There are so many air conditioning vents, how to choose?


There are so many air conditioning vents, how to choose?

forms of air flow distribution

1. The Type of Air Conditioning Vents

1.1 Air Piping Outlet

Air piping outlet is an airflow distribution device that integrates the functions of air supply duct, plenum chamber, insulation material, tuyere and damper. It is suitable for light steel structure buildings, old building renovation, restaurants, swimming pools, gymnasiums, exhibition halls and other tall spaces and renovation projects. There are 7 air supply modes: FabFlow, NozzFlow, PerfoFlow, MeshFlow, SonicFlow, and OriFlow.

1.1.1 Air Piping Outlet FabFlow Outflow

air piping outlet

Air seeps out from the surface of the permeable fabric. The air is thermally driven, which avoids the sensation of wind in the supply area, resulting in a high level of comfort.

1.1.2 Air Piping Outlet NozzFlow Outflow

Air Piping Outlet NozzFlow Outflow

Air is ejected through one or more rows of nozzles in the pipe, creating a very stable directional airflow. The spout evenly distributes air along the entire length of the tube, ensuring a high level of comfort.

1.1.3 Air Piping Outlet PerfoFlow Outflow

Air Piping Outlet PerfoFlow Outflow

Air flows out of numerous small holes scattered around the circumferential surface of the pipe, resulting in a low outlet velocity.

1.1.4 Air Piping Outlet MeshFlow Outflow

The air is sent out along the mesh strip along the length of the pipe. The increased velocity of the air through the mesh strip creates a pulsating vortex phenomenon that both throws and mixes the air with the indoor air.

1.1.5 Air Piping Outlet SonicFlow Outflow

Air Piping Outlet SonicFlow Outflow

The air is distributed through small holes in the fabric; they are arranged in rows along the length, and the air flow is controlled by static pressure, which determines the speed at which the air is blown out of the tube.

1.1.6 Air Piping Outlet OriFlow Outflow

Air Piping Outlet OriFlow Outflow

 The air is blown out through the large holes in the fabric, which is suitable for remote air supply with large air volumes.

1.1.7 Air Piping Outlet JetFlow Outflow

Air Piping Outlet JetFlow Outflow

Depending on the range requirements, the size of the nozzle can be determined, providing a long-range air supply of up to 71 meters for tall spaces.

1.2 Jet Nozzle Diffuser

This object is used for free-flowing, centralized air supply in tall spaces (commercial atrium, airport). The jet nozzle diffuser is selected based on the length of the work area and the drop.

Jet Nozzle Diffuser

1.3 Deflection Grille

 Single-layer: adjust the angle of the blinds, the air conditioner generally often

 Double-layer: foliate blades to adjust the airflow, two layers of blinds to adjust the angleDouble Deflection Grille

 Application: Air supply requirements with guiding function. Commonly used in civil air conditioning systems.

Deflection Grille

1.3.1 Movable Double Deflection Grille

It can be used with fan coil units or in centralized air conditioning systems. The blades of the tuyere can be adjusted arbitrarily in the range of 0-90 degrees, so that different air supply distances and diffusion angles can be obtained with the split multi-leaf control valve, and the air volume can be adjusted.

Movable Double Deflection Grille

The blades of the tuyere can be adjusted arbitrarily in the range of 0-90 degrees, so as to obtain different air supply distances and diffusion angles.

The blades of the tuyere

1.3.2 Fixed Louver Sidewall Grille Tuyere

Fixed Louver Sidewall Grille Tuyere

1.3.3 Openable Louver Sidewall Grille Tuyere

The whole tuyere is in the form of a valve, and the valve and the frame can be opened and closed freely, which is conducive to installation and matching with the filter, and is often used in guest rooms and return air systems with filtration.

Openable Louver Sidewall Grille Tuyere

1.3.4 Fixed Blade Oblique Louvered Air Supply Outlet

The blades are fixed, and the angle of inclination is 24 degrees. It can be used as a supply or return air outlet. There are one-way and two-way diagonal air supply (subway).

 Fixed Blade Oblique Louvered Air Supply Outlet
 Fixed Blade Oblique Louvered Air Supply Outlet

1.3.5 Gravity Shutter

It is used for automatic exhaust in air-conditioned rooms with positive pressure. The louvers naturally hang down by their own weight, isolating the air exchange between indoors and outdoors. When the indoor air pressure is higher than the outside, the air flow blows the louver open, exhausts, and vice versa.

Gravity Shutter

1.3.6 Light Proof Louver Tuyere

It is used for the ventilation of dark rooms.

Light Proof Louver Tuyere

1.4 Ceiling Diffuser

 Application: ceiling air supply

 Disk type: flat delivery

 supply and return type: upper supply and return

 Straight blade type: upper supply or flat delivery

 Streamlined type: Downward delivery

1.4.1 Square Ceiling Diffuser

The airflow form is attached (flat delivery) type.

1.4.2 Circular Diffuser

It is generally used for cold and warm air supply and can blow out airflow sticking type. The structure is mostly multi-layer tapered type. The indoor induced airflow is large, and the outgoing airflow velocity and temperature decay are fast.

1.4.3 Grille

This one can do vertical air, side and upward supply, and is a general air conditioning project.


