###### Abstract
During these tests, data have been recorded with thermocouples, heat flux meters, opacimeters, and gas analyzers [10]. [PERSON] [11] investigated two hybrid ventilations: natural ventilation through a roof opening combined with mechanical suction and mechanical jet flow. An experimental model was reproduced as 1/10 of the prototype [11]. Among the few examples of real-scale experimental investigations, we could cite the study of [PERSON] et al. [12], who conducted several real-scale experiments aimed at burning a car on the street or inside a parking lot. Recently, numerical studies tended to dominate the literature. [PERSON] and [PERSON] [13] have analyzed the impact of input parameters in the computer modeling of fires, using them as an example a tunnel. [PERSON] [14] performed a numerical study to see the effect of different ventilation rates inside a tunnel. [PERSON] [15] have also conducted a numerical study to analyze the effect of fire on the structural elements of a building. There are also studies on the influence of the ventilation systems on indoor parameters, such as temperature, oxygen concentration, or visibility during a fire [16]. [PERSON] et al. [17] performed a numerical study on the effect of the ventilation system during a fire in an underground parking lot, and they concluded that an impulse ventilation system can prohibit smoke spreading and maintain an acceptable visibility. [PERSON] and [PERSON] [18] conducted an experimental study on the control of hot air and smoke inside a closed parking lot, and they established that the exact position of the extraction fans is not essential when they are not close to the fire source. However, there are very little experimental studies evolution [19] carried out upon indoor environment during fire evolution; consequently, there is a lack of CFD modelling of indoor spaces under fire conditions. However, several other research were carried out on the effect of room ventilation during fire. [PERSON] et al. [20] conducted a numerical study using FDS to track the distribution of smoke in a 4 \(\times\) 7 \(\times\) 10 (m\({}^{3}\)) burning room in different possible scenarios. The main parameters that were followed were the visibility and speed of the smoke distribution, in relation to the fire source. [PERSON] et al. [21] studied, using FDS, the distribution of smoke in a burning room that had natural ventilation. The influence of natural ventilation on the smoke layer was investigated by measuring the distribution of the indoor temperature in time and space. [PERSON] et al. [22] studied the effect of the geometry of vents air lets, upon the hot air exhaust and cold air compensation, using the CFD method with a k-\(\epsilon\) model for describing the turbulence. [PERSON] [16] performed a numerical study on the impact of the ventilation system on the triggering of sprinklers. [PERSON] et al. [23] found that the ventilation rate has only small influence upon the temperature variation during fire scenarios. Other research also found that the use of mechanical devices for ventilating spaces during a fire has both advantages (e.g., better visibility and low amounts of pollutants) and disadvantages (e.g., high oxygen concentrations maintaining combustion, as well as lower temperatures delaying the start-up of sprinklers) [24]. We note here that there is little research carried out on the way these two installations (ventilation and sprinkler installations) influence each other in fire scenarios. The purpose of this study is to experimentally develop a CFD model that can be used to simulate the evolution of the fire indoors, as well as to analyze the relationship between the operation of the sprinkler system and ventilation system through the air temperature in a specific point close to the sprinkler position. The CFD model will also be used to understand the evolution of the indoor environment field parameters during a survival time of 15 min, based on rules laid down by specific technical standards [25].