Installation of static pressure chamber KSD Arktos. Ceiling grilles and diffusers. Product area, sq. m

Purpose

Static pressure chambers are designed to ensure a uniform flow of air across the cross-section of the air distributors due to a sharp decrease in air speed in the chamber. Static pressure chambers are also used for ease of installation of diffusers.

Description

For ceiling diffusers APN, APR, 4APN-P, 4APR-P, 4APN-S, 4APR-S, static pressure chambers 3KSD, 3KSR are manufactured, the dimensions of which are determined by the average design air flow speed in them no more than 1.5 m/s, taking into account the recommended performance of diffusers, as well as the possibility of their placement in the ceiling space.

To regulate air flow, a regulating device is installed in the inlet pipe of the static pressure chamber 3KSR. For diffusers APR, 4APR-P, 4APR-S with a flow regulator, the use of 3KSR is inappropriate.

To improve the technical characteristics of the static pressure chambers, the inside can be covered with a layer of heat and sound insulating material. In this case, the overall dimensions of the static pressure chamber do not change. The insulating lining reduces noise by - 6 dB, reduces cold (heat) losses of the supply air and prevents the formation of condensation on the surface of the KSD at air temperatures below the dew point.

Kinds:

• 4APN+KSD - four-sided diffusers and KSD with lateral supply
• 4APN+KSD S - four-sided diffusers and KSD with end supply.
• ZAPN+KSD - three-way diffusers and KSD with lateral supply.
• 3APN+KSD S - three-way diffusers and KSD with end supply.
• 2APN+KSD - double-sided diffusers and KSD with lateral supply.
• 2APN+KSD S - double-sided diffusers and KSD with end supply.
• 2APNu+KSD - double-sided corner diffusers and KSD with side supply.
• 2APNu+KSD S - double-sided corner diffusers and KSD with end supply.
• 1APN+KSD - one-way diffusers and KSD with lateral supply.
• 1APN+KSD S - one-way diffusers and KSD with end supply.

The diffusers are attached to the chambers using self-tapping screws around the perimeter. The tightness of the connection between the KSD inlet pipe and the air duct is ensured by a rubber seal.

Installation of the static pressure chamber - ceiling. Fastening 3KSD, 3KSR to building structures is done using metal cables passed through the holes of the bent shelves of the chamber or using threaded rods (studs) and corner brackets. Fastening elements are not included in the delivery package. The false ceiling is installed after attaching 3KSD, 3 KSR.

When manufacturing products to order, 3KSD, 3KSR can be painted by powder coating in any color according to the RAL catalogue.

Specifications

Lattices

Ceiling grilles are part of the supply and exhaust ventilation and are most often installed in suspended ceilings in various rooms. The durable aluminum anemostat allows you to create “laying” air jets spreading in 4 directions.

Standard sizes of square diffusers:

Lattice 225x225 Lattice 675x675

Lattice 300x300 Lattice 750x750

Lattice 375x375 Lattice 825x825

Lattice 450x450 Lattice 900x900

Lattice 525x525 Lattice 975x975

Lattice 600x600 Lattice 1050x1050

Diffusers

Ceiling diffusers complete the ventilation system, providing air directly into the room and distributing it evenly. Another function of the diffuser is to control the speed and volume of air flow.

For questions regarding the selection of ceiling grilles and diffusers, please contact our company representatives. We will help you equip your air conditioning system to the highest standard.

Through the ceiling (diffuser 600x600) ventilation grille, operating as part of the air conditioning and ventilation system, fresh air is supplied to the premises. The design includes an anemostat that dissipates the flow in several directions. If used , you can prevent polluted air from entering the room from outside.

Square diffusers mounted on the ceiling evenly distribute the air inside the room and are the end of the ventilation system. In this case, the devices control the volume of incoming air and its speed.

The final elements of any ventilation system are grilles and diffusers, installed indoors and, less often, outdoors. The main function of these devices (let’s call it the “active mode” of operation) is to distribute the direction and regulate the power of air flows. Grilles and diffusers in passive operation mode are also used to remove air from the room. The devices perform not only the function of distributing and regulating air flow, but also a decorative one.

Features of diffusers and grilles.

