Which air curtain is suitable for you always depends on the type of building in which the device is to be installed. The corresponding installation principle is then also decided. Taking stock briefly offers some clarity here. The following building types are defined:
Building type A The room has door surfaces only on one side of the building and no connection to upper floors, which creates an internal thermal condition
As a rule, an installation according to the STE standard principles is sufficient.
Building type B In the building, there are room connections to the top through an open extension over several floors. There are escalators, lifts or permanently open corridors, escape routes and staircases.
For this building type, an installation according to the AWE screening roller principle is recommended.
Building type C Unprotected door surfaces are opposite or around the corner and cause draughts
In addition, the following points must be taken into account when selecting and installing an air curtain system:
All basic conditions must be analysed and evaluated. More powerful units should be deliberately chosen for this situation and mounted according to the installation principle AWE or even better according to TWINtec - counter-current principle.
If you need help with the analysis of the building, our field service will be happy to assist you on request. About the field service Once the type of building has been determined, the installation occurs with the appropriate variant:
The arrangement of the air outlet and air intake creates an air roller, the rotation direction of which affects the room. This corresponds to the standard STE installation principle and applies to both vertical installation and the vast majority of ceiling installation cases. This creates a relatively large zone of increased air movement in the door area. The selectable air exhaust direction on the VIRADO allows the air volume required for screening to be optimised. When two opposing VIRADO air curtains are installed, the screening performance increases by up to 40%.
Formation of a screening roll whose rotation direction acts against the incoming cold air. Due to the arrangement of the air outlet and air intake in the VIRADO type, the implementation of this principle is limited to only a few ceiling installations and mounting in vestibules.
The larger the volume of the room or building, the greater the dynamic pressure on the building. This dynamic pressure causes a negative pressure, which is reduced above the door area, among other things. This means that there is an undesired exchange of air masses at different temperatures.
The exhaust height is one of the most important criteria when selecting air curtain systems. The lower the unit is mounted above the ground, the smaller the amount of air is required to achieve a sufficient screening effect. In that regard, all architectural and technical possibilities should be taken into consideration. Low air volume means: low heating power, low noise level and low purchase and operating costs.
The room height in connection with the room area gives a characteristic value for the leakage of the room and thus for the design of the air curtain. This also applies in connection with thermal buoyancy.
A larger room area (room volume) generally results in an increase in leakage caused by doors, windows and leaks in the building. This increases the air exchange at the door. Due to these conditions and as a result of practical experience, the inclusion of the room size to be screened has proven itself for the design of air curtain systems.
The design basis for the selection of a suitable power rating is the determination of a maximum installation height in relation to the screenable room area.
With TTL control units, air curtains can be effectively adjusted and regulated. In combination with modern electronics, the TTL air curtains are seamlessly adjustable. Remote control is possible via a 0-10-volt signal. This means that TTL air curtains can also be integrated into existing GLT and BMS systems in terms of control technology.
With the UBT plus and TWICS plus control units, TTL air curtains can also be controlled efficiently and as required outside of higher-level systems depending on environmental variables. This means that the air curtain constantly adapts to local conditions, even without intervention by staff.
Console unit for power control of air curtains according to ambient conditions
Universal controller with automatic programs for electrically heated air curtains
Control unit for customer-oriented control or regulating tasks
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