Electrical room ventilation opening arrangement optimization method

Abstract

The invention discloses an electrical room ventilation opening arrangement optimization method, which comprises the steps of determining the optimal position of a ventilation opening of an existing electrical equipment room through Fluent software simulation, and counting each numerical value of the optimal position, including room volume, total equipment heat dissipation capacity, room air supply capacity, area size of an air supply outlet and the number of the air supply outlets; constructing and training a neural network model, taking each counted numerical value as the input of a neural network, and taking the optimal position of the ventilation opening as the output; calculating the air supply amount and the number of air supply outlets required by the electrical equipment room to be designed, determining the optimal position of the ventilation opening of the electrical equipment room to be designed through the trained neural network model, and finally verifying whether the result meets the requirement or not through Fluent software simulation. According to the method, the number of the ventilation openings required by the electrical equipment room can be reasonably calculated, the neural network is introduced, the positions of the ventilation openings are optimized, and the design efficiency of the electrical equipment room is improved.

Description

Technical Field

[0001] The invention relates to a ventilation system optimization method, and in particular to a ventilation opening layout optimization method for an electrical room. Background Art

[0002] The electrical equipment room of the oil and gas module usually adopts the method of up and down ventilation. The vents include air supply vents and exhaust vents. The number of air supply vents is the same as the number of exhaust vents. The air supply vents are arranged on the ground and the exhaust vents are arranged on the top of the room. There are many devices in the electrical equipment room, and the heat dissipation of the equipment is large. Often due to the unreasonable number and position of the vents, the room is partially overheated. Although the physical model of the room can be established through Fluent fluid simulation software, the air flow in the room can be simulated, the temperature field in the room can be obtained, and the vent layout can be optimized, it is relatively cumbersome to constantly change the number and position of the vents for simulation testing. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a method for optimizing the layout of ventilation openings in an electrical room. The method can reasonably calculate the number of ventilation openings required in an electrical equipment room, quickly determine the optimal location of the ventilation openings, and improve the design efficiency of the electrical equipment room.

[0004] To achieve the above object, the technical solution adopted by the present invention is:

[0005] A method for optimizing the layout of electrical room vents of the present invention comprises the following steps:

[0006] Step 1: Use Fluent software to determine the optimal location of the existing electrical equipment room vents. The specific steps are as follows:

[0007] The first step is to establish a simulation model of the existing electrical equipment room and the equipment therein in the Fluent software, with the lower left corner of the simulation model as the origin O, the height direction of the simulation model as the positive direction of the Z axis, the width direction of the simulation model as the positive direction of the X axis, and the length direction of the simulation model as the positive direction of the Y axis. The coordinate system of the simulation model is established, and the main equipment is simplified into a rectangular parallelepiped to establish a simulation model to simulate the airflow and temperature field of the existing electrical equipment room;

[0008] The second step is to continuously change the positions of the air supply and exhaust vents in the simulation model. After each position change, re-simulate the air flow and temperature field between the existing electrical equipment. After the air flow and temperature field are stable, calculate and record the highest temperature t in the temperature field. max The difference Δt from the room design temperature t:

[0009] Δt=t max -t

[0010] When Δt is the smallest, the positions of the air supply and exhaust outlets at this time are the optimal positions of the vents of the simulation model. The coordinates of the center points of the air supply and exhaust outlets in the coordinate system of the simulation model are recorded to indicate the optimal positions of the center points of the air supply and exhaust outlets.

[0011] Step 2: Repeat step 1 for all existing electrical equipment rooms and record the center point coordinates of the optimal air outlet position in the coordinate system of the simulation model. Coordinates of the center point of the exhaust vent at the optimal position And count the various values ​​of all existing electrical equipment rooms, including the room volume a i , total equipment heat dissipation b i , room air volume c i , the area of ​​the air outlet is d i , number of air outlets i (i=1,2,…,m), m is the number of all existing electrical equipment rooms, the air supply and exhaust vents have the same area, and the number of air supply and exhaust vents is equal;

[0012] Step 3: Build a neural network model in Python, use the values ​​of all existing electrical equipment counted in step 2 as the input of the neural network, and the center point coordinates of the optimal position of the air supply and exhaust vents As the output of the neural network, train the neural network model;

[0013] Step 4: Calculate the required air volume L for an electrical equipment room to be designed with the goal of eliminating the heat dissipation of the equipment. The calculation formula for the required air volume L for the electrical equipment room to be designed is as follows:

[0014]

[0015] Where L is the required air volume, m 3 / h; Q is the total equipment heat dissipation, which is the sum of the heat dissipation of each device in the electrical equipment room to be designed, kW; t 1 is the indoor exhaust design temperature, ℃; t 2 is the air supply design temperature, ℃; c is the specific heat of air, usually 1.01, kJ / (kg·℃); ρ is the air density, kg / m 3 ;