At the moment, there are a large number of varieties of these devices. Diffusers and grilles have the following features and differences from each other:

• Specifications. Each diffuser and grille has indicators of air flow, noise level when air flows through the devices, pressure loss, and range of air jets.
• Design. Diffusers and grilles can have a wide variety of designs, depending on the type of which the air flow is distributed and regulated. There are, for example, devices that direct air in one, two, three or more directions. The multilateral design allows you to distribute the air flow evenly throughout the room, as well as set more or less ventilated areas. The devices can also have fans in their design, manual or automatic air flow direction regulators.
• Material of manufacture. Ventilation diffusers and grilles are often made of plastic. Such products are mainly used for installation in ceilings and walls. There are also metal structures. More durable devices are designed for installation on the floor, less durable ones (usually aluminum) are also used on walls and ceilings. There are also wooden diffusers and grilles on the market.
• Design. Diffusers and grilles can have a wide variety of designs. The geometric shape of the devices as a whole and their individual elements, color, etc. differ.

Differences between APN and APR diffusers.

The APN grille and APR grille presented in this section differ from each other in design features. The APR grille has a manual regulator in its design, which allows the user to set the direction of the air flow. The advantage of this design is the ability to set the desired level of ventilation for a particular area of ​​the room.

APN diffusers, in turn, can be considered more reliable and easy-to-use designs. The absence of regulators eliminates the possibility of device breakdown due to user negligence. In addition, APN diffusers are not afraid of their elements clogging with dirt. In the case of APR types, dirt can make it difficult to adjust the air direction.

Ceiling diffusers with static pressure chambers.

Diffusers with static pressure chambers provide: - uniform air flow across the cross section of the air distributors; - reduction of noise coming through the network to the air distributor; - ease of installation of air distributors on round air ducts.KSD is sometimes called -grill adapter.

Kinds:

• 4APN+KSD - four-sided diffusers and KSD with lateral supply
• 4APN+KSD S - four-sided diffusers and KSD with end supply.
• ZAPN+KSD - three-way diffusers and KSD with lateral supply.
• 3APN+KSD S - three-way diffusers and KSD with end supply.
• 2APN+KSD - double-sided diffusers and KSD with lateral supply.
• 2APN+KSD S - double-sided diffusers and KSD with end supply.
• 2APNu+KSD - double-sided corner diffusers and KSD with side supply.
• 2APNu+KSD S - double-sided corner diffusers and KSD with end supply.
• 1APN+KSD - one-way diffusers and KSD with lateral supply.
• 1APN+KSD S - one-way diffusers and KSD with end supply.

Ceiling diffusers 4APN, 3APN, 2APN, 2APNu, 1APN, 4APN-P, 4APN-S are manufactured with static pressure chambers 3KSD, 3KSR, the dimensions of which are determined by the average design air flow speed in them no more than 1.5 m/s, taking into account the recommended performance diffusers, as well as the possibility of their placement in the ceiling space. To regulate the air flow, the 3KSR static pressure chambers are equipped with a regulating device, which is installed in the inlet pipe.

Diffusers 4APR, 3APR, 2APR, 2APRu, 4APR-P, 4APR-S with a flow regulator are not recommended for use with static pressure chambers. This is due to the fact that the main resistance of the air distributor with a static pressure chamber is determined by the chamber itself, and the influence of the diffuser with the regulator is insignificant, so effective regulation in this case cannot be achieved. The static pressure chamber acts as a simple chamber muffler, reducing noise propagating through the ventilation network by 4-6 dB.

The plenum chambers can be covered from the inside with a layer of heat-insulating and sound-absorbing material. In this case, the overall dimensions of the static pressure chamber do not change. This lining enhances the effect of the chamber reducing the noise coming through the network to the air distributor by an additional 6-8 dB (mainly at high frequencies), and also reduces the loss of cold (heat) of the supply air and prevents the formation of condensation on the surface of the air distributor at a temperature air below the dew point. 3KSD, 3KSR are made of galvanized steel. 3KSD, 3KSR have a side air supply along the larger side of the diffuser or an end supply.

The diffusers are fastened to the chambers using self-tapping screws around the perimeter. The tightness of the connection between the inlet pipe 3KSD, 3KSR and the air duct is ensured by a rubber seal. Installation of the static pressure chamber - ceiling. Fastening 3KSD, 3KSR to building structures is done using metal cables passed through holes in the bent chamber shelves or using threaded rods (studs) and corner brackets. Fastening elements are not included in the delivery package. The false ceiling is installed after attaching 3KSD, 3KSR

Features of air distribution with static pressure chambers.

