Method of Determining Greenhouse Gas Emissions During Small Ships Operation Using Life Cycle Evaluation

Abstract

A target vessel selection step for selecting a small vessel to determine greenhouse gas emissions during planing using a full-cycle assessment; a planing condition derivation step for determining the planing speed, hull shape, and displacement of the small vessel selected in the target vessel selection step and calculating the total drag force of the small vessel based thereon; a combustion condition calculation step for calculating the hourly emission of each greenhouse gas emitted during planing of the small vessel using the total drag force calculated in the planing condition derivation step; a life condition calculation step for calculating the total operating time of the small vessel selected in the target vessel selection step during planing throughout its entire cycle; a full-cycle greenhouse gas emission derivation step for deriving the total emissions of each greenhouse gas during planing of the small vessel over its entire cycle using the total operating time of the small vessel calculated in the life condition calculation step and the hourly emission amount of each greenhouse gas calculated in the combustion condition calculation step; and storing the total greenhouse gas emissions derived in the full-cycle greenhouse gas emission derivation step, the hourly emission of each greenhouse gas calculated in the combustion condition calculation step, and the planing conditions, planing speed, hull shape, and displacement determined in the derivation step in a DB. A method for determining greenhouse gas emissions during small vessel planing using a full-cycle evaluation, comprising a DB storage step, a planing condition change step proceeding from the planing condition derivation step by changing the planing speed input in the planing condition derivation step, and a DB comparison step comparing the total emissions and changes in emissions for each small vessel according to a plurality of planing speeds stored in the DB storage step.

Description

Technology Field

[0001] The present invention relates to a method for determining greenhouse gas emissions during planing of a small vessel using a full-cycle evaluation, and more specifically, to a method for quantitatively calculating greenhouse gas emissions during the full cycle of planing of a small vessel having a carine shape. Background Technology

[0003] Most ships sail using fossil fuels as energy and emit greenhouse gases. Methods for measuring greenhouse gas emissions from ships include predicting emissions through measurement during engine development or utilizing emission measurement devices during ship operation. Greenhouse gas emissions are determined using arithmetic formulas presented by the International Maritime Organization or regression equations presented by research institutions.

[0004] As the International Maritime Organization presents various indicators related to the reduction of greenhouse gas emissions from ships, greenhouse gas emissions are calculated using an arithmetic formula based on fuel consumption, and recently, the ISO 14000 Lifecycle Assessment method, which is used in various industrial sectors, is also being utilized.

[0005] However, the above-mentioned arithmetic formulas or evaluation methods are designed to satisfy specific indicators of the International Maritime Organization, and the scope of application of the calculation results is very limited, posing a problem for their application to small vessels.

[0006] Small vessels under 30 tons registered in Korea account for more than 80% of the total number of vessels, and most of these small vessels have a chine shape that lifts the hull at specific speeds to reduce resistance and increase engine efficiency at the same speed. The aforementioned arithmetic formulas or evaluation methods determine greenhouse gas emissions based on the maximum speed of the vessel, and there is a problem in that it is difficult to quantitatively calculate the impact of reduced resistance on greenhouse gas emissions when a vessel with a chine shape is in a planing state. Furthermore, there is no method to quantitatively calculate the greenhouse gases emitted by the vessel over its entire life cycle by reflecting the actual operating time, making it difficult to determine how much greenhouse gas the vessel actually emits during its life cycle. Prior art literature

[0008] KR 10-1714028BKR 10-2154272B The problem to be solved

[0009] The present invention aims to solve conventional problems and provides a method for determining greenhouse gas emissions during planing throughout the entire lifecycle of a small vessel.

[0010] In addition, the present invention aims to enable a comparison of changes in greenhouse gas emissions according to the planing speed of small vessels.

[0011] In addition, the present invention aims to determine the planing speed at which a small vessel minimizes greenhouse gas emissions.

