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Fhc Hydraulic Calculation Software카테고리 없음 2020. 2. 26. 12:04
IntroductionFHC hydraulic calculation software can be used for the hydraulic analysis of almost any water-based fire protection system including fire sprinklers, water mist (low and high pressure), hydrants, hose reels and much more. In fact if water comes out of a nozzle FHC will be able to calculate the system for you so it is only limited by your imagination. FHC is a world leader in hydraulic analysis software and has hundreds of users in over 50 countries and complies with over 30 international design standards including NFPA, FM Globe and EN 12845With FHC you can build complex hydraulic models simply, with a set of easy to use design tools and you can see the pipe network instantly on the screen. You can calculate any type of pipework network from simple tree systems to multiple looped systems or any other combination. As you create the hydraulic model and connect pipe nodes together FHC will automatically find any tees and elbows you have created and will add the fitting to the pipe and lookup the equivalent length in its extensive pipe and fitting database.In this tutorial will introduce you to some of the basic concepts to help you gain an understanding of the most common commands in easy to learn steps.
If you follow this guide you will soon be creating your own hydraulic models and calculating successfully.How to Start FHCYou should find the FHC icon on the desktop which is the simplest method of starting FHC or by going to the Windows ' Start ' menu and select ' All Programs - FHC ' (Windows 7, 8, 8.1 and 10) in Windows 10 you can just type FHC in to the search bar, once the program has started you will see the FHC screen as bellow.You will find that most of the command commands you require will be available on the Toolbar or as shortcut keys (a full list is given in ). We will indicate a shortcut key such as ‘Add Pipe’ like this Ctrl+A you then press the Control key and the ‘A’ key together.The most frequently used commands are grouped together in logical sections on the Tool bar such as file, view, pipe tools (Add, Edit.), Copy & Calculate.The status bar is divided in to sections and will display information about the project1. P = No of pipes in the system, L = No of loops, H = No of Heads & A = Area the heads cover2. The current selected tool (VIEW, ADD, EDIT, CALC.)3.
The current display view4. OFF/NO is error checking switch off5. The heights and lowest node numbers in the system6. Green tick indicates that the FHC project has been saved.
ESFR systems with additional rack protectionThis fire sprinkler installation was installed into major car manufactures parts facility and is somewhat bespoke in its design. The roof level sprinklers are ESFR 25mm with a K-factor of 360 and a minimum head pressure of 3.5 bars. In addition, the rack storage bellow is protected with 20mm sprinkler with a K-factor of 115 and a minimum head pressure of 1.0 bar. The final water demand requirements for the system was 9849 Lpm @ 9.0 bar and this was with a 98% design efficiency.
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The FHC hydraulic model consisted of 810 pipes, 154 loops and 26 heads and was calculated on an old Pentium VI computer under 0.1 seconds. Fixed Water Spray System to outside wallThis system is a water spray deluge system installed on a outside wall to provide a water curtain. The systems was designed in accordance with FM Global requirements which called for the sprinkler heads to be spaced at 2.4m apart with a standard fire sprinkler with a K-factor of 80. However the minimum head pressure of 1.4 bar was used, this is to insure the sprinkler achieves its full discard pattern in a moderate wind.As the system is designed to FM requirements and as it's a 'DRY' system we have used the 'DRY' switch in the project data fluid field., this will insure that the pipes C-factor is reduced to 100. We also used FHC 'AUTO pipe size' command so FHC will selected the most economic pipe size for the project based on the design parameters which we have set. Storage tank protection with foam pourerThis hydraulic model represents a large storage tank with a fixed cone roof and is protected by three foam chambers.
Fire Hydraulic Calculations
The foam chambers are located above the liquid level of the tank and the deflector is located inside the tank to distribute the foam solution over the surface.The number of foam chamber is determined by the tank diameter for a fixed cone or open top tank and the flow rate can be calculated by multiplying the area by the required density.The tank in this example has a diameter of 30m and therefore a surface area of 707m 2. If we base the design density on 4.1 mm/min this will give us a minimum flow rate of 2899 lpm and will require a minimum of two foam chambers but to give a give faster foam distribution we have used three. Also the volume of foam from each pourer is also reduced which will allow for a smaller riser pipe to each of the foam chambers. For this design we have used 80mm Viking Model FC foam chambers and each chamber will protect 236m 2 area and require a minimum of 699 lpm discharge. By using the manufactures design table we can determine that we will require a minimum pressure of 4.14 bar at the foam chamber inlet.With the above information we can now proceed to start the hydraulic calculation for the systems but instead of using a sprinkle or head as the output devices we can specify in FHC the required flow rate and pressure which require for each foam chamber on our system in the optional items section in the Project Data.
When we calculate the hydraulic model in FHC we find that we will require a source duty of 2122 lpm @ 5.525 bar.You can find out more information about protection to storage tanks in NFPA 11: Standard for low, medium, and high-expansion foam. Two Installations & one water supplyAn example two-installation control valves supplied by one water supply. The first installation is a grid roof sprinkler system designed to give 12.5 mm/min over 260m2, and the seconded installation feeds the in-rack sprinkler system. The FHC program calculated this system in under 1 second.Within FHC we have specified the required density at roof level and the minimum operating pressure of 2.0 bar for the sprinkler heads within the racks. The FHC program will automatically balance the water requirements for the two installations and will allow you to optimised the pipe sizes by making global or selected changes to the pipe sizes. This can help the designer reduce pipe sizes and minimise the water flow requirements. Fire sprinkler system - tree pipe work configurationFire sprinkler systems often use tree pipe work configuration in the system design and although this configuration is not as hydraulically efficient as a loop or grid system it still has its uses.
For complex buildings such as schools, residential care homes and systems which require a dry fire sprinkler installation to be installed, then a tree system can be the way to go. The pipe work in a tree work configurations can be sized in the conventional way by using pre sized pipe tables for the number of sprinkler heads or by fully calculating the hydraulics by hand without much difficulty, but ever for a small systems they are still very time consuming and prone to human error. By using FHC you have all the advantages of full hydraulic calculations in helping you reduce your pipe sizes and or the water demand and the calculations will not have the human error factor and will take a fraction of a seconded to calculate, allowing you the designer more time to optimizes the system and reduce costs.The system display above was created in FHC with the help of the 'Tree Planter' wizard.
This allows you to specify a small number of parameters and FHC will create the sprinklers and pipe work you require. The system has 34 pipes and 18 fire sprinkler head and is designed to EN 12845 ordinary hazard group III but we could have chosen any of the 15 designed standards you can choose from in FHC.
Hydraulic Calculation Software
We draw a calculation the systems in about 10 minutes and the calculation time was 0.013 of a second, now that fast.