It is known that uniform velocity distribution over the entire cross-section of the air distributor can be guaranteed by air supply from the static pressure chamber (SPC). KSD, as a rule, is a metal box, which is connected to the main air duct or its branches using a round pipe of standard sizes. Additional leveling devices (fenders, dividers in the form of perforated sheets), as well as sound-absorbing material, can be installed inside the chamber. At the entrance to the VSD, the air speed decreases sharply, pulsating vortices are formed, which gradually disintegrate due to the fact that the dynamic pressure decreases to a minimum, and the static pressure, on the contrary, is restored to a value approximately equal to the full pressure. In some cases, this chamber is usually called a calming chamber, because the speed in it tends to 0, the flow stabilizes. The length at which the vortices gradually dissipate is 8÷12 equivalent chamber diameters. This determines the main dimensions of the device. To significantly reduce the length of the zone with vortex formation, it is advisable to install a fender in the CSD in the form of a perforated round plate with a small coefficient of open section (K l.s. ≈0.2). In addition, to level the velocity field impinging on the air distribution surface, the simplest and most effective method is to install a divider in the form of a perforated sheet at a certain distance from the BP. The action of this divider does not depend on the flow speed, but only on the coefficient of open section (Kl.s.) of the surface. The less K w.s. , the higher the degree of flow alignment along the front, but when a certain critical value of local resistance (ζ) is reached, an ejection zone appears behind the perforated surface, and this can lead to new unevenness. According to literary sources, the critical value is ζ = 2 and this corresponds to K l.s. =0.6. In addition, volumetric uniformity in the KSD can be achieved at a certain ratio of F to (cross-sectional area of ​​the KSD) to F p (supply pipe area): F to ≈ 10 . F Patr (lateral inlet), F to ≈ 6 . F fitting (end connection). An important factor influencing the uniformity of the flow is also the location of the divider relative to the supply pipe. Works by V.A. Bakhareva, I.E. Idelchika, V.N. Taliyev and other leading experts in this field helped us correctly calculate the CSDs and minimize their volumes for convenient installation in confined spaces. So, KSD were developed (Fig. 1, 2) with minimal dimensions and a side air supply, and, if necessary, with an end air supply. In order to reduce the noise generated by the fan and propagating through the air ducts towards its outflow, it was decided to line the inner surface of the fan with sound-absorbing material. The experimental studies carried out made it possible to identify the most effective material, establish its minimum thickness and specific density for sound absorption purposes, and take certain measures to eliminate the entrainment of fibers and microparticles of fabric with the supply air. These works were carried out under the guidance of Doctor of Technical Sciences. G.D. Izak. In particular, we suggest using material covered with fiberglass on one side. As tests have shown, KSDs lined with this sound-absorbing material have a fairly high acoustic efficiency in the frequency range from 250 to 8000 Hz. However, low-frequency noise levels from 50 to 250 Hz are less well captured by sound-absorbing material. According to Dr. Tech. Sciences G.D. Izak, this frequency range can be localized by installing so-called Helmholtz resonators (resonance panels with a certain perforation) in the CSD, configured to absorb low-frequency noise. A series of acoustic tests in this direction did not allow us to say unambiguously about the advisability of using resonant panels in the CSD, because the issue of price, material consumption, weight and labor costs for manufacturing the CSD in this version exceeded the effect of quality. However, the proposed idea was wisely used when equipping the CSD with a fender and a divider, the main purpose of which is to ensure the damping of vortices and stabilization of the velocity field throughout the chamber volume. We combined two tasks of reducing noise and ensuring uniform distribution of air parameters by using flow dividers in the form of perforated plates with holes Ø 5 mm, as recommended in Helmholtz resonators, but with a different perforation pitch. A comparison of the acoustic characteristics of air distribution products from the Arktos company, equipped with such static pressure chambers, indicates a clear advantage of 8-10 dB(A) compared to analogues under equal initial conditions at the outflow. The gain that we received in terms of noise indicators, in our opinion, lies, firstly, in the greater uniformity of the flow, which we achieved due to fenders and dividers, and secondly, due to the absorption effect of structures inside the chamber configured to dampen low-frequency noise . I would like to believe that we have hit the nail on the head, because when designing ventilation systems in those premises that have high noise requirements (hospitals, hotels, residential and public premises, theaters, concert halls, etc.), it is possible to use KSD with Arktos products with high air loads of ~ 40%. And if you use additional options for the KSD in the form of lining with sound-absorbing material and one-sided lamination, then the calculated productivity increases by 60%. It is possible that Arktos KSDs will cost slightly more than the simple KSD version, which does not provide for noise dampening measures, but good things are never cheap. Sometimes the Customer, in pursuit of the expected benefit, purchases less expensive equipment, but with worse aerodynamic performance and, as a result, higher noise characteristics, which sometimes requires the installation of noise suppressors. And then the benefit turns into additional costs. In a word, the motto of our production is to satisfy the needs of consumers with offers of high quality, reliable and wide range of climate control equipment. Conclusion on the CSD 1. A model range of KSD has been developed and supplied to order across the entire range of manufactured air distributors (grills, shades, diffusers, panels). 2. Horizontal or vertical installation of the KSD is proposed: behind a suspended ceiling, or on a wall, in some cases - in the work area. 3. The use of KSD significantly simplifies installation and subsequent maintenance, especially in hard-to-reach places. 4. Among the positive differences between the KSD produced by Arktos and their analogues is the lower level of generated noise under equal initial conditions for dimensions and air loads. And as a result, the ability to supply large volumes of air to rooms where strict requirements are put forward for the level of generated noise. Slotted grid with static pressure chamber (SPC) Modified air distribution panel (VPM) with a static pressure chamber Steel perforated panel (SPP) with plenum chamber Turbulizing cell air distribution panel (VPT) with a static pressure chamber

