Product Specifications

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Product Description

JDSOLAR applies distributed photovoltaic power stations to energy-saving renovation of public buildings, realizes energy structure adjustment, improves building space utilization, and reduces energy consumption per unit area by 20% -30%. In addition, JDSOLAR has actively tried new financing models such as photovoltaic asset securitization to ensure the efficient implementation of projects with lower financing costs and accelerate the development of a low-carbon society and the development of smart cities.

Application scenario

Government agencies, hospitals, schools, public facilities, museums, bus stations, train stations, airports and other transportation hubs

The building roof area of public units is generally not large, and it is usually only suitable for installing rooftop photovoltaic power plants with a capacity of 100-500KW. Although the capacity is small, there are a large number of public units in China, and most have idle roofs. In addition, these public units have a certain credibility in the public's mind, and if they install photovoltaics, they will have a very good effect on the popularity and promotion of photovoltaics.

Public building rooftop photovoltaic power stations are most suitable for photovoltaic building integration, which is a technology that integrates solar power (photovoltaic) products into buildings. Photovoltaic building-integration is different from the form of photovoltaic system attached to the building. The integration of photovoltaic buildings can be divided into two categories: one is the combination of photovoltaic square arrays and buildings. The other is the integration of photovoltaic square arrays and buildings. Such as photovoltaic tile roof, photovoltaic curtain wall and photovoltaic lighting roof. In these two ways, the combination of photovoltaic square array and building is a commonly used form, especially the combination with building roof.

The combination of photovoltaic square arrays and buildings does not take up additional ground space, and is the best installation method for photovoltaic power generation systems widely used in cities, so it has attracted much attention. The integration of photovoltaic square array and building is an advanced form of BIPV, which has higher requirements for photovoltaic modules. Photovoltaic modules must not only meet the functional requirements of photovoltaic power generation, but also take into account the basic functional requirements of the building.

According to the different ways of integrating photovoltaic arrays and buildings, the integration of solar photovoltaic buildings can be divided into two categories: the combination of buildings and photovoltaic devices and the combination of buildings and photovoltaic systems.

Integration with architecture

The further integration of building and photovoltaic is the integration of photovoltaic devices and building materials. Coatings, decorative tiles, or curtain wall glass are commonly used on the outer surface of buildings to protect and decorate buildings. If photovoltaic devices are used to replace some building materials, that is, photovoltaic modules are used to make roofs, facades and windows of buildings, so that they can be used as both building materials and power generation. For a building with a frame structure, the entire envelope structure can be made into a photovoltaic array, and appropriate photovoltaic modules can be selected to absorb both direct sunlight and reflected sunlight. At present, large-scale color photovoltaic modules have been developed to achieve the above purposes and make the building appearance more attractive.

And photovoltaic system

The photovoltaic system integrated with the building can be used as an independent power supply or power supply in a grid-connected manner. When the system participates in the grid connection, it does not need a battery. But the need for grid-connected devices, and grid-connected power generation is a new trend in photovoltaic applications today. The photovoltaic modules are installed on the roof or external wall of the building, and the lead-out ends are connected to the public power grid through the controller, which needs to supply power to the photovoltaic array and the power grid in parallel to users, which forms a grid-connected photovoltaic system.

According to the combination of photovoltaic square array and building, solar photovoltaic building integration can be divided into two categories:

The first type is the combination of photovoltaic square arrays and buildings. In this way, the photovoltaic square array is attached to the building, and the building serves as a support for the photovoltaic square array.

The second category is the integration of photovoltaic square arrays and buildings. In this way, photovoltaic modules appear in the form of a building material, and the photovoltaic array becomes an integral part of the building.

The combination of photovoltaic square array and building (the first type) is a commonly used form. In the 2008 Olympic Games, China 's National Swimming Center, National Stadium and other Olympic venues, solar photovoltaic grid-connected power generation systems combining photovoltaic arrays and buildings are used. These systems can generate 700,000 kWh of electricity annually, which is equivalent to saving 170 tons of standard coal, reducing 570 tons of carbon dioxide emissions.

Architectural features of JDSOLAR public building rooftop photovoltaic power station

1. Able to meet the requirements of architectural aesthetics;

2. Able to meet the lighting requirements of the building;

3. Able to meet the safety performance requirements of the building;

4. Can meet the requirements of convenient installation;

5. Can have the advantage of long life;

6. With green environmental protection effect;

7. No need to occupy precious land resources;

8. Can effectively reduce building energy consumption and achieve building energy saving;

9. Reduce the temperature rise of the wall and roof.

JDSOLAR public building roof photovoltaic power station building form

It can be said that photovoltaic building integration is suitable for most buildings, such as flat roof, inclined roof, curtain wall, ceiling, etc. can be installed.

