CN113193423B - Method and system for improving heat dissipation of cable joint - Google Patents
Method and system for improving heat dissipation of cable joint Download PDFInfo
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- CN113193423B CN113193423B CN202110379517.6A CN202110379517A CN113193423B CN 113193423 B CN113193423 B CN 113193423B CN 202110379517 A CN202110379517 A CN 202110379517A CN 113193423 B CN113193423 B CN 113193423B
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- 230000017525 heat dissipation Effects 0.000 title claims abstract description 91
- 238000000034 method Methods 0.000 title claims abstract description 30
- 239000004020 conductor Substances 0.000 claims abstract description 30
- 230000001965 increasing effect Effects 0.000 claims abstract description 21
- 238000012546 transfer Methods 0.000 claims description 11
- 238000004891 communication Methods 0.000 claims description 5
- 230000002708 enhancing effect Effects 0.000 claims description 4
- 238000004088 simulation Methods 0.000 claims description 4
- 230000001133 acceleration Effects 0.000 claims description 3
- 238000004422 calculation algorithm Methods 0.000 claims description 3
- 238000004364 calculation method Methods 0.000 claims 2
- 230000000694 effects Effects 0.000 description 17
- 230000020169 heat generation Effects 0.000 description 7
- 239000000463 material Substances 0.000 description 6
- 238000007664 blowing Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 238000010304 firing Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/46—Bases; Cases
- H01R13/533—Bases, cases made for use in extreme conditions, e.g. high temperature, radiation, vibration, corrosive environment, pressure
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20009—Modifications to facilitate cooling, ventilating, or heating using a gaseous coolant in electronic enclosures
- H05K7/20136—Forced ventilation, e.g. by fans
Abstract
The invention discloses a method and a system for improving heat dissipation of a cable joint. The system comprises: the cable connector, the cable body and the heat dissipation equipment are arranged in the cable body, and the cable body is adjacent to at least one end of the cable connector; the heat dissipating device is capable of outputting a wind force having a set wind speed and causing the wind force to act on a surface of the cable body for increasing an axial heat flow between the cable joint and the cable body. According to the invention, the wind power output by the heat dissipation device directly acts on the surface of the cable body adjacent to the cable joint, so that the heat dissipation environment of the surface of the cable body can be improved, the heat dissipation of the cable body is enhanced, the conductor temperature of the cable body is further reduced, the axial heat flow between the cable joint and the cable body is increased, and the purpose of improving the heat dissipation efficiency of the cable joint is finally achieved.
Description
Technical Field
The invention relates to the technical field of cable connectors, in particular to a method and a system for improving heat dissipation of a cable connector.
Background
As the power demand increases, the load on the line also increases. Under the same surrounding environment, the cable joint has poor heat dissipation effect due to large volume, and becomes a hot spot position in the circuit and a weak spot in the circuit. The overheat operation can accelerate the ageing of the main insulation of the cable joint, shorten the service life of the cable joint, increase the breakdown fault probability of the cable joint and threaten the safe and stable operation of the circuit. When the cable joint is overheated seriously, accidents such as fire explosion and the like can be caused, and irreversible loss is caused.
At the same time, temperature is a key factor limiting the current-carrying capacity improvement of the cable line. Compared with the cable body, the temperature of the cable joint is higher, and the temperature is a bottleneck point for limiting the current-carrying capacity. The related measures are put forward to reduce the conductor temperature of the cable joint and have important significance for improving the current-carrying capacity of the circuit.
The prior heat dissipation improvement of the cable joint mainly comprises the following three aspects:
the first aspect is achieved by reducing the additional heat generation inside the cable joint, for example by reducing the contact resistance of the crimp tube from the point of installation process to reduce the additional heat generation of the crimp tube. But under the condition that the heat generation amount in the cable joint is the same, the heat dissipation effect of the cable joint can be further improved from improving the external condition.
