CN204859098U - Pneumatic guide plate of photovoltaic array - Google Patents

Abstract

The utility model discloses a pneumatic guide plate of photovoltaic array, including a pneumatic profile board and the panel outside tail fin along the distribution of panel axial. The utility model discloses a guide plate has adopted pneumatic profile board for the speed and the orientation of near photovoltaic array air current change, have reduced the pull out force that photovoltaic array receives under the wind loading, produce certain overdraft simultaneously, have increased photovoltaic array's steadiness, the guide plate tail fin can increase the angle and the yardstick of the separation of incoming flow shear layer, forms good occlusion effect, and the reduction incoming flow reduces photovoltaic array bearing structure NULL to low reaches photovoltaic array's influence. The utility model has the characteristics of the dimensional change scope is wide, simple structure, it is all applicable to photovoltaic surface power station and photovoltaic roof power station, easily operate in reality, but greatly reduced photovoltaic array bearing structure's engineering cost is used when increasing the structure steadiness.

Description

The pneumatic baffler of a kind of photovoltaic array

Technical field

The utility model relates to photovoltaic field, particularly the pneumatic baffler of a kind of photovoltaic array.

Background technology

Along with green building and low-carbon energy-saving theory more and more come into one's own, solar photovoltaic industry progressively rises.Because solar energy photovoltaic panel is generally the larger flat rectangular plate of area, and the ply stacking angle of photovoltaic panel determines inclination angle with maximum generation rate, and under high wind, photovoltaic array structure bears larger wind load.For the Northern Hemisphere, under north wind, load suffered by photovoltaic array structure be can be analyzed to: the power that starts on vertical direction and horizontal direction pull power.When wind-force is larger, wind load can not be ignored.No matter be surface power station or power station, roof, for avoiding wind load to the destruction of photovoltaic module and mounting system, ensure the normal operation of photovoltaic plant, wind load is all the critical consideration of whole photovoltaic system designed and calculated.

The method that current domestic and international existing photovoltaic array structural design all adopts " directly resisting ", its general structure is as shown in Fig. 1 (a) to Fig. 1 (d).Power station, roof many employings precast concrete beam or prefabricated briquetting increase the deadweight of array structure and frictional force to resist the power of starting and to pull power, but this kind of scheme adds the heavy burden of original roofing, is unfavorable for the safety of inhering architecture; Adopt cast-in-place support basis then to original building and roof water-proof damage layer larger.Surface power station then more adopts the form increasing strip footing or increase embedded depth of foundation, and the specification increasing supporting construction is to resist wind load, but this kind of scheme adds amount of concrete and steel using amount.Therefore, no matter be roof or surface power station, adopt the mode of " directly resisting " to carry out conceptual design and can cause photovoltaic plant site requirements higher, and construction cost be larger.

Utility model content

Based on this, the purpose of this utility model is to provide a kind of photovoltaic array pneumatic baffler, and described baffler comprises air-driven type panel and the air-driven type panels outside tail fin along panel axial distribution; Described air-driven type erecting of panel is in photovoltaic array structure.

Accompanying drawing explanation

The structural representation of Fig. 1 (a) to Fig. 1 (d) for photovoltaic devices in prior art; Wherein, the structure vertical view that Fig. 1 (a) is photovoltaic devices, the structural perspective that Fig. 1 (b) is photovoltaic devices, the structure side view that Fig. 1 (c) is photovoltaic devices, the end view in another direction of structure that Fig. 1 (d) is photovoltaic devices;

Fig. 2 (a) to Fig. 2 (b) is the structural representation of photovoltaic structure baffler in an embodiment; Wherein,

Fig. 2 (a) is the schematic diagram of photovoltaic structure baffler tail fin structure, and Fig. 2 (b) is the structural representation of photovoltaic structure baffler;

Fig. 3 is photovoltaic array baffler air-driven type section curve and tail fin high computational schematic diagram in an embodiment;

Fig. 4 (a) to Fig. 4 (b) installs designs simplification schematic diagram after baffler additional for photovoltaic array in the utility model embodiment; Wherein, Fig. 4 (a) is the vertical view that in an embodiment, photovoltaic array installs designs simplification schematic diagram after baffler additional, and Fig. 4 (b) is the end view that in an embodiment, photovoltaic array installs designs simplification schematic diagram after baffler additional;

Fig. 5 (a) to Fig. 5 (c), for calculating model schematic in the utility model embodiment, comprises non-mounting guiding board and the correlation computations model schematic installed after baffler;

Fig. 6 is photovoltaic array near wall place stress and strain model schematic diagram in the utility model embodiment;

Fig. 7 is wall place stress and strain model schematic diagram near pneumatic baffler tail fin in the utility model embodiment.

