JP6667245B2 - Solar panel watering system - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a water spraying system for a solar cell panel, which increases the power generation efficiency of the solar cell panel by watering the solar cell panel.

  In general, as a system using solar energy, which is renewable energy, for example, a solar cell panel can be cited. It is known that the power generation efficiency of a solar cell panel decreases due to a rise in the temperature of a crystalline silicon solar cell (hereinafter, a solar cell). As a method of preventing a decrease in power generation efficiency due to a rise in the temperature of a solar cell, a solar cell panel is separated from a construction surface of the solar cell panel (for example, a roof or the ground) by a predetermined gap (about 5 to 10 cm). An example is a system that arranges and cools solar cells by circulating air between the solar cell panels and the construction surface of the solar cell panels. In addition, there is a system in which water is sprayed using tap water or purified water when the surface temperature of the solar cell panel is equal to or higher than a predetermined temperature, and the solar cell is cooled by evaporation of the sprinkled water. (See Patent Document 1). The method of spraying water when the surface temperature of the solar cell panel is equal to or higher than a predetermined temperature makes the solar cells more efficient than the method of circulating air between the solar cell panel and the construction surface of the solar cell panel. It has the advantage of cooling.

JP 2004-175506 A

  However, for example, in the case of watering using tap water or purified water, the tap water or purified water to be used is expensive, and in the case of tap water, silica and hardness components contained in the tap water are on the surface of the solar cell panel. There is a problem that they adhere and lower the power generation efficiency of the solar cell panel. Further, when watering is performed on the solar cell panel, it is common to use a nozzle. However, in watering using the nozzle, it is difficult to uniformly water the surface of the solar cell panel, and water is sprayed. Water often scatters outside the solar panels. In addition, when the water for watering is once stored in the water storage tank, since the water storage tank is often installed on the ground, the amount of power generation related to the pump that sends out the water for watering from the water storage tank to the solar cell panel increases. . Due to these factors, the amount of energy consumed by watering increases, and the energy efficiency of the entire system is poor.

  In recent years, efforts have been made to reduce the amount of energy consumed throughout the year by the amount of power generated from renewable energy to zero energy.For example, when the surface temperature of a solar panel becomes equal to or higher than a predetermined temperature, The method of watering the panel is not preferable in terms of energy efficiency.

  An object of the present invention is to provide a watering system for a solar cell panel that can maintain good energy efficiency of the entire system for watering the solar cell panel.

In order to solve the above-mentioned problem, the water spraying system for a solar cell panel according to the present invention is disposed at an upstream end in a tilt direction of the tilted solar cell panel, and an upstream end in a tilt direction of the solar cell panel. A sprinkler pipe for spraying water from the portion to the surface of the solar cell panel, a collecting member for collecting water flowing on the surface of the solar cell panel, and water disposed near the solar cell panel and collected by the collecting member A water tank for storing water, a pump for sending water stored in the water tank toward the water sprinkling pipe, and control means for controlling the operation of the pump; panel watering system includes a temperature sensor for detecting the outside air temperature, a solar radiation sensor for detecting an irradiation amount of sunlight, and the solar panels, thick From the light incident surface side, the laminated glass layer, the solar cell layer, and the protective sheet layer are laminated and adhered in this order, and the control unit increases the power generation amount of the solar cell panel, which is increased by watering, and the pump. Whether or not watering is necessary according to the difference value between the power generation amount and the outside air temperature, the outside air temperature, the control data that summarizes the amount of sunlight irradiation as an index, the outside air temperature detected by the temperature sensor and the solar radiation sensor In performing the operation control of the pump based on the irradiation amount of the sunlight detected by the, the necessity of watering based on the outside air temperature and the irradiation amount of the sunlight is determined using the control data, and The operation control of the pump is performed based on the determination result, and the power generation amount of the solar cell panel when watering is performed is a table of the solar cell panel when a certain time has elapsed since the start of watering. Using the temperature of the surface of the tempered glass layer, as a relational expression of the heat balance in the solar cell layer of the solar cell panel, the amount of solar radiation absorbed by the solar cell layer, heat transfer to the tempered glass layer, and protection It is calculated by substituting the temperature of the upper surface of the tempered glass layer into a formula that takes into account the heat transfer to the back side across the sheet, the energy generated by the solar cell layer, and the temperature of the solar cell layer of the solar cell panel. It is characterized by the following.

In addition, the temperature of the surface of the solar cell panel, the temperature of water at the time of watering performed after the elapse of the certain time obtained from the relational expression of the heat balance in the water storage tank, the heat balance of the surface of the solar cell panel and the It is calculated based on a function for the temperature of the surface of the solar cell panel obtained from the relational expression of the heat balance in the solar cell layer of the solar cell panel .
Further, the collecting member is a rain gutter provided over a downstream end in the tilt direction of the solar cell panel and both ends orthogonal to the tilt direction, and the collecting member is configured to collect the sun when the water is sprayed. In addition to collecting water flowing on the surface of the battery panel, it also collects rainwater flowing on the surface of the solar cell panel during rainfall, and the water storage tank has excellent light-shielding properties and transfers heat from the outside air to the stored rainwater. It is characterized by a structure that can be insulated .

  Further, the control data is data in which necessity of watering is summarized by using humidity in the outside air as an index, in addition to the outside air temperature and the irradiation amount of the sunlight.

  In this case, it has a humidity sensor for detecting the humidity in the outside air, and the control means uses the control data to calculate the outside air temperature, the irradiation amount of the sunlight and the humidity of the outside air detected by the humidity sensor. It is characterized in that it is determined whether or not watering is necessary, and the operation of the pump is controlled based on the determination result.