[0012] In addition, the present invention aims to determine greenhouse gas emissions by reflecting the planing state of a small vessel having a car-shaped profile. means of solving the problem

[0014] To achieve the above objective, a method for determining greenhouse gas emissions during planing of a small vessel using a full-cycle evaluation according to an embodiment of the present invention comprises: a target vessel selection step for selecting a small vessel to determine greenhouse gas emissions during planing using a full-cycle evaluation; a planing condition derivation step for determining the planing speed, hull shape, and displacement of the small vessel selected in the target vessel selection step and calculating the total drag force of the small vessel based thereon; a combustion condition calculation step for calculating the hourly emission amount of each greenhouse gas emitted during planing of the small vessel using the total drag force calculated in the planing condition derivation step; a life condition calculation step for calculating the total operating time of the small vessel selected in the target vessel selection step for planing during the entire cycle; a full-cycle greenhouse gas emission derivation step for deriving the total emission amount of each greenhouse gas during planing of the small vessel during the entire cycle using the total operating time of the small vessel planing calculated in the life condition calculation step and the hourly emission amount of each greenhouse gas calculated in the combustion condition calculation step; and the total greenhouse gas emission amount of each greenhouse gas derived in the full-cycle greenhouse gas emission derivation step and in the combustion condition calculation step. It may be formed by including a DB storage step for storing the calculated hourly emissions and planing conditions of each greenhouse gas, the planing speed determined in the derivation step, the hull shape, and the displacement amount in a DB; a planing condition change step for proceeding from the planing condition derivation step by changing the planing speed input in the planing condition derivation step; and a DB comparison step for comparing the total emissions and changes in emissions for each small vessel according to multiple planing speeds stored in the DB storage step.

[0015] The above-mentioned planing condition derivation step may be characterized by comprising: a ship condition determination step for determining the hull shape and displacement of a small vessel selected in the above-mentioned target vessel selection step; a planing speed determination step for determining the planing speed of a small vessel whose hull shape and displacement were determined in the above-mentioned ship condition determination step; a simulation step for calculating the longitudinal inclination of a small vessel by inputting the hull shape of the small vessel determined in the above-mentioned ship condition determination step and the planing speed determined in the planing speed determination step into ship calculation software; a friction resistance coefficient calculation step for calculating the friction resistance coefficient of a small vessel determined in the above-mentioned ship condition determination step; and a total drag force calculation step for calculating the total drag force of a small vessel using the longitudinal inclination (trim) obtained in the above-mentioned simulation step and the friction resistance coefficient obtained in the friction resistance coefficient calculation step.

[0016] The combustion condition derivation step described above may be characterized by comprising: a required horsepower derivation step that calculates effective power by multiplying the total drag force and planing speed calculated in the planing condition derivation step, and derives the required horsepower required for planing of a small vessel by taking into account engine efficiency in the effective power; an engine selection step that selects an engine suitable for the horsepower derived in the required horsepower derivation step; a greenhouse gas data verification step that converts the required horsepower of the small vessel derived in the required horsepower derivation step into revolutions per minute (RPM) and verifies the amount of greenhouse gas corresponding to the RPM of the small vessel from the greenhouse gas data of the engine selected in the engine selection step; and an hourly greenhouse gas amount conversion step that converts the amount of greenhouse gas corresponding to the RPM of the small vessel verified in the greenhouse gas data verification step into an hourly greenhouse gas amount.

[0017] The above total drag force calculation step may be characterized by including a small vessel draft length and width ratio calculation step for calculating the ratio of the small vessel's submerged length and width, a small vessel submerged area calculation step for calculating the small vessel's submerged area, a friction resistance calculation step for calculating the friction resistance caused by the weight of the small vessel by inputting the ratio of the small vessel's submerged length and width calculated in the small vessel draft length and width ratio calculation step, and a small vessel total drag force calculation step for calculating the small vessel's total drag force by inputting the friction resistance calculated in the friction resistance calculation step and the longitudinal inclination obtained in the simulation step. Effects of the invention

[0019] The method for determining greenhouse gas emissions during planing of a small vessel using the full-life evaluation of the present invention has the effect of verifying the amount of greenhouse gases emitted during planing throughout the entire lifecycle of the small vessel.

[0020] In addition, the present invention has the effect of enabling the design of eco-friendly vessels with reduced greenhouse gas emissions by allowing comparison of greenhouse gas emissions through varying planing speeds of small vessels.

[0021] In addition, the present invention has the effect of enabling small vessels to operate in an environmentally friendly manner by determining the planing speed at which small vessels can minimize greenhouse gas emissions.

