CN111753379B - A fan selection method for a DC charging pile system - Google Patents
A fan selection method for a DC charging pile system Download PDFInfo
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Abstract
本发明公开了一种直流充电桩系统的风扇选型方法，用于从多种类型的待选风扇中选择合适的类型风扇作为充电桩系统的系统风扇，方法包括：确定充电桩系统进行散热的系统所需风量；测试得到充电桩系统真实的风阻曲线；针对每一种类型的待选风扇，计算满足系统所需风量所需的风扇数量并测试对应数量的多个待选风扇并联后实际的风阻曲线；将每一种类型的待选风扇的风阻曲线与充电桩系统的风阻曲线进行交汇得到多个工作点；根据所述系统所需风量从各类风扇的多个工作点中选取出各类待选风扇对应的系统工作点；评估比对各类待选风扇的系统工作点，从中找到最佳的系统工作点，根据最佳的系统工作点确定风扇类型，如此可解决既有风扇选型方法的诸多问题。
The present invention discloses a fan selection method for a DC charging pile system, which is used for selecting a suitable type of fan from multiple types of fans to be selected as a system fan of the charging pile system. The method comprises: determining the required air volume for the system to dissipate heat of the charging pile system; testing to obtain a real wind resistance curve of the charging pile system; for each type of fan to be selected, calculating the number of fans required to meet the required air volume of the system and testing the actual wind resistance curve after a corresponding number of multiple fans to be selected are connected in parallel; intersecting the wind resistance curve of each type of fan to be selected with the wind resistance curve of the charging pile system to obtain multiple working points; selecting the system working point corresponding to each type of fan to be selected from the multiple working points of each type of fan according to the required air volume of the system; evaluating and comparing the system working points of each type of fan to be selected, finding the best system working point therefrom, and determining the fan type according to the best system working point, so as to solve many problems of the existing fan selection method.
Description
Technical Field
The invention relates to the field of charging piles, in particular to a fan type selection method of a direct current charging pile system.
Background
The existing fan type selection method is to determine the specification and number of fans by referring to the nominal static air quantity Qm and static air pressure Pm in the fan specification after knowing the air quantity required by system heat dissipation through deduction calculation or thermal simulation. The wind quantity Qm is the wind quantity corresponding to the wind pressure of the fan when the wind pressure is 0mmAq, the determined wind pressure Pm is the wind pressure corresponding to the wind pressure when the wind pressure is 0CFM, and the two values are not dynamic operation working points of the cooling fan when the system is in operation, if blind people consider that the two static values are larger and better, the fan type of the system deviates from the actual value, noise is increased, and cost is increased.
Disclosure of Invention
The invention aims to solve the technical problem of providing a fan type selection method of a direct current charging pile system aiming at the defects in the prior art.
The technical scheme adopted for solving the technical problems is as follows: a fan-type selection method for constructing a direct current charging pile system for selecting an appropriate type of fan from a plurality of types of fans to be selected as a system fan of the charging pile system, the method comprising:
Determining the air quantity required by a system for radiating by the charging pile system;
testing to obtain a real wind resistance curve of the charging pile system;
For each type of fans to be selected, calculating the number of fans required to meet the air quantity required by the system, and testing the actual wind resistance curve of a plurality of fans to be selected with corresponding number after being connected in parallel;
the wind resistance curve of each type of fan to be selected is intersected with the wind resistance curve of the charging pile system to obtain a plurality of working points;
selecting system working points corresponding to various fans to be selected from a plurality of working points of various fans according to the air volume required by the system;
And evaluating and comparing the system working points of various fans to be selected, finding the optimal system working point from the system working points, and determining the fan type according to the optimal system working point.
Preferably, the method further comprises: before calculating the number of fans required by the air quantity required by a system and testing the actual wind resistance curve of a plurality of fans to be selected, which are corresponding to the number, for each type of fans to be selected, according to the system impedance of the charging pile system, the air quantity required by the system, the air pressure and the air quantity provided by a fan specification, one round of preliminary screening is carried out on the types of fans to be selected.