The water spraying system for a solar cell panel according to the present invention is disposed at an upstream end in the tilt direction of the solar cell panel that is inclined, and the solar cell panel is sprayed from the upstream end in the tilt direction of the solar cell panel. A sprinkler pipe that sprays water on the surface, a collecting member that collects water flowing on the surface of the solar cell panel, and a water storage tank that is disposed near the solar cell panel and stores water collected by the collecting member. In a water spraying system for a solar cell panel, comprising: a pump that sends out water stored in the water storage tank toward the water sprinkling pipe; and control means for controlling the operation of the pump. A solar radiation sensor for detecting an irradiation amount of light, wherein the control means increases an amount of power generation of the solar cell panel, which is increased by performing watering, and Control data summarizing the necessity of watering based on a difference value from the power generation amount in the operation of the pump, using the outside air temperature and the amount of sunlight irradiation as indices, and the outside air temperature detected by the temperature sensor and the insolation. In performing the operation control of the pump based on the irradiation amount of the sunlight detected by the sensor, it is determined whether or not watering is necessary based on the outside air temperature and the irradiation amount of the sunlight using the control data, Perform the operation control of the pump based on the determination result, the power generation amount of the solar cell panel when watering is performed, the surface temperature of the solar cell panel when a certain time has elapsed since the start of watering, and It is calculated by using the internal temperature of the solar cell panel calculated from the relational expression of the heat balance inside the solar cell panel, and the temperature of the surface of the solar cell panel is the water storage tank. The temperature of water at the time of watering performed after the elapse of the predetermined time obtained from the relational expression of the heat balance in the solar cell, the heat balance on the surface of the solar cell panel and the relation between the heat balance inside the solar cell panel. It is calculated based on a function with respect to the temperature of the surface of the solar cell panel .

  ADVANTAGE OF THE INVENTION According to this invention, the energy efficiency of the whole system which waters a solar cell panel can be kept favorable.

It is a schematic diagram of the watering system of the solar cell panel of this invention. It is sectional drawing of a solar cell module. It is a table | surface which summarized the value of (DELTA) P-Q when it is made into the increase (DELTA) P of the electric power generation amount of the solar cell panel by watering, and the electric power generation amount Q of the pump operated by watering for every outside temperature. It is a graph which shows an example of a control map. It is a flowchart which shows operation | movement of a watering system.

  Hereinafter, a watering system for a solar cell panel will be described. As shown in FIG. 1, the solar cell panel 10 is installed on the roof of a building or the roof of a house with a plurality of solar cell modules 10a arranged in an array. FIG. 1 shows an example of a solar cell panel 10 in which a total of eight solar cell modules 10a of 2 × 4 are arranged. The solar cell panel 10 is installed at an angle of, for example, 10 ° in the longitudinal direction of the solar cell panel 10 so that sunlight is vertically incident on each of the solar cell modules 10a. As an example, the solar cell module 10a used for the solar panel 10 has a size of 1559 mm × 798 mm and a maximum output of 250 W. Note that reference numeral 11 denotes a mount for installing the solar cell panel 10 in an inclined state.

  A rain gutter 15 is provided on the outer peripheral portion of the solar cell panel 10. The rain gutter 15 includes eaves gutters 16a, 16b, 16c, a water collector 17, a vertical gutter 18, a call gutter 19, and the like. The eaves gutters 16a and 16b are arranged at both ends in the short direction of the solar cell panel 10 along the longitudinal direction of the solar cell panel 10. In other words, the eaves gutters 16a and 16b are arranged at an angle of 10 ° like the solar cell panel 10. The eaves gutter 16c has a shape inclined toward the water collector 17 attached near the right end in FIG. 1 in the longitudinal direction. Both ends of the eaves gutter 16c are connected to downstream ends of the eaves gutters 16a and 16b, respectively. Therefore, the rainwater received (collected) by the eaves gutters 16a and 16b flows from the eaves gutters 16a and 16b to the eaves gutter 16c.

  These eaves gutters 16a, 16b, 16c directly receive rainwater during rainfall, and also flow along the surface of the solar cell panel 10 and receive rainwater flowing down from the periphery of the solar cell panel 10. The eaves gutters 16a, 16b, and 16c receive rainwater that flows along the surface of the solar cell panel 10 and flows down from the peripheral edge of the solar cell panel 10 when water is sprinkled through the drain pipe 22. The water collector 17 collects rainwater received by the eaves gutters 16a, 16b, and 16c and flows the rainwater into the downspout 18. The rainwater that has flowed into the downspout 18 flows into a water storage tank 20 via a call gutter 19 connected to the downspout 18.

  The water storage tank 20 stores the rainwater received by the rain gutter 15. The water storage tank 20 is installed on the side of the solar cell panel 10. The water storage tank 20 is made of stainless steel having excellent light-shielding properties, but may have a structure that can insulate heat from outside air against stored rainwater. The pump 21 is provided to send out rainwater stored in the water storage tank 20 to the sprinkling pipe 22. Reference numeral 23 denotes a pipe connecting the water storage tank 20 and the pump 21, and reference numeral 24 denotes a pipe connecting the pump 21 and the water sprinkling pipe 22.

  The water sprinkling pipe 22 is installed at the upstream end in the tilt direction of the solar cell panel 10. The width of the water sprinkling pipe 22 in the longitudinal direction is provided so as to substantially coincide with, for example, the width of the solar cell panel 10 in a direction orthogonal to the inclination direction. As the water sprinkling pipe 22, for example, a rubber hose or a porous rubber hose having holes formed at predetermined intervals is used. The water sprinkling pipe 22 sprinkles rainwater sent out by the pump 21 from the upstream end in the tilt direction of the solar cell panel 10. Here, since the sprinkling performed in the present embodiment uses rainwater, it is possible to prevent silica and hardness components contained in tap water from adhering and remaining on the surface of each solar cell module 10a, and these residues Thereby, it is possible to prevent a decrease in power generation efficiency in each solar cell module 10a.

The temperature sensor 26 detects the outside air temperature and outputs a detection signal to the controller 30. The solar radiation sensor 27 detects the amount of solar radiation (irradiation) of the sunlight, and outputs a detection signal to the controller 30. The humidity sensor 28 detects the relative humidity in the outside air and outputs a detection signal to the controller 30. Controller 30, the detection signal from the temperature sensor 26, solar radiation sensor 27 and the humidity sensor 28, an outside air temperature _{t 0,} obtains the relative humidity RH ₀ in insolation _{G T} and the outdoor air, the relative humidity RH ₀ and ambient temperature _{t 0} calculates the absolute humidity x ₀ in the outside air. The controller 30 determines that the outside air temperature t _0, the amount of solar radiation G _T and relative humidity RH ₀ in ambient air as determined by using a control map 35 to be described later, the necessity of watering. Then, the controller 30 controls the operation of the pump 21 based on the determination of the necessity of watering.

  The controller 30 has a control map 35. The control map 35 is data in which the necessity of watering the solar cell panel 10 is mapped. More specifically, the control map 35 calculates a difference value between the increase in the amount of power generation of the solar cell panel 10 due to watering and the amount of power generation related to the pump 21 that is activated when watering is performed. In this case, the data are summarized as “with watering” and when the difference value is negative, as “without watering”. The control map 35 is created in advance by calculating a theoretical value based on the specifications of the solar cell panel 10, the water sprinkling pipe 22, and the pump 21, and then stored in the controller 30. The control map 35 is created from theoretical values calculated based on the specifications of the solar cell panel 10, the water sprinkling pipe 22, and the pump 21. For example, the control map 35 is controlled based on a test result using the solar cell panel 10. The map 35 may be created. The control map 35 may be stored in a storage unit of the controller or a storage medium electrically connected to the controller, in addition to being stored in the controller 30 in advance.

