Air Curtains. Types and Operating Principle

Air Curtains. Types and Operating Principle

The air curtain – is one of the types of climatic equipment designed to prevent heat loss of a building through the planes of door or door openings in places with high traffic: in industrial shops, public and residential buildings, shopping centers, warehouses, restaurants.

Air thermal curtain creates a powerful air stream of air of the required temperature, greater than or equal to the width of the opening at the installation site. Thus, cold air is cut off, as well as maintaining a comfortable temperature in the room.

Air curtain is used in order to save heat, to prevent large volumes of cold air from entering the heated room, and also to protect the entrance groups of the building from freezing (door closers, automatic gates).

Air curtains are available with horizontal or vertical installation, this is determined depending on local conditions. The height of the vertical water thermal curtains should be at least ¾ part of the height of the protected opening. Horizontal air curtain should completely cover the opening across the entire width. Failure to do so will render the curtain ineffective.

Air curtains

How does an air curtain work

The principle of operation of the air curtain is as follows: a high-speed fan creates a vertical flow of air of high speed, due to which a kind of barrier is created that separates the external and internal air environment, thereby preventing the penetration of cold air into the room.

An axial fan with a central location of the electric motor is located along the entire unit – this provides a powerful and even supply of hot air. The unit takes cold air, it passes through the heat exchanger and is blown through in the form of a hot stream parallel to the plane of the door or gate.

Types of power supply air heat curtain
The source of heat for the air curtain can be hot water or electricity.

Water curtains are usually installed where a large heating power is required, due to the large dimensions of the opening (width up to 4m, height up to 12m) – for example, the entrance gate to the building, parking lot, car wash. This allows you to reduce the cost of energy consumption with equal heat transfer.

Savings can reach more than 30%. Air thermal curtain equipment is connected to the central heating or hot water supply system using flexible hoses or stainless corrugated pipes.

To ensure the circulation of the coolant, a mixing unit is installed, similar to that used for supply ventilation systems.

Electric curtains are usually installed on the entrance groups of the building entrance, where it is technically difficult to supply pipelines with a coolant, there is no place to install a mixing unit, to maintain an aesthetic appearance. The power connection is usually 380V.

Types of air curtains

Air inside the room, conditionally divided as follows, by:

  1. Operating mode – permanent and periodic. First
    preferable if the doors are always open.
  2. Flow direction – horizontal (single and dual stream) and
    vertical (“blow” from top to bottom or vice versa).
  3. To the principle of action – shut-off and mixing.
  4. View – horizontal, universal, vertical air
    curtains.
  5. Intake – air can be taken both inside and
    outside the room.
  6. Supply air temperature – with and without heaters.
  7. Mounting height – up to 2.5 m, up to 3.5, up to 5 m.
  8. Type of installation – there are models with external installation and systems
    flush mounting.
  9. Design – standard and design models.

Unheated air curtains are used in
those cases when you need to separate two zones with different levels
pollution or to keep the temperature chilled
air.

In another way, air curtains are called air curtains. Directed flow of heated air prevents entry inside the room:

  • cold;
  • drafts;
  • insects;
  • unpleasant odors;
  • exhaust;
  • summer heat;
  • dust;
  • smoke;
  • smog.

Two-line models screen the entrance to the room with two streams air masses – warmed up and room temperature air. AT instead of one such units, two fan units, each of which directs “its” flow. Thus formed efficient air barrier.

Two-stream installations consume 2 times more
electricity, but at the same time save 30% more heat by
compared to single-threaded.

There are special chassis units that install mainly in industrial type buildings with high dust level. In such curtains, the fan part and the air supply element is mounted separately.

Horizontal air curtains are installed above the door an aperture (or in a false ceiling). They must absolutely overlap it in width, and it is better to capture the extra 10-15 cm with each side.

Horizontal thermal curtains

Vertical curtains are installed on both sides of the opening in the form of special columns. It is important to consider the distance from the floor to ceiling: the device must cover at least 66% of the height premises.

Vertical thermal curtains

Vertical air curtains are used when
there is no way to establish a horizontal model
type.

The advantage of universal heating plants is that they suitable for both horizontal and vertical method installation – the installation method is determined based on the features layouts.

There are air curtains that are designed to
applications in high humidity (in pools,
water parks, car washes, etc.) – such models have a high degree
protection (IP 54).

What arepower curtains?

Manufacturers offer a wide selection of units that designed to solve various problems. If you classify air curtains by power, then you can select the following groups of electrical appliances:

  1. Home appliances – power from 3 kW to 10 kW.
  2. Office varieties – power from 4 kW to 6 kW.
  3. Industrial analogues – power from 20 kW to 30 kW.

Domestic units operate on 220 V. main advantage such devices – low noise. When installing household curtains there is a restriction – the opening height is not more than 3 m. Office air curtains are designed for installation in spacious the premises. Their main task is to maintain internal microclimate. Industrial units can be mounted above openings above 3 m (above the gate). They are connected to a 380 V network.

What depends the price of air curtains?

Cost depends on:

  • power;
  • performance;
  • maximum air speed;
  • availability of additional functions;
  • design;
  • noise level;
  • connectivity options for devices.

Varieties of air curtains can
equip with sensors
movement. Understaffed in this way the unit will be more
work economically, including when recording movement in the zone
instrument location.

To make the room warm and cozy, you need:

  • take care of installing high-quality double-glazed windows;
  • if possible to carry out work on the internal and external
    insulation;
  • choose the right heating system;
  • eliminate the causes of possible heat loss.

However, such events will be ineffective if warm will leave through the front door. The modern market offers a wide range of models air curtains that effectively solve the above Problems. Installation air curtains helps significantly reduce costs for heating in winter and air conditioning in summer.

Air curtain control

Air curtain control method can be local, using a wired or remote control panel, or remote – for example, if air thermal curtain is included in the dispatch system of a building or industrial facility.

In any case, the operation mode of the curtain is set by the temperature sensor installed in the range of the unit. It can be located on a wall, in a wall or radio remote control. When the temperature changes, relative to the set point, the controller switches the unit into operation.

In rooms equipped with automatic gates, limit switches are used that turn on the air thermal curtain when opening the gates, often this method is combined with control by a temperature sensor.

Choosing a water thermal curtain

Air curtain are used for air insulation of the interior of the room from outside air. The main criteria for selection are:

  • Thermal power.
  • Installation method air heat curtain .
  • Air performance.
  • Way to connect to power supply.
  • Overall dimensions of an aperture.
  • Aesthetic look.

Air curtain installation

Installation of air curtain is a time-consuming process and requires the involvement of qualified specialists – this is necessary for subsequent warranty and after-sales service.

The distance from the surface (with horizontal installation – from the ceiling, with vertical – from the wall) should be at least 0.3 m. Otherwise, air intake by the equipment will be difficult, which will lead to a decrease in performance.

An important point: when installing air curtains, it is necessary to pay attention to the operation of ventilation at the air curtain location. The lack of a positive pressure balance indoors can adversely affect the operation of the curtain.

Therefore, before installing the curtain, it is necessary to balance the ventilation of the building or the local zone of the air curtain installation.

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