, which may be executed by a processor for performing any or all steps, operations, or processes described.

The computer-readable recording medium includes all kinds of recording identification devices in which computer-readable data is stored. Examples of the computer-readable recording medium include ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical data storage identification device, and the like. In addition, the computer-readable recording medium may be distributed in network-connected computer systems, and the computer-readable code may be stored and executed in a distributed manner. In addition, functional programs, codes, and code segments for implementing the present embodiment may be easily understood by those skilled in the art to which the present embodiment belongs.

Although the present invention as described above has been described with reference to the embodiments shown in the drawings, it will be understood that these are merely exemplary, and that various modifications and variations of the embodiments are possible therefrom by those of ordinary skill in the art. However, such modifications should be considered to be within the technical protection scope of the present invention. Accordingly, the true technical protection scope of the present invention should be determined by the technical spirit of the appended claims.

Claims (8)

In the ESS cooling system for ships using the cold air of Cofferdam,
ESS (Energy Storage System) including a battery for supplying power to the onboard power system;
a cofferdam installed around the cargo space to prevent the ingress of fluid;
a first circulation pipe for transferring the internal gas of the cofferdam having a relatively low temperature to the ESS; and
ESS cooling system for ships comprising a; a second circulation pipe for transferring the internal gas of the ESS having a relatively high temperature to the cofferdam.
The method according to claim 1,
a first control valve; At least one of a blower, and a second control valve; further comprising,
the first control valve is disposed on the gas path of the first circulation pipe, and
the second control valve is disposed on the gas path of the second circulation pipe, and
The blower is an ESS cooling system for a ship, characterized in that it is disposed on the gas path of the first circulation pipe or the second circulation pipe.
3. The method according to claim 2,
the first control valve to control the flow amount of gas; Further comprising a control unit for controlling at least one of the blower, and the second control valve,
The control unit is
Monitoring the current temperature of the ESS and the current temperature of the cofferdam,
It is determined whether the temperature of the ESS is higher than the ESS minimum temperature standard (T_ _ess,min ),
It is determined whether the temperature of the cofferdam is less than the cofferdam maximum temperature standard (T_ _{coff, max} ), and
If the temperature of the ESS is higher than the ESS minimum temperature standard (T_ _ess,min ) and the temperature of the cofferdam is less than or equal to the cofferdam maximum temperature standard (T_ _coff,max ), the cold air of the cofferdam is transferred to the ESS and the the first control valve for transferring heat to the cofferdam; ESS cooling system for ships, characterized in that configured to control at least one of the blower and the second control valve.
4. The method of claim 3,
ESS cooler to cool the gas inside the ESS room;
Further comprising; a cofferdam heater for heating the internal gas of the cofferdam,
The control unit ESS cooling system for ships, characterized in that further configured to control the temperature control operation of each of the ESS cooler and the cofferdam heater.
5. The method according to claim 4,
The ESS cooler is set to drive based on the cooler on/off temperature standard,
Here, the cooler off temperature standard (T _{_cooler off} ) is a value set to stop the ESS cooler when the temperature of the ESS is less than the cooler off temperature standard (T _{_cooler off} ), and a temperature value exceeding the ESS minimum temperature standard (T _{_ess,min} ) To have,
The cooler on temperature standard (T _{_cooler on} ) is a value set to start the ESS cooler when the real-time temperature of the ESS exceeds the cooler on temperature standard (T _{_cooler on} ) _. ESS cooling system for ships, characterized in that it has a temperature value.
5. The method according to claim 4,
The cofferdam heater is set to drive based on a heating on/off temperature reference,
Here, the heating off temperature reference (T _{_heater off} ) is a value set to stop heating the cofferdam when the temperature of the cofferdam exceeds the heating off temperature reference (T _{_heater off} ), and the maximum temperature of the cofferdam (T _{_coff,max} ) have a temperature value less than,
The heating on temperature reference (T _{_heater on} ) is a value set to start the cofferdam heating operation when the temperature of the cofferdam is less than the heating on temperature reference (T _{_heater on} ), and a temperature value less than the heating off temperature reference (T _{_heater off} ) ESS cooling system for ships, characterized in that it has a.
The method according to claim 3, wherein the control unit,
ESS cooling system for a ship, characterized in that when detecting the occurrence of an emergency in the ship, at least one of the gas paths on the first circulation pipe and the second circulation pipe is blocked.
The method according to claim 1,
The ship to which the ESS cooling system for ships is applied is a ship including a cofferdam and an ESS, and it is characterized in that it is any one of LNGC (Liquefied Natural Gas Carriers), LNG FSRU (LNG Floating Storage Re-gasification Unit), and LNG fuel propulsion ships. ESS cooling system for ships.

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