  As shown in FIG. 2, the solar cell module 10a has a structure in which a tempered glass layer 36, a solar cell layer (PV layer) 37, and a protective sheet layer 38 are stacked in this order from the incident surface side of sunlight. Although not described in detail, the solar cell layer 37 has a structure in which a plurality of solar cells made of, for example, single-crystal silicon are two-dimensionally arranged, and these solar cells are connected by an interconnector or the like. . As described above, in the present embodiment, the pump 21 is operated to sprinkle the rainwater stored in the water storage tank 20 from the upstream end in the tilt direction of the solar cell panel 10 via the water sprinkling pipe 22. When rainwater is sprinkled, the rainwater flows on the surface of each solar cell module 10a, and generates a rainwater layer 40 due to water sprinkling. Part of the rainwater sprinkled on the solar cell panel 10 evaporates in the process of flowing on the surface of the solar cell module 10a, and the rainwater evaporates to cool the solar cell module 10a. Rainwater that does not evaporate when flowing on the surface of the solar cell module 10a is collected in the water storage tank 20 as return water.

  As described above, the control map 35 is created by calculating a theoretical value based on the specifications of the solar cell panel 10, the water sprinkling pipe 22, and the pump 21. First, the theoretical value of the amount of power generated by the solar cell panel 10 is obtained by considering the heat balance in the solar cell panel 10. The heat balance in the solar cell panel 10 includes the heat balance in the surface S1 of the solar cell module 10a (the surface of the tempered glass layer 37) and the heat balance in the solar cell layer 37.

On the surface S1 of the tempered glass layer 36, heat due to irradiation of sunlight (insolation in FIG. 2) and heat flowing out of the tempered glass layer 36 to the solar cell layer 37 are generated. When water is sprayed on the solar cell module 10a, heat generated when the rainwater flowing on the surface S1 of the tempered glass layer 36 evaporates, and convective heat generated between the rainwater flowing on the surface S1 of the tempered glass layer 36 and the outside air are generated. I do. Therefore, the heat balance on the surface S1 of the solar cell module 10a includes the solar heat absorbed by the tempered glass 36, the heat transfer from the solar cell 37 (the first and sixth terms of the following formula (1)), Convective heat transfer due to the temperature difference between the water temperature t _{1 on} the panel surface of the battery panel 10 and the outside air temperature t ₀ , radiant heat transfer from the water surface, and heat transfer due to the transfer of substances (water evaporation) from the water surface to the air. (The second and third terms of the following formula (1)) and the heat transfer between the water and the panel surface of the solar cell panel 10 expressed as the difference between the sensible heat of the sprinkling water and the sensible heat of the return water (the following ( It is expressed by the following equation (1) considering the fourth and fifth terms of the equation (1).

ｔ_０：外気温
ｘ_０：外気の絶対湿度
ｉ_０：外気のエンタルピー
ｔ_１：強化ガラス層３６の表面Ｓ１の温度
ｘ_１：強化ガラス層３６の表面Ｓ１における飽和絶対湿度
ｉ_１：強化ガラス層３６の表面Ｓ１のエンタルピー
ａ_１：強化ガラスにおける日射吸収率
ｋ_１：強化ガラス層３６の表面Ｓ１におけるエンタルピーの基準総括熱伝達率
Ｇ_Ｔ：日射量
α_ｒｏ：強化ガラス層３６の表面Ｓ１における熱対流熱伝達率
Ｃ_ｐｗ：水の比熱
Ｌ_Ｓ：散水量
Ｌ_Ｅ：戻り水量
Ｋ_１２：強化ガラスにおける熱コンダクタンス

t ₀ : outside air temperature x ₀ : absolute humidity of outside air i ₀ : enthalpy of outside air t ₁ : temperature of surface S1 of tempered glass layer 36 x ₁ : saturation absolute humidity at surface S1 of tempered glass layer 36 i ₁ : tempered glass layer 36 enthalpy a ₁ of the surface S1 of: solar absorptance k ₁ in tempered glass: the reference overall heat transfer coefficient of the enthalpy at the surface S1 G _T of the tempered glass layer 36: insolation alpha _ro: heat at the surface S1 of the tempered glass layer 36 convective heat transfer coefficient C _pw: specific heat of water L _S: watering amount L _E: return water K _12: thermal conductance in tempered glass

  Next, the heat balance in the solar cell layer 37 is considered. In the solar cell layer 37, heat flowing from the tempered glass layer 36, heat due to sunlight passing through the tempered glass layer 36 and reaching the solar cell layer 37, and heat radiated to the protective sheet layer 38 are generated. In addition, it is necessary to consider the power generation amount in the solar cell. Therefore, the heat balance in the solar cell layer 37 is determined by the solar radiation absorbed by the solar cell 37, the heat transfer to the tempered glass 36 (the first and third terms of the following formula (2)), and the protection sheet 38. The following equation (2) takes into account the heat transfer to the backside (the second term of the following equation (2)), the energy generated by the solar cell 37 and the (fourth term of the following equation (2)). Is represented.

ｔ_２：太陽電池層３７の温度
Ｋ_２３：保護シートにおける熱コンダクタンス
α_ｃｏ’：保護シート層３８の裏面Ｓ２における対流熱伝達率
α_ｒｏ’：太陽電池モジュール１０ａの裏面Ｓ２における放射熱伝達率
ａ_２：太陽電池セルの日射吸収率
τ_１：強化ガラス層３６の日射吸収率
Ｐ：太陽電池セルにおける発電量

t ₂ : Temperature of the solar cell layer 37 K ₂₃ : Thermal conductance of the protective sheet α _co ′: Convective heat transfer coefficient of the back surface S2 of the protective sheet layer α _ro ′: Radiant heat transfer coefficient of the back surface S2 of the solar cell module 10a a ₂ : solar absorptance of solar cell τ ₁ : solar absorptivity of tempered glass layer 36 P: power generation in solar cell