[0022] In addition, the present invention has the effect of determining the greenhouse gas emissions of a small vessel by reflecting the characteristic shape and planing state of the small vessel. Brief explanation of the drawing

[0024] Figure 1 is a drawing showing the shape of a small vessel. Figure 2 is a flowchart showing a method for determining greenhouse gas emissions during small vessel planing using the full-life evaluation of the present invention. Figure 3 is a flowchart showing the slide condition derivation step in Figure 2. Figure 4 is a flowchart showing the combustion condition calculation step in Figure 2. Figure 5 is a flowchart showing the total force calculation step in Figure 3. Figure 6 shows a bottom view of a small vessel showing variables for calculating the total drag force of the small vessel, Figure 7 shows a front view, and Figure 8 shows a side view. FIG. 9 is a graph showing the correlation between the sliding speed and the required horsepower according to one embodiment of the present invention, FIG. 10 is a graph showing the correlation between the revolutions per minute (RPM) and the required horsepower, FIG. 11 is a graph showing the correlation between the mass flow rate of CO2 by revolutions per minute (RPM), and FIG. 12 is a graph showing the correlation between the mass flow rate of CO by revolutions per minute (RPM). Fig. 13 is a graph comparing the full-cycle CO2 emissions according to changes in the planing speed of small vessels, and Fig. 14 is NO x This is a graph comparing the emissions of HC, and Figure 15 is a graph comparing the emissions of HC, and Figure 16 is a graph comparing the emissions of CO. Specific details for implementing the invention

[0025] The present invention will be described below with reference to the attached drawings. However, the present invention can be implemented in various different forms and is therefore not limited to the embodiments described herein.

[0026] Throughout the specification, when it is stated that a part is "connected (connected, in contact, combined)" with another part, this includes not only cases where they are "directly connected," but also cases where they are "indirectly connected" with other members interposed between them. Furthermore, when it is stated that a part "includes" a certain component, this means that, unless specifically stated otherwise, it does not exclude other components but rather allows for the inclusion of additional components.

[0027] The terms used herein are merely for describing specific embodiments and are not intended to limit the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this specification, terms such as “comprising” or “having” are intended to indicate the presence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0029] FIG. 1 is a drawing showing the shape of a small vessel (100), FIG. 2 is a flowchart showing a method for determining greenhouse gas emissions during planing of a small vessel (100) using the full-cycle evaluation of the present invention, FIG. 3 is a flowchart showing the planing condition derivation step in FIG. 2, FIG. 4 is a flowchart showing the combustion condition calculation step in FIG. 2, FIG. 5 is a flowchart showing the total drag force calculation step in FIG. 3, FIG. 6 is a bottom view of a small vessel showing variables for calculating the total drag force of the small vessel, FIG. 7 is a front view, and FIG. 8 is a side view.

[0030] The method for determining greenhouse gas emissions during planing of a small vessel (100) using the full-cycle evaluation of the present invention includes a target vessel selection step (S10), a planing condition derivation step (S20), a combustion condition calculation step (S30), a life condition calculation step (S40), a full-cycle greenhouse gas emission derivation step (S50), a DB storage step (S60), a planing condition change step (S70), and a DB comparison step (S80).

[0031] The above target vessel selection step (S10) selects a small vessel (100) to determine greenhouse gas emissions during planing using a full-cycle evaluation. The above small vessel (100) is a vessel currently in production or a vessel under development.

[0032] The above-mentioned planing condition derivation step (S20) includes a ship condition determination step (S21), a planing speed determination step (S23), a simulation step (S25), a friction resistance coefficient calculation step (S27), and a total drag force calculation step (S29). The above-mentioned planing condition derivation step (S20) determines the planing speed, hull shape, and displacement of the small vessel (100) selected in the target vessel selection step (S10), and calculates the total drag force of the small vessel (100) based on this.

[0033] The above-mentioned ship condition determination step (S21) determines the hull shape and displacement of the small vessel (100) selected in the target vessel selection step (S10). The above-mentioned ship condition determination step (S21) is characterized by reflecting the characteristic shape of the small vessel (100), which is the chain. The above-mentioned ship condition determination step (S21) has the effect of determining the greenhouse gas emissions of the small vessel (100) by reflecting the resistance reduction of the small vessel (100) that the chain shape of the small vessel (100) possesses.