[0016] Step 5: Calculate the number of air outlets required for the electrical equipment room to be designed. The number of exhaust outlets required is equal to the calculated number of air outlets n. The calculation formula is as follows:

[0017]

[0018] In the formula, n is the number of air outlets required; Indicates rounding up; L is the air volume calculated in step 4, m 3 / h; M is the area of ​​the air outlet selected in advance, m 2 ; v is the wind speed at the air outlet;

[0019] Step 6: Input the room volume of the electrical equipment room to be designed, the total equipment heat dissipation Q described in step 4, the ventilation volume L calculated in step 4, the area M of the air outlet pre-selected in step 5, and the number n of air outlets calculated in step 5 into the neural network trained in step 3 to obtain the center point coordinates (x 1 ,y 1 ,z 1 ), the center coordinates of the exhaust outlet at the optimal position (x 2 ,y 2 ,z 2 );

[0020] Step 7. In Fluent software, establish a simulation model of the electrical equipment room to be designed; similarly, take the upper left corner of the simulation model as the origin O, the height direction of the simulation model as the positive direction of the Z axis, the width direction of the simulation model as the positive direction of the X axis, and the length direction of the simulation model as the positive direction of the Y axis to establish the coordinate system of the simulation model, and simplify the main equipment into a cuboid, with the center point coordinates (x 1 ,y 1 ,z 1 )、(x 2 ,y 2 ,z 2 ) Set the positions of the air supply and exhaust vents. If the number of air supply vents n calculated in step five is greater than 1, arrange the air supply and exhaust vents along the Y-axis direction; after completing the establishment of the simulation model, simulate the air flow and temperature field between the electrical equipment; after the air flow and temperature field are stable, calculate the difference Δt' between the maximum temperature in the temperature field and the design temperature of the room. If it is less than the set threshold, the vent arrangement optimization is completed, and the actual electrical equipment is arranged according to the position and number of the air supply and exhaust vents in the simulation model; if it is greater than the set threshold, repeat step six, change the position of the air supply and exhaust vents in the simulation model in this step according to the newly obtained optimal position of the air supply and exhaust vents, re-simulate the air flow and temperature field, until the difference between the maximum temperature in the temperature field and the design temperature of the room is less than the set threshold, then the optimization is completed.

[0021] Compared with the prior art, the advantages of the present invention are:

[0022] The present invention can reasonably calculate the number of vents required in the electrical equipment room, introduce a neural network, optimize the positions of the vents, and improve the design efficiency of the electrical equipment room. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the simulation model of the electrical equipment room of the present invention.

[0024] Figure 2 It is a schematic diagram of the center point of the ventilation opening in the electrical equipment room of the present invention. DETAILED DESCRIPTION

[0025] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] The electrical equipment room of the oil and gas module usually adopts the method of top and bottom ventilation. The ventilation holes include air supply holes and exhaust holes. The number of air supply holes is equal to the number of exhaust holes. The area of ​​air supply holes is equal to the area of ​​exhaust holes. The air supply holes are arranged on the ground and the exhaust holes are arranged on the top of the room.

[0027] As shown in the accompanying drawings, a method for optimizing the layout of electrical room vents of the present invention comprises the following steps:

[0028] Step 1: Use Fluent software to determine the optimal location of the existing electrical equipment room vents. The specific steps are as follows:

[0029] The first step is to build a simulation model of the existing electrical equipment room and the equipment in it in Fluent software. Figure 1 As shown, with the lower left corner of the simulation model as the origin O, the height direction of the simulation model as the positive direction of the Z axis, the width direction of the simulation model as the positive direction of the X axis, and the length direction of the simulation model as the positive direction of the Y axis, a coordinate system of the simulation model is established, and the main equipment is simplified into a rectangular parallelepiped to establish a simulation model to simulate the airflow and temperature field between existing electrical equipment.

[0030] The second step is to continuously change the positions of the air supply and exhaust vents in the simulation model. After each position change, re-simulate the air flow and temperature field between the existing electrical equipment. After the air flow and temperature field are stable, calculate and record the highest temperature t in the temperature field. max The difference Δt from the room design temperature t:

[0031] Δt=t max -t

[0032] The position change of the air supply and exhaust vents can be arranged according to the ventilation vent position layout principle of "Design Code for Heating, Ventilation and Air Conditioning of Industrial Buildings" GB50019-2015; when Δt is the smallest, the position of the air supply and exhaust vents at this time is the optimal position of the vents of the simulation model, such as Figure 2As shown, the coordinates of the center points of the air supply outlet and the air exhaust outlet in the coordinate system of the simulation model are recorded at this time, indicating the optimal positions of the center points of the air supply outlet and the air exhaust outlet.

