Ventilation
Ventilation refers to the targeted air exchange between the photovoltaic system and the underlying roof surface. This air gap is crucial for the optimal performance and longevity of a photovoltaic installation.
Functionality and Importance:
- Cooling of the Modules: Ventilation removes the heat absorbed by the solar modules. High temperatures reduce the efficiency of the modules, as the conversion of sunlight into electrical energy is more efficient at lower temperatures.
- Avoidance of Heat Accumulation: Without sufficient back ventilation, heat accumulation can occur under the modules. This can lead to overheating of the modules and shorten their lifespan.
- Increase in Efficiency: Good back ventilation helps increase the efficiency of the entire photovoltaic installation, as the modules operate continuously at an optimal operating temperature.
Implementation and Factors:
- Minimum Distance: To ensure sufficient back ventilation, a certain minimum distance between the modules and the roof should be maintained. This distance may vary depending on the roof slope and regional climatic conditions.
- Mounting Frame: The mounting frame plays a crucial role in achieving effective back ventilation. It must be designed to ensure adequate air circulation.
- Roof Condition: The condition of the roof also influences back ventilation. Careful planning and execution are particularly important for flat roofs to avoid heat accumulation.
Advantages of Back Ventilation:
- Higher energy yield
- Longer lifespan of the modules
- Lower risk of damage from overheating
- Optimal utilization of the photovoltaic system
Conclusion:
Ventilation is an important factor for the success of a photovoltaic installation. Through careful planning and execution, the performance of the system can be maximized and its lifespan extended.
Keywords: photovoltaics, solar modules, efficiency, roof slope, energy yield