Preferably, the testing results in a true wind resistance curve of the charging pile system, including:
after the system fans at the air outlet side of the charging pile system are disassembled, the air outlet side is aligned to the air inlet side of the wind tunnel test instrument, and wind tunnel tests are carried out after the module fans at the air inlet side of the charging pile system are respectively set at different rotating speeds, so that a plurality of wind resistance curves of the charging pile system are obtained when the module fans run at different rotating speeds.
Preferably, the testing the actual wind resistance curve after the corresponding number of the plurality of the fans to be selected are connected in parallel includes: and carrying out wind tunnel test after the fans to be selected are connected in parallel, and respectively testing to obtain wind resistance curves when the fans to be selected synchronously run at different over-rotating speeds.
Preferably, the intersecting the wind resistance curve of each type of the fan to be selected with the wind resistance curve of the charging pile system to obtain a plurality of working points includes:
aiming at each type of fan to be selected, a plurality of wind resistance curves of the corresponding fans to be selected are intersected with a plurality of wind resistance curves of the charging pile system when the corresponding fans to be selected synchronously run at different over-rotating speeds and the module fans run at different rotating speeds, so that a plurality of working points are obtained.
Preferably, the evaluating compares the system operating points of the various fans to be selected, and finds the optimal system operating point, including:
Comparing and selecting the best system working point item by item according to the following priority order: the air quantity corresponding to the system working point is closest to the air quantity required by the system, the rotating speed of the fan to be selected corresponding to the system working point is minimum, the air pressure and the air quantity corresponding to the system working point are larger, and the cost of the fan to be selected corresponding to the system working point is low.
Preferably, the determining the air volume required by the system for radiating the heat by the charging pile system includes: and calculating the air quantity required by the system based on a calculation formula Q=K×P in × (1-eta)/delta T, wherein Q represents the air quantity required by the system, P in represents the input power of the charging pile system, eta represents the conversion efficiency of the charging pile system, delta T represents the rising temperature in the system equipment, and K is a constant factor.
The fan type selecting method of the direct current charging pile system has the following beneficial effects: according to the invention, a real wind resistance curve of the charging pile system is obtained through testing, an actual wind resistance curve of the charging pile system is obtained after a plurality of fans to be selected which are required to meet the air quantity required by the system are connected in parallel, the wind resistance curve of the charging pile system is intersected with the wind resistance curve of the fans to be selected to obtain a plurality of working points, the air quantity required by the system is combined, the system working points corresponding to various fans to be selected are selected from the plurality of working points, the system working points corresponding to various fans to be selected are evaluated and compared, the optimal system working points are found, the fan type is determined according to the optimal system working points, and therefore the problems of deviation from the actual value, noise increase and cost increase of the existing fan type selecting method can be solved, the heat dissipation capacity can be improved, and the noise is reduced.
Drawings
For a clearer description of an embodiment of the invention or of a technical solution in the prior art, the drawings that are needed in the description of the embodiment or of the prior art will be briefly described, it being obvious that the drawings in the description below are only embodiments of the invention, and that other drawings can be obtained, without inventive effort, by a person skilled in the art from the drawings provided:
FIG. 1 is a flow chart of a fan-type selection method of a DC charging pile system of the present invention;
FIG. 2 is a schematic diagram of a wind resistance curve of a charging pile system;
FIG. 3 is a graph comparing wind resistance curves of individual fans of various types of fans;
FIG. 4 is an operating point of 5A fans at different rotational speeds;
fig. 5 is an operating point of 4E fans at different rotational speeds.