[0033] Step 2: Repeat step 1 for all existing electrical equipment rooms and record the center point coordinates of the optimal air outlet position in the coordinate system of the simulation model. Coordinates of the center point of the exhaust vent at the optimal position And count the various values ​​of all existing electrical equipment rooms, including the room volume a i , total equipment heat dissipation b i , room air volume c i , the area of ​​the air outlet is d i Since the area of ​​the air supply outlet is equal to that of the air exhaust outlet, we only need to count the area of ​​the air supply outlet. The number of air supply outlets is e i (i=1,2,…,m), since the number of air supply vents is equal to the number of air exhaust vents, only the number of air supply vents needs to be counted, and m is the number of all existing electrical equipment rooms.

[0034] Step 3: Build a neural network model in Python, use the values ​​of all existing electrical equipment counted in step 2 as the input of the neural network, and the center point coordinates of the optimal position of the air supply and exhaust vents As the output of the neural network, a neural network model is trained to quickly determine the location of the ventilation holes in the electrical equipment room to be designed.

[0035] Step 4: Calculate the required air volume L for an electrical equipment room to be designed with the goal of eliminating the heat dissipation of the equipment. The calculation formula for the required air volume L for the electrical equipment room to be designed is as follows:

[0036]

[0037] Where L is the required air volume, m 3 / h; Q is the total equipment heat dissipation, which is the sum of the heat dissipation of each device in the electrical equipment room to be designed, kW; t 1 is the indoor exhaust design temperature, ℃; t 2 is the air supply design temperature, ℃; c is the specific heat of air, usually 1.01, kJ / (kg·℃); ρ is the air density, kg / m 3 ;

[0038] Step 5: Calculate the number of air outlets required for the electrical equipment room to be designed. The number of exhaust outlets required is equal to the calculated number of air outlets. The calculation formula is as follows:

[0039]

[0040] In the formula, n is the number of air outlets required; Indicates rounding up; L is the air volume calculated in step 4, m 3 / h; M is the area of ​​the air outlet selected in advance, m 2 ; v is the wind speed of the air supply outlet, m / s. The wind speed value can be obtained by looking up the "Design Code for Heating, Ventilation and Air Conditioning of Industrial Buildings" GB50019-2015; the required number of air supply outlets can be obtained by dividing the air supply volume by the wind speed of the air supply outlet and the selected air supply outlet area. The required number of air supply outlets and the required number of exhaust outlets are both n.

[0041] Step 6: Input the room volume of the electrical equipment room to be designed, the total equipment heat dissipation Q described in step 4, the ventilation volume L calculated in step 4, the area M of the air outlet pre-selected in step 5, and the number n of air outlets calculated in step 5 into the neural network trained in step 3 to obtain the center point coordinates (x 1 ,y 1 ,z 1 ), the center coordinates of the exhaust outlet at the optimal position (x 2 ,y 2 ,z 2 ).

[0042] Step 7. In Fluent software, establish a simulation model of the electrical equipment room to be designed. Similarly, take the upper left corner of the simulation model as the origin O, the height direction of the simulation model as the positive direction of the Z axis, the width direction of the simulation model as the positive direction of the X axis, and the length direction of the simulation model as the positive direction of the Y axis to establish the coordinate system of the simulation model, and simplify the main equipment into a rectangular parallelepiped, with the center point coordinates (x 1 ,y 1 ,z 1 )、(x 2 ,y 2 ,z 2) Set the position of the air supply and exhaust vents. If the number of air supply vents n calculated in step five is greater than 1, that is, the number of air supply vents and exhaust vents is more than 1, in order to maximize the space utilization, the air supply and exhaust vents should be arranged along the Y-axis direction. After the establishment of the simulation model is completed, the air flow and temperature field between the electrical equipment are simulated. After the air flow and temperature field are stable, the difference Δt' between the highest temperature in the temperature field and the design temperature of the room is calculated. If it is less than the set threshold, the vent layout optimization is completed, and the actual electrical equipment room is arranged according to the position and number of the air supply and exhaust vents in the simulation model. If it is greater than the set threshold, repeat step six, according to the newly obtained optimal position of the air supply and exhaust vents, change the position of the air supply and exhaust vents in the simulation model in this step, re-simulate the air flow and temperature field, until the difference between the highest temperature in the temperature field and the design temperature of the room is less than the set threshold, then the optimization is completed.