1.4.4 Slot Type Air Opening

 Linear Slot Air Opening

Application: Inner ceiling, perimeter ceiling, window sill, floor, upper side sending

 Slot Type Air Opening

1.4.5 Swirl Diffuser

The air outlet is a rotating jet with a large induction ratio and large velocity attenuation, which can be used for air supply with large air volume and large temperature difference, and can be installed on the ceiling or ceiling. Suitable for downward air supply.
Classification: Top Cold  Air Dispersion Type and Top Hot Air Attachment Type

Swirl Diffuser

1.4.6 Air Supply Orifice Plate

The air supply speed is more than 3m/s, the temperature difference of the air supply is greater than or equal to 3°C, and parallel flow occurs, which is suitable for ultra-quiet air conditioning. Low wind speed, good attenuation, high comfort. The air supply is uniform and the speed decay is fast.

Air Supply Orifice Plate

2.1 The Choice of Materials for Air Conditioning Vents

2.1.1 Aluminum

Aluminum alloy is currently the most popular air outlet material on the market, with easy to shape, cost-effective, not easy to change color, but the shortcomings are also very obvious, aluminum alloy spray paint is easy to be scratched off the color, and by the temperature change response is obvious, but the summer use, the air temperature is set to a lower temperature, the air volume is too small, the air duct heat preservation is not done, the aluminum alloy air outlet table is easy to produce dripping dew, not clear to people who Thought the air conditioning leakage, insiders can increase the air supply and close the windows and doors to block the source of moisture, thus reducing the air outlet dew phenomenon.


2.1.2 ABS

ABS material air outlet is also considered to be a more widely used in the market, with anti-corrosion, waterproof, sound insulation, heat preservation, insulation and other characteristics, according to the demand can be customized to different sizes and styles of styles, the later use of the phenomenon is not prone to condensation and deformation, but the price of the production of a slightly higher price, and there is a risk of discoloration. The current ABS air outlet and motor combination can do the central air conditioning outlet automatically adjust and close the function.


2.1.3 Wooden Air Vents

The choice of wooden air vents on the decoration of the style requirements are very high, the material is more special, the finished product is more texture, it is easy to improve the decor grade, but the production of special shapes of the price will be very high, the need for better painting process, to avoid cracking of the air vents, especially in the summer when the temperature is high, air conditioning out of the wind and the temperature difference between the indoor temperature is large, easy to deformation and cracking.

Wooden Air Vents

3.1 The Basic Concept of Air Flow Organization

3.1.1 Air Supply Jet

Air is blown out of the orifice and forms a stream of air in the space called a supply air jet.
Research content: Under the condition of a certain air outlet area, form and air outlet velocity, the changes of airflow velocity and temperature along the way are studied.
Purpose: According to the law of jet, the number and location of air supply outlets are reasonably arranged to ensure that the temperature, speed, cleanliness and other parameters of the air in the activity area or a specific area meet the requirements.

3.1.2 Return Air Confluence

In the indoor airflow field, the influence range of the return air outlet confluence is very small, and the main factor affecting the indoor airflow movement law and the distribution of indoor air parameters is the supply air jet.
According to the confluence law, the number and position of the return air outlet are reasonably arranged to match with the air supply outlet to ensure the uniformity and stability of the indoor air flow, and there is no “dead angle or short circuit” phenomenon.
 Therefore, it is of great significance to reasonably select the form and number of air supply outlets, as well as the layout location.

4.1 The Form of Spatial Airflow Distribution

forms of air flow distribution

4.1.1 Distribution of Upward Supply and Downward Return Airflow

Distribution of Upward Supply and Downward Return Airflow

 (a) Lateral Supply and Lateral Return

 (b) Diffuser air supply

  (c) Nozzle Outlet Air Supply Lateral Supply and Lateral Return

Feature: The workspace is a reflow zone.  The side feeding is attached to the ceiling in order to extend the jet distance.  It is suitable for spaces with limited spans and not too low heights, such as guest rooms and offices. It is a commonly used deflection grille. Diffuser Ceiling Air Supply

Feature: The working area is the return area, the return air can be down or up, and the diffuser can be sent horizontally, which can form a attached jet, which can not only meet the requirements of use but also be more beautiful for the air-conditioning area with low indoor height.
Commonly used tuyere: square/round diffuser (attached type). Nozzle Outlet Air Supply

Feature: Usually the same side of the return air, the activity area is in the return area, the outlet velocity of the nozzle is high, the airflow range is long, and the indoor air is strongly mixed, which can form a large return area indoors, and can meet the requirements of uniform airflow distribution by arranging a small number of tuyeres. It is suitable for tall spaces, such as theaters and stadiums.

4.2.1 Upward Supply and Upward Return

Send it Back and Forth

(a) Same-Side Supply and Return

(b) Opposite-Side Supply and Return

(c) Upward Return with Horiziontal Diffuser Air Supply

 Upper and lower flow diffuser

4.3.1 Downward Supply and Upward Return

Send it Back from the Bottom

 (a) Floor-Based Downward Air Distribution and Upward Return

 (b) Terminal Unit Downward Air Supply with Upward Return

 (c) Displacement Ventilation with Downward Air Supply and Upward Return

4.4.1 Mid-Level Supply

It can be used up and down return air or lower back (regardless of the upper space), which is suitable for tall spaces, such as tall courtyard and tall factories.


 (a) Bilateral middle air supply and bilateral lower return air

 (b) Middle air supply, lower return air, top exhaust air

4.5.1 Return Air Inlet and Return Air Form

Principle of return air inlet layout: It should be arranged in the return area, with little influence on the position and shape, and should not be arranged in the jet area to prevent short circuit. Where there is a concentrated load, the return air outlet should be arranged at the load place as much as possible

Organizational form of return air: air return through corridor; pipe return air; Ceiling return air (it is not recommended to bring dust into the air conditioning system to affect the indoor air quality

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