The energy reflected from the sunlight surface (two single-layer glass surfaces, four empty glass surfaces) represents hundreds of incident energy. (4) Solar radiation
The sun radiates energy. space in the form of electromagnetic waves, which transfer energy The formula is collectively called solar radiation. Energy from solar radiation is the primary source of surface air energy. Solar radiation is evenly distributed across the globe, causing changes in everyone's climate. air. The physical quantity which expresses the intensity of solar radiation is called solar radiation intensity. The unit is Joule/cm2·, that is to say between the units The energy of solar radiation projected vertically per unit area.
Radiation, or luminosity, describes the physical quantity characteristic of a surface radiation source. It represents the radiation flux in anunit solid angle of the projection surface of a radiation source in a certain direction, represented by the symbol L. L directionality, unit watt/meter 2 steradian (Wm-2sr-1). 1.3 Shading coefficient (shading coefficient)
The shading coefficient is equivalent to the definition of 3mm colored transparent glass, 3mm The total solar transmittance. of colored transparent glass is 1 (the total solar transmittance of 3mm colored transparent glass is 0.87). Glass has its shape value, that is, the total solar transmittance of the glass is divided by 0.87.
Shading. coefficient Sc: Under the same conditions, the transmission coefficient is the ratio between the radiant solar energy of the glass and the radiant solar energy of the 3 mm transparent white glass. The standard value of radiant solar energy of 3mm transparent white glass is 630W/m2. Formula: Shading coefficient Sc. = radiant solar energy of acertain glass ÷ 630w/m2
1.4 Phase heat gain
It is used to reflect the overall energy saving index of glass. The specified condition is that the. The indoor and outdoor temperature difference is 15°C. The transparent unit area (3 mm transparent, 1 m2) of the glass sphere is at a latitude of 30°C at sea level and heat is transferred into the room through the glass. and the outside temperature difference is 15 OC. The heat transfer through the glass plus the latitude of the sphere is 30 W. The heat from solar radiation is 630 W/m2 and the product of the protection coefficient.
Acrylic or solar glass< . /h3>
< p>Power generation principle:
The reason why these "power generation glasses" can produce electricity is that there are these coatings on the glass. The coating is actually made of a large number of thin film solar cellsamorphous silicon cells connected in series. The relationship between these coatings and sunlight is actually the same as the relationship between rechargeable batteries and the alternating current used for charging. The coating is like the rechargeable batteries we use. Sunlight is like alternating current that charges a battery. When the sun shines on the “power-generating glass,” the glass begins to produce electricity. This is the same as when a rechargeable battery starts charging after plugging in the power source.
The sunlight absorbed by the thin-film amorphous silicon cells of these “power generation glasses” is mainly visible light. The greater the intensity of sunlight, the more vertical the angle at which the light hits the "power generation glass", the more sunlight the "power generation glass" absorbsand the greater the energy production.
Detailed information:
The so-called "electric glass hair" is a layman's term. The correct name should be "cadmium telluride thin film solar cell", or CdTe battery for short. It is a thin-film solar cell based on the heterojunction of p-type CdTe and n-type CdS. Glass is just a light-transmitting substrate material and is not a key technical material. This solar cell module is made of 7 layers: 1. Glass substrate: mainly supports the battery and prevents pollution and incident sunlight. must have light transmittance above 91% and its other function is to protect the main body of power generation (like battery cells). EVA is used to bond and fix tempered glass, cellsbattery and backplanes. p>
2. TCO conductive oxide layer, that is, TCO transparent conductive film, mainly plays the role of light transmission and conductivity
3. The p-type CdTe forms a p-n junction.
4. CdTe absorption layer: It is the main light-absorbing layer of the battery, and the p-n junction formed with the n-type CdS window layer is the core. part of the entire battery.
5. Back contact layer and back electrode: In order to reduce the contact barrier between CdTe and the metal electrode, remove the current and form an ohmic contact between the metal electrode and the metal electrode. CdTe, sealing, insulation and waterproofing (TPT is generally used, TPE and other materials should be resistant to aging)
6. Station. If the component is shorted, the junction box will automatically disconnect the battery stringshort-circuited to prevent the entire power generation system from burning out. When connecting the system, the most critical thing in the wiring box is the selection of. diodes. Depending on the type of cells in the module, the corresponding diodes are also different.
7. Aluminum alloy protective laminates: provide a certain degree of waterproofing and a supporting function. silicone gasket, which is used to seal the junction between the component and the aluminum alloy frame, and the component and the junction box.
This type of “power generation glass” with cadmium telluride film refers. covering ordinary glass with a layer of cadmium telluride optoelectronic material, transforming ordinary glass from an insulator to a conductor, and then into a building material capable of generating electricity, obtaining an organic combination of glass and materials even whenweak. electricity by photoelectric conversion under light conditions. It is a green, recyclable and energy-generating multifunctional building material that can replace bricks, curtain walls and other building materials. >< strong>
Reference materials:
Baidu Encyclopedia - Cadmium telluride thin film solar cellsWhat is solar glass
Solar energy cannot use acrylic glass to make solar panels. This is because acrylic is actually made of the same material as plastic, but the flash point of acrylic is. different from that of plastic. The flash point of acrylic is higher, but acrylic glass cannot be used to make solar panels because it does not meet safety standards.
When choosing solar panels, they mustbeing. combined.When choosing solar materials based on comprehensive needs, safety is the most important priority. Acrylic materials are generally widely used, but they cannot be used to make solar panels. Instead, other materials should be used.
Glass has many uses, and different uses of glass have different requirements. Solar glass specifically refers to the glass used in photovoltaic solar modules, which requires good light transmission and minimal reflectivity. What affects light transmission is the composition of the glass. If the glass contains more iron, its light transmission will be poorer. Therefore, solar glass generally has a lower iron content. an anti-reflective coating is usually applied.