Detailed Description
In order that the invention may be readily understood, a more complete description of the invention will be rendered by reference to the appended drawings. Exemplary embodiments of the present invention are illustrated in the accompanying drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
The invention has the following general ideas: the charging pile system dissipates the air quantity required by the system; on one hand, testing to obtain a real wind resistance curve of the charging pile system, and on the other hand, calculating the number of fans required for meeting the air quantity required by the system and testing the actual wind resistance curve of a plurality of fans to be selected, which are connected in parallel, for each type of fans to be selected; then, the wind resistance curve of each type of fan to be selected is intersected with the wind resistance curve of the charging pile system to obtain a plurality of working points, and the system working points corresponding to the fans to be selected are selected from the plurality of working points of the fans to be selected according to the air quantity required by the system; and finally, evaluating and comparing the system working points of various fans to be selected, finding out the optimal system working point, and determining the fan type according to the optimal system working point, so that the problems of deviation from an actual value, noise increase and cost increase in the existing fan type selection method can be solved, the heat dissipation capacity can be improved, and the noise is reduced.
In order to better understand the above technical solutions, the following detailed description will be made with reference to the accompanying drawings and specific embodiments, and it should be understood that specific features in the embodiments and examples of the present application are detailed descriptions of the technical solutions of the present application, and not limit the technical solutions of the present application, and the technical features in the embodiments and examples of the present application may be combined with each other without conflict.
The invention mainly provides a fan type selecting method aiming at a direct-current charging pile for rapidly completing charging of electric vehicles such as buses, taxis, express buses, logistics buses and private buses, and the like, which is used for selecting a proper type of fan from a plurality of types of fans to be selected as a system fan of the charging pile system, so that the heat dissipation is realized, and the noise is reduced.
Referring to fig. 1, the method of the present invention includes:
S101: determining the air quantity required by a system for radiating by the charging pile system;
The required air volume of the system is particularly important for the effective operation of the system, the effective system operation must provide ideal operation conditions, so that all components in the system can play the largest function and the longest service life, for the charging pile system, the heat generated in the interior of the charging pile system P Heat of the body is the loss heat from the internal devices, namely P Heat of the body ＝Pin × (1- η), if the required heat dissipation capacity in the system equipment and the allowable total temperature rise capacity are known, the required air volume Q of the cooling equipment can be obtained through calculation, and the following basic heat conversion equation is:
H＝Cp×W×ΔT
Where H is the heat transfer quantity, where h=p Heat of the body , cp is the specific heat of air, cp=0.24 Kcal/kg· ℃ =1008J/kg· ℃, Δt is determined according to the fill pile system heat test specification, Δt is generally specified to be less than or equal to 20 ℃, W is the flowing air weight, known as w=cfm×d, where D is the air density, d=1.2 kg/m 3 in the standard state (i.e. 20 ℃,760mmHg, air humidity 65%) and, after substitution, the required air quantity Q of the system is obtained:
wherein, K is a constant factor, The general value is 1.76; η represents the conversion efficiency of the charging pile system; Δt represents the rising temperature within the system equipment; p in represents the charging pile system input power, since the charging pile system output power is generally known, P in can be calculated according to the following calculation formula:
Pin＝Pout/η (2)
Wherein, P out represents the output power of the charging pile system.
S102: testing to obtain a real wind resistance curve of the charging pile system;
After the air volume Q is known, the fan is selected in a substantially wide range. However, due to the existence of the system impedance, the real impedance characteristic curve (i.e., wind resistance curve) of the charging pile system must be known, and the curve can be obtained by testing with a special testing instrument. When air flows in the system, the air flow can encounter the obstruction of the internal parts of the system in the flow path, and the system impedance can limit the free circulation of the air so as to change the pressure of the air flow. The components inside the system cause a loss of wind pressure, which is changed by the wind volume, so-called system impedance. The smaller the system impedance, the stronger the heat dissipation capability of the system fan.
Because fill electric pile and divide into system fan and module fan, the module fan is located inside the module, is close to rack air inlet side, provides the heat dissipation for charging the module, and its effect is with the heat blowing that the module produced to rack system inside, and system fan is located the air-out side, and its effect is with the inside heat blowing of whole rack system outside the rack. The invention takes the type selection of the system fan into consideration preferentially. Because the charging pile is operated simultaneously by the system fan and the module fan when the charging pile is in normal operation, the module fan is ensured to be in operation when the system fan is selected, however, the operation of the module fan also has an influence on the system impedance, and in order to reasonably control the noise problem, the system wind resistance of the module fan at different rotating speeds is tested respectively.
