Water consumption analysis and calculation model of photovoltaic dust cleaning with super-hydrophobic coating

Abstract

The present application relates to a kind of superhydrophobic coating photovoltaic dust removal water consumption analysis calculation model, including 1, by the way of liquid drop rolling dust removal, clean the dust on the surface of photovoltaic module with superhydrophobic coating;2, calculate the cubic polynomial of the dust mass ms removed by unit liquid drop rolling;3, obtain the number N of liquid drops consumed to remove all dust on the photovoltaic module of photovoltaic power station;4, based on the proportional relationship between the total dust removal water consumption of photovoltaic module of photovoltaic power station and the volume of single liquid drop, calculate the total water consumption V of dust cleaning on the surface of photovoltaic module of photovoltaic power station.The beneficial effects of the present application are: the superhydrophobic coating photovoltaic dust removal water consumption analysis calculation model can quickly calculate the total water consumption of liquid drop cleaning on the surface of photovoltaic module of large-scale photovoltaic power station, accurately control the water supply of the photovoltaic power station, and review the statistical survey data of cleaning water of photovoltaic power station.In addition, it can be used to compare with the water consumption of other cleaning methods, and then analyze its water-saving performance.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of photovoltaic technology, in particular to a water consumption analysis and calculation model for photovoltaic dust removal with super-hydrophobic coating. BACKGROUND

[0002] The mainstream solar cell power generation efficiency used in China's photovoltaic power station can only reach 24%, with the increase of solar installed capacity, how to improve the power generation efficiency of solar cell and increase the power generation, is a problem to be solved under the background of "carbon peak and carbon neutralization".

[0003] The most abundant solar energy resources in China are mainly in the northern part of Ningxia and the northern part of Gansu, but these areas are dry and dusty, with a large amount of dust deposited on the surface of solar photovoltaic panels, reducing the output efficiency of photovoltaic panels. The existing cleaning dust method is mainly manual, which is low in efficiency and consumes a large amount of water resources.

[0004] Super-hydrophobic phenomenon is inspired by the self-cleaning effect of lotus leaves. When raindrops fall on the surface of lotus leaves, rainwater will roll off and clean the dust on the surface of lotus leaves. The super-hydrophobic coating designed on this basis has a wide application in people's life, often applied to fields such as architecture, clothing and biomedical engineering. The mechanism of water droplet removing dust particles on super-hydrophobic surface is determined as water droplet covering dust particles and moving with them, and a small amount of water can remove a large amount of dust.

[0005] Due to the drought and lack of rain in northwest China, the scarcity of water resources restricts the practical application of manual cleaning and water jet cleaning of solar cell surface dust in traditional cleaning methods. Therefore, it is of great significance to study the cleaning method of photovoltaic power station with super-hydrophobic coating and its water consumption for improving the quality and efficiency of small photovoltaic power stations in arid areas and saving water resources.

[0006] Therefore, it is necessary to design a water consumption analysis and calculation model for photovoltaic dust removal with super-hydrophobic coating. SUMMARY

[0007] The purpose of the present application is to provide a water consumption analysis and calculation model for photovoltaic dust removal with super-hydrophobic coating to solve the problems raised in the background art.

[0008] To achieve the above purpose, the present application provides the following technical solution: a water consumption analysis and calculation model for photovoltaic dust removal with super-hydrophobic coating, comprising the following steps:

[0009] Step 1, this method is used for water consumption analysis and calculation of liquid droplet dust removal on super-hydrophobic surface of photovoltaic module;

[0010] Step 2, taking the radius Rm of the droplet after the super-hydrophobic coating surface dust removal as input, based on the characteristic number Bo of measuring the droplet shape, according to the selected volume Vd = 50 μL of the droplet for dust removal, the cubic polynomial of Rm about the mass ms of the dust removed by the unit droplet rolling is fitted;

[0011] Step 3, using the mass ms of the dust particles removed by the unit droplet rolling, by inputting the total surface area S of the photovoltaic module of the photovoltaic power station and the dust density Rd, the number N of droplets consumed for removing all dust on the photovoltaic module of the photovoltaic power station is obtained;

[0012] Step 4, based on the proportional relationship between the total dust removal water consumption of the photovoltaic module of the photovoltaic power station and the volume of a single droplet, the total dust cleaning water consumption V of the photovoltaic module surface of the photovoltaic power station is calculated.

