Smoke and heat exhaust ventilation systems (SHEVS) are important components of safety and fire prevention concepts and are increasingly being demanded by building approval authorities. SHEVS reduce the risks of injury to persons and damage to property in case of fire. Naturally operating SHEVS are usually designed in accordance with VdS CEA 4020 and DIN 18232-2, mechanically operating SHEVS are designed in accordance with DIN 18232-5.
VdS offers a calculation program for SHEVS in accordance with the above mentioned guidelines. As a result, the VdS installation certificate is printed out. The qualified person will be provided with the VdS SHEVS program and with practical assistance you can also easily make comparisons between the individual guidelines. The media, the program is delivered on, include the guidelines VdS CEA 4020 and an extensive manual.
The user has a total of four windows (tabs) for the calculation. The first window contains general information about the particular project. By pressing a button this data is automatically transferred to the printout of the result in the VdS installation certificate.
It can be created and saved in several versions of each project. Basically, several projects can be processed simultaneously.
After entering the building geometry and the required data needed for the design concerning the fire load and the time that is calculated up to fire detection and fire fighting, the program indicates how many smoke compartments should be designed according to guidelines. Each smoke compartment is then calculated separately with spacious possibilities for copying.
The bottom information field is shown in red in each case if there are any deviations present on the underlying guidelines. To perform a compliant design, one can follow the red marked advice. In case of a desired deviation from the guidelines, basically there is this possibility. As a result of the calculation any deviations are listed under the heading „deviations from the underlying guidelines” in the print out of the VdS installation certificate.
Within the program, a database for managing smoke and heat exhaust equipment and devices is integrated, and also for the program user which inventoried equipment is subsequently available for future projects. The equipment can be ordered differently with a user-friendly sorting option as needed. As a convenience, a mechanism has been integrated, which automatically marks first the devices type having optimum device size, depending on the minimum number of devices and the necessary aerodynamic opening surface area. This type of device can, but not need be selected.
Normally, a SHEVS is measured by the determination of the desired low-smoke layer and calculation of the aerodynamically effective opening surface area and a subsequent selection of the devices. In certain practical cases, however, the reverse procedure might be useful if, for example, for an existing building with an altered risk of fire, a new dimension of low-smoke layer is required. This possibility is also offered by the VdS program: After entering the building geometry one can use the button "measuring the height of the low-smoke layer" and just determine the factor.
As a result of the calculation, the VdS installation certificate for smoke and heat exhaust ventilation systems is printed. This includes all data entered and possible deviations from the guidelines. This requires the installation of Microsoft Word on the computer. Users are now free to add the missing information and print.