Hot wind electric heating defrosting scheme design method for polar region ship cab glass

Abstract

The invention relates to a hot wind electric heating defrosting scheme design method for polar region ship cab glass. The method comprises the steps that the cab clear height, the cabin wall inclination angle, the cab glass height and the cab glass length of a ship are obtained; according to the height and the length of the cab glass, the number of tuyeres required by the glass and the distance between the tuyeres are determined, and the single-tuyere average air speed meeting the minimum defrosting air volume requirement is calculated; according to the optimal impact angle and the bulkhead inclination angle, determining an air outlet air supply recommended angle, and calculating the single-air-outlet air speed meeting the impact point speed requirement; the larger value of the single-air-port average air speed and the single-air-port air speed is selected as the minimum value of the air supply speed of the air ports of the hot air defrosting system; and according to the minimum value of the air supply speed of the air outlets of the hot air defrosting system, the minimum value of the single-air-outlet air supply amount and the minimum value of the total air supply amount are determined, and model selection of the air outlets and fans is conducted based on obtained results. According to the method, equipment type selection and air port arrangement design of the hot air defrosting system can be rapidly and reasonably carried out.

Description

Technical Field

[0001] The invention relates to the technical field of safe navigation and HVAC design of ships, and in particular to a design method for a hot wind electric heating defrosting solution for polar ship cab glass. Background Art

[0002] The polar regions have attracted much attention due to their unique geographical location and rich resources. Among them, polar ships, as necessary carriers for opening polar routes, providing material supplies and scientific expeditions, are an important tool for countries to promote polar strategies. However, the polar environment is harsh and the climate is cold. Most areas are covered with ice and snow all year round. There are often heavy fog, wind and snow, and extremely poor visibility, which poses a great safety hazard to navigation. At the same time, for polar ships, the cab is almost airtight, the air circulation is very poor, and the indoor humidity is high due to the breathing of people inside, sweating of the skin, and moisture release of food and water. At the same time, coupled with the low outdoor temperature, the glass is directly exposed to the cold environment, the surface temperature is low, and the temperature difference between indoor and outdoor is extremely large. The air temperature near the glass side of the cab will drop rapidly to become saturated humid air, and water vapor will gather on the inner surface of the glass and seep out in the form of tiny water droplets to form fog.

[0003] At the same time, the temperature of the inner surface of the glass can reach below -10℃, which is lower than the freezing point of 0℃. The precipitated water vapor will quickly condense into frost. If it is not defrosted in time, it will affect the driving vision and endanger the safety of navigation. Therefore, timely solving the problem of defrosting and defrosting of windshields is crucial to the safety of polar ship driving. In view of the problem that the inner surface of the window glass in the ship's cab is easy to frost, most of them currently use electric heating glass heating defrosting or defrosting system to blow hot air to defrost. However, electric heating glass alone is not enough to cope with the harsh polar environment, and the defrosting effect is poor; and the hot air defrosting system alone cannot cope with the harsh polar environment, and the defrosting rate is slow. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a design method for a hot air electric heating defrosting scheme for polar ship cab glass, which can quickly and reasonably perform equipment selection and air outlet layout design of a hot air defrosting system.

[0005] The technical solution adopted by the present invention to solve the technical problem is: to provide a design method for a hot wind electric heating defrosting solution for polar ship cab glass, comprising the following steps:

[0006] Obtain the ship's wheelhouse clear height, bulkhead inclination, wheelhouse glass height and wheelhouse glass length;

[0007] Determine the minimum frost air volume required for the glass according to the height of the cab glass and the length of the cab glass, determine the number of air vents required for the glass and the air vent spacing according to the length of the cab glass, and determine the average wind speed of a single air vent that meets the minimum frost air volume requirement according to the minimum frost air volume and the number of air vents required for the glass;

[0008] Determine the recommended air outlet angle according to the optimal impact angle and the bulkhead inclination angle, calculate the jet distance from the air outlet to the jet geometric impact point in combination with the clear height of the cab, and determine the single air outlet wind speed that meets the impact point speed requirement according to the jet distance;

[0009] Compare the single air outlet average wind speed with the single air outlet wind speed, and take the larger value of the two as the minimum value of the air supply speed of the hot air defrosting system air outlet;

[0010] Determine the minimum value of the single air outlet air supply volume and the minimum value of the total air supply volume according to the minimum value of the air outlet air supply speed of the hot air defrosting system, the preset air outlet diameter, and the number of air outlets required for the glass;

[0011] The air outlet is selected based on the minimum air supply volume of a single air outlet, and the fan is selected based on the minimum total air supply volume.