In the above equations (1) and (2), the solar absorptance a ₁ of the tempered glass layer 36, the specific heat C _{pw of} the water, the thermal conductance K ₁₂ of the tempered glass, the thermal conductance K ₂₃ of the protective sheet, and the solar cell module 10a radiative heat transfer coefficient alpha _ro on the rear surface S2 of 'solar absorptance tau ₁ in solar absorptance a _2, tempered glass layer 36 in the solar cell layer _37, the water spray amount L _S is the known value.

a ₁ = 0.05
C _pw = 4177J / (kg · K)
K ₁₂ = 236.25 W / (m ² · K)
K ₂₃ = 3.0 W / (m ² · K)
α _ro '= 4.65 W / (m ² · K)
a ₂ = 0.85
τ ₁ = 0.9
L _S = 0.005 kg / (m ² · s)

Here, it is considered that the convective heat transfer coefficient α _co ′ of the back surface S2 of the solar cell module 10a is the same as the heat convective heat transfer coefficient α _{ro of the front} surface S1 of the solar cell module 10a. As a result, in the above-described (1) and (2), the unknown values, the reference overall heat transfer coefficient _{k 1} of the enthalpy at the surface S1 of the solar cell module 10a, the return water _{L E,} the surface of the solar cell module 10a convection heat transfer coefficient in the S1 alpha _ro, the water temperature t _w of the power generation amount P, rainwater is sprinkled in the solar cell.

Of unknown values described above, the reference overall heat transfer coefficient k ₁ of the enthalpy at the surface S1 of the solar cell module 10a is expressed by the following equation (3).

Ｃ_ｐａ：外気の定圧比熱
Ｃ_ｐｖ：水蒸気の定圧比熱
ｕ：外気の風速

C _pa : constant pressure specific heat of outside air C _pv : constant pressure specific heat of steam u: wind speed of outside air

The constant pressure specific heat C _{pa of the} outside air, the constant pressure specific heat C _{pv of the} steam, and the wind speed u of the outside air are known values as shown below.

C _pa = 1006J / (kg · K)
C _pv = 1805J / (kg · K)
u = 3m / s

Here, the return water _{L E} is expressed by the following equation (4). The equation (4), from Lewis relationship, the evaporation amount obtained by multiplying the reference overall heat transfer coefficient from the saturated absolute humidity x ₁ minus the absolute humidity x ₀ of the outside air of the panel surface S1 of the solar cell panel 10, This is a mass balance equation that is equal to the evaporation amount obtained by subtracting the return water amount from the watering amount.

Ｍ：蒸発量
太陽電池モジュール１０ａの表面Ｓ１の熱対流熱伝達率α_ｒｏは、（５）式で表わされる。

M: Evaporation amount The heat convection heat transfer coefficient α _ro of the surface S1 of the solar cell module 10a is represented by the equation (5).

φ：傾斜面に対する形態係数
ε_１：太陽電池層３７の放射率
ε_０：外気における放射率
δ：ステファンボルツマン係数
Ｔ_０：外気の絶対温度
Ｔ_１：太陽電池モジュール３７の表面Ｓ１の絶対温度

φ: View factor for inclined surface ε ₁ : emissivity of solar cell layer 37 ε ₀ : emissivity in outside air δ: Stefan-Boltzmann coefficient T ₀ : absolute temperature of outside air T ₁ : absolute temperature of surface S1 of solar cell module 37

Here, the form factor φ with respect to the inclined surface, the emissivity ε ₁ of the solar cell layer 37, the emissivity ε ₀ in the outside air, and the Stefan-Boltzmann coefficient δ are known values as shown below.
φ = 0.985
ε ₁ = 0.9
ε ₀ = 1.0
δ = 5.67 × 10 ⁻⁸ W / (m ² · K ⁴ )

  The power generation amount P in the solar cell layer is represented by the following equation (6).

Ｐ_ｒｅｆ：最大発電量
Ｒ：温度係数
なお、温度係数Ｒは、Ｒ＝０．４％／℃である。

P _ref : Maximum power generation amount R: Temperature coefficient Note that the temperature coefficient R is R = 0.4% / ° C.

Next, the temperature _{t 1} of the surface S1 of the solar cell module 10a, the relationship between the saturated absolute humidity _{x 1} surface S1 of the solar cell module 10a, using the formula Tetensu is calculated by equation (7).

Therefore, x ₁ ′ is obtained by equation (8).

また、太陽電池モジュール１０ａの表面におけるエンタルピーｉ_１と太陽電池モジュール１０ａの表面Ｓ１の温度ｔ_１との関係は（９）式で求められる。

The relationship between the temperature _{t 1} of the surface S1 of the enthalpy _{i 1} and the solar cell module 10a in the surface of the solar cell module 10a is calculated by equation (9).

Therefore, i ₁ ′ is obtained by equation (10).

Here, by modifying the above-mentioned (2), the relationship between the temperature t ₁ of the surface S1 of the surface temperature t ₂ and the solar cell module 10a of the solar cell layer 37 is determined by equation (11). Consider _Here, since the _{K 12 »β,} a _{K 12 -β} ≒ _{K 12.}

  Equation (1) is represented by equation (12) by substituting equation (11).

  In the system for watering the solar cell panel 10 shown in the present embodiment, it is necessary to consider the heat balance in the water storage tank 20. As described above, the water storage tank 20 has a structure in which heat from outside air is insulated. Therefore, the heat balance in the water storage tank 20 is based on the change in the temperature of the collected rainwater. The heat balance in the water storage tank 20 is represented by Expression (13).

Ａ：太陽電池パネル１０の総面積
ｎ：経過時間（秒）
Ｖ^＊：ｎ秒後の貯水タンク２０における貯水量
ｔ_ｗ ^＊：ｎ秒後に散水される雨水の水温

A: Total area of solar cell panel 10 n: Elapsed time (second)
V ^* : Water storage amount in the water storage tank 20 after n seconds _tw ^* : Water temperature of rainwater sprinkled after n seconds

Here, assuming that the amount of water stored in the water storage tank 20 is constant, the water temperature _tw ^{* of the} rainwater sprinkled after n seconds is expressed by Expression (14) by modifying Expression (13). In the equation (14), the value obtained by subtracting the heat quantity of the water flowing into the panel surface of the solar cell panel 10 from the heat quantity of the return water flowing out from the panel surface of the solar cell panel 10 for n seconds is the value of the water storage tank 20. It is an equation of the heat balance in the water storage tank 20 by becoming equal to the change in the amount of heat.