[0034] The above-mentioned planing speed determination step (S23) determines the planing speed of a small vessel (100) whose hull shape and displacement were determined in the vessel condition determination step (S21).

[0035] The simulation step (S25) inputs the hull shape of the small vessel (100) determined in the vessel condition determination step (S21) and the planing speed determined in the planing speed determination step (S23) into the vessel calculation software to obtain the longitudinal inclination (trim) of the small vessel (100). The simulation step (S25) is characterized by using Maxsurf Stability as the vessel calculation software.

[0036] The above friction resistance coefficient calculation step (S27) calculates the friction resistance coefficient of the small vessel (100) determined in the vessel condition determination step (S21). The above friction resistance coefficient (C f The calculation step (S27) calculates the coefficient of friction resistance (C) by inputting the Reynolds number (Re) based on the ITTC formula. f The equation is C f = 0.075 / (log 10Re-2) 2 The Reynolds number (Re) equation is Re = VL / ν. The Reynolds number (Re) is a number representing the ratio of inertial force to viscous force in fluid flow, where V = speed of the ship, L = length of the ship, and ν = viscosity coefficient (which changes with seawater temperature).

[0037] The above total drag calculation step (S29) includes a step for calculating the ratio of the draft length to the width of the small vessel (S29-1), a step for calculating the submerged area of ​​the small vessel (S29-3), a step for calculating frictional resistance (S29-5), and a step for calculating the total drag of the small vessel (S29-7). The above total drag calculation step (S29) calculates the total drag of the small vessel (100) using the trim obtained in the simulation step (S25) and the frictional resistance coefficient obtained in the frictional resistance coefficient calculation step (S27). The above total drag calculation step (S29) calculates the total drag of the small vessel (100) using the Savitsky resistance estimation method. The above Savitsky resistance estimation method is suitable for estimating the resistance of a small vessel (100) sailing at a high speed with a planing hull shape. The above total drag force calculation step (S29) is characterized by reflecting the draft area of ​​the small vessel (100) during sailing, thereby reflecting the planing state of the small vessel (100) during sailing. Since the above total drag force calculation step (S29) reflects the planing state of the small vessel during sailing, it has the effect of calculating the drag force received when the small vessel (100) is actually operating.

[0038] The above step of calculating the ratio of the draft length and width of the small vessel (S29-1) calculates the ratio (λ) of the length and width of the small vessel (100) submerged in water. The formula for calculating the ratio (λ) of the length and width of the small vessel (100) submerged in water is λ = l wl / b and l wl = The length of the hull at the waterline, b = the width of the hull at the waterline.

[0039] Step (S29-3) for calculating the submerged area of ​​the small vessel: The submerged area (S) of the small vessel (100) is calculated. The formula for calculating the submerged area (S) of the small vessel (100) is S = l wl bsec(β)=λb 2 / cos(β), where β = the angle of inclination of the planing vessel.

[0040] The above frictional resistance calculation step (S29-5) inputs the ratio of the length and width (λ) of the small vessel (100) submerged in water, calculated in the small vessel draft length and width ratio calculation step (S29-1), and calculates the frictional resistance (D) caused by the weight of the small vessel (100). f Calculate ), frictional resistance (D f The formula for calculating ) is D f = C f ρV 2 (λb 2 ) / 2cos(β), where ρ = density of seawater (changes with seawater temperature). The density of seawater is based on the freshwater and seawater characteristics data published by ITTC.

[0041] The above small vessel total drag calculation step (S29-7) is the frictional resistance (D) calculated in the frictional resistance calculation step (S29-5). f The total drag force (D) of the small vessel (100) is calculated by inputting the longitudinal inclination (trim) obtained in the ) and simulation step (S25). The formula for calculating the total drag force (D) is D = △tan(τ) + D f / cos(τ), △ = displacement force, and τ = longitudinal inclination of the planing vessel.

[0042] The combustion condition calculation step (S30) includes a required horsepower derivation step (S31), an engine selection step (S33), a greenhouse gas data verification step (S35), and an hourly greenhouse gas amount conversion step (S37). The combustion condition calculation step (S30) calculates the hourly emission amount of each greenhouse gas emitted during planing of the small vessel (100) using the total drag force calculated in the planing condition derivation step (S20).