[0012] The minimized frost air volume is Q F =0.015l·b, where Q F To minimize the amount of frost, l is the length of the cab glass and b is the width of the cab glass.

[0013] The number of air vents and the air vent spacing required for the glass are calculated based on the length of the cab glass through a performance mode formula or an economic mode formula.

[0014] The average wind speed of the single air outlet is Calculated, where v 0Q is the average wind speed at a single outlet, Q F To minimize the frost air volume, D is the set air outlet diameter and n is the number of air outlets required for the glass.

[0015] The jet distance is through Calculated, where H is the jet distance, h Net is the net height of the cab, h eyes is the sight height of people, θ is the recommended air supply angle of the tuyere, expressed as: θ = α-β, α is the optimal impact angle, β is the inclination angle of the bulkhead.

[0016] The single tuyere wind speed is Calculated, where v 0H is the wind speed of a single tuyere, H is the jet distance, and D is the set tuyere diameter.

[0017] The method for designing a hot wind electric heating defrosting scheme for polar ship cab glass also includes determining the front and rear arrangement distance of the air outlet according to the recommended air outlet air supply angle and the clear height of the cab, wherein the front and rear arrangement distance of the air outlet is determined by L=(h Net -h eyes )(tanθ+tanβ) is calculated, where L is the distance between the front and rear of the tuyere, h Net is the net height of the cab, h eyes is the sight height of people, θ is the recommended air supply angle of the tuyere, and β is the inclination angle of the bulkhead.

[0018] The minimum air volume of a single air outlet is Q0 = 900π·D 2 v0 is calculated, and the minimum total air supply volume is obtained by Q = 900π·D 2 (n·v0) is calculated, where Q0 is the minimum air supply volume of a single air outlet, Q is the minimum total air supply volume, D is the set air outlet diameter, v0 is the minimum air supply speed of the hot air defrosting system air outlet, and n is the number of air outlets required for the glass.

[0019] The technical solution adopted by the present invention to solve its technical problem is: to provide an electronic device, including a memory, a processor and a computer program stored in the memory and executable on the processor, and the processor implements the steps of the above-mentioned method for designing a hot air electric heating defrosting solution for the glass of the polar ship's cab when executing the computer program.

[0020] The technical solution adopted by the present invention to solve its technical problem is: providing a computer-readable storage medium on which a computer program is stored, and when the computer program is executed by a processor, the steps of the above-mentioned hot air electric heating defrosting solution design method for polar ship cab glass are implemented.

[0021] Beneficial Effects

[0022] Due to the adoption of the above-mentioned technical scheme, the present invention has the following advantages and positive effects compared with the prior art: the present invention provides a reasonable equipment selection and layout form of the hot air defrosting system based on the relevant parameters of the ship's cab, so that the defrosting rate can be increased by using supplementary hot air as auxiliary heat for electric heating defrosting, thereby achieving rapid and effective defrosting of the inner surface of the cab glass. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a flow chart of a design method for a hot wind electric heating defrosting solution for polar ship cab glass according to an embodiment of the present invention;

[0024] Figure 2 Schematic diagram of the design of the upper ball head air supply auxiliary defrosting solution in an embodiment of the present invention;

[0025] Figure 3 It is a comparison diagram of the effects of the embodiment of the present invention and the existing solution. DETAILED DESCRIPTION

[0026] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall within the scope limited by the appended claims of the application equally.

[0027] The embodiment of the present invention relates to a design method for hot air electric heating defrosting scheme for polar ship cab glass. The method can provide a reasonable equipment selection and layout form of the hot air defrosting system based on the relevant parameters of the ship cab, so that the defrosting rate can be increased by using supplementary hot air as auxiliary heat for electric heating defrosting, thereby realizing fast and effective hot air defrosting of the inner surface of the cab glass. Figure 1 As shown, the method specifically comprises the following steps:

[0028] Step 1, obtain the clear height of the ship's wheelhouse, the inclination of the bulkhead, the height of the wheelhouse glass, and the length of the wheelhouse glass. This step can read the relevant parameters of the ship's wheelhouse according to the ship's design drawings, including the clear height of the ship's wheelhouse and the inclination of the bulkhead, and read the relevant parameters of each piece of glass in the wheelhouse window, including the glass height and glass length. At the same time, determine the air outlet diameter of the defrost nozzle.