Temperature of the surface S1 of the tempered glass layer 37 when performing watering is the same value as the temperature t ₁ of the return water. Therefore, to obtain the water temperature t ₁ of the return water would determine the temperature t ₁ of the surface S1 of the tempered glass layer 37 when performing watering. Here, a function f (t ₁ ) of the temperature t ₁ of the surface S1 of the tempered glass layer 37 when watering is performed is represented by the following equation (15).

Further, a differential function f (t ₁ ) ′ of the function f (t ₁ ) of the temperature t ₁ of the surface of the tempered glass layer 37 is represented by Expression (16).

Therefore, the temperature t ₁ ^* of the return water after n seconds can be obtained by substituting the equations (15) and (16) into the equation (17) used in the Newton method.

ｒ：緩和係数
ここで、緩和係数ｒはｒ＝０．５に設定される。

r: relaxation coefficient Here, the relaxation coefficient r is set to r = 0.5.

Further, the water temperature _tw ^{* of the} rainwater sprinkled after n seconds has elapsed is calculated from the equation (14). Thus, the n seconds elapsed after the return water temperature _t ^{1 *,} repeatedly calculates a water temperature _t ^{w *} of rainwater to be watered after n seconds until _t p = 3600s.

Generally, rainwater is sprinkled is changed by the water temperature t ₁ is the temperature and environmental conditions of the surface of the solar cell panel 10 during sprinkling return water when it is collected in the reservoir tank 20. This change in the return water of the water temperature t _1, not only the temperature of rainwater is stored in the water storage tank, affect the temperature t _w of rainwater to be sprinkled from sprinkling pipe 22. That is, the change of the water temperature t _w of rainwater to be sprinkled from sprinkling pipe 22, changes the amount of evaporation of it flows over the surface of the solar cell panel 10, thus resulting in affecting the power generation efficiency of the solar cell panel 10 .

Accordingly, the rain water temperature _t ^{w *} and the return water temperature _t ^{1 *} and which is sprinkled required for n = every 600 seconds, for example _t p = until the end of 3600 seconds, the water temperature _t ^w of rainwater to be sprinkled ^* And the temperature of the return water t ₁ ^* . As a result, the water temperature t _w ^* of rainwater to be sprinkled, the water temperature t _{1 *} of the return water ^can be determined whether the converged respectively. _Further, the water temperature _t ^{1 *} of return water when the elapsed t p = 3600 seconds using the equation (11), calculates the temperature _t ^{2 *} of the solar cell layer. From the calculated solar cell layer temperature t ₂ ^* and the equation (6), the power generation amount P1 of the solar cell panel 10 when watering is performed is obtained. Therefore, it is possible to more finely estimate the power generation amount of the solar cell panel 10 based on the change in the temperature of the sprinkled rainwater.

_Also, to that with t p = 3600 seconds, to do the actual watering the solar cell panel 10, detection of the outside air temperature _{t 0} by the temperature sensor 26, detects the amount of solar radiation _{G T} by solar radiation sensor 27, humidity the detection of relative humidity RH ₀ in the outside air by the sensor 28 because performed every time after one hour. However, since the water temperature t _w ^* of the fluctuation width of the rainwater during watering for a period shorter t p ₌ 3600 seconds is also assumed if equal to or less than a predetermined value, in such a case, the water temperature of the rainwater during watering Using the temperature t ₁ ^* of the return water when the fluctuation width of _tw ^* is equal to or less than a predetermined value, the temperature t ₂ ^* of the solar cell layer and the power generation amount P1 of the solar cell panel 10 when watering is performed. Just ask.

Next, determine the temperature t ₁ of the surface of the tempered glass layer 36 when not watering. In this case, the watering amount and the return water amount are zero. Therefore, the function f (t ₁ ) of the temperature t ₁ of the surface S1 of the tempered glass layer 36 when water is not sprayed is represented by the expression (18).

In addition, a differential function f (t ₁ ) ′ of the function f (t ₁ ) of the temperature t ₁ of the surface S1 of the tempered glass layer 36 is expressed by Expression (19).

In this case, determining the surface S1 temperature t ₁ of the tempered glass layer 36 when not carried out, the water spray using the equation (17). And a water temperature _{t 1} of the surface S1 of the tempered glass layer 36 and (11) determine the temperature _{t 2} of the solar cell layer 37. Moreover, obtaining the power generation amount P2 of the solar cell panel 10 when no watering and a temperature t ₂ of the solar cell layer 37 and (6).

Incidentally, the power generation amount P2 of the solar cell panel 10 when not performing the power generation amount P1 and watering when performing watering obtains the relative humidity RH 0 in the outside _air, the outside air temperature t _0, the amount of solar radiation G _T as the following values .

Relative humidity RH ₀ : 20% RH, 60% RH, 100% RH
Outside air temperature t ₀ : 4 ° C, 10 ° C, 20 ° C, 30 ° C, 40 ° C
Solar radiation G _T : 100, 200, 300..., 1000 W / m ²

Next, it is calculated under each condition whether or not the increase ΔP (= P1−P2) in the power generation amount of the solar cell panel 10 due to water spraying is larger than the power generation amount Q related to the operation of the pump 21. Figure 3 is an absolute humidity x ₀ of the outside air the difference value of the power generation amount Q and the increment ΔP of the power generation amount, a summary of the amount of solar radiation G _T as an index.

Hereinafter, the necessity of watering will be described. In the following, the value of ΔP-Q when the relative humidity RH _{0 of the} outside air is 60% RH is used as a reference. As shown in FIG. 3, when the outside air temperature is set to 4 ° C., when the relative humidity RH ₀ in the outside air is 100% RH and the amount of solar radiation is 0.8 kW / m ² or more, the value of ΔP-Q increases. Value. Also, the RH outside air relative humidity RH ₀ is 40% RH, 60%, when the solar radiation amount is 0.7 kW / ^{m 2} or more, the value of [Delta] P-Q is a positive value. Here, in an environment where the outside air temperature is low, the power generation efficiency in the solar cell panel 10 tends to decrease as the amount of solar radiation increases. Therefore, when the outside air temperature is set to 4 ° C., the value of ΔP-Q at the time when the relative humidity RH _{0 of the} outside air is 60% RH is not a positive solar radiation amount of 0.7 kW / m ² , but the outside air relative humidity. It is recommended to spray water when the humidity RH ₀ is 100% RH and the amount of solar radiation at which the value of ΔP-Q is a positive value is 0.8 kW / m ² or more.

