Ventilation effect of photovoltaic panel roof

Consequently solar PV has indirect effects on roof heat transfer. The effect of rooftop PV systems on the building roof and indoor energy balance as well as their economic impacts on building HVAC costs have not been investigated. Roof calculator models currently do not account for rooftop modifications such as PV arrays.

For integrated solar PV panels, the NHBC advises that traditional roof ventilation strategies, such as ridges, eaves and tile ventilation, are generally sufficient to maintain airflow and manage moisture, without requiring additional counter battens.

However, there are some industry misconceptions around integrated solar PV panels, with some believing that they reduce ventilation, leading to heat build-up and reduced energy output. The NHBC's updated standards directly address this; reinforcing the performance and compliance of integrated solar PV systems.

Therefore, to resolve the conflict between roof vents and rooftop photovoltaic systems in industrial workshops and maximize the installation area for rooftop photovoltaic modules, it is crucial to optimize the structure and location of the roof vents without significantly compromising the natural ventilation capacity of the industrial workshop.

For the natural ventilation workshop, on the premise of ensuring the roof exhaust outlet area, the form and location of the roof vent have no significant impact on the indoor thermal environment. It is feasible to expand the area of roof photovoltaic by adjusting the roof structure and the position and form of the roof vents.

Effects of rooftop PV arrays on building heat transfer improves economics of rooftop installations, but these effects have not been sufficiently quantified. PV acts as insulator. Flat PV best insulator at night, but warmer than tilted PV during day.