[0029] Step 2: determine the minimum frost air volume required for the glass based on the cab glass height and the cab glass length, determine the number of air vents required for the glass and the air vent spacing based on the cab glass length, and determine the average wind speed of a single air vent that meets the minimum frost air volume requirement based on the minimum frost air volume and the number of air vents required for the glass.

[0030] In this step, the air volume required for each square meter of glass area is 0.015m 3 / s, the minimum frost wind volume required for the glass is determined by combining the height of the cab glass and the length of the cab glass. The calculation method is:

[0031] Q F ≥0.015l·b(m 3 / s)=54l·b(m 3 / h)

[0032] Among them, Q F To minimize the amount of frost, l is the length of the cab glass and b is the width of the cab glass.

[0033] Then, according to the length of the cab glass, the number of air vents required for the glass is determined by the performance mode formula or the economic mode formula, and the air vent spacing is determined. The expression is:

[0034]

[0035] Wherein, S is the air outlet spacing, D is the air outlet diameter, n1 is the number of air outlets required for the glass calculated under the performance mode, n2 is the number of air outlets required for the glass calculated under the economy mode, f1() is the performance mode formula, f2() is the economy mode formula, x1 represents the optimal ratio of the air outlet spacing to the air outlet diameter corresponding to a single piece of glass under the performance mode, and x2 represents the recommended ratio of the air outlet spacing to the air outlet diameter corresponding to a single piece of glass under the economy mode.

[0036] Then, the average wind speed v of a single air outlet that meets the requirement of minimizing the frost air volume is determined according to the minimized frost air volume and the number of air outlets required for the glass. 0Q , calculated as:

[0037]

[0038] Step 3, determine the recommended air supply angle of the air outlet according to the optimal impact angle and the bulkhead inclination angle, calculate the jet distance from the air outlet to the jet geometric impact point in combination with the clear height of the cab, and determine the single air outlet wind speed that meets the impact point speed requirement according to the jet distance.

[0039] The optimal impact angle in this step can be obtained by simulation. The recommended air supply angle of the tuyere can be obtained by subtracting the optimal impact angle from the bulkhead inclination angle, and its expression is:

[0040] θ=α-β

[0041] Among them, θ is the recommended air supply angle of the tuyere, α is the optimal impact angle, and β is the inclination angle of the bulkhead.

[0042] The obtained recommended air outlet angle is combined with the clear height of the cab, and then according to the personnel sight height in "Ergonomics" and "Chinese Adult Human Body Dimensions", the jet distance from the air outlet to the jet geometric impact point can be calculated, and the calculation method is:

[0043]

[0044] Where H is the jet distance, h Net is the net height of the cab, h eyes The height of a person's eye.

[0045] Based on the above information, the front and rear arrangement distance of the air outlet can also be calculated. The specific calculation method is:

[0046] L=(h Net -h eyes)(tanθ+tanβ)

[0047] Among them, L is the distance between the front and rear of the air outlet.

[0048] According to the ISO7547:2022 standard, the wind speed sprayed onto the glass window is 1.5m / s. According to the gas jet formula, the single vent wind speed that meets the impact point speed requirement is calculated. The calculation expression is:

[0049]

[0050] Step 4: compare the single air outlet average wind speed with the single air outlet wind speed, and take the larger value of the two as the minimum value of the air outlet air supply speed of the hot air defrosting system, that is, v0≥max(v 0Q ,v 0H ), where v0 is the minimum air supply velocity of the hot air defrosting system.

[0051] Step 5, determining the minimum single air outlet air volume and the minimum total air volume according to the minimum air outlet air supply speed of the hot air defrosting system, the preset air outlet diameter, and the number of air outlets required for the glass.

[0052] In this step, the minimum air supply volume of a single air outlet can be obtained according to the minimum air supply speed of the hot air defrosting system air outlet and the preset air outlet diameter. The calculation method is:

[0053] Q0=900π·D 2 v0

[0054] Among them, Q0 is the minimum air supply volume of a single air outlet.

[0055] The minimum value of the single air outlet air supply volume can be obtained by combining the number of air outlets required for the glass to obtain the minimum value of the total air supply volume. The calculation method is:

[0056] Q=n·Q0=900π·D 2 (n·v0)

[0057] Among them, Q is the minimum total air supply volume.

[0058] Step 6, select the air outlet type according to the minimum air supply volume of a single air outlet, and select the fan type according to the minimum total air supply volume.