When the outside air temperature is set to 10 ° C., when the relative humidity RH _{0 of the} outside air is 60% RH and at 100% RH, when the amount of solar radiation is 0.7 kW / m ² or more, the value of ΔP-Q is 0 or plus. Value. When the relative humidity RH _{0 of the} outside air is 40% RH, the value of ΔP-Q becomes a positive value when the amount of solar radiation is 0.6 kW / m ² or more. As described above, since the outdoor air relative humidity RH ₀ is a reference value of [Delta] P-Q when the RH 60%, the ambient temperature is 10 ° C., ambient air relative humidity RH ₀ is when the RH 60% [Delta] P It is recommended that water spraying be performed when the amount of solar radiation at which the value of −Q is a positive value is 0.7 kW / m ² or more.

When the outside air temperature is set at 20 ° C., when the relative humidity RH _{0 of the} outside air is 100% RH, the value of ΔP-Q becomes a positive value when the amount of solar radiation is 0.7 kW / m ² or more. Further, when the relative humidity RH _{0 of the} outside air is 60% RH, the value of ΔP-Q becomes a positive value when the amount of solar radiation is 0.6 kW / m ² or more. Further, when the relative humidity RH _{0 of the} outside air is 40% RH, the value of ΔP-Q becomes a positive value when the amount of solar radiation is 0.5 kW / m ² or more. As described above, since the value of ΔP-Q when the relative humidity RH ₀ of the outside air is 60% RH is used as a reference, when the outside temperature is set to 20 ° C., the relative humidity RH _{0 of the} outside air is 60% RH. It is recommended that water spraying be performed when the amount of solar radiation at which the value of ΔP-Q at that time is a positive value is 0.6 kW / m ² or more.

When the outside air temperature is set to 30 ° C., when the relative humidity RH _{0 of the} outside air is 100% RH, when the amount of solar radiation is 0.7 kW / m ² or more, the value of ΔP-Q becomes a positive value. Further, when the relative humidity RH _{0 of the} outside air is 60% RH, the value of ΔP-Q becomes a positive value when the amount of solar radiation is 0.6 kW / m ² or more. Further, when the relative humidity RH _{0 of the} outside air is 40% RH, the value of ΔP−Q becomes 0 when the amount of solar radiation is 0.4 kW / m ² . Here, when the outside air temperature is high, even if the amount of solar radiation is low, the temperature of the solar cell panel 10 is high, and the power generation efficiency in the solar cell panel 10 is reduced. Therefore, when the outside air temperature is set to 30 ° C., the value of ΔP-Q when the relative humidity RH _{0 of the} outside air is 60% RH is not a positive value of the solar radiation amount 0.6 kW / m ² , but the relative value of the outside air. It is recommended to spray water when the solar radiation amount is 0.4 kW / m ² or more, at which the value of ΔP-Q when the humidity RH ₀ is 40% RH is a positive value.

When the outside air temperature is set to 40 ° C., when the relative humidity RH _{0 of the} outside air is 100% RH, the value of ΔP-Q becomes a positive value when the amount of solar radiation is 0.7 kW / m ² or more. Further, when the relative humidity RH _{0 of the} outside air is 60% RH, the value of ΔP−Q becomes 0 when the amount of solar radiation is 0.5 kW / m ² . In the case of RH outside air relative humidity RH ₀ 40%, when the solar radiation amount is 0.4kW / ^{m 2} or more, the value of [Delta] P-Q is a positive value. Similarly to the case where the outside air temperature is set to 30 ° C., when the outside air temperature is high, even if the amount of solar radiation is low, the temperature of the solar cell panel 10 is high, and the power generation efficiency in the solar cell panel 10 is reduced. Therefore, when the outside air temperature is set to 40 ° C., the value of ΔP-Q when the relative humidity RH _{0 of the} outside air is 60% RH is not a positive value of the solar radiation 0.5 kW / m ² , but the relative value of the outside air. It is recommended to spray water when the solar radiation amount is 0.4 kW / m ² or more, at which the value of ΔP-Q when the humidity RH ₀ is 40% RH is a positive value.

In order to increase the amount of power generated by the solar cell panel 10, it is preferable to lower the lower limit of the amount of solar radiation that can operate the pump when the power balance is 0 or more at the same outside temperature. The power balance if the same amount of solar radiation that is preferably lowered by the pump can be the lower limit of the temperature t ₀ of the operable ambient air or equal to 0.

For example, when the relative humidity RH _{0 of the} outside air is RH 60%, the boundary where the power balance becomes 0 is between 0.5 and 0.7 in the amount of solar radiation, and 0.5 is the lowest value. When 0.5, the power balance is 0, and since the outside air temperature is 40 ° C., the outside air temperature hardly satisfies such a condition. Therefore, it is set to 0.6 or 0.7.

  When the amount of solar radiation is 0.6, and when the outside air temperature is 20 or 30 ° C., the electric power balance is 0 or more, so the lowest 20 ° C. is preferable.

  When the amount of solar radiation is 0.7, and when the outside air temperature is 4, 10 ° C., the power balance is 0 or more, the lowest 4 ° C. is preferable.

  Accordingly, two candidates having an insolation of 0.7 or more and an outside air temperature of 4 ° C. or more, and an insolation of 0.6 or more and an outside air temperature of 20 ° C. or more are appropriately selected in consideration of local outdoor air conditions and the like. In this case, for example, of the two conditions described above, a condition is selected in which the difference from the annual average temperature in the installation area where the solar cell panel 10 is installed is the smaller outside temperature.

FIG. 4 shows an example of a control map based on the results of FIG. In Figure 4, the horizontal axis represents the amount of solar radiation G _T, the vertical axis represents the ambient temperature t _0. The area indicated by hatching is an area indicating "with water spray".

As shown in FIG. 4, when the relative humidity RH ₀ in the outside air is 20% RH (± 20% RH), if the relative humidity RH ₀ is in the hatched area on the right side of the two-dot chain line, it is determined that “water spray is present” and the pump 21 Is activated. Further, when the relative humidity RH ₀ in the outside air is 60% RH (RH ± 20% ) , when also the bold lines on the right side of the hatched area, it is determined that "there watering", the pump 21 is activated. Further, when the relative humidity RH ₀ in the outside air exceeds 80%, if the right-hand hatched area than fine line, it is determined that "there watering", the pump 21 is activated.

  Next, the procedure for spraying rainwater will be described with reference to the flowchart of FIG.

In step S101, the solar radiation sensor 27 detects the amount of solar radiation. When the amount of solar radiation is detected by the solar radiation sensor 27, a detection signal is transmitted to the controller 30. Controller 30, the detection signal from the solar radiation sensor 27, and calculates the amount of solar radiation G _T of sunlight.