Embodiment

Below in conjunction with drawings and Examples, embodiment of the present utility model is described in further detail.Following examples for illustration of the utility model, but are not used in restriction scope of the present utility model.

In one embodiment, the utility model discloses the pneumatic baffler of a kind of photovoltaic array and comprise: air-driven type panel and panels outside are along the tail fin of panel axial distribution, and described air-driven type erecting of panel is in photovoltaic array structure.

As shown in Fig. 2 (a), Fig. 2 (b), described air-driven type panel and tail fin form pneumatic baffler, offset, shifted before aerodynamic loading affects photovoltaic array structure.Baffler tail fin can increase angle and the yardstick of the separation of incoming flow shear layer, forms good occlusion effect, reduces incoming flow to the impact of downstream photovoltaic array, reduces photovoltaic array supporting construction material usage.

The present embodiment mainly directly protects for wind load for existing photovoltaic array supporting construction, add the requirement in photovoltaic plant place and the shortcoming of power plant construction cost, the transformation concept when structural design, " directly will resist " and change " dredging, water conservancy diversion " even " effectively utilization " into, while reducing wind load impact, increase the steadiness of photovoltaic array structure.

The present embodiment has been installed air-driven type panel and has been distributed in the tail fin of panels outside distribution in the side of photovoltaic array structure, wind-force is kept out in the deadweight of replacing original increase photovoltaic structure by this structure, the weight of inhering architecture need not be increased, that effectively can reduce that wind load causes starts power, and being converted into downforce to increase the steadiness of photovoltaic array structure, raising photovoltaic devices resists the ability that wind carries.

In one embodiment, described air-driven type panel section curve is cosine curve.

Why the section curve of air-driven type panel is made cosine curve by the present embodiment, is to be absorbed by incoming flow by its aerodynamic configuration and guide to outside many array regions, thus reduces the size of wind load suffered by array.

In one embodiment, described cosine curve expression formula is:

$y=H_D\·cos(\frac{\mathrm{\π}}{2S}\·x)$

In formula, H _dfor pneumatic baffler vertical height, S is pneumatic baffler horizontal direction span.

In one embodiment, see relevant drawings, the width B of described air-driven type panel _dbe not less than the width B of photovoltaic array, the vertical height H of air-driven type panel _dbe not less than the vertical distance H that photovoltaic module is low to moderate highest point most; The spacing of described photovoltaic array structure highest point and air-driven type panel top edge is not more than 30mm.

Requirement on the present embodiment yardstick and to control baffler and array gap be to make the complete covering photovoltaic array of the water conservancy diversion scope of pneumatic baffler, thus strengthen the water conservancy diversion effect of pneumatic baffler, reduce wind load greatly.

Because China north and south is comparatively large across latitude, about 49 °, different regions corresponding solar cell array optimum angle of incidence difference is obvious, and scope is between 10 °-45 °.In one embodiment, described photovoltaic array inclination alpha, between 5 °-50 °, covers optimum angle of incidence scope.Meanwhile, in the present embodiment, photovoltaic bracket is installed in the horizontal plane.In one embodiment, described air-driven type panel comprises at least one tail fin, when comprising multiple tail fin, described multiple tail fin is evenly distributed on air-driven type panel.

Further, the determination formula of described tail fin height is:

$h=\frac{L}{2}\·sin(\frac{H_D}{15S}\·\mathrm{\α})$

In formula, L is photovoltaic array width, H _dfor pneumatic baffler vertical height, S is pneumatic baffler horizontal direction span, and α is photovoltaic array inclination angle.

Further, described tail fin is perpendicular to horizontal plane, and its length w equals baffler length.

A specific embodiment is: Xinjiang photovoltaic plant project photovoltaic structure baffler designs:

(1) determine the yardstick of photovoltaic array, model and size are as shown in Fig. 1 (a) to Fig. 1 (d);

Photovoltaic array length B=7.29m, photovoltaic array width L=2.48m, array thickness T=0.1m, array inclination alpha=25 °, vertical direction projection H=Lsin α+T/cos α=1.50m after array tilt.