[0013] Further, the step 1 comprises:

[0014] Step 11, cleaning the photovoltaic module by rolling the droplet to wrap the dust on the surface of the photovoltaic module, and dripping a certain volume of droplet above the super-hydrophobic photovoltaic module, the droplet will take away the dust particles on the surface in the form of rolling.

[0015] Further, the step 2 comprises:

[0016] Step 21, experiments show that under the condition of Bo = 1, the mass of the dust particles contained in the droplet after rolling is the highest, and the number of droplets required to remove a certain mass of dust is the least.

[0017] Further, the cubic polynomial fitting the radius of the mixed droplet and the mass of the dust contained therein with the initial volume Vd of 50 μL is shown in formula (1):

[0018]

[0019] Where Rm is the radius of the mixed droplet, and ms is the mass of the dust removed by the droplet rolling.

[0020] Further, the step 2 further comprises:

[0021] Step 22, measuring the radius Rm of the mixed droplet after the droplet rolling cleaning the surface, and calculating the mass ms of the dust wrapped therein.

[0022] Further, the step 3 comprises:

[0023] Step 31, calculating the total surface area of the photovoltaic module according to the installed capacity of the photovoltaic power station and measuring the dust density of the photovoltaic module surface area.

[0024] Further, the formula (2) is as follows:

[0025]

[0026] Further, the step 3 further comprises:

[0027] Step 32, according to the mixed droplet radius Rm and the dust mass ms removed by droplet rolling, the number of droplets consumed for removing all dust on the photovoltaic module of the photovoltaic power station N is obtained by formula (2).

[0028] Further, the formula (3) is as follows:

[0029] V = NV d Formula (3).

[0030] Further, the step 4 comprises:

[0031] Step 41, the number of droplets consumed for removing all dust on the photovoltaic module of the photovoltaic power station N is multiplied by the unit droplet of the volume Vd = 50 μL used for cleaning to obtain the water amount used for removing all dust on the photovoltaic module of the photovoltaic power station, which can be calculated by formula (3).

[0032] Compared with the prior art, the beneficial effects of the present application are: while providing a photovoltaic module surface cleaning method with high efficiency and low water consumption, the total water amount used for droplet cleaning of the photovoltaic module surface of a large range of photovoltaic power stations can be quickly calculated, the water supply amount for the photovoltaic power station can be accurately controlled, and the statistical investigation data of the cleaning water for the photovoltaic power station can be reviewed. In addition, it can be used to compare the water consumption of other cleaning methods, and then analyze the water-saving performance. BRIEF DESCRIPTION OF DRAWINGS

[0033] Fig. 1 The flow chart of the water consumption analysis and calculation of the photovoltaic module surface droplet dust removal of the present application;

[0034] Fig. 2 The schematic diagram of the photovoltaic module surface droplet dust removal method of the present application;

[0035] Fig. 3 The water consumption of droplet cleaning under different dust accumulation densities of the present application;

[0036] Fig. 4 The comparison chart of the water consumption of the present application and other cleaning methods. DETAILED DESCRIPTION

[0037] As shown in Figs. 1 to 4 The present application provides a technical solution: a water consumption analysis and calculation model for photovoltaic dust removal with super-hydrophobic coating, comprising the following steps:

[0038] Step 1, the method is used for water consumption analysis and calculation of super-hydrophobic surface droplet dust removal of photovoltaic modules;

[0039] Step 2, taking the radius Rm of the droplet after the super-hydrophobic coating surface dust removal as input, based on the characteristic number Bo of measuring the droplet shape, according to the selected volume Vd = 50 μL of the droplet for dust removal, a cubic polynomial of Rm about the mass ms of the dust removed by unit droplet rolling is fitted;

[0040] Step 3, using the mass ms of the dust particles removed by the unit droplet rolling, by inputting the total surface area S of the photovoltaic module of the photovoltaic power station, the dust density Rd, to obtain the number N of droplets consumed to remove all dust on the photovoltaic module of the photovoltaic power station;

[0041] Step 4, based on the proportional relationship between the total dust removal water consumption of the photovoltaic module of the photovoltaic power station and the volume of a single droplet, the total dust cleaning water consumption V of the photovoltaic module surface of the photovoltaic power station is calculated;

[0042] Specific operation as follows, while providing a high-efficiency and low-water-consumption photovoltaic module surface cleaning method, the total water consumption of the droplet cleaning of the photovoltaic module surface of the large-scale photovoltaic power station can be quickly calculated, the water supply of the photovoltaic power station can be accurately controlled, and the statistical investigation data of the cleaning water of the photovoltaic power station can be reviewed. In addition, it can be used to compare the water consumption of other cleaning methods, and then analyze the water-saving performance.