Therefore, the present step S102 specifically includes: after the system fans at the air outlet side of the charging pile system are disassembled, the air outlet side is aligned to the air inlet side of the wind tunnel test instrument, and wind tunnel tests are carried out after the module fans at the air inlet side of the charging pile system are respectively set at different rotating speeds, so that a plurality of wind resistance curves of the charging pile system are obtained when the module fans run at different rotating speeds.
For example, assuming that the rotational speeds of the module fans are respectively set at M rotational speeds, M experiments are required, each experiment corresponds to one rotational speed of the module fan, and a wind resistance curve is obtained by testing at each rotational speed, so that M wind resistance curves can be obtained. The abscissa and the ordinate of the windage curve are the air volume and the air pressure respectively.
S103: for each type of fans to be selected, calculating the number of fans required to meet the air quantity required by the system, and testing the actual wind resistance curve of a plurality of fans to be selected with corresponding number after being connected in parallel;
Preferably, a round of preliminary screening of the fan type to be selected may also be performed before performing step S103. The preliminary screening includes: and (3) carrying out one round of preliminary screening on the type of the fan to be selected according to the system impedance of the charging pile system, the air volume required by the system, the air pressure and the air volume provided by the fan specification, and specifically, selecting the fan with large air pressure and large air volume required by the system.
It is noted that the end points of the windage curves are all maximum values in an ideal state, namely, the maximum air quantity of the fan in a state without pressure difference between the air inlet and the air outlet, and the fan blows air into the closed air chamber until the air quantity is the maximum static pressure of the air chamber and the outside air pressure in a zero state. The actual working is that the maximum air volume and the wind pressure are not reached, and are generally 1/3 to 2/3 of the air volume. Therefore, for each type of fan to be selected, the number of fans required to satisfy the air volume required by the system is calculated, mainly as follows: the air volume of the fan of the supplier is simply regarded as the middle value Q 0 of the two end values of the wind resistance curve of the single fan provided by the specification. According to the theoretical system required air quantity Q calculated in the step S101, the required fan quantity is Q/Q 0.
In this step, for each type of fan to be selected, an actual wind resistance curve of a corresponding number of fans to be selected after being connected in parallel is tested, which specifically includes: and aiming at each type of to-be-selected fan, connecting a plurality of corresponding to-be-selected fans in parallel, and then performing wind tunnel test to obtain wind resistance curves of the plurality of to-be-selected fans when the plurality of to-be-selected fans synchronously run at different over-rotating speeds. For example, assuming that the types of fans to be selected include a class a, a class B and a class C …, wherein the class a fans require S1 fans to be selected, the wind tunnel test can be performed after the S1 class a fans are connected in parallel, N tests can be performed, the rotation speeds of the class a fans in the N tests are different, that is, N different rotation speeds are available, a wind resistance curve at one rotation speed is obtained in each test, and N wind resistance curves of the S1 class a fans can be obtained in N tests. The fans of class B and class C … also respectively obtain N wind resistance curves according to the process.
S104: the wind resistance curve of each type of fan to be selected is intersected with the wind resistance curve of the charging pile system to obtain a plurality of working points;
The method specifically comprises the following steps: aiming at each type of fan to be selected, a plurality of wind resistance curves of the corresponding fans to be selected are intersected with a plurality of wind resistance curves of the charging pile system when the corresponding fans to be selected synchronously run at different over-rotating speeds and the module fans run at different rotating speeds, so that a plurality of working points are obtained. For example, for a type a fan, the N curves obtained in step S103 are intersected with the M curves obtained in step S102 to obtain m×n intersection points, i.e., m×n operation points.
Because the curve obtained in step S102 carries three kinds of information including the air volume, the air pressure and the rotational speed of the module fan, and the curve obtained in step S103 carries three kinds of information including the air volume, the air pressure and the rotational speed of the fan to be selected, each working point carries four kinds of information as follows: the air quantity, the air pressure, the rotating speed of the module fan and the rotating speed of the fan to be selected.