[0043] The above-mentioned step for deriving required horsepower (S31) calculates effective power by multiplying the total drag force calculated in the step for deriving planing conditions (S20) by the planing speed, and derives the required horsepower required for planing of a small vessel by taking into account engine efficiency in the effective power. The above-mentioned step for deriving required horsepower (S31) is characterized by setting the engine efficiency to 50% to 60%.

[0044] The above engine selection step (S33) selects an engine suitable for the horsepower derived in the required horsepower derivation step (S31).

[0045] The above greenhouse gas data verification step (S35) converts the required horsepower of the small vessel (100) derived in the required horsepower derivation step (S31) into revolutions per minute (RPM), and verifies the amount of greenhouse gas corresponding to the revolutions per minute (RPM) of the small vessel (100) from the greenhouse gas data of the engine selected in the engine selection step (S33). The above greenhouse gas data verification step (S35) utilizes greenhouse gas data by revolutions per minute (RPM) of the engine prepared by the engine manufacturer for the corresponding engine, and if there is no greenhouse gas data by revolutions per minute (RPM) of the engine, the data is verified by conducting an experiment directly. The greenhouse gases verified in the above greenhouse gas data verification step (S35) are characterized by including carbon dioxide (CO2), hydrocarbons (HC), carbon monoxide (CO), and nitrogen oxides (NOx).

[0046] The above-mentioned hourly greenhouse gas amount conversion step (S37) converts the greenhouse gas amount corresponding to the revolutions per minute (RPM) of the small vessel (100) confirmed in the greenhouse gas data verification step (S35) into an hourly greenhouse gas amount.

[0047] The above life condition calculation step (S40) calculates the total operating time during the entire cycle of the small vessel (100) selected in the target vessel selection step (S10). The above life condition calculation step (S40) calculates the total operating time by assuming the lifespan and operating schedule of the small vessel (100). The above life condition calculation step (S40) is characterized by estimating using statistics such as the age distribution of registered vessels having internal combustion engines of similar size.

[0048] The above-mentioned step for deriving greenhouse gas emissions for the entire cycle (S50) derives the total emissions of each greenhouse gas during the planing of the small vessel (100) over the entire cycle using the total planing operating time of the small vessel (100) calculated in the life condition calculation step (S40) and the hourly emission amount of each greenhouse gas calculated in the combustion condition calculation step (S30). The above-mentioned step for deriving greenhouse gas emissions for the entire cycle (S50) derives the total emissions of each greenhouse gas by multiplying the total planing time and the hourly emission amount of each greenhouse gas. The above-mentioned step for deriving greenhouse gas emissions for the entire cycle (S50) is characterized by deriving the greenhouse gas emissions generated during the actual sailing time of the small vessel (100). The above-mentioned step for deriving greenhouse gas emissions for the entire cycle (S50) has the effect of deriving the greenhouse gas emissions actually emitted by the small vessel (100) during planing.

[0049] The above DB storage step (S60) stores in the DB the total greenhouse gas emissions derived in the full-cycle greenhouse gas emission derivation step (S50), the hourly emissions of each greenhouse gas calculated in the combustion condition calculation step (S30), and the sliding speed, linearity, and displacement determined in the sliding condition derivation step (S20).

[0050] The above-mentioned planing condition change step (S70) proceeds from the planing condition derivation step (S20) by changing the planing speed input in the planing condition derivation step (S20). The above-mentioned planing condition change step (S70) is characterized by changing the planing speed of the small vessel (100) and accumulating data on the total amount of exhaust gas according to the planing speed of the small vessel (100) in the DB. The above-mentioned planing condition change step (S70) is performed repeatedly by changing the planing speed of the small vessel (100), and allows for comparison of the total amount of exhaust gas according to the planing speed. In addition to the planing speed, the above-mentioned planing condition change step (S70) may change the hull shape or displacement of the small vessel (100) and accumulate data on the total amount of exhaust gas according to the hull shape and displacement of the small vessel (100) in the DB.