Flat roof, from the perspective of power generation, the flat roof economy is the best: 1. It can be installed at the best angle to get the maximum power generation; 2. Standard photovoltaic modules can be used to have the best performance; 3. The function of the building No conflict. 4. Photovoltaic power generation has the lowest cost and is the best choice from the perspective of power generation economics.

Inclined roof, south-inclined roof has better economy: 1. It can be installed at the best angle or close to the best angle, so it can get the maximum or large power generation; 2. Standard photovoltaic modules can be used, with good performance and low cost ; 3, does not conflict with the function of the building. 4. The lowest or lower cost of photovoltaic power generation is one of the preferred installation schemes for photovoltaic systems. The other directions (south-south) are next.

Photovoltaic curtain wall, photovoltaic curtain wall must meet BIPV requirements: in addition to the power generation function, all functional requirements of the curtain wall must be met: including external maintenance, transparency, mechanics, aesthetics, safety, etc., high component costs and low photovoltaic performance; must be designed simultaneously with the building At the same time of construction and installation, the progress of the photovoltaic system project is constrained by the overall progress of the building; the photovoltaic array deviates from the optimal installation angle and the output power is low; the power generation cost is high; it promotes the social value of the building and brings the effect of green concept.

Photovoltaic canopies. Photovoltaic canopies require transparent components and low module efficiency. In addition to power generation and transparency, canopy components must meet certain architectural requirements such as mechanics, aesthetics, and structural connection. The cost of the components is high; the cost of power generation is high; and the social value of the building is enhanced. , Bring the effect of green concept.

Architectural design of JDSOLAR public building rooftop photovoltaic power station

Photovoltaic module performance

As a common photovoltaic module, as long as it passes the test of IEC61215, it can meet the requirements of resistance to wind pressure of 130km / h (2,400Pa) and impact of 25m diameter hail and 23m / s. Photovoltaic modules used as curtain wall panels and daylighting top panels not only need to meet the performance requirements of photovoltaic modules, but also meet the requirements of the three-sex test of curtain walls and the safety performance requirements of buildings. Therefore, higher mechanical properties and different structures are required. the way. For example, ordinary photovoltaic modules with a size of 1200mm × 530mm can generally use 3.2mm thick tempered ultra-white glass and aluminum alloy frame to meet the requirements. However, components of the same size are used in BIPV buildings. At different locations, different floor heights, and different installation methods, the requirements for its glass mechanical properties may be completely different. The modules used in the outer double-layer curtain wall of the CSG Building are two 6mm thick tempered ultra-white glass photovoltaic modules. This is the result of strict mechanical calculations.

Aesthetic requirements

BIPV building is a building first, it is the artwork of the architect, which is equivalent to the music of a musician, a famous painting of a painter, and for the building, light is his soul, so the building has high requirements for light and shadow. However, most of the glass used in ordinary photovoltaic modules is cloth-lined ultra-white tempered glass, which has a role of frosted glass to block vision. If the BIPV module is installed in the building's sightseeing area, this position needs to be transparent to light. At this time, the double-sided glass module is made of glossy ultra-white tempered glass to meet the functions of the building. At the same time, in order to save costs, the glass on the back of the battery board can be ordinary glossy tempered glass.

The key to the success of a building is the appearance of the building. Sometimes minor inconsistencies are intolerable. However, the junction box of ordinary photovoltaic modules is generally glued on the back of the panel. The junction box is large, which easily destroys the overall sense of coordination of the building. It is usually not accepted by architects. Therefore, BIPV buildings require the junction box to be omitted or hidden. At this time, the bypass diode does not have the protection of the junction box. To consider other methods to protect it, the bypass diode and the connection line need to be hidden in the curtain wall structure. For example, the bypass diode is placed in the framework of the curtain wall to prevent direct sunlight and rain.

The connection lines of ordinary photovoltaic modules are generally exposed below the modules. The connection lines of photovoltaic modules in BIPV buildings are required to be completely hidden in the curtain wall structure.

Structural performance coordination

In the design of BIPV buildings, it is necessary to consider whether the voltage and current of the panel itself are convenient for the selection of photovoltaic system equipment, but the facade of the building may be composed of geometric figures of different sizes and forms, which will cause voltages between components. The current is different. At this time, you can consider partitioning the building facade and adjusting the grid to make the BIPV module close to the electrical performance of the standard module. You can also use different sizes of cells to meet the grid requirements to maximize the building. Facade effect. In addition, it is also possible to disconnect a few of the battery cells on the corners into the circuit to meet the electrical requirements.