In step S102, the controller 30, insolation _{G T} of sunlight exceeds 0 determines _(G T> 0) or. If the nighttime sun is sinking, the amount of solar radiation G _T of sunlight is zero. Meanwhile, during the day because of rising sun, the solar radiation G _T solar exceed 0. Therefore, by performing the process of step S102, it is determined whether or not it is during the day. For example, when it is determined that the solar radiation G _T > 0, the process proceeds to step S103. On the other hand, when it is determined that the solar radiation G _T = 0, the process proceeds to step S112.

In step S103, the temperature sensor 26, to detect the outside air temperature _{t 0.} When the outside air temperature is detected by the temperature sensor 26, a detection signal is transmitted to the controller 30. Controller 30, the detection signal from the temperature sensor 26, and calculates the ambient temperature _{t 0.}

In step S104, the humidity sensor 28 detects the outside air relative humidity RH _0. When the relative humidity RH _{0 in the} outside air is detected by the humidity sensor 28, a detection signal is transmitted to the controller 30. Controller 30, the detection signal from the humidity sensor 28, and calculates the absolute humidity x ₀ in the outside air.

In step S105, the controller 30 reads the control map 35. Then, the controller 30 determines solar insolation G _T, and absolute humidity x ₀ at ambient temperature t ₀ and the outside air, by referring to the control map 35, the necessity of watering.

  In step S106, when watering is necessary, the controller 30 sets the result of the determination process to Yes. In this case, the process proceeds to step S107. On the other hand, when watering is not necessary, the controller 30 sets the result of the determination process to No. In this case, the process proceeds to step S109.

  In step S107, the controller 30 determines whether the pump is operating. If the pump 21 is operating, the controller 30 sets the determination result to Yes and proceeds to step S111. On the other hand, when the pump 21 is not operating, the controller 30 makes a determination result of No, and proceeds to step S108.

  In step S108, the controller 30 operates the pump 21. When the pump 21 operates, the rainwater stored in the water storage tank 20 is sprinkled on the solar cell panel 10. By spraying rainwater, the solar cell panel 10 is cooled. After the processing of step S108 is performed, the process proceeds to step S111.

  If it is determined in step S106 that watering is not necessary, the process proceeds to step S109. The processing in step S109 is the same as the processing in step S107. If the pump 21 is operating, the controller 30 makes the determination result Yes, and proceeds to step S110. On the other hand, if the pump 21 is not operating, the controller 30 sets the determination result to No, and proceeds to step S111.

  In step S110, the controller 30 stops the operating pump 21. By stopping the pump 21, the sprinkling of rainwater is stopped. When the process in step S110 is performed, the process proceeds to step S111.

  In step S111, the controller 30 determines whether a certain time has elapsed. If the certain time has elapsed, the controller 30 sets the result of the determination process to Yes. In this case, the process returns to step S101. On the other hand, if the fixed time has not elapsed, the controller 30 sets the result of the determination process to No. In this case, the process of step S111 is repeatedly executed. Note that the fixed time is, for example, one hour.

On the other hand, in step S102 described above, if it is determined not to be insolation _G T> 0, the process proceeds to step S112.

  Step S112 is processing to determine whether or not the pump is operating. The process of step S112 is the same process as steps S107 and S109. If the pump 21 is operating, the controller 30 makes the determination result Yes, and proceeds to step S113. On the other hand, when the pump 21 is not operating, the controller 30 sets the determination result to No. In this case, the process returns to step S101.

  In step S113, the controller 30 stops the operating pump 21. By stopping the pump 21, the sprinkling of rainwater is stopped. After this process, the process returns to the process of step S101.

Thus, the processing of steps S101 and S102 are executed, insolation _{G T} by sunlight when the _G T> 0, the processing in step S103~ step S111 is repeatedly executed. Therefore, during the period from morning to evening, watering using rainwater is performed on the solar cell panel 10 as necessary. In addition, by detecting the amount of solar radiation and the outside air temperature at fixed time intervals, it is possible to execute watering corresponding to weather conditions on the solar cell panel 10. As a result, the amount of power generation for operating the pump 21 can be borne by the increase in the amount of power generation of the solar cell panel 10 that is increased by performing watering, and the watering of the solar cell panel 10 and the solar cell panel 10 can be performed. It is possible to improve the energy efficiency of the entire system.

  Further, when the control map is created, the return water temperature can be calculated in consideration of the temporal change in the watering temperature, so that it is possible to accurately estimate the increase in the power generation amount of the solar cell panel 10 due to the watering. There is an advantage that you can.

  Further, in the watering system of the present embodiment, rainwater is stored in the water storage tank 20 using the solar cell panel 10, and water is sprayed on the solar cell panel 10 using the stored rainwater, thereby using tap water. It is possible to reduce the cost incurred. In addition, tap water contains silica and hardness components, and if tap water is used as it is, silica and hardness components will adhere to and remain on the surface of the solar cell panel 10. As a result, the power generation efficiency of the solar cell panel 10 decreases. In addition, when tap water is used, a device for removing (purifying) silica and hardness components is required. In the present embodiment, since the stored rainwater is used, there is no possibility that silica or a hard component adheres or remains on the surface of the solar cell panel 10, and it is possible to prevent a decrease in the power generation efficiency of the solar cell panel 10. Further, since a device for removing (purifying) silica or a hard component is not required, a watering system can be provided at low cost.

In the present embodiment, the control map 35 uses the amount of sunlight G _T and the outside air temperature t ₀ as indices, and summarizes the relative humidity RH _{0 in the} outside air for each of x ₀ = 20% RH, 60% RH, and 100% RH. One map is used. However, it is also possible to create the control map 35 with the relative humidity RH ₀ as a fixed value.

Consider a case where the above-described solar cell panel 10 and the watering system of the solar cell panel 10 are installed in a Japanese house. The average humidity in Japan is, for example, 60%. Therefore, a control map in which the relative humidity RH ₀ in the outside air is fixed at RH ₀ = 60% RH may be used. In this case, the configuration of the humidity sensor 28 shown in FIG. 1 can be omitted.

In the present embodiment, the control map 35 uses the amount of sunlight G _T and the outside air temperature t ₀ as indices, and calculates the relative humidity RH _{0 in the} outside air for each RH ₀ = 20% RH, 60% RH, and 100% RH. Although a single map summarizing, the control map as an index of sunshine G _T and an outside air temperature t _0, may be prepared absolutely every humidity x ₀ in the outside air.