[0059] It can be seen that the present invention can quickly and reasonably select equipment and design the layout of air outlets for the hot air defrosting system based on the relevant parameters of the ship's cab. The present invention is further described below through a specific embodiment.

[0060] This embodiment provides an optimization design process for hot air and electric heating defrosting of the glass in the driving room of a polar ship, which specifically includes the following steps:

[0061] First, according to the existing ship design drawings, read the relevant parameters of the ship's cab (cab net height and bulkhead inclination), read the relevant parameters of each piece of cab window glass (glass height and glass length). At the same time, determine the air outlet diameter of the defrost nozzle, and the parameters are shown in Table 1.

[0062] Table 1 Ship cab parameters

[0063]

[0064] Secondly, based on the ISO7547:2022 standard, the required air volume per square meter of glass area is 0.015m 3 / s, calculate the minimum frost air volume Q required for the glass F :

[0065] Q F ≥54l·b=54×1.8×1.8=175(m 3 / h)

[0066] According to the glass length, the performance mode formula or the economic mode formula (the formulas in the two modes are applicable to the case where the glass length is greater than 2400mm and the number of air outlets is greater than 2) is used to calculate the recommended number of air outlets corresponding to the glass, and the left and right air outlet spacing is determined. The formulas for the two modes in this embodiment are as follows:

[0067]

[0068] When the glass length is not more than 1400mm, the recommended number of air vents is 1; when the glass length is greater than 1400mm and not more than 2400mm, the recommended number of air vents is 2. When the glass length is not more than 1650mm, the recommended air vent spacing is 480mm, and when it is greater than 1650mm, the recommended air vent spacing is 800mm.

[0069] Since the glass length of the window in this embodiment is 1800mm, which is less than 2400mm, it is not applicable to the two-mode formula. Since it is greater than 1650mm and less than 2400mm, the number of air outlets is 2, and the air outlet spacing is 800mm. Further calculate the average wind speed of a single air outlet that meets the defrosting air volume requirements:

[0070]

[0071] Then, based on the optimal impact angle (45°) obtained from the simulation and the bulkhead inclination angle obtained from the drawings, the recommended inclination angle of the air outlet is calculated:

[0072] θ=α-β=45-15=30(°)

[0073] Then, according to the clear height of the cab in the drawing, combined with the personnel sight height in "Ergonomics" and "Human Body Dimensions of Chinese Adults" (the average value of adult male and female is 1.5m), calculate the jet distance from the air outlet to the geometric impact point of the jet:

[0074]

[0075] At the same time, calculate the front and rear arrangement distance of the air outlet on the ceiling:

[0076] L=(h Net -h eyes )(tanθ+tanβ)=(2.250-1.500)(tan30°+tan15°)=0.634(m)

[0077] According to the ISO7547:2022 standard, the wind speed at the glass window must reach 1.5 m / s. According to the gas jet formula, the single vent wind speed that meets the impact point speed requirement is calculated:

[0078]

[0079] Then, the maximum value of the single vent average wind speed that meets the defrosting air volume requirement and the single vent wind speed that meets the impact point speed requirement is selected and used as the minimum value of the air supply speed of the hot air system corresponding to the glass, that is:

[0080] v0≥max(v 0Q ,v 0H )=max(4.8,3.0)=4.8(m / s)

[0081] Finally, calculate the minimum single air outlet air volume and the minimum total air volume, and use the calculated results to select the air outlet and fan. Among them, the minimum single air outlet air volume is:

[0082] Q0=900π·D 2 v0=900×π×0.08 2 ×4.8=87(m 3 / h)

[0083] The minimum total air supply volume is:

[0084] Q=n·Q0=900π·D 2 (n·v0)=900×π×0.08 2 ×(2×4.8)=174(m 3 / h)

[0085] The output parameters are shown in Table 2.

[0086] Table 2 Output parameter table

[0087]

[0088] Figure 3 The red frame is the defrost simulation result of the hot air system design using the above-mentioned optimization design method. It can be found that when the solution of this implementation is used, the clarity of the cab window glass is far better than other solutions, which can significantly improve the clarity of the field of view.

[0089] A second embodiment of the present invention relates to an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of the method for designing a hot wind electric heating defrosting scheme for the glass of a polar ship's cab of the first embodiment are implemented.

[0090] The third embodiment of the present invention relates to a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the hot wind electric heating defrosting scheme design method for polar ship cab glass of the first embodiment.