S105: selecting system working points corresponding to various fans to be selected from a plurality of working points of various fans according to the air volume required by the system;
Generally, the higher the working point is, the better the working point is, the purpose of finding the working point is to know whether the air quantity during operation can meet the theoretically calculated air quantity or not, and the rotating speeds are different from one another, so that a plurality of working points exist, noise is considered, the air quantity is required to be met, and the most suitable working point is required to be selected to determine the proper rotating speed. And in the plurality of working points, the working point meeting the total cooling requirement is found, the rotating speed of the fan to be selected (the rotating speed of the system rotating speed) and the rotating speed of the module fan are determined according to the working point, and whether the noise meets the requirement is tested.
Therefore, continuing with the example of step S104 above, for a type a fan, m×n operating points are obtained in step S103, and the operating point having the air volume information closest to the air volume Q calculated in step S101 can be selected from among numerous operating points as the optimal operating point. The same applies to the system operating point of other types of fans. It should be noted that, due to different rotation speeds, there may be multiple working points meeting the air quantity Q in practice, and at this time, noise test may be further performed on the working point meeting the air quantity Q, and the working point with the lowest noise is selected as the system working point.
S106: and evaluating and comparing the system working points of various fans to be selected, finding the optimal system working point from the system working points, and determining the fan type according to the optimal system working point.
Specifically, the optimal system operating points are compared item by item and selected according to the following priority order: ① The air quantity corresponding to the system working point is closest to the air quantity required by the system, the rotating speed of the fan to be selected corresponding to the ② system working point is minimum, and the air pressure and the air quantity corresponding to the ③ system working point are larger; ④ The cost of the selected fan corresponding to the system working point is low.
That is, firstly, the comparison is performed according to ①, the system operating point with the air quantity closest to the air quantity required by the system is selected, and the comparison is further performed according to ② because the system operating point meeting ① is a lot, and the optimal system operating point is finally selected. Because each system operating point is a corresponding type of fan, the optimal system operating point, and thus the fan type, is determined.
The following is an illustration of a fan option for a 120kW charging pile system.
1) And calculating the air quantity Q required by the system.
The known output power P out and conversion efficiency eta of the charger (charging pile system), such as the output power P out of the charger, of 60KW, 120KW and 150KW, are all assumed that the conversion efficiency eta of the charger is 93%, the temperature difference DeltaT is 20 ℃, K is 1.76, and Q is 794CFM calculated by substituting the calculated formulas (1) and (2).
2) And acquiring a wind resistance curve of the charging pile system.
The wind tunnel test instrument equipment of a fan supplier laboratory is utilized for testing, and the wind volume test range is as follows: 0.2CFM-2000CFM, the wind pressure test range is: 0mmAq-800mmAq, passing the wind tunnel test. The system fan of the direct current charging pile is dismantled, the air outlet side of the charging pile is aligned with the air inlet side of the wind tunnel test instrument and is sealed, the system wind resistance when the module fan rotating speed is 0%,20%,30%,50%,80% and 100% is tested respectively, the 6 obtained wind resistance curves are shown in figure 2, the abscissa Q_STP (CFM) of the curves is the system air quantity, the ordinate P_STP (mmAq) is the system wind pressure, and obviously, the system impedance can be reduced along with the increase of the module fan rotating speed.
3) And (5) carrying out primary screening on various types of fans.
The system fans used in the charging stake industry were found to be roughly sized into three categories as shown in table 1:
Table 1 charging pile general system fan type
We selected class 7 fans from 5 fan suppliers (A, B, C, D, E) and collated the windage curves provided by the specifications of these class 7 fans together as shown in figure 3. From the curve in fig. 3: the 20060 type fan has large air quantity, but the air pressure is too small, and in terms of system heat dissipation, the air pressure is insufficient to blow out the heat in the system outside the cabinet, so that the air quantity and air pressure curve is poor; the 17251 type fan air volume and air pressure curve is preferable, and as can be seen from table 1, the noise of the fan is acceptable; 12038 fan air volume and pressure are too small, the curve is poor, and the noise is large as shown in table 1. Therefore, a round of preliminary screening can be carried out on the fans from the curve, and the fans with proper sizes are selected for brand selection.