The second aspect is achieved by improving radial heat dissipation of the cable joint, for example by improving the cabling environment to increase the heat dissipation of the cable, or by replacing the inner filler material of the cable joint with a filler material of high thermal conductivity. But because the cable joint is thick in insulation and huge in volume, the radial heat dissipation effect of the cable joint is improved, and the heat dissipation effect of the inside of the cable joint is poor.
The third aspect is realized by blowing cold air to the cable joint, and the scheme changes heat away through a cold air action environment. The scheme is equivalent to changing the environment for the cable joint, but because the cable joint is large in size and thick in insulation, the difference between the surface temperature and the environmental temperature difference is small, the heat dissipation effect of improving the surrounding environmental temperature to the inside of the cable joint is poor, the cost of the method is high (both the structural design cost and the use cost are high), and the brought economic benefit is small.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the invention provides a method and a system for improving heat dissipation of a cable joint, which can realize better heat dissipation effect and lower utilized cost.
In a first aspect of the present invention, a method for enhancing heat dissipation of a cable joint is provided, comprising the steps of:
the wind power with set wind speed is output through the heat dissipation device to act on the surface of the cable body adjacent to at least one end of the cable joint, so that heat dissipation of the cable body is enhanced, and the axial heat flow between the cable joint and the cable body is further increased.
According to the embodiment of the invention, at least the following technical effects are achieved:
the wind power output by the heat dissipation device directly acts on the surface of the cable body adjacent to the cable joint, so that the heat dissipation environment of the surface of the cable body can be improved, the heat dissipation of the cable body is enhanced, the conductor temperature of the cable body is further reduced, the axial heat flow between the cable joint and the cable body is increased, and the purpose of improving the heat dissipation efficiency of the cable joint is finally achieved.
Compared with the implementation method for reducing the additional heat generation in the cable joint, the method can be used for further improving the heat dissipation of the cable joint and further improving the current-carrying capacity of the circuit.
Compared with the method for realizing radial heat dissipation through improving the cable joint, the method improves the heat dissipation environment of the cable body through the auxiliary heat dissipation equipment, so that the axial heat flow between the cable joint and the adjacent body is increased, the realized heat dissipation effect is better, and the utilized cost is lower.
Compared with the existing implementation scheme of blowing cold air to the cable joint, the method starts from different heat dissipation principles of the cable joint, improves the heat dissipation environment of the cable body through auxiliary heat dissipation equipment, so that axial heat flow between the cable joint and the adjacent body is increased instead of acting on the cable joint, and the heat dissipation effect achieved by the method is better.
In a second aspect of the present invention, there is provided a system for enhancing heat dissipation of a cable joint, comprising:
a cable joint;
a cable body adjacent to at least one end of the cable joint;
the heat dissipation device is capable of outputting wind power with a set wind speed and enabling the wind power to act on the surface of the cable body for increasing axial heat flow between the cable joint and the cable body.
According to the embodiment of the invention, at least the following technical effects are achieved:
the wind power output by the heat dissipation device directly acts on the surface of the cable body adjacent to the cable joint, so that the heat dissipation environment of the surface of the cable body can be improved, the heat dissipation of the cable body is enhanced, the conductor temperature of the cable body is further reduced, the axial heat flow between the cable joint and the cable body is increased, and the purpose of improving the heat dissipation efficiency of the cable joint is finally achieved.
Compared with the implementation method by reducing the additional heat generation in the cable joint, the system can be used for further improving the heat dissipation of the cable joint and further improving the current-carrying capacity of the circuit. .
Compared with the implementation method for radial heat dissipation through improving the cable joint, the system improves the heat dissipation environment of the cable body through the auxiliary heat dissipation equipment, so that the axial heat flow between the cable joint and the adjacent body is increased, the implemented heat dissipation effect is better, and the utilized cost is lower.
