What is the Beijing solar heating greenhouse project?

The Beijing Solar Heating Greenhouse Project is a demonstration project including 12 pilot modern greenhouses with coverage of 520 m 2 solar collectors . Through the solar heating system, the average temperature can be increased by 4–5 ℃.

Are China's solar greenhouses a good investment?

A promising prospect is shown by China's modern solar greenhouses at present levels of performances and costs exemplified by the photovoltaic (PV) greenhouses with a practicable payback period of less than 9 years.

How to regulate the daily operation of the PV greenhouse?

Four sun-tracking methods (closed, quasi-perpendicular sun tracking, no-shading, and open) are proposed to regulate the daily operation of the PV greenhouse with determined PV layouts. Dynamic positions of PV modules by different sun-tracking methods are derived as the functions of the solar positions.

How a PV system can be used in a greenhouse?

By placing PV systems on roof top or integrating to greenhouse structure, the large availability of surfaces taken up by greenhouses is able to grow agricultural products below while producing self-consumed energy on the top, which allows the multifunction role of one land .

Are organic photovoltaics a smart greenhouse?

Hence, a smart greenhouse with semi-transparent organic photovoltaics (OPVs) integrated into the power-generating roof is highly desirable for modern agriculture 2, 3. Due to the unique band structure of organic materials, OPVs are able to selectively absorb light with a desired wavelength 4, 5, 6.

Are semi-transparent organic photovoltaics feasible?

Semi-transparent organic photovoltaics (OPVs) are an emerging solar-energy-harvesting technology with promising applications, such as rooftop energy supplies for environmentally friendly greenhouses. However, the poor operational stability of OPVs poses challenges to their feasibility as incessantly serving facilities.