In the present embodiment, the control map 35 determines whether or not the increase in the power generation amount of the solar cell panel 10 when watering is performed exceeds the power generation amount of the pump 21 that is operated when watering is performed. and G _T and an index outside temperature _{x 0,} and the relative humidity RH ₀ in the outside _air, but as a single map summarized in RH 0 = 20% RH, 60 % RH, each 100% RH, [Delta] P shown in FIG. 3 Using the value of -Q, the amount of sunlight G _T , the outside temperature t _0, and the relative humidity RH _{0 in the} outside air, an approximate curve or an approximate straight line equation of a polynomial is obtained, and watering is performed using the obtained equation. Can be determined.

  DESCRIPTION OF SYMBOLS 10 ... Solar cell panel, 15 ... Rain gutter, 20 ... Water storage tank, 21 ... Pump, 22 ... Watering pipe, 26 ... Temperature sensor, 27 ... Solar radiation sensor, 28 ... Humidity sensor, 30 ... Controller, 35 ... Control map, 36 ... tempered glass layer, 37 ... solar cell layer, 38 ... protective sheet layer, 40 ... rainwater layer

Claims (6)

A sprinkler pipe that is arranged at the upstream end in the tilt direction of the tilted solar cell panel and sprays water from the upstream end in the tilt direction of the solar cell panel to the surface of the solar cell panel;
A collection member for collecting water flowing on the surface of the solar cell panel,
A water storage tank that is disposed near the solar cell panel and stores water recovered by the recovery member,
A pump that sends out the water stored in the water storage tank toward the sprinkler pipe,
Control means for controlling the operation of the pump;
In a watering system for a solar cell panel comprising:
A temperature sensor for detecting an outside air temperature,
A solar radiation sensor for detecting the amount of sunlight irradiation,
Has,
The solar cell panel,
From the sunlight incident surface side, the laminated glass layer, the solar cell layer, and the protective sheet layer are laminated and adhered in this order,
The control means includes:
The necessity of watering based on the difference between the increase in the amount of power generation of the solar cell panel that is increased by performing watering and the amount of power generation in the operation of the pump is summarized by using the outside air temperature and the amount of sunlight irradiation as indices. Control data,
In performing the operation control of the pump based on the outside air temperature detected by the temperature sensor and the irradiation amount of the sun light detected by the solar radiation sensor, using the control data, the outside air temperature and the irradiation of the sun light Determine the necessity of watering based on the amount, perform the operation control of the pump based on the determination result,
The amount of power generation of the solar cell panel when watering is performed, using the temperature of the surface of the tempered glass layer, which is the surface of the solar cell panel when a certain time has elapsed since the start of watering, As the relational expression of the heat balance in the solar cell layer, the amount of solar radiation absorbed in the solar cell layer, heat transfer to the tempered glass layer, heat transfer to the back side with the protective sheet interposed, and power generation in the solar cell layer Energy and the temperature of the upper surface of the tempered glass layer are calculated by substituting the temperature of the upper surface of the tempered glass layer into a formula considering the temperature of the solar cell layer of the solar cell panel.
A watering system for a solar panel. The watering system for a solar cell panel according to claim 1,
The temperature of the surface of the solar cell panel is the temperature of water at the time of watering performed after the elapse of the predetermined time, which is obtained from the relational expression of the heat balance in the water storage tank, and the heat balance of the surface of the solar cell panel and the solar cell. A watering system for a solar cell panel, wherein the water distribution system is calculated based on a function with respect to a surface temperature of the solar cell panel obtained from a relational expression of a heat balance in the solar cell layer of the panel. The watering system for a solar cell panel according to claim 1 or 2,
The recovery member is a downstream end in the tilt direction of the solar cell panel, a rain gutter provided over both ends orthogonal to the tilt direction,
In addition to collecting the water flowing on the surface of the solar cell panel during the sprinkling, the collecting member,
Collecting rainwater flowing on the surface of the solar cell panel during rainfall,
A water spray system for a solar cell panel, wherein the water storage tank has excellent light shielding properties and has a structure capable of insulating heat from outside air against stored rainwater . The watering system for a solar cell panel according to any one of claims 1 to 3,
The water spray system for a solar cell panel, wherein the control data is data summarizing necessity of water spray using humidity in the outside air as an index, in addition to the outside air temperature and the irradiation amount of the sunlight . The water spray system for a solar cell panel according to claim 4 ,
A humidity sensor for detecting humidity in the outside air,
The control means determines whether or not watering is necessary based on the outside air temperature, the irradiation amount of the sunlight and the humidity of the outside air detected by the humidity sensor using the control data, and based on the determination result, A watering system for a solar panel, wherein the operation of the pump is controlled . A sprinkler pipe that is arranged at the upstream end in the tilt direction of the tilted solar cell panel and sprays water from the upstream end in the tilt direction of the solar cell panel to the surface of the solar cell panel;
A collection member for collecting water flowing on the surface of the solar cell panel,
A water storage tank that is disposed near the solar cell panel and stores water recovered by the recovery member,
A pump that sends out the water stored in the water storage tank toward the sprinkler pipe,
Control means for controlling the operation of the pump;
In a watering system for a solar cell panel comprising:
A temperature sensor for detecting an outside air temperature,
A solar radiation sensor for detecting the amount of irradiation of sunlight,
The control means includes:
The necessity of watering based on the difference between the increase in the amount of power generation of the solar cell panel that is increased by performing watering and the amount of power generation in the operation of the pump is summarized by using the outside air temperature and the amount of sunlight irradiation as indices. Control data,
In performing the operation control of the pump based on the outside air temperature detected by the temperature sensor and the irradiation amount of the sun light detected by the solar radiation sensor, using the control data, the outside air temperature and the irradiation of the sun light Determine the necessity of watering based on the amount, perform the operation control of the pump based on the determination result,
The amount of power generated by the solar cell panel when watering is performed is based on the relation between the temperature of the surface of the solar cell panel and the heat balance inside the solar cell panel when a certain time has elapsed since the start of watering. It is calculated using the calculated temperature inside the solar cell panel,
The temperature of the surface of the solar cell panel is the temperature of water at the time of watering performed after the elapse of the predetermined time, which is obtained from the relational expression of the heat balance in the water storage tank, and the heat balance of the surface of the solar cell panel and the solar cell. A water spraying system for a solar cell panel, which is calculated based on a function for a surface temperature of the solar cell panel obtained from a relational expression of a heat balance inside the panel .

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