Compared with the prior implementation scheme of blowing cold air to the cable joint, the system starts from different heat dissipation principles of the cable joint, improves the heat dissipation environment of the cable body through auxiliary heat dissipation equipment, so that the axial heat flow between the cable joint and the adjacent body is increased, and the heat dissipation effect realized by the system is better instead of acting on the cable joint.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
fig. 1 is a schematic flow chart of a method for improving heat dissipation of a cable joint according to an embodiment of the present invention;
FIG. 2 is a front view of the fan, the cable connector and the cable body according to the embodiment of the present invention;
FIG. 3 is a top view of a fan and cable connector and cable body according to an embodiment of the present invention;
FIG. 4 is a left side view of the positional relationship between a fan, a cable joint and a cable body according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a distribution relationship between wind speed and conductor temperature according to an embodiment of the present invention;
description of the reference numerals:
1. a fan; 2. a cable joint; 3. a cable body.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
A first embodiment;
referring to fig. 1, a method for improving heat dissipation of a cable joint is provided, including the following steps:
s100, outputting wind power with set wind speed through the heat dissipation device to act on the surface of the cable body adjacent to at least one end of the cable joint, and increasing axial heat flow between the cable joint and the cable body.
The wind power output by the heat dissipation device directly acts on the surface of the cable body adjacent to the cable joint (except special statement, the adjacency is equal to contact), so that the heat dissipation environment of the surface of the cable body can be improved, the heat dissipation of the cable body is enhanced, the conductor temperature of the cable body is further reduced, the axial heat flow between the cable joint and the cable body is increased, and finally the purpose of improving the heat dissipation efficiency of the cable joint is achieved.
The method is based on the following principle:
the heat generated by the cable joint is radiated to the surrounding environment along the radial direction and the axial direction, wherein the heat radiated along the radial direction passes through each layer of structure of the cable joint and finally radiated to the environment; the heat dissipated in the axial direction is conducted from the side with high temperature to the side with low temperature through a hot good conductor such as a cable conductor. It is known from the theory of thermal paths that the heat flow is proportional to the temperature difference, so that the wind power output by the heat dissipating device acts on the surface of the cable body, and the increase of the temperature difference between the cable joint and the conductor of the body (the body is referred to herein as the cable body unless specifically stated) increases the axial heat flow between the cable joint and the conductor, so that more heat inside the cable joint is conducted and dissipated along the conductor from the axial direction. Because the cable joint has a complex structure, the heat exchange mode between the surface of the cable joint and the surrounding environment is almost unchanged, so that the part of the internal heat of the cable joint, which is conducted along the radial direction, is almost identical with the original mode. The total amount of heat emitted is equal to the sum of the amount of heat emitted in the radial direction and the amount of heat emitted in the axial direction, and the amount of heat emitted in the radial direction is almost constant based on the above-described increase in the amount of heat emitted in the axial direction, so that the total amount of heat emitted increases. According to the law of conservation of energy, the amount of heat generated is equal to the sum of the amount of heat dissipated and the internal energy of the component, which is the energy consumed to maintain the temperature of the cable joint conductors, so that, with the same amount of heat generated, an increase in the amount of heat dissipated results in a decrease in the internal energy of the component, with a consequent decrease in the temperature of the cable joint conductors.
The method has the advantages that:
compared with the implementation method of reducing the additional heat generation inside the cable joint (for example, reducing the contact resistance of the crimping pipe), the method can further improve the heat dissipation of the cable joint on the basis of the method and further improve the current carrying capacity of the circuit.
Compared with the method for realizing radial heat dissipation of the cable joint by improving the radial heat dissipation of the cable joint (for example, the inner filling material of the cable joint is replaced by the high-heat-conductivity filling material), the method improves the heat dissipation environment of the cable body by the auxiliary heat dissipation equipment, so that the axial heat flow between the cable joint and the adjacent body is increased, the realized heat dissipation effect is better, and the utilized cost is lower.