[0051] The above DB comparison step (S80) compares the total emission amount and change amount for each exhaust gas of the small vessel (100) according to multiple planing speeds stored in the DB storage step (S60). The above DB comparison step (S80) can compare the total emission amount and change amount for each exhaust gas of the small vessel (100) according to multiple hull types and displacements stored in the DB storage step (S60) in addition to the planing speed. The above DB comparison step (S80) is characterized by comparing the total emission amount for each exhaust gas according to the planing conditions of the small vessel (100) and using this as a reference and incorporating it into the design of the small vessel (100). By comparing the total emission amount and change amount for each exhaust gas according to the planing conditions of the small vessel (100), the above DB comparison step (S80) can identify operating conditions that minimize greenhouse gas emissions of the small vessel (100) and has the effect of enabling the small vessel (100) to operate in an environmentally friendly manner.

[0052] A method for determining greenhouse gas emissions during planing of a small vessel (100) using a full-cycle evaluation is characterized by being able to derive the amount of greenhouse gas emissions generated according to the vessel's operating conditions (displacement, shape, planing speed).

[0053] A method for determining greenhouse gas emissions during planing of a small vessel (100) using a full-cycle evaluation is characterized by being able to derive total exhaust gas emissions over the entire lifespan of the vessel during planing.

[0054] The method for determining greenhouse gas emissions during planing of a small vessel (100) using a full-cycle evaluation is characterized by being able to accurately measure the resistance generated during planing of a small vessel by reflecting the planing state, which is a characteristic shape of the small vessel, in the total drag force.

[0056] FIG. 9 is a graph showing the correlation between planing speed and required horsepower according to an embodiment of the present invention, FIG. 10 is a graph showing the correlation between revolutions per minute (RPM) and required horsepower, FIG. 11 is a graph showing the correlation between the mass flow rate of CO2 by revolutions per minute (RPM), FIG. 12 is a graph showing the correlation between the mass flow rate of CO by revolutions per minute (RPM), FIG. 13 is a graph comparing the CO2 emissions over the entire cycle according to changes in the planing speed of a small vessel, and FIG. 14 is NO x This is a graph comparing the emissions of HC, Figure 15 is a graph comparing the emissions of HC, and Figure 16 is a graph comparing the emissions of CO.

[0057] In the following, an example is described in which greenhouse gas emissions during the entire cycle of a small vessel (100) are determined according to the method for determining greenhouse gas emissions during the entire cycle of a small vessel using the full-cycle evaluation of the present invention.

[0058] The target vessel selection step (S10) selects a 52-foot class composite material small vessel (100).

[0059] The planing condition derivation step (S20) determines the planing speed, hull shape, and displacement of the small vessel (100) and inputs them into the vessel calculation software to derive the resistance estimation elements of the small vessel.

[0060] The ship condition determination step (S21) determines the ship's hull shape and displacement. The small ship (100) is a ship with a typical hull shape defined as a Cruiser class among GFRP ships, has a hull shape, and has specifications of a hull length of 15.9m and a displacement of 25.47t.

[0061] The planing speed of the small vessel (100) determined in the planing speed determination step (S23) is 15 knots.

[0062] The simulation step (S25) inputs the planing speed of the small vessel 15 knots and the hull shape into Maxsurf Stability software to simulate and obtain the trim, and the trim is calculated as 6.56 deg.

[0063] The above friction resistance coefficient calculation step (S27) calculates the friction resistance coefficient of the small vessel (100). The Reynolds number (Re) of the small vessel (100) is 8.53 × 10⁻⁶ 7 It is calculated as, and the coefficient of friction resistance is 2.13×10 -3 It is calculated as follows. When calculating the Reynolds number (Re), the viscosity coefficient (ν) is 1.189 × 10⁻⁶, which is the viscosity coefficient (ν) at a seawater temperature of 15°C. 7 Entered.

[0064] The above total drag force calculation step (S29) is a longitudinal inclination (trim) of 6.56 deg and a friction resistance coefficient of 2.13 × 10 -3 Calculate by substituting. In the above total force calculation step (S29), frictional resistance (D f The force is calculated to be 3.850kN, and the total force is 32.579kN.

[0065] The above combustion condition calculation step (S30) calculates the hourly emission amount of each greenhouse gas emitted during the planing of the small vessel (100) using the total drag force of 32.579 kN calculated in the planing condition derivation step (S20).