4) And acquiring wind resistance curves of various fans, determining system working points of the various fans, and selecting the optimal system working points.
The air quantity Q required by the heat dissipation of the system is 794CFM through the calculation in the step 1). The fans remaining after the screening in the step 3) above, each fan type is calculated to satisfy the quantity of the air quantity Q.
Taking an AC200 x 60 fan of a supplier a as an example, because the maximum value of two ends of the fan curve is an ideal state, and the actual working state is 1/3-2/3 of the air volume, the air volume of the AC200 x 60 fan of the supplier a can be simply regarded as 150CFM, the number is 794 CFM/150=5-6, 5 fans a are assumed to be 5, 5 windage curves are obtained when 5 fans a synchronously run at 50%,60%,70%,80% and 100%, and then the 5 windage curves are intersected with 6 windage curves in fig. 2, so that 30 working points can be obtained, as shown in fig. 4, among the 30 working points, the working points meeting the system cooling requirement (the air volume Q is 794 CFM) are (780 CFM,3mmh 2), and the rotating speed of the fan a is 100% at the moment, and the rotating speed of the module fan is 100%.
Similarly, for the 172×51 fans of the supplier E, 4 fans E are selected, where the 4 fans E synchronously run at 50%,60%,70%,80%, and 5 windage curves obtained when 100% meet 6 windage curves in fig. 2, and 30 working points can be obtained, as shown in fig. 5, among the 30 working points, the working point meeting the system cooling requirement (the air volume Q is 794 CFM) is that the rotation speed of the fan E is 70%, and the rotation speed of the module fan is 50%.
It can be seen that, compared with fan a, fan E is close to the system operating point of fan a at 70% rotational speed, and from comparison, the heat dissipation is also satisfactory. And the noise is reduced due to the reduction of the rotation speed, so that the fan E is more suitable to be selected as a system fan in comparison. It will be appreciated that the above is merely illustrative of a comparison of A, E fans, and that in fact, there may ultimately be more advantages, not yet developed. The optimal system operating point can be found by comparing item by item according to the priority order mentioned in step S106, and the corresponding fan type is determined.
Noise testing:
Fan A, E noise vs. data are shown in table 2. It can be found that the noise is obviously reduced when the rotating speed is regulated to 60% by selecting the fan E aiming at the air outlet side of the charger. In addition, 100mm of louvers with a silencing function are added on the air inlet side, and on the premise that heat dissipation is not affected, the module fan is rotated to 40%, so that the noise on the air inlet side is reduced to 65dB. The overall noise data is shown in table 3, and finally, it is confirmed that 4E fans 17251 are selected as system fans, 100mm louvers with silencing function are added on the air inlet side, and the charging module carries out flexible fan rotation speed adjustment, so that the noise reduction aim is finally achieved.
Table 2 actual measured data of fan noise
Table 3 battery charger noise reduction processing overall noise data
Thermal testing:
The thermal test comparison data are shown in table 4, and it can be seen from the test data that when the fan A is adopted, the temperature in the cabinet is increased when the fan speed of the charging module is 40%, and when the ambient temperature is 40 ℃, the device overtemperature occurs in the charging module, and the critical derating output occurs. When the fan E is adopted, other conditions are the same, when the system fan rotates to be regulated to 60%, the charging module device is over-heated only when the ring temperature is 47 ℃, and critical power-off output is realized. The fan E is qualified for the heat dissipation design of the charger system.
Table 4 results of thermal testing of the system
In summary, the fan type selecting method of the direct current charging pile system has the following beneficial effects: according to the invention, a real wind resistance curve of the charging pile system is obtained through testing, an actual wind resistance curve of the charging pile system is obtained after a plurality of fans to be selected which are required to meet the air quantity required by the system are connected in parallel, the wind resistance curve of the charging pile system is intersected with the wind resistance curve of the fans to be selected to obtain a plurality of working points, the air quantity required by the system is combined, the system working points corresponding to various fans to be selected are selected from the plurality of working points, the system working points corresponding to various fans to be selected are evaluated and compared, the optimal system working points are found, the fan type is determined according to the optimal system working points, and therefore the problems of deviation from the actual value, noise increase and cost increase of the existing fan type selecting method can be solved, the heat dissipation capacity can be improved, and the noise is reduced.
The embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those having ordinary skill in the art without departing from the spirit of the present invention and the scope of the claims, which are to be protected by the present invention.
Claims (6)
1. A fan-type selection method of a direct current charging pile system, for selecting a proper type of fan from a plurality of types of fans to be selected as a system fan of the charging pile system, the method comprising:
Determining the air quantity required by a system for radiating by the charging pile system;
testing to obtain a real wind resistance curve of the charging pile system;
For each type of fans to be selected, calculating the number of fans required to meet the air quantity required by the system, and testing the actual wind resistance curve of a plurality of fans to be selected with corresponding number after being connected in parallel;
the wind resistance curve of each type of fan to be selected is intersected with the wind resistance curve of the charging pile system to obtain a plurality of working points;
selecting system working points corresponding to various fans to be selected from a plurality of working points of various fans according to the air volume required by the system;
Evaluating and comparing system working points of various fans to be selected, finding an optimal system working point from the system working points, and determining the fan type according to the optimal system working point;
Wherein, the evaluation compares the system working points of various fans to be selected, finds the best system working point, and comprises: comparing and selecting the best system working point item by item according to the following priority order: the air quantity corresponding to the system working point is closest to the air quantity required by the system, the rotating speed of the fan to be selected corresponding to the system working point is minimum, the air pressure and the air quantity corresponding to the system working point are larger, and the cost of the fan to be selected corresponding to the system working point is low.
2. The method according to claim 1, wherein the method further comprises: before calculating the number of fans required by the air quantity required by a system and testing the actual wind resistance curve of a plurality of fans to be selected, which are corresponding to the number, for each type of fans to be selected, according to the system impedance of the charging pile system, the air quantity required by the system, the air pressure and the air quantity provided by a fan specification, one round of preliminary screening is carried out on the types of fans to be selected.
3. The method of claim 1, wherein the testing results in a true wind resistance curve of the charging pile system, comprising:
after the system fans at the air outlet side of the charging pile system are disassembled, the air outlet side is aligned to the air inlet side of the wind tunnel test instrument, and wind tunnel tests are carried out after the module fans at the air inlet side of the charging pile system are respectively set at different rotating speeds, so that a plurality of wind resistance curves of the charging pile system are obtained when the module fans run at different rotating speeds.
4. The method of claim 3, wherein the testing the actual wind resistance curve for a corresponding number of the plurality of candidate fans in parallel comprises: and carrying out wind tunnel test after the fans to be selected are connected in parallel, and respectively testing to obtain wind resistance curves when the fans to be selected synchronously run at different over-rotating speeds.
5. The method of claim 4, wherein the intersecting the wind resistance curve of each type of the candidate fans with the wind resistance curve of the charging pile system to obtain a plurality of working points comprises:
aiming at each type of fan to be selected, a plurality of wind resistance curves of the corresponding fans to be selected are intersected with a plurality of wind resistance curves of the charging pile system when the corresponding fans to be selected synchronously run at different over-rotating speeds and the module fans run at different rotating speeds, so that a plurality of working points are obtained.
6. The method of claim 1, wherein determining the required air volume for the system for dissipating heat from the charging pile system comprises: and calculating the air quantity required by the system based on a calculation formula Q=K×P in × (1-eta)/delta T, wherein Q represents the air quantity required by the system, P in represents the input power of the charging pile system, eta represents the conversion efficiency of the charging pile system, delta T represents the rising temperature in the system equipment, and K is a constant factor.
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Non-Patent Citations (1)
| Title |
|---|
| 电动汽车直流充电桩散热系统优化分析;侯春光等;《电气工程学报》;20180531;第13卷(第5期);第8-13页 * |
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