Compared with the existing implementation scheme of blowing cold air to the cable joint, the method starts from different heat dissipation principles of the cable joint, improves the heat dissipation environment of the cable body through auxiliary heat dissipation equipment, so that axial heat flow between the cable joint and the adjacent body is increased instead of acting on the cable joint, and the heat dissipation effect achieved by the method is better.
The following details the implementation procedure of step S100:
as an alternative embodiment, the heat dissipating device is preferably a fan, and the heat dissipating device may be an air conditioner capable of blowing cool air at a set wind speed, but the overall cost of the fan is lower.
The first step is to add a fan near the cable body adjacent to the cable joint, the fan is arranged on one side of the cable body, and the wind direction is perpendicular to the cable laying direction.
As shown in fig. 2 to fig. 4, it should be noted that, as an example, only 2 fans are shown in fig. 2, the number of fans and the distance between the fans and the cable body may be set according to practical situations, for example, when the types of the cable joints are different, or when the environments in the cable tunnels in which the cable joints are located are different, the number of fans and the distance between the fans and the cable body may be determined according to practical situations. In addition, although the fan may be added only in the vicinity of the cable body adjacent to one end of the cable joint, the heat dissipation may be greatly improved by adding the fan in the vicinity of the cable body adjacent to both ends of the cable joint, and the size of the fan may be set as appropriate, compared with adding the fan in the vicinity of the cable body adjacent to one end of the cable joint, due to the symmetry of the cable body.
And secondly, starting the fan, and improving the heat dissipation environment of the surface of the cable body acted by the fan.
Compared with the fan which is not started, after the fan is started, the heat dissipation of the cable body is enhanced, the temperature of the conductor is reduced, and at the moment, the difference between the conductor temperature of the cable joint and the conductor temperature of the cable body is increased.
The increase in the temperature difference between the cable joint and the conductor of the body increases the axial heat flow between the two, and more heat inside the cable joint is dissipated from the axial direction along the conductor.
The heat exchange mode between the surface of the cable joint and the surrounding environment is almost unchanged, so that the part of the internal heat of the cable joint, which is conducted along the radial direction, is almost identical to the original mode.
The total amount of heat emitted is equal to the sum of the amount of heat emitted in the radial direction and the amount of heat emitted in the axial direction, and the amount of heat emitted in the radial direction is almost constant based on the above-described increase in the amount of heat emitted in the axial direction, so that the total amount of heat emitted increases.
According to the law of conservation of energy, the amount of heat generated is equal to the sum of the amount of heat dissipated and the internal energy of the component. The internal energy of a component refers to the energy consumed to maintain the temperature of the cable connector conductors. Thus, with the same amount of heat generation, an increase in the amount of heat dissipation results in a decrease in the internal energy of the component and a consequent decrease in the temperature of the cable joint conductors.
As an alternative embodiment, the wind speed set in step S100 may be adjusted. Preferably, the heat dissipation device establishes communication connection with a mobile terminal, so that the mobile terminal controls the heat dissipation device to adjust the set wind speed. Because the environment in the cable tunnel is complicated, the purpose of this design is in order to be convenient for the managers to realize the long-range operation of opening and closing to the firing equipment and to carry out remote control to the wind speed that the firing equipment blows out.
A second embodiment;
to facilitate understanding of the inventive concept by those skilled in the art, the cross section is 630mm at 110kV 2 For example, the temperature improvement effect of the cable connector after the fan is added is illustrated by simulation.
When the fan is not started, the heat exchange mode between the cable connector and the body and the surface mainly adopts natural convection heat exchange; when the fan is started, the heat dissipation mode of the body part adjacent to the cable joint is changed from natural convection heat exchange to forced convection heat exchange. The main action object of the fan is a cable body, so that the influence on the surface of the cable joint is small, and the heat exchange mode of the cable joint and the environment is mainly natural convection heat exchange.