[0091] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) that contain computer-usable program code.

[0092] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0093] These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-readable memory produce a manufactured product including an instruction method, which is implemented in the process Figure 1 A process or multiple processes and / or boxes Figure 1A function specified in one or more boxes.

[0094] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0095] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A design method for hot air electric heating defrosting solution for polar ship cab glass, characterized in that: The following steps are involved: Obtain the ship's wheelhouse clear height, bulkhead inclination, wheelhouse glass height and wheelhouse glass length; Determine the minimum frost air volume required for the glass according to the height of the cab glass and the length of the cab glass, determine the number of air vents required for the glass and the air vent spacing according to the length of the cab glass, and determine the average wind speed of a single air vent that meets the minimum frost air volume requirement according to the minimum frost air volume and the number of air vents required for the glass; Determine the recommended air outlet angle according to the optimal impact angle and the bulkhead inclination angle, calculate the jet distance from the air outlet to the jet geometric impact point in combination with the clear height of the cab, and determine the single air outlet wind speed that meets the impact point speed requirement according to the jet distance; Compare the single air outlet average wind speed with the single air outlet wind speed, and take the larger value of the two as the minimum value of the air supply speed of the hot air defrosting system air outlet; Determine the minimum value of the single air outlet air supply volume and the minimum value of the total air supply volume according to the minimum value of the air outlet air supply speed of the hot air defrosting system, the preset air outlet diameter, and the number of air outlets required for the glass; The air outlet is selected based on the minimum air supply volume of a single air outlet, and the fan is selected based on the minimum total air supply volume.

2. The hot wind electric heating defrosting scheme design method for polar ship cab glass according to claim 1 is characterized in that: The minimized frost air volume is Q F =0.015l·b, where Q F To minimize the amount of frost, l is the length of the cab glass and b is the width of the cab glass.

3. The hot wind electric heating defrosting scheme design method for polar ship cab glass according to claim 1 is characterized in that: The number of air vents and the air vent spacing required for the glass are calculated based on the length of the cab glass through a performance mode formula or an economic mode formula.

4. The hot wind electric heating defrosting scheme design method for polar ship cab glass according to claim 1 is characterized in that: The average wind speed of the single air outlet is Calculated, where v 0Q is the average wind speed at a single outlet, Q F To minimize the frost air volume, D is the set air outlet diameter and n is the number of air outlets required for the glass.

5. The hot wind electric heating defrosting scheme design method for polar ship cab glass according to claim 1 is characterized in that: The jet distance is Calculated, where H is the jet distance, h Net is the net height of the cab, h eyes is the sight height of people, θ is the recommended air supply angle of the tuyere, expressed as: θ = α-β, α is the optimal impact angle, β is the inclination angle of the bulkhead.

6. The hot wind electric heating defrosting scheme design method for polar ship cab glass according to claim 1 is characterized in that: The single tuyere wind speed is Calculated, where v 0H is the wind speed of a single tuyere, H is the jet distance, and D is the set tuyere diameter.

7. The hot wind electric heating defrosting scheme design method for polar ship cab glass according to claim 1 is characterized in that: The method further includes determining the front-to-back arrangement distance of the air outlet according to the recommended air outlet air supply angle and the clear height of the cab, wherein the front-to-back arrangement distance of the air outlet is calculated by L=(h Net -h eyes )(tanθ+tanβ) is calculated, where L is the distance between the front and rear of the tuyere, h Net is the net height of the cab, h eyes is the sight height of people, θ is the recommended air supply angle of the tuyere, and β is the inclination angle of the bulkhead.

8. The hot wind electric heating defrosting scheme design method for polar ship cab glass according to claim 1 is characterized in that: The minimum air volume of a single air outlet is Q0 = 900π·D 2 v0 is calculated, and the minimum total air supply volume is obtained by Q = 900π·D 2 (n·v0) is calculated, where Q0 is the minimum air supply volume of a single air outlet, Q is the minimum total air supply volume, D is the set air outlet diameter, v0 is the minimum air supply speed of the hot air defrosting system air outlet, and n is the number of air outlets required for the glass.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the steps of the method for designing a hot wind electric heating defrosting solution for the glass of the polar ship's wheelhouse are implemented as described in any one of claims 1-8.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method for designing a hot wind electric heating defrosting solution for the glass of a polar ship's wheelhouse are implemented as described in any one of claims 1 to 8.

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