For more detailed information, please contact the sales department.

General information

Slotted grilles with static pressure chambers provide:
— uniform outflow of air flow across the cross-section of the air distributors;
— reduction of noise coming through the network to the air distributor;
— ease of installation of air distributors on round air ducts.

For grilles, static pressure chambers 2KSD M, 2KSR M are manufactured. To regulate air flow, static pressure chambers 2KSR M are equipped with a regulating device, which is installed in the inlet pipe.

For grilles, the use of 2KSR M is inappropriate, since the change in flow rate is carried out directly in the air distributor.

Plenum chamber acts as a simple chamber muffler, reducing noise propagating through the ventilation network by 4-6 dB.

The plenum chambers can be covered from the inside with a layer of heat-insulating and sound-absorbing material. In this case, the overall dimensions of the static pressure chamber do not change. This lining enhances the effect of the chamber reducing the noise coming through the network to the air distributor by an additional 6-8 dB (mainly at high frequencies), and also reduces the loss of cold (heat) of the supply air and prevents the formation of condensation on the surface of the air distributor when the air temperature is below the dew point .

2KSD M, 2KSR M are made of galvanized steel, with a lateral air supply on side A of the grille. Depending on the length of the air distributor, one or two inlet pipes are installed in the chamber.

Installation of 2KSD M, 2KSR M to building structures is carried out using metal cables or using threaded rods through mounting holes in the chamber. Fastening elements are not included in the delivery package. The suspended ceiling is installed after the cameras are installed.

Slotted grilles with static pressure chambers are a collapsible design in which the grilles are attached to the chambers using screws through metal corners installed in the grilles; the screws are screwed into threaded bushings mounted on the chamber bracket.

Slotted gratings with static pressure chambers are manufactured from sizes 500 mm to 2000 mm with a pitch of 50 mm. Also, all slotted grilles with static pressure chambers have the ability to be mounted in one line; joining is carried out through holes in the brackets for joining on the chambers with a bolted connection (fasteners are not included in the delivery package).

If there are special requirements for the selection of grilles with chambers for installation in one line, approval of the sketch is necessary. When ordering slotted grilles with static pressure chambers with a non-standard height “C” and (or) a non-standard diameter “D” of the connecting pipe, approval of the sketch is also required.

Data for equipment selection

Notation system

Notation system

An example of designation when ordering a 2-slot APC grille, 9 m long, with two sidewalls, white RAL9016, with a static pressure chamber without a control device, without heat and sound insulation:

2 ARS 9000 + B + 2KSD M

Slotted gratings with chambers 2 KSD M with a length of more than 2000 mm are made from a set of slotted gratings with chambers 2 KSD M from 500 mm to 1000 mm with a pitch of 50 mm. The selection of cameras with grilles is carried out as follows:

• if the total length is a multiple of 1000 mm, then the number of chambers with bars N = total length A / 1000.
• if the total length is not a multiple of 1000 mm, the number of chambers with bars N = total length A / 1000 is taken as an integer + 1.

In the case when the total length is not a multiple of 1000 mm, the division is carried out into N gratings with chambers, with A being the total length, where N-1 identical gratings with chambers from 500 mm to 1000 mm and one grating with a chamber differing up or down from the rest in the range from 500 mm to 1000 mm.

Example. When ordering 5 ABC 9050 + 2KSD M are manufactured:

N = 9050/1000 = 9 + 1 = 10 chambers with bars.

5 ABC 900 + 2 KSD M - 9 pcs;

5 ABC 950 + 2 KSD M - 1 piece;

Example. When ordering 2 ARS 12550 + B + 2KSD M are manufactured:

N = 12550/1000 = 12 + 1 = 13 chambers with bars.

2 ARS 1000 + 2 KSD M - 10 pcs;

2 ARS 1000 + 1B + 2 KSD M - 2 pcs;

2 ARS 550 + 2 KSD M - 1 piece;