The convective heat transfer coefficient h is calculated as follows:
wherein N is u Denotes a noose number, λ denotes a thermal conductivity coefficient, and l denotes a characteristic length. In natural convection heat exchange, the Knoop number is represented by Rayleigh number R shown in formula (2) a And (3) calculating to obtain:
wherein g represents gravitational acceleration, alpha v Let Δt be the difference between the surface temperature and the ambient temperature, α be the thermal diffusivity, and v be the kinematic viscosity.
In forced convection heat exchange, the noose number is calculated from the reynolds number shown in formula (4):
N u ＝CRe n Pr 1/3 (4)
wherein v is s The velocity, v, and Re represent the kinematic viscosity and Reynolds number.
And obtaining the convective heat transfer coefficient of the cable joint and the body based on the convective heat transfer coefficient algorithm. The conductor temperature distribution of the cable joint and the conductor temperature distribution of the cable joint body are shown in fig. 5 under different wind speeds obtained through simulation, when the wind speed is higher, the heat dissipation efficiency is better, and when the wind speed reaches a set threshold value, the heat dissipation efficiency is not obviously improved any more; the closer the fan is to the cable body, the better the effect. Therefore, the effect of obviously reducing the temperature of the conductor of the cable connector is improved by adding the fan.
A third embodiment;
the embodiment provides a system for improving heat dissipation of a cable joint, which comprises: the cable connector, the cable body and the heat dissipation equipment, wherein the cable body is adjacent to at least one end of the cable connector; the heat dissipating device is capable of outputting a wind force having a set wind speed and causing the wind force to act on a surface of the cable body for increasing an axial heat flow between the cable joint and the cable body.
The wind power output by the heat dissipation device directly acts on the surface of the cable body adjacent to the cable joint, so that the heat dissipation environment of the surface of the cable body can be improved, the heat dissipation of the cable body is enhanced, the conductor temperature of the cable body is further reduced, the axial heat flow between the cable joint and the cable body is increased, and the purpose of improving the heat dissipation efficiency of the cable joint is finally achieved.
It should be noted that, since the present embodiment is the same inventive concept as the first embodiment, the principle part can be referred to the first embodiment, and the description thereof is omitted herein.
As an alternative embodiment, the heat dissipating device is a fan, the fan is disposed on one side of the cable body, and the wind power output by the output end of the fan is aligned to the surface of the cable body. The fan is low cost and easy to place in the cable tunnel.
As an alternative embodiment, the system further comprises a mobile terminal, wherein the mobile terminal is in communication connection with the fan and is used for controlling and adjusting the output wind speed of the output end of the fan. The purpose of this design is in order to be convenient for the managers to realize the long-range operation of opening and closing to the firing equipment, carries out remote control to the wind speed that the firing equipment blows out.
In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.
Claims (2)
1. A method of enhancing heat dissipation in a cable joint comprising the steps of:
outputting wind power with set wind speed to act on the surface of the cable body adjacent to at least one end of the cable joint through the heat dissipation device, and increasing axial heat flow between the cable joint and the cable body; the wind force acts on the surface of the cable body adjacent to both ends of the cable joint; the heat dissipation device is a fan, and wind power output by the output end of the fan is aligned to the surface of the cable body adjacent to both ends of the cable joint; the fan is arranged on one side of the cable body adjacent to both ends of the cable joint; the wind power is applied to the cable body from the head end of the cable body to a certain length along the axial direction, and the head end of the cable body is the end adjacent to the cable joint; the set wind speed can be adjusted; the heat dissipation device is in communication connection with a mobile terminal, so that the mobile terminal controls the heat dissipation device to adjust the set wind speed; the increase of the axial heat flow between the cable connector and the cable body is achieved by the following method:
radiating heat generated by the cable joint into the surrounding environment along radial and axial directions by the fan, wherein the conductor temperature difference between the cable joint and the cable body is increased; wherein the first heat emitted along the radial direction passes through each layer of structure of the cable joint and is emitted to the surrounding environment; the second heat emitted along the axial direction is conducted from the side with high temperature to the side with low temperature through the good conductor with heat;
an increase in the conductor temperature differential of the cable joint and the cable body increases the axial heat flow; the calculation of the convective heat transfer coefficient h of the axial heat flow is shown as the following formula:
wherein N is u Represents the number of noose, λ represents the thermal conductivity coefficient, and l represents the characteristic length;
during natural convection heat exchange, the Knoop number is represented by Rayleigh number R a And (3) calculating to obtain:
wherein g represents gravitational acceleration, alpha v Represents the gas expansion coefficient, Δt represents the difference between the surface temperature and the ambient temperature, α represents the thermal diffusivity, and v represents the kinematic viscosity;
during forced convection heat exchange, the Knoop number is calculated by the Reynolds number:
N u ＝CRe n Pr 1/3
wherein v is s The velocity, v, kinematic viscosity, and Re Reynolds number;
based on the algorithm of the convection heat transfer coefficient, the convection heat transfer coefficient of the cable connector and the main body is obtained, different wind speeds corresponding to the convection heat transfer coefficient are obtained through simulation, and the fan is adjusted according to the different wind speeds.
