## 4 Conclusions  
It is evident from Figure 2 that the value of heat release flow depends on two basic aspects, namely on the group of productions and operations and on influence of the stable fire-extinguishing equipment. Presence of the stable extinguishing equipment significantly reduces the heat release flow. In terms of the monitored attributes, which are the activation time of the nearest sprinkler head, the maximum ambient temperature at the steel platform ceiling and the maximum temperature of the horizontal platform structure, it can generally be stated that the results of all the compared methods achieve relatively good agreement. This fact demonstrates the good applicability of all the methods used in Figures 3 and 4. When evaluating the activation time of the nearest sprinkler head, the simplified calculation methods achieve the highest values. The CFAST and FDS models were found to have lower head activation times. The simplified computational procedures demonstrate the expected conservative nature of this task. The temperature drop after sprinkler head activation is more progressive in the FDS model than in the CFAST model. This is due to the gradual opening of more sprinkler heads in the FDS model. For the CFAST model, only one sprinkler head was triggered. When determining the maximum ambient temperature at the steel platform ceiling, the results determined by the FDS model are the highest, followed by the simplified calculation results and finally the CFAST model results. The difference in the observed maximum ambient temperatures at the steel platform ceiling location between CFAST and FDS is due to the fact that CFAST assumes an average value for the upper hot combustion products layer, whereas FDS records temperatures at each location in the environment under consideration. The locally recorded maximum temperatures at the steel ceiling location (below the ceiling) are higher in the FDS model for this reason. The fact that the simplified calculations reach the second highest values is consistent with the expected results of the conservative calculations. The surface temperatures of the steel structure reach good consistency in all evaluation methods. The results of the simplified calculation models and the CFAST model are almost identical (they only differ in units of degrees). Higher values are obtained with the FDS model. This is related to the higher maximum ambient temperatures at the steel platform ceiling location, which are due to the FDS model calculation technique. In general, it can be concluded that all methods achieve \"good consistency of results\" and are useful for the determination of the parameters evaluated. It can be recommended that the simplified calculation methods should be used more for preliminary evaluations. The CFAST zonal model also deserves recognition. Although it is a simple computational model, the results of which can be obtained with simple input data, short simulation times, and very simple operation, it, nevertheless, achieves relevant values in Figure 5.  
The FDS model is one of the most sophisticated computational models in terms of the methods compared. It may be surprising that in some situations it achieves less favorable values than the simplified or zonal models, but this is due to the more detailed assessment of some of the accompanying fire phenomena. The FDS model is, clearly, very promising. However, it is also necessary to highlight the fact that the use of the FDS model is rather complicated, especially if some of the extensions that make it easy to use are not used. Moreover, the actual simulation is demanding on the hardware that is used for the calculation, where the actual simulation can take hours or even days. The main benefit of the current models is a close approximation to the real conditions of fire, thanks to abilities to define the boundary conditions as well as thanks to a possibility to formulate the process of burning, process of heat dissipation in space and its transfer to structure of building, the process of extinguishing, etc.