[0066] The above required horsepower derivation step (S31) calculates an effective power of 251.401 kW by multiplying the total drag (32.579 kN) calculated in the planing condition derivation step (S20) by the speed (15 knots = 7.716 m / s), and calculates the required power of 419.002 kW (251.401 kW / 0.6 = 419.002 kW) by assuming an engine efficiency of 60%. When the above required power of 419.002 kW is converted to horsepower, the required horsepower becomes 561.891 hp.

[0067] The engine selection step (S33) selects an engine suitable for the horsepower derived in the required horsepower derivation step (S31). The engine selection step (S33) is set such that the small vessel (100) uses diesel as fuel and has two internal combustion engines. The required horsepower derived in the required horsepower derivation step (S31) is 561.891 hp, and the required horsepower for one internal combustion engine is 280.946 hp. The engine selection step (S33) selects the Volvo Penta D6 435 engine, which is capable of producing an output of 280.946 hp, the required horsepower for one internal combustion engine.

[0068] The above greenhouse gas data verification step (S35) refers to the D6 435 engine report measured by Volvo Penta to verify the revolutions per minute (RPM) according to horsepower, and derives the revolutions per minute (RPM) of the small vessel (100) through the correlation between the required horsepower and the revolutions per minute. The amount of greenhouse gas corresponding to the revolutions per minute (RPM) of the small vessel (100) is verified through the correlation between the greenhouse gas components and the revolutions per minute (RPM) by referring to the D6 435 engine report.

[0069] The above-mentioned hourly greenhouse gas amount conversion step (S37) converts the greenhouse gas amount corresponding to the revolutions per minute (RPM) of the small vessel confirmed in the greenhouse gas data verification step (S35) into an hourly greenhouse gas amount.

[0070] The above life condition calculation step (S40) assumes that the vessel operates on the coast using an internal combustion engine and is used for 20 years based on domestic registered vessel statistics. The small vessel (100) is calculated to operate twice a week, sailing for 4 hours per trip, for a total of 8,320 hours over 20 years.

[0071] The above-mentioned step for deriving greenhouse gas emissions throughout the entire cycle (S50) derives the total greenhouse gas emissions for each greenhouse gas during the entire cycle of the small vessel (100) planing by multiplying the total operating time of the small vessel (100) calculated in the life condition calculation step (S40) and the hourly greenhouse gas emission amount calculated in the combustion condition calculation step (S30). Referring to FIGS. 13 to 16, the CO derived in the above-mentioned step for deriving greenhouse gas emissions throughout the entire cycle (S50) is 4,454.04 kg, CO2 is 887,064.28 kg, NOx is 7,071.71 kg, and HC is 582.64 kg.

[0072] The above DB storage step (S60) stores the total greenhouse gas emissions derived in the full-cycle greenhouse gas emission derivation step (S50) and the sliding speed, linearity, and displacement determined in the sliding condition derivation step (S20) in the DB, and the storage record becomes case1.

[0073] The above-mentioned planing condition change step (S70) proceeds from the planing condition derivation step (S20) by increasing the planing speed input in the planing condition derivation step (S20) by 5 knots to 20 knots, and the total greenhouse gas emissions, planing speed, linear shape, and displacement derived by changing the planing speed become case 2.

[0074] The above DB comparison step (S80) compares case1 and case2 stored in the DB storage step (S60) to use as a reference for the design of the small vessel (100), and identifies operating conditions that can minimize greenhouse gas emissions of the small vessel (100), thereby enabling the small vessel (100) to operate in an environmentally friendly manner. Referring to FIGS. 13 to 16, as a result of comparing case2 with case1 in the above DB comparison step (S80), CO₂ decreased, and CO₂ 2, NOx and HC were found to have increased.

[0076] In addition to the above, the foregoing description of the present invention is for illustrative purposes only, and those skilled in the art will understand that other specific forms can be easily modified without altering the technical spirit or essential features of the present invention. Therefore, the embodiments described above should be understood as illustrative in all respects and not restrictive. For example, each component described as a single unit may be implemented in a distributed or divided manner, and likewise, components described as distributed or divided may be implemented in a combined form within the scope of understanding of those skilled in the art.