Claims

1. A method for optimizing the layout of ventilation openings in an electrical room, characterized in that The following steps are involved: Step 1: Use Fluent software to determine the optimal location of the existing electrical equipment room vents. The specific steps are as follows: The first step is to establish a simulation model of the existing electrical equipment room and the equipment therein in the Fluent software, with the lower left corner of the simulation model as the origin O, the height direction of the simulation model as the positive direction of the Z axis, the width direction of the simulation model as the positive direction of the X axis, and the length direction of the simulation model as the positive direction of the Y axis. The coordinate system of the simulation model is established, and the main equipment is simplified into a rectangular parallelepiped to establish a simulation model to simulate the airflow and temperature field of the existing electrical equipment room; The second step is to continuously change the positions of the air supply and exhaust vents in the simulation model. After each position change, re-simulate the air flow and temperature field between the existing electrical equipment. After the air flow and temperature field are stable, calculate and record the highest temperature t in the temperature field. max The difference Δt from the room design temperature t: Δt=t max -t When Δt is the smallest, the positions of the air supply and exhaust outlets at this time are the optimal positions of the vents of the simulation model. The coordinates of the center points of the air supply and exhaust outlets in the coordinate system of the simulation model are recorded to indicate the optimal positions of the center points of the air supply and exhaust outlets. Step 2: Repeat step 1 for all existing electrical equipment rooms and record the center point coordinates of the optimal air outlet position in the coordinate system of the simulation model. Coordinates of the center point of the exhaust vent at the optimal position And count the various values ​​of all existing electrical equipment rooms, including the room volume a i , total equipment heat dissipation b i , room air volume c i , the area of ​​the air outlet is d i , number of air outlets i (i=1,2,…,m), m is the number of all existing electrical equipment rooms, the air supply and exhaust vents have the same area, and the number of air supply and exhaust vents is the same; Step 3: Build a neural network model in Python, use the values ​​of all existing electrical equipment counted in step 2 as the input of the neural network, and the center point coordinates of the optimal positions of the air supply and exhaust vents As the output of the neural network, train the neural network model; Step 4: Calculate the required air volume L for an electrical equipment room to be designed with the goal of eliminating the heat dissipation of the equipment. The calculation formula for the required air volume L for the electrical equipment room to be designed is as follows: Where L is the required air volume, m 3 / h; Q is the total equipment heat dissipation, which is the sum of the heat dissipation of each device in the electrical equipment room to be designed, kW; t1 is the indoor exhaust design temperature, ℃; t2 is the supply air design temperature, ℃; c is the specific heat capacity of air, usually 1.01, kJ / (kg·℃); ρ is the air density, kg / m 3 ; Step 5: Calculate the number of air outlets required for the electrical equipment room to be designed. The number of exhaust outlets required is equal to the calculated number of air outlets n. The calculation formula is as follows: In the formula, n is the number of air outlets required; Indicates rounding up; L is the air volume calculated in step 4, m 3 / h; M is the area of ​​the air outlet selected in advance, m 2 ; v is the wind speed at the air outlet; Step 6: Input the room volume of the electrical equipment room to be designed, the total equipment heat dissipation Q described in step 4, the ventilation volume L calculated in step 4, the area M of the air outlet pre-selected in step 5, and the number n of air outlets calculated in step 5 into the neural network trained in step 3 to obtain the center point coordinates (x1, y1, z1) of the air outlet in the electrical equipment room at the optimal position and the center point coordinates (x2, y2, z2) of the air outlet in the optimal position; Step 7. In Fluent software, establish a simulation model of the electrical equipment room to be designed; similarly, take the upper left corner of the simulation model as the origin O, the height direction of the simulation model as the positive direction of the Z axis, the width direction of the simulation model as the positive direction of the X axis, and the length direction of the simulation model as the positive direction of the Y axis to establish the coordinate system of the simulation model, and simplify the main equipment into a rectangular parallelepiped, and set the positions of the air supply and exhaust outlets according to the center point coordinates (x1, y1, z1) and (x2, y2, z2) of the optimal position of the air supply and exhaust outlets of the electrical equipment room obtained in step 6. If the number of air supply outlets n calculated in step 5 is greater than 1, arrange the air supply and exhaust outlets along the Y axis. exhaust vent; after completing the establishment of the simulation model, simulate the air flow and temperature field between the electrical equipment; after the air flow and temperature field are stable, calculate the difference Δt' between the highest temperature in the temperature field and the design temperature of the room. If it is less than the set threshold, the vent layout optimization is completed, and the actual electrical equipment room is arranged according to the position and number of the air supply and exhaust vents in the simulation model; if it is greater than the set threshold, repeat step six, and change the position of the air supply and exhaust vents in the simulation model in this step according to the newly obtained optimal position of the air supply and exhaust vents, re-simulate the air flow and temperature field, until the difference between the highest temperature in the temperature field and the design temperature of the room is less than the set threshold, then the optimization is completed.

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