[0043] Step 1 includes:

[0044] Step 11, cleaning the photovoltaic module by rolling the droplet to wrap the dust on the surface of the photovoltaic module, and titrating a certain volume of droplet above the super-hydrophobic photovoltaic module, the droplet will take away the dust particles on the surface in the form of rolling.

[0045] Step 2 includes:

[0046] Step 21, experiments show that under the condition of Bo = 1, the mass of the dust particles contained in the droplet after rolling is the highest, and the number of droplets required to remove a certain mass of dust is the least. Based on this, the equation of the radius of the mixed droplet with an initial volume Vd of 50 μL and the mass of the dust contained therein is fitted as formula (1):

[0047]

[0048] Where Rm is the radius of the mixed droplet, and ms is the mass of the dust removed by the droplet rolling

[0049] Step 22, the radius Rm of the mixed droplet after the droplet rolling cleaning surface is measured, and the mass ms of the dust wrapped is calculated.

[0050] Step 3 includes:

[0051] Step 31, according to the installed capacity of the photovoltaic power station, the total surface area of the photovoltaic module is calculated, and the dust density of the photovoltaic module surface area is measured.

[0052] Step 32, according to the mixed droplet radius Rmand the dust mass msremoved by droplet rolling, the number of droplets consumed to remove all dust on the photovoltaic module of the photovoltaic power station N is obtained by formula (2).

[0053]

[0054] Step 4 includes:

[0055] Step 41, multiply the number of droplets consumed to remove all dust on the photovoltaic module of the photovoltaic power station N by the unit droplet volume Vd=50μL used for cleaning, to obtain the water amount used to remove all dust on the photovoltaic module of the photovoltaic power station, as shown in formula (3):

[0056] V=NV d Formula (3)

[0057] Working principle: Step 1, adopt the way of cleaning the photovoltaic module by rolling the droplets to wrap the dust on the surface of the photovoltaic module. Take the droplet radius Rmafter a droplet completes the dust removal on the super-hydrophobic coating surface as input, based on the characteristic number Boof measuring the droplet shape, select a suitable cubic polynomial fitting formula about msaccording to the unit droplet volume Vdselected for dust removal, where msis the dust mass removed by unit droplet rolling. Specifically, take Bo=1, when the Bois 1, the droplet is in a critical state of shape transition from surface tension to gravity, at this time the droplet is in the state of transition from spherical to ellipsoidal, the mass of dust particles contained in the droplet is the highest, and the unit volume of droplet required to remove a certain mass of dust is the least. Based on the case of Bo=1, according to the volume Vd=50μL of the cleaning droplet used, a cubic polynomial of Rmabout msis fitted. The fitted equation m s =-326.52+293.8R m -105.72R m 2 +17.34R m 3The radius Rm of the mixed droplet after rolling on the clean surface is measured, and the dust mass ms entrained by the droplet is calculated. The sand-containing droplet data matching the region is selected. Here, the photovoltaic power station in Jiuquan, Gansu Province is taken as an example, Rm=2.6mm is measured, and ms=27.78mg is calculated according to the fitted quadratic trinomial. The mass ms of dust particles removed by a unit droplet is used to obtain the number N of droplets consumed to remove all the dust on the photovoltaic module of the photovoltaic power station by inputting the total surface area S of the photovoltaic module and the dust deposition density Rd. Specifically, the M12 round single crystal PERC silicon wafer is used in the photovoltaic module of the photovoltaic power station. Taking this silicon wafer as an example, the power of the silicon wafer is 9.97W (edge length 210mm), and the silicon wafer area per W is about 0.044m 2 , and the power of the photovoltaic module per square meter is 0.227kW. Taking the power of the photovoltaic module per unit area as the conversion reference, the total surface area of the photovoltaic module of the photovoltaic power station can be calculated according to the installed capacity of the photovoltaic power station. Assuming that the installed capacity of the photovoltaic power station is 200kW, the total surface area of the photovoltaic module is 881m 2 . According to the research, the dust density Rd of the surface area of the photovoltaic power station in Jiuquan is 33.83g / m 2 . According to the dust mass ms removed by a unit droplet, the number N of droplets consumed to remove all the dust on a unit photovoltaic module is obtained. Based on the proportional relationship between the total dust removal water consumption of the photovoltaic module of the photovoltaic power station and the volume of a single droplet, the total water consumption for cleaning the dust on a unit photovoltaic surface is calculated. Specifically, the number N of droplets consumed to remove all the dust on a unit photovoltaic module is multiplied by a unit droplet with a cleaning volume Vd=50μL to obtain the water consumption V for removing all the dust on a unit photovoltaic module, as shown in the formula V=N·V d =1072·50·10 -3 =53.64L.

