Catalogue - Brochure - DLK Ventilatoren - (Version JPG)

impuise Fans

With the séries VM, DLK has developed a modular system (fan series VM with cylindrical silencers on inlet and outlet plus accessories) for the ventilation of car parks by means of impulse or jet fans. The units are ceiling mounted and facilitate purging of the contaminated air, enabling the CO-concentration to be extracted via a central fan system .

The im pulse fan range is manufactured in diameters of 315mm and 400mm and attains a thrust perform ance of 20 - 60 N.

Description:

Impulse fans for the application of ventilation and purging parking garages in rectangular form, with integrated silencers on inlet and outlet facilitating, easy mounting directly to the garage ceiling. Silencers are manufactured from pre-galvanised mild steel and are fitted with inlet cones and wire guards both ends.

Construction:

Casing manufactured from mild steel with rolled flanges on both ends. Motor mountings are welded or riveted. Casings can be hot dip galvanised after manufacture or have a powder coated paint finish.

Impeller:

The impeller is manufactured from die cast aluminium alloy. The blades are of a true aerofoil cross section and are adjustable pitch at rest. The impeller is directly mounted on the motor shaft. Impellers are statically and dynamically balanced according to DIN ISO 1940, class G 6,4 < 4,0 mm/s.

M otor:

Motors are totally enclosed, foot mounted and manufactured according to IEC smoke exhaust. Insulation class H, protection class IP55. Motors are selected for the rated duty at 20°C. Motors are connected to an external terminal box or isolation switch. Cabling is sheathed and protected to suit.

VM series (VSTI model) Impulse fan with inlet and outlet silencers, direct drive

Sizes:

VM 315 - VM 400 (0 mm) Application:

Extraction of smoke fumes up to 300°C/120 min. and for supply and exhaust air up to max. 80°C continuous ambient temp. (standard version up to max. 50°C)

Technical data:

V = 1,000 up to 12,000 m³/h Apt = 100 up to 550 Pa P = 0,25 up to 2,2 kW

Characteristic curve

600



				vm 400
		vm 315

400

Q-

200

Tr. a-. a

S o

100

The Principle

In the last few years, impulse fan technology has rapidly won acceptance in garage ventilation in Germany and is now increasingly finding entry into the different garage regulations. In European countries, such as Great Britain and the Netherlands, it has already been accepted as the new standard for planning.

In comparison to customary ventilation and smoke prevention systems which are based on transverse ventilation, air-duct and sprinkler systems, this system is based on transferring the concepts of jet fans, which are known from tunnel ventilation. These sound suppressed, free aspirating and blowing axial fans inject an airflow with high impulses into the tunnel cross-section. This impulse induces a current of air and accelerates the air-masses in the tunnel in addition to the natural air current.

Important parameters for performance are the speed of the current created through the impulse fans and therefore thrust reach and the static thrust.

The Advantages

In closed garages, constant air circulation can be generated through using an adequate number of impulse fans on two levels (high air speed in the ceiling area, lower air speed in the pedestrian area). This keeps the carbon monoxide pollution to a minimum.

By placing the impulse fans carefully, it is possible to eliminate those dead areas which can collect exhaust pollutants due to architectonic circumstances and where sufficient air exchange is not guaranteed by conventional duct-connected ventilation. It is possible to completely avoid the expensive installation of an air-duct system.

The necessary overall output of the fans can be reduced because there are no duct resistances to be overcome. If required, DLK impulse fans can be designed in such a way that operation is guaranteed for at least two hours in an ambient temperature of 300°C.

This means that they also fulfil the function of mechanical smoke extraction of the garage at the same time.

Through the use of reversible impellers, the impulse fans can be reversed in case of fire so that the ensuing fumes are directed to the closest extraction portal.

The spreading of fumes to unaffected parts of the garage can thus be prevented and escape routes can be kept smoke-free. The virtual fire passages arising from this means that it is not necessary to actually physically separate the garage surfaces through fire walls (in closed garages, there should be a fire passage every 2,500 m³).

The user-friendliness of the garage can clearly be increased by more open-plan and lighter design as well as simplified driving processes, which can increase the user's perception of security.

The improved exploitation of the parking area through an increased number of parking spaces, improves the long term economic results for the operator.

Ventilating garages by means of impulse fans guarantees an adequate level of security in terms of the garage regulations and produces better ventilation results than the conventional duct-connected ventilation.

The requirements of the guidelines VDI 2053 and DIN 18332, part 6 (mechanical smoke and heat extraction systems) are adhered to. The additional costs of the impulse fans are more than balanced out since the need for a duct network with the resulting heat from the fire can be omitted.

200

400

600

800

1000

1200

1400

Tested according to EN 12101-3

Allgemeine bauaufsichtliche Zulassung/ Building Supervisory Authority DIN 315^00, Nr.: Z 78.1-36

Accuracy class according to DIN 24166

Tolerances according

to DIN ISO 2768

Power measuring according

to DIN 24163

When installing: local fire regulations and requirements must be t aken into consideration

Brochure - DLK Ventilatoren - #7

Ventilation unit, Centrifugal fan, Roof fan, Blower, Fan