Use of solar energy

Solar energy creates favorable conditions for protecting the environment, so many architects cleverly use solar energy to build solar buildings.

1. Solar wall: The solar wall was invented by American construction experts. It is a thin black perforated aluminum plate installed on the outside of the wall of the building, which can absorb 80% of the solar energy shining on the wall. After the air sucked into the aluminum plate is preheated, it is pumped into the building by a pump in the wall, thereby saving the energy consumption of the central air conditioner.

2. Solar windows: German scientists have invented two types of glass windows that use light and heat regulation. One is a solar temperature control system, which collects the heating of the window glass surface of the building during the day, and then transfers this solar energy to the wall and floor space for storage, and then releases it at night; the other is to automatically adjust the amount of sunlight entering the room. Like color-changing sunglasses, depending on the temperature set in the room, the window glass becomes either transparent or opaque.

3. Solar house: German architect Cedo Tehors built a solar house that can turn and track the sun on the base. The house is mounted on a disc base, and a set of gears is driven by a small solar motor to make the house base rotate on the circular track with the sun at a speed of 3 cm per minute. The system that tracks the sun consumes only 1% of the house 's solar power, and the house 's solar power is equivalent to twice the amount of solar houses that typically cannot rotate.

Related requirements

To use photovoltaic devices as building materials, it must have several conditions required by building materials: ruggedness, heat insulation, water and moisture resistance, appropriate strength and stiffness. If it is used for windows, skylights, etc., it must be able to transmit light, that is, it can generate electricity and light. In addition, factors such as safety performance, appearance and ease of construction must be considered. The photovoltaic building integration has the following requirements for photovoltaic photovoltaic systems and photovoltaic modules:

Battery requirements

For grid-connected photovoltaic systems, because they are not limited by battery capacity and are backed by the public grid, when determining the number of photovoltaic lineups, they do not have to undergo strict optimization design like independent photovoltaic systems, as long as they are based on load requirements and investment conditions It can be decided after proper calculation.

Requirements for components

Unlike ordinary flat-panel photovoltaic modules, (BIPV) modules, since they have both power generation and building material functions, must meet the requirements for building material performance, such as: heat insulation, insulation, wind resistance, rain resistance, light transmission, beautiful appearance, but also It has sufficient strength and rigidity, is not easy to break, and is convenient for construction, installation and transportation. In order to meet the needs of construction engineering, JDSOLAR has developed a variety of color solar cell modules for architects to choose, so that the color of the building and the surrounding environment are more harmonious. According to the needs of construction projects, a variety of solar cell modules have been produced that meet the performance requirements of roof tiles, exterior walls, windows, etc. Its shape is not only standard rectangles, but also triangles, diamonds, trapezoids, and even irregular shapes. It can also be made to be frameless or transparent around the module according to requirements. The junction box can be installed on the side instead of the back.

Battery requirements

In an independent photovoltaic system, the photovoltaic square array should be installed as obliquely as possible toward the equator, and the inclination angle with the horizontal plane must be calculated strictly to achieve the maximum and balance of the output of the photovoltaic square array [6]. In grid-connected photovoltaic systems, it is sufficient to consider the maximum output of the photovoltaic square array. However, in practical applications, the square matrix may have various orientations and inclination angles may vary from 0 to 900 because of obeying the needs of the building's shape. This requires the photovoltaic and architectural designers to negotiate and take into account both parties 'needs. Need to solve it properly.

Requirements for inverter

The solar cell square array emits low-voltage direct current. To be connected to the power grid, it must be converted into AC of 220 volts, 380 volts or higher, and for power quality parameters such as voltage, ripple, frequency, harmonics, and power factors, etc. Have strict requirements. In order to ensure the safety of the power grid, equipment, and life, it must also be equipped with grid-connected detection and protection devices. And grounding, short circuit protection, disconnect switch, power direction protection have clear regulations. So inverter and controller are the key equipment of grid-connected photovoltaic system.

Metering requirements

In the grid-connected photovoltaic system, the electricity generated by the photovoltaic square array is mainly used by the user load. The excess part is input to the power grid. The electricity consumed by the user load is also supplied by the photovoltaic square array and the public grid. In principle, a meter can be used for metering. The meter is turned forward when the power grid supplies power, and the meter is reversed when the photovoltaic square array feeds the grid.

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