Claims

1. A superhydrophobic coated photovoltaic dusting water consumption analysis model, characterized in that, It comprises the following steps: Step 1, the method is for the water consumption analysis and calculation of photovoltaic module super-hydrophobic surface liquid drop dust cleaning; Step 2, taking the radius Rm of the liquid drop after cleaning the dust on the surface of the super-hydrophobic coating as input, based on the characteristic number Bo of the liquid drop shape, according to the selected volume Vd=50μL of the liquid drop for dust cleaning, a cubic polynomial of Rm about the mass ms of the dust removed by unit liquid drop rolling is fitted; Step 3, using the mass ms of the dust particles removed by unit liquid drop rolling, the total surface area S of the photovoltaic module and the dust density Rd are input to obtain the number N of liquid drops consumed for cleaning all the dust on the photovoltaic module of the photovoltaic power station; Step 4, based on the proportional relationship between the total dust cleaning water consumption of the photovoltaic module of the photovoltaic power station and the volume of a single liquid drop, the total dust cleaning water consumption V of the photovoltaic module of the photovoltaic power station is calculated.

2. The water consumption analysis and calculation model of photovoltaic dust cleaning with super-hydrophobic coating according to claim 1, characterized in that, The step 1 comprises: Step 11, cleaning the photovoltaic module by rolling the liquid drop to wrap the dust on the surface of the photovoltaic module, and titrating a certain volume of liquid drop above the super-hydrophobic photovoltaic module, the liquid drop will take away the dust particles on the surface in the form of rolling. 3.The water consumption analysis and calculation model of photovoltaic dust cleaning with super-hydrophobic coating according to claim 1, wherein, The step 2 comprises: Step 21, the experiment proves that when Bo=1, the mass of the dust particles contained in the liquid drop after rolling is the highest, and the number of liquid drops required to remove a certain mass of dust is the least.

4. The water consumption analysis and calculation model of photovoltaic dust cleaning with super-hydrophobic coating according to claim 3, characterized in that, The cubic polynomial fitting equation of the radius of the mixed liquid drop and the mass of the dust contained therein with the initial volume Vd of 50μL is shown in formula (1): Where Rm is the radius of the mixed liquid drop, and ms is the mass of the dust removed by the liquid drop rolling.

5. The water consumption analysis and calculation model of photovoltaic dust cleaning with super-hydrophobic coating according to claim 4, characterized in that, The step 2 further comprises: Step 22, measuring the radius Rm of the mixed liquid drop after rolling cleaning the surface to obtain the mass ms of the dust wrapped therein.

6. The water consumption analysis and calculation model of photovoltaic dust cleaning with super-hydrophobic coating according to claim 1, characterized in that, The step 3 comprises: Step 31, calculating the total surface area of the photovoltaic module according to the installed capacity of the photovoltaic power station and measuring the dust density on the surface of the photovoltaic module.

7. The water consumption analysis and calculation model of photovoltaic dust cleaning with super-hydrophobic coating according to claim 1, characterized in that, The formula (2) is as follows:

8. The water consumption analysis and calculation model of photovoltaic dust cleaning with super-hydrophobic coating according to claim 7, characterized in that, The step 3 further comprises: Step 32, according to the radius Rm of the mixed liquid drop and the mass ms of the dust removed by the liquid drop rolling, the number N of liquid drops consumed for cleaning all the dust on the photovoltaic module of the photovoltaic power station is obtained by formula (2).

9. The water consumption analysis and calculation model of photovoltaic dust cleaning with super-hydrophobic coating according to claim 1, characterized in that, The formula (3) is as follows: V = NV d Equation (3).

10. The water consumption analysis model of a photovoltaic dust cleaning with super-hydrophobic coating according to claim 9, wherein, The step 4 comprises: Step 41, multiplying the number N of liquid drops consumed for cleaning all the dust on the photovoltaic module of the photovoltaic power station by the volume Vd=50μL of the unit liquid drop used for cleaning to obtain the water consumption for cleaning all the dust on the photovoltaic module of the photovoltaic power station, which can be calculated by formula (3).

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