With the severity of environmental problems in recent years, solar energy has become a hot spot in global research. In the past two years, the government's attention to solar energy research shows that solar energy will become the best alternative to fossil fuels in our country and even the world. The use of vacuum tube-type solar photovoltaic photothermal (PV/T) integrated modules can maximize the comprehensive utilization efficiency of solar energy. The cost of the evacuated tube-type solar photovoltaic photothermal (PV/T) integrated module is lower than that of the decentralized module, and the floor area is also smaller than that of the decentralized module, but the efficiency is much higher than that of the decentralized module. The device can provide electricity and hot water at the same time, which can not only relieve the pressure on power generation in my country, but also may even achieve the goal of "double zero building"(zero energy consumption, zero pollution) in the construction industry. Driven by energy and environmental protection pressures, buildings can provide enough area for solar photovoltaic thermal systems without the need to occupy additional land; they can save the support structure of photovoltaic systems and save transmission costs. Solar energy and building integration technology is one of the most important areas in future green building energy-saving applications.

 According to the high heat exchange efficiency of glass vacuum tube collectors, solar photovoltaic cells and vacuum tubes are organically combined. A vacuum tube-type solar photovoltaic photothermal (PV/T) integrated module is proposed, which achieves good heat conduction and electrical insulation between the photovoltaic cell and the solar heat sink plate, ensuring high photovoltaic conversion efficiency of the cell while maintaining high heat exchange efficiency and thermal energy utilization.

 The bottom surface of the solar photovoltaic cell is fixed to the outer wall of the glass inner tube of the vacuum tube through encapsulating glue. The photovoltaic cell is arc-shaped, and the photovoltaic cell and the outer surface of the vacuum tube glass inner tube are tightly bonded through an encapsulating adhesive film. The area of the photovoltaic cell is smaller than the effective lighting area of the transparent glass vacuum tube. The side inside the glass vacuum tube with the photovoltaic cell attached is completely exposed to sunlight, effectively ensuring the coverage of the photovoltaic cell. The glass cover tube and the glass inner tube are vacuum sandwiched. The outer surface of the glass inner tube is coated with a selective absorption coating. The heat absorbing medium can flow directly inside the glass inner tube or high-efficiency heat exchange tubes can be inserted, and the heat absorbing medium flows inside the heat exchange tubes. After absorbing solar energy, the solar glass vacuum tube simultaneously converts electrical energy and heat energy. The heat-absorbing medium in the vacuum collector tube takes away the generated heat in time, so that the photovoltaic cells maintain high photoelectric conversion efficiency. The vacuum interlayer in the vacuum collector tube can effectively reduce heat loss. Therefore, compared with the existing flat-plate solar photovoltaic and photothermal integrated devices, this device can further improve the heat energy transfer efficiency and the comprehensive utilization efficiency of solar energy.

technology maturity

 In recent years, solar photovoltaic and solar thermal technologies have developed very well. It adopts solar photovoltaic photothermal (PV/T) integrated modules, which have been used in buildings. Compared with the separation of the photovoltaic system and the heat collection system, the PV/T integrated system is slightly more complex in production process and slightly higher in labor costs. The integrated system integrates solar cells on the heat absorbing surface of the water heater, increasing the unit heat collection area. Energy output, solar building integration technology is still in the demonstration project stage in my country. This time we propose a vacuum tube solar photovoltaic photothermal (PV/T) integrated module. Compared with previous ones, this module has higher efficiency in utilizing solar energy and is technically easy to implement.

technical innovation

1) Organic combination of solar photovoltaic cells and vacuum tubes. The arc-shaped photovoltaic cells are embedded in the vacuum interlayer of a glass vacuum tube and adhered to the inner tube and outer wall of the vacuum tube through an encapsulating adhesive film. It not only effectively ensures the coverage of photovoltaic cells, but also achieves good heat conduction and electrical insulation between the photovoltaic cells and the solar heat absorbing plate.

2) The heat-absorbing medium can flow directly inside the inner tube of the vacuum tube or various high-efficiency heat exchangers (such as finned tubes, heat pipes, etc.) can be inserted as needed to effectively improve the heat exchange efficiency and the vacuum interlayer in the vacuum tube can effectively reduce heat loss and improve the thermal energy transfer efficiency and comprehensive utilization efficiency of solar energy.

3) The photovoltaic cell materials embedded in the vacuum tube can be selected from crystalline silicon cells or various thin film cells according to needs.