2. A system for enhancing heat dissipation of a cable joint, comprising:
a cable joint;
a cable body adjacent to at least one end of the cable joint;
a heat dissipating device capable of outputting a wind force having a set wind speed and causing the wind force to act on a surface of the cable body for increasing an axial heat flow between the cable joint and the cable body; the heat dissipation device is a fan, the fan is arranged on one side of the cable body, and the wind power output by the output end of the fan is aligned to the surface of the cable body; the fan is arranged on one side of the cable body adjacent to both ends of the cable joint; the wind power is applied to the cable body from the head end of the cable body to a certain length along the axial direction, and the head end of the cable body is the end adjacent to the cable joint; the set wind speed can be adjusted; the heat dissipation device is in communication connection with a mobile terminal, so that the mobile terminal controls the heat dissipation device to adjust the set wind speed; the increase of the axial heat flow between the cable connector and the cable body is achieved by the following method:
radiating heat generated by the cable joint into the surrounding environment along radial and axial directions by the fan, wherein the conductor temperature difference between the cable joint and the cable body is increased; wherein the first heat emitted along the radial direction passes through each layer of structure of the cable joint and is emitted to the surrounding environment; the second heat emitted along the axial direction is conducted from the side with high temperature to the side with low temperature through the good conductor with heat; an increase in the conductor temperature differential of the cable joint and the cable body increases the axial heat flow; the calculation of the convective heat transfer coefficient h of the axial heat flow is shown as the following formula:
wherein N is u Represents the number of noose, λ represents the thermal conductivity coefficient, and l represents the characteristic length;
during natural convection heat exchange, the Knoop number is represented by Rayleigh number R a And (3) calculating to obtain:
wherein g represents gravitational acceleration, alpha v Represents the gas expansion coefficient, Δt represents the difference between the surface temperature and the ambient temperature, α represents the thermal diffusivity, and v represents the kinematic viscosity;
during forced convection heat exchange, the Knoop number is calculated by the Reynolds number:
N u ＝CRe n Pr 1/3
wherein v is s The velocity, v, kinematic viscosity, and Re Reynolds number;
based on the algorithm of the convection heat transfer coefficient, the convection heat transfer coefficient of the cable connector and the main body is obtained, different wind speeds corresponding to the convection heat transfer coefficient are obtained through simulation, and the fan is adjusted according to the different wind speeds;
and the mobile terminal is in communication connection with the fan and is used for controlling and adjusting the output wind speed of the output end of the fan.
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| CN209981969U (en) * | 2019-08-01 | 2020-01-21 | 成都龙瀛电力电子实业有限公司 | American high tension cable distribution box convenient to maintain |
| CN211699815U (en) * | 2019-12-23 | 2020-10-16 | 南通市鹏程电缆有限公司 | Radiating wire and cable |
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| CN113193423A (en) | 2021-07-30 |
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