[0077] The scope of the present invention is defined by the claims set forth below, and all modifications or variations derived from the meaning and scope of the claims and equivalent concepts thereof should be interpreted as being included within the scope of the present invention. Explanation of the symbols

[0079] 100 : Small vessel

Claims

Claim 1 A method for determining greenhouse gas emissions during planing of a small vessel, performed by an information processing device, comprising: a target vessel selection step for selecting a small vessel to determine greenhouse gas emissions during planing using a full-cycle evaluation; a planing condition derivation step for determining the planing speed, hull shape, and displacement of the small vessel selected in the target vessel selection step and calculating the total drag force of the small vessel based thereon; a combustion condition calculation step for calculating the hourly emission amount of each greenhouse gas emitted during planing of the small vessel using the total drag force calculated in the planing condition derivation step; a life condition calculation step for calculating the total operating time of the small vessel selected in the target vessel selection step for planing during the full cycle; and a full-cycle greenhouse gas emission derivation step for deriving the total emissions of each greenhouse gas during planing of the small vessel over the full cycle using the total operating time of the small vessel planing calculated in the life condition calculation step and the hourly emission amount of each greenhouse gas calculated in the combustion condition calculation step. A DB storage step for storing in a DB the total greenhouse gas emissions derived in the full-cycle greenhouse gas emission derivation step, the hourly emissions and planing conditions of each greenhouse gas calculated in the combustion condition calculation step, and the planing speed, hull shape, and displacement determined in the derivation step; a planing condition change step for proceeding from the planing condition derivation step by changing the planing speed input in the planing condition derivation step; and a DB comparison step for comparing the total emissions and changes in emissions for each small vessel according to a plurality of planing speeds stored in the DB storage step; wherein the planing condition derivation step comprises: a vessel condition determination step for determining the hull shape and displacement of a small vessel selected in the target vessel selection step; a planing speed determination step for determining the planing speed of a small vessel whose hull shape and displacement were determined in the vessel condition determination step; and a simulation step for calculating the longitudinal inclination of a small vessel by inputting the hull shape of the small vessel determined in the vessel condition determination step and the planing speed determined in the planing speed determination step into ship calculation software. A friction resistance coefficient calculation step for determining the friction resistance coefficient of a small vessel determined in the above-mentioned vessel condition determination step;A method for determining greenhouse gas emissions during planing of a small vessel using a full-cycle evaluation, comprising: a total drag calculation step for calculating the total drag of a small vessel using the trim obtained in the simulation step and the frictional drag coefficient obtained in the frictional drag coefficient calculation step. Claim 2 delete Claim 3 In claim 1, the combustion condition calculation step comprises: a required horsepower derivation step for calculating effective power by multiplying the total drag force and planing speed calculated in the planing condition derivation step, and deriving the required horsepower required for planing of a small vessel by taking into account engine efficiency in the effective power; an engine selection step for selecting an engine suitable for the horsepower derived in the required horsepower derivation step; a greenhouse gas data verification step for converting the required horsepower of the small vessel derived in the required horsepower derivation step into revolutions per minute (RPM) and verifying the amount of greenhouse gas corresponding to the RPM of the small vessel from the greenhouse gas data of the engine selected in the engine selection step; and an hourly greenhouse gas amount conversion step for converting the amount of greenhouse gas corresponding to the RPM of the small vessel verified in the greenhouse gas data verification step into an hourly greenhouse gas amount; a method for determining greenhouse gas emissions during planing of a small vessel using a full-cycle evaluation. Claim 4 A method for determining greenhouse gas emissions during planing of a small vessel using a full-cycle evaluation, wherein the total drag force calculation step comprises: a small vessel draft length-to-width ratio calculation step for calculating the ratio of the small vessel's submerged length to its width; a small vessel submerged area calculation step for calculating the small vessel's submerged area; a frictional resistance calculation step for calculating the frictional resistance generated by the weight of the small vessel by inputting the ratio of the small vessel's submerged length to its width calculated in the small vessel draft length-to-width ratio calculation step; and a small vessel total drag force calculation step for calculating the total drag force of the small vessel by inputting the frictional resistance calculated in the frictional resistance calculation step and the longitudinal inclination obtained in the simulation step.

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