Abstract: In this paper, the influence rules of different factors on the fire spread of photovoltaic modules are given through comparative analysis, and the theoretical analysis of the fire spread of photovoltaic modules is carried out by combining the physical experiment and simulation calculation. Through the analysis of fire spread heat flux of photovoltaic modules, it can be found that the installation of photovoltaic modules on the roof blocks and reflects the flame, expands the range of preheating zone and the maximum temperature, and thus promotes the fire spread of photovoltaic modules. The simulation results are verified through the physical experiment analysis. The influences of waterproof coil, photovoltaic module shielding, wind speed, roof slope and other individual factors are analyzed by FDS numerical simulation calculation. The waterproof coil provided the fuel in the preheating zone, the photovoltaic module promoted the heat deflection of the flame, and the wind speed and slope expanded the scope of the preheating zone and increased the non?uniformity of heat flow, thus promoting the spread of flame. The solid experiment results are basically consistent with the simulated calculation results, and the error is caused by uneven combustion. More different types of solid experiments can be carried out to verify and correct the simulated calculation results.

Key words: roof photovoltaic modules, spread of fire, heat flux, preheating zone, FDS