AIR BARRIERS Vs AIR CURTAINS

Enershield Air Barriers create a virtual door by re-circulating ambient air and forcing it at high velocity in a laminar flow across an open doorway to create up to a 90% seal.

The seal separates the atmospheres on either side of the door and stops the transfer of temperature, humidity, dust, odours and insects thus offering many benefits to wide sector of applications. With just a draught of air creating the barrier, vehicles and pedestrians can pass without obstruction.

Enershield Air Barriers works by the use of specially designed large forward curved fans, which circulates the internal facility air (no heating/cooling elements/coils) in a laminar flow across a door opening to create a very efficient energy saving air barrier. Open doorways account for a considerable amount of energy loss in a building. A correctly installed Enershield air barrier can reduce the energy loss through the door and seal up to as much as 90%.

Critical Design Criteria of an Air Barrier

  • UNIFORM AIR FLOW

Enershield manufacture ‘made to measure units’ with consistent fan placement every 2’ allows for uniformity across the Air Barrier, eliminating any low pressure areas.

Air curtains manufacturers have motors in line between the fans with gaps that cause an inconsistent seal.

  • VOLUME & VELOCITY

Specially designed large forward curved fans ensures that suffice air at the correct speed is generated to reach the floor level (furthest point) to obtain a seal. Knowing the velocity of air required at the furthest point to create the seal and given the height of the door, we know what needs to be generated at the nozzle discharge.

The strength of an AIR BARRIER follows the formula: mass times the velocity squared. Therefore an Air Barrier that blows at twice the speed has four times the wind stopping capability at the same air volume.

For example: A cold store door measuring 3M high x 2.5M wide

Enershield propose either the DS or DSH model, dependant on the velocity of the incoming air.

MODELVELOCITYVOLUME

Durashield (DS96)23m/s19,190 m3/hr

Durashield HD (DSH96)28m/s21,907 m3/hr

ThermoscreenTS Range designed for cold storageJS Air Curtain – Kool Range designed for cold storage (no velocity specified)

  • LAMINAR AIR FLOW

A specially designed direct discharge nozzle promotes a non-turbulent air stream. The Smoother the air = the greater resistance to outside air infiltration.

Examples of air curtain designed that deflect the air against a baffle that creates a turbulent air stream that is easily penetrated.

  • SOLID ARTICULATING NOZZLE

Creates the ability to direct the entire air stream outwards to counter for incoming air. The angle of discharge is application specific based on varying regional and facility conditions

Many Air Curtains use either a fixed nozzle system - which is unable to counter for incoming air-flow, as it blows straight down- or utilize independent nozzle strips, which each can be adjusted to a different angle, creating “turbulent” air-flow

Fixed NozzleIndependent Strip Nozzle

  • SOLID CONSTRUCTED FRAME