(2) calculate each parameter of the pneumatic baffler of photovoltaic array, model schematic is as shown in Fig. 2 (a), Fig. 2 (b); Size calculation as shown in Figure 3;

Design pneumatic baffler vertical height H _d=H=1.50m, pneumatic baffler horizontal direction span S=1.25m, baffler width B _d=B=7.29m.

Air-driven type panel section cosine curve expression formula:

Tail fin height: tail fin width w=B=7.29m.

After mounting guiding board, photovoltaic array schematic diagram is as shown in Fig. 4 (a) to Fig. 4 (b).

(3) utilize CFD numerical method, calculate the magnitude of load installed before and after pneumatic baffler suffered by each array;

Array terrain clearance is 0.6m, array pitch 3.5m, and computation model gets 5 row array row.Computation model and scale diagrams are as shown in Fig. 5 (a) to Fig. 5 (c); Array peak ground clearance H0=2.1m.The longitudinal width of computation model is 20H0.In the middle of photovoltaic array displacement computation model.

Incoming flow wind direction is perpendicular to photovoltaic panel arragement direction (north wind);

Incoming flow parameter: v=26m/s, P=1.01 × 10 ⁵pa, Re=2.17 × 10 ⁶1/m, T=288.15K;

Wherein, v is incoming flow wind speed, and P is pressure, and Re is Reynolds number, and T is temperature;

Flow field calculation equation adopts based on the average N-S equation of Favre, and for ensureing that equation is closed, adopt (SST) k-ω two-equation turbulence model in coefficient of eddy viscosity method in the present embodiment, numerical algorithm is finite volume method.For ensureing computational accuracy, encrypt gradually near structure wall area grid.Wall boundary layer is 10 layers, minimum dimension 0.001m, growth factor 1.2.As shown in Figure 6, near pneumatic baffler tail fin, wall place stress and strain model as shown in Figure 7 for photovoltaic array near wall place stress and strain model;

By air parameter in region, initial value and boundary condition substitute in theoretical model and obtain Flow Field Calculation result.

(4) blast change suffered by array before and after the pneumatic baffler of photovoltaic array is installed in contrast;

The result of calculation of table 1 wind load suffered by different array:

Can be obtained by table 1, after being installed in addition with baffler, array first row of horizontal power size is directly support 5.3%, and first row's vertical force size is directly support 7.7%, and suffered by all the other each arrays, the absolute value of horizontal force, vertical force reduces all to some extent.Horizontal force suffered by whole array reduces 18.2%, and vertical force reduces 90.3%.After being installed in addition with the pneumatic baffler of photovoltaic array, aerodynamic loading declines obviously.

Table 1

It should be pointed out that for those skilled in the art, under the prerequisite not departing from the utility model know-why, can also make some improvement and replacement, these improve and replace the scope all not departing from spirit of the present utility model and claim record.

Claims (8)

1. the pneumatic baffler of photovoltaic array, is characterized in that: described baffler comprises air-driven type panel and the air-driven type panels outside tail fin along panel axial distribution; Described air-driven type erecting of panel is in photovoltaic array structure.

2. baffler according to claim 1, is characterized in that: described air-driven type panel section curve is cosine curve.

3. baffler according to claim 2, is characterized in that: described air-driven type panel section cosine curve expression formula is:

In formula, H _dfor pneumatic baffler vertical height, S is pneumatic baffler horizontal direction span.

4. baffler according to claim 1, is characterized in that: the length of described air-driven type panel is not less than the length of photovoltaic module in photovoltaic array, and the vertical height of air-driven type panel is not less than the height of photovoltaic module.

5. baffler according to claim 1, is characterized in that: described air-driven type panel comprises at least one tail fin, and when comprising multiple tail fin, described multiple tail fin is evenly distributed on air-driven type panel.

6. baffler according to claim 1, is characterized in that: the determination formula of described tail fin height is:

In formula, L is photovoltaic array width, H _dfor air-driven type panel vertical height, S is air-driven type panel-level direction span, and α is photovoltaic array inclination angle.

7. baffler according to claim 1, is characterized in that: described tail fin is perpendicular to horizontal plane, and its length is identical with air-driven type panel length.

8. baffler according to claim 4, is characterized in that: the spacing of described photovoltaic array structure highest point and air-